检索结果-南通市图书馆

Journal of Iron and Steel Research International 2015年第6期22卷 527-533页

作者： Shuai YANG Yun PENG xiao-mu ZHANG Zhi-ling TIAN China Railway Materials Technologies Company Limited State Key Laboratory of Advanced Steel Processes and Products Central Iron and Steel Research Institute

The influence of aging temperature on phase transformation and mechanical properties of weld metal of maraging steel （grade C300） was studied. Microstructure was analyzed by means of optical microscopy, transmission e leetron microscopy, scanning electron microscopy and energy dispersive spectrum analysis. Gibbs free energy of Nia Ti and Fez Mo at different temperature was calculated by Thermal-calc software. The microstructure of weld metal in as- welded state is martensite. The yield strength of weld metal after 430 ℃ aging process may increase to 1561 MPa from 890 MPa in as-welded state, which is ascribed to the formation of spinodal constitute and GP zones. After 480 ℃ aging process, there are great deal of NiaTi precipitates in the martensite matrix and 10% reverted austenite phase in the cellular grain boundary, and the yield strength increases to 1 801 MPa. After aging process at 580 ℃ , there are many Fe2 Mo precipitates in the martensite matrix and 30%o reverted austenite phase in the cellular grain boundary, and the yield strength is 1329 MPa, which ls the lowest among the three cases. The phase transformation may also influence the toughness. It is found that precipitates make the toughness decrease and reverted austenite increases it. The mechanism of phase transformation on strength and toughness is discussed.

关键词： maraging steell weld metal aging temperature precipitate reverted austenitel mechanical property

Tantalum （Oxy）Nitride： Narrow Bandgap Photocatalysts for Solar Hydrogen Generation

在线全文

学校读者我要写书评

暂无评论

Engineering 2017年第3期3卷 365-378页

作者： mu xiao Songcan Wang Supphasin Thaweesak Bin Luo Lianzhou Wang Nanomaterials Center School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane QLD 4072 Australia

Photocatalytic water splitting, which directly converts solar energy into hydrogen, is one of the most desirable solar-energy-conversion approaches. The ultimate target of photocatalysis is to explore efficient and stable photocatalysts for solar water splitting. Tantalum （oxy）nitride-based materials are a class of the most promising photocatalysts for solar water splitting because of their narrow bandgaps and sufficient band energy potentials for water splitting. Tantalum （oxy）nitride-based photocatalysts have experienced intensive exploration, and encouraging progress has been achieved over the past years. However, the solar- to-hydrogen （STH） conversion efficiency is still very far from its theoretical value. The question of how to better design these materials in order to further improve their water-splitting capability is of interest and importance. This review summarizes the development of tantalum （oxy）nitride-based photocatalysts for solar water spitting. Special interest is paid to important strategies for improving photocatalytic water- splitting efficiency. This paper also proposes future trends to explore in the research area of tantalum-based narrow bandgap photocatalysts for solar water splitting.

关键词： Tantalum-based photocatalyst Narrow bandgap Water splitting Hydrogen

Left ventricle energy loss in normo-and hypertensive subjects

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

Journal of Geriatric Cardiology 2020年第6期17卷 344-350页

作者： xiao-Wen ZUO Hua-Ping JIA xiao ZHOU Yang mu Guang ZHI Medical School of Chinese PLA BeijingChina Department of Ultrasound Medicine PLA Strategic Support Force Characteristic Medical CenterBeijingChina Department of Cardiology the First Medical Center of Chinese PLA General HospitalBeijingChina

Background Vector flow mapping is a novel echocardiographic technique that enables the visualization of the intraventricular flow. We aimed to evaluate and compare the index of hemodynamic dissipative energy loss in patients with hypertension and the ones with normotensive, unaffected control subjects. Methods & Results Transthoracic echocardiography was performed in eighty-nine hypertensive patients with preserved left ventricular ejection fraction, fifty-one hypertensive patients with left ventricular hypertrophy(LVH group) and thirty-eight hypertensive patients without LVH(non-LVH group). Forty-two healthy volunteers were enrolled as the control group. The stored images were analyzed to calculate the energy loss. The average energy loss of diastole in the LVH group was significantly increased(controls vs. non-LVH vs. LVH: 7.07 ± 0.91 vs. 12.44 ± 3.14 vs. 16.29 ± 3.17 J/s per m^3). Compared with the control group, the energy loss was significantly increased in the LVH group during the different periods in diastole. The energy loss in the non-LVH group was the greatest among the three groups during the atrial contraction period. Conclusions Energy loss provides a promising method for evaluating the energy efficiency in the left ventricle and may be a new indicator of left ventricular cardiac dysfunction.

关键词： Echocardiography Energy loss Hypertension Vector flow mapping

The impact of migration on the food consumption and nutrition of left-behind family members: Evidence from a minority mountainous region of southwestern China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第8期18卷 1780-1792页

作者： MIN Shi HOU Ling-ling Hermann Waibel HUANG Ji-kun mu yue-ying China Center for Agricultural Policy School of Advanced Agricultural Sciences Peking University Beijing 100871 P.R.China Institute of Development and Agricultural Economics Leibniz University Hannover Hannover 30167 Germany College of Economics and Management China Agricultural University Beijing 100083 P.R.China

While migration is widely recognized as a valid option for improving farmers’ income, the welfare effects of migration on left-behind family members are ambiguous. This study examines the impacts of migration on left-behind family members’ food consumption and nutrient intake, particularly in remote rural areas in China. Based on household survey data collected from 611 smallholder rubber farmers in Xishuangbanna Dai Autonomous Prefecture of southwestern China, the empirical results suggest that the migration of family members contributes to improving household net income, whereas it negatively affects left-behind family members’ consumption of grain and pork. Migration also leads to a decrease in left-behind family members’ nutrient intake. Surprisingly, the economic returns of farmers’ migration not only do not foster the transformation of household food consumption from a staple food-dominated dietary structure to one including more meat and dairy products but also reduce left-behind family members’ nutrient intake. This study adds to the literature on the impact of farmers’ migration. The findings have important implications for better understanding the impacts of migration on farmers’ livelihood and human capital development in rural China.

关键词： migration food consumption nutrition left-behind

甘蓝型油菜腺苷5'-磷酰硫酸还原酶(APR)基因家族的鉴定及其非生物胁迫下的响应

在线全文

学校读者我要写书评

暂无评论

农业生物技术学报 2025年第1期33卷 15-29页

作者：张小雪冀功海穆雨姜伟高刘清云王新发顿小玲任丽军中国农业科学院油料作物研究所/农业农村部油料作物生物学与遗传育种重点实验室浠水县农业技术推广中心

腺苷5'-磷酰硫酸还原酶(adenosine 5'-phosphosulfate reductase, APR)是植物硫酸盐同化途径中的关键酶，对硫酸盐代谢和硫循环至关重要。该蛋白包含2个保守结构域：PAPS＿reductase和Thioredoxin，主要在质体中执行催化功能，对植物的... 详细信息

腺苷5'-磷酰硫酸还原酶(adenosine 5'-phosphosulfate reductase, APR)是植物硫酸盐同化途径中的关键酶，对硫酸盐代谢和硫循环至关重要。该蛋白包含2个保守结构域：PAPS＿reductase和Thioredoxin，主要在质体中执行催化功能，对植物的生长发育和逆境应答有重要影响。为系统研究甘蓝型油菜(Brassica napus)中APR家族基因的结构与功能特征，本研究以拟南芥APR蛋白序列为模板，对甘蓝型油菜'中双11号'全基因组进行同源比对，共鉴定到10个APR家族基因，分布于9条染色体。进一步对该基因家族进行鉴定和分析，并初步探讨了甘蓝型油菜APR基因在非生物胁迫下的表达模式。结果显示，甘蓝型油菜APR蛋白的氨基酸序列长度为219～468 aa，相对分子质量范围为24.29～51.69 kD，等电点跨度为5.43～8.84；系统发育分析显示，甘蓝型油菜APR基因被分为3个亚族，各亚族成员具有相似的外显子-内含子结构；且APR蛋白均含有PAPS＿reductase和Thioredoxin保守结构域；共线性分析表明，片段复制是甘蓝型油菜APR基因家族扩张的主要机制；表达模式分析显示，APR基因在不同发育时期的组织器官中具有时空表达特异性，在油菜的子叶、营养莲座叶和角果皮中表达量较高；对甘蓝型油菜APR家族的启动子顺式作用元件和非生物胁迫条件下的表达模式进行分析，结果表明，甘蓝型油菜APR家族成员启动子区域富集了与激素响应和逆境适应相关的顺式作用元件，且该家族基因表达受重金属镉、铅和缺硫胁迫所诱导。上述结果表明，甘蓝型油菜APR基因在响应重金属镉、铅胁迫中发挥着重要的作用，这为进一步深入解析甘蓝型油菜APR家族基因的分子功能提供了参考。

关键词：甘蓝型油菜 APR基因家族非生物胁迫基因表达

A New Mathematical Model for Description of the Liquid Discrete Flow Within a Packed Bed

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 Iron and Steel Research International 2008年第6期15卷 16-23页

作者： WANG Cheng-shan mu xiao-jing ZHENG Shao-bo JIANG Guo-chang xiao Xing-guo College of Materials Science and Engineering Chongqing University Chongqing 400044 China College of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China State Enhance Laboratory of Ferro Metallurgy Shanghai University Shanghai 200072 China School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

The molten liquid discrete flow inside a packed bed is a typical transport phenomenon in the blast furnace. As for the reported mathematical models presenting the liquid discrete flow within the packed bed, there are some barriers for their application to an engineering scale-up, or some imperfections in model descriptions. To overcome these deficiencies, the effects of the packed bed on the liquid discrete flow have been divided into resistance action and dispersal action, and appropriate descriptions have been given for the two aetions, respectively. Consequently, a new mathematical model has been built to present the liquid discrete flow inside a coke bed in the blast furnace. The mathematical model can predict the distribution of liquid flux and the liquid flowing range inside the packed bed at any time. The prediction of this model accords well with the experimental data. The model will be much better for the simulation of the ironmaking process, compared with the existent model.

关键词： mathematical model liquid discrete flow packed bed blast furnace ironmaking process

Analyzing Nitrogen Effects on Rice Panicle Development by Panicle Detection and Time-Series Tracking

在线全文

学校读者我要写书评

暂无评论

Plant Phenomics 2023年第2期5卷 253-267页

作者： Qinyang Zhou Wei Guo Na Chen Ze Wang Ganghua Li Yanfeng Ding Seishi Ninomiya yue mu College of Agriculture Academy for Advanced Interdisciplinary StudiesCollaborative Innovation Center for Modern Crop Production co-sponsored by Province and MinistryNanjing Agricultural UniversityNanjing 210095China Graduate School of Agricultural and Life Sciences The University of Tokyo1-1-1 Midori-choNishi-TokyoTokyo 188-0002Japan

Detailed observation of the phenotypic changes in rice panicle substantially helps us to understand the yield *** recent studies,phenotyping of rice panicles during the heading–flowering stage still lacks comprehensive analysis,especially of panicle development under different nitrogen *** this work,we proposed a pipeline to automatically acquire the detailed panicle traits based on time-series images by using the YOLO v5,ResNet50,and DeepSORT *** with field observation data,the proposed method was used to test whether it has an ability to identify subtle differences in panicle developments under different nitrogen *** result shows that panicle counting throughout the heading–flowering stage achieved high accuracy(R^(2)=0.96 and RMSE=1.73),and heading date was estimated with an absolute error of 0.25 *** addition,by identical panicle tracking based on the time-series images,we analyzed detailed flowering phenotypic changes of a single panicle,such as flowering duration and individual panicle flowering *** rice population,with an increase in the nitrogen application:panicle number increased,heading date changed little,but the duration was slightly extended;cumulative flowering panicle number increased,rice flowering initiation date arrived earlier while the ending date was later;thus,the flowering duration became *** a single panicle,identical panicle tracking revealed that higher nitrogen application led to earlier flowering initiation date,significantly longer flowering days,and significantly longer total duration from vigorous flowering beginning to the end(total DBE).However,the vigorous flowering beginning time showed no significant differences and there was a slight decrease in daily DBE.

关键词： heading identical flowering

Familial left cervical neurofibromatosis 1 with scoliosis:A case report

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

World Journal of Clinical Cases 2021年第29期9卷 8839-8845页

作者： Xia mu Han-Yu Zhang yue-Hong Shen Hong-Yu Yang School of Stomatology Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Department of Stomatology Peking University Shenzhen HospitalShenzhen 518036Guangdong ProvinceChina Department of Oral and Maxillofacial Surgery Peking University Shenzhen HospitalShenzhen 518036Guangdong ProvinceChina

BACKGROUND Neurofibromatosis type 1(NF1)is an inherited autosomal dominant disorder affecting many parts of the body with caféau lait spots,skeletal deformity,and scoliosis.A familial case of NF1 with scoliosis and a painless mass had not yet been *** SUMMARY We describe the case of a 15-year-old male patient with a painless lump on the left side of his neck for 10 years and *** right shoulder was about 5 cm lower than the left,the left side of his face was deformed,and the left submandibular skin was *** folding and drooping were obvious and movement was *** tomography revealed the involvement of the neck,upper chest wall,and surrounding left shoulder,accompanied by bone changes and *** evaluation showed subepidermal pale blue mucoid degeneration,fibrous fusiform cells in the dermis in a fascicular,woven *** mother had the same medical *** diagnosis was neurofibromatosis of the left *** parts of the tumor tissue were serially resected during several *** months after surgery,there was a slight tendency to *** This case of slow-progressing NF1 highlights the importance of early diagnosis and treatment to reduce its impact on the patient’s growth and development.

关键词： Neurofibromatosis type 1 Scoliosis Neck mass Arteriography Embolization Case report

Facile one-step synthesis of PdPb nanochains for high-performance electrocatalytic ethanol oxidation

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

Rare Metals 2020年第7期39卷 792-799页

作者： Yong Zhang xiao-Lei Yuan Feng-Lei Lyu Xu-Chun Wang xiao-Jing Jiang mu-Han Cao Qiao Zhang Institute of Functional Nano and Soft Materials FUNSOM Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China School of Chemistry and Chemical Engineering Nantong UniversityNantong 226019China

The widespread application of direct ethanol fuel cells is hampered due to the low activity,high cost and poor operation durability of electrocatalysts for ethanol oxidation reaction(EOR).Herein,we report a one-pot synthetic method to synthesize PdPb3 nanochains with well-defined shape,size and composition via a solution-phase reduction *** morphology,composition distribution and structure characteristics of PdPb3 nanochains were investigated by transmission electron microscopy,X-ray photoelectron spectroscopy and X-ray *** to the unique structure,the as-obtained PdPb3 nanochains can manifest much higher mass activity(2523 mA·mg-1)and higher operation durability than commercial Pd/C(1272 mA·mg-1)during the EOR *** importantly,further CO-stripping measurements indicate that the incorporation of Pb species could favor the oxidative removal of CO intermediates on the Pd electrode at the negative potential and enhance the EOR activity and stability,making it possible to develop highly active and durable electrocatalysts.

关键词： PdPb Nanochains Ethanol oxidation reaction CO stripping Electrocatalysts

Synthesis and thermal properties of poly(styrene-co-acrylonitrile)-graft-polyethylene glycol copolymers as novel solid–solid phase change materials for thermal energy storage

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第11期26卷 1364-1366页

作者： Si-Yang mu Jing Guo Yu-Mei Gong Sen Zhang yue Yu School of Textile and Material Engineering Dalian Polytechnic University Liaoning Engineering Technology Research Centre of Function Fiber and Its Composites

A novel poly（styrene-co-acrylonitrile）-graft-polyethylene glycol （SAN-g-PEG） copolymer was synthesized as new solid-solid phase change materials （SSPCMs） by grafting PEG to the main chain of poly（styrene-co-acrylonitrile）. The chemical structure of the SAN-g-PEG was confirmed by the Fourier transform infrared （FT-IR） and proton nuclear magnetic resonance （1H NMR） spectroscopy techniques. The thermal energy storage properties and the storage durability of the SAN-g-PEG were investigated by differential scanning calorimetry （DSC）. The SAN-g-PEG was endowed with the solid- solid phase transition temperatures within the range of 23-36 ℃ and the latent heat enthalpy ranged from 66.8 kJ/kg to 68.3 kJ/kg. Thermal cycling tests revealed that the SAN-g-PEG kept great heat storage durability after 1000 thermal cycles. The thermal stability was evaluated by a thermal gravity analysis （TGA）, and the initial decomposition temperature （Td） of SAN-g-PEG is 350 ℃, which proves that the SAN-g-PEG possessed good thermal stabilitv.

关键词： Phase change materialEnergy storage and conversionThermal propertiesPolyethylene glycol