检索结果-南通市图书馆

China Foundry 2020年第5期17卷 378-383页

作者： shu-lin Dong Xin Ding Rui-run Chen Jing-jie Guo Heng-zhi Fu Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

In order to improve the high-temperature deformation resistance and creep resistance of TiAl-based alloys,cold crucible directional solidification(CCDS)technology was employed.Aβ-type TiAl-based alloy with the nominal composition of Ti44Al6Nb1Cr2V was prepared using the optimized CCDS parameters of 45 kW input power and 0.5 mm·min^-1 solidification ***-compression testing was utilized to evaluate the hightemperature deformation resistance and creep resistance of the CCDS Ti44Al6Nb1Cr2V *** show that the CCDS Ti44Al6Nb1Cr2V alloy billets contain aligned columnar grains and a high percentage of small-angle ***-compression testing results in the radial direction of the CCDS alloy show a much higher peak stress than other reported results in similar *** much higher hardening exponent and deformation activation energy are obtained,corresponding to the excellent high-temperature deformation resistance and creep resistance,which are because of the hard-oriented grains,weaker stress-strain coordination capability of lamella structure and relatively more hysteretic dynamic ***-compression testing results in the longitudinal direction of the CCDS Ti44Al6Nb1Cr2V alloy show the much higher peak stress than that in the radial direction,indicating the better high-temperature deformation resistance and creep resistance attributed to the hard-oriented lamellae in this condition.

关键词： cold crucible directional solidification TiAl thermo-compression constitutive equations microstructure

In-situ synthesis of quantum dots in the nucleus of live cells

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第3期11卷 172-182页

作者： Yusi Hu Zhi-Gang Wang Haohao Fu Chuanzheng Zhou Wensheng Cai Xueguang Shao shu-lin Liu Dai-Wen Pang State Key Laboratory of Medicinal Chemical Biology Frontiers Science Centre for New Organic MatterTianjin Key Laboratory of Biosensing and Molecular Recognition Research Centre for Analytical Sciences College of Chemistry School of Medicine and Frontiers Science Centre for Cell Responses Nankai University Haihe Laboratory of Sustainable Chemical Transformations

The cell nucleus is the main site for the storage and replication of genetic material, and the synthesis of substances in the nucleus is rhythmic, regular and strictly regulated by physiological processes. However,whether exogenous substances, such as nanoparticles, can be synthesized in situ in the nucleus of live cells has not been reported. Here, we have achieved in-situ synthesis of CdSxSe1-xquantum dots（QDs） in the nucleus by regulation of the glutathione（GSH） metabolic pathway. High enrichment of GSH in the nucleus can be accomplished by the addition of GSH with the help of the Bcl-2 protein. Then, high-valence Se is reduced to low-valence Se by glutathione-reductase-catalyzed GSH, and interacts with the Cd precursor formed through Cd and thiol-rich proteins, eventually generating QDs in the nucleus. Our work contributes to a new understanding of the syntheses of substances in the cell nucleus and will pave the way for the development of advanced ‘supercells’.

关键词： glutathione live cell nucleus quantum dot intracellular synthesis

THERMAL AND MECHANICAL PROPERTIES OF POLYLACTIDE TOUGHENED WITH A BUTYL ACRYLATE-ETHYL ACRYLATE-GLYCIDYL METHACRYLATE COPOLYMER

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2013年第11期31卷 1519-1527页

作者： Yan-ping Hao Huan-huan Ge Li-jing Han 张会良 Li-song Dong shu-lin Sun Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied Chemistry Changchun University of Technology

In this work, a specific polylactide （PLA） 4032D was melt-mixed with a new toughener： butyl acrylate （BA）, ethyl acrylate （EA） and glycidyl methacrylate （GMA） copolymer （BA-EA-GMA）. DMA tests showed that PLA/BA-EA-GMA blends were partially miscible. The degree of crystallinity of PLA increased while the cold crystallization temperature shifted to higher temperatures with increasing BA-EA-GMA content. The SEM micrographs showed that PLA/BA-EA-GMA blends had a good dispersion and this phenomenon was in good agreement with their higher impact strength. The result showed that the adding of BA-EA-GMA has enhanced the flexibility of PLA/BA-EA-GMA blends as compared with pure PLA. The impact strength was changed from 3.4 kJ/m2 for pure PLA to 29.6 kJ/m2 for 80/20 PLA/BA-EA-GMA blend.

关键词： Polylactide Thermal properties Mechanical properties.

Contrasting strategies of optimizing carrier concentration in bulk InSe for enhanced thermoelectric performance

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4425-4432页

作者： Hao-Nan Shi shu-lin Bai Yu-Ping Wang Li-Zhong Su Qian Cao Cheng Chang Li-Dong Zhao School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Huabei Cooling Device Co.Ltd. Hebei 065400China

Indium selenide(InSe),as a wide-bandgap semiconductor,has received extensive attention in the flexible electronics field in recent years due to its exceptional plasticity and promising thermoelectric ***,the low carrier concentration severely limits its thermoelectric performance *** this work,we conducted contrasting strategies that can be employed to increase the carrier concentration of InSe,including bandgap narrowing and heterovalent ***,the carrier concentration initially increases as a result of the reduced bandgap upon Te alloying and then slightly decreases due to the weak electronegativity of *** Br doping realizes high carrier concentration by pushing the Fermi level into the conduction bands and activating the multiple *** the other hand,both Te and Br obviously suppress the thermal conductivity due to the point defect *** contrast,Br doping realizes a higher thermoelectric performance with a maximum ZT of~0.13 at 773 K benefiting from the better optimization of carrier *** work elucidates the strategies for enhancing carrier concentration at anion sites and demonstrates the high efficiency of halogen doping in ***,the carrier concentration of InSe is promising to be further optimized,and future work should focus on employing approaches such as cation doping or secondphase compositing.

关键词： Thermoelectric InSe Carrier concentration Bandgap Heterovalent doping

Negative Poisson's ratio and peripheral strain of an NPR anchor cable

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2022年第8期19卷 2435-2448页

作者： TAO Zhi-gang XU Hao-tian REN shu-lin GUO Long-ji QIN Ke ZHU Yi-fei State Key Laboratory for Geomechanics&Deep Underground Engineering Beijing 100083China School of Mechanics and Civil Engineering China University of Mining&TechnologyBeijing 100083China

Materials with a negative Poisson’s ratio effect perform significantly better than traditional materials for rock mass impact resistance,shear resistance,and energy *** on these advantages,a negative Poisson’s ratio anchor cable(NPR anchor cable)with high elongation and constant resistance was developed and successfully applied in the field of mine disaster ***,theoretical and experimental research on the negative Poisson’s ratio effect and peripheral strain characteristics of NPR anchor cables is currently *** study used several theories and methods,such as static tensile,peripheral strain measurement,and static negative Poisson’s ratio measurement,to investigate the radial deformation law of an NPR anchor cable and the negative Poisson’s ratio *** results elucidated constant resistance changes in an NPR anchor cable during operation,the motion of the constant resistance body in the constant resistance sleeve,and the deformation law of the constant resistance *** Poisson’s ratio characteristics of the NPR anchor cable and its superior energy absorption characteristics were verified and it provided a theoretical and experimental basis for energy absorption mechanisms of an NPR anchor cable.

关键词： NPR anchor cable Static tensile test Negative Poisson’s ratio Energy absorption

Distribution of Rice Grains on Panicle Axis and Its Relationship with Seed-Setting Ability in Liaoning, China

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

Agricultural Sciences in China 2006年第3期5卷 202-208页

作者： XU Zheng-jin CHEN Wen-fu shuN Zhan-hui ZHANG shu-lin LIU Li-xia ZHOU shu-qing Key Laboratory of Crop Physiology Ecology Genetics and Breeding Ministry of Agriculture/Key Laboratory of Northern Japonica Rice Breeding of Liaoning Province/Rice Institute Shenyang Agricultural University Shenyang 110161 P.R.China

Studies were conducted with rice varieties developed in recent years in Liaoning Province of China as test materials. Results showed that the varieties tested could be divided into three types：（1） the high-yielding （HYV）, （2） the mediumyielding （MYV）, and （3） the low-yielding （LYV）. The panicle population was in the order of HYV〈 MYV 〈 LYV, while the grain number per panicle and seed-setting rate were just opposite. There was no significant difference in the 1 000-grain weight. Biomass was higher in HYV than in MYV and LYV, while the harvest index was higher in HYV and MYV than in LYV. Yield was inversely correlated with panicle population, but positively correlated with the grain number per panicle, seed-setting rate, the number of primary and secondary branch grains, seed density and harvest index. Yield was most closely linked with the grain number per panicle which was determined chiefly by the number of secondary branch grains and to a lesser degree by seed density and the number of primary branch grains. The seed-setting rate of the secondary branches was positively correlated with that of the whole panicle and yield. The peak value of primary branches for HYV, MYV and LYV was 12-14, 10-13 and 8-12, respectively. LYV had fewer secondary branch grains, while MYV and HYV had more. Such grains distributed mainly in the middle and lower parts of panicle axis for LYV and in the middle and upper parts for MYV and HYV.

关键词： rice grain distribution primary branch secondary branch seed-setting ability

A Novel and Optimized Method for Electro-focusing and Moving Neutralization Reaction Boundary Formed by HCl and NaOH

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第2期12卷 179-182页

作者： shu lin ZHOU Cheng Xi CAO You Zhao HE Wen Kui CHEN Yi Tai QIAN Department of Chemistry University of Science and Technology of ChinaHefei 230026 Institute of Allergy Research Wannan Medical CollegeAnhui Wuhu 241001

A novel method is developed for electro-focusing and moving neutralization reaction boundary (MNRB) created with HCl and NaOH. The optimized conditions are screened out. By using this method, the experiments are performed on MNRB formed with HCl and NaOH in agarose gel. The experiments are quantitatively in coincidence with the predictions with the theory of moving chemical reaction boundary (MCRB).

关键词： Electrolyte Electrolysis Electromigration Isoelectric focusing (IEF) Moving chemical reaction boundary (MCRB)

Two New Cardenolide Glycosides from Biondia hemsleyana

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第6期13卷 547-548页

作者： Xing Gen TAN Xiao Rong ZHANG Ming Kui WANG shu lin PENG Li Sheng DING Chengdu Institute of Biology The Chinese Academy of SciencesChengdu 610041

Two new cardenolide glycosides, biondianosides A and B, were isolated from the roots of endemic plant of Biondia hemsleyana (Warb.) Tsiang. Their structures were elucidated as periplogenin-3-O--D-glucopyranosyl-(16)--D-glucopyranosyl-(14)--D-cymaropyranoside (1) and 17釮-periplogenin-3-O--D-cymaropyranoside (2) by the spectroscopic and chemical methods.

关键词： Biondia hemsleyana cardenolide glycoside biondianosides A and B.

Preparation of Sintered(Ce_(1-x)Nd_x)_(30)Fe_(bal)Cu_(0.1)B_1 Magnets by Blending Powder Method

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2015年第7期22卷 598-601页

作者： shu-lin HUANG Hai-bo FENG Ming-gang ZHU An-hua LI Yue ZHANG Wei LI Functional Materials Research Institute Central Iron and Steel Research Institute School of Materials Science and Engineering University of Science and Technology Beijing Beijing Engineering Laboratory of Advanced Metallic Magnetic Materials and Preparation Techniques

Magnets with nominal compositions of （ Nd1-x Cex ） 30 Febal Cu0.1 B1 （x = 0, 0.15, 0.3 and 0.4, mass% ） have been fabricated by blending powder method. The remanence （B r）, intrinsic coercivity （He） and maximum en- ergy product （BH） of the RE2Fe14B type magnets deteriorated when Nd was replaced by Ce. The chemical composition and crystal structure of magnet were investigated systemically. Backscattered electron （BSE） and energy dispersive spectroscopy （EDS） results revealed that Ce-rich and Ce-lean matrix grains coexisted in the magnets. The magnetic coupling mechanism among the double hard magnetic phases was discussed. Low melting point RE-Cu phase was in favor of the formation of uniform continuous grain boundary. Transmission electron microscopy （TEM） investigation showed the presence of fcc （Nd,Ce）Ox phase in the grain boundary. When the Ce content was 15% of the total amounts of all the rare earth, the maximum energy product of the sintered magnet was 359.8 kJ/ms.

关键词： (Nd1-x Cex ) 30 FebalCu0.1 B1 magnet magnetic property microstructure grain boundary

Dynamic Expression of MicroRNA-127 During Porcine Prenatal and Postnatal Skeletal Muscle Development

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2014年第6期13卷 1331-1339页

作者： YANG Ya-lan LI Yan LIANG Ru-yi ZHOU Rong AO Hong MU Yu-lian YANG shu-lin LI Kui TANG Zhong-lin Key Laboratory of Farm Animal Genetic Resources and Germplasm Innovation Ministry of Agriculture/Institute of Animal ScienceChinese Academy of Agricultural Sciences Department of Animal Genetics Breeding and ReproductionCollege of Animal Science and TechnologyNanjing Agricultural University

MicroRNAs （miRNAs）, evolutionarily conserved non-coding RNAs in length 21-24 bp, play a critical role in skeletal muscle development. In this study, to explore the function of mircoRNA-127 in porcine skeletal muscle development, eight tissue samples from adult pigs and longissimus muscle samples at 26 developmental stages were collected from Tongcheng and Landrace pigs. The spatial-temporal expression proifles of miRNA-127 were carried out using step-loop quantitative real-time PCR （stem-loop RT-PCR）. To explore the molecular functions of miRNA-127, we predicted its target genes and performed functional annotation using bioinformatics methods. Results suggested that miRNA-127 was abundantly expressed in heart, ovary, uterus and spleen tissues and was weakly expressed in liver, lung, kidney and small intestine in both Tongcheng and Landrace pigs. And miRNA-127 showed signiifcant expression differences in heart, ovary, spleen and uterus tissues between these two breeds. miRNA-127 basically kept at a relatively stable high level in middle and later embryonic stages and a low expression level in early embryonic stages and postnatal stages, but the expression levels of miRNA-127 were higher in Tongcheng pigs than in Landrace at most developmental stages. miRNA-127 potentially regulated 240 candidate genes. Results of Gene Ontology and KEGG pathway analysis indicated that these genes could be involved in many molecular functions and mechanisms, such as regulation of the force of heart contraction, regulation of transcription, regulation of T cell differentiation, MAPK signaling pathway and GnRH signaling pathway. Many signiifcantly enriched GO terms and KEGG pathways were related to skeletal muscle development. This study will be helpful to understand the biological function for miRNA-127 and identify candidate gene associated with meat production traits in pigs.

关键词： porcine microRNA-127 expression profiles skeletal muscle development target prediction