检索结果-南通市图书馆

Correlation between multi-factor phase diagrams and complex electrocaloric behaviors in PNZST antiferroelectric ceramic system

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 2023年第3期12卷 463-473页

作者： Junjie Li Ruowei yin Jianting Li Xiaopo su Yanjing su Lijie Qiao Yang Baia Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China Faculty of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Ferroelectric(FE)phase transition with a large polarization change benefits to generate large electrocaloric(EC)effect for solid-sate and zero-carbon cooling ***,most EC studies only focus on the single-physical factor associated phase ***,we initiated a comprehensive discussion on phase transition in Pb_(0.99)Nb_(0.02)[(Zr_(0.6)Sn_(0.4))1−xTix]_(0.98)O_(3)(PNZST100x)antiferroelectric(AFE)ceramic system under the joint action of multi-physical factors,including composition,temperature,and electric *** to low energy barrier and enhanced zero-field entropy,the multi-phase coexistence point(x=0.12)in the composition–temperature phase diagram yields a large positive EC peak of maximum temperature change(ΔT_(max))=2.44 K(at 40 kV/cm).Moreover,the electric field–temperature phase diagrams for four representative ceramics provide a more explicit guidance for EC evolution *** the positive EC peaks near various phase transition temperatures,giant positive EC effects are also brought out by the electric field-induced phase transition from tetragonal AFE(AFET)to low-temperature rhombohedral FE(FER),which is reflected by a positive-slope boundary in the electric field–temperature phase diagram,while significant negative EC responses are generated by the phase transition from AFET to high-temperature multi-cell cubic paraelectric(PEMCC)with a negative-slope phase *** work emphasizes the importance of phase diagram covering multi-physical factors for high-performance EC material design.

关键词： antiferroelectric(AFE) electrocaloric(EC)effect phase diagram phase transition

Patients with cirrhosis during the COVID-19 pandemic:Current evidence and future perspectives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第13期9卷 2951-2968页

作者： Hung-Yuan su yin-Chou Hsu Department of Emergency Medicine E-DA HospitalI-Shou UniversityKaohsiung 82445Taiwan China School of Chinese Medicine for Post Baccalaureate I-Shou UniversityKaohsiung 82445Taiwan China

The outbreak of coronavirus disease-2019(COVID-19)has resulted in a global public health *** with cirrhosis were deemed more susceptible to viral infection because of their dysregulated immune *** to the general population,cirrhotic patients exhibit various degrees of COVID-19-related liver injury,which could be attributed to direct virus cytotoxicity,systemic immune system activation,drug-related liver injury,reactivation of pre-existing liver disease,and hypoxic *** clinical symptoms in patients with cirrhosis and COVID-19 were similar to those in the general population with COVID-19,with a lower proportion of patients with gastrointestinal *** respiratory failure is the predominant cause of mortality in cirrhotic patients with COVID-19,a significant proportion of them lack initial respiratory *** evidence has shown that cirrhotic patients have relatively higher rates of morbidity and mortality associated with *** cirrhosis was also proposed as an independent factor affecting a poor prognosis and the need to consider COVID-19 palliative *** measures implemented to prevent the transmission of the virus are also essential for cirrhotic patients,and they should also receive standard cirrhosis care with minimal *** efficacy of the available COVID-19 vaccines in cirrhotic patients still needs investigation.

关键词： COVID-19 SARS-CoV-2 Cirrhosis Acute liver injury Prognosis Therapy

Nearly Uniform Design Construction on Flexible Region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2020年第3期36卷 557-565页

作者： Jian-hui NING Wen-wen yin Li PENG School of Mathematics and Statistics Center China Normal UniversityWuhan 430079China School of statistics Renmin University of ChinaBeijing 100872China Department of Statistics General Administration of Customs of the People's Republic of ChinaBeijing 100730China

In this paper,we deduced an iteration formula for the computation of central composite *** using the iteration formula,the computational complexity of uniform design construction in flexible region can be greatly *** we also made a refinement to threshold accepting algorithm to accelerate the algorithm's convergence *** show that the refined algorithm can converge to the lower discrepancy design more stably.

关键词： uniform design flexible region central composite discrepancy threshold accepting algorithm

维普期刊数据库

Effect of Zr on undissolved phases and carbide precipitation in Ti microalloyed low-carbon steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第7期26卷 720-732页

作者： Peng-cheng Liu Jian-chun Cao Shu-biao yin yin-hui Yang Peng Gao Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China

The undissolved phases and carbide precipitation in Ti and Ti-Zr microalloyed low-carbon steels were investigated by scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectrometry. At 1225℃, the replacement of Ti by Zr formed Zr2CS and (Zr, Ti)N (the Ti/Zr atomic ratio is 0.11) and reduced the consumption of Ti. At 925℃, it was identified that TiC phases were precipitated at first and Zr was incorporated into the TiC lattice in the subsequent precipitation process, which promoted the precipitation of titanium carbide. The calculation of the interaction coefficient between Ti, C, N and Zr showed that Zr reduced the activity of Ti and C and increased the activity of N in the iron matrix. Therefore, with the addition of Zr, the solubility of Ti was increased, and the consumption of Ti was reduced at high temperature in Ti microalloyed low-carbon steel. The thermodynamic calculation of carbide precipitation transformation showed that the replacement of Ti by Zr increased the nucleation driving force and the nucleation rate of titanium carbide, while the critical core size and the critical nuclear energy were reduced. As the holding time was extended, the Zr/ Ti atomic ratio increased and the size of the precipitates also increased. When the Zr/Ti atomic ratio reached a certain level, the size of the precipitates did not increase with further increase in atomic ratio. When the Zr/Ti atomic ratio in (Ti, Zr)C was 0.05-0.17,(Ti, Zr)C was the most stable carbide and the easiest to nucleate at 925℃. There was more of the (Ti, Zr)C phase than TiC at 925 ℃ after 50 and 100 s, and the time to complete the coarsening behavior of (Ti, Zr)C was shorter than that of TiC.

关键词： Ti-Zr microalloyed steel Undissolved phase Carbide precipitation Zirconium Thermodynamics

Integrable Variable-coefficient Coupled Cylindrical NLS Equations and Their Explicit Solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2014年第4期30卷 1017-1024页

作者： Ting su Guo-hua DING Jian-yin FANG Department of Mathematical and Physical Science Henan Institute of Engineering

Based on the generalized dressing method, we propose integrable variable coefficient coupled cylin-drical nonlinear SchrSdinger equations and their Lax pairs. As applications, their explicit solutions and their reduct... 详细信息

关键词： variable-coefficient coupled NLS equations the generalized dressing method integrability

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

云南巍山县冬春牧草引种及混播组合试验

草业与畜牧 2011年第5期 22-25页

作者：徐驰薛世明黄必志苏会银杨金勇熊景发马红匡崇义云南省草地动物科学研究院云南昆明650212 云南省巍山县畜牧局云南巍山672400

在云南巍山县,对引进的18个冬春牧草品种及3个混播组合进行了两年的观测。结果表明:冬春优良的禾本科牧草品种有杰威多花黑麦草、钻石T多花黑麦草、特高多花黑麦草;优良的豆科牧草品种有盛世紫花苜蓿、三得利紫花苜蓿和牧歌401+Z紫花苜... 详细信息

在云南巍山县,对引进的18个冬春牧草品种及3个混播组合进行了两年的观测。结果表明:冬春优良的禾本科牧草品种有杰威多花黑麦草、钻石T多花黑麦草、特高多花黑麦草;优良的豆科牧草品种有盛世紫花苜蓿、三得利紫花苜蓿和牧歌401+Z紫花苜蓿,优良的混播组合为盛世紫花苜蓿+特高多花黑麦草。

关键词：云南巍山冬春牧草引种混播

维普期刊数据库

Neighborhood garden's age shapes phyllosphere microbiota associated with respiratory diseases in cold seasons

在线全文

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2024年第2期18卷 114-123页

作者： Chang Zhao Xinxin Liu Haoxin Tan Shan yin Lantian su Baoming Du Muhammad Khalid Aki Sinkkonen Nan hui School of Agriculture and Biology Shanghai Jiao Tong University800 Dongchuan Rd.200240ShanghaiChina Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station Ministry of Science and TechnologyMinistry of Education800 Dongchuan Rd.200240ShanghaiChina Shanghai Urban Forest Ecosystem Research Station National Forestry and Grassland Administration800 Dongchuan Rd.200240ShanghaiChina Department of Biology College of Science and TechnologyWenzhou-Kean UniversityWenzhouChina Department of Garden Technologies Horticulture TechnologiesNatural Resources Institute FinlandHelsinkiFinland Ecosystems and Environment Research Programme Faculty of Biological and Environmental SciencesUniversity of HelsinkiLahtiFinland

Neighborhood gardens serve as sensitive sites for human microbial encounters,with phyllosphere microbes directly impacting our respiratory ***,our understanding remains limited on how factors like season,garden age,and land use shape the risk of respiratory diseases(RDs)tied to these garden *** we examined the microbial communities within the phyllosphere of 72 neighborhood gardens across Shanghai,spanning different seasons(warm and cold),garden ages(old and young),and locales(urban and rural).We found a reduced microbial diversity during the cold season,except for Gammaproteobacteria which exhibited an inverse *** land use influenced the microbial composition,urban and rural gardens had strikingly similar microbial ***,young gardens in the cold season hosted a substantial proportion of RDs-associated species,pointing towards increased respiratory inflammation *** essence,while newer gardens during colder periods show a decline in microbial diversity,they have an increased presence of RDs-associated microbes,potentially escalating respiratory disease *** underscores the pivotal role the garden age plays in enhancing both urban microbial diversity and respiratory health.

关键词： Neighborhood gardens Phyllosphere microbial communities Seasonal variation Garden age Respiratory diseases

Anchor-based manifold binary pattern for finger vein recognition

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(Information Sciences) 2019年第5期62卷 129-144页

作者： Haiying LIU Gongping YANG Lu YANG Kun su Yilong yin School of Software Shandong University School of Computer Science and Technology Shandong University of Finance and Economics

This paper proposes a novel learning method of binary local features for recognition of the finger vein. The learning methods existing in local features for image recognition intend to maximize the data variance, reduce quantitative errors, exploit the contextual information within each binary code, or utilize the label information, which all ignore the local manifold structure of the original data. The manifold structure actually plays a very important role in binary code learning, but constructing a similarity matrix for large-scale datasets involves a lot of computational and storage cost. The study attempts to learn a map, which can preserve the manifold structure between the original data and the learned binary codes for large-scale situations. To achieve this goal, we present a learning method using an anchor-based manifold binary pattern(AMBP) for finger vein recognition. Specifically, we first extract the pixel difference vectors(PDVs) in the local patches by calculating the differences between each pixel and its neighbors. Second,we construct an asymmetric graph, on which each data point can be a linear combination of its K-nearest neighbor anchors, and the anchors are randomly selected from the training samples. Third, a feature map is learned to project these PDVs into low-dimensional binary codes in an unsupervised manner, where(i) the quantization loss between the original real-valued vectors and learned binary codes is minimized and(ii) the manifold structure of the training data is maintained in the binary space. Additionally, the study fuses the discriminative binary descriptor and AMBP methods at the image representation level to further boost the performance of the recognition system. Finally, experiments using the MLA and PolyU databases show the effectiveness of our proposed methods.

关键词： finger vein recognition feature learning local linear embedding fusion manifold learning anchor

Hierarchical Dragonfly Wing： Microstructure-Biomechanical Behavior Relations

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 Bionic Engineering 2012年第2期9卷 185-191页

作者： yinglong Chen Xishu Wang Huaihui Ren Hang yin su Jia Department of Engineering Mechanics AML School of Aerospace Tsinghua University Beijing 100084 P. R. China Beijing Aeronautical Engineering Technology Center Beijing 100076 P. R. China

The dragonfly wing, which consists of veins and membrane, is of biological hierarchical material. We observed the cross-sections of longitudinal veins and membrane using Environmental Scanning Electron Microscopy （ESEM）. Based on the experiments and previous studies, we described the longitudinal vein and the membrane in terms of two hierarchical levels of organization of composite materials at the micro- and nano-scales. The longitudinal vein of dragonfly wing has a complex sandwich structure with two chitinous shells and a protein layer, and it is considered as the first hierarchical level of the vein. Moreover, the chitinous shells are concentric multilayered structures. Clusters of nano-fibrils grow along the circumferential orientation embedded into the protein layer. It is considered as the second level of the hierarchy. Similarly, the upper and lower epidermises of membrane constitute the first hierarchical level of organization in micro scale. Similar to the vein shell, the membrane epidermises were found to be a paralleled multilayered structure, defined as the second hierarchical level of the membrane. Combining with the mechanical behavior analysis of the dragonfly wing, we concluded that the growth orientation of the hierarchical structure of the longitudinal vein and membrane is relevant to its biomechanical behavior.

关键词： dragonfly wing longitudinal vein membrane hierarchical structure biomechanical behavior