检索结果-南通市图书馆

MICROSTRUCTURAl EVOlUTION OF AS-CAST ZA27 AllOY DURING COMPRESSIVE CREEP

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2003年第5期16卷 335-341页

作者： X.W.Wei B.l.shen DepartmentofMaterialsScienceandEngineering SichuanInstituteofTechnologyChengdu610039China DepartmentofMetalScience SichuanUniversityChengdu610065China

Phase transformation and micro structural change of an as-cast ZA27 alloy were investigated during compressive creep by X-ray diffraction technique, SEM and TEM. Compressive creep induced decomposition of α metastable η' phase and a four-phase transformation, α + ε → T' + η and T' → θ, occurred during the compressive creep testing. The occurrence of negative creep in the alloy resulted from the volume expansion caused by the four-phase transformation. A micro structural change was also observed from a lamellar structure into a spheroidized structure in higher creep strain of tested specimens. It provided evidence of compressive creep induced phase transformation which occurred in ageing process.

关键词： microstructure change compressive creep ZA27 alloy

秸秆还田、覆膜和施氮对旱地麦田土壤质量的影响

在线全文

学校读者我要写书评

暂无评论

环境科学 2024年第4期45卷 2292-2303页

作者：叶子壮王松燕陆潇史多鹏吕慎强李嘉杨泽宇王林权西北农林科技大学资源环境学院杨凌712100

通过5 a大田定位试验研究了秸秆还田、覆膜及氮肥对旱地土壤质量的影响.以双因素裂区设计,主处理为3种栽培模式:常规栽培(CT)、秸秆还田(SR)和覆膜栽培(FM);副处理为3种施氮水平:0、144和180 kg·hm^(-2).在第5季冬小麦收获后采集耕层0~... 详细信息

通过5 a大田定位试验研究了秸秆还田、覆膜及氮肥对旱地土壤质量的影响.以双因素裂区设计,主处理为3种栽培模式:常规栽培(CT)、秸秆还田(SR)和覆膜栽培(FM);副处理为3种施氮水平:0、144和180 kg·hm^(-2).在第5季冬小麦收获后采集耕层0~20 cm土壤样品,测定容重(BD)、孔隙度(SP)、田间持水量(FC)、有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)、矿质氮(NO_(3)^(-)-N+NH_(4)^(+)-N)、速效磷(AP)、速效钾(AK)、微生物生物量碳(MBC)、微生物生物量氮(MBN)、蔗糖酶(SA)、碱性磷酸酶(AlP)、脲酶(UA)和脱氢酶(DHA)等土壤理化性质及生物性质等指标,基于两个最小数据集(MDS),利用线性(lT)和非线性(NlT)评分模型计算土壤质量指数(SQI),通过与冬小麦产量拟合来寻找最优SQI,据此分析土壤质量对秸秆还田、覆膜及氮肥的响应.结果表明,SR处理的SP、FC、SOC、TK、SA、AlP、DHA、MBN和MBC分别较CT显著高10.1%、40.5%、28.3%、14.3%、22.0%、8.9%、48.3%、35.9%和62.5%.FM处理的SP、FC、NO_(3)^(-)-N、AP、AK、AlP和MBN分别较CT显著高3.1%、14.6%、729.0%、37.4%、28.2%、7.2%和17.7%.SR和FM处理冬小麦产量分别较CT显著高25.1%和18.6%.与N_(0)相比,施用氮肥土壤SP、TN、NO_(3)^(-)-N、NH_(4)^(+)-N、AlP和MBN显著增加3.4%~407.6%,BD、SOC和MBC/MBN显著下降3.0%~31.7%.在3种栽培模式下,施氮显著增加冬小麦产量,增幅为69.4%~79.1%,相同栽培模式两施氮水平间差异不显著.基于MDS2的非线性评分模型计算的SQI能够更准确地评价旱地麦田土壤质量.在NlT-SQI2中,SR、FM和氮肥均可增加土壤的SQI,在SR配施N_(180)水平下SQI达到最大,FM次之,CT最小.综上,秸秆还田和覆膜配施适量氮肥能维持和提高土壤质量,秸秆还田优于覆膜.

关键词：秸秆还田覆膜氮肥主成分分析(PCA) 最小数据集(MDS) 土壤质量指数(SQI)

Multimedia Encryption with Multiple Modes Product Cipher for Mobile Devices

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2018年第2期16卷 184-190页

作者： Yi-Nan lin Gwo-Jen Chiou Victor R.l.shen the Department of Electronic Engineering Ming Chi University of Technology the Department of Electrical Engineering Formosa University the Department of Computer Science and Information Engineering Taipei University the Department of Information Management Chaoyang University of Technology

The most straight forward method in multimedia encryption is to encrypt the entire stream using standard encryption methods,such as the data encryption standard(DES) or advanced encryption standard(AES).However,in the block ciphering,there exists an attack risk with the weakness of plaintextciphertext pairs(*** plaintext-ciphertext pair problem).Therefore,several modes of operation are proposed to solve the above *** we all know,channel hopping can defend illegal ***,this paper has proposed a multimedia encryption scheme with the multiple modes product cipher(MMPC) for mobile *** practice,MMPC can increase the security level in wireless multimedia *** results of Android applications(Apps) system have shown that the overhead of MMPC is decreased by 2%in throughputs,if it is compared with that of the other straightforward mode ciphers.

关键词： Advanced encryption standard(AES) encryption blockwise confidentiality dynamical operation model multi-mode cipher

番木瓜畸形花叶病毒HC-Pro蛋白的原核表达与纯化

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

分子植物育种 2024年第10期22卷 3166-3171页

作者：苏蝶庹德财周鹏言普黎小瑛朱国鹏沈文涛海南大学园艺学院海口570228 中国热带农业科学院热带生物技术研究所海口571101

番木瓜畸形花叶病毒(papaya leaf distortion mosaic virus, PlDMV, Potyvirus属)是目前威胁中国番木瓜种植的主要病原之一。辅助成分-蛋白酶(helper component-proteinase, HC-Pro)是PlDMV编码参与病毒运动、复制、媒介传播、基因沉默... 详细信息

番木瓜畸形花叶病毒(papaya leaf distortion mosaic virus, PlDMV, Potyvirus属)是目前威胁中国番木瓜种植的主要病原之一。辅助成分-蛋白酶(helper component-proteinase, HC-Pro)是PlDMV编码参与病毒运动、复制、媒介传播、基因沉默抑制的多功能蛋白。为了获得HC-Pro基因的纯化蛋白,本研究通过密码子优化HC-Pro基因序列,成功构建原核表达质粒p ET-30a-HCPro,经IPTG诱导后实现HC-Pro在大肠杆菌中的原核表达,在0.5 mmol/l IPTG,20℃条件下诱导过夜时其表达量最高;破碎菌体后,SDS分析全菌、破碎上清以及沉淀中目标蛋白的表达量,结果显示重组HC-Pro蛋白主要以不可溶的包涵体形式在沉淀中表达;进一步溶解包涵体通过Ni-NTA层析柱进行纯化,在500 mmol/l浓度咪唑下可以获得分子量大小约为54 kD的HC-Pro重组蛋白;Western Blot分析纯化后的目标蛋白,结果显示54 kD处有明显的条带,与预期的HC-Pro重组蛋白大小一致。本研究成功表达并纯化获得了PlDMV重组蛋白HC-Pro,为后续抗体制备和探究其功能提供了理论基础。

关键词：番木瓜畸形花叶病毒 HC-Pro 原核表达纯化

Syntheses and characterization of the noble-metal substituted heptadecatungstodiarsenates

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1997年第3期15卷 234-241页

作者： Jin, Sl liu, HZ shen, l li, P Qiu, DR Xie, GY FUDAN UNIV RES CTR ANAL & MEASUREMENT SHANGHAI 200433 PEOPLES R CHINA

Four Dawson type heteropolyoxotungstates substituted by noble metals with the general formula (TBA)(n)[As2W17M(OH2)O-61], where M=Pd-II, Ru-III, Ir-IV and Pt-IV are prepared by filling thp meant site of thp lacunary percursor alpha(2)-K10As2W17O61. UV-vis and IR spectra are similar to the other transition metal substituted Dawson type tungstodiarsenates. EPR result provides direct evidence to identify the presence of noble metal cation. Electrochemical behavior investigated bg cyclic voltammetry irt acetonitrile displays four reversible one-electron redox couples attributed to the W(VI-->V) process of tungsten-oxo framework.

关键词： noble metal heptadecatungstodiarsenate

Interactions between central nervous system and peripheral metabolic organs

在线全文

学校读者我要写书评

暂无评论

Science China(life Sciences) 2022年第10期65卷 1929-1958页

作者： Wenwen Zeng Fan Yang Wei l.shen Cheng Zhan Peng Zheng Ji Hu Institute for Immunology and Department of Basic Medical SciencesSchool of MedicineTsinghua UniversityBeijing 100084China Tsinghua-Peking Center for life Sciences Beijing 100084China Beijing Key laboratory for Immunological Research on Chronic Diseases Beijing 100084China The Brain Cognition and Brain Disease Institute Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen 518055China School of life Science and Technology ShanghaiTech UniversityShanghai 201210China Department of Hematology The First Affiliated Hospital of USTCHefei National Laboratory for Physical Sciences at the MicroscaleSchool of Life SciencesDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230026China National Institute of Biological Sciences Beijing 102206China Tsinghua Institute of Multidisciplinary Biomedical Research Tsinghua UniversityBeijing 100084China Department of Neurology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400042China Institute of Neuroscience and the Collaborative Innovation Center for Brain Science Chongqing Medical UniversityChongqing 400016China Chongqing Key laboratory of Neurobiology Chongqing 400016China

According to Descartes,minds and bodies are distinct kinds of “substance”,and they cannot have causal ***,in neuroscience,the two-way interaction between the brain and peripheral organs is an emerging field of *** lines of evidence highlight the importance of such *** example,the peripheral metabolic systems are overwhelmingly regulated by the mind(brain),and anxiety and depression greatly affect the functioning of these ***,psychological stress can cause a variety of physical symptoms,such as bone ***,the gut microbiota appears to play a key role in neuropsychiatric and neurodegenerative ***,as the command center of the body,the brain can regulate our internal organs and glands through the autonomic nervous system and neuroendocrine system,although it is generally considered to be outside the realm of voluntary *** autonomic nervous system itself can be further subdivided into the sympathetic and parasympathetic *** sympathetic division functions a bit like the accelerator pedal on a car,and the parasympathetic division functions as the *** high center of the autonomic nervous system and the neuroendocrine system is the hypothalamus,which contains several subnuclei that control several basic physiological functions,such as the digestion of food and regulation of body ***,numerous peripheral signals contribute to the regulation of brain ***(GI) hormones,insulin,and leptin are transported into the brain,where they regulate innate behaviors such as feeding,and they are also involved in emotional and cognitive *** brain can recognize peripheral inflammatory cytokines and induce a transient syndrome called sick behavior(SB),characterized by fatigue,reduced physical and social activity,and cognitive *** summary,knowledge of the biological basis of the interactions between the central nervous system and peripheral

关键词： central nervous system peripheral organs adipose tissues bone metabolism gut microbiota

Reversible Data Hiding Based on Greedy Pairing Prediction-Error Expansion

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2022年第3期20卷 294-304页

作者： Yi-Nan lin Gwo-Jen Chiou Cheng-Ying Yang Victor R.l.shen Chiao-Chih lai the Department of Electronic Engineering Ming Chi University of TechnologyNew Taipei 243303 the Department of Electrical Engineering “National Formosa University”Yunlin 632301 the Department of Computer Science University of TaipeiTaipei 10048 the Department of Computer Science and Information Engineering “National Taipei University”New Taipei 23741 the Department of Information Management Chaoyang University of TechnologyTaichung 413310 Acer Company Taipei 221

Reversible data hiding(RDH)is a method to embed messages into an image that human eyes are difficult to recognize the differences between the original image and the embedded *** method needs to make sure that the original image and the embedded information can be exactly *** prediction-error expansion(PEE)is a successful way to realize ***,it is fixed when pairing the conventional twodimensional prediction-error histogram(2D-PEH).So,the embedding capacity(EC)and embedding distortion(ED)are not *** this study,we propose a method called greedy pairing prediction-error expansion(GPPEE)based on pairwise RDH and demonstrate GPPEE can achieve a more efficient embedding goal and reduce ED.

关键词： Greedy pairing prediction-error expansion(GPPEE) prediction-error expansion(PEE) reversible data hiding(RDH) two-dimensional prediction-error histogram(2D-PEH)

Neurocircuitry of Predatory Hunting

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2023年第5期39卷 817-831页

作者： Zheng-Dong Zhao li Zhang Xinkuan Xiang Daesoo Kim Haohong li Peng Cao Wei l.shen School of life Science and Technology ShanghaiTech UniversityShanghai 201210China Boston Children's Hospital Harvard Medical SchoolBostonMA 02115USA National Institute of Biological Sciences(NIBS) Beijing 102206China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China MoE Key laboratory for Biomedical Photonics Collaborative Innovation Center for Biomedical EngineeringSchool of Engineering SciencesHuazhong University of Science and TechnoiogyWuhan 430074China Department of Cognitive Brain Science Korea Advanced Institute of Science&TechnologyDaejeon 34141South Korea MOE Frontier Research Center of Brain&Brain-machine Integration School of Brain Science and Brain MedicineZhejiang UniversityHangzhou 310058China Affiliated Mental Health Centre and Hangzhou Seventh People's Hospital Zhejiang University School of MedicineHangzhou 310013China

Predatory hunting is an important type of innate behavior evolutionarily conserved across the animal *** is typically composed of a set of sequential actions,including prey search,pursuit,attack,and *** behavior is subject to control by the nervous *** studies used toads as a model to probe the neuroethology of hunting,which led to the proposal of a sensory-triggered release mechanism for hunting *** recent stud-ies have used genetically-trackable zebrafish and rodents and have made breakthrough discoveries in the neuroethol-ogy and neurocircuits underlying this ***,we review the sophisticated neurocircuitry involved in hunting and summarize the detailed mechanism for the circuitry to encode various aspects of hunting neuroethology,including sensory processing,sensorimotor transformation,motivation,and sequential encoding of hunting *** also discuss the overlapping brain circuits for hunting and feeding and point out the limitations of current *** propose that hunting is an ideal behavioral paradigm in which to study the neuroethology of motivated behaviors,which may shed new light on epidemic disorders,including bingeeating,obesity,and obsessive-compulsive disorders.

关键词： Predatory hunting Neurocircuits Sensory processing Sensorimotor transformation Appetitive motivation Sequential encoding

Analysis of influence of observation operator on sequential data assimilation through soil temperature simulation with common land model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Water Science and Engineering 2018年第3期11卷 196-204页

作者： Xiao-lei Fu Zhong-bo Yu Yong-jian Ding Ying Tang Hai-shen lü Xiao-lei Jiang Qin Ju College of Civil Engineering Fuzhou UniversityFuzhou 350116China State Key laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China State Key laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Department of Geography Environmentand Spatial SciencesMichigan State UniversityEast LansingMI 48824USA

An observation operator is a bridge linking the system state vector and observations in a data assimilation system. Despite its importance, the degree to which an observation operator influences the performance of data assimilation methods is still poorly understood. This study aimed to analyze the influences of linear and nonlinear observation operators on the sequential data assimilation through soil temperature simulation using the unscented particle filter(UPF) and the common land model. The linear observation operator between unprocessed simulations and observations was first established. To improve the correlation between simulations and observations, both were processed based on a series of equations. This processing essentially resulted in a nonlinear observation operator. The linear and nonlinear observation operators were then used along with the UPF in three assimilation experiments: an hourly in situ soil surface temperature assimilation, a daily in situ soil surface temperature assimilation, and a moderate resolution imaging spectroradiometer(MODIS) land surface temperature(lST) assimilation. The results show that the filter improved the soil temperature simulation significantly with the linear and nonlinear observation operators. The nonlinear observation operator improved the UPF's performance more significantly for the hourly and daily in situ observation assimilations than the linear observation operator did, while the situation was opposite for the MODIS lST assimilation. Because of the high assimilation frequency and data quality, the simulation accuracy was significantly improved in all soil layers for hourly in situ soil surface temperature assimilation, while the significant improvements of the simulation accuracy were limited to the lower soil layers for the assimilation experiments with low assimilation frequency or low data quality.

关键词： Observation operator Unscented particle filter(UPF) Soil temperature MODIS lST Data assimilation