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1
Sun, Yawei, Guoyong Zhang, Xiaoqing Hou, Shuai Xiao, Xi Yang, Yali Xie, Xiyin Huang, et al. "SrfABC Toxin from Xenorhabdus stockiae Induces Cytotoxicity and Apoptosis in HeLa Cells." Toxins 11, no. 12 (November 22, 2019): 685. http://dx.doi.org/10.3390/toxins11120685.
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Our previous study showed that the srfABC operon, which was originally identified in Salmonella enterica as an SsrB-regulated operon clustered with the flagellar class 2 operon, exhibited significant cytotoxicity against insect midgut CF-203 cells and injectable insecticidal activity against Helicoverpa armigera larvae. The srfABC operon was widely distributed among bacteria, which raises the question of their biological roles in different species. In this study, we investigated the cytotoxic effect of SrfABC toxin on mammalian cell lines. When simultaneously expressed in the Escherichia coli cytoplasm, SrfABC exhibited cytotoxicity against all tested mammalian cancer cell lines (B16, 4T-1, Hep-3B, and HeLa) in a dose-dependent manner. Intracellular expression of SrfA–FLAG, SrfB–FLAG, or SrfC–FLAG also resulted in inhibition of proliferation and apoptosis on HeLa cells. When incubated with HeLa cells separately, SrfA, SrfB, and SrfC proteins alone could enter HeLa cells, then induce apoptosis and cytotoxicity. SrfC protein shifts its localization from cytoplasm to nucleus with the aid of SrfA and/or SrfB protein. Although SrfA, SrfB, and SrfC proteins alone exhibited a cytotoxic effect against HeLa cells, all three components were essential for the full cytotoxicity. Native PAGE and co-immunoprecipitation assay demonstrated that SrfA, SrfB, and SrfC proteins could interact with each other and form a heteromeric complex.
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Hughes, Luke D., Jamal Khudr, Edward Gee, and Anand Pillai. "Pitfalls preventing bone union with EXOGEN Low-Intensity Pulsed Ultrasound." SICOT-J 8 (2022): 15. http://dx.doi.org/10.1051/sicotj/2022012.
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Objectives: To evaluate the efficacy of EXOGEN in achieving union and common pitfalls in its use within the Manchester Foundation Trust (MFT) and Salford Royal Foundation Trust (SRFT). Method: Patients receiving EXOGEN therapy between 01/01/2017 and 31/12/2019 at hospitals within MFT and SRFT were identified using EXOGEN logbooks and hospital IT systems. An equal number of patients were included from both sites. Data were retrospectively collected from clinical documents detailing clinical presentation comorbidities, and radiographic images, determining the radiological union post EXOGEN therapy. In addition, local practices were observed and compared to EXOGEN’s standardized guidance for clinicians. Results: Fifty-eight patients were included in the primary review, with 9 subsequently excluded based on insufficient clinical data. 47% of patients achieved radiological union following completion of EXOGEN therapy. Outcomes of the 23 patients with persistent non-union were as follows – 18 were referred for revision surgery, 5 were prescribed further EXOGEN therapy, 2 refused or were unfit for further intervention, and 1 did not have a plan documented. No significant baseline differences were present in both outcome groups. However, at MFT and SRFT, rates of union with EXOGEN are below that previously published in the literature. Conclusion: EXOGEN has proven successful in facilitating union in established cases of non-union without the risk and cost associated with revision surgery. Centre outcome differences may be explained by failure to educate clinicians and patients on the correct use of the EXOGEN device, failure to standardize follow-up or monitor compliance, and must be addressed to improve current services.
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Zhou, Heng-Jun, Xiu-Jue Zheng, Feng-Zeng Jian, Yue-Hui Ma, and Ren-Ya Zhan. "Posterior Approach Combined with Thoracic Intervertebral Foramen Posterior Wall Opening and Spinal Reconstruction for Complex Thoracic Intervertebral Foramen Lesions: a Single-Centre Experience." Clinical Surgery Research Communications 3, no. 2 (June 25, 2019): 01–07. http://dx.doi.org/10.31491/csrc.2019.06.030.
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Background: Thoracic intervertebral foramen (TIF) lesions were really difficult to expose through posterior or transforaminal approaches. There was no effective treatment strategy, especially for complex ones. Methods: Between 2013 and 2015, 22 patients presenting with complex TIF lesions underwent posterior approach combined with TIF posterior wall opening and spinal reconstruction were retrospectively reviewed. After ascertaining the precise location of complex TIF lesions, incisions should allow for exposure of the lesion’s adjacent vertebral pedicle screw entry point. The adjacent pair of vertebral lamina and spinous processes is typically removed in a single piece, such that the intra-spinal section can be fully exposed. The posterior wall of the TIF is subsequently opened, allowing the intra-TIF and extra-spinal sections to be sufficiently exposed. Subsequently, spinal reconstruction at the appropriate level is required. When the ventral spinal column is intact, dorsal reconstruction is typically performed using the screw and rod fixation technique (SRFT). After the dorsal surface of the spine has been burnished, the removed vertebral lamina and spinous process are rendered granular to allow reconstruction of the TIF and fusion of adjacent vertebrae. Results: All patients presenting with complex TIF lesions were successfully treated with this approach. No patient had experienced any complications arising from SRFT use. No patient suffered intraspinal infection, incision splits, or CSF leakage in the short-term (between 1 and 3 months) or fixation loosening or spinal instability in the long-term (6–24 months). Imaging studies confirmed that the TIF and spinal reconstruction outcomes were favorable. Conclusion: A posterior approach combined with TIF posterior wall opening and spinal reconstruction is a rapid, effective, and reliable method in the treatment of complex TIF lesions. This technique can provide total lesion resection while reconstructing spinal stability. Keywords: posterior approach; thoracic intervertebral foramen (TIF); intervertebral articular process (IAP); spinal reconstruction; screw and rod fixation technique (SRFT)
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Rivera, Beverly, Francisco Zapata, and Vladik Kreinovich. "Security Risk Assessment: Towards a Justification for the Security Risk Factor Table Model." Journal of Advanced Computational Intelligence and Intelligent Informatics 19, no. 5 (September 20, 2015): 676–80. http://dx.doi.org/10.20965/jaciii.2015.p0676.
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One of the widely used methods to gauge risk is the Security Risk Factor Table (SRFT) model. While this model has been empirically successful, its use is limited by the fact that its formulas do not have a theoretical explanation – and thus, there is no guarantee that these formulas will work in other situations as well. In this paper, we provide a theoretical explanation for the SFRT formulas.
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Sáez de Villarreal, Eduardo, Jose Galán Molina, Guillermo de Castro-Maqueda, and José V. Gutiérrez-Manzanedo. "Effects of Plyometric, Strength and Change of Direction Training on High-School Basketball Player’s Physical Fitness." Journal of Human Kinetics 78, no. 1 (March 1, 2021): 175–86. http://dx.doi.org/10.2478/hukin-2021-0036.
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Abstract The study aim was to compare the effects of a 7-week plyometric, strength and change of direction (COD) training program on basketball-specific performance measures in high-school players. Forty male players were randomly assigned to one of the four groups: plyometric (PG, n = 10), strength (SG, n = 10), COD (CODG, n = 10), and control group training (CG, n = 10). Two training sessions were performed at weekly intervals before basketball training. Performance of the counter movement jump (CMJ), Abalakov jump (ABKJ), 10 m zig-zag sprint, 20 m in line sprint (measurements at 10 and 20 m), and sit and reach flexibility test (SRFT) was assessed before and after the intervention. A 4 (group) × 2 (time) repeated measures analysis of variances (ANOVA) was conducted for each variable. Bonferroni post-hoc tests were used when the interaction was significant. Significant (all p < 0.05) time x group interaction was noted for SRFT, CMJ, ABK, sprint, and zig-zag 10 m, in favor of the experimental groups compared to the control group. However, improvements in physical fitness were similar between the three experimental groups. In conclusion, 7 weeks of specific plyometric, strength and COD training produced similar medium to large improvements in physical fitness of high-school basketball players.
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Serbanescu, Agnes, Mona Barbu, Ionut Cristea, Lidia Kim, Gina Alina Catrina, Georgiana Cernica, and Ileana Nicolescu. "Municipal solid waste (MSW) - competitive raw materials for combustible materials obtaining." Romanian Journal of Ecology & Environmental Chemistry 2, no. 2 (October 14, 2020): 170–79. http://dx.doi.org/10.21698/rjeec.2020.221.
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Waste-to-energy projects can be classified as a complementary technology for energy recovery from nonrecyclable municipal waste fractions and should therefore not compete with measures to reduce, reuse, and recycle materials. The article presents the characterization of some treated municipal solid wastes as competitive raw materials for combustible materials obtaining. Samples with lignocellulosic and polymeric composition were analyzed, namely 3 samples of SRFs (solid recovered fuels) used as secondary raw material in cement plants, SRF1, SRF2, SRF3; a sample of RDF, consisting of household waste; a sample of fluff (a homogeneous mixture of non-hazardous waste - selected, mechanically treated and dried) used as a secondary raw material in cement plants; 4 samples of municipal solid waste, fractions smaller than 100 mm, after a bio-drying process, with composition: paper and cardboard (70-80%), wood (6-15%), plastic (6-10%), glass and metal (3-14%), MBU1, MBU2, MBU3, MBU4. The waste samples were characterized in terms of technical and elementary characteristics and the ash (obtained by the sample incineration) behavior in the combustion process. The mineral matter was investigated by the X-ray fluorescence analytical technique using the Rigaku CG X-ray Spectrofluorimeter. The analysis of the indices used for the slagging and deposit formation risks evaluation shows that the analyzed samples present an obvious risk of melt formation and deposits, due to a high content of base oxides and silicon oxide.
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Khan, A., F. R. Espinoza, T. Kneen, A. Dafnis, H. Allafi, B. Carter, M. Narro-Vidal, et al. "558 PREVALENCE AND IMPACT OF FRAILTY IN PATIENTS HOSPITALISED WITH COVID-19. THE SALFORD EXPERIENCE IN WAVES 1 AND 2." Age and Ageing 50, Supplement_2 (June 2021): ii14—ii18. http://dx.doi.org/10.1093/ageing/afab119.15.
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Abstract Introduction The COVID-19 pandemic has had an extensive impact on the frail older population, with significant rates of COVID-related hospital admissions and deaths amongst this vulnerable group. There is little evidence of frailty prevalence amongst patients hospitalised with COVID-19, nor the impact of frailty on their survival. Methods Prospective observational study of all consecutive patients admitted to Salford Royal NHS Foundation (SRFT) Trust between 27th February and 28th April 2020 (wave 1), and 1st October to 10th November 2020 (wave 2) with a diagnosis of COVID-19. The primary endpoint was in-hospital mortality. Patient demographics, co-morbidities, admission level disease severity (estimated with CRP) and frailty (using the Clinical Frailty Scale, score 1–3 = not frail, score 4–9 = frail) were collected. A Cox proportional hazards regression model was used to assess the time to mortality. Results A total of 693 (N = 429, wave 1; N = 264, wave 2) patients were included, 279 (N = 180, 42%, wave 1; N = 104, 38%, wave 2) were female, and the median age was 72 in wave 1 and 73 in wave 2. 318 (N = 212, 49%, wave 1; N = 106, 39%, wave 2) patients presenting were frail. There was a reduction in mortality in wave 2, adjusted Hazard ratio (aHR) = 0.60 (95%CI 0.44–0.81; p = 0.001). There was an association between frailty and mortality aHR = 1.57 (95%CI 1.09–2.26; p = 0.015). Conclusion Frailty is highly prevalent amongst patients of all ages admitted to SRFT with COVID-19. Higher scores of frailty are associated with increased mortality.
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Singh, Bhim, and Ram Niwas. "Single-Phase Power Generation Using Three-Phase Self-Excited Synchronous Reluctance Generator." International Journal of Emerging Electric Power Systems 15, no. 4 (August 1, 2014): 377–88. http://dx.doi.org/10.1515/ijeeps-2014-0006.
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Abstract This paper presents the single-phase power generation using a three-phase synchronous reluctance generator (SyRG) for a standalone diesel generator (DG) set based standalone supply system. A static compensator (STATCOM) is used for voltage control, harmonics reduction and load balancing on SyRG. The proposed system consists of a SyRG, a variable frequency drive of an induction motor used as a prototype of diesel engine (DE), a STATCOM and single-phase loads. The proposed system feeds single-phase loads in rural areas and telecom towers. The synchronous reference frame theory (SRFT)–based control algorithm is used for the control of STATCOM used for voltage control and load balancing of SyRG.
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Khan, A., F. R. Espinoza, T. Kneen, A. Dafnis, H. Allafi, B. Carter, M. Narro-Vidal, et al. "466 PREVALENCE AND IMPACT OF FRAILTY IN PATIENTS HOSPITALISED WITH COVID-19. THE SALFORD EXPERIENCE IN WAVES 1 AND 2." Age and Ageing 50, Supplement_2 (June 2021): ii14—ii18. http://dx.doi.org/10.1093/ageing/afab119.08.
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Abstract Introduction The COVID-19 pandemic has had an extensive impact on the frail older population, with significant rates of COVID-related hospital admissions and deaths amongst this vulnerable group. There is little evidence comparing the prevalence and impact of frailty amongst patients hospitalised with COVID-19 in wave 1 vs wave 2 of the pandemic. Methods Prospective observational study of all consecutive patients admitted to Salford Royal NHS Foundation Trust (SRFT) between 27th February and 28th of April 2020 (wave 1), and 1st October to 10th November 2020 (wave 2) with a diagnosis of COVID-19. The primary endpoint was in-hospital mortality. Patient demographics, co-morbidities, biochemical parameters, and frailty (using the Clinical Frailty Scale, score 1–4 = not frail, score 5–9 = frail) were collected. A Cox proportional hazards model associating wave and frailty with mortality was used. A logistic regression model was used to associate patient characteristics with wave. Both models adjusted for patient characteristics. Results A total of 700 patients were included (N = 429, wave 1; N = 271, wave 2). In wave 1, 42% (N = 180) were female; median age was 72; 37% (N = 160) were non-survivors, 49% (N = 212) were frail (CFS 5–9). In wave 2, 38% (N = 104) were female; median age was 73; 30% (N = 80) were non-survivors, 39% (N = 106) were frail. There was a reduction in mortality in wave 2, aHR = 0.71 (95% CI 0.53–0.94). Frailty was associated with increased mortality, after adjustment for age, wave and other patient characteristics. Patients were more frail in wave 1, and the effect of frailty was more pronounced in wave 1 vs wave 2. Conclusion Frailty is highly prevalent amongst patients of all ages admitted to SRFT with COVID-19. Higher scores of frailty are associated with increased mortality.
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Kareem, Semiu A., Idayatu Dere, Daniel T. Gungula, Fartisincha Peingurta Andrew, Abdullahi M. Saddiq, Elizabeth F. Adebayo, Vadlya T. Tame, Haruna M. Kefas, Japari Joseph, and David O. Patrick. "Synthesis and Characterization of Slow-Release Fertilizer Hydrogel Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper." Gels 7, no. 4 (December 13, 2021): 262. http://dx.doi.org/10.3390/gels7040262.
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In this study, biodegradable slow-release fertilizer (SRF) hydrogels were synthesized from hydroxyl propyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), glycerol and urea (SRF1) and HPMC, PVA, glycerol, urea and blended paper (SRF2). The fertilizer hydrogels were characterized by SEM, XRD and FTIR. The swelling capacity of the hydrogels in both distilled and tap water as well as their water retention capacity in sandy soil were evaluated. The hydrogels had good swelling capacity with maximum swelling ratio of 17.2 g/g and 15.6 g/g for SRF1 and SRF2 in distilled, and 14.4 g/g and 15.2 g/g in tap water, respectively. The water retention capacity of the hydrogels in sandy soil exhibited higher water retention when compared with soil without the (SRFs). The soil with the hydrogels was found to have higher water retention than the soil without the hydrogels. The slow-release profile of the hydrogels was also evaluated. The result suggested that the prepared fertilizer hydrogels has a good controlled release capacity. The blended paper component in SRF2 was observed to aid effective release of urea, with about 87.01% release in soil at 44 days compared to the pure urea which was about 97% release within 4 days. The addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed Schott’s second order model. The release kinetics of urea in water was best described by Kormeye Peppas, suggesting urea release to be by diffusion via the pores and channels of the SRF, which can be controlled by changing the swelling of the SRF. However, the release mechanism in soil is best described by first order kinetic model, suggesting that the release rate in soil is depended on concentration and probably on diffusion rate via the pores and channels of the SRF.
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Sampath, Namratha, and P. V. S. S. A. Parimala. "D-STATCOM Control using SRFT Method for PQ Improvement in a PV System." Regular issue 10, no. 8 (June 30, 2021): 113–19. http://dx.doi.org/10.35940/ijitee.h9261.0610821.
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The set of restrictions defined for a system's electrical characteristics so that the entire electrical system can function in the intended manner and without losses is known as power quality. Power quality issues such as transients, harmonics, voltage swell, sag, flicker, fluctuations, and power factor difficulties are becoming more common as power electronic devices become more widely used. The usage of a Distribution Static Compensator (D-STATCOM) to mitigate power quality issues is discussed in this study. In this case, D-STATCOM functions as a shunt active power filter to reduce harmonics caused by non-linear loads. The simulation studies on a PV-based Cascaded-H-Bridge Multi-Level Inverter i.e Solar PV and Cascaded H Bridge MLI are integrated using Selective Harmonic Elimination method with D-STATCOM injected at the load side to improve power quality are presented in this project. The Solar PV system is mathematically modelled using Boost regulator and P&O MPPT technique and to the D-STATCOM the controller is designed utilizing Synchronous Reference Frame Theory (SRFT) out of many control strategies for reactive power compensation, harmonic mitigation, and power factor enhancement as it is more accurate. A 2nd order low pass filter is employed at the load side to reduce the harmonics to some extent, and both 5-level and 7-level models are evaluated. MATLAB/SIMULINK is used for simulation.
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Sadeque, Md Golam, Zubaida Yusoff, and Mardeni Roslee. "A high-efficiency continuous class-F power amplifier design using simplified real frequency technique." Bulletin of Electrical Engineering and Informatics 9, no. 5 (October 1, 2020): 1924–32. http://dx.doi.org/10.11591/eei.v9i5.2227.
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The fourth-generation (4G) wireless communication has been deployed in many countries. However, there are still some problems such as spectrum crisis due to the increase of wireless mobile devices and servicing. Therefore, the fifth-generation (5G) communication system will be employed at some different spectrum other than 4G frequency band. The radio frequency power amplifier (RFPA) is the key component of the 5G system. In this paper, a broadband continuous class-F (CCF) RFPA is designed for the 5G frequency band from 3.3-4.3 GHz. The input and output matching network are designed using the simplified real frequency technique (SRFT). Using a 10W GaN CGH40010F Cree device, the efficiency of the RFPA achieved greater than 70.7% for the whole frequency band with a maximum of 81.5%. The output power and the gain are more than 40 dBm and 10 dB respectively
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Jin‐Ling, Zhang, Wang Hong‐Ze, Zheng Zhan‐Qi, and Zhu Xiong‐Zhi. "Research of SRFT improving and antenna broadband matching based on the IWO–LM algorithm." IET Microwaves, Antennas & Propagation 12, no. 15 (September 17, 2018): 2320–25. http://dx.doi.org/10.1049/iet-map.2018.5220.
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Hintzen, E., T. Vennemann, and W. Mathis. "Systematic design of output filters for audio class-D amplifiers via Simplified Real Frequency Technique." Advances in Radio Science 12 (November 10, 2014): 49–52. http://dx.doi.org/10.5194/ars-12-49-2014.
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Abstract. In this paper a new filter design concept is proposed and implemented which takes into account the complex loudspeaker impedance. By means of techniques of broadband matching, that has been successfully applied in radio technology, we are able to optimize the reconstruction filter to achieve an overall linear frequency response. Here, a passive filter network is inserted between source and load that matches the complex load impedance to the complex source impedance within a desired frequency range. The design and calculation of the filter is usually done using numerical approximation methods which are known as Real Frequency Techniques (RFT). A first approach to systematic design of reconstruction filters for class-D amplifiers is proposed, using the Simplified Real Frequency Technique (SRFT). Some fundamental considerations are introduced as well as the benefits and challenges of impedance matching between class-D amplifiers and loudspeakers. Current simulation data using MATLAB is presented and supports some first conclusions.
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Keitley, James, Timothy Lavin, Martin Punter, Jason McMinn, and Mark Kellett. "A COMPARISON OF ASSESSMENT, DIAGNOSIS AND TREATMENT OF PATIENTS WITH CEREBRAL VENOUS THROMBOSIS BEFORE AND AFTER INTRODUCTION OF A NEW POLICY AND GUIDELINE ACROSS GREATER MANCHESTER." Journal of Neurology, Neurosurgery & Psychiatry 86, no. 11 (October 14, 2015): e4.103-e4. http://dx.doi.org/10.1136/jnnp-2015-312379.191.
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BackgroundFrom June 2014, regional guidelines to transfer within 24 hours all radiologically confirmed cases of cerebral venous thrombosis (CVT) were implemented across Greater Manchester. This service review assesses the impact on assessment, diagnosis and treatment.MethodsWe prospectively recorded all CVT cases transferred into our unit between June 1st and November 30th 2014 (14 patients), and retrospectively reviewed the casenotes of patients admitted in 2012, 2013 and early 2014 (13 patients).ResultsMean number of days from diagnosis to transfer after guideline introduction was 0.4. More patients underwent fundoscopy (86% vs 77%), visual acuity (50% vs 27%), visual field (79% vs 69%) and otoscopy (29% vs 8%). Patients admitted to SRFT previously had shorter symptom to diagnosis, imaging, transfer, and treatment times.ConclusionsAfter guideline introduction we found a high level of compliance with time to transfer, with improvements in several aspects of clinical assessments. We expect that patients previously admitted to our centre were more unwell or already admitted for other reasons (e.g. neurosurgical) and therefore time from symptoms to diagnosis appears longer. We aim to extend the current evaluation to all patients in the region who weren't transferred to our centre to allow a more valid comparison.
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Mishra, Soumya, Sreejith Rajashekaran, Pavan Kalyan Mohan, Spoorthi Mathad Lokesh, Hemalatha Jyothinagaravaishya Ganiga, Santanu Kumar Dash, and Michele Roccotelli. "Implementation of an ADALINE-Based Adaptive Control Strategy for an LCLC-PV-DSTATCOM in Distribution System for Power Quality Improvement." Energies 16, no. 1 (December 28, 2022): 323. http://dx.doi.org/10.3390/en16010323.
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This study investigated the problem of controlling a three-phase three-wire photovoltaic (PV)-type distribution static compensator (DSTATCOM). In order to model, simulate, and control the system, the MATLAB/SIMULINK tool was used. Different controllers were applied to create switching pulses for the IGBT-based voltage source converter (VSC) for the mitigation of various power quality issues in the PV-DSTATCOM. Traditional control algorithms guarantee faultless execution or outcomes only for a restricted range of operating situations due to their present design. Alternative regulators depend on more resilient neural network and fuzzy logic algorithms that may be programmed to operate in a variety of settings. In this study, an adaptive linear neural network (ADALINE) was proposed to solve the control problem more efficiently than the existing methods. The ADALINE method was simulated and the results were compared with the results of the synchronous reference frame theory (SRFT), improved linear sinusoidal tracer (ILST), and backpropagation (BP) algorithms. The simulation results showed that the proposed ADALINE method outperformed the compared algorithms. In addition, the total harmonic distortions (THDs) of the source current were estimated under ideal grid voltage conditions based on IEEE-929 and IEEE-519 guidelines.
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Swaminathan, J., C. R. Bunt, B. Gilmore, and D. Jones. "Dissolution analysis to study release of Lactobacillus plantarum from silage inoculant prills." New Zealand Plant Protection 64 (January 8, 2011): 286. http://dx.doi.org/10.30843/nzpp.2011.64.5992.
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The quality of silage can be improved by addition of lactic acid bacteria (LAB) at the time of ensiling Rapid fermentation by fermentative LAB reduces water soluble carbohydrates to lactic acid The consequent rapid decrease in pH improves silage preservation and inhibits the growth of aerobic spoilage microorganisms For successful silage making it is essential that inoculants are delivered in a viable state and are released during silage making LAB can be formulated as prills for extended bacterial survival but the release characteristics from the prill will determine product utility In these experiments release characteristics of the LAB Lactobacillus plantarum contained in three types of prills (immediate release formulation (IRF) or sustained release formulations (SRF1 and SRF2)) were examined using a DIS 8000 Dissolution Apparatus to study in vitro release in two pH conditions At neutral pH IRF released >80 of live bacterial within 30 min while SRF1 and SRF2 released approximately 55 and 25 respectively Under acidic conditions (pH 4) release profiles were similar to those produced under neutral conditions from all formulations This study demonstrates the utility of dissolution analysis in selection of bacterial formulations
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Leite Cunha, Fernanda, Juscelina Arcanjo dos Santos, Paloma Carvalho Diniz, Lucas Amaral de Melo, and Nelson Venturin. "Uso de adubos de liberação lenta na produção de mudas de Handroanthus impetiginosus." Advances in Forestry Science 9, no. 4 (December 27, 2022): 1885–91. http://dx.doi.org/10.34062/afs.v9i4.13072.
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A espécie Handroanthus impetiginosus possui grande interesse econômico devido a qualidade da sua madeira. Visando entender e ampliar os conhecimentos sobre a sua formação de mudas com qualidade da espécie, foi estudado a eficiência e as doses adequadas de dois adubos de liberação lenta na produção de mudas de Handroanthus impetiginosus. O experimento foi conduzido em delineamento em blocos casualizados, em fatorial (2x5). Foram avaliados dois adubos (SRF1 e o SRF2) em cinco doses (0, 3, 6, 9, 12 kg dm-³). Foram mensurados a altura, diâmetro de coleto, H/SD, massa seca da parte aérea, do sistema radicular e total, e o Índice de Qualidade de Dickson. Para cada variável foi calculado a dose máxima de eficiência técnica (MDTE). Realizou-se a análise de variância e a comparação de médias pelo teste Tukey para os dois adubos utilizados e análise de regressão das médias para as doses utilizadas. Todas as análises foram realizadas utilizando o software R. Todas as variáveis apresentaram crescimento quadrático positivo. Os resultados deste estudo indicam que ambos os adubos são adequados para produção de mudas de Handroanthus impetiginosus, nas MDTE de 11,65 kg dm-3 para SRF1 e 9,19 kg dm-3 para SRF2.
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Picart, Stacey. "Auditing compliance with nice clinical guideline: Quality standard for breast cancer (Aug 2011) at Salford Royal Foundation Trust (SRFT)." International Journal of Surgery 11, no. 8 (October 2013): 604. http://dx.doi.org/10.1016/j.ijsu.2013.06.095.
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Akbar, Wahyu Nusantara, and Bagus Wiyono. "Evaluation of rock slope using q-slope, limit equilibrium and failure probability at andesite mine of Sidomulyo Village." Indonesian Mining Journal 26, no. 1 (2023): 1–17. http://dx.doi.org/10.30556/imj.vol26.no1.2023.1329.
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For an open pit mine, the rock slope stability is one of the major significant challenges at every stage in the operation. It became a concern from the planning until the mining closure. Mining activities in the research location have entered the mining closure phase and produced the final slope that consists of 4 single slopes with an overall slope height of 65m and an angle of 62° that its stability is not yet known. The actual overall slope has discontinuities which affect the potential for failure. Most of the methods used in geotechnical practice for estimating slope stability are based on the traditional limit equilibrium methods. On the other side, very few empirical techniques exist to assess the slope stability. The empirical method of the Q-Slope is a relatively new methodology for assessing the slope stability in terrains built from rock masses. This method was developed over the last decade by Barton and Bar (2015), with modifications to the original Q-System for application in rock slope stability through the parameter of RQD, Jn, Jr, Ja, O-Factor, Jwice, SRFa, SRFb and SRFc. The stability analysis by Q-Slope method has resulted the slope in stable condition because the value of βQ-Slope > βSlope. The factor of safety limit equilibrium method and probability of failure used the actual geometry and Q-Slope geometry is known in stable condition because it fulfils acceptance criteria with FoS ≥ 1.1 and PoF ≤ 37,5% according to the regulation Ministry of Energy and Mineral Resources Decree 1827/K/30/MEM/2018.
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Laval, Jean-Paul, and Richard Mayet. "High-temperature monoclinic α-SrHfF6, and isostructural α-SrZrF6: associating Hf2F12 bipolyhedra and SrF8 snub disphenoids." Acta Crystallographica Section C Structural Chemistry 74, no. 2 (January 30, 2018): 229–35. http://dx.doi.org/10.1107/s2053229618001110.
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The structure of the high-temperature monoclinic variety α-SrHfF6 (strontium hafnium hexafluoride) [and of isostructural α-SrZrF6 (strontium zirconium hexafluoride)] associates Hf2F12 bipolyhedra and SrF8 snub disphenoids, forming zigzag twisted [SrF6] n layers. The distribution of the Hf and Sr polyhedra forms a three-dimensional framework which can be related to the family of anion-excess ReO3-related superstructures. α-SrHfF6 corresponds to a new ABX 6 type and is compared to the other main families already described. A partial amorphization of this structure is observed in samples quenched from the melt.
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García-Calderón, Clara B., Josep Casadesús, and Francisco Ramos-Morales. "Rcs and PhoPQ Regulatory Overlap in the Control of Salmonella enterica Virulence." Journal of Bacteriology 189, no. 18 (July 6, 2007): 6635–44. http://dx.doi.org/10.1128/jb.00640-07.
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ABSTRACT Genetic screens based on the use of MudJ-generated lac fusions permitted the identification of novel genes regulated by the Rcs signal transduction system in Salmonella enterica serovar Typhimurium. Besides genes that are also found in the Escherichia coli genome, our screens identified Salmonella-specific genes regulated by RcsB, including bapA, siiE, srfA, and srfB. Here we show that the srfABC operon is negatively regulated by RcsB and by PhoP. In vivo studies using mutants with constitutive activation of the Rcs and/or PhoPQ system suggested that there is an overlap between these regulatory systems in the control of Salmonella virulence.
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Borja Bernal, Cesar, Ricardo Laín, Luis Jordá, Miguel Cano, Adrián Riquelme, and Roberto Tomás. "Stability Assessment of Rock Slopes Using the Q-Slope Classification System: A Reliability Analysis Employing Case Studies in Ecuador." Applied Sciences 13, no. 13 (June 22, 2023): 7399. http://dx.doi.org/10.3390/app13137399.
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Q-slope is one of the most recent empirical geomechanical classification systems and the least studied in South America. This study aims to expand the knowledge base regarding the Q-slope geomechanical method and demonstrate its applicability and reliability in rock slopes of Andean countries, such as Ecuador. To this end, thirty rocky slopes have been characterized considering (1) the physical visual approach—geographic location, climate, lithology, alteration, and stability (to obtain values of Jr, Ja, Jwice, and SRFa)—and (2) geomechanical stations and kinematic analysis (for the determination of the type of failure, Jn, O-factor, and SRFc for Q-slope). Field data were collected in contrasting environments (coastal, mountain, and forest), and different failure modes were considered (planar, wedge, block, and flexural topplings) to better understand the method. The results and main contributions of this research are (i) verifying the applicability of the Jwice parameters in different climatic settings and (ii) validating the Q-slope method by applying a confusion matrix to evaluate its reliability for slope stability assessment. The overall accuracy obtained is 80%, placing the Q-slope geomechanical method in the highest evaluation quartile and thus classifying it as very good for slope characterization.
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Atef, Mohammed, Shokry Nada, Abdu Gumaei, and Ashraf S. Nawar. "On Three Types of Soft Rough Covering-Based Fuzzy Sets." Journal of Mathematics 2021 (January 18, 2021): 1–9. http://dx.doi.org/10.1155/2021/6677298.
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Recently, the concept of a soft rough fuzzy covering (briefly, SRFC) by means of soft neighborhoods was defined and their properties were studied by Zhan’s model. As a generalization of Zhan’s method and in order to increase the lower approximation and decrease the upper approximation, the present work aims to define the complementary soft neighborhood and hence three types of soft rough fuzzy covering models (briefly, 1-SRFC, 2-SRFC, and 3-SRFC) are proposed. We discuss their axiomatic properties. According to these results, we investigate three types of fuzzy soft measure degrees (briefly, 1-SMD, 2-SMD, and 3-SMD). Also, three kinds of ψ -soft rough fuzzy coverings (briefly, 1- ψ -SRFC, 2- ψ -SRFC, and 3- ψ -SRFC) and three kinds of D -soft rough fuzzy coverings (briefly, 1- D -SRFC, 2- D -SRFC, and 3- D -SRFC) are discussed and some of their properties are studied. Finally, the relationships among these three models and Zhan’s model are presented.
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Hayashi, Kentaro, Taku Ohsawa, Kazuo Kobayashi, Naotake Ogasawara, and Mitsuo Ogura. "The H2O2 Stress-Responsive Regulator PerR Positively Regulates srfA Expression in Bacillus subtilis." Journal of Bacteriology 187, no. 19 (October 1, 2005): 6659–67. http://dx.doi.org/10.1128/jb.187.19.6659-6667.2005.
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ABSTRACT srfA is an operon required for the synthesis of surfactin and the development of genetic competence in Bacillus subtilis. We observed that the expression of srfA is downregulated upon treatment with H2O2. Thus, we examined the involvement of several oxidative stress-responsive transcription factors in srfA expression. Our DNA microarray analysis revealed that the H2O2 stress-responsive regulator PerR is required for srfA expression. This was confirmed by lacZ fusion analysis. A ComX feeding assay and epistatic analyses revealed that the role of PerR in srfA expression is independent of other known regulators of srfA expression, namely, comQXP, rapC, and spx. Gel mobility shift and footprint assays revealed that PerR binds directly to two tandemly arranged noncanonical PerR boxes located in the upstream promoter region of srfA. A transcriptional srfA-lacZ fusion lacking both PerR boxes showed diminished and PerR-independent expression, indicating that the PerR boxes we identified function as positive cis elements for srfA transcription.
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Chang, Edward, James Philpot, and George Swales. "Do Socially Responsible Mutual Funds Measure Up?" Journal of Finance Issues 5, no. 2 (December 31, 2007): 236–45. http://dx.doi.org/10.58886/jfi.v5i2.2629.
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This abstract was created post-production by the JFI Editorial Board. This paper examines characteristics, risk and performance measures of all available socially responsible funds (hereafter SRFs) in the U.S. mutual fund industry. In this study, SRFs include actively-managed funds and index funds. The two issues to be addressed are: (1) Do SRFs as a whole perform as well as the average of all mutual funds in their respective categories? and (2) Do actively-managed SRFs outperform index SRFs? The authors of this study find SRFs, as a whole, when compared with the average of all mutual funds in the same category, exhibit LOWER measures in most categories. "Do good" SRFs, with the exception of some bond categories, did not perform as well as other mutual funds in their own categories over the past fifteen years. Actively-managed SRFs as a whole, compared with index SRFs, appear to exhibit mostly higher measures over the three- and five-year periods.
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Keith, NiCole R., Daniel O. Clark, Timothy E. Stump, Douglas K. Miller, and Christopher M. Callahan. "Validity and Reliability of the Self-Reported Physical Fitness (SRFit) Survey." Journal of Physical Activity and Health 11, no. 4 (May 2014): 853–59. http://dx.doi.org/10.1123/jpah.2012-0264.
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Background:An accurate physical fitness survey could be useful in research and clinical care.Purpose:To estimate the validity and reliability of a Self-Reported Fitness (SRFit) survey; an instrument that estimates muscular fitness, flexibility, cardiovascular endurance, BMI, and body composition (BC) in adults ≥ 40 years of age.Methods:201 participants completed the SF-36 Physical Function Subscale, International Physical Activity Questionnaire (IPAQ), Older Adults’ Desire for Physical Competence Scale (Rejeski), the SRFit survey, and the Rikli and Jones Senior Fitness Test. BC, height and weight were measured. SRFit survey items described BC, BMI, and Senior Fitness Test movements. Correlations between the Senior Fitness Test and the SRFit survey assessed concurrent validity. Cronbach’s Alpha measured internal consistency within each SRFit domain. SRFit domain scores were compared with SF-36, IPAQ, and Rejeski survey scores to assess construct validity. Intraclass correlations evaluated test-retest reliability.Results:Correlations between SRFit and the Senior Fitness Test domains ranged from 0.35 to 0.79. Cronbach’s Alpha scores were .75 to .85. Correlations between SRFit and other survey scores were –0.23 to 0.72 and in the expected direction. Intraclass correlation coefficients were 0.79 to 0.93. All P-values were 0.001.Conclusion:Initial evaluation supports the SRFit survey’s validity and reliability.
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Sato, Takao, Sonoka Goto, Yusuke Ohta, Yuji Taya, Sho Yuasa, Minoru Takahashi, Masaaki Okabe, and Yoshifusa Aizawa. "Utility of Saline-Induced Resting Full-Cycle Ratio Compared with Resting Full-Cycle Ratio and Fractional Flow Reserve." Journal of Interventional Cardiology 2020 (April 7, 2020): 1–7. http://dx.doi.org/10.1155/2020/5787439.
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Background. The saline-induced distal coronary pressure/aortic pressure ratio predicted fractional flow reserve (FFR). The resting full-cycle ratio (RFR) represents the maximal relative pressure difference in a cardiac cycle. Therefore, the present study aimed to compare the results of saline-induced RFR (sRFR) with FFR. Methods. Seventy consecutive lesions with only moderate stenosis were included. The FFR, RFR, and sRFR values were compared. The sRFR was assessed using an intracoronary bolus infusion of saline (2 mL/s) for five heartbeats. The FFR was obtained after an intravenous injection of papaverine. Results. Overall, the FFR, sRFR, and RFR values were 0.78 ± 0.12, 0.79 ± 0.13, and 0.83 ± 0.14, respectively. With regard to anatomical morphology were 40, 18, and 12 cases of focal, diffuse, and tandem lesion. There was a significant correlation between the sRFR and FFR (R = 0.96, p<0.01). There were also significant correlations between the sRFR and FFR in the left coronary and right coronary artery (R = 0.95, p<0.01 and R = 0.98, p<0.01). Furthermore, significant correlations between sRFR and FFR were observed in not only focal but also in nonfocal lesion including tandem and diffuse lesions (R = 0.93, p<0.01 and R = 0.97, p<0.01). A close agreement on FFR and sRFR was shown using the Bland–Altman analysis (95% CI of agreement: −0.08–0.07). In the receiver operating characteristic curve analysis, the cutoff value of sRFR to predict an FFR of 0.80 was 0.81 (area under curve, 0.97; sensitivity 90.6%; and specificity 98.2%). Conclusion. The sRFR can accurately and safely predict the FFR and might be effective for diagnosing ischemia.
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Setyawan, Fariz, and Afit Istiandaru. "Implementasi Self Regulated Flipped Classroom pada Mata Kuliah Kalkulus." Journal of Medives : Journal of Mathematics Education IKIP Veteran Semarang 3, no. 1 (January 4, 2019): 119. http://dx.doi.org/10.31331/medivesveteran.v3i1.699.
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Target yang ingin dicapai dalam penelitian ini adalah mendeskripsikan sejauh mana pendekatan SRFC mampu membuat mahasiswa program studi pendidikan matematika Universitas Ahmad Dahlan (UAD) belajar mandiri. Paradigma baru yang berkembang di perguruan tinggi menuntut pembelajaran harus mampu memandirikan mahasiswa dalam belajar (self regulated learning). Pendekatan pembelajaran yang secara teori berpotensi mampu memfasilitasi belajar mandiri adalah pendekatan SRFC. Penelitian ini menggunakan pendekatan deskriptif kualitatif. Bedasarkan hasil penelitian, penulis berharap pendekatan Self Regulated Flipped Classroom (SRFC) tidak hanya diterapkan pada mata kuliah Kalkulus diferensial saja melainkan dapat menjadi rujukan pada mata kuliah lain. Adapun pelaksanaan SRFC dari sisi kognitif masih memiliki kekurangan dimana mahasiswa belum terlibat aktif dalam melakukan refleksi berpikir selama pembelajaran, namun mahasiswa lebih terlibat aktif dalam sisi intepretasi. Selain itu, motivasi dan perilaku mahasiswa cenderung positif selama menggunakan pendekatan pembelajaran SRFC. Hal ini dikarenakan adanya dukungan dari pengajar dan teman sejawat serta interaksi selama pembelajaran berlangsung.
Kata kunci: kalkulus, SRFC, kemandirian belajar.
ABSTRACT
This research aims to describe the SRFC approach through self regulated indicators and the result of the study of college students in Universitas Ahmad Dahlan. The new paradigm related to Higher Level Education strive for students whom can independently get their own knowledge. SRFC has a potential method to make the students study independently. This research is using qualitative descriptive approach. Based on the result, the author recommend to used SRFC approach not only implemented in Calculus Diferential course but also the other subject. As far as the SRFC activities, cognitive domain hasn’t actively contributed in teaching and learning process because the students havent involve their reflection in learning the subject. However, their intepretation of the subject is actively involved better. In addition, the motivation and the attitude of the students is positive in using SRFC approach. It is because there are support from the teacher and their collegaues and their interaction while they were studying.
Keywords: calculus, self-regulated learning, mastery learning.
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Priyono, Joko, Raden Sutriono, and Zaenal Arifin. "Evaluation for the Potential Use of Silicate Rocks from FourVolcanoes in Indonesia as Fertilizer and Soil Ameliorant." JOURNAL OF TROPICAL SOILS 14, no. 1 (January 1, 2009): 1. http://dx.doi.org/10.5400/jts.2009.v14i1.1-8.
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Silicate rocks, the abundant plant nutrient source in Indonesia, have not been evaluated for use as a fertilizer/and soil ameliorant. This research was aimed to identify (1) mineral and elemental compositions of silicate rocks originated from Galunggung, Kelud, Tambora, and Rinjani Volcanoes and (2) soil properties determining dissolution rate of plant nutrients from the silicate rock fertilizers (SRFs). The rocks were ground with a ball mill for 10 min providing SRFs with medians of particle size of 30 – 50 mm. Each SRF was added to 6 soils from West Java, East Java, and Lombok Island at a rate equivalent to 20 t ha-1, incubated for 28 days in a laboratory condition. Results indicate that adding SRFs clearly increased soil pH with negligible effect on soil salinity. Adding SRFs also increased quantity of citric-oxalic-extractable plant nutrients (Ca, K, Zn, and Cu) and activity of soil micro-organisms. Dissolution of plant nutrients from the SRFs in the soils was mainly determined by combination factors of C-organic content and pH of soils before application of the SRFs. It was concluded that SRFs originated from those volcanoes may be used as a plant-multi nutrient source and a remedial agent for acidic and biologically degraded soils. However, the true effectiveness of SRFs for those uses needs to be further tested under various soil-plant systems.
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Saha, Rahul, Ganesan Geetha, Gulshan Kumar, William J. Buchanan, and Tai-hoon Kim. "A Secure Random Number Generator with Immunity and Propagation Characteristics for Cryptography Functions." Applied Sciences 11, no. 17 (August 31, 2021): 8073. http://dx.doi.org/10.3390/app11178073.
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Cryptographic algorithms and functions should possess some of the important functional requirements such as: non-linearity, resiliency, propagation and immunity. Several previous studies were executed to analyze these characteristics of the cryptographic functions specifically for Boolean and symmetric functions. Randomness is a requirement in present cryptographic algorithms and therefore, Symmetric Random Function Generator (SRFG) has been developed. In this paper, we have analysed SRFG based on propagation feature and immunity. Moreover, NIST recommended statistical suite has been tested on SRFG outputs. The test values show that SRFG possess some of the useful randomness properties for cryptographic applications such as individual frequency in a sequence and block-based frequency, long run of sequences, oscillations from 0 to 1 or vice-versa, patterns of bits, gap bits between two patterns, and overlapping block bits. We also analyze the comparison of SRFG and some existing random number generators. We observe that SRFG is efficient for cryptographic operations in terms of propagation and immunity features.
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Kim, Yeon-Gil, Jin-Hong Kim, and Kyung-Jin Kim. "Crystal Structure of the Salmonella enterica Serovar Typhimurium Virulence Factor SrfJ, a Glycoside Hydrolase Family Enzyme." Journal of Bacteriology 191, no. 21 (August 28, 2009): 6550–54. http://dx.doi.org/10.1128/jb.00641-09.
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ABSTRACT To cause infection, Salmonella enterica serovar Typhimurium uses type III secretion systems, which are encoded on two Salmonella pathogenicity islands, SPI-1 and SPI-2, the latter of which is thought to play a crucial role in bacterial proliferation in Salmonella-containing vacuoles (SCVs) after invading cells. S. Typhimurium SrfJ, located outside SPI-2, is also known to be involved in Salmonella pathogenicity and has high amino acid sequence homology with human lysosomal glucosylceramidase (GlcCerase). We present the first crystal structure of SrfJ at a resolution of 1.8 Å. The overall fold of SrfJ shares high structure similarities with that of human GlcCerase, comprising two distinctive domains: a (β/α)8-barrel catalytic domain and a β-sandwich domain. As in human GlcCerase, the pocket-shaped active site of SrfJ is located on the C-terminal side of the barrel, and two conserved glutamic acid residues are used for the enzyme catalysis. Moreover, a glycerol-bound form of SrfJ reveals that the glucose ring moiety of the substrate might similarly bind to the enzyme as to human GlcCerase, suggesting that SrfJ might function as a glycoside hydrolase. Although some structural differences are observed between SrfJ and human GlcCerase in the substrate entrance of the active site, we speculate that, based on the high structural similarities to human GlcCerase in the overall fold and the active-site environment, SrfJ might have a GlcCerase activity and use the activity to enhance Salmonella virulence by modifying SCV membrane lipids.
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Lei, Zijian, and Liang Lan. "Improved Subsampled Randomized Hadamard Transform for Linear SVM." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 04 (April 3, 2020): 4519–26. http://dx.doi.org/10.1609/aaai.v34i04.5880.
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Subsampled Randomized Hadamard Transform (SRHT), a popular random projection method that can efficiently project a d-dimensional data into r-dimensional space (r ≪ d) in O(dlog(d)) time, has been widely used to address the challenge of high-dimensionality in machine learning. SRHT works by rotating the input data matrix X ∈ ℝn × d by Randomized Walsh-Hadamard Transform followed with a subsequent uniform column sampling on the rotated matrix. Despite the advantages of SRHT, one limitation of SRHT is that it generates the new low-dimensional embedding without considering any specific properties of a given dataset. Therefore, this data-independent random projection method may result in inferior and unstable performance when used for a particular machine learning task, e.g., classification. To overcome this limitation, we analyze the effect of using SRHT for random projection in the context of linear SVM classification. Based on our analysis, we propose importance sampling and deterministic top-r sampling to produce effective low-dimensional embedding instead of uniform sampling SRHT. In addition, we also proposed a new supervised non-uniform sampling method. Our experimental results have demonstrated that our proposed methods can achieve higher classification accuracies than SRHT and other random projection methods on six real-life datasets.
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Drexler, Richard, Felix Fröschle, Christopher Predel, Berit Sturm, Klara Ustorf, Louisa Lehner, Jara Janzen, et al. "Establishing a student-run free clinic in a major city in Northern Europe: a 1-year experience from Hamburg, Germany." Journal of Public Health 42, no. 4 (December 16, 2019): 793–98. http://dx.doi.org/10.1093/pubmed/fdz165.
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Abstract Background Student-Run Free Clinics (SRFCs) have been an integral part of US medical schools since the 1960s and provide health care to underserved populations. In 2018, we established an SRFC in Hamburg, Germany, a major city in Northern Europe. The aim of this study was to describe the central problems and to investigate the usefulness of an SRFC in a country with free access to medical care, such as Germany. Methods All consecutive patients treated at the SRFC Hamburg between February 2018 and March 2019 that consented to this study were analyzed regarding clinical characteristics, diagnosis, readmission rate and country of origin. Results Between February 2018 and March 2019, 229 patients were treated at the SRFC in Hamburg. The patients came from 33 different countries with a majority (n = 206, 90%) from countries inside the European Union. The most common reasons for visiting the SRFC were infections (23.2%), acute or chronic wounds (13.5%) and fractures (6.3%). Conclusion Our multicultural patients suffer mainly from infections and traumatological and dermatological diseases. We find similarities to published Canadian SRFC patient cohorts but differences in diseases and treatment modalities compared to US SRFCs. Importantly, we demonstrate the relevance and necessity of the SRFC in a major city in Northern Europe.
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Cecchetto, Giovanni, Veronique Mosseri, Bruno De Bernardi, Pierre Helardot, Tom Monclair, Elisa Costa, Ernst Horcher, et al. "Surgical Risk Factors in Primary Surgery for Localized Neuroblastoma: The LNESG1 Study of the European International Society of Pediatric Oncology Neuroblastoma Group." Journal of Clinical Oncology 23, no. 33 (November 20, 2005): 8483–89. http://dx.doi.org/10.1200/jco.2005.02.4661.
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Purpose Although tumor resection is the mainstay of treatment for localized neuroblastoma, there are no established guidelines indicating which patients should be operated on immediately and which should undergo surgery after tumor reduction with chemotherapy. In an effort to develop such guidelines, the LNESG1 study defined surgical risk factors (SRFs) based on the imaging characteristics. Patients and Methods A total of 905 patients with suspected localized neuroblastoma were registered by 10 European countries between January 1995 and October 1999; 811 of 905 patients were eligible for this analysis. Results Information on SRFs was obtained for 719 of 811 patients; 367 without and 352 with SRFs. Of these 719 patients, 201 patients (four without and 197 with SRFs) underwent biopsy only. An attempt at tumor excision was made in 518 patients: 363 of 367 patients without and 155 of 352 patients with SRFs (98.9% v 44.0%). Complete excision was achieved in 271 of 363 patients without and in 72 of 155 patients with SRF (74.6% v 46.4%), near-complete excision was achieved in 81 and 61 patients (22.3% v 39.3%), and incomplete excision was achieved in 11 and 22 patients (3.0% v 14.2%), respectively. There were two surgery-related deaths. Nonfatal surgery-related complications occurred in 45 of 518 patients (8.7%) and were less frequent in patients without SRFs (5.0% v 17.4%). Associated surgical procedures were also less frequent in patients without SRFs (1.6% v 9.7%). Conclusion The adoption of SRFs as predictors of adverse surgical outcome was validated because their presence was associated with lower complete resection rate and greater risk of surgery-related complications. Additional studies aiming to better define the surgical approach to localized neuroblastoma are warranted.
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Sairenji, Tomoko, Amanda Kost, Jacob Prunuske, Andrea L. Wendling, Christopher P. Morley, Molly E. Polverento, Virginia Young, and Julie P. Phillips. "The Impact of Family Medicine Interest Groups and Student-Run Free Clinics on Primary Care Career Choice: A Narrative Synthesis." Family Medicine 54, no. 7 (July 5, 2022): 531–35. http://dx.doi.org/10.22454/fammed.2022.436125.
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Background and Objectives: Student-directed activities such as family medicine interest groups (FMIG) and student-run free clinics (SRFC) have been examined to discover their impact on entry into family medicine and primary care. The objective of this review was to synthesize study results to better incorporate and optimize these activities to support family medicine and primary care choice. Methods: We conducted a comprehensive literature search using PubMed, Scopus, and CINAHL to identify all English-language research articles on FMIG and SRFC. We examined how participation relates to entry into family medicine and primary care specialties. Exclusion criteria were nonresearch articles, review articles, and research conducted outside the United States, Canada, Australia, and New Zealand. We used a 16-point quality rubric to evaluate 18 (11 FMIG, seven SRFC) articles that met our criteria. Results: Of the nine articles that examined whether FMIG participation impacted entry into family medicine, five papers noted a positive relationship, one paper noted unclear correlation, and three papers noted that FMIG did not impact entry into family medicine. Of the seven articles about SRFC, only one showed a positive relationship between SRFC activity and entry into primary care. Conclusions: Larger-scale and higher quality studies are necessary to determine the impact of FMIG and SRFC on entry into family medicine and primary care. However, available evidence supports that FMIG participation is positively associated with family medicine career choice. In contrast, SRFC participation is not clearly associated with primary care career choice.
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Chang, C. Edward, Thomas M. Krueger, and H. Doug Witte. "Saving green while going green." Managerial Finance 45, no. 1 (January 14, 2019): 21–35. http://dx.doi.org/10.1108/mf-03-2018-0095.
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Purpose The purpose of this paper is to examine the operating characteristics as well as risk and performance measures of all available self-proclaimed socially responsible funds (hereafter SRFs) in the USA over the ten-year (2007–2016) period. The first research question addressed is: Do SRFs perform as well as the average of all mutual funds in their respective categories? The second research question addressed is: Are SRF expense ratios correlated with fund performance? Design/methodology/approach This study analyzes all socially responsible equity mutual funds, as self-reported to Morningstar. This paper empirically compares operating characteristics and performance measures of SRFs relative to category averages in the US mutual fund industry. Operating characteristics include expense ratios and annual turnover rates. Performance measures include conventional return, risk and risk-adjusted return measures. Findings Although prior research suggests that socially responsible investing (SRI) indexes and SRI-friendly stocks have favorable returns, this study finds that these self-proclaimed SRFs underperform the average of all mutual funds in matched equity categories. However, this study demonstrates that a simple filter based on expense ratios can identify those SRFs that will enable investors to do quite well while doing good. Originality/value The contribution of this paper is twofold. First, the authors report that self-proclaimed SRFs, as a whole, have not generated competitive returns relative to other mutual funds in the same categories over the past ten years. This result contradicts the notion that socially responsible investors do not give up return performance when investing with their conscience. Second, the authors find that those SRFs with expense ratios in the lowest quartile of their respective category have significantly higher risk-adjusted returns and significantly lower turnover than category averages. Thus, by focusing on SRFs with low-expense ratios, socially responsible investors can do quite well while doing good.
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LoBue, Vanessa, and Judy S. DeLoache. "On the detection of emotional facial expressions: Are girls really better than boys?" Behavioral and Brain Sciences 32, no. 5 (October 2009): 397–98. http://dx.doi.org/10.1017/s0140525x09990161.
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AbstractOne facet of Vigil's socio-relational framework of expressive behaviors (SRFB) suggests that females are more sensitive to facial expressions than are males, and should detect facial expressions more quickly. A re-examination of recent research with children demonstrates that girls do detect various facial expressions more quickly than do boys. Although this provides support for SRFB, further examination of SRFB in children would lend important support this evolutionary-based theory.
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Wang, Xiaolei, Feng Guo, Peng Tian, Shuangen Yu, Chun-Xu Xue, Wei Wang, Jiaguang Xiao, and Wentao Niu. "Flammeovirga agarivorans sp. nov., an agar-digesting marine bacterium isolated from surface seawater." International Journal of Systematic and Evolutionary Microbiology 70, no. 12 (December 1, 2020): 6060–66. http://dx.doi.org/10.1099/ijsem.0.004497.
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A Gram-stain-negative, aerobic, gliding, reddish-orange-coloured, rod-shaped strain, designated SR4T, was isolated from surface seawater sampled at Luhuitou fringing reef (South China Sea). Phylogenetic analyses based on the 16S rRNA gene, phylogenomic analysis of single-copy gene families and whole genome data affiliated it to the genus Flammeovirga . It was most closely related to Flammeovirga yaeyamensis NBRC 100898T (97.99 % 16S rRNA gene similarity). The genome average nucleotide identity and DNA–DNA relatedness values between strain SR4T and its reference strains were less than 74.2 and 16.3 %, respectively. Growth occurred at 20–35 °C (optimum, 28 °C), pH 6.0–9.0 (optimum, pH 7.0) and in the presence of 1–6 % (w/v) NaCl (optimum, 2–4 %). The dominant fatty acids were C16 : 0, iso-C15 : 0 and C20 : 4 ω6,9,12,15c. The polar lipid profile of strain SR4T comprised phosphatidylethanolamine, two glycolipids, two aminophospholipids and three unidentified lipids. The major respiratory quinone was MK-7. The DNA G+C content of strain SR4T was 34.20 mol%. On the basis of the polyphasic evidence, strain SR4T is proposed as representing a novel species of the genus Flammeovirga , for which the name Flammeovirga agarivorans sp. nov. is proposed. The type strain is SR4T (=KCTC 82075T=MCCC 1A17137T).
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Xiong, Jie, Yu Guo, Lu-yi Li, Hang Hu, Xin-lan Qu, Xi-zhen Sun, Sheng-hua Liu, and Hui Wang. "A Herbal Composition of Semen Hoveniae, Radix Puerariae, and Fructus Schisandrae Shows Potent Protective Effects on Acute Alcoholic Intoxication in Rodent Models." Evidence-Based Complementary and Alternative Medicine 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/638197.
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This study is designed to evaluate the effects of a herbal composition of Semen Hoveniae, Radix Puerariae and Fructus Schisandrae (SRF) against acute alcoholic intoxication. The animals were treated with SRF extract (SRFE) for 14 days, and ethanol was conducted subsequent to the final treatment. The effects of SRFE on righting reflex, inebriety rates, kinetic parameters of blood ethanol and acetaldehyde were determined. In addition; levels of alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH), the activities of cytochrome P450 2E1 (CYP2E1), selected antioxidative enzymes, and the contents of malonaldehyde (MDA) were measured. SRFE-pretreated rodents exhibited lower rates of intoxication, longer times to loss of righting reflex, and shortened times to recovery of righting reflex than in controls. The peak concentrations and area under the time-concentration curves were lower in the pretreated animals than in controls, which corresponded to higher levels of ADH and ALDH in both gastrointestines and livers of the SRFE-treated animals. The activities of CYP2E1 were lower in SRFE-pretreated animals, which also exhibited higher activities of some antioxidant enzymes and lower hepatic MDA levels. These findings suggest that the anti-inebriation effects of SRFE may involve inhibition of ethanol absorption, promotion of ethanol metabolism, and enhancing hepatic anti-oxidative functions.
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Tsai, Wen-Tien. "Perspectives on the Promotion of Solid Recovered Fuels in Taiwan." Energies 16, no. 7 (March 23, 2023): 2944. http://dx.doi.org/10.3390/en16072944.
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Due to the economic inefficiency of material recycling of general industrial waste and urban waste, the use of solid recovered fuels (SRFs) not only mitigates the environmental loadings from waste incineration plants and sanitary landfills but also creates green electricity and/or heat and thus reduces the use of fossil fuels. In this regard, the Taiwan government formulated the “Solid Recovered Fuel Manufacturing Guidelines and Quality Standards” in 2020 to ensure the manufacturing quality of SRFs. This paper focused on the status of waste management and energy supply, the current regulations for adopting SRFs, and the challenges in the development of SRFs from the viewpoints (or life cycle) of the environmental, economic, and engineering (or technological) characters in Taiwan. Based on the database of the official handbook/yearbook, the energy supply from indigenous biomass and waste was 1678.7 × 103 kiloliters of oil equivalent (KLOE) in 2021, which only accounted for about 1.2% of the total energy supply. Obviously, available indigenous biomass and waste for producing SRFs were mostly from waste wood, sugarcane bagasse, and mixtures containing wood/paper. Finally, some suggestions for the increasing use of SRFs in the energy and industrial sectors were addressed to keep in step with the sustainable development goals (SDGs) in 2030, especially in the mitigation of GHG emissions.
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Zheng, Lihe, Jianbin Zhao, Yangxiao Wang, Weichao Chen, Fangfang Ruan, Hui Lin, Yanyan Xue, et al. "Mid-IR Optical Property of Dy:CaF2-SrF2 Crystal Fabricated by Multicrucible Temperature Gradient Technology." Crystals 11, no. 8 (July 31, 2021): 907. http://dx.doi.org/10.3390/cryst11080907.
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Dy3+-doped CaF2-SrF2 crystals with various Dy3+ dopant concentrations were synthesized by multicrucible temperature gradient technology (MC-TGT). Dy:CaF2-SrF2 crystals were fluorite structured and crystallized in cubic Fm3¯m space group, as characterized by X-ray diffraction. The crystallographic site concentration was calculated from the measured density by Archimedes’ hydrostatic weighing principle. The optical transmission reached over 90% with a sample thickness of 1.0 mm. The Sellmeier dispersion formula was obtained following the measured refractive index in a mid-IR range of 1.7–11 μm. Absorption coefficients of 6.06 cm−1 and 12.71 cm−1 were obtained at 804 nm and 1094 nm in 15% Dy:CaF2-SrF2 crystal. The fluorescence spectra of 15 at.% Dy:CaF2-SrF2 showed the strongest wavelength peak at 2919 nm with a full width at half maximum (FWHM) of 267 nm under an excitation wavelength of 808 nm. The fluorescence lifetimes were illustrated for different Dy3+ dopant levels of 5%, 10% and 15%. The results indicate that the Dy:CaF2-SrF2 crystal is a promising candidate for compact mid-IR lasers.
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Aguilera-Herce, Julia, Concepción Panadero-Medianero, María Antonia Sánchez-Romero, Roberto Balbontín, Joaquín Bernal-Bayard, and Francisco Ramos-Morales. "Salmonella Type III Secretion Effector SrfJ: A Glucosylceramidase Affecting the Lipidome and the Transcriptome of Mammalian Host Cells." International Journal of Molecular Sciences 24, no. 9 (May 7, 2023): 8403. http://dx.doi.org/10.3390/ijms24098403.
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Type III secretion systems are found in many Gram-negative pathogens and symbionts of animals and plants. Salmonella enterica has two type III secretion systems associated with virulence, one involved in the invasion of host cells and another involved in maintaining an appropriate intracellular niche. SrfJ is an effector of the second type III secretion system. In this study, we explored the biochemical function of SrfJ and the consequences for mammalian host cells of the expression of this S. enterica effector. Our experiments suggest that SrfJ is a glucosylceramidase that alters the lipidome and the transcriptome of host cells, both when expressed alone in epithelial cells and when translocated into macrophages in the context of Salmonella infection. We were able to identify seventeen lipids with higher levels and six lipids with lower levels in the presence of SrfJ. Analysis of the forty-five genes, the expression of which is significantly altered by SrfJ with a fold-change threshold of two, suggests that this effector may be involved in protecting Salmonella from host immune defenses.
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Chura, Robyn L., Darcy D. Marciniuk, Ron Clemens, and Scotty J. Butcher. "Test-Retest Reliability and Physiological Responses Associated with the Steep Ramp Anaerobic Test in Patients with COPD." Pulmonary Medicine 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/653831.
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The Steep Ramp Anaerobic Test (SRAT) was developed as a clinical test of anaerobic leg muscle function for use in determining anaerobic power and in prescribing high-intensity interval exercise in patients with chronic heart failure and Chronic Obstructive Pulmonary Disease (COPD); however, neither the test-retest reliability nor the physiological qualities of this test have been reported. We therefore, assessed test-retest reliability of the SRAT and the physiological characteristics associated with the test in patients with COPD. 11 COPD patients (mean FEV143% predicted) performed a cardiopulmonary exercise test (CPET) on Day 1, and an SRAT and a 30-second Wingate anaerobic test (WAT) on each of Days 2 and 3. The SRAT showed a high degree of test-retest reliability (ICC=0.99;CV=3.8%, and bias 4.5 W, error −15.3–24.4 W). Power output on the SRAT was 157 W compared to 66 W on the CPET and 231 W on the WAT. Despite the differences in workload, patients exhibited similar metabolic and ventilatory responses between the three tests. Measures of ventilatory constraint correlated more strongly with the CPET than the WAT; however, physiological variables correlated more strongly with the WAT. The SRAT is a highly reliable test that better reflects physiological performance on a WAT power test despite a similar level of ventilatory constraint compared to CPET.
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Davis, Jessica, Lindsey Zinck, Sheila Kelly, Hareena Sangha, Lawrence N. Shulman, Erin Aakhus, Neel Vallurupalli, et al. "Screened social risk factors & screening acceptability among oncology patients in Philadelphia." Journal of Clinical Oncology 39, no. 15_suppl (May 20, 2021): 12125. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.12125.
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12125 Background: This pilot study describes the cancer-specific social risk factors (SRFs) of oncology patients on active treatment and the acceptability of using SRF screening to inform care and bolster support during cancer treatment. Methods: This is an ongoing cross-sectional survey of adult cancer patients on active treatment at two outpatient cancer centers in the University of Pennsylvania Health System. Since October 2019, 176 patients have completed our two-part, 19-item social risk screening tool (44% response rate; 49% age > 65yo; 45% female; 35% non-white). Survey questions were adapted from other social screening measures (e.g., AHC-HRSN tool, PRAPARE), then pre-tested and modified for our cancer-specific population. Part 1 of our tool covers 12 SRFs in four core domains: technology (e.g., internet accessibility challenges), environmental (e.g., housing instability), emotional (e.g., social isolation), and financial (e.g., ongoing financial toxicity). In part 2, seven acceptability questions cover patients’ perceived appropriateness of and comfort with screening, expectations of clinical staff to act on identified SRFs, prior SRF assistance received, interest in receiving SRF assistance (i.e., a proxy for patients’ most pressing unmet social needs), willingness to add SRF data to electronic health records (EHR), and comfort sharing findings with other clinicians (e.g., oncologists, primary care physicians, nurses). Results: We identified an average of 2.48 SRFs per patient. The five most commonly reported SRFs were ongoing financial toxicity (57%), internet accessibility challenges (46%), social isolation (40%), housing instability (34%), and insufficient internet for telemedicine (29%). The majority of patients thought that SRF screening was appropriate (56%) and many felt comfortable being screened (63%). Half of patients expected cancer center staff to connect them to social resources (50%), fewer wanted staff to just be aware of their SRFs (43%), and a minority did not want staff to know about their SRFs (7%). Many patients had received prior SRF assistance (49%) or were interested in receiving future help (51%). Most patients felt discomfort toward listing SRF results in their EHR (63%) and some felt uncomfortable giving other clinicians access to this data (38%). Conclusions: Our study shows that oncology patients contend with SRFs while undergoing treatment and find SRF screening acceptable. These findings support clinical implementation of a cancer-specific social screening tool into routine cancer care, but also bring attention to privacy preferences and limited acceptability of EHR documentation of SRFs. Cancer centers adopting this approach may gain insights into where interventions or resources could be targeted to meaningfully address SRFs, potentially improving clinical outcomes for vulnerable populations.
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Verschuren, Olaf, Maremka Zwinkels, Marjolijn Ketelaar, Femke Reijnders-van Son, and Tim Takken. "Reproducibility and Validity of the 10-Meter Shuttle Ride Test in Wheelchair-Using Children and Adolescents With Cerebral Palsy." Physical Therapy 93, no. 7 (July 1, 2013): 967–74. http://dx.doi.org/10.2522/ptj.20120513.
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BackgroundFor children with cerebral palsy (CP) who are able to walk or run, the 10-m shuttle run test is currently the test of choice to assess cardiorespiratory fitness. This test, however, has not yet been examined in wheelchair-using youth with CP.ObjectiveThe purpose of this study was to investigate the test-retest reproducibility and validity of the 10-m shuttle ride test (SRiT) in youth with CP.DesignRepeated measurements of the SRiT were obtained.MethodsTwenty-three individuals with spastic CP (18 boys, 5 girls; mean age=13.3 years, SD=3.6 years) using a manual wheelchair for at least part of the day participated in this study. During the study, all participants performed one graded arm exercise test (GAET) and 2 identical SRiTs within 2 weeks. Peak oxygen uptake (V̇o2peak), peak heart rate (HRpeak), and respiratory exchange ratio (RER) were recorded. Intraclass correlation coefficients (2,1), the smallest detectable difference, and the limits of agreement (LOA) were calculated. The association between the results of the SRiT and GAET was tested using Pearson correlation coefficients.ResultsIntraclass correlation coefficients (.99, 95% confidence interval=.98–1.00) for all variables indicated highly acceptable reproducibility. The LOA analysis revealed satisfactory levels of agreement. The SRiT variables demonstrated strong, significant positive correlations for V̇o2peak values obtained during the SRiT and the GAET (r=.84, P<.01).LimitationsAlthough the GAET is considered the gold standard, the cardiorespiratory demand during the GAET was significantly lower compared with during the SRiT. Future studies should determine whether the GAET can still be accepted as the gold standard for upper-extremity exercise.ConclusionsThe SRiT is a reproducible and valid test for measuring cardiorespiratory fitness in youth with spastic CP who self-propel a manual wheelchair.
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Hamidi, Z. S., N. H. Zainol, N. N. M. Shariff, and N. Mohamad Ansor. "Solar Radio Burst Type II Characteristics and Coronal Mass Ejections (CMEs) Structure Based on the Presence of a Moreton Wave." Sains Malaysiana 51, no. 4 (April 30, 2022): 1261–69. http://dx.doi.org/10.17576/jsm-2022-5104-24.
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The Moreton wave has been extensively studied in explaining the relation between solar flare, Coronal Mass Ejections (CMEs) and Solar Radio Solar Burst Type II (SRBT II) phenomena. The purpose of this study was to determine whether Moreton waves have an impact on CME structure based on SRBT II parameters. The drift rate and structures of 28 SRBT II events selected from year 2014 to 2017 and observed by using ground-based Compound Low-cost Low Frequency Transportable Observatory (CALLISTO) spectrometer were determined. The CME data such as width angle and velocity were obtained from Large Angle Spectroscopy Coronagraph Observatory (LASCO) instrument, while solar flare class and its Active Region (AR) were attained from the Geostationary Operational Environmental Satellite (GOES). From the results, impulsive CME events have X, M and C class of solar flare in the presence of Moreton wave by using GONG data archive while gradual CME were associated with C or B class of solar flare. Impulsive CMEs have an angle of width more than 60° and velocity more than 500 km/s associated with both herringbone (HB) and harmonic structure of SRBT II. However, 30% of gradual CMEs which are associated with HB structure of SRBT II did not accompany by Moreton wave presence. Therefore, we can deduce that the impulsive CMEs are formed under the influence of Moreton wave and gradual CMEs emerged without the Moreton wave, based on the structure of SRBT II.
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Tang, Kai, Hongchun Zhu, and Ping Ni. "Spatial Downscaling of Land Surface Temperature over Heterogeneous Regions Using Random Forest Regression Considering Spatial Features." Remote Sensing 13, no. 18 (September 12, 2021): 3645. http://dx.doi.org/10.3390/rs13183645.
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Land surface temperature (LST) is one of the crucial parameters in the physical processes of the Earth. Acquiring LST images with high spatial and temporal resolutions is currently difficult because of the technical restriction of satellite thermal infrared sensors. Downscaling LST from coarse to fine spatial resolution is an effective means to alleviate this problem. A spatial random forest downscaling LST method (SRFD) was proposed in this study. Abundant predictor variables—including land surface reflection data, remote sensing spectral indexes, terrain factors, and land cover type data—were considered and applied for feature selection in SRFD. Moreover, the shortcoming of only focusing on information from point-to-point in previous statistics-based downscaling methods was supplemented by adding the spatial feature of LST. SRFD was applied to three different heterogeneous regions and compared with the results from three classical or excellent methods, including thermal image sharpening algorithm, multifactor geographically weighted regression, and random forest downscaling method. Results show that SRFD outperforms other methods in vision and statistics due to the benefits from the supplement of the LST spatial feature. Specifically, compared with RFD, the second-best method, the downscaling results of SRFD are 10% to 24% lower in root-mean-square error, 5% to 20% higher in the coefficient of determination, 11% to 25% lower in mean absolute error, and 4% to 17% higher in structural similarity index measure. Hence, we conclude that SRFD will be a promising LST downscaling method.
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Majeed, Zahid, Nur Kamila Ramli, Nurlidia Mansor, and Zakaria Man. "Lignin Modified Urea Fertilizer's Biodegradation and Nitrogen Release under Reduced Soil Condition." Applied Mechanics and Materials 699 (November 2014): 981–87. http://dx.doi.org/10.4028/www.scientific.net/amm.699.981.
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Lignin is a natural biopolymer easily available in industrial waste and currently being used in slow release matrix improvements. Research work objective is to study the effect of 5% to 20% alkaline kraft lignin (AL) loadings on the biodegradation and nitrogen release in urea modified tapioca starch, acting as biodegradable slow release fertilizer (SRF) under reduced soil condition. Weight loss (%) of SRFs reduced from 76% to 35% with increasing %AL until day 28. Biodegradability (%) of SRFs affectively reduced at low 5-10%AL compared to high 15-20%AL. Nitrogen release was reduced with increasing the %AL in SRFs. Nitrogen release mechanism showed fickian diffusion mechanism (n<0.5) except for 10%AL (0.5<n<1). The lowest diffusion coefficient, 1.71 x 10-8cm2/s was observed in 10%AL. Fourier transformed infrared analysis of the biodegraded SRFs showed anhydroglucose ring asymmetric stretching vibration due to COC and COH (904-1140cm-1), lignin's aromatic ring stretching (1451-1500cm-1) and deformation of C-H in lignin's guaicyl ring or starch glucose ring (1162 cm-1). Lignin can effectively be used to improve nitrogen slow release and reduce biodegradability of SRFs under reduced soil.
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Бубнов, М. К., С. А. Букарев, С. В. Гущин, В. А. Конюшкин, С. В. Кузнецов, А. А. Ляпин, A. H. Накладов, П. А. Рябочкина, В. В. Воронов, and П. П. Федоров. "Ап-конверсионная люминесценция твердых растворов CaF-=SUB=-2-=/SUB=--SrF-=SUB=-2-=/SUB=--HoF-=SUB=-3-=/SUB=- при возбуждении на уровень -=SUP=-5-=/SUP=-I-=SUB=-7-=/SUB=- ионов Ho-=SUP=-3+-=/SUP=-." Оптика и спектроскопия 131, no. 3 (2023): 346. http://dx.doi.org/10.21883/os.2023.03.55384.4085-22.
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Up-conversion luminescence spectra of CaF2-SrF2-HoF3 single crystals were investigated upon excitation by laser radiation with a wavelength of 1940 nm to the 5I7 level of Ho3+ ions. The CaF2-SrF2-HoF3 single crystals were grown by the vertical directional crystallization method. For these excitation conditions, quantitative characteristics of the up-conversion luminescence of Ho3+ ions were determined: energy yield, chromaticity coordinates, and correlated color temperatures. The possibility of increasing the efficiency of solar cells due to the conversion of infrared radiation in CaF2-SrF2-HoF3 crystals was considered.