检索结果-南通市图书馆

SARS-CoV-2 and innate immunity:the good,the bad,and the"goldilocks"

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2024年第2期21卷 171-183页

作者： Benjamin L.Sievers Mark T.K.Cheng kata Csiba Bo Meng Ravindra K.Gupta Department of Medicine University of CambridgeCambridgeUK Cambridge Institute of Therapeutic Immunology&Infectious Disease(CITID) Department of MedicineUniversity of CambridgeCambridgeUk

An ancient conflict between hosts and pathogens has driven the innate and adaptive arms of *** about this interplay can not only help us identify biological mechanisms but also reveal pathogen vulnerabilities that can be leveraged *** humoral response to SARS-CoV-2 infection has been the focus of intense research,and the role of the innate immune system has received significantly less ***,we review current knowledge of the innate immune response to SARS-CoV-2 infection and the various means SARS-CoV-2 employs to evade innate defense *** also consider the role of innate immunity in SARS-CoV-2 vaccines and in the phenomenon of long COVID.

关键词： SARS-CoV-2 Innate immune response Interferon Cytokines Inflammation Antiviral targets

Effect of Y substitution on the microstructure,magneto-optical,and thermal properties of(Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)transparent ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第4期13卷 529-538页

作者： Lixuan Zhang Dianjun Hu Xiao Li Ziyu Liu Chen Hu Lexiang Wu Tingsong Li dariusz Hreniak Jiang Li Transparent Ceramics Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland

Faraday isolators can prevent the front-end system from disturbance and damage caused by a back-reflected beam,so they are important elements in laser *** magneto-optical materials are the most important component in Faraday isolators,the studies on magneto-optical materials have attracted much attention these ***_(3)Al_(5)O_(12)(TAG)ceramics are considered to be one of the most promising magneto-optical materials for visible to near-infrared wavelength band application because of their outstanding comprehensive magneto-optical ***,the optical quality of TAG ceramics needs further optimization to meet the application *** this work,high optical quality(Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)(x=0,0.05,0.1,0.2,and 0.3)magneto-optical ceramics were fabricated successfully by solid-state reaction sintering combined with hot isostatic pressing(HIP)*** the ceramics obtained showed a single garnet phase for different values of x in the range *** addition of Y_(2)O_(3) was found to suppress the secondary phase and improve optical quality *** ceramic samples obtained had clear grain boundaries and possessed the in-line transmittance values of 82.9%at 1064 nm and 82.2%at 633 nm,*** Verdet constants of(Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)ceramics with x=0,0.05,0.1,0.2,and 0.3 were−188.1,−175.4,−168.5,−143.0,and−119.9 rad/(T·m),*** thermal conductivity of TAG ceramics was found to be 5.23 W/(m·K)at 25℃,and when 20%Y was substituted in place of Tb,the thermal conductivity decreased by only 9.4%.

关键词： (Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)ceramics magneto-optical materials optical quality thermal properties

Spin order and dynamics in the topological rare-earth germanide semimetals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第10期Mechanics & Astronomy) .卷 117-131页

作者： Yuhao Wang Zhixuan Zhen Jing Meng Igor Plokhikh Delong Wu dariusz J.Gawryluk Yang Xu Qingfeng Zhan Ming Shi Ekaterina Pomjakushina Toni Shiroka Tian Shang Key Laboratory of Polar Materials and Devices (MOE) School of Physics and Electronic ScienceEast China Normal University Laboratory for Multiscale Materials and Experiments Paul Scherrer Institut Center for Correlated Matter and School of Physics Zhejiang University Laboratory for Muon-Spin Spectroscopy Paul Scherrer Institut Laboratorium für Festk?rperphysik ETH Zürich

The REAl（Si,Ge）(RE = rare earth) family, known to break both the inversion-and time-reversal symmetries, represents one of the most suitable platforms for investigating the interplay between correlated-electron phenomena and topologically nontrivial ***, we report on systematic magnetic, transport, and muon-spin rotation and relaxation（μSR） measurements on（Nd,Sm）AlGe single crystals, which exhibit antiferromagnetic（AFM） transitions at TN=6.1 and 5.9 K, respectively. In addition, NdAlGe undergoes also an incommensurate-to-commensurate ferrimagnetic transition at 4.5 K. Weak transverse-field μSR measurements confirm the AFM transitions, featuring a ～90% magnetic volume fraction. Zero-field（ZF） μSR measurements reveal a more disordered internal field distribution in NdAlGe than in SmAlGe, reflected in a larger transverse muon-spin relaxation rate λTat T■TN. This may be due to the complex magnetic structure of NdAlGe, which undergoes a series of metamagnetic transitions in an external magnetic field, while SmAlGe shows only a robust AFM order. In NdAlGe, the topological Hall effect（THE） appears between the first and the second metamagnetic transitions for H‖c, while it is absent in SmAlGe. Such THE in NdAlGe is most likely attributed to the field-induced topological spin textures. The longitudinal muon-spin relaxation rate λL, diverges near the AFM order, followed by a clear drop at T < T＿N. In the magnetically ordered state, spin fluctuations are significantly stronger in NdAlGe than in SmAlGe. In general, our longitudinal-field μSR data indicate vigorous spin fluctuations in NdAlGe, thus providing valuable insights into the origin of THE and of the possible topological spin textures in REAl（Si,Ge） Weyl semimetals.

关键词： magnetic Weyl semimetals topological Hall effect spin fluctuations µSR

同方期刊数据库

基于碳化钼材料CO_(2)加氢制备高附加值化学品的热催化研究进展

在线全文

学校读者我要写书评

暂无评论

物理化学学报 2024年第4期40卷 26-51页

作者：徐勇庆杨玉瑶武孟娜杨潇潇别璇张时语李清海张衍国张宸伟 Robert EPrzekop Bogna Sztorch dariusz Brzakaski 周会清华大学能源与动力工程系热科学与动力工程教育部重点实验室二氧化碳资源利用与减排技术北京市重点实验室北京100084 Centre for Advanced Technologies Adam Mickiewicz University in PoznanPoznan 61-614 Poland

CO_(2)加氢对于CO_(2)转化制备高附加值化学品和燃料以实现二氧化碳利用及能源储存至关重要。CO_(2)加氢包括甲烷化、逆水煤气变换、甲醇化和CO_(2)直接费托合成等。碳化钼,尤其是其二维材料,由于其低成本和良好的性能而备受关注。在CO_... 详细信息

CO_(2)加氢对于CO_(2)转化制备高附加值化学品和燃料以实现二氧化碳利用及能源储存至关重要。CO_(2)加氢包括甲烷化、逆水煤气变换、甲醇化和CO_(2)直接费托合成等。碳化钼,尤其是其二维材料,由于其低成本和良好的性能而备受关注。在CO_(2)加氢反应中,由于碳的渗入,导致晶格膨胀以及价电子增加,碳化钼基催化剂展现出了类似于贵金属催化剂的性质。碳化钼可以通过程序升温渗碳法、选择性蚀刻法、机械合金合成法、化学气相沉积法、原位热渗碳法以及溶液相合成法等来制备。到目前为止,学者已经对基于碳化钼的材料的CO_(2)转化进行大量研究,这些材料具有良好的CO_(2)转化活性和对目标产物的选择性。碳化钼材料的催化性能可以通过调节碳化钼中的C/Mo比、在碳化钼与负载金属之间建立强的金属-载体相互作用以及调整材料的界面结构来实现。然而,基于碳化钼的热催化CO_(2)转化仍处于初级阶段。本文综述基于碳化钼的热催化CO_(2)加氢制备高附加值化学品和燃料的研究进展,并分析其面临的挑战和机遇。

关键词： CO_(2)加氢碳化钼热催化异相催化 MXenes

New Leiderman–Khlystov Coefficients for Estimating Engine Full Load Characteristics and Performance

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2019年第6期32卷 192-205页

作者： dariusz Szpica Department of Mechanical Engineering Bialystok University of Technology

The paper presents a method of calculating the full load engine characteristics based on the Leiderman–Khlystov relation. Because the values of the coefficients of the discussed function available in literature were determined for obsolete engine designs, an attempt was made to update them. To this end, a chassis dynamometer was used where a database of results had been built for a variety of vehicles. Following the data collection, the coefficients for variety of fueling system(six groups: fuel injected gasoline and turbocharged gasoline, spark ignition LPG Ⅰ–Ⅱ and Ⅳ generation, naturally aspirated diesel and turbocharged diesel) were determined. The identification of the coefficients was carried out in Matlab-Simulink indicating the applicability of the said function for most of the engines, yet the recent popularity of turbocharged gasoline engines requires an additional analysis of the possibility of use of a different functional description. The full load engine characteristics is a basis for the vehicle performance characteristics and, further, for modeling of traffic in a variety of aspects of the vehicle operation.

关键词： Passenger car Combustion engines Full load engine characteristics Numerical identification

Production of rhamnolipids-producing enzymes of Pseudomonas in E. coli and structural characterization

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2017年第1期11卷 133-138页

作者： kata Kiss Wei Ting Ng Qingxin Li Institute of Chemical & Engineering Sciences Agency for Science Technology and Research Jurong Island 627833 Singapore

Rhamnolipids are a class ofbiosurfactants that have a great potential to be used in industries. Five proteins/enzymes, namely RhlA, RhlB, RhlC, RhlG and RhlI, are critical for the production of rhamnolipids in Pseudomonas aeruginosa. Four of the 5 proteins except RhlC were successfully over-expressed in E. coli and three of them （RhlA, RhlB and RhlI） were purified and obtained in milligram quantities. The purified proteins were shown to be folded in solution. Homology models were built for RhlA, RhlB and RhlI. These results lay a basis for further structural and functional characterization of these proteins in vitro to favor the construction of super strains for rhamnolipids production.

关键词： rhamnolipids Pseudomonas RhlA RhlB,RhlI protein folding

Coefficient of Engine Flexibility as a Basis for the Assessment of Vehicle Tractive Performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2019年第3期32卷 189-197页

作者： dariusz Szpica Faculty of Mechanical Engineering Bialystok University of Technology

The paper attempts to analyze full load characteristics of over 500 combustion engines. Using statistical tools, the author determined the value of the coe cient of flexibility. Engine flexibility is the capability of the engine to adapt to varying loads. Importantly, in the investigations, the author took into account the parameters calculated in the course of the investigations on a chassis dynamometer, i.e., actual, not taken from technical specifications of brand new vehicles. Di erent stages of operating wear allow a better characterization of the population. Subsequent utilization of the results in tractive calculations is more reliable. The engines were divided into in six groups, depending on the type of fuel system: fuel injected gasoline and turbocharged gasoline, spark ignition LPG, naturally aspirated diesel and turbocharged diesel. However, engines running on alternative fuels are characterized with a greater flexibility than the fuel injected base engines. Conformity of flexibility of fuel injected and LPG IV generation engines have been observed,which confirms the appropriateness of engine adaptation to alternative fueling. Gasoline engine supercharging allowed a reduction of the maximum engine speed of the maximum torque, which extends the range of analyzable speeds for flexibility and consequently, the flexibility as such.

关键词： Vehicle Tractive performance Flexibility coe cient Engine characteristics

共沉淀纳米粉体制备Yb:ScO透明陶瓷的微结构与光学性能（英文）

在线全文

学校读者我要写书评

暂无评论

无机材料学报 2024年

作者：叶君豪周真真胡辰王雁斌荆延秋李廷松程梓秋吴俊林 IVANOV Maxim HRENIAK dariusz 李江中国科学院上海硅酸盐研究所透明陶瓷研究中心中国科学院大学材料科学与光电工程中心塞尔维亚共和国国家研究所Vin?a核科学研究所光电转换卓越中心俄罗斯科学院乌拉尔分院电物理研究所波兰科学院低温与结构研究所

Sc2O3作为固体激光增益材料的基质，具有热导率高、与激活离子匹配性好等优点，在高功率固体激光应用中有着广阔的应用前景。目前，Yb掺杂的Sc2O3陶瓷可以在很高的烧结温度下合成，但陶瓷的光学质量和烧结温度还有待进一步优化。本文采... 详细信息

Sc2O3作为固体激光增益材料的基质，具有热导率高、与激活离子匹配性好等优点，在高功率固体激光应用中有着广阔的应用前景。目前，Yb掺杂的Sc2O3陶瓷可以在很高的烧结温度下合成，但陶瓷的光学质量和烧结温度还有待进一步优化。本文采用共沉淀法制备了5%Yb:Sc2O3（掺杂量为质量分数）纳米粉体，并采用真空预烧结和热等静压（Hot Isostatic Pressing， HIP）后处理制备了5%Yb:Sc2O3透明陶瓷。从热重分析、XRD以及扫描电镜的结果，证明了碳酸氢铵共沉淀法能得到分散性好、平均晶粒尺寸29 nm的立方相Yb:Sc2O3纳米粉体。详细研究了真空预烧温度（1500～1700 ℃）对Yb:Sc2O3陶瓷的致密化过程、微观结构变化及光学透过率的影响。结果表明，所有样品均具有均匀的微观结构，且随着烧结温度的升高，样品的平均晶粒尺寸增大。值得注意的是，1550 ℃预烧的Yb:Sc2O3陶瓷经HIP后处理后，在1100 nm处的最佳直线透过率达到78.1%（理论值为80%）。同时，还评估了Yb:Sc2O3陶瓷的光谱性能。5% Yb:Sc2O3陶瓷的最小粒子数反转参数β和发光衰减时间分别为0.041和0.49 ms。通过本工作，Yb:Sc2O3的光学质量得到了优化，并将最佳真空烧结温度控制在较低的温度（1550 ℃）。综上所述，采用共沉淀法成功制备了Yb:Sc2O3纳米粉体，通过1550 ℃真空预烧结和HIP后处理制备出了光学质量良好的透明陶瓷。

关键词：纳米粉体 Yb:Sc O 透明陶瓷热等静压烧结光学性能

The role of tree uprooting in the transporting of sediment and mixing of soil in the Tatra Mountains

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2021年第1期18卷 38-50页

作者： dariusz STRZYŻOWSKI Institute of Geography and Spatial Management Jagiellonian UniversityGronostajowa 7Kraków 30-387Poland

Tree uprooting is an important process which leads to many geomorphic *** of the most important are the transport of sediment and mixing of *** aim of this article is to make a detailed examination of the magnitude of sediment transport caused by an extreme windthrow event in three severely affected ***,a comparison is made of the windthrow event with a mass movement event in the aspect of the magnitude of sediment transport and soil *** study was conducted in three second-to third-order catchments in the Tatra Mountains,where a strong foehn wind event caused extensive windthrow in 2013,and a high-magnitude rainfall event triggered mass movements in *** volume of sediment uplifted by the uprooting event was calculated based on the mapping of root plates using high-resolution(0.04 m)aerial images and measurements of root plate volumes conducted in the *** volume of sediment transported by shallow landslides was determined based on a Digital Elevation Model(DEM1-m resolution).Windthrows affected 34%,76%,and94%of the area of the investigated *** of the trees had fallen *** direction of treefall was influenced by the slope aspect and *** plates and pits covered 1.3%,4.8%,and 5.4%of the area of the *** flux generated by the uprooting event,calculated for the entire area of each investigated catchment ranged from 8.1×10^(–4) to 9.9×10^(–3) m^(3) m^(–1) event^(–1).This was notably lower than the sediment flux generated by the mass movement event(also calculated for the entire area of each catchment),which was 1.8-6.1×10^(–2)m^(3) m^(–1) event^(–1).By contrast,uprooting affected a much larger area than the mass movement event,which underlines its significant role in the mixing of soil.

关键词： Tree uprooting Windthrow event Slope processes Sediment flux Tatra Mountains