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Автор: Grafiati

Опубліковано: 11 вересня 2023

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Ring, Jack. "IMPROVING SYSTEM ENGINEERING EFFECTIVENESS >>> THE POSSIBILITIES >>>." INCOSE International Symposium 4, no. 1 (August 1994): 696–701. http://dx.doi.org/10.1002/j.2334-5837.1994.tb01778.x.

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Bazarova, J. G., A. V. Logvinova, and B. G. Bazarov. "Interactions in ternary bismuth-containing molybdate systems M2MoO4-Bi2(MoO4)3-Zr(MoO4)2 in the subsolidus region." Proceedings of Universities. Applied Chemistry and Biotechnology 11, no. 4 (January 6, 2022): 508–16. http://dx.doi.org/10.21285/2227-2925-2021-11-4-508-516.

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Анотація:

A fundamental problem in materials science consists in establishing a relationship between the chemical composition, structure, and properties of materials. This issue can be solved through the study of multicomponent systems and the directed synthesis of promising compounds. Of practical interest here are active dielectrics that are based on complex oxide compounds, specifically molybdates. Among complex molybdates and tungstates, ternary caged molybdates of the following structural types are of greatest importance: nasicon, perovskite, langbeinite, etc. Due to their widely varying elemental and quantitative compositions, such molybdates are convenient models for structural and chemical design, as well as the establishment of “composition–structure– properties” genetic relationships. Bismuth-containing complex molybdate systems exhibit the formation of phases having ferro-piezoelectric, ionic, and other properties. In this work, the Rb2MoO4–Bi2(MoO4)3–Zr(MoO4)2 ter nary salt system was studied for the first time using the method of intersecting sections in the subsolidus region (450–650 ℃). To this end, quasibinary sections were identified; triangulation was performed. Ternary molybdates Rb5BiZr(MoO4)6 and Rb2BiZr2(MoO4)6,5 were formed in the system using a ceramic technology. These compounds are isostructural to the previously obtained REE molybdates (M5LnZr(MoO4)6) but contain trivalent bismuth instead of rare earth elements. The structure of Rb5BiZr(MoO4)6 was adjusted via the Rietveld refinement technique using the TOPAS 4.2 software package. The ternary molybdate crystallizes in a trigonal system, with the following unit cell parameters of the R`3c space group: a = 10.7756(2) and c = 39.0464(7) Å. According to the studies of thermal properties exhibited by M5BiZr(MoO4)6, these ternary molybdates undergo the first-order phase transition in the temperature range of 450–600 ºC. The IR and Raman spectra of M5BiZr(MoO4)6 reveal the crystallization of ternary molybdates in the R`3c space group. The conducted comparative characterization of M2MoO4–Bi2(MoO4)3–Zr(MoO4)2 phase diagrams suggests that the phase equilibria of these systems depend on the nature of molybdates of monovalent elements.

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Kürten, A., S. Münch, L. Rondo, F. Bianchi, J. Duplissy, T. Jokinen, H. Junninen, et al. "Thermodynamics of the formation of sulfuric acid dimers in the binary (H2SO4-H2O) and ternary (H2SO4-H2O-NH3) system." Atmospheric Chemistry and Physics Discussions 15, no. 10 (May 18, 2015): 13957–4006. http://dx.doi.org/10.5194/acpd-15-13957-2015.

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Abstract. Sulfuric acid is an important gas influencing atmospheric new particle formation (NPF). Both the binary (H2SO4-H2O) system, and the ternary system involving ammonia (H2SO4-H2O-NH3) may be important in the free troposphere. An essential step in the nucleation of aerosol particles from gas-phase precursors is the formation of a dimer, so an understanding of the thermodynamics of dimer formation over a wide range of atmospheric conditions is essential to describe NPF. We have used the CLOUD chamber to conduct nucleation experiments for these systems at temperatures from 208 to 248 K. Neutral monomer and dimer concentrations of sulfuric acid were measured using a Chemical Ionization Mass Spectrometer (CIMS). From these measurements dimer evaporation rates in the binary system were derived for temperatures of 208 and 223 K. We compare these results to literature data from a previous study that was conducted at higher temperatures but is in good agreement with the present study. For the ternary system the formation of H2SO4 • NH3 is very likely an essential step in the formation of sulfuric acid dimers, which were measured at 210, 223, and 248 K. We estimate the thermodynamic properties (dH and dS) of the H2SO4 • NH3 cluster using a simple heuristic model and the measured data. Furthermore, we report the first measurements of large neutral sulfuric acid clusters containing as many as 10 sulfuric acid molecules for the binary system using Chemical Ionization-Atmospheric Pressure interface-Time Of Flight (CI-APi-TOF) mass spectrometry.

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Kürten, A., S. Münch, L. Rondo, F. Bianchi, J. Duplissy, T. Jokinen, H. Junninen, et al. "Thermodynamics of the formation of sulfuric acid dimers in the binary (H2SO4–H2O) and ternary (H2SO4–H2O–NH3) system." Atmospheric Chemistry and Physics 15, no. 18 (September 25, 2015): 10701–21. http://dx.doi.org/10.5194/acp-15-10701-2015.

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Анотація:

Abstract. Sulfuric acid is an important gas influencing atmospheric new particle formation (NPF). Both the binary (H2SO4–H2O) system and the ternary system involving ammonia (H2SO4–H2O–NH3) may be important in the free troposphere. An essential step in the nucleation of aerosol particles from gas-phase precursors is the formation of a dimer, so an understanding of the thermodynamics of dimer formation over a wide range of atmospheric conditions is essential to describe NPF. We have used the CLOUD chamber to conduct nucleation experiments for these systems at temperatures from 208 to 248 K. Neutral monomer and dimer concentrations of sulfuric acid were measured using a chemical ionization mass spectrometer (CIMS). From these measurements, dimer evaporation rates in the binary system were derived for temperatures of 208 and 223 K. We compare these results to literature data from a previous study that was conducted at higher temperatures but is in good agreement with the present study. For the ternary system the formation of H2SO4·NH3 is very likely an essential step in the formation of sulfuric acid dimers, which were measured at 210, 223, and 248 K. We estimate the thermodynamic properties (dH and dS) of the H2SO4·NH3 cluster using a simple heuristic model and the measured data. Furthermore, we report the first measurements of large neutral sulfuric acid clusters containing as many as 10 sulfuric acid molecules for the binary system using chemical ionization–atmospheric pressure interface time-of-flight (CI-APi-TOF) mass spectrometry.

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Kornienko, Oksana, Sergiy Yushkevych, Oleksandr Bykov, Anatoliy Samelyuk та Yurii Bataiev. "Phase Equilibrium in the Ternary CeО2-La2O3-Yb2O3 System at 1500 °С". Solid State Phenomena 331 (29 квітня 2022): 159–72. http://dx.doi.org/10.4028/p-4000g3.

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Materials based on cerium oxides and REE are perspective for use in medicine, energy and mechanical engineering due to the uniqueness of their authorities. Stationary system diagrams are the physicochemical basis for the creation of such materials as solid electrolytes for fuel comics, oxygen gas sensors, catalyst carriers, protected coatings for alloys, etc. In this work, phase equilibria and structural transformations in the system CeO2-La2O3-Yb2O3 at a temperature of 1500 oС in all international concentrations are investigated by the methods of microstistructural and X - ray phase analysis. It is established that in the triple system CeO2-La2O3-Yb2O3 fields of solid solutions based on cubic (F) modification of the structure of the structure of fluorite CeO2, monoclinic (B) and cubic (C) modification of Yb2O3 and hexagonal (A) modification of La2O3 (R) are used, which crystallizes in a Perovski-type structure with rhombic curvatures. It was found that the rarefaction of CeO2 in the crystal lattice of the ordered phase with the structure of the perovskite type LaYbO3 (R) is ~ 3 mol. %. Isothermal review of the state diagram of the systems CeO2-La2O3-Yb2O3 at reveals the presence of two three-phase (F + C + R), (A + R + F) and five two-phase (A + F), (A + R), (R + C), (F + R), (F + C) regions.

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Salina, V. A., and Vladimir Zhuchkov. "Study of Manganese Recovery in the CaO-SiO2-MgO-Al2O3-MnO-Fe2O3 System by Thermodynamic Simulation." Materials Science Forum 1052 (February 3, 2022): 233–37. http://dx.doi.org/10.4028/p-wcsi54.

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The results of thermodynamic simulation of the manganese recovery in the CaO-SiO2-MgO-Al2O3-MnO-Fe2O3 system by carbon are presented. Parameters of the initial system are temperature range 1400-at a step of , a total pressure of 0.1 MPa, and N2. The composition of the oxide system is corresponded by the manganese ore (wt %) 1.1 MnO2, 44.3 MnO, 28.4 CaO, 9.3 SiO2, 5.4 MgO, 0.3 Al2O3, 11.2 Fe2O3 and silicomanganese slag. It contains (wt %) 16.3 MnO, 18.4 CaO, 52 SiO2, 7.8 MgO, 5.26 Al2O3, and 0.24 FeO. The amount of silicomanganese slag in the system was 0, 5, 12, and 25%. Carbon is used as a reducing agent. Its consumption is increased by 5% from the stoichiometry for the recovery of Fe and Mn and by 8% of the metal mass for the formation of iron, manganese, and silicon carbides. The simulation is carried out using HSC Chemistry 6.12 () software package. The thermodynamic characteristics of the Fe3C, Fe2O3, FeO, MnO2, Mn, Mn3C, Mn5C2, Mn7C3, Mn23C6, and SiC compounds existing in the database are refined. It was determined that an increase in the melt temperature from 1400 to increases the degree of manganese recovery (ηMn) for all compositions of the systems. An increase of the silicomanganese slag content in the mixture from 0 to 25% decreases ηMn from 89.3 to 85% at and from 95.8 to 91.5% at . The chemical composition of the high-carbon ferromanganese alloy is (wt %): 71.9-72.8 Mn, 16.6-17.9 Fe, 0.015-1.64 Si, and 9-. The simulation results can be used to develop a technology for producing a high-carbon ferromanganese when silicomanganese slag is involved in metallurgical processing.

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Zhang, Zhi Hao, Yu Si Wang, Jing Zeng, and Han Bing He. "Molecular Dynamics Simulation of the Effect of Zr and b on Cryolite Molten Salt System 78%Na3AlF6-9.5%AlF3-5.0%CaF2-7.5%Al2O3." Materials Science Forum 1079 (December 26, 2022): 135–44. http://dx.doi.org/10.4028/p-j89jnx.

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The analysis of high temperature physical and chemical properties of molten salt system of aluminum electrolysis has guiding significance for practical production In this paper, the molecular dynamics calculation method was used to simulate the physical and chemical properties of 78%Na3AlF6-9.5%AlF3-5.0%CaF2-7.5%Al2O3 molten salt electrolyte system with Zr and B as additives at 1200K and standard atmospheric pressure. The effects of Zr and B elements on the radial distribution function, coordination number, diffusion coefficient, viscosity, and conductivity of electrolyte system were discussed in detail. The simulation results showed that Zr4+ weakened the connection between Al3+, while the addition of B3+ enhanced the interaction between Al3+, Na+, and F-. In the electrolyte system without impurities, the order of self-diffusion coefficient is Na+ > O2- > F- > Ca2+ > Al3+. And the addition of Zr4+ is conducive to the diffusion of ions in the system, while the addition of B3+ is not conducive to the diffusion of ions in the system. What’s more, the addition of Zr improves the conductivity of the system, while the addition of B reduces the conductivity of the system.

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Stening, R. J. "The shape of the Sq current system." Annales Geophysicae 26, no. 7 (June 26, 2008): 1767–75. http://dx.doi.org/10.5194/angeo-26-1767-2008.

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Abstract. Many years ago Mayaud (1965) suggested that a tilted, rather than symmetric, current system may be responsible for the form of daily magnetic variations near the focus of the current system. With arrays of magnetometer stations, both in Australia and in Europe, it is now demonstrated that such tilted systems do exist at certain times. At other times the magnetic variation near the focus is deformed by a previously reported extra morning current system which is apparently unconnected to the regular Sq system.

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MAGOMEDOV, K. G., and R. K. KAMILOV. "EFFICIENCY OF PASTURE SYSTEM USE ." AIC development problems of the region, no. 3 (2021): 54–58. http://dx.doi.org/10.52671/20790996_2021_3_54.

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Braun, Jean. "Comparing the transport-limited and ξ–q models for sediment transport". Earth Surface Dynamics 10, № 2 (4 квітня 2022): 301–27. http://dx.doi.org/10.5194/esurf-10-301-2022.

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Abstract. Here I present a comparison between two of the most widely used reduced-complexity models for the representation of sediment transport and deposition processes, namely the transport-limited (or TL) model and the under-capacity (or ξ–q) model more recently developed by Davy and Lague (2009). Using both models, I investigate the behavior of a sedimentary continental system of length L fed by a fixed sedimentary flux from a catchment of size A0 in a nearby active orogen through which sediments transit to a fixed base level representing a large river, a lake or an ocean. This comparison shows that the two models share the same steady-state solution, for which I derive a simple 1D analytical expression that reproduces the major features of such sedimentary systems: a steep fan that connects to a shallower alluvial plain. The resulting fan geometry obeys basic observational constraints on fan size and slope with respect to the upstream drainage area, A0. The solution is strongly dependent on the size of the system, L, in comparison to a distance L0, which is determined by the size of A0, and gives rise to two fundamentally different types of sedimentary systems: a constrained system where L<L0 and open systems where L>L0. I derive simple expressions that show the dependence of the system response time on the system characteristics, such as its length, the size of the upstream catchment area, the amplitude of the incoming sedimentary flux and the respective rate parameters (diffusivity or erodibility) for each of the two models. I show that the ξ–q model predicts longer response times. I demonstrate that although the manner in which signals propagates through the sedimentary system differs greatly between the two models, they both predict that perturbations that last longer than the response time of the system can be recorded in the stratigraphy of the sedimentary system and in particular of the fan. Interestingly, the ξ–q model predicts that all perturbations in the incoming sedimentary flux will be transmitted through the system, whereas the TL model predicts that rapid perturbations cannot. I finally discuss why and under which conditions these differences are important and propose observational ways to determine which of the two models is most appropriate to represent natural systems.

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Sakamoto, Yuki, and Hideki Yamamoto. "Measurement of Thermophysical Property of Energy Storage System (CaCl2&#46NH3 System)." Natural Resources 05, no. 12 (2014): 687–97. http://dx.doi.org/10.4236/nr.2014.512060.

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Pido, Alvanh Alem G., Art Anthony Z. Munio, and Leo Cristobal C. Ambolode II. "Ab Initio Calculations of the Atomic Structure, Stability, and Electronic Properties of (C6H10O5)2 Encapsulation into Hydrogen-Doped Carbon Nanotube." Nano Hybrids and Composites 38 (February 3, 2023): 53–62. http://dx.doi.org/10.4028/p-3uk80a.

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This research investigated the Hydrogen doping of the single-walled carbon nanotube (HCNT) with encapsulated cellulose, (C6H10O5)2, and provide theoretical predictions on the properties of the resulting complex system. After full structural optimization, two different bond lengths and angles in the HCNT and (C6H10O5)2/HCNT system were calculated. Further, it was found that substitutional H atoms acted as charge acceptors and drove necessary rearrangements in the valence region. The (C6H10O5)2 caused some peaks at the valence band mainly caused by the p orbitals of the oxygen atoms. A bandgap decrease has been observed for the (C6H10O5)2/HCNT system. The results are consistent with the previous works which demonstrated the possibility of band gap engineering in CNTs.

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Toonssen, Richard, Stefano Sollai, P. V. Aravind, Nico Woudstra, and Adrian H. M. Verkooijen. "Alternative system designs of biomass gasification SOFC/GT hybrid systems." International Journal of Hydrogen Energy 36, no. 16 (August 2011): 10414–25. http://dx.doi.org/10.1016/j.ijhydene.2010.06.069.

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Querol, X., T. Moreno, A. Karanasiou, C. Reche, A. Alastuey, M. Viana, O. Font, J. Gil, E. de Miguel, and M. Capdevila. "Variability of levels and composition of PM10 and PM2.5 in the Barcelona metro system." Atmospheric Chemistry and Physics Discussions 12, no. 3 (March 2, 2012): 6655–713. http://dx.doi.org/10.5194/acpd-12-6655-2012.

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Abstract. From an environmental perspective, the underground metro system is one of the cleanest forms of public transportation in urban agglomerations. Current studies report contradicting results regarding air quality in the metro systems: whereas some reveal poor air quality, others report PM levels which are lower or of the same order of magnitude than those measured in traffic sites above ground level. The present work assesses summer indoor air quality and passenger exposure in the Barcelona metro, focusing on PM levels and their metal contents. In addition, the impact on indoor air quality of platform screen door systems (automated systems consisting of closed rail track and platforms) is evaluated, to determine whether these systems reduce passenger exposure to PM when compared with conventional systems (open tracks and platforms). In the Barcelona metro, PM levels inside the trains in summer are amongst the lowest reported for worldwide metro systems (11–32 μPM2.5 m−3). This is most probably due to the air conditioning system working in all carriages of the Barcelona metro during the whole year. On the platforms, levels were considerably higher, reaching mean levels of 59 and 88 μgPM2.5 m−3 in the new (L9) and old (L3) lines, respectively. PM10 data are also reported in the present study, but comparison with other metro systems is more difficult due to the scarcity of data compared with PM2.5. Results showed clear PM daily cycles, with a drastic increase from 06:00 to 07:00 a.m., a diurnal maximum from 07:00 a.m. to 10:00 p.m., and marked decreases between 10:00 p.m. and 05:00 a.m. The elements with the highest enrichment are those associated with wheel or brake abrasion products (Ba, Fe, Cu, Mn, Cr, Sb, As, Mo, Co, Sr, among others). Laminar hematite (Fe2O3) was the dominant particle type, being mainly originated by mechanical abrasion of the rail track and wheels. Regarding passenger exposure to PM inside the metro system, the contribution of commuting by metro was estimated to account for around 10% of the daily exposure. Finally, we conclude that the implementation of platform screen door systems results in reductions of both PM levels and metal concentrations, but in addition an advanced optimized ventilation system gave even a much higher efficiency in reducing PM exposure to metro commuters. Combining these two features PM exposure levels in the platforms may be reduced down by a factor of 7 with respect the old subway lines in Barcelona.

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MĄKOSA, Grzegorz. "NATIONAL TELEINFORMATION SYSTEMS SECURITY MANAGEMENT." National Security Studies 17, no. 1 (May 15, 2020): 129–46. http://dx.doi.org/10.37055/sbn/144283.

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Celem artykułu jest przegląd i ocena krajowych systemów teleinformatycznych z perspektywy zagrożeń i ataków cybernetycznych oraz działalności krajowych jednostek cyberbezpieczeństwa realizujących zadania dla podmiotów gospodarki i administracji publicznej i rządowej – CERT Polska i CSIRT GOV, zaprezentowanej z perspektywy zestawienia i analizy danych z ich corocznych raportów, dotyczących stanu cyberbezpieczeństwa kraju. Raporty pokazują jednoznacznie, że niezależnie od charakteru ujawnionych incydentów środowisko krajowych systemów teleinformatycznych jest w trybie ciągłym poddawane różnorodnym szkodliwym i przestępczym działaniom oraz atakom i wymaga zapewnienia stałej ochrony. Zagadnienie zapewnienia bezpieczeństwa systemów teleinformatycznych podejmują regulacje dotyczące zarządzania kryzysowego, krajowego systemu cyberbezpieczeństwa i informatyzacji podmiotów publicznych. Ww. regulacje prawne definiują m.in. wymagania wobec podmiotów nimi objętych odnośnie wdrożenia odpowiednich rozwiązań organizacyjnych i technicznych bezpieczeństwa oraz systemu zarządzania bezpieczeństwem systemów teleinformatycznych i informacji w celu zapewnienia właściwego poziomu ich bezpieczeństwa. Autor przedstawia proponowane przez siebie podejście do zastosowania spójnego i kompletnego zbioru norm ISO adresujących kwestie zarządzania bezpieczeństwem informacji, wdrażanego jako zintegrowany system zarządzania bezpieczeństwem.

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Pavlyukevich, Yu G., L. F. Papko, M. M. Hundzilovich, P. S. Larionov та A. A. Uvarov. "Phase separation and properties of glasses of the system MgO–CaO–Fe 2O3–Al2O3–В2O3–SiO2". Proceedings of the National Academy of Sciences of Belarus, Chemical Series 58, № 3 (7 вересня 2022): 317–24. http://dx.doi.org/10.29235/1561-8331-2022-58-3-317-324.
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The synthesis and study of model glasses of the MgO–CaO–Fe2O3–Al2O3–SiO2 system, which is the base for obtaining continuous basalt fiber, has been carried out. Systematized data on the effect of components on the glasses structure and the sequence of phase separation processes occurring during their heat treatment have been obtained. It is shown that during phase separation, crystalline phases are separated in the following sequence: magnetite–pyroxene–plagioclase with a predominance of the anorthite component. Glasses of the MgO–CaO–Fe2O3–Al2O3–SiO2 system were modified by adding B2O3, and the active role of this component in the processes of glass formation and crystallization was shown. The ratio of glass-forming and modifying components of model glasses is established, at which an increase in the strength of glasses from 110 to 180 MPa is achieved. Based on the study of the technological properties of model glasses and strength characteristics, components were determined for modifying basalt glasses in order to increase the strength of the fiber.

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van der Laan, S., R. E. M. Neubert, and H. A. J. Meijer. "A single gas chromatograph for accurate atmospheric mixing ratio measurements of CO2, CH4, N2O, SF6 and CO." Atmospheric Measurement Techniques Discussions 2, no. 3 (May 18, 2009): 1321–49. http://dx.doi.org/10.5194/amtd-2-1321-2009.
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Анотація:
Abstract. We present an adapted gas chromatograph capable of measuring simultaneously and semi-continuously the atmospheric mixing ratios of the greenhouse gases CO2, CH4, N2O and SF6 and the trace gas CO with high precision and long-term stability. The novelty of our design is that all species are measured with only one device, making it a very cost-efficient system. No time lags are introduced between the measured mixing ratios. The system is designed to operate fully autonomously which makes it ideal for measurements at remote and unmanned stations. Only a small amount of sample air is needed, which makes this system also highly suitable for flask air measurements. In principle, only two reference cylinders are needed for daily operation and only one calibration per year against international WMO standards is sufficient to obtain high measurement precision and accuracy. The system described in this paper is in use since May 2006 at our atmospheric measurement site Lutjewad near Groningen, The Netherlands at 6°21' E, 53°24' N, 1 m a.s.l. Results show the long-term stability of the system. Observed measurement precisions at our remote research station Lutjewad were: ±0.04 ppm for CO2, ±0.8 ppb for CH4, ±0.8 ppb for CO, ±0.3 ppb for N2O, and ±0.1 ppt for SF6. The ambient mixing ratios of all measured species as observed at station Lutjewad for the period of May 2007 to August 2008 are presented as well.

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van der Laan, S., R. E. M. Neubert, and H. A. J. Meijer. "A single gas chromatograph for accurate atmospheric mixing ratio measurements of CO2, CH4, N2O, SF6 and CO." Atmospheric Measurement Techniques 2, no. 2 (September 23, 2009): 549–59. http://dx.doi.org/10.5194/amt-2-549-2009.
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Анотація:
Abstract. We present an adapted gas chromatograph capable of measuring simultaneously and semi-continuously the atmospheric mixing ratios of the greenhouse gases CO2, CH4, N2O and SF6 and the trace gas CO with high precision and long-term stability. The novelty of our design is that all species are measured with only one device, making it a very cost-efficient system. No time lags are introduced between the measured mixing ratios. The system is designed to operate fully autonomously which makes it ideal for measurements at remote and unmanned stations. Only a small amount of sample air is needed, which makes this system also highly suitable for flask air measurements. In principle, only two reference cylinders are needed for daily operation and only one calibration per year against international WMO standards is sufficient to obtain high measurement precision and accuracy. The system described in this paper is in use since May 2006 at our atmospheric measurement site Lutjewad near Groningen, The Netherlands at 6°21´ E, 53°24´N, 1 m a.s.l. Results show the long-term stability of the system. Observed measurement precisions at our remote research station Lutjewad were: ±0.04 ppm for CO2, ±0.8 ppb for CH4, ±0.8 ppb for CO, ±0.3 ppb for N2O, and ±0.1 ppt for SF6. The ambient mixing ratios of all measured species as observed at station Lutjewad for the period of May 2007 to August 2008 are presented as well.

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Nesterova, Irina V., Galina A. Chudilova, Margarita G. Atazhakhova, Valeriya A. Matushkina, Svetlana V. Kovaleva та Valeriya N. Chapurina. "Quantitative and phenotypic transformation of CD16+IFNα/βR1-CD119+, CD16+IFNα/βR1+CD119- and CD16+IFNα/βR1+CD119+ neutrophil granulocytes subsets in patients with post-COVID syndrome". Russian Journal of Immunology 26, № 3 (11 серпня 2023): 363–72. http://dx.doi.org/10.46235/1028-7221-9994-qap.
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Анотація:
In patients who underwent COVID-19, various manifestations of post-COVID syndrome (PCS) are noted, causing the development of disorders accompanying severe viral infections, complicated by chronic fatigue syndrome (CFS) and severe cognitive disorders (CD). Studying the molecular mechanisms of these disorders in the system of neutrophilic granulocytes (NG) in patients with PCS associated with IFN production, receptor function of NG, in particular, their subsets expressing IFN/R, IFNR(CD119), is relevant for the search for therapeutic strategies, restoration and enhancement of the innate immune response after COVID-19. Our objective was to clarify the quantitative and phenotypic characteristics of certain subsets of neutrophil granulocytes, i.e., CD16+IFN/R1-CD119+, CD16+IFN/R1+CD119-, CD16+IFN/R1+CD119+, in peripheral blood of patients with post-COVID syndrome. We have examined 39 patients (24-60 years old) with PCS 3 months after COVID-19 (study group 1, SG1). The comparison group (CG) included 30 volunteers examined over the pre-COVID period. Detection of herpesvirus infections (HSV1, EBV, HHV6, CMV) was carried out in scrapings from the tonsils and the posterior wall of the pharynx. To determine the severity of the clinical PCS symptoms, a questionnaire was used to assess its severity using a point scale. The content and phenotype of NG subsets CD16+IFN/R1-CD119+, CD16+IFN/R1+CD119-, CD16+IFN/R1+CD119+ were assessed by means of FC 500 (Beckman Coulter, USA). In all patients of SG1, clinical manifestations of CFS and CD were revealed, at the average severity rates of 16.0 points (14.75-20.25). When detecting herpesvirus infections, 37.2% had only HSV1 infection; 62.8% of patients showed mixed infection (HSV1, EBV, HHV6), which exhibited more pronounced clinical symptoms. We have noted absence of CD16+IFN/R1+CD119+NG subset and phenotype transformation of CD16+IFN/R1-CD119+NG, CD16+IFN/R1+CD119-NG subsets. Increased density expression of CD16, IFN/R1, CD119 receptors was also found (p1-3 0.05) thus suggesting ability to accept the interferon signaling and response. Reduced infectious burden in the post-COVID period and adequate functioning of the immune system, including the neuroimmunoendocrine regulation mechanisms, should contribute to the functional recovery of various organs, systems, thus neutralizing the PCS manifestations. Therefore, usage of recIFN2b in combination with highly active antioxidants may contribute to development of protective immunity, prevention of acute respiratory viral infections, exacerbation of chronic infections, and restoration of the NG phenotypes followed by restoration of anti-infectious immune balance.

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20

Sakharova, Polina S., Victor S. Pyzhov та Elena O. Bakhrushina. "Poly(l-lactide-со-glycolide) and shellac in the development of phase-sensitive in situ implants". Aspirantskiy Vestnik Povolzhiya 22, № 4 (23 грудня 2022): 51–57. http://dx.doi.org/10.55531/2072-2354.2022.22.4.51-57.
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Анотація:
Aim to consider the potential prospects of using Poly(l-lactide-co-glycolide) (PLGA) and shellac to obtain phase-dependent in situ implants. Material and methods. The study required two stages: stage I was the evaluation of NMP-polymer compositions, and stage II was the evaluation of NMP-polymer-PEG compositions. We used PLGA with various ratios of lactide and glycolide units (75:25, 50:50), dewaxed bleached shellac, N-methylpyrrolidone (NMP) as a solvent, and PEG-1500 at a concentration of 5% (wt/vol) as a co-solvent. The experimental formulations contained matrix formers at a concentration of 33%. The formulations were screened for polymer solubility in NMP, homogeneity and permeability through the needle of the resulting polymer-NMP system, the implant formation rate during the liquid-liquid extraction in a phosphate buffer solution (pH=6.8), and the implant morphology. The rate of implant formation and the diffusion of the dye from the delivery systems were also studied using the in vitro agar gingiva model, previously developed in the laboratory of the A.P. Nelyubin Institute of Pharmacy. Results. The first stage of the study showed that the NMP-PLGA system (75:25) formed a solid implant in 1 hour, and the NMP-shellac system in 2 hours. The formulations were positively assessed according to the presented criteria, despite the very different diffusion volumes 1414 l for NMP-shellac and 1065 l for NMP-PLGA (75:25) which indicates the possibility of their use without the introduction of additional excipients. The NMP-PLGA system (50:50) had not completely precipitated after the critical time (3 hours) and was considered as requiring an adjustment due to the insufficient implant formation rate. In the stage II, a less intense diffusion of the dye from the implants into agar was observed. For example, for NMP-PLGA(50:50) 641 l, and for NMP-PLGA(50:50)-PEG 25 l. At the same time, there was the positive dynamics in the time of their precipitation both in phosphate buffer medium (instantaneous precipitation without the need for shaking) and in the in vitro agar gingiva model after 3 hours, the composition of NMP-PLGA (50:50)-PEG, in contrast to NMP-PLGA (50:50), had formed a semi-solid implant. Conclusion. In the course of the experiments, the compositions of NMP-shellac and NMP-PLGA (75:25) were selected as the most promising for further development of a phase-sensitive in situ dental implant. The addition of PEG was found to be rational in terms of increasing the rate of implant precipitation and reducing the initial diffusion of the solvent.

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21

Lachmann, N., S. Brennig, N. Pfaff, H. Schermeier, J. Dahlmann, R. Phaltane, I. Gruh, et al. "Efficient in vivo regulation of cytidine deaminase expression in the haematopoietic system using a doxycycline-inducible lentiviral vector system." Gene Therapy 20, no. 3 (May 17, 2012): 298–307. http://dx.doi.org/10.1038/gt.2012.40.
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22

SUZUKI, TAKERU. "Concepts, Syntax, and Their Interface: The Theta System ." ENGLISH LINGUISTICS 36, no. 1 (2019): 93–102. http://dx.doi.org/10.9793/elsj.36.1_93.
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23

Islam, Md Amirul, Mohammad Ekramol Islam, and Abdur Rashid. "(s, S) stochastic inventory system in Jackson network." International Journal of Operational Research 43, no. 4 (2022): 416. http://dx.doi.org/10.1504/ijor.2022.122813.
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24

Kim, Hyun S., Inyoung Park, Chul H. Song, Kyunghwa Lee, Jae W. Yun, Hong K. Kim, Moongu Jeon, Jiwon Lee, and Kyung M. Han. "Development of a daily PM10 and PM2.5 prediction system using a deep long short-term memory neural network model." Atmospheric Chemistry and Physics 19, no. 20 (October 18, 2019): 12935–51. http://dx.doi.org/10.5194/acp-19-12935-2019.
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Анотація:
Abstract. A deep recurrent neural network system based on a long short-term memory (LSTM) model was developed for daily PM10 and PM2.5 predictions in South Korea. The structural and learnable parameters of the newly developed system were optimized from iterative model training. Independent variables were obtained from ground-based observations over 2.3 years. The performance of the particulate matter (PM) prediction LSTM was then evaluated by comparisons with ground PM observations and with the PM concentrations predicted from two sets of 3-D chemistry-transport model (CTM) simulations (with and without data assimilation for initial conditions). The comparisons showed, in general, better performance with the LSTM than with the 3-D CTM simulations. For example, in terms of IOAs (index of agreements), the PM prediction IOAs were enhanced from 0.36–0.78 with the 3-D CTM simulations to 0.62–0.79 with the LSTM-based model. The deep LSTM-based PM prediction system developed at observation sites is expected to be further integrated with 3-D CTM-based prediction systems in the future. In addition to this, further possible applications of the deep LSTM-based system are discussed, together with some limitations of the current system.

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25

Zübert, Christina, Anna-Marie Ilic, Bojan Duduk, and Michael Kube. "The Genome Reduction Excludes the Ribosomal Rescue System in Acholeplasmataceae." Microbial Physiology 32, no. 1-2 (2022): 45–56. http://dx.doi.org/10.1159/000520450.
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Анотація:
The trans-translation process is a ribosomal rescue system for stalled ribosomes processing truncated mRNA. The genes ssrA and smpB fulfil the key functions in most bacteria, but some species have either lost these genes or the function of the ribosomal rescue system is taken over by other genes. To date, the ribosomal rescue system has not been analysed in detail for the Acholeplasmataceae. This family, in the Mollicutes class, comprises the genus Acholeplasma and the provisional taxon “Candidatus Phytoplasma”. Despite their monophyletic origin, the two clades can be separated by traits such as not representing primary pathogens for acholeplasmas versus being phytopathogenic for the majority of phytoplasmas. Both taxa share reduced genomes, but only phytoplasma genomes are characterised by a remarkable level of instability and reduction. Despite the general relevance of the ribosomal rescue system, information is lacking on coding, the genomic context and pseudogenisation of smpB and ssrA and their possible application as a phylogenetic marker. Herein, we provide a comprehensive analysis of the ribosomal rescue system in members of Acholeplasmataceae. The examined Acholeplasmataceae genomes encode a ribosomal rescue system, which depends on tmRNA encoded by ssrA acting in combination with its binding protein SmpB. Conserved gene synteny is evident for smpB, while ssrA shows a less conserved genomic context. Analysis of the tmRNA sequences highlights the variability of proteolysis tag sequences and short conserved sites at the 5′- and 3′-ends. Analyses of smpB provided no hints regarding the coding of pseudogenes, but they did suggest its application as a phylogenetic marker of Acholeplasmataceae – in accordance with 16S rDNA topology. Sequence variability of smpB provides sufficient information for species assignment and phylogenetic analysis.

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26

Bassett, R. H., J. P. Kimmance, and C. Rasmussen. "An automated electrolevel deformation monitoring system for tunnels." Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 137, no. 3 (July 1999): 117–25. http://dx.doi.org/10.1680/gt.1999.370301.
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27

Raghunath, Nisha, Christopher Pereyda, Justin Frow, Diane Cook, and Maureen Schmitter-Edgecombe. "A Robot Activity Support (RAS) system for persons with memory impairment: Comparing older and younger adults' perceptions of the system." Gerontechnology 19, no. 3 (September 30, 2020): 1–11. http://dx.doi.org/10.4017/gt.2020.19.003.07.
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28

Pivinskii, Yu E., and P. V. Dyakin. "Cementless refractory castable. Part 9. HCBS and ceramic concretes in the Al2O3‒SiO2‒SiC system." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 6 (November 29, 2021): 10–24. http://dx.doi.org/10.17073/1683-4518-2021-6-10-24.
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Анотація:
The priority-chronological aspect of research and technological development in the field of SiC-containing HCBS and ceramic castables in the systems Al2O3‒SiO2‒SiC and Al2O3‒SiO2‒SiC‒C is characterized. The results of studies on the effect of the firing temperature and prolonged (up to 100 h) high-temperature heat treatment on the oxidation kinetics of SiC of different dispersion and content are considered. A noticeable oxidation, accompanied by an increase in the mass and growth of samples, is noted after 1200 °C and significant at 1300‒1400 °C. The effect of the firing temperature in the range of 1000‒1400 °C and long holding in a tunnel furnace (60 h at 1300‒1400 °C) on the dynamics of phase transformations and the structure of samples of the matrix system based on HCBS of composite composition (bauxite + 11 % VFQG), as well as with an additional content of 15% SiC. In contrast to firing in air, during the service of monolithic gutter masses in the Al2O3‒SiO2‒SiC‒C system, the working surface of concrete is largely isolated from the air due to cast iron and slag. This drastically reduces the rate of both SiC oxidation and carbon burnout. The zonal structure of the lining is characterized. The data on the effect of heating and cooling on the modulus of elasticity of ceramic castable are presented.

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29

Fountoukis, C., and A. Nenes. "ISORROPIA II: a computationally efficient thermodynamic equilibrium model for K+–Ca2+–Mg2+–NH4+–Na+–SO42−–NO3−–Cl−–H2O aerosols." Atmospheric Chemistry and Physics Discussions 7, no. 1 (February 7, 2007): 1893–939. http://dx.doi.org/10.5194/acpd-7-1893-2007.
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Анотація:
Abstract. This study presents ISORROPIA II, a thermodynamic equilibrium model for the K+–Ca2+–Mg2+–NH4+–Na+–SO42−–NO3−–Cl−–H2O aerosol system. A comprehensive evaluation of its performance is conducted against the thermodynamic module SCAPE2 over a wide range of atmospherically relevant conditions. The two models overall agree well, to within 13% for aerosol water content and total PM mass, 16% for aerosol nitrate and 6% for aerosol chloride and ammonium. Largest discrepancies were found under conditions of low RH, primarily from differences in the treatment of water uptake and solid state composition. In terms of computational speed, ISORROPIA II was always found to be more than an order of magnitude faster than SCAPE2, with robust and rapid convergence under all conditions. The addition of crustal species does not slow down the thermodynamic calculations (compared to the older ISORROPIA code) because of optimizations in the activity coefficient calculation algorithm. Based on its computational rigor and performance, ISORROPIA II appears to be a highly attractive alternative for use in large scale air quality and atmospheric transport models.

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30

Fountoukis, C., and A. Nenes. "ISORROPIA II: a computationally efficient thermodynamic equilibrium model for K+–Ca2+–Mg2+–NH4+–Na+–SO42−–NO3−–Cl−–H2O aerosols." Atmospheric Chemistry and Physics 7, no. 17 (September 13, 2007): 4639–59. http://dx.doi.org/10.5194/acp-7-4639-2007.
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Анотація:
Abstract. This study presents ISORROPIA II, a thermodynamic equilibrium model for the K+–Ca2+–Mg2+–NH4+–Na+–SO42−–NO3−–Cl−–H2O aerosol system. A comprehensive evaluation of its performance is conducted against water uptake measurements for laboratory aerosol and predictions of the SCAPE2 thermodynamic module over a wide range of atmospherically relevant conditions. The two models agree well, to within 13% for aerosol water content and total PM mass, 16% for aerosol nitrate and 6% for aerosol chloride and ammonium. Largest discrepancies were found under conditions of low RH, primarily from differences in the treatment of water uptake and solid state composition. In terms of computational speed, ISORROPIA II was more than an order of magnitude faster than SCAPE2, with robust and rapid convergence under all conditions. The addition of crustal species does not slow down the thermodynamic calculations (compared to the older ISORROPIA code) because of optimizations in the activity coefficient calculation algorithm. Based on its computational rigor and performance, ISORROPIA II appears to be a highly attractive alternative for use in large scale air quality and atmospheric transport models.

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31

Spiridonova, Tatyana S., Aleksandra A. Savina, Evgeniy V. Kovtunets, and Elena G. Khaikina. "New triple molybdate and tungstate Na5Rb7Sc2(XO4)9 (X = Mo, W)." Chimica Techno Acta 8, no. 4 (December 16, 2021): 20218412. http://dx.doi.org/10.15826/chimtech.2021.8.4.12.
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Анотація:
New compounds of the composition Na5Rb7Sc2(XO4)9 (X = Mo, W) were obtained via the ceramic technology. The sequences of chemical transformations occurring during the formation of these compounds were established, and their primary characterization was performed. Both Na5Rb7Sc2(XO4)9 (X = Mo, W) were found to melt incongruently at 857 K (X = Mo) and 889 K (X = W). They are isostructural to Ag5Rb7Sc2(XO4)9 (X = Mo, W), Na5Cs7Ln2(MoO4)9 (Ln = Tm, Yb, Lu) and crystallize in the trigonal crystal system (sp. gr. R32). The crystal structures were refined with the Rietveld method using the powder X-ray diffraction data. The thermal expansion of Na5Rb7Sc2(WO4)9 was studied by high-temperature powder X-ray diffraction; it was shown that this triple tungstate belongs to high thermal expansion materials.

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32

Rajasekhar, D., P. S. Deepak Sankar, Anantha Krishna Rao, D. Narendrakumar, and K. Ramasundaram. "Reliability Assessment and System Performance Improvement of ORV Sagar Nidhi Propulsion System." Current Science 118, no. 11 (June 10, 2020): 1782. http://dx.doi.org/10.18520/cs/v118/i11/1782-1785.
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33

Stephens, B. B., N. L. Miles, S. J. Richardson, A. S. Watt, and K. J. Davis. "Atmospheric CO2 monitoring with single-cell NDIR-based analyzers." Atmospheric Measurement Techniques Discussions 4, no. 4 (July 8, 2011): 4325–55. http://dx.doi.org/10.5194/amtd-4-4325-2011.
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Анотація:
Abstract. We describe CO2 concentration measurement systems based on relatively inexpensive single-cell non-dispersive infrared CO2 sensors. The systems utilize signal averaging to obtain precision (1-σ in 100 s) of 0.1 parts per million dry air mole fraction (ppm), frequent calibrations and sample drying in order to achieve state-of-the-art compatibility, and can run autonomously for months at a time. Laboratory tests indicate compatibility among four to six systems to be ±0.1 ppm (1-σ), and field measurements of known reference-gases yield median errors of 0.01 to 0.17 ppm with 1-σ variance of ±0.1 to 0.2 ppm. From May to August 2007, a system co-located with a NOAA-ESRL dual-cell NDIR system at the WLEF tall tower in Wisconsin measured daytime-only daily averages of CO2 that differ by 0.26 ± 0.15 ppm (median ± 1 σ), and from August 2005 to April 2011 a system co-located with weekly NOAA-ESRL network flask collection at Niwot Ridge, Colorado measured coincident CO2 concentrations that differed by −0.06 ± 0.30 ppm (n = 585). Data from these systems are now supporting a wide range of analyses and this approach may be applicable in future studies where accuracy and initial cost of the sensors are priorities.

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34

Stephens, B. B., N. L. Miles, S. J. Richardson, A. S. Watt, and K. J. Davis. "Atmospheric CO2 monitoring with single-cell NDIR-based analyzers." Atmospheric Measurement Techniques 4, no. 12 (December 14, 2011): 2737–48. http://dx.doi.org/10.5194/amt-4-2737-2011.
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Анотація:
Abstract. We describe CO2 concentration measurement systems based on relatively inexpensive single-cell non-dispersive infrared CO2 sensors. The systems utilize signal averaging to obtain precision (1-σ in 100 s) of 0.1 parts per million dry air mole fraction (ppm), frequent calibrations and sample drying in order to achieve state-of-the-art compatibility, and can run autonomously for months at a time. Laboratory tests indicate compatibility among four to six systems to be ±0.1 ppm (1-σ), and field measurements of known reference-gases yield median errors of 0.01 to 0.17 ppm with 1-σ variance of ±0.1 to 0.2 ppm. From May to August 2007, a system co-located with a NOAA-ESRL dual-cell NDIR system at the WLEF tall tower in Wisconsin measured daytime-only daily averages of CO2 that differ by 0.26 ± 0.15 ppm (median ± 1 σ), and from August 2005 to April 2011 a system co-located with weekly NOAA-ESRL network flask collection at Niwot Ridge, Colorado measured coincident CO2 concentrations that differed by −0.06 ± 0.30 ppm (n = 585). Data from these systems are now supporting a wide range of analyses and this approach may be applicable in future studies where accuracy and initial cost of the sensors are priorities.

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35

Lanovsky, R. A., A. V. Nikitsin, M. V. Bushinsky, N. V. Tereshko, O. S. Mantytskaya та M. V. Bushinsky. "Fеatures of exchange interactions of the B-sublattice ions in the La0,5Sr0,5Co1–x Nix O3–d system". Doklady of the National Academy of Sciences of Belarus 65, № 5 (8 листопада 2021): 539–45. http://dx.doi.org/10.29235/1561-8323-2021-65-5-539-545.
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Анотація:
A comprehensive study of the crystal structure, magnetic and magnetotransport properties of the La0.5Sr0.5Co1–x Nix O3–d cobaltite system (x = 0.1–0.16) was carried out. The X-ray measurement results indicate that the unit cell of all solid solutions of the system is cubic and is described by the space group Pm3m. It is found that with an increase in the 540 Doklady of the National Academy of Sciences of Belarus, 2021, vol. 65, no. 5, рр. 539–545 Ni content, the Curie temperature (TC) decreases from 230 to 180 K, as well as magnetization values. The magnetic transition is blurred across the field. The iodometric studies show that the concentration of Co4+ ions in all samples does not exceed 35 %. The chemical substitution of Co ions by Ni ones does not result in significant modification of the unit cell parameters, which may indicate a spin crossover of Co ions. The temperature dependence of resistivity is metallic in character, which indicates the stability of the main conducting ferromagnetic phase. The nature of exchange interactions of different signs between B-sublattice ions completely determines the behavior of the system. An increase in the content of Ni ions leads both to decrease the component of ferromagnetic exchange interactions between Co3+ ions in the intermediate spin state and to increase the fraction of antiferromagnetic and weaker ferromagnetic interactions. In addition, presumably the Co4+ ion can stabilize the high spin state of the closestCo3+ ion and in the next two coordination spheres it can stabilize the Co3+ ion in the low spin state, i. e. the ferromagnetic complexes Co4+–Co3+ (HS) are shielded by the diamagnetic shell of low spin Co3+ ions, which results in decreasing the magnetization values.

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36

Matiyev, A. K., R. T. Uspazhiev, T. A. Matieva, K. I. Khamsurkaev, L. I. Israilova, A. D. Israfilov, K. I. Dolakova та A. K. Yusupov. "Electro-Optical Properties in β- Tl1-xCuxInS2(0≤X≤0,015) Crystals". Key Engineering Materials 909 (4 лютого 2022): 169–74. http://dx.doi.org/10.4028/p-1yp7d9.
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Анотація:
The paper presents the results of experimental studies of the electro-optical properties of β-Tl1-xCuxInS2 (0 X 0,015) single crystals. It was found that in measurements of the induced birefringence, the transmission of the polarizer - crystal - analyzer (P-C-A) system is nonzero both for the presence of an external electric E = 0 and in its absence, which is apparently associated with the presence of internal fields arising in crystals during their growth ().

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37

Gullett, Brian, Johanna Aurell, William Mitchell, and Jennifer Richardson. "Use of an unmanned aircraft system to quantify NOx emissions from a natural gas boiler." Atmospheric Measurement Techniques 14, no. 2 (February 9, 2021): 975–81. http://dx.doi.org/10.5194/amt-14-975-2021.
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Abstract. Aerial emission sampling of four natural gas boiler stack plumes was conducted using an unmanned aerial system (UAS) equipped with a lightweight sensor–sampling system (the “Kolibri”) for measurement of nitrogen oxide (NO), and nitrogen dioxide (NO2), carbon dioxide (CO2), and carbon monoxide (CO). Flights (n = 22) ranged from 11 to 24 min in duration at two different sites. The UAS was maneuvered into the plumes with the aid of real-time CO2 telemetry to the ground operators and, at one location, a second UAS equipped with an infrared–visible camera. Concentrations were collected and recorded at 1 Hz. The maximum CO2, CO, NO, and NO2 concentrations in the plume measured were 10 000, 7, 27, and 1.5 ppm, respectively. Comparison of the NOx emissions between the stack continuous emission monitoring systems and the UAS–Kolibri for three boiler sets showed an average of 5.6 % and 3.5 % relative difference for the run-weighted and carbon-weighted average emissions, respectively. To our knowledge, this is the first evidence of the accuracy performance of UAS-based emission factors against a source of known strength.

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38

Kawamata, Shinichi, Yusuke Watanabe, and Takashi Unseki. "Development of Onboard CO2 Capture System." Marine Engineering 57, no. 6 (November 1, 2022): 778–83. http://dx.doi.org/10.5988/jime.57.778.
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39

Jacob, Reenu, Harikrishnan G. Nair, and Jayakumari Isac. "Structural and Morphological Studies of Nanocrystalline Ceramic BaSr0.9Fe0.1TiO4." International Letters of Chemistry, Physics and Astronomy 41 (November 4, 2014): 100–117. http://dx.doi.org/10.56431/p-y2w34p.
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Анотація:
The development of lead-free piezoelectric materials have gained great attention for the consideration of environmental protection. Nanosized BaSr0.9Fe0.1TiO4, a lead free perovskite phase structured ceramic was prepared via a high-energy ball milling process through mechanically assisted synthesis. The sample was analyzed by X-ray Diffraction (XRD), SEM and EDX. The XRD results and XPERT-PRO software analysis confirmed the orthorhombic system of the sample. Scanning Electron Microscopy (SEM) analysis revealed that its crystallite size is in the nanometer range. The grain size was less than 100 nm and showed a strong tendency for agglomeration. It also confirmed with the calculated value from Debye Scherrer’s formula. EDX spectrum shows the elemental composition of the sample. Williamson-Hall Plot method was used to evaluate the size and lattice strain. The dislocation density and the morphology index of the sample were also calculated.

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40

Jacob, Reenu, Harikrishnan G. Nair, and Jayakumari Isac. "Structural and Morphological Studies of Nanocrystalline Ceramic BaSr0.9Fe0.1TiO4." International Letters of Chemistry, Physics and Astronomy 44 (January 14, 2015): 95. http://dx.doi.org/10.56431/p-i43k14.
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Анотація:
The development of lead-free piezoelectric materials have gained great attention for the consideration of environmental protection. Nanosized BaSr0.9Fe0.1TiO4, a lead free perovskite phase structured ceramic was prepared via a high-energy ball milling process through mechanically assisted synthesis. The sample was analyzed by X-ray Diffraction (XRD), SEM and EDX. The XRD results and XPERT-PRO software analysis confirmed the orthorhombic system of the sample. Scanning Electron Microscopy (SEM) analysis revealed that its crystallite size is in the nanometer range. The grain size was less than 100 nm and showed a strong tendency for agglomeration. It also confirmed with the calculated value from Debye Scherrer’s formula. EDX spectrum shows the elemental composition of the sample. Williamson-Hall Plot method was used to evaluate the size and lattice strain. The dislocation density and the morphology index of the sample were also calculated.

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41

Sulpis, Olivier, Siv K. Lauvset, and Mathilde Hagens. "Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions." Ocean Science 16, no. 4 (July 21, 2020): 847–62. http://dx.doi.org/10.5194/os-16-847-2020.
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Анотація:
Abstract. Seawater absorption of anthropogenic atmospheric carbon dioxide (CO2) has led to a range of changes in carbonate chemistry, collectively referred to as ocean acidification. Stoichiometric dissociation constants used to convert measured carbonate system variables (pH, pCO2, dissolved inorganic carbon, total alkalinity) into globally comparable parameters are crucial for accurately quantifying these changes. The temperature and salinity coefficients of these constants have generally been experimentally derived under controlled laboratory conditions. Here, we use field measurements of carbonate system variables taken from the Global Ocean Data Analysis Project version 2 and the Surface Ocean CO2 Atlas data products to evaluate the temperature dependence of the carbonic acid stoichiometric dissociation constants. By applying a novel iterative procedure to a large dataset of 948 surface-water, quality-controlled samples where four carbonate system variables were independently measured, we show that the set of equations published by Lueker et al. (2000), currently preferred by the ocean acidification community, overestimates the stoichiometric dissociation constants at temperatures below about 8 ∘C. We apply these newly derived temperature coefficients to high-latitude Argo float and cruise data to quantify the effects on surface-water pCO2 and calcite saturation states. These findings highlight the critical implications of uncertainty in stoichiometric dissociation constants for future projections of ocean acidification in polar regions and the need to improve knowledge of what causes the CO2 system inconsistencies in cold waters.

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42

Modi, Kunal B., Suraj J. Shah, Chetan R. Kathad, and Pooja U. Sharma. "Pre and Post Effect of Swift Heavy Ion Irradiation on Infrared Spectral Evolution of Y3+xFe5-xO12 (x = 0.0 - 1.0) System." International Letters of Chemistry, Physics and Astronomy 44 (January 14, 2015): 66–72. http://dx.doi.org/10.56431/p-w8d173.
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Present work aims to investigate the effect of Y3+ - substitution and 50 MeV, Li3+ ion irradiation (fluence: 5 x 1013 ions/cm2) on infrared spectral evolution of Y3+xFe5-xO12 (x = 0.0, 0.2 0.4, 0.6, 0.8 and 1.0) garnet system. Infrared absorption spectra for x = 0.0 – 0.6 compositions show three absorption bands while x = 0.8 – 1.0 compositions are characterized by two absorption bands, identical with IR spectra of rare earth ortho ferrites. The position and intensity of bands are found to be influenced by Y3+ - substitution. The intensity of absorption bands for x = 0.0 – 0.4 compositions is found to increase, while for x = 0.6 – 1.0 compositions no effect of swift heavy ion irradiation has been observed. The results have been explain in the light of SHII induced defect states, partial removal of un-wanted YFeO3 phase and change in structural parameters. It seems that YFeO3 phase is irradiation hard phase.

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43

Ahmad, Usman, Waqas Anjum, and Syed Mahad Ali Bukhari. "H2 and H∞ Controller Design of Twin Rotor System (TRS)." Intelligent Control and Automation 04, no. 01 (2013): 55–62. http://dx.doi.org/10.4236/ica.2013.41008.
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44

Rosenstock, Nicholas P., Patrick A. W. van Hees, Petra M. A. Fransson, Roger D. Finlay, and Anna Rosling. "Biological enhancement of mineral weathering by Pinus sylvestris seedlings – effects of plants, ectomycorrhizal fungi, and elevated CO2." Biogeosciences 16, no. 18 (September 26, 2019): 3637–49. http://dx.doi.org/10.5194/bg-16-3637-2019.
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Abstract. Better understanding and quantifying the relative influence of plants, associated mycorrhizal fungi, and abiotic factors such as elevated CO2 on biotic weathering is essential to constraining weathering estimates. We employed a column microcosm system to examine the effects of elevated CO2 and Pinus sylvestris seedlings, with or without the ectomycorrhizal fungi Piloderma fallax and Suillus variegatus, on rhizosphere soil solution concentrations of low-molecular-weight organic acids (LMWOAs) and on the weathering of primary minerals. Seedlings significantly increased mineral weathering, as estimated from elemental budgets of Ca, K, Mg, and Si. Elevated CO2 increased plant growth and LMWOA concentrations but had no effect on weathering. Colonization by ectomycorrhizal fungi, particularly P. fallax, showed some tendency to increase weathering. LMWOA concentrations correlated with seedling biomass across both CO2 and mycorrhizal treatments but not with total weathering. We conclude that nutrient uptake, which reduces transport limitation to weathering, is the primary mechanism by which plants enhanced weathering in this system. While the experimental system used departs from conditions in forest soils in a number of ways, these results are in line with weathering studies performed at the ecosystem, macrocosm, and microcosm scale, indicating that nutrient uptake by plants and microbes is an important biological mechanism by which mineral weathering is enhanced.

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Le Weng, Le Weng, Chao Feng Le Weng, Zhi-Yuan Shi Chao Feng, Ying-Min Zhang Zhi-Yuan Shi, and Lian-Fen Huang Ying-Min Zhang. "FASSFuzzer—An Automated Vulnerability Detection System for Android System Services." 電腦學刊 33, no. 2 (April 2022): 189–200. http://dx.doi.org/10.53106/199115992022043302017.
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As the core component of Android framework, Android system services provide a large number of basic and core function services for Android system. It has a lot of resources and very high system permissions. And for the Android system, it is a very important attack surface. Attackers can use Android system service vulnerabilities to steal user privacy, cause Android applications or Android system denial of service, remote malicious code execution and other malicious behaviors, which will seriously affect the security of Android users. Based on fuzzy testing technology, this paper designed and implemented a vulnerability mining system for Android system services, optimized and improved the fuzzy testing method, so as to improve the speed and effectiveness of vulnerability mining, and timely submitted the discovered vulnerabilities to the corresponding manufacturers and security agencies, to help Android manufacturers repair the vulnerabilities in time. The main work of this paper is as follows: Aiming at the null pointer reference vulnerability of Android system services, we designed and implemented an automatic fast mining system FASSFuzzer. FASSFuzzer uses ADB to quickly detect null pointer reference vulnerabilities in Android services. At the same time, FASSFuzzer added automatic design to automatically perceive the generation of vulnerabilities and ensure the full automation of the whole vulnerability mining process, and automatically generate a vulnerability mining report after the completion of vulnerability mining.  

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46

Le Weng, Le Weng, Chao Feng Le Weng, Zhi-Yuan Shi Chao Feng, Ying-Min Zhang Zhi-Yuan Shi, and Lian-Fen Huang Ying-Min Zhang. "FASSFuzzer—An Automated Vulnerability Detection System for Android System Services." 電腦學刊 33, no. 2 (April 2022): 189–200. http://dx.doi.org/10.53106/199115992022043302017.
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Анотація:
As the core component of Android framework, Android system services provide a large number of basic and core function services for Android system. It has a lot of resources and very high system permissions. And for the Android system, it is a very important attack surface. Attackers can use Android system service vulnerabilities to steal user privacy, cause Android applications or Android system denial of service, remote malicious code execution and other malicious behaviors, which will seriously affect the security of Android users. Based on fuzzy testing technology, this paper designed and implemented a vulnerability mining system for Android system services, optimized and improved the fuzzy testing method, so as to improve the speed and effectiveness of vulnerability mining, and timely submitted the discovered vulnerabilities to the corresponding manufacturers and security agencies, to help Android manufacturers repair the vulnerabilities in time. The main work of this paper is as follows: Aiming at the null pointer reference vulnerability of Android system services, we designed and implemented an automatic fast mining system FASSFuzzer. FASSFuzzer uses ADB to quickly detect null pointer reference vulnerabilities in Android services. At the same time, FASSFuzzer added automatic design to automatically perceive the generation of vulnerabilities and ensure the full automation of the whole vulnerability mining process, and automatically generate a vulnerability mining report after the completion of vulnerability mining.  

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Du, Yeqin, Di Zhang, Sai Wang, Lei Wang, Xingfu Yan, and Zhanhui Tang. "Sexual system characteristics of Lilium concolor var. megalanthum in peatland." Biodiversity Science 29, no. 10 (2021): 1321–35. http://dx.doi.org/10.17520/biods.2021081.
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48

Nasir, Mohd, Mohd Abdul Majeed Khan, Mushahid Husain, and Mohammad Zulfequar. "Thermal Properties of Se100–xZnx Glassy System." Materials Sciences and Applications 02, no. 05 (2011): 289–98. http://dx.doi.org/10.4236/msa.2011.25038.
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49

Fukuda, R., and T. Iwaida. "Service Navigation System (sNs) – A novel nursing care record system." Gerontechnology 17, s (April 24, 2018): 129. http://dx.doi.org/10.4017/gt.2018.17.s.125.00.
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50

Koschorreck, Matthias, Yves T. Prairie, Jihyeon Kim, and Rafael Marcé. "Technical note: CO2 is not like CH4 – limits of and corrections to the headspace method to analyse pCO2 in fresh water." Biogeosciences 18, no. 5 (March 9, 2021): 1619–27. http://dx.doi.org/10.5194/bg-18-1619-2021.
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Abstract. Headspace analysis of CO2 frequently has been used to quantify the concentration of CO2 in fresh water. According to basic chemical theory, not considering chemical equilibration of the carbonate system in the sample vials will result in a systematic error. By analysing the potential error for different types of water and experimental conditions, we show that the error incurred by headspace analysis of CO2 is less than 5 % for typical samples from boreal systems which have low alkalinity (< 900 µmol L−1), with pH < 7.5, and high pCO2 (> 1000 µatm). However, the simple headspace calculation can lead to high error (up to −300 %) or even impossibly negative values in highly undersaturated samples equilibrated with ambient air, unless the shift in carbonate equilibrium is explicitly considered. The precision of the method can be improved by lowering the headspace ratio and/or the equilibration temperature. We provide a convenient and direct method implemented in an R script or a JMP add-in to correct CO2 headspace results using separately measured alkalinity.

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