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Patterson, Eric E., Sujeewa C. Piyankarage, Kyaw ThetMaw Myasein, Jose S. Pulido, Robert F. Dundervill, R. Mark Hatfield i Scott A. Shippy. "A high-efficiency sample introduction system for capillary electrophoresis analysis of amino acids from dynamic samples and static dialyzed human vitreous samples". Analytical and Bioanalytical Chemistry 392, nr 3 (12.08.2008): 409–16. http://dx.doi.org/10.1007/s00216-008-2304-5.
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MIYASHITA, Shin-ichi, Shin-ichiro FUJII i Kazumi INAGAKI. "Single-particle/Cell Analysis by Highly Time-resolved ICP-MS Using a High-efficiency Sample Introduction System". Bunseki kagaku 66, nr 9 (2017): 663–76. http://dx.doi.org/10.2116/bunsekikagaku.66.663.
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Aliaga-Campuzano, M. P., J. P. Bernal, S. B. Briceño-Prieto, O. Pérez-Arvizu i E. Lounejeva. "Direct analysis of lanthanides by ICPMS in calcium-rich water samples using a modular high-efficiency sample introduction system–membrane desolvator". Journal of Analytical Atomic Spectrometry 28, nr 7 (2013): 1102. http://dx.doi.org/10.1039/c3ja50070e.
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Kreisberg, N. M., D. R. Worton, Y. Zhao, G. Isaacman, A. H. Goldstein i S. V. Hering. "Development of an automated high-temperature valveless injection system for online gas chromatography". Atmospheric Measurement Techniques 7, nr 12 (12.12.2014): 4431–44. http://dx.doi.org/10.5194/amt-7-4431-2014.
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Abstract. A reliable method of sample introduction is presented for online gas chromatography with a special application to in situ field portable atmospheric sampling instruments. A traditional multi-port valve is replaced with a valveless sample introduction interface that offers the advantage of long-term reliability and stable sample transfer efficiency. An engineering design model is presented and tested that allows customizing this pressure-switching-based device for other applications. Flow model accuracy is within measurement accuracy (1%) when parameters are tuned for an ambient-pressure detector and 15% accurate when applied to a vacuum-based detector. Laboratory comparisons made between the two methods of sample introduction using a thermal desorption aerosol gas chromatograph (TAG) show that the new interface has approximately 3 times greater reproducibility maintained over the equivalent of a week of continuous sampling. Field performance results for two versions of the valveless interface used in the in situ instrument demonstrate typically less than 2% week−1 response trending and a zero failure rate during field deployments ranging up to 4 weeks of continuous sampling. Extension of the valveless interface to dual collection cells is presented with less than 3% cell-to-cell carryover.
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Kreisberg, N. M., D. R. Worton, Y. Zhao, G. Isaacman, A. H. Goldstein i S. V. Hering. "Development of an automated high temperature valveless injection system for on-line gas chromatography". Atmospheric Measurement Techniques Discussions 7, nr 7 (23.07.2014): 7531–67. http://dx.doi.org/10.5194/amtd-7-7531-2014.
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Abstract. A reliable method of sample introduction is presented for on-line gas chromatography with a special application to in-situ field portable atmospheric sampling instruments. A traditional multi-port valve is replaced with a controlled pressure switching device that offers the advantage of long term reliability and stable sample transfer efficiency. An engineering design model is presented and tested that allows customizing the interface for other applications. Flow model accuracy is within measurement accuracy (1%) when parameters are tuned for an ambient detector and 15% accurate when applied to a vacuum based detector. Laboratory comparisons made between the two methods of sample introduction using a thermal desorption aerosol gas chromatograph (TAG) show approximately three times greater reproducibility maintained over the equivalent of a week of continuous sampling. Field performance results for two versions of the valveless interface used in the in-situ instrument demonstrate minimal trending and a zero failure rate during field deployments ranging up to four weeks of continuous sampling. Extension of the VLI to dual collection cells is presented with less than 3% cell-to-cell carry-over.
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Kajner, Gyula, Ádám Bélteki, Martin Cseh, Zsolt Geretovszky, Tibor Ajtai, Lilla Barna, Mária A. Deli, Bernadett Pap, Gergely Maróti i Gábor Galbács. "Design, Optimization, and Application of a 3D-Printed Polymer Sample Introduction System for the ICP-MS Analysis of Nanoparticles and Cells". Nanomaterials 13, nr 23 (25.11.2023): 3018. http://dx.doi.org/10.3390/nano13233018.
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Commonly used sample introduction systems for inductively coupled plasma mass spectrometry (ICP-MS) are generally not well-suited for single particle ICP-MS (spICP-MS) applications due to their high sample requirements and low efficiency. In this study, the first completely 3D-printed, polymer SIS was developed to facilitate spICP-MS analysis. The system is based on a microconcentric pneumatic nebulizer and a single-pass spray chamber with an additional sheath gas flow to further facilitate the transport of larger droplets or particles. The geometry of the system was optimized using numerical simulations. Its aerosol characteristics and operational conditions were studied via optical particle counting and a course of spICP-MS measurements, involving nanodispersions and cell suspensions. In a comparison of the performance of the new and the standard (quartz microconcentric nebulizer plus a double-pass spray chamber) systems, it was found that the new sample introduction system has four times higher particle detection efficiency, significantly better signal-to-noise ratio, provides ca. 20% lower size detection limit, and allows an extension of the upper limit of transportable particle diameters to about 25 µm.
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Dvoryanchikova, Е. M., К. A. Dzhevello i D. D. Galuzin. "Experience in using high matrix introduction (HMI) technology for the analysis of lead by inductively coupled plasma mass-spectrometry (ICP-MS)". Industrial laboratory. Diagnostics of materials 87, nr 7 (24.07.2021): 17–22. http://dx.doi.org/10.26896/1028-6861-2021-87-7-17-22.
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The impurities contained in lead and lead-based alloys, which are widely used in various branches of industry, i.e., nuclear, medical, electrical engineering, etc., affect their physicochemical properties which necessitates developing of the reliable method for the impurity determination. Photometric, spectral, and chemical — spectral methods used to address this problem are labor-intensive and do not always have the required sensitivity. A method of inductively coupled plasma mass spectrometry (ICP-MS) coupled with High Matrix Introduction (HMI) technology has been proposed as alternative easy to use procedure designed to be more sensitive. The Agilent HMI Sample Injection System provides inline dilution of the sample aerosol (supplied from the spray chamber to the burner) with pure argon. This method of sample introduction provides for analysis of the solutions with a solute content of up to 1% and higher. The aerosol dilution reduces concentration of the matrix and solvent at the inductively coupled plasma interface without conventional dilution. In this case, the matrix suppression of impurities is almost eliminated and CeO+/Ce+ is reduced to 0.2%, while the typical CeO+/Ce+ ratio for the Agilent 7500 mass spectrometers is 1 – 2%, but no more than 3%. We present application of this method to the analysis of Mg, Ca, Fe, Cu, As, Ag, Sn, Sb, Bi in lead by an Agilent 7500cx ICP-MS with preliminary acid digestion of lead samples in a microwave autoclave. The use of the HMI system made it possible to exclude the stage of sample dilution, reducing the possibility of sample contamination with a diluent, and to determine the content of impurities in a highly concentrated matrix at a level of 10–4 – 10–5 %. The efficiency of the method, as well as the possibility of using multi-element standard solutions prepared with 1% nitric acid for analysis of the samples with high lead content is shown.
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Zheng, Jian, Liguo Cao, Keiko Tagami i Shigeo Uchida. "Triple-Quadrupole Inductively Coupled Plasma-Mass Spectrometry with a High-Efficiency Sample Introduction System for Ultratrace Determination of 135Cs and 137Cs in Environmental Samples at Femtogram Levels". Analytical Chemistry 88, nr 17 (19.08.2016): 8772–79. http://dx.doi.org/10.1021/acs.analchem.6b02150.
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Todolí, José-Luis, i Jean-Michel Mermet. "Evaluation of a direct injection high-efficiency nebulizer (DIHEN) by comparison with a high-efficiency nebulizer (HEN) coupled to a cyclonic spray chamber as a liquid sample introduction system for ICP-AES". J. Anal. At. Spectrom. 16, nr 5 (2001): 514–20. http://dx.doi.org/10.1039/b009430g.
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Manard, Benjamin T., Veronica C. Bradley, C. Derrick Quarles, Lyndsey Hendriks, Daniel R. Dunlap, Cole R. Hexel, Patrick Sullivan i Hunter B. Andrews. "Towards Automated and High-Throughput Quantitative Sizing and Isotopic Analysis of Nanoparticles via Single Particle-ICP-TOF-MS". Nanomaterials 13, nr 8 (9.04.2023): 1322. http://dx.doi.org/10.3390/nano13081322.
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The work described herein assesses the ability to characterize gold nanoparticles (Au NPs) of 50 and 100 nm, as well as 60 nm silver shelled gold core nanospheres (Au/Ag NPs), for their mass, respective size, and isotopic composition in an automated and unattended fashion. Here, an innovative autosampler was employed to mix and transport the blanks, standards, and samples into a high-efficiency single particle (SP) introduction system for subsequent analysis by inductively coupled plasma–time of flight–mass spectrometry (ICP-TOF-MS). Optimized NP transport efficiency into the ICP-TOF-MS was determined to be >80%. This combination, SP-ICP-TOF-MS, allowed for high-throughput sample analysis. Specifically, 50 total samples (including blanks/standards) were analyzed over 8 h, to provide an accurate characterization of the NPs. This methodology was implemented over the course of 5 days to assess its long-term reproducibility. Impressively, the in-run and day-to-day variation of sample transport is assessed to be 3.54 and 9.52% relative standard deviation (%RSD), respectively. The determination of Au NP size and concentration was of <5% relative difference from the certified values over these time periods. Isotopic characterization of the 107Ag/109Ag particles (n = 132,630) over the course of the measurements was determined to be 1.0788 ± 0.0030 with high accuracy (0.23% relative difference) when compared to the multi-collector–ICP-MS determination.
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Jitaru, Petru, Marco Roman, Giulio Cozzi, Paola Fisicaro, Paolo Cescon i Carlo Barbante. "Speciation analysis of selenoproteins in human serum by microbore affinity-HPLC hyphenated to ICP-Sector field-MS using a high efficiency sample introduction system". Microchimica Acta 166, nr 3-4 (15.08.2009): 319–27. http://dx.doi.org/10.1007/s00604-009-0208-5.
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Miyashita, Shin-ichi, Hiroaki Mitsuhashi, Shin-ichiro Fujii, Akiko Takatsu, Kazumi Inagaki i Toshiyuki Fujimoto. "High transport efficiency of nanoparticles through a total-consumption sample introduction system and its beneficial application for particle size evaluation in single-particle ICP-MS". Analytical and Bioanalytical Chemistry 409, nr 6 (2.12.2016): 1531–45. http://dx.doi.org/10.1007/s00216-016-0089-5.
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Zheng, Jian, i Masatoshi Yamada. "Inductively coupled plasma-sector field mass spectrometry with a high-efficiency sample introduction system for the determination of Pu isotopes in settling particles at femtogram levels". Talanta 69, nr 5 (15.07.2006): 1246–53. http://dx.doi.org/10.1016/j.talanta.2005.12.047.
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Ivanets, M., V. Kutsenko, A. Artikula, O. Shinkarenko i I. Yachna. "MANAGEMENT ALGORITHM FOR THE COMPREHENSIVE SYSTEM OF TESTING SAMPLES OF ANTI-AIRCRAFT MISSILE SYSTEMS". Випробування та сертифікація, nr 1(1) (12.09.2023): 17–24. http://dx.doi.org/10.37701/ts.01.2023.02.
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Combat capability characterizes the ability of a military unit or unit to perform its assigned tasks. The combat capability of the modern army is based on the degree of staffing with modern types of weapons and military equipment, their technical level and combat capabilities. The main requirement for weapons samples is high efficiency in the performance of combat missions. Quality control of weapons samples requires the performance of the necessary number of comparative studies, including when conducting different levels of testing.
Testing is the main way of confirming the given tactical and technical characteristics of weapons samples and their constituent parts. The main way to assess the characteristics of the intended use of weapons is to conduct the necessary number of field experiments. It is not always possible to conduct live experiments due to various reasons of an objective nature in the conditions of hostilities, or large material costs or the impossibility of ensuring the safety of conducting experimental work.
An analysis of the introduction features of a complex system of testing samples of the anti-aircraft missile complex which involves replacing part of the live tests with its simulation using semi-live or mathematical modeling stands has been carried out.
A control algorithm is proposed that implements an integrated test system of samples of anti-aircraft missile systems and provides for the following procedures: collection and processing of the requirements of the tactical and technical (technical) task for the development of a weapons prototype, analysis of requirements for the tactical and technical characteristics of the sample; summarizing the tactical and technical characteristics of the prototype of the complex which are subject to verification and confirmation by conducting tests; determination of the tactical and technical characteristics of the intended purpose of the complex, the verification of which requires conducting full- scale experiments; determination of the tactical and technical characteristics of the intended purpose of the complex which can be verified by conducting semi-realistic, mathematical and computer simulation modeling; analysis of complete coverage of all significant tactical and technical characteristics of the complex; formation of a decision regarding the organization of tests of an anti-aircraft missile complex sample; analysis of the effectiveness of the tests and correction of the solution.
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Krachler, Michael, James Zheng, David Fisher i William Shotyk. "Direct Determination of Lead Isotopes (206Pb,207Pb,208Pb) in Arctic Ice Samples at Picogram per Gram Levels Using Inductively Coupled Plasma-Sector Field MS Coupled with a High-Efficiency Sample Introduction System". Analytical Chemistry 76, nr 18 (wrzesień 2004): 5510–17. http://dx.doi.org/10.1021/ac0496190.
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D’Ilio, S., N. Violante, M. Di Gregorio, O. Senofonte i F. Petrucci. "Simultaneous quantification of 17 trace elements in blood by dynamic reaction cell inductively coupled plasma mass spectrometry (DRC-ICP-MS) equipped with a high-efficiency sample introduction system". Analytica Chimica Acta 579, nr 2 (październik 2006): 202–8. http://dx.doi.org/10.1016/j.aca.2006.07.027.
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Lovell, Edmund, Kelly Morrison, Andre M. Pereira, David Caplin, Oliver Gutfleisch i Lesley F. Cohen. "Scanning Hall Probe Imaging of LaFe13-xSix". Advances in Science and Technology 93 (październik 2014): 219–24. http://dx.doi.org/10.4028/www.scientific.net/ast.93.219.
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Magnetocaloric materials with a Curie temperature near room temperature are of interest for application in high-efficiency solid state cooling. There are several promising families of materials including the LaFe13-xSix system which offers large magnetocaloric entropy change, low magnetic and thermal hysteresis, and tunability of the metamagnetic transition by introduction of interstitial hydrogen or partial substitution on the La or Fe sites. There is a large amount of literature on the properties and mechanism of the magnetocaloric effect in this material system, and more recently our group and several other groups have discussed the origins of the dynamics of the metamagnetic transition and its relation to magnetic hysteresis. Nevertheless, although extremely informative in other systems, there has been little spatially resolved information concerning the nature of the magnetic transition in this system. Here we use scanning Hall probe imaging to study LaFe13-xSix polycrystalline samples with x=1.2 prepared by induction melting to resolved the local static and dynamic magnetic properties. We find that the local properties of the magnetic transition are governed by chemical inhomogeneity rather that demagnetization effects associated with sample geometry.
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Ruggeri, Bruna Furer Ferri, Silvia Maria Voci, Camila Aparecida Borges i Betzabeth Slater. "Assessment of the usability of a nutritional epidemiology computerized system". Revista Brasileira de Epidemiologia 16, nr 4 (grudzień 2013): 966–75. http://dx.doi.org/10.1590/s1415-790x2013000400016.
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INTRODUCTION: Epidemiological research has been adhering to new technologies, such as computer systems, and using the Internet as a tool. Usability is a characteristic of a specific product concerning the facility to use it, its speed and the facility to learn how to use it. It should also not present errors, or these must be easy to solve, in case they occur, thus providing high satisfaction to users. OBJECTIVE: To evaluate the usability of the "System of health and nutrition monitoring - nutrition of school children" (NUTRISIM). METHODS: A sample of 17 Information Technology professionals evaluated the system and answered the "Questionnaire for System Usability", which determines the level of usability of systems by the Fuzzy Logic. The questionnaire contains 30 questions, which are divided into six metrics. The usability of the system determines six usability criteria in a large Fuzzy scale. RESULTS: With the exception of the metric "error control", all metrics were analyzed as "very good". The metrics "error control", "efficiency" and "satisfaction" presented medium amplitude, which is a better result in relation to the metrics "easy to learn", "easy to remember" and "effectiveness", which was assessed as "high". CONCLUSION: The study showed that the system is easy to be learned and used, but the answers are scattered. The instrument proved to be a useful tool to monitor and evaluate health and dietary intake in epidemiologic studies.
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Binh, Nguyen Vu, Nguyen Van Du, Nayoung Lee, Minji Kang, So Hyeon Ryu, Munhwi Lee, Deokcheol Seo i in. "Investigation of the Effect of Double-Filler Atoms on the Thermoelectric Properties of Ce-YbCo4Sb12". Materials 16, nr 10 (18.05.2023): 3819. http://dx.doi.org/10.3390/ma16103819.
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Skutterudite compounds have been studied as potential thermoelectric materials due to their high thermoelectric efficiency, which makes them attractive candidates for applications in thermoelectric power generation. In this study, the effects of double-filling on the thermoelectric properties of the CexYb0.2−xCo4Sb12 skutterudite material system were investigated through the process of melt spinning and spark plasma sintering (SPS). By replacing Yb with Ce, the carrier concentration was compensated for by the extra electron from Ce donors, leading to optimized electrical conductivity, Seebeck coefficient, and power factor of the CexYb0.2−xCo4Sb12 system. However, at high temperatures, the power factor showed a downturn due to bipolar conduction in the intrinsic conduction regime. The lattice thermal conductivity of the CexYb0.2−xCo4Sb12 skutterudite system was clearly suppressed in the range between 0.025 and 0.1 for Ce content, due to the introduction of the dual phonon scattering center from Ce and Yb fillers. The highest ZT value of 1.15 at 750 K was achieved for the Ce0.05Yb0.15Co4Sb12 sample. The thermoelectric properties could be further improved by controlling the secondary phase formation of CoSb2 in this double-filled skutterudite system.
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Sitorus, Samsider. "Pregnancy Examination (Antenatal Care) on the Prevention of High-Risk Pregnancy Events Accelerated the Referral System Efforts to Avoid Maternal Death in Dairi Regency North Sumatra, Indonesia". Global Journal of Health Science 15, nr 6 (29.05.2023): 10. http://dx.doi.org/10.5539/gjhs.v15n6p10.
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Introduction: The pregnancy screening websites evaluated in this study were accessed through various hardware devices, including personal computers (PCs), laptops, notebooks, and smartphones. Among various hardware options, researchers have chosen smartphones as a suitable container due to their widespread use, portability, space efficiency, effectiveness, efficiency, affordability, and practicality. Smartphones for some people, are phones that work using all operating system software that provides standard and fundamental relationships for application developers. In addition, smartphones are designed to work through an operating system, which allows users to freely add applications, functions, or make changes as desired, much like a computer. This includes the ability to operate a website.
Methods: This study was a case-control study. The sample included 60 pregnant women, with 30 having high-risk pregnancies and 30 having normal pregnancies. The analyses used are univariate and bivariate. Bivariate analysis employs the chi-square statistical test with a confidence level of 95%. Multivariate analysis using multiple logistic regression.
Results: The results indicate that knowledge, attitudes, actions, family income, support from family and posyandu cadres have an impact on the prevention of high-risk pregnancy events. Among these factors, family support was found to be the most influential. However, the study also revealed that efforts to prevent high-risk pregnancy events through pregnancy examination (antenatal care) have not been fully optimized.
Conclusion: The study concludes that arranging the order of pregnancies can prevent high-risk pregnancies in Dairi Regency. It is recommended that the government and related parties improve the implementation and supervision of pregnancy care to prevent high-risk pregnancies. This will ensure that the referral system operates effectively, ultimately reducing the incidence of maternal death.
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Leontiev, Aleksandr. "Physical modeling of a skip pneumatic winder". Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, nr 4 (25.06.2021): 64–73. http://dx.doi.org/10.21440/0536-1028-2021-4-64-73.
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Introduction. The analytical phase of research on mine skip pneumatic winders has been passed, so the theoretical provisions have to be tested by the methods of physical modeling which is aimed at confirming the mathematical model adequacy and assessing the effectiveness of different types of sealing devices. Research methods. Physical modeling phases have been formulated, including modeling by geometric and aerodynamic similarity criteria, constructing aerodynamic characteristics of the installation, carrying out experiments with non-contacting and combined seals, and calculating the values of the installation volumetric efficiency based on the experimental data obtained. Research results. The lifting time of the skip model with different masses of material and seal types has been determined. The installation working points in the “flow rate–pressure” coordinate system have been identified, and the values of the volumetric efficiency have been calculated for each working point. Analysis of the results. A satisfactory convergence of calculated and experimental parameters of the physical model has been established. The model's volumetric efficiency has reached a technically acceptable level. The expected value of the experimental model’s volumetric efficiency has been calculated according to the similarity constants. Conclusions. The model's study revealed the convergence of the experimentally obtained volumetric efficiency of the model with its calculated values and proved the applicability of the mathematical model to experimental sample parameters calculation. The volumetric efficiency of the installation with both non-contacting and combined seals is quite high allowing to recommend the studied sealing devices for mine pneumatic winders.
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Skopin, A. Yu, T. V. Gololobova, Elena A. Matveeva i A. O. Ivanova. "IMPROVEMENT OF METHODIC APPROACHES TO THE EVALUATION OF DISINFECTING EQUIPMENT EFFICIENCY IN THE SYSTEM OF QUALITY AND SAFETY ASSURANCE FOR ENDOSCOPIC INTERVENTIONS". Hygiene and sanitation 98, nr 12 (15.12.2019): 1444–50. http://dx.doi.org/10.18821/0016-9900-2019-98-12-1444-1450.
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Introduction. Low quality of endoscope treatment is one of the main risk factors for HAI during endoscopic manipulations. Special equipment is widely used to increase quality and safety of healthcare during the treatment of flexible endoscope. However, to confirm the efficiency of such equipment it is necessary to carry out laboratory experimental studies. Material and methods. A prototype model of domestically developed Device intended for carrying out the stages of final cleaning and high-level disinfection (HLD) of flexible endoscopes was used during research, utilizing the samples of agents with various active ingredients. Flexible endoscopes were used as testing devices. Donor blood was utilized for imitation of organic contamination. Mycobacterium terrae test microorganism culture was used for artificial contamination of testing devices. Results. As a result of studying the efficiency of final cleaning and HLD of flexible endoscopes in the Device after them being used once, negative azopyram samples were identified in all endoscope swabs; also, no growth of test microorganism was registered. During the studies of HLD efficiency in case of multiple use of functional solutions treatment efficiency was registered for 6-8 cycles. After the 12th treatment cycle characteristic growth of test microorganism is observed in the swabs. Efficiency of endoscopes’ decontamination in case of multiple use of a disinfectant based on peroxyacetic acid was confirmed during a work shift after 8 cycles; the decrease of disinfecting agent (DA) concentration by more than 10 times was registered during the shelf life of the functional solution on day 5. Conclusions. Studies indicate the necessity to research the efficiency of devices’ use to determine the conditions ensuring efficiency and safety of healthcare during endoscopic interventions.
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Valencia Carlo, Yarmila Elena, Guillermina Natera Rey i Alejandro Jiménez Genchi. "Psychometric properties of the Diurnal Insomnia Symptoms Response Scale (DISRS) in a Mexican population sample APPENDIX". Salud mental 46, nr 1 (27.01.2023): 1–10. http://dx.doi.org/10.17711/sm.0185-3325.2023.001.
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Introduction. Increased rumination is associated with longer night-time sleep onset latency and poorer sleep quality and efficiency in people with insomnia symptoms. Objective. To validate the Diurnal Insomnia Symptoms Response Scale (DISRS) in a general population sample. Method. 102 participants (women = 67 and men = 35) comprising patients and relatives who attended an outpatient consultation at a health center in Mexico City were evaluated. The English-Spanish-English translation system was used by two Spanish-speaking experts on the subject, an independent bilingual expert translated the new version of the scale into English, which was then compared with the original. The following self-administered questionnaires were used to evaluate the convergent, discriminant validity of this tool: the Ruminative Response Scale (RRS), the Insomnia Severity Index (ISI), and Penn State Worry Questionnaire (PSWQ). Results. The internal consistency of the scale items was α = .93. Principal components factor analysis yielded three factors with an eigenvalue of greater than one, which together explain 59.5% of the variance. Correlations between the total DISRS score and the cognitive-motivational dimensions (r = .938, p () .01), negative state (r = .898, p () .01) and tiredness (r = .853, p () .01) were statistically significant. Insomnia symptoms (SCC = .89) outweighed worries (SCC = .33) and ruminant responses (SCC = .33) when discriminating between cases with low and high levels of rumination associated with insomnia symptoms. Discussion and conclusion. Our results suggest that the DISRS scale has adequate psychometric properties that make it valid and reliable for use with the Mexican population.
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Malikov, Vladimir, i Alexey Ishkov. "Ultra-miniature eddy-current converter for small defects of deep occurrence search in the area of high-yield-stress steels weld joints". E3S Web of Conferences 281 (2021): 07004. http://dx.doi.org/10.1051/e3sconf/202128107004.
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The presented study describes a diagram of an eddy-current measuring system built on the basis of a subminiature eddy-current converter, intended for the conducting materials’ study. The article describes the results of testing a designed measuring system for defects search in 6XB2S steel samples, connected by a weld joint. The technology for creating such materials permits the significant impact resistance of finished products and provides an optimal combination of hardness and toughness. However, the defects formed in the material near the weld joint become a serious problem in the operation of such materials. In this study, an assessment of the possibility of searching for model defects hidden by a weld in two steel plates was made. The defects had different linear dimensions (0.3 - 0.9 mm) and occurred at different depths (1 - 2 mm). The developed system showed high efficiency of scanning and searching for defects with linear dimensions up to 0.9 mm. The search for smaller defects required a significant modernization of the developed measuring system - the introduction of a second eddy-current converter. The article presents the data confirming the feasibility of this change in the measuring system and the possibility of using a measuring system with two eddy current converters to search for small defects occurring at a considerable depth.
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Slonov, Azamat L., Azamat A. Zhansitov, Diana M. Khakulova, Zh I. Kurdanova, Ismel V. Musov i S. Yu Khashirova. "Development of Composite Materials for 3d Printing on the Basis of Polyphenylenesulfone". Materials Science Forum 935 (październik 2018): 15–20. http://dx.doi.org/10.4028/www.scientific.net/msf.935.15.
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The influence of talc and various polymeric additives on the basic mechanical properties of polyphenylenesulfone was investigated. It was found out that with the increase in the filler concentration there is an increase in stiffness, tensile strength and a decrease in the plasticity of the polyphenylenesulfone. While studying of polymer-polymer composites based on polyphenylenesulfone, high efficiency of polycarbonate as a modifier of impact strength was revealed. An effective method for producing a composite with a high impact strength and a modulus of elasticity has beendeveloped; it is based on the features of the distribution of the filler in the binary system polyphenylenesulfone – polycarbonate. The concentration of the filler in the polycarbonate phaseleads to low values of impactstrength, while its concentration in the phase of polyphenylenesulfone, followed by the introduction of polycarbonate leads to the formation of a high impact and high modulus composite. The samples obtained by 3D printing have high mechanical characteristics.
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Zhang, Donghui, Lili Sun, Jijin Mao, Qinhui Lei, Daifen Chen i Alexey P. Levtsev. "Flow Boiling Heat Transfer of Grooved Copper Foam with Open Gap". Engineering Technologies and Systems 32, nr 3 (30.09.2022): 423–36. http://dx.doi.org/10.15507/2658-4123.032.202203.423-436.
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Introduction. Copper foam material has various advantages. It has been proved effective in enhanced boiling heat transfer, but also increases pump power consumption. Grooved copper foam is a solution to achieve good balance between boiling heat transfer characteristics and pump power consumption. Material and Methods. Grooveless and grooved copper foam in open space was studied. Copper foam specifications comprised the combination of porosities of 70, 80 and 90%, and pore densities of 90 and 110 PPI. The grooved copper foams have two specifications: 11 and 17 grooves. The corresponding rib widths are 2 and 1 mm, with groove depth 2.9 mm and width 0.6 mm. The flow boiling experimental system of copper foam sample includes four parts: a heating water reservoir, pump, a test section, and a data acquisition system. In the test section, liquid water turns into vapor and carries the heat away from a copper block surface, and then vapor condenses into liquid water in the terminal reservoir. Results. Grooved copper foam samples presented significantly higher efficiency than grooveless ones. Grooved copper foams can increase the critical heat flux and heat transfer coefficient, compared with grooveless ones. Seventeen-grooved samples showed more excellent performance than 11-grooved ones. Visual observation disclosed that the stratified flow pattern dominated in moderate and high heat flux for grooved copper foam with open space. Covering vapor mass was more effective to be formed above 17-grooved samples, compared with 11-grooved ones. It indicated more vigorous boiling behavior occurs in 17-grooved sample. Discussion and Conclusion. The number of grooves has a significant impact on boiling heat transfer. Grooved copper foam samples present a significantly higher critical heat flux and heat transfer coefficient. Structural parameters such as porosity and pore density, play a relatively secondly role in heat transfer argumentation. Visual observation shows there exists a cyclic alternation of flow patterns: bubbly flow, annular flow and mass vapor formation for grooved samples. Forming vapor mass is more effective to be formed in 17-grooved samples, compared to 11-grooved ones. It indicates more vigorous boiling behavior occurs in 17-grooved samples.
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Solehudin, S. R., A. I. Ardian, R. D. Martina, W. Budhijanto i L. Marbelia. "Application of Attached Growth System for Laundry Wastewater Treatment". IOP Conference Series: Earth and Environmental Science 1275, nr 1 (1.11.2023): 012034. http://dx.doi.org/10.1088/1755-1315/1275/1/012034.
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Abstract Laundry wastewater can be treated in a small-scale aerobic wastewater treatment (WWT) system utilizing a microbubble generator (MBG). However, removing pollutants, precisely chemical oxygen demand (COD), is often low, especially under high wastewater load conditions. This study aims to improve the WWT system’s performance by incorporating an attached growth system. The research was conducted in a small-scale WWT system with a volume of 832 L in Cokrodiningratan, Code Riverbank, Yogyakarta, treating real wastewater from a nearby laundry shop. Experiments were performed batch-wise for one week with suspended and nylon-fabric-attached growth systems. Wastewater samples from the WWT system were taken and analyzed for COD concentrations. Results indicate that the attached growth system outperforms the suspended growth system. During operation, the suspended growth system achieved a COD removal rate of approximately 78% (temperature range of 26-28°C, a pH level of 6.3-7.1, and influent COD: 377.5 mg/L). In contrast, with the introduction of attachment media under similar batch operation conditions (temperature range: 26-28°C, pH level: 6.4-7.4, influent COD: 755.5 mg/L), the COD removal efficiency increased to 94%. The incorporation of attachment media led to a notably stable performance outcome.
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Gurbanov, Abdulaga, Ijabika Sardarova, Javida Damirova i Zarifa Mahmudova. "Development of a new technology for the fight against wax deposits". EUREKA: Physics and Engineering, nr 4 (27.07.2023): 3–9. http://dx.doi.org/10.21303/2461-4262.2023.003023.
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One of the most serious complications in the production, transport and treatment of oil is asphaltene-resin-paraffin deposits. Their formation in underground well equipment, as well as in flow lines, collection system pipelines increase the cost of oil production. There are no sufficiently effective reagents to solve these problems. The results of implementation in many other wells testify to the high efficiency of the new reagent. The effect of reagents on the rheological properties of oil was also studied. Sangachal Deniz oil was used as a crude oil sample. We have developed multicomponent and multifunctional reagents M-R, P-R. In addition, due to paraffin formations in the tubing, they had to change 50–60 pipes for new ones every month. As a result of the introduction of M-R reagents, no paraffin deposits were found in the tubing for almost a year The effect of these reagents on the pour point of oils, dispersion, dissolution, and paraffin deposition has been studied. The use of the new reagent was tested at the mines of the oil and gas production department (OGPD) "28 May". The results of implementation in many other wells testify to the high efficiency of the new reagent. The effect of reagents on the rheological properties of oil was also studied. Sangachal Deniz oil was used as a crude oil sample.
The proposed three-parameter Herschel-Bulkley model can be used to assess the rheological parameters of oils during their transportation. This layer, of course, cannot thicken indefinitely. Highly effective multicomponent composite compositions were developed to combat complications in the production of high-asphaltene-resin-paraffin oils. As can be seen from, during the reagent dosing period, there were no particular changes in the well performance. Treatment with hot oil on certain days was, as it were, of a preventive nature, since no changes were observed in the well parameters before and after heat treatment. When a certain layer thickness is formed in the tubing, the linear velocity of oil increases and begins to wash it away
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Pokrovskaya, Elena N. "Development of nanomodified multifunctional protection systems for wood structures". Vestnik MGSU, nr 1 (styczeń 2021): 59–66. http://dx.doi.org/10.22227/1997-0935.2021.1.59-66.
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Introduction. Nowadays multi-storey buildings, composed of wood structures, are built in different countries. The durabi-lity of structures depends to a large extent on the protection systems used. The most effective ones are multifunctional protection systems that rise the fire protection ability, hydrophobicity, and biostability of structural materials. The application of carbon nanotubes is expected to improve the uniformity of a protective layer and the coating performance. The purpose of the project is to develop a multifunctional protection system designated for wood structures. This system must ensure their fire resistance and hydrophobicity without deteriorating the mechanical properties of wood.
Materials and methods. Pine wood samples were used in the research. Carbon nanotubes were used as nano-modifiers. Wood samples, surface-modified with methylphosphonic (MPH) and nitrilo-trimethylphosphonic (NPH) acids, were used to develop multifunctional protection systems. Integrated protection systems were developed by adding carbon nanotubes. Fire hazard properties were assessed pursuant to GOST 27484-87, water absorption properties were analyzed pursuant to GOST 16483.20-72, mechanical properties were addressed with reference to GOST 16483.11-72 and 16483.10-73. Hydrophobicity was evaluated using the wetting angle method. The character of the sample surface and its chemical composition were studied using the double-beam scanning electron-ion microscope FEI Quanta 3D FEG with an EDAX Octane select attachment needed for the energy dispersion analysis.
Results. All studied coating systems belong to the first group of the fire retardant efficiency, the best of them reduce weight loss in the course of combustion of samples: Δweight = 3.7 – 1.34 %. Wood develops hydrophobic properties; its water absorption reduces 1.5-fold, while its across-fiber mechanical compressive strength goes up 1.6-fold. The assessment of the wood surface and its chemical composition shows that high fire resistance correlates with higher phosphorus content in the char layer formed during combustion.
Conclusions. Surface modification of wood by protection systems is recommended as an effective means of rising the durability of structures.
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Ito, Satoshi, Katsuya Ikuta, Katsunori Sasaki, Motohiro Shindo, Yoshihiro Torimoto i Yutaka Kohgo. "Nobel Non-Transferrin-Bound Iron (NTBI) Measuring System Utilizing Automatic Analyzer". Blood 120, nr 21 (16.11.2012): 3207. http://dx.doi.org/10.1182/blood.v120.21.3207.3207.
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Abstract Abstract 3207 Introduction and Aim: Iron is an essential metal in the body, but its overload causes various organ damages through free radical productions. When the balance of iron metabolism is collapsesed by a prolonged transfusion and iron medication etc, transferrin (Tf) will be saturated and non-Tf bound iron (NTBI) will appear in the serum. It has been reported that NTBI relates to oxidant stress and cellular damages. Concerning the measurement of NTBI in blood, there are several problems including the expensive consumables and the long time to measure. Moreover, the method of measuring NTBI was extremely complicated, so that very limited institutions can use this at the present. Among several methods, we focused on high-performance liquid chromatography (HPLC)-based NTBI assay. The principle of measurement of HPLC method is bases on Gosriwatana I et al. (Anal Biochem, 1999); NTBI in serum was initially chelated by NTA and iron was transferred to another chelator, CP22, which had chromogenic effect when bound to iron. At last, the level of iron was quantitated by HPLC system. We improved the sensitivity of this method and reported by extreme reducing background iron contamination (Sasaki K et al. Mol Med Report, 2011). However, HPLC method still needs some improvement, because this method requires the samples and takes long time to measure, so that the many sample handling is difficult. Therefore, the novel measuring system within automated analyzer equipped in many hospitals is desired. From such a background, we aimed to develop the novel NTBI measuring reagent corresponding to the automatic analyzer by modifying the HPLC method. Methods: We developed the novel NTBI measuring system using NTA and Nitroso-xxxx (PSAP) as the chromogen instead of CP22. This system does not need any pre-treatment of serum samples. Then, we examined the basic performance of the novel NTBI reagent, and compared to HPLC method. Data analyses were performed using HITACHI 7700 auto analyzer. The following points were examined: (1) reproducibility (N=20), (2) comparison between the linearity of actual measured data and that of theoretically calculated data, (3) detection limit, (4) relation between the Tf saturations and NTBI values, (5) comparison of the value measured by the HPLC method and the value measured using novel NTBI measuring system. Result and Conclusion: Reproducibility was satisfactory (NTBI levels of pooled serum were 0.491±0.190μM). And measured values using this novel system showed a dose-dependent curve under the iron concentrations between 0 to 5μM. The detection limit was found to be 0.5μM using ±2.6SD at zero concentrations and was also able to detect the NTBI in blood in healthy person serum. In serum, when Tf saturation was approaching to 100%, NTBI turns into high values. When NTBI values of the serum obtained from the patients with written informed consent were measured, positive correlation (R2=0.935) was observed between the Tf saturation and NTBI. Moreover, the data obtained by HPLC method correlate positively with those determined by novel measuring system (R2=0.876). These should indicate that our novel measuring system for NTBI possess comparable efficiency compared with the HPLC method. Moreover, our new method should have quite attractive advantages: (A) that can measured approximately 800 samples in 1 hour, (B) that does not need any pre-treatment of sample serum, and (C) that does not need any expensive consumables, meaning excellent cost-benefit. Therefore our new method for the NTBI measuring using automatic analyzer must be useful and powerful for the research to elucidate the clinical importance of NTBI in various diseases in the near future. Disclosures: No relevant conflicts of interest to declare.
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Plakhin, Andrey, Igor Semenets, Ekaterina Ogorodnikova i Maria Khudanina. "New directions in the development of neuromarketing and behavioral economics". MATEC Web of Conferences 184 (2018): 04023. http://dx.doi.org/10.1051/matecconf/201818404023.
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The article substantiates the relevance of neuromarketing studies based on an understanding of the basic functional mechanisms of the consumer's nervous system. Such studies include high-precision hardware testing of unconscious human responses to audio-visual or any other stimulus. Neuromarketing is considered as a symbiosis of separate disciplines: psychology and psychophysiology, traditional marketing and economics, neurobiology, econometrics, etc. In the work comparison with traditional marketing researches on such parameters as: objectivity of an estimation of results received during researches is made; also effectiveness of application in practices was investigated; sample for the study is selected; cost of research and interpretation of results are determined. The foreign experience of using neuromarketing technologies and behavioural economics on the example of such organizations as Singapore Airlines, Nike, Starbucks, automotive companies, universities, etc. was studied. Comparison with the Russian level of development of innovative marketing is made. Recommendations are given on the introduction of neuromarketing in the Russian automotive industry using the example of AvtoVAZ. The efficiency and value of carrying out neuromarketing research in the enterprise and the possible economic effect are calculated. The main tasks of modern higher education are marked and innovations in the learning process are proposed.
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Jafari, Nafiseh, Annika Dorn, Jason Saenz, Lauren Lee, Carlos Hernandez, Andrew Dunnigan i Mayer Saidian. "Abstract 2430: Enhancing urine-based cfDNA detection for prostate cancer diagnosis through increased urine input volume". Cancer Research 84, nr 6_Supplement (22.03.2024): 2430. http://dx.doi.org/10.1158/1538-7445.am2024-2430.
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Abstract Introduction: Cell-free DNA (cfDNA) extracted from urine has created new opportunities in non-invasive cancer diagnostics, particularly for prostate cancer. Detecting cfDNA in urine can be challenging due to its inherently low concentration. Increasing the input volume of urine addresses this limitation, enhancing the sensitivity of cfDNA detection. This study explores the benefit of collecting larger volumes of urine spiked with a TP53 mutation and the corresponding increase in assay sensitivity for early prostate cancer diagnosis and monitoring. Methods: Pooled urine from healthy donors was collected, preserved, processed, and extracted from 10 mL, 20 mL, 30 mL, 40 mL, and 50 mL inputs (with four replicates each) using the Revolution Max 20 cfDNA Extraction kit. Replicate samples were also extracted using a MagMAX cfDNA Isolation kit from Thermo Fisher Scientific. All samples were spiked with a cfDNA standard containing TP53 R58L mutation. The quantity and quality of extracted cfDNA were determined using the Agilent TapeStation system with the Cell-free DNA ScreenTape assay and qPCR mutation detection assay. Results: The Revolution Max 20 cfDNA kit consistently delivered a higher yield of cfDNA, demonstrating excellent extraction efficiency and quality, as shown by the Agilent Cell-free DNA ScreenTape assay. Notably, the Revolution Max 20 cfDNA kit exhibited a linear increase in yield as the sample volume grew from 10 mL to 50 mL. The MagMax kit did not provide this yield linearity. Furthermore, both methods successfully maintained the integrity of cfDNA fragmentation, which was confirmed through the Agilent Cell-free DNA ScreenTape assay. Conclusion: Compared to the MagMax kit, the Revolution Max 20 cfDNA kit outperforms in extracting cfDNA with high efficiency, as shown by the Agilent Cell-free DNA ScreenTape and the qPCR assay. The Revolution Max 20 cfDNA kit offers the unique advantage of accommodating up to 50 mL of urine in a single extraction. As input volume increases, it consistently produces high cfDNA yields while maintaining quality. In contrast, the MagMax kit is limited to an input volume of only 10 mL, necessitating the cumbersome process of dividing a 50 mL urine sample into five separate extractions and pooling the eluates. This scheme resulted in lower yields. The Agilent Cell-free DNA ScreenTape assay is a valuable tool for quickly and accurately assessing the %cfDNA quality metric. Its minimal sample volume requirement makes it an efficient quality control method for determining cfDNA samples before performing downstream testings. The enhanced capability of the Revolution Max 20 kit to yield more significant quantities of high-quality cfDNA from urine samples can profoundly impact liquid biopsy test sensitivity and the early detection of prostate cancer, potentially revolutionizing the diagnostics process. Citation Format: Nafiseh Jafari, Annika Dorn, Jason Saenz, Lauren Lee, Carlos Hernandez, Andrew Dunnigan, Mayer Saidian. Enhancing urine-based cfDNA detection for prostate cancer diagnosis through increased urine input volume [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 2430.
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Shabalova, I. P., i A. A. Kireev. "THE POTENTIAL FOR CYTOLOGICAL DIAGNOSIS OF MALIGNANT MELANOMA METASTASIS IN THE LUNG. CASE REPORT". Laboratornaya i klinicheskaya meditsina. Farmatsiya, nr 8 (2023): 37–45. http://dx.doi.org/10.14489/lcmp.2023.02.pp.037-045.
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Cytology is known to be a highly effective method of diagnosis of lung metastases. The cytomorphological criteria for lung metastases of malignant melanoma are known and described in the literature, but are few in number and there are some objective difficulties in the differential diagnosis of malignant melanoma metastases of other lung lesions. This paper presents a clinical and morphological case of MM metastasis and demonstrates the high efficiency of the traditional (classical) cytological method in its diagnosis according to established the cytomorphological criteria, which complements the data from the literature. Introduction. Distant metastases of malignant neoplasms of various organs, including melanoma, are common in the bronchopulmonary system. Cytological examination as a minimally invasive and highly effective method has an important place in the diagnosis of malignant melanoma metastases in the lungs. Case Presentation. This article presents a clinical and morphological case of metastatic lung melanoma in a 73-year-old man. Cytological examination of fine needle biopsy samples was used to assess the lesion. Conclusion. This work demonstrates the high efficiency of the cytological method for the diagnosis of lung metastasis from malignant melanoma metastases. The cytomorphological changes established in the study are comparable to the data from the literature and complement them.
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Ponkratova, A. O., A. K. Whaley, V. G. Luzhanin i E. V. Zhokhova. "Using high performance thin layer chromatography for the detection of pharmacologically active secondary metabolites in Empetrum nigrum L." Drug development & registration 10, nr 4 (25.12.2021): 129–37. http://dx.doi.org/10.33380/2305-2066-2021-10-4(1)-129-137.
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Introduction. The article presents the results of the detection of pharmacologically active secondary metabolites in black crowberry Empetrum nigrum L. using the method of high performance thin layer chromatography (HPTLC).Aim. To show the efficiency of HPTLC for conducting preliminary phytochemical analysis to determine the main groups of metabolites in promising medicinal plant species.Materials and methods. HPTLC analysis was carried out on a CAMAG device (Switzerland), using MERCK HPTLC silica gel 60 F154, 20 × 10 cm plates. For the evaporation of the samples, a Heidolph vacuum rotary evaporator (Germany) was used. The aerial parts (shoots) of Empetrum nigrum were harvested next to St. Petersburg State Chemical and Pharmaceutical University (SPCPU) nursery garden of medicinal plants (Leningrad Region, Vsevolozhsky District, Priozerskoe Highway, 38 km) in August 2019.Results and discussion. In the course of the research, four fractions from the aerial parts of Empetrum nigrum were obtained: hexane, dichloromethane, butanol, and water. Then, these fractions were investigated by HPTLC in two solvent systems – n-butanol : acetic acid : water (BAW) (4 : 1 : 2) and hexane : dichloromethane : methanol (HDM) (1 : 2 : 0.5). After scanning densitometric analysis of the plates eluted in the HDM system, it was revealed, that the hexane and dichloromethane fractions have a similar composition and contain the greatest amount of compounds, compared to the butanol and water fractions, and in the BAW system, it was found, that the butanol fraction contains the greatest variety of metabolites. As a result of UV spectroscopy, it was found, that the main groups of compounds contained in the hexane and dichloromethane fractions are derivatives of chalcones, dihydrochalcones, bibenzyls and 9,10-dihydrophenanthrenes. While in the butanol fraction, the main groups of secondary metabolites were derivatives of flavonoids and tanninsConclusion. The data obtained allow us to note the efficiency, speed and simplicity of HPTLC for conducting preliminary phytochemical analysis to determine the main groups of metabolites of promising medicinal plant species.
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Almahamid, Soud. "The influence of ERP system usage on agile capabilities". Information Technology & People 32, nr 6 (2.12.2019): 1633–56. http://dx.doi.org/10.1108/itp-02-2018-0055.
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Purpose Synthesising theories of enterprise resource planning (ERP), psychological empowerment and agile capabilities, the purpose of this paper is to build and test a novel theoretical model linking ERP system usage with agile capabilities via users’ psychological empowerment in Jordanian commercial banks. Design/methodology/approach A questionnaire was developed to collect the relevant data based on the extant literature. The population of this study consisted of all ERP system users working at Jordanian commercial banks in Amman City. The questionnaire was circulated to a purposive sample of actual users of ERP systems for two reasons. First, it was not possible to obtain a list of actual ERP users in each bank, for security and privacy reasons. Second, actual users of ERP systems are the most relevant source of information. Findings The results revealed that ERP system usage has a significant positive impact on both agile capabilities and users’ psychological empowerment. The results also showed that users’ psychological empowerment has a significant positive impact on agile capabilities. In addition, the results provide empirical evidence that users’ psychological empowerment plays a mediating role between ERP system usage and all agile capabilities except responsiveness. Furthermore, by adding users’ psychological empowerment to the original research model, the study demonstrates a good predictive relevance for agile capabilities. Research limitations/implications The study only focuses on Jordanian commercial banks; it is a cross-sectional study; and the study data were subjective, reflecting respondents’ opinion on specific time. Practical implications Practitioners struggle to ensure high levels of ERP usage by target users, to achieve implementation success and to achieve expected benefits. More often, practitioners have focused on the ERP system project team, vendors and technical issues, but have ignored the human side of the implementation process. Hence, they have failed to acknowledge the role of psychological empowerment in ERP system acceptance and success. Practitioners are advised to promote the ERP system as a facilitation and empowerment tool for users rather than a means of surveillance and control. Moreover, practitioners can avoid high rates of ERP failure in the adoption and post-adoption stages by changing the aim of the ERP system introduction from increasing efficiency and visibility to enhancing users’ psychological empowerment. Practitioners can leverage agile capabilities to respond to changes in the business environment by ensuring healthy psychological empowerment for all ERP users to use the system to its full capacity and to exchange information between functional units in real time. Practitioners must ensure users’ psychological readiness to use the system before the system goes live. Originality/value The study developed and tested a new research model using the SmartPLS approach in a novel context.
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Bakhtiar, Maryam, Manoosh Mehrabi, Farkhondeh Elahi, Nooshin Sadat Shojaee i Hossein Hassani. "Design, implementation, and evaluation of the smartphone-based application for dental treatment in oral and dental injuries". Journal of Oral Health and Oral Epidemiology 12, nr 2 (24.07.2023): 59–64. http://dx.doi.org/10.34172/johoe.2023.10.
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Background: Injuries to the mouth and teeth due to various incidents have a high prevalence in society; therefore, it is necessary to diagnose them and provide a suitable treatment plan for them. The purpose of this research is to design, implement and evaluate smartphone-based software for dental treatment in oral and dental injuries in pediatric patients. Methods: This study is an applied-production study conducted in three stages: The first step is the preparation and design of algorithms, the second stage is the introduction of diagnostic and therapeutic algorithms into the software system, and in the third stage, the software system is evaluated for its efficiency and accuracy in diagnosing and providing a treatment plan. The samples were all 77 patients who were referred to the trauma department of Shiraz Dental School from June to July 2019. Results: There was a significant correlation between the resident and the professor’s diagnosis with the software diagnosis, with 92.2% complete compliance, 3.9% relative compliance, and 3.9% non-compliance (kappa value=0.91, P value<0.0001). Conclusion: The accuracy and high speed of diagnosis and the offered treatment plan for all types of oral and dental trauma were acceptable. However, the software cannot replace a specialist and should be used in combination with expert opinion.
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Korniienko, I., S. Korniienko, V. Shevaha, O. Rudenko i O. Zhyrna. "FUNCTIONAL SIMULATION AND DATA FLOW ANALYSIS OF THE ARMAMENT AND MILITARY EQUIPMENT TESTING SYSTEM". Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки, nr 10 (30.12.2021): 83–93. http://dx.doi.org/10.37701/dndivsovt.10.2021.09.
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The urgency for timely and high-quality provision of the process of testing armaments and military equipment is determined by the constant need to rearm and equip the Armed Forces of Ukraine with advanced specimens of combat equipment, which is one of the components of proper national defence capability. The worsening of this problem in recent years was due to the hybrid aggression of the Russian Federation, which has led to the intensification of the processes for the development of modern military equipment and the acceleration of the army’s rearmament processes. This led to an increase in the flow of technical specimens requiring testing, which in turn led to an increase in the efficiency of mass testing. In addition to other measures, the automation of all information processes accompanying the test can increase the capacity.
The pre-project phase of the development of an information system to accompany the testing of armament and military equipment is considered in the article. On the basis of the legislative acts in force and normative and methodical documents the functional decomposition of the standard sample test processes to the depth of 3-4 hierarchical levels has been carried out. Functional decomposition of the test system was performed by SADT technology, namely the IDEF0 functional modeling technique. This allowed obtaining a list of data flows circulating in the test system.
The analysis of information flows is carried out, namely the type of information connection between functions, the need for information support at different stages of the test, the importance of the information resources for the testing phase, the need for information array of scientific, methodological, regulatory data. An assessment was made of the inter-system connectivity of the testing processes, taking into account the type of inter-functional communication.
It is expected that the introduction of an information tracking system for the testing of armament and military equipment could significantly increase the capacity of the testing organization while ensuring the quality of the results obtained.
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Toncheva, K. D., D. M. Korol, I. V. Zaporozhchenko, D. V. Kalashnikov i D. D. Kindii. "DETERMINATION OF DEPENDENCE OF CHEWELESS EFFECTS FROM TEMPERAMENT". Ukrainian Dental Almanac, nr 1 (21.03.2018): 47–50. http://dx.doi.org/10.31718/2409-0255.1.2018.11.
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Introduction. Studies have shown that the style of each person's activity largely depends on the type of higher nervous activity entering the structure of his temperament.
The temperament of an individual is considered innate, because it is a psychic property that does not lend itself to pedagogical correction and volitional regulation. Since the type of temperament affects the overall activity of the person, the idea arose to investigate the possibility of its influence on the work of the maxillofacial apparatus of young, healthy people.
The aim of the work is to analyze the degree of dependence between chewing efficiency and human temperament with the help of the proposed improved method of chewing sampling.
Materials and methods. The study, in which 59 people took part, of them 27 men (45.8%) and 32 women (54.2%) aged 17-25 years, was conducted on the basis of the laboratory of the Department of Propaedeutics of Orthopedic Dentistry of the HSEEU "Ukrainian Medical Stomatological Academy "(Poltava). The analysis of the obtained data showed absolute numerical superiority among the surveyed representatives of two temperamental groups: 1 group - sanguine, 17 of them 10 men and 7 women; 2 group - choleric people, 24 of them 9 men and 15 women.
Samples for the chewing test were colloidal mass of agar-agar in the form of cylinders with a height of 10 and a diameter of 20 millimeters. All participants did 10 conventional chewing movements to grind the samples, after which all fragments of the test material were collected, washed, dried, the information was converted into photograph and was recorded in a computer base.
Results. In the sanguine group, in determining the masticatory efficiency, the total number of fragments of the test sample ranged from 140.6 to 471.3, the average area of the fragments was 91.727 - 345.175 pxl2. In the choleric group, the total number of fragments of the test sample ranged from 194 to 644, and the average size of the fragments in the choleric group fluctuated 75.15 - 191.101 pxl2.
The results of the study showed that representatives of the choleric group had a large total number of fragments of the test sample and a smaller average area. An increase in the number of fragments and a decrease in their area indicate a high masticatory efficiency, and therefore a better quality of chewing food, is observed in the choleric group. In the sanguine group, there is less total number of fragments and a larger average area compared to choleric, which indicates a lower chewing efficiency and, correspondingly, worse processing of food.
Hypothesis (M0) on the absence of a statistical relationship between the parameters of the chewing test and a certain type of human temperament was developed. Accordingly, the alternative hypothesis (M1) relied on the assumption of a statistical relationship between these indicators. The obtained results did not allow rejecting the null hypothesis as when comparing the values of the total number of fragments and the mean values of these fragments. But, the confidence interval (0.052) of the mean fragment area values approaches the accepted critical level of significance (p = 0.05).
Conclusions. Further statistical analysis showed that the numerical index of the average area of the chewing gum fragments is more reliable to a certain type of temperament in the experienced persons, which makes it possible to consider this parameter as a sensitive marker for assessing the condition of the dentoalveolar system in normal and pathological changes, including when determining the effectiveness of the orthopedic treatment.
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Tang, Rongnian, Kaixuan Jiang, Chuang Li, Xiaowei Li i Jingjin Wu. "Modeling to Correct the Effect of Soil Moisture for Predicting Soil Total Nitrogen by Near-Infrared Spectroscopy". Electronics 12, nr 6 (7.03.2023): 1271. http://dx.doi.org/10.3390/electronics12061271.
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Near-infrared (NIR) spectroscopy can improve the efficiency of soil property prediction, such as that of soil total nitrogen (TN) content. However, soil spectra are very sensitive to soil moisture content, which is a crucial factor affecting the accuracy of soil nutrient composition prediction. In response to this issue, the goal of this study is to identify the best model to correct the effect of soil moisture for predicting soil total nitrogen by near-infrared spectroscopy. The 107 collected soil samples were divided into six different water content (0%, 5%, 10%, 15%, 20%, and 25%) sample groups. Then, five correction methods, including direct standardization (DS), piecewise direct standardization (PDS), external parameter orthogonalization (EPO), spectral space transformation (SST), and slope/bias (S/B), were executed. Finally, partial least squares regression (PLSR) models were established to forecast TN content. The results showed that SST could minimize the influence of moisture. Furthermore, SST–PLSR had the best TN content prediction accuracy: Rp2 (the coefficient of determination of the prediction set) in the range of 0.81–0.82, RMSEP (the root mean square error of the prediction set) in the range of 0.09–0.10 g/kg, and RPD (ratio of performance to deviation) in the range of 2.32–2.40. Therefore, the dry soil prediction model is competent for wet soil samples and could achieve preciseness in TN content prediction. The use of SST can effectively eliminate the influence of moisture and achieve high-precision TN prediction in wet soil samples. Additionally, the introduction of SST expands the application scope of soil nutrient prediction models and increases model robustness.
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Skyba, O., I. Domanov, D. Rybachok i A. Skyba. "APPROACHES TO INCREASE THE EFFICIENCY OF TRAINING AND TESTING BY CREATING A UNIFORM INFORMATION AND REFERENCE SYSTEM AND AUTOMATING THE ACTIVITIES OF THE INSTITUTE’S SCIENTISTS". Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки 18, nr 4 (1.12.2023): 104–11. http://dx.doi.org/10.37701/dndivsovt.18.2023.15.
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The article is devoted to ways of solving certain problematic aspects of the preparation and conducting of tests, caused by the lack of a centralized approach to the creation, replenishment and access of scientists of the institute to the regulatory and legal framework and other materials necessary for the development of organizational and methodical documents for conducting tests. This causes long-term, not always high-quality preparation and testing of weapons, military, special equipment, ammunition, software and other types of experimental samples.
The authors of the article outline approaches to increase the efficiency, automation, and quality of preparation and testing. For this purpose, it is proposed to create a single information and reference system at the institute, built on the basis of global (cloud environment) and local (local computer network) data exchange systems.
The proposed approaches provide for the implementation of advanced information technologies that ensure the accumulation, search, access and use by scientists of the State Research Institute of Testing and Certification of Weapons and Military Equipment of the necessary regulatory and legal acts, organizational and methodological documents, reporting materials and other reference data at the stages preparation and testing of weapons, military, special equipment, ammunition, software and other types of prototypes.
The introduction of the proposed approaches will reduce the cost of human resources for the preparation for the tests, will ensure the improvement of the quality of working out the organizational and methodical documents, which will ensure the proper conduct of the tests by the test team.
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Mozharovskiy, Andrey V. "DESIGN OF LENS ANTENNA WITH PLANAR ORTHOMODE TRANSDUCER FOR 28 GHZ FIXED SERVICE COMMUNICATION SYSTEMS". Journal of the Russian Universities. Radioelectronics 22, nr 3 (2.07.2019): 48–62. http://dx.doi.org/10.32603/1993-8985-2019-22-3-48-62.
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Introduction. Millimeter-wave frequency range can provide utilization of wide transmission frequency bands and therefore a significant increase of the capacity in modern communication systems. One of the main concerns in the design of the 27.5…29.5 GHz-wave communication system is a high gain antenna of the range of 30 dBi to compensate the significant level of radio signal attenuation in the communication channel compared to the traditional frequency bands below 6 GHz. Objective. Development of the integrated lens antenna with the ability to operate on two orthogonal linear polarizations to separate the transmitted and received signals by polarization and, therefore, to create more efficient use of the spectrum. At the same time, an important task is to provide a high aperture efficiency of the antenna and a low level of insertion loss in the distribution system, which should have an interface based on printed transmission lines for connection to the radio frequency circuit elements realized on the printed circuit board. Materials and methods. The main method of the analysis of the lens antenna characteristics is full-wave electromagnetic simulation in the computer-aided design system CST Microwave Studio. The results are confirmed with experimental samples measurement. Results. The designed antenna is an integrated lens antenna consisting of a homogeneous semi-elliptical dielectric lens with a diameter of D = 120 mm with a cylindrical extension and a primary radiator based on a microstrip antenna with a waveguide adapter. Waveguide adapter radiating opening dimensions were optimized using an analytical method based on a combination of geometrical and physical optics. Two orthogonal polarizations are excited on the primary microstrip patch antenna with the corresponding closely spaced “H-type” slots in one internal metallization layer. According to experimental results, the designed antenna provides the gain level of 29.5…30.2 dBi with a halfpower beamwidth of 4.8…5.1 degrees and cross-polarization level exceeding 37 dB for both polarizations in the whole frequency band of 27.5…29.5 GHz. Conclusion. The simplicity of the design, high aperture efficiency and the ability to operate on two orthogonal linear polarizations show that the developed lens antenna can be successfully used in radio communication systems of the 27.5…29.5 GHz frequency range.
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Lukhverchyk, L. N., G. L. Alatortseva, L. N. Nesterenko, V. Y. Kabargina, V. V. Dotsenko, I. I. Amiantova, O. B. Vylivannaya i in. "Development of the ELISA Test System for Quantitative Determination of IgG to the Varizella zoster virus in Human Serum and Assessment of its Diagnostic Efficiency". Epidemiology and Vaccinal Prevention 20, nr 6 (6.01.2022): 72–80. http://dx.doi.org/10.31631/2073-3046-2021-20-6-72-80.
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Relevance. The introduction of Varicella vaccine prophylaxis explains the need to develop a methodology for monitoring the vaccination effectiveness and the intensity of population immunity. This problem can be solved using quantitative immunoassay methods. Aim. Development of an enzyme-linked immunosorbent assay for the concentration of class G immunoglobulins (AB) to Varicella zoster virus (VZV) determining and assessing its functional characteristics and diagnostic efficiency. Materials and methods. Recombinant antigen GE VZV. WHO International Standard for Antibodies to VZV W1044. Blood serum samples from healthy people and patients with Chickenpox and Herpes zoster, blood serum samples containing IgG antibodies to herpes simplex viruses of the first and second types, cytomegalovirus, Epstein-Barr virus. Anti-VZV ELISA (IgG) reagent kit (Euroimmun, Germany). Indirect enzyme-linked immunosorbent assay. Immunization of animals with recombinant antigen GE, isolation, and purification of specific antibodies. Conjugation of monoclonal antibodies to human IgG with antibodies to antigen GE and with horseradish peroxidase. Results. An enzyme-linked immunosorbent assay in «an indirect» format has been developed to determine the specific antibodies to VZV concentration (IU/ml) in human serum/plasma. An artificial calibrator for determining the concentration of AB-VZV had been synthesized and standardized according to the International WHO-standard W1044. The main functional characteristics of the developed enzyme-linked immunosorbent assay are determined in accordance with GOST 51352-2013. The diagnostic kit was tested on blood serum samples from children with chickenpox (n = 43), adults with Herpes zoster (n = 158), healthy individuals (n = 781). The diagnostic sensitivity of the test system was 85%, the diagnostic specificity was 87% according to the ROC analysis. The absence of cross-reactivity of the test system was shown on samples with serological markers of other herpesvirus infections (n = 94). Comparative trials of the developed test system and its commercial analog, the Anti-VZV ELISA (IgG) reagent kit, did not reveal statistically significant differences between their functional characteristics. Conclusions. The developed test system for determining of the AB-VZV concentration in human serum/plasma in terms of its functional characteristics meets the GOST requirements, is characterized by high diagnostic efficiency, can be used to monitor the effectiveness of vaccine prophylaxis and strength of population immunity, as well as to assess the immune response in chickenpox and Herpes zoster.
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Lu, Yujing. "Enhanced Network Security Protection through Data Analysis and Machine Learning: An Application of GraphSAGE for Anomaly Detection and Operational Intelligence". Journal of Computing and Information Technology 31, nr 4 (28.05.2024): 233–49. http://dx.doi.org/10.20532/cit.2023.1005776.
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With the Internet's rapid expansion, network security challenges have become increasingly complex and prominent. Traditional protection methods, largely dependent on predefined rules and patterns, demonstrate limited effectiveness against sophisticated and unknown network attacks, failing to harness the full potential of extensive network data. This study addresses the challenges faced by modern cybersecurity, particularly the limitations of traditional defense methods in countering unknown and complex attacks, by proposing a solution that integrates data analysis and machine learning technologies. The focus of this research is placed on network security anomaly detection as well as on intelligent network operations and maintenance exception management based on graph network algorithms, aiming to enhance security defense capabilities and operational efficiency. Specifically, the main contributions and innovations of this paper include: 1. Innovations in sampling, aggregation, and loss functions within the Graph Sample and Aggregation (GraphSAGE) model to improve the accuracy and robustness of the model for network anomaly detection; 2. The introduction of a novel network anomaly root cause analysis and localization model, which, combined with an optimized root cause likelihood assessment method and search scheme, significantly enhances the speed and accuracy of anomaly localization; 3. The design of an integrated decision support system that can automatically adjust protection strategies as network conditions change, achieving a high level of automation and intelligence in cybersecurity management. This work not only provides effective technical support for network security protection but also opens new avenues for future cybersecurity research.
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Syrovatka, Vladimir I., Natalya V. Zhdanova, Aleksandr N. Rasskazov i Dmitriy I. Toropov. "Barothermal Processing of Animal Feed Ingredients". Engineering Technologies and Systems 29, nr 3 (30.09.2019): 428–42. http://dx.doi.org/10.15507/2658-4123.029.201903.428-442.
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Introduction. The article substantiates the need for high-temperature processing of feed ingredients. Principles of operation and design features of the applied methods and equipment for feed production are considered. Phase transitions, along with advantages and energy, technological, and technical drawbacks are highlighted. The aim of the study is to justify a possibility of creating high-efficiency production lines using heat treatment of feeds by application of heat valves ensuring continuous loading of raw materials into a reactor and discharge of the treated feed at high pressures and temperatures. Materials and Methods. It is proposed to transfer the process of barothermal processing to a higher zone of the phase diagram of the system p,t (pressure and temperature). This is a section of the superheated steam zone with temperature 300–374 °C, pressure 12–21 MPa and treatment exposure 30–60 seconds, which replaces costly processes of normalizing, expansion, extrusion and granulation. The change in enthalpy in the pressure range 0–21 MPa and temperature range 0–600 °C is shown. Thermal modes are presented as formulas which is the basic condition for the use of digital technologies. Results. The design of the reactor with a thermal gate for loading and unloading, being the main unit of the production line of the feed heat treatment, was proposed. The results of the study are fundamental for the development of the sample flow low-capacity line. Discussion and Conclusion. The transfer of the process of barothermic processing of feed into the zone of superheated steam allows for the transfer of poorly digestible elements of grain and legumes in easily digestible, pathogen-free feed. Advantages of the reactor and line include the user-friendly design, energy saving and possibility of implementation of advanced digital technologies.
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Lima-Valassi, Helena P., Anna Sylvia Ferrari Marques, Atecla Nunciata Lopes Alves i Berenice B. Mendonca. "PSAT096 Development and Validation of Mitotane Determination in Plasma Samples by LC-DAD". Journal of the Endocrine Society 6, Supplement_1 (1.11.2022): A117—A118. http://dx.doi.org/10.1210/jendso/bvac150.239.
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Abstract Introduction Mitotane (o,p'–DDD) is the drug of choice for adrenocortical carcinomas (ACC) and its measurement in plasma is essential to control drug administration. Objective To develop and validate a simple, reliable and straightforward method for Mitotane determination in plasma samples. Method Drug free plasma samples were collected in potassium-ethylenediamine tetraacetate (K-EDTA) tubes and spiked with 1.0, 2.5, 10.0, 25.0 and 50.0 µg/mL of DDD. p,p´-DDD was used as internal standard and was added at 25.0 µg /mL to each sample, standards and controls. Samples were submitted to protein precipitation with acetonitrile and than centrifuged and 50 uL sobrenadant was injecting into a 1260 Infinity II liquid chromatography system (Agilent Technologies) and DDD and IS were detected at 230 nm by diodo array detector (DAD) in a 12 minutes isocratic mode with a solvent mixture of 60% acetonitrile and 40% formic acid in water 0.1% pump mixed, at 0.6 mL/min flow rate. Chromatography column Waters Acquity HSS T3 was kept at 28°C. We evaluated sensitivity, precision, presence of carry-over, recovery, linearity and the accuracy of this method. Results Our method resulted in a symmetrical peak shape and good baseline resolution for DDD (mitotane) and 4,4´-DDD (internal standard) with retention times of 6.0min, 6.4mim, respectively, with resolution higher than 1.5. Endogenous plasma compounds did not interfere with the evaluated peaks when blank plasma and spiked plasma with standards were compared. Linearity was assessed over the range of 1.0 to 50.0 µg/mL for DDD (R2 > 0.9987 and a 97.8% - 105.5% extraction efficiency). Analytical sensitivity was 0.98 µg/mL, functional sensitivity was 1.00 µg/mL, intra-assay and inter-assay coefficient of variation were less than 9. 98%, carry-over was not detected, recovery ranged from 98% to 117% and high accuracy was observed (89.4% to 105.9%) with no matrix effects for mitotane measurements. Patient's samples results were compared with previous measurement by GC-MS method with a high correlation (r=0.88 and bias=-10.2%) showed that our method is usefull for routine mitotane measurement. Conclusion DDD determination in plasma samples by our developed and validated method is simple, robust, efficient and sensitive for therapeutic drug monitoring and dose management in order to achieve therapeutic index of mitotane in patients with adrenocortical cancer. Presentation: Saturday, June 11, 2022 1:00 p.m. - 3:00 p.m.
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Setko, Andrey G., Olesya M. Zhdanova i Pavel V. Lukyanov. "Features of physiological reactions to the learning load on students with different mental abilities". Hygiene and sanitation 101, nr 2 (10.03.2022): 211–17. http://dx.doi.org/10.47470/0016-9900-2022-101-2-211-217.
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Introduction. The possibility of increasing the efficiency of secondary general education by increasing the volume of educational loads and intensifying intellectual work in institutions specializing in teaching gifted and talented children has actualized the problem of the correspondence of educational loads to the functional capabilities of the student’s body. The aim of the study is to identify the features of the physiological reactions of the organism of students with different mental abilities to the training load. Materials and methods. The management of the educational process, the mode of the school day and the functional state of school-significant systems were assessed for students with high mental abilities, studying in the senior grades of a multidisciplinary Lyceum (n = 250) and students of a traditional school (n = 274) with an average level of mental abilities. Results. In comparison with the traditional school in the Lyceum for gifted children, an excess of the permissible level of the total weekly educational load, its irrational distribution during the school day and week, an intense level of intellectual, emotional and sensory loads, an intensive mode of work, characterized by a high workload of students with elective classes and homework, tasks. Under conditions of intense learning activity among students with increased mental abilities relative to these students of the comparison group, an increase in the level of mental performance was revealed due to stabilization of the nervous reaction and an increase in the functional capabilities of the nervous system; improvement of the functional state of the respiratory system; an increase of up to 1.6 times the number of students with good biological adaptation and a decrease of up to 1.5 times the number of subjects with a breakdown in adaptation. limitations. The sample of students with higher mental abilities presented from one public education institution for gifted children in the Orenburg region characterizes only the regional component, which does not allow considering the results obtained for all representatives of this group from other regions of the country. Conclusion. Thus, against the background of an increase in the volume and intensity of training loads in students with an average level of intelligence, there was established the formation of optimal mental performance, improving the functional state of the respiratory system, increasing in due to the stabilization of the nervous reaction and increasing the functionality of the nervous system; improvement of the functional state of the respiratory system, an increase by 1.6 times in the number of students with satisfactory biological adaptation and a decrease in the number of students with a breakdown in adaptation by 1.5 times. It has been established that under the conditions of their intensification of learning, students with increased mental abilities formed the best academic result, however, the failure of adaptive capabilities in every fifth subject with a high level of intellectual potential indicated that the body of students is functioning at the limit of their psychophysiological capabilities, which determines the need for the introduction an additional health-preserving component in the educational process of the lyceum with the aim of correcting students of the “risk group”.
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Komarov, V. A., A. V. Sarafanov i S. R. Tumkovskiy. "The Experience of Digital Transformation of Business Processes of Applied Experimental Research by Using the Multitenancy of the Resources". INFORMACIONNYE TEHNOLOGII 27, nr 1 (20.01.2021): 41–50. http://dx.doi.org/10.17587/it.27.41-50.
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As part of the digital transformation of various areas of human activity, the urgent task is to transform existing business processes (BP) in order to increase their variability according to the needs of the customer, to increase productivity, quality and competitiveness of products. The introduction of end-to-end digital technologies allows for this. The article examines the experience of transforming the BP of experimental research in solving a number of applied tasks in the field of electronic instrumentation, which is obtained as a result of the introduction of operation technology for test, research and laboratory equipment based on the concept of multitenancy. Developed on the basis of the experience of the authors, a number of industrial samples and prototype multiuser distributed measurement-control systems implementing this concept have allowed to transform the following processes: end-to-end BP of tests on-board electronic equipment of spacecraft (communications, relay, navigation, geodesy, remote sensing, etc.); BP of forming the operational load of the spacecraft's on-board relay complex; BP of conducting experimental laboratory research in the industry training system. The effectiveness of modernized BP was evaluated on the basis of their formalized models and a set of qualitative indicators. The key resulting effects of transformation: improving the quality of BP by improving the informativeness of individual business functions and the efficiency of the use of high-tech experimental equipment; reducing the number of gaps in BP by reducing the number of business roles involved in their implementation; reducing the duration of BP by significantly reducing material and time costs and improving the productivity of individual business functions; transition to a service model "Laboratory As Service" for access to high-tech equipment while performing experimental laboratory studies based on digital educational environments.
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Ushkalenko, Nikita D., Anna V. Ersh, Pavel V. Filatov i Alexander G. Poltavchenko. "The rapid ELISA method for detection of orthopoxviruses". Problems of Virology 68, nr 3 (6.07.2023): 242–51. http://dx.doi.org/10.36233/0507-4088-178.
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Introduction. Following the successful eradication of smallpox, mass vaccination against this disease was discontinued in 1980. The unvaccinated population continues to be at risk of infection due to military use of variola virus or exposure to monkeypox virus in Africa and non-endemic areas. In cases of these diseases, rapid diagnosis is of great importance, since the promptness and effectiveness of therapeutic and quarantine measures depend on it.
The aim of work is to develop a kit of reagents for enzyme-linked immunosorbent assay (ELISA) for fast and highly sensitive detection of orthopoxviruses (OPV) in clinical samples.
Materials and methods. The efficiency of virus detection was evaluated by single-stage ELISA in the cryolisate of CV-1 cell culture samples infected with vaccinia, cowpox, rabbitpox, and ectromelia viruses, as well as in clinical samples of infected rabbits and mice.
Results. The method of rapid ELISA was shown to allow the detection of OPV in crude viral samples in the range of 5.0 1025.0 103 PFU/ml, and in clinical samples with a viral load exceeding 5 103 PFU/ml.
Conclusions. The assay involves a minimum number of operations and can be performed within 45 minutes, which makes it possible to use it in conditions of a high level of biosecurity. Rapid ELISA method was developed using polyclonal antibodies, which significantly simplifies and reduces the cost of manufacturing a diagnostic system.
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Kuznetsov, Semyon Valerevich, Aleksei Nikolaevich Lodyagin, Bair Vasil’evich Batotsyrenov, Vladimir Leonidovich Reinuk, Andrej Georgievich Sinenchenko, Bogdan Sergeevich Litvincev, Alexandra Alexandrovna Kuznetsova i Nadezhda Anatol’evna Kirsanova. "New opportunities for effective identification of unknown toxicological patients (a case from practice)". Toxicological Review 31, nr 4 (30.08.2023): 255–61. http://dx.doi.org/10.47470/0869-7922-2023-31-4-255-261.
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Introduction. The article considers the issues of identification of unknown patients admitted to toxicological medical hospitals on the example of a case from practice. The aim of the study was to develop an effective way to solve the main problem of the lack of information about the identity of a significant part of patients with a toxicological profile during their stay in the hospital until discharge.
Material and methods. Based on the described practical case, a new highly effective method of identifying unknown patients with a toxicological profile, implemented using forensic DNA analysis, is proposed and tested.
Results. As promising ways to improve interdepartmental cooperation in relation to the identification of unidentified living persons who have been admitted with acute poisoning, an algorithm for transmitting selected DNA samples to the territorial bodies of the Ministry of Internal Affairs on a system streaming basis is described.
Limitations. Further verification of DNA samples according to the Federal Database of Genomic Information is carried out by the Ministry of Internal Affairs independently through the regional Forensic Centers of the Ministry of Internal Affairs of the Russian Federation, followed by informing the administration of the medical institution.
Conclusion. The results obtained within the framework of this study demonstrate the high efficiency of establishing the identity of toxicological patients staying in medical hospitals as unknown persons, which represents a direct economic benefit for the healthcare system in the form of an increase in the proportion of patients paid for by territorial health insurance funds.
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Radaykina, Elena A., i Aleksandr V. Kotin. "REPAIR OF POWER HYDRAULIC CYLINDERS USING NEW POLYMER COMPOSITE MATERIALS". Tekhnicheskiy servis mashin 3, nr 144 (wrzesień 2021): 138–45. http://dx.doi.org/10.22314/2618-8287-2021-59-3-138-145.
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The development and implementation of a new repair technology based on the use of polymer parts made of high-performance antifriction composites in tribo-couplings of power hydraulic cylinders will reduce the cost and repair time, significantly increase the reliability of the entire hydraulic system. (Research purpose) The research purpose is in increasing the efficiency of repairing of power hydraulic cylinders of agricultural machinery by restoring tribo-conjugations with new antifriction composites based on modified caprolon. (Materials and methods) The article presents the study of the physical and mechanical characteristics of samples of polymer composites according to well- known and original methods. Authors used computer programs and original methods of equipment suppliers in the study of compounding processes, rheological and tribotechnical tests. Theoretical research using the provisions of theoretical mechanics, elasticity theory and thermophysics has been conducted. A numerical study of the introduction of a spherical indenter into a sample of a viscoelastic composite material was carried out using the ANSYS software package, the MAPDL module. (Results and discussion) The article analyzes the obtained data on the elastic-strength, rheological and tribotechnical characteristics of the studied compositions of polyamide composites. The three-component composite containing 2 percent shungite, 0.5 percent graphite, 6 surfactants has the best complex of these properties. It has been proposed to restore the operability of the piston assembly and the front cover during the repair of the power hydraulic cylinder to change their design with the installation of guide support rings made of polyamide composite into the cover and piston of the hydraulic cylinders. This will lead to a significant reduction in the wear rate of the tribo-coupling parts and reduce the complexity of repairing hydraulic cylinders. (Conclusions) Restoration of tribo-couplings of power hydraulic cylinders with the installation of a guide ring made of a new polymer composite ensures a decrease in the maximum contact stresses, the rate of their increase with an increase in the gap and, as a result, a decrease in the wear rate of the contacted parts.