检索结果-南通市图书馆

Journal of Iron and Steel Research International 2016年第5期23卷 459-465页

作者： Xiao-ping DONG Yan-rong PANG li-ying yang Qing WANG Zhi-yuan li Department of Mechanics Hebei University

Electrochemical properties of La_（0. 82）Mg_（0. 18）Ni_（3. 50）Co_（0. 15） alloys synthesized by spark plasma sintering（ SPS） were investigated based on the electrochemical measurements,physical parameters and microstructure observation. The sintering behavior of La_（0. 82）Mg_（0. 18）Ni_（3. 50）Co_（0. 15） alloys at the temperatures of 900,950 and 1 000 ℃ is characterized by four stages,i. e.,initial slight shrinkage,expansion,abrupt shrinkage and slight expansion. The maximum shrinkage displacement increases with increasing sintering temperature. All of the alloys consist of（ La,Mg）_2（ Ni,Co）_7 phase; additionally,temperatures of 900 and 950 ℃ are beneficial to the formation of（ La,Mg）（ Ni,Co）_3 phase,whereas the LaNi_5 phase is easy to form in the alloy synthesized by SPS at 1 000 ℃. The electrochemical measurements indicate an evident change of the electrochemical performance of the alloys associated with increasing the sintering temperature. The discharge capacity of the alloys first increases and then decreases as sintering temperature rises,whereas their cycle stability clearly grows all the ***,the charging-discharging potential difference and discharging efficiency both demonstrate that the electrochemical properties of the alloy electrodes first augment and then decline with increasing sintering temperature.

关键词： spark plasma sintering La-Mg-Ni system microstructure electrochemical property

Influence of Ar/N_2 Flow Rate on Structure and Property for TaN/NbN Multilayered Coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2007年第4期23卷 461-464页

作者： Xuehua ZHANG Yuanbin KANG Sipeng liU Qiang li ying yang Xiangyun DENG Dejun li College of Physics and Electronic Information Science Tianjin Normal University Tianjin 300074 China

TaN/NbN multilayered coatings with nanoscale bilayer periods were synthesized at different Ar/N2 flow rates by RF （radio frequency） magnetron sputtering. XRD （X-ray diffraction） and Nano Indenter System were employed to investigate the influence of Ar/N2 flow rate （FAr：FN2） on microstructure and mechanical properties of the coatings. The low-angle XRD pattern indicated a well-defined composition modulation and layer structure of the multilayered coating. All multilayered coatings almost revealed higher hardness than the rule-of-mixtures value of monolithic TaN and NbN coatings. At FAr：FN2=10, the multilayered coating possessed desirable hardness, elastic modulus, internal stress, and fracture resistance, compared with ones synthesized at other Ar/N2 flow rates. The layered structure with strong mixture of TaN （110）, （111）, （200） and Nb2N （101）textures should be related to the enhanced mechanical properties.

关键词： RF magnetron sputtering TaN/NbN multilayered coatings Nanoscale mechnical properties

One-Pot Synthesis of Tetrafluoro- and Tetrachlorofluorescein Derivatives and Their Stabilization by ,6-Cyclodextrin

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2013年第5期31卷 612-616页

作者： li-li Tan ying-Wei yang Yi-Pu liu Sean Xiao-An Zhang State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun Jilin 130012 China

A highly efficient one-pot procedure for the preparation of fluorescein-based dyes with relatively high yield was investigated. Significantly, introduction of these fluoro and chloro functional groups and forming host... 详细信息

关键词： fluorescein cyclodextrin photostability cucurbituril one-pot synthesis supramolecular chemistry

Characterization,Expression Pattern Analysis,and Cellular Localization of Two Homologous MUC2 Genes in Japanese Flounder(Paralichthys olivaceus)

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 Ocean University of China 2024年第4期23卷 1035-1044页

作者： ZHU ying yang Xinsheng li Zhengjie li Chao School of Marine Science and Engineering Qingdao Agricultural UniversityQingdao 266109China

As a member of mucins family,MUC2 is an important component of mucus,which is characterized by tandem and irregular repeat sequences rich in threonine and *** is strongly expressed by goblet cells that are involved in innate *** flounder is an economically important marine *** this study,two homologous genes of MUC2 were identified,named MUC2-1 and *** on phylogenetic and structural analysis,MUC2-1 and MUC2-2 were clustered in two clades,*** olivaceus MUC2-1 showed a closer relationship with MUC2 in the higher *** healthy tissues were analyzed to determine the expression patterns,and both MUC2 genes showed high expression levels in the gills and *** Edwardsiella tarda challenge,*** MUC2-1 and MUC2-2 both showed significant up-regulated expression in intestine and ***,MUC2-1 was significantly up-regulated in gill cell lines following PGN and polyI:C stimulation,and MUC2-2 was significantly up-regulated in gill cell lines following LPS *** addition,ISH results revealed that MUC2-1 and MUC2-2 showed the same tissue localization in intestine tissues,but displayed different localization in *** siRNA-mediated knockdown of MUC2-1 and MUC2-2 genes in the gill cell lines of Japanese flounder affected the expressions of galnt family genes and smad pathway members that are related to mucosal *** results provided a valuable insight into understanding the functions of MUC2 on mucosal immune system in response to the invasion of bacterial pathogen.

关键词： MUC2 ISH Edwardsiella tarda Paralichthys olivaceus

Fast Determination of Ethylendiamine in Aminophylline Tablets by Small-sized Capillary Electrophoresis with Amperometric Detection

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2013年第4期31卷 525-528页

作者： Jinyuan Ge Fanghong Tong ying li yang Zhang Qingcui Chu Jiannong Ye Department of Chemistry East China Normal University Shanghai 200241 China

A novel method for fast determination of ethylendiamine （EDA） in Aminophylline Tablets has been developed by small-sized capillary electrophoresis with amperometric detection （small-CE-AD） coupled with field-amplified sample injection （FASI）. Under the optimum conditions, EDA and four aliphatic diamine homologs （1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane and 1,6-diaminohexane） could be well separated within 6 min at a separation voltage of 2.0 kV in an acetate buffer solution of pH 3.8 with low limit of detection （LOD） of 1.3 × 10^-11 g/mL for EDA （S/N=3）. The proposed method has been successfully applied to direct deter- mination of EDA content in different batches of Aminophylline Tablets. The method does not require off-line preconcentration and derivatization steps, which should find wide application fields including pharmaceuticals as an alternative to conventional and microchip CE approaches.

关键词： ethylendiamine aminophylline tablets small-sized capillary electrophoresis-amperometric detection on-line field-amplified sample injection

Solidification crack characteristics and sensitivity of peritectic steel

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 Iron and Steel Research International 2024年第7期31卷 1668-1679页

作者： Ya-qiang li Jian-hua liu Zi-ming Wang ying-ying li yang He Xiao-wei li Department of Automotive Engineering Hebei Vocational University of Technology and EngineeringXingtai 054000HebeiChina Hebei Special Vehicle Modification Technology Innovation Center Hebei Vocational University of Technology and EngineeringXingtai 054000HebeiChina Institute of Engineering Technology University of Science and Technology BeijingBeijing 100083China School of Petroleum and Natural Gas Engineering Changzhou UniversityChangzhou 213164JiangsuChina

The characteristics and sensitivity of solidification cracks in peritectic steels were investigated using directional solidifi-cation *** cracks were observed in both hypoperitectic steels(12CrlMoV,15CrMo)and hyper-peritectic steel(20CrMo)during solidification at growth velocities of 15,50,and 80 pm/*** the dendritic boundaries,sulphide precipitates were found,promoting crack *** on the statistical analysis of interdendritic cracks in peritectic steels,the area ratio(RA)of interdendritic cracks in a directional solidification structure was proposed to evaluate the crack sensitivity of peritectic ***,the crack sensitivities of peritectic steels(12CrlMoV,15CrMo,and 20CrMo)were tested,evaluated,and compared with the surface crack rates of three types of steels produced from a steel *** results demonstrated that RA was in good agreement with that of the steel plant,and the crack sensitivity of 12CrlMoV steel was the strongest,followed by that of 15CrMo and 20CrMo ***,RA can be used to evaluate the crack sensitivity of peritectic steel.

关键词： Peritectic steel-Directional solidification Growth velocity Dendritic structure Solidification crack Crack sensitivity

Low-protein diet supplemented with 1% L-glutamine improves growth performance, serum biochemistry, redox status, plasma amino acids, and alters fecal microbiota in weaned piglets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2024年第2期17卷 144-154页

作者： Jun li Jun Bai ying yang Zhenlong Wu State Key Laboratory of Animal Nutrition and Feeding Department of Companion Animal Science China Agricultural University

Glutamine, one of the most abundant amino acids in the body, has been shown to exert various beneficial effects in pigs. However, knowledge regarding the role of dietary glutamine in low-protein diet-fed piglets remains scarce. The present study aimed to investigate the effects of different levels of L-glutamine on growth performance, serum biochemistry parameters, redox status, amino acids, and fecal microbiota in low-protein diet-fed piglets. A total of 128 healthy crossbred piglets(Landrace × Yorkshire)were randomly allocated into 4 groups of 4 replicate pens, with 8 piglets per pen. Piglets in the 4 groups were fed with corn and soybean meal-based low-protein diets(crude protein level, 17%) that contained0%, 1%, 2%, and 3% L-glutamine, respectively, for 28 d. Pigs administered 1% L-glutamine had greater body weight on d 28 and average daily gain(ADG, P line content(P < 0.05). Additionally, 1% Lglutamine upregulated the abundance of p＿75＿a5, Clostridium, Lactobacillus, Prevotellaceae＿Prevotella,and Gemmiger in the stool of piglets on d 14, with the Streptococcus lev

关键词： Glutamine Low protein diet Pig Redox status Amino acid Microbiota

Navigation Finsler metrics on a gradient Ricci soliton

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 266-275页

作者： li ying MO Xiao-huan WANG Xiao-yang Department of Applied Mathematics Zhejiang University of TechnologyHangzhou 310023China Key Laboratory of Pure and Applied Mathematics School of Mathematical SciencesPeking UniversityBeijing 100871China School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081China

In this paper,we study a class of Finsler metrics defined by a vector field on a gradient Ricci *** obtain a necessary and sufficient condition for these Finsler metrics on a compact gradient Ricci soliton to be of isotropic S-curvature by establishing a new integral *** we determine the Ricci curvature of navigation Finsler metrics of isotropic S-curvature on a gradient Ricci soliton generalizing result only known in the case when such soliton is of Einstein *** its application,we obtain the Ricci curvature of all navigation Finsler metrics of isotropic S-curvature on Gaussian shrinking soliton.

关键词： gradient Ricci soliton navigation Finsler metric isotropic S-curvature Ricci curvature Gaussian shrinking soliton

p53 gene therapy in combination with transcatheter arterial chemoembolization for HCC:One-year follow-up

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第16期17卷 2143-2149页

作者： Yong-Song Guan Yuan liu Qing He Xiao li lin yang ying Hu Zi La Department of Oncology West China HospitalSichuan University Chengdu 610041 Sichuan Province China

AIM:To evaluate the efficacy and safety of combination therapy with recombinant adenovirus p53 injection (rAdp53) and transcatheter hepatic arterial chemoembolization (TACE) for advanced hepatocellular carcinoma (HCC).METHODS:A total of 82 patients with advanced HCC treated only with TACE served as control *** 68 patients with HCC treated with TACE in combination with recombinant adenovirus-p53 injection served as p53 treatment *** were followed up for 12 *** and therapeutic effects were evaluated according to the improvement in clinical symptoms,leukocyte count,Karnofsky and RECIST *** rate was calculated with Kaplan-Meier ***:The total effective rate was 58.3% for p53 treatment group,and 26.5% for control group (P lications were *** respect to the efficacy,patients in p53 treatment group had less gastrointerestinal symptoms (P=0.062),better improvement in tumor-related pain (P=0.003),less downgrade of leukocyte counts (P=0.003) and more upgrade of Karnofsky performance score (P=0.029) than those in control *** total effective rate (CR + PR) for p53 treatment group and control group was 58.3% and 26.5%,respectively,with distributions of different effect in two groups (P=0.042).The survival rates were 89.71%,76.13%,and 43.30% for p53 treatment group,and 68.15%,36.98%,and 24.02% for control group,respectively,3,6 and 12 mo after treatment,suggesting that the survival rates are significantly higher for p53 tre

关键词： Adenovirus p53 Clinical trial Hepatocellular carcinoma Transcatheter hepatic arterial chemoembolization p53 gene therapy

Mars exploration——In situ K-Ar dating of jarosite

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 Earth Sciences 2024年第3期67卷 641-656页

作者： Jing yang Dewen ZHENG ying WU Hong CHEN li yang Bin ZHANG Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Institute of Earth Sciences China University of GeosciencesBeijing 100083China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029Chin

To accurately determine the chronological framework of climatic variations recorded by various Martian terrains, the absolute ages of Martian events and cratering rate need to be constrained by either in situ dating or returned samples. In situ K-Ar dating is currently a more plausible dating technique as compared with sample return. Jarosite(KFe_(3)[SO_(4)]_(2)[OH]_(6)) is the only confirmed K sulfate mineral that is widely present on Mars, as indicated by in situ detection, orbital remote sensing, and meteorite studies. Jarosite can be used for precise K-Ar and (40)Ar/(39)Ar dating. The preservation of jarosite on Mars provides information about the nature and duration of aqueous processes on the Martian surface. Different ages of Martian jarosite represent the key to constraining the transition from Martian surface water activity to arid climatic conditions. This paper summarizes recent advances in our knowledge of the spatial distribution of Martian jarosite, its mineralogical properties and stability on Mars, the Ar diffusion kinetics of jarosite, and the current status of in situ K-Ar dating. Moreover, we examine the key scientific issues to be addressed for in situ K-Ar dating of jarosite and Martian sample return missions, and discuss future research directions.

关键词： Mars Jarosite In situ K-Ar dating Ar diffusion Stability