检索结果-南通市图书馆

Study on the oxidation mechanism of Al-SiC composite at elevated temperature

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2077-2087页

作者： Jishuo Han Yong Li Chenhong Ma qingyao Zheng Xiuhua Zhang Xiaofang Wu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Vesuvius Advanced Ceramics(China)Co. LtdSuzhou 215000China

Resin-bonded Al-SiC composite was sintered at 1100,1300,and 1500℃ in the air,the oxidation mechanism was *** reaction models were also *** oxidation resistance of the Al-SiC composite was significantly enhanced with temperature *** in the exterior of the composite was partially oxidized slightly,while the transformation of metastable Al_(4)C_(3) to stable Al_(4)SiC_(4) existed in the *** 1100℃,Al in the interior reacted with residual C to form Al_(4)C_(3).With increasing to 1300℃,high temperature and low oxygen partial pressure lead to active oxidation of SiC,and internal gas composition transforms to Al_(2)O(g)+CO(g)+SiO(g)as the reaction *** Al_(4)C_(3) is formed,CO(g)and SiO(g)are continuously deposited on its surface,transforming to Al_(4)SiC_(4).At 1500℃,a dense layer consisting of SiC and Al_(4)SiC_(4) whiskers is formed which cuts off the diffusion channel of *** active oxidation of SiC is accelerated,enabling more gas to participate in the synthesis of Al_(4)SiC_(4),eventually forming hexagonal lamellar Al_(4)SiC_(4) with mutual accumulation between SiC *** Al enhances the oxidation resistance of *** addition,the in situ generated non-oxide is uniformly dispersed on a micro-scale and bonds SiC stably.

关键词： Al-SiC composite kiln furniture Al_(4)SiC_(4) Al_(4)C_(3) oxidation mechanism

Identification of suitable reference genes for quantitative gene expression analysis in clam Cyclina sinensis under salinity stress and Vibrio infection

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第1期41卷 352-363页

作者： Fengjuan JIANG qingyao WANG Jingjing DU Fu LÜ Qing NIE Weihong ZHAO College of Marine and Biological Engineering Yancheng Institute of TechnologyYancheng 224051China

The appropriate reference gene is a prerequisite for accurate normalization of gene expression level,and research on suitable reference genes in clam Cyclina sinensis is *** improve the situation,we selected five commonly used housekeeping genes,including β-actin,Elongation factor 1-α(EF1-α),Glyceraldehyde-3-pho sphate dehydrogenase(GAPDH),40S ribosomal protein S18(RPS18),and Tubulin a(TUB-α),then evaluated their expression stability in different adult tissues and under different experimental treatments(salinity stress and Vibrio parahaemolyticus infection).Their expression stability was analyzed by three frequently used programs,geNorm,NormFinder,and *** analysis indicated that multiple genes should be used for normalization,and we concluded that the reference gene combination GAPDH-RPS18-β-actin,should be used for qRT-PCR analysis in different tissues of *** under normal physiological *** the clams under salinity stress and Vibrio infection,EF1-α-GAPDHRPS18 was recommended as the gene combination for qRT-PCR ***-αwas generally poorly ranked by all programs,and should not be used in future *** study should provide fundamental support for accurate quantitative gene expression analysis of this species.

关键词： Cyclina sinensis reference gene different tissues salinity stress Vibrio infection

Derivation of Benzothiadiazine-1,1-dioxide Scaffolds via Transition Metal-Catalyzed C-H Activation/Annulation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第16期41卷 1973-1978页

作者： Ruizhi Lai shuran Xu qingyao Zhang Hui Zhou Cankun Luo Yuerong Wang Li Hai Yong Wu Key Laboratory of Drug Targeting and Drug Delivery System of the Education Ministry and Sichuan Province Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmagySichuan UniversityChengduSichuan 610041China

Comprehensive Summary Benzothiadiazine-1,1-dioxide scaffold is bioactive framework with wild utility and *** of benzothiadiazine-fused isoquinoline derivatives and spiro benzothiadiazine derivatives through transition metal-catalyzed C—H activation/annulation was reported.3-Phenyl-2H-benzothiadiazine-1,1-dioxide was used as the reaction substrate,and vinylene carbonate and 4-diazopyrazolone were used as the coupling reagents,*** strategy provides straightforward access to complex N-heterocycles in a highly efficient and simple manner.

关键词： C-H activation Annulation Ruthenium Rhodium Heterocycles Fused-ring systems Spiro compounds Diazo compounds

Carbon materials from melamine sponges for supercapacitors and lithium battery electrode materials: A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2019年第2期1卷 253-275页

作者： Yanying Shi Guijing Liu Rencheng Jin Hui Xu qingyao Wang Shanmin Gao School of Chemistry and Materials Science Ludong UniversityYantaiChina

With the increasing energy demand together with the deteriorating environment and decreasing fossil fuel resources,the development of highly efficient energy conversion and storage devices is one of the key challenges of both fundamental and applied research in energy *** sponges(MS)with low density,high nitrogen content,and high porosity have been used to design and obtain three‐dimensional porous carbon electrode *** importantly,they are inexpensive,environment‐friendly,and easy to *** have been many reports on the modification of carbonized MS and MS‐based composites for supercapacitor and lithium battery electrode *** this paper,recent studies on the fabrication of electrode materials using MS as raw materials have been mainly reviewed,including carbonation,doping activation,and composite modification of MS,and expectations for the development of porous carbon materials for energy storage as a reference with excellent performance,environment‐friendliness,and long life.

关键词： activation carbon materials composites electrode materials melamine sponges

Modeling urban intersection form:Measurements,patterns,and distributions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2021年第1期10卷 33-49页

作者： Jun Cao Junkai Zhu qingyao Zhang Ke Wang Junyan Yang Qiao Wang School of Architecture Southeast UniversityNanjingChina School of Information Science and Engineering Southeast UniversityNanjinsChina Institute for Urban Research University of PennsylvaniaPennsylvaniaUSA

Intersections appear where one street crosses another,acting as fundamental nodes embedded in the network of urban public *** discussed in configurationa and perceptive studies,limited attention has been paid to the morphological aspects of *** study proposes and tested a new approach to modeling the urban intersection ***,effective cylinder was introduced to define the related space for each intersection based on its ***,a set of morphological indicators were presented to measure the physical properties of the intersection ***,the affinity propagation algorithm was used to examine the patterns of intersection *** the Old City of Nanjing,China as the study area,844 intersections were analyzed to test this new *** a result,we were able to classify the intersections into eight *** study shows that the intersection can be modelled as a volumetric and integral spatial unit of urban form,which may demand more attention from urban designers and architects in the future for shaping the built *** quantitative nature of our method could also open more possibilities for intersection-based studies.

关键词： Urban intersections Urban morphology Intersection pattern Urban modeling Built environment Urban design

A photoactive process cascaded electrocatalysis for enhanced methanol oxidation over Pt-MXene-TiO2 composite

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第10期13卷 2683-2690页

作者： Yue Sun Yunjie Zhou Yan Liu qingyao Wu Mengmeng Zhu Hui Huang Yang Liu Mingwang Shao Zhenhui Kang Institute of Functional Nano and Soft Materials Laboratory(FUNSOM) Jiangsu Key Laboratory for Carbon Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China

Highly efficient photo-assisted electrocatalysis for methanol oxidation reaction(MOR)realizes the conversion of solar and chemical energy into electric energy *** we report a Pt-MXene-TiO2 composite for highly efficient MOR via a photoactive cascaded electro-catalytic *** light(UV and visible light)irradiation,MXene-TiO2 serves as the photo active centre(photoinduced hole)to activate the methanol molecules,while Pt particles are the active centre for the following electro-catalytic oxidation of those activated methanol ***-MXene-TiO2 catalyst exhibits a lower onset potential(0.33 V)and an impressive mass activity of 2,750.42 mA·mg^−1 Pt under light *** represents the highest MOR activity ever reported for photo-assisted ***-MXene-TiO2 also shows excellent CO tolerance ability and stability,in which,after long-term(5,000 s)reaction,still keeps a high mass activity of 1,269.81 mA·mg−1Pt(62.66%of its initial activity).The photo-electro-catalytic system proposed in this work offers novel opportunities for exploiting photo-assisted enhancement of highly efficient and stable catalysts for MOR.

关键词： photoactive process electrocatalysis cascade photoelectrochemistry methanol oxidation reaction

Rational construction of metal–base synergetic sites on Au/Mg-beta catalyst for selective aerobic oxidation of 5-hydroxymethylfurfural

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 Energy Chemistry 2021年第11期30卷 599-609,I0014页

作者： Zhiguo Zhu Xiongjie Gao Xiuming Wang Mengdie Yin qingyao Wang Wanzhong Ren Bo Wang Hongying Lü Weiping Liao College of Chemistry and Chemical Engineering Yantai University30 Qingquan RoadYantai 264005ShandongChina Library Yantai University30 Qingquan RoadYantai 264005ShandongChina Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059ShandongChina

The selective aerobic oxidation of biomass-derived 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid (FDCA, a potential renewable substitution of fossil-based terephthalic acid to produce polyethylene 2,5-furandicarboxylate plastic) is an appealing transformation for constructing eco-friendly and sustainable chemical processes. Au supported catalysts have showed encouraging performances for this well-received conversion, whose catalytic behavior was greatly affected by the adopted support derived from the existence of metal-support interactions. Herein, a series of Mg-Beta zeolites were hydrothermally synthesized via developed structural reconstruction, which were employed as basic supports for Au catalysts to construct bifunctional catalysts. The relationship between structure (Au particle size, basicity within zeolites and Auδ+ contents) and FDCA yield was concretely established. The conclusion was made that the utilization of Mg-Beta zeolites with strong basicity as the support could not only improve the FDCA yield but also decrease the amount of additional base. Furthermore, the possible reaction mechanism was also proposed via tracking time-dependent variations of corresponding organics and controlled experiment. This work provides some guidance for rationally designing multifunctional catalysts in the view of integrating metal catalysts with metallosilicate zeolites, which was beneficial to the catalytic upgrading of organic compounds with multiple functional groups.

关键词： 5-Hydroxymethylfurfural Aerobic oxidation 2,5-Furandicarboxylic acid Bifunctional Au/Mg-Beta catalyst Structural reconstruction

Effects of electroporation on primary rat hepatocytes in vitro

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2002年第5期8卷 893-896页

作者： Yun-qingyao Ding-FengZhang DepartmentofInfectiousDiseasesoftheFirstAffiliatedHospital ChongqingUniversityofMedicalSciencesChongqing400016 DepartmentofInfectiousDiseasesoftheFirstAffiliatedHospital ChongqingUniversityofMedicalS

AIM: To investigate the effects of electroporation on primaryrat hepatocyte and to optimize the electroporation conditionsintroducing foreign genes into primary ***: A single-pulse procedure was performed at Iowvoltage (220-400 V) but with high capacitance (500-950 μF).Hepatocytes were divided into 4 groups according to theelectroporation conditions: group Ⅰ, 220 V and 500 μF;group Ⅱ, 220 Vand 950 μF; group Ⅲ, 400 V and 950 μF,and group Ⅳ.The control group was freshly isolatedhepatocytes and directly cultured under the same conditionsas those of electroporation groups. The effects ofelectroporation on primary rat hepatocytes were detectedby trypan blue exclusion (TBE) and MTT analysis. Besides,albumin (AIb), alanine transaminase (ALT) and lactatedehydrogenase (LDH) in the supernatants of culturedhepatocytes were measured by biochemical ***: Between day 1 and day 15 after incubation,primary rat hepatocytes of each electroporation groupappeared normal, being the same with those of controlgroup. TBE staining showed that slight hepatocyte damageand high survival rate were found in the electroporationgroups and the control group. Cultured for 3, 7, 11 and 15days, hepatocyte viability was approximatly 92.6±2.5 %,89.5±3.3 %, 82.0±3.5 % and 74.3±1.2 %, *** analysis indicated that the viabilities of hepatocyteshad no significant difference between each electroporationgroup, and those were similar to that of control group. Atthe 36th hour after electroporation, AIb, ALT and LDH in thesupernatants of control group were 5.3±0.1 g. L-1, 183.7±8.4 nkat. L-1 and 896.8±58.5 nkat. L-1; those of group Ⅱwere 5.7±0.1 g. L-1, 215.4±16.7 nkat. L-1 and 1063.8±51.8 nkat. L-1; and those of group Ⅲ were 5.80.2 g. L-1,217.1 ± 8.4 nkat. L-1 and 1063.8± 10.0 nkat. L-1 . Statistically,the proteins of group Ⅱ and group Ⅲ were significantlyhigher than those of control group (P＜0.05), whereas theprotein production of group Ⅰ, AIb, ALT and LDH were 5.3±0.2 g. L

关键词：电穿孔治疗肝癌外源性基因实验研究 MTT法

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bt基因在水稻杂种后代的优势表现

上海农业学报 2004年第3期20卷 28-31页

作者：陈业坚舒庆尧吴其褒张增勤刘守平何方印浙江省台州市农科院临海317000 浙江大学核农业科学研究所杭州310029 浙江省三门县种子站三门317100

以克螟稻Ts5为亲本与另 5个感虫亲本作正反杂交 ,结果表明 ,10个杂交组合的F1 中 ,以Ts5为父本所配组合杂种优势强于以Ts5为母本所配的组合。F2 的抗虫株与非抗虫株群体在农艺性状上无显著差异 ;但某些农艺性状 ,F2 的抗虫株、非抗虫株... 详细信息

以克螟稻Ts5为亲本与另 5个感虫亲本作正反杂交 ,结果表明 ,10个杂交组合的F1 中 ,以Ts5为父本所配组合杂种优势强于以Ts5为母本所配的组合。F2 的抗虫株与非抗虫株群体在农艺性状上无显著差异 ;但某些农艺性状 ,F2 的抗虫株、非抗虫株群体与亲本相比 ,达显著或极显著差异。F3的抗虫株与非抗虫株群体及亲本在分蘖动态变化上无显著差异。上述试验结果为低代抗虫株系的田间筛选提供了参考依据。

关键词： Bt基因水稻杂种优势农艺性状