检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

提高岩溶桥梁桩基质量的应用研究

建筑技术开发 2024年第4期51卷 98-100页

作者：刘震朱石磊林欢周晓龙方胜深中国建筑第二工程局有限公司南宁530022

广西区域喀斯特地貌的特殊地质,其中溶洞、地下河、暗湖、石钟乳、石笋对于桥梁桩基的影响尤为严重,溶洞良好的处理及桩基的完整性是整个线性工程中桥梁质量把控中关键的一环;桥梁桩基的质量决定了桥梁整体的稳定性及安全性。利用合理... 详细信息

广西区域喀斯特地貌的特殊地质,其中溶洞、地下河、暗湖、石钟乳、石笋对于桥梁桩基的影响尤为严重,溶洞良好的处理及桩基的完整性是整个线性工程中桥梁质量把控中关键的一环;桥梁桩基的质量决定了桥梁整体的稳定性及安全性。利用合理的施工工艺及溶洞处理方式方法来提高岩溶桥梁桩基的成桩质量合格率及施工效率,同时达到降本增效的目的。

关键词：溶岩桥梁桩基溶洞处理冲孔灌注桩

Electrolytic silicon/graphite composite from SiO_(2)/graphite porous electrode in molten salts as a negative electrode material for lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第2期41卷 438-447页

作者： Ning Wang Yu-Yang Liu Zhi-Xia Shi Zhang-Long Yu Hua-Ying Duan sheng fang Juan-Yu Yang Xing-Ming Wang GRIREM Advanced Materials Co. Ltd.China Automotive Battery Research Institute Co.Ltd.General Research Institute for Nonferrous MetalsBeijing 100088China GRINM Resources and Environment Tech.Co.Ltd. General Research Institute for Nonferrous MetalsBeijing 100088China China Automotive Battery Research Institute Co.Ltd. General Research Institute for Nonferrous MetalsBeijing 100088China

Nano-silicon(nano-Si)and its composites have been regarded as the most promising negative electrode materials for producing the next-generation Li-ion batteries(LIBs),due to their ultrahigh theoretical ***,the commercial applications of nano Si-based negative electrode materials are constrained by the low cycling stability and high *** molten salt electrolysis of SiO_(2)is proven to be suitable to produce nano-Si with the advantages of in-situ microstructure control possibilities,cheap affordability and scale-up process ***,an economical approach for electrolysis,with a SiO_(2)/graphite porous electrode as cathode,is adopted to produce nano-Si/graphite composite negative electrode materials(SGNM)in this *** electrolytic product of the optimized porous electrode is taken as the negative electrode materials for LIBs,and it offers a capacity of 733.2 mAh·g^(-1)and an initial coulombic efficiency of 86.8%in a coin-type ***,the capacity of the SGNM retained 74.1%of the initial discharging capacity after 50 cycles at 0.2C,which is significantly higher than that of the simple mixture of silicon and graphite obtained from the formation of silicon carbide(SiC)between nano-Si and graphite ***,this new approach can be applied to a large-scale production.

关键词： Li-ion battery Negative electrode materials Molten salt electrolysis Nano-silicon

Morphological and ISSR molecular markers reveal genetic diversity of wild hawthorns (Crataegus songorica K. Koch.) in Xinjiang, China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第11期16卷 2482-2495页

作者： sheng fang CHEN Shu-ying TIAN Jia LI Peng QIN Xue WANG Lei LUO Shu-ping LI Jiang College of Forestry and Horticulture Xinjiang Agricultural University Urumqi 830052 P.R. China Academy of Forestry in Ili Yining 835000 P.R. China Zhengzhou Fruit Research Institute Chinese Academy of Agricultural Sciences Zhengzhou 450009 P.R. China

The wild hawthorn species, Crataegus songorica K. Koch., is an important wild germplasm resource in Xinjiang, China that has been endangered in recent years. The genetic diversity of C. songorica K. Koch. germplasm in five populations from Daxigou, Xinjiang, China were evaluated based on phenotypic traits and ISSR molecular markers to provide basic infor- mation on resource protection, rational utilization and genetic improvement. The F-value for the phenotypic differentiation coefficient of the 33 traits measured ranged from 0.266 to 15.128, and mean value was 13.85%. The variation among populations was found to be lower than that within population. A total of 303 loci were detected within the five populations by 12 primers. Within 298,polymorphic loci, the polymorphism was 98.35%, showing a high genetic diversity in C. songorica K. Koch. The gene diversity within population, total population genetic diversity, genetic differentiation coefficient and gene flow were 0.2779, 0.3235, 0.1408, and 3.0511, respectively. Our results showed that C. songorica K. Koch. from Xinjiang has a high level of genetic diversity at both the phenotypic and molecular levels. Significant genetic differentiation existed within population and the differentiation trend showed a regional association. And in this study, in situ and ex situ conser- vation approaches were raised for wild hawthorn protection utilization.

关键词： phenotypic traits ISSR marker genetic diversity Crataegus songorica K. Koch. germplasm resources molecular marker

Molecular recognition of cyclophanes in water

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第5期35卷 32-44页

作者： fang-Yuan Chen Wen-Chao Geng Kang Cai Dong-sheng Guo College of Chemistry State Key Laboratory of Elemento-Organic ChemistryKey Laboratory of Functional Polymer Materials(Ministry of Education)Frontiers Science Center for New Organic MatterCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Nankai UniversityTianjin 300071China College of Chemistry Nankai UniversityTianjin 300071China

Molecular recognition in water,the biological solvent,always receives significant research focus in supramolecular *** mechanisms of molecular recognition in water is key to comprehending biological processes at the molecular *** the past five decades,supramolecular chemists have developed a vast array of synthetic receptors with highly diverse structures and recognition *** them,cyclophanes represent an important family of macrocyclic receptors that have been extensively *** aromatic moieties in cyclophanes not only facilitate chemical modifications to impart water solubility but also enable forming hydrophobic cavities for guest inclusion in aqueous *** by Koga et al.,who reported the first inclusion complex of cyclophanes in water and solid state,numerous water-soluble cyclophanes,including derivatives of blue box,calixarenes,resorcinarenes,pillararenes,octopusarenes,biphenarenes,coronarenes,and naphthotubes,etc.,have been synthesized and subjected to investigation of the recognition capabilities in aqueous *** review provides an overview of cyclophane receptors designed to bind organic guests in *** categorize them into two classes based on the modifications made to their hydrophobic cavities:those with“exo-functionalized hydrophobic cavities”and those with“endo-functionalized hydrophobic cavities”.We introduce their distinctive features and discuss strategies to enhance recognition affinity and *** review aims to inspire the development of novel synthetic receptors with intriguing properties and foster practical applications of cyclophanes.

关键词： Biomimetic receptor Cyclophane Molecular recognition Hydrophobic effect High-affinity Macrocycles

Occurrence and Diversity of Pichia spp. in Marine Environments

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2008年第3期7卷 281-286页

作者： LI Jing CHI Zhenming WANG Xianghong WANG Lin sheng Jun GONG fang Unesco Chinese Center of Marine Biotechnology Ocean University of China Qingdao 266003 P. R. China

A total of 328 yeast strains from seawater, sediments, mud of salterns, the guts of marine fish and marine algae were obtained. The results of routine identification and molecular methods show that five yeast strains obtained in this study belonged to Pichia spp., including Pichia guilliermondii 1 uv-small, Pichia ohmeri YF04d, Pichia fermentans YF12b, Pichia burtonii YF11A and Pichia anomala YF07b. Further studies revealed that Pichia anomala YF07b could produce killer toxin against pathogenic yeasts in crabs while Pichia guilliermondii luv-small could produce high activity of extracellular inulinase. It is advisable to test if Pichia ohmeri YF04d obtained in this study is related to central-venous-catheter-associated infection.

关键词： Marine yeasts Pichia killer toxin inulinase

Unconventional phonon spectra and obstructed edge phonon modes

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 114-118页

作者： Ruihan Zhang Haohao sheng Junze Deng Zhong fang Zhilong Yang Zhijun Wang Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Based on the elementary band representations(EBR),many topologically trivial materials are classified as unconventional ones(obstructed atomic limit),where the EBR decomposition for a set of electronic states is not consistent with atomic valenceelectron band *** the work,we identify that the unconventional nature can also exist in phonon spectra,where the EBR decomposition for a set of well-separated phonon modes is not consistent with atomic vibration band representations(ABR).The unconventionality has two types:typeⅠis on an empty site;and typeⅡis on an atom site with non-atomic vibration *** unconventionality is described by the nonzero real-space invariant at the *** detailed calculations show that the black phosphorus(BP)has the typeⅠunconventional phonon spectrum,while 1H-Mo Se_(2)has the typeⅡone,although their electronic structures are also ***,the obstructed phonon modes are obtained for two types of unconventional phonon spectra.

关键词： unconventional phonon spectra obstructed edge phonon mode typeⅠ&typeⅡunconventionality

Dynamic change of protein polypeptide of Ginkgo biloba seed during germination

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2007年第1期18卷 35-38页

作者： GUO Hong-yan LI sheng-ping PENG fang-ren College of Forest Resources and Environment Nanjing Forestry University Nanjing 210037 P. R.. China

The dynamic changes of protein polypeptide in endosperms of Gingkgo biloba seeds during seed germination were studied by SDS-PAGE and two-dimensional gel electrophoresis （2-DE）. The results showed that 80 kinds of protein spots in endosperms of Gingkgo biloba were clear observed in the 2-DE spectrum. Protein molecular weights were in the range of 26-52kD, and their isoelectric points were in the range of 5.8-7.8. In the course of seed germination, 13 kinds of proteins were degraded, and 13 kinds of proteins were synthesized; 7 kinds of proteins with different molecular weights and isoelectric points of 35kD/pIr.8, 31kD/pIr.8, 29kD/pIr.8, 33kD/pI6.6, 33kD/pI 6.4, 34kD/pI7.7 and 31kD/pI7.7 were identified primarily as vegetative storage proteins （VSPs）.

关键词： Ginkgo biloba seed Germination Protein Electrophoresis

Defect-rich bismuth metallene for efficient CO_(2) electroconversion

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2023年第8期42卷 11-16页

作者： Bo-Qiang Miao Wen-sheng fang Bin Sun Fu-Min Li Xiao-Chen Wang Bao-Yu Xia Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an710062PR China School of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education)Hubei Key Laboratory of Material Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology(HUST)1037 Luoyu RdWuhan430074PR China

*** Carbon dioxide reduction(CO_(2)RR)technology has attracted much attention in recent years and can effectively decrease the greenhouse effect and simultaneously achieve chemical energy storage[1].In the electrochemical process,a large overpotential is generally required to activate inert CO_(2)molecules,resulting in the inevitable competition reaction from the hydrogen evolution reaction(HER)and consequently decreasing the faradaic efficiency of CO_(2)RR[2,3].Among various reduction products of CO_(2)RR,formate is the most prevalent product with important applications in the energy conversion and chemical *** a host of catalysts that can convert CO_(2)to formate,bismuth(Bi)-based nanomaterials are highly promising electrocatalysts for the conversion of CO_(2)to formate due to their high faradaic efficiency and good ***,the preparation method and catalytic activity of Bi-based nanomaterials still need to be further improved for industrial conversion of the CO_(2)RR.

关键词： stability. bismuth dioxide

Experimental research on influence of emulsifier on crystallization quantity of emulsion explosives under dynamic pressure

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 Coal Science & Engineering(China) 2011年第1期17卷 100-103页

作者： HUANG Wen-yao YAN Shi-long WU Hong-bo YUAN sheng-fang School of Chemical Engineering Anhui UniversiO of Science and Technology Huainan 232001 China

Dynamic pressure was applied on emulsion explosive by using an underwater explosion measuring apparatus, and the crystallization quantity was measured by dissolution method after emulsion explosive was pressed; the influence of emulsi- fier content and type was analyzed. The experimental results show that emulsifier content and type have an important effect on crystallization quantity of emulsion explosive. The crystallization quantity will reduce with Span-g0 content from 2% to 4%, so the demulsification and crystallization will decrease if the emulsifier content improves appropriately and the dynamic pressure resistance will increase. For emulsion explosive emulsified by T-152 and Span-g0, the crystallization quantity with T-152 is less than that of Span-g0 under the same dynamic pressure. This shows that the emulsifying effect ofT-152 is better than Soan-80.

关键词： emulsion explosives crystallization emulsifier dynamic pressure applied chemistry