检索结果-南通市图书馆

Nuclear Science and Techniques 2017年第6期28卷 123-132页

作者： chuan li Chao Fang Chen Yang Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua University

Chrome-molybdenum steel(2·1/4Cr1Mo) is one of the main products of steam *** adsorption behaviors of radioactive fission products on2·1/4Cr1Mo surface are critical in the analysis of ***,the adsorption behavior of cesium,strontium,silver and iodine on 2·1/4Cr1Mo was investigated with first-principle calculations that the Ag and I atoms prefer to be adsorbed at the square hollow site of the face-centered cubic iron cell with a binding energy of about 1 and 3 eV,*** contrast,Cs and Sr atoms are not adsorbed on the surface of the 2·1/*** results are again confirmed via analysis of charge density differences and the densities of ***,the adsorption rates of these fission products show that only I and Ag have significant adsorption on the metal *** adsorption results explain the amount of adsorbed radionuclides for an evaluation of nuclear safety in *** micro-pictures of the interaction between fission products and materials are a new and useful way to analyze the source term.

关键词： First-principle calculation Fission product Adsorption behavior HTR-PM

Extreme Tenacity of Graphs with Given Order and Size

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2014年第3期2卷 307-315页

作者： T.C.E.Cheng yin-Kui li chuan-Dong Xu Sheng-Gui Zhang Department of Logistics and Maritime Studies The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina School of Mathematics and Statistics Qinghai University for NationalitiesXining 810000QinghaiChina Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Computer or communication networks are so designed that they do not easily get disrupted under external attack and,moreover,these are easily reconstructible if they do get *** desirable properties of networks can be measured by various graph parameters,such as connectivity,toughness,scattering number,integrity,tenacity,rupture degree and edge-analogues of some of *** these parameters,the tenacity and rupture degree are two better ones to measure the stability of a *** this paper,we consider two extremal problems on the tenacity of graphs:determine the minimum and maximum tenacity of graphs with given order and *** give a complete solution to the first problem,while for the second one,it turns out that the problem is much more complicated than that of the minimum *** determine the maximum tenacity of trees with given order and show the corresponding extremal *** paper concludes with a discussion of a related problem on the edge vulnerability parameters of graphs.

关键词： Vulnerability parameters Minimum tenacity Maximum tenacity Trees

Substructure Evolution of Ti-6Al-2Zr-1Mo-1V Alloy Isothermally Hot Compressed in α+β Two-Phase Region

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

Acta Metallurgica Sinica(English Letters) 2013年第5期26卷 533-544页

作者： chuan WU He YANG Hongwei li State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University

Substructure evolution significantly influences the flow behavior of titanium alloys in isothermal hot compression. This paper presents a physical experiment（isothermal hot compression and electron backscatter difraction, EBSD） and a cellular automaton（CA） method to investigate the substructure evolution of a near-α titanium alloy Ti-6Al-2Zr-1Mo-1V（TA15） isothermally compressed in the α ＋ β two-phase region. In the CA model, the subgrain growth, the transformation of low angle boundaries（LABs） to high angle boundaries（HABs） and the dislocation density evolution were considered. The dislocation density accumulating around the subgrain boundaries provided a driving force and made the transformation of the LABs to HABs. The CA model was employed to predict the substructure evolution, dislocation density evolution and flow stress. In addition, the efects of strain, strain rate and temperature on the relative frequency of the HABs were analyzed and discussed. To verify the CA model, the predicted results including the relative frequency of the HABs and the flow stress were compared with the experimental values.

关键词： Substructure evolution Cellular automaton modeling Dislocation density evolution EBSD technique

Anticoagulation therapy prevents portal-splenic vein thrombosis after splenectomy with gastroesophageal devascularization

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第26期18卷 3443-3450页

作者： Wei Lai Shi-Chun Lu Guan-yin li chuan-Yun li Ju-Shan Wu Qing-liang Guo Meng-Long Wang Ning li Depart-ment of Hepatobiliary Surgery and You-An liver Transplanta-tion Center Beijing You-An HospitalCapital Medical Univer-sityBeijing 100069China

AIM:To compare the incidence of early portal or splenic vein thrombosis(PSVT) in patients treated with irregular and regular anticoagulantion after splenectomy with gastroesophageal ***:We retrospectively analyzed 301 patients who underwent splenectomy with gastroesophageal devascularization for portal hypertension due to cirrhosis between April 2004 and July *** were categorized into group A with irregular anticoagulation and group B with regular anticoagulation,*** A(153 patients) received anticoagulant monotherapy for an undesignated time period or with aspirin or warfarin without low-molecular-weight heparin(LMWH) *** B(148 patients) received subcutaneous injection of LMWH routinely within the first 5 d after surgery,followed by oral warfarin and aspirin for one month *** target prothrombin time/international normalized ratio(PT/INR) was *** and PT/INR were *** Doppler imaging was performed to monitor PSVT as well as the effectiveness of thrombolytic ***:The patients' data were collected and analyzed *** the patients,94 developed early postoperative mural PSVT,including 63 patients in group A(63/153,41.17%) and 31 patients in group B(31/148,20.94%).There were 50(32.67%) patients in group A and 27(18.24%) in group B with mural PSVT in the main trunk of portal *** the administration of thrombolytic,anticoagulant and antiaggregation therapy,complete or partial thrombus dissolution achieved in 50(79.37%) in group A and 26(83.87%) in group ***:Regular anticoagulation therapy can reduce the incidence of PSVT in patients who undergo splenectomy with gastroesophageal devascularization,and regular anticoagulant therapy is safer and more effective than irregular anticoagulant *** and timely thrombolytic therapy is imperative and feasible for the prevention of PSVT.

关键词： Portal vein hypertension Splenectomy withgastroesophageal devascularization Portal or splenicvein thrombosis Anticoagulation regimen Thrombo-lyric therapy

Total flavonoids of hawthorn leaves promote motor function recovery via inhibition of apoptosis after spinal cord injury

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

Neural Regeneration Research 2021年第2期16卷 350-356页

作者： Qiong Zhang yin Xiong Bo li Gui-ying Deng Wen-Wen Fu Bai-chuan Cao Shao-Hui Zong Gao-Feng Zeng School of Public Health Guangxi Medical University NanningGuangxi Zhuang Autonomous RegionChina Department of Spine Osteopathic Surgery The First Affiliated Hospital of Guangxi Medical UniversityGuangxi Zhuang Autonomous RegionChina Research Center for Regenerative Medicine Guangxi Key Laboratory of Regenerative MedicineGuangxi Medical UniversityNanningGuangxi Zhuang Autonomous RegionChina

Flavonoids have been reported to have therapeutic potential for spinal cord *** leaves have abundant content and species of total flavonoids,and studies of the effects of the total flavonoids of hawthorn leaves on spinal cord injury have not been published in or outside ***,Sprague-Dawley rats were used to establish a spinal cord injury model by Allen's *** were intraperitoneally injected with 0.2 m L of different concentrations of total flavonoids of hawthorn leaves(5,10,and 20 mg/kg)after spinal cord *** were administered once every 6 hours,three times a day,for 14 *** treatment with various concentrations of total flavonoids of hawthorn leaves,the Basso,Beattie,and Bresnahan scores and histological staining indicated decreases in the lesion cavity and number of apoptotic cells of the injured spinal cord tissue;the morphological arrangement of the myelin sheath and nerve cells tended to be regular;and the Nissl bodies in neurons *** Basso,Beattie,and Bresnahan scores of treated spinal cord injury rats were *** blot assays showed that the expression levels of pro-apoptotic Bax and cleaved caspase-3 were decreased,but the expression level of the anti-apoptotic Bcl-2 protein was *** improvement of the above physiological indicators showed a dose-dependent relationship with the concentration of total flavonoids of hawthorn *** above findings confirm that total flavonoids of hawthorn leaves can reduce apoptosis and exert neuroprotective effects to promote the recovery of the motor function of rats with spinal cord *** study was approved by the Ethics Committee of the Guangxi Medical University of China(approval No.201810042)in October 2018.

关键词： apoptosis Bax protein Bcl-2 protein cleaved caspase-3 inflammation motor function recovery neuroprotection Nissl bodies spinal cord injury total flavonoids of hawthorn leaves

Space-Cheirge-limiting Current of a Relativistic Electron Beam Propagating in a Rippled-Wall Waveguide

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第3期17卷 212-214页

作者： QIAN Bao-liang LEI yin-Zhao liU Yong-Gui li chuan-Lu Department of Applied Physics National University of Defense TechnologyChangsha 410073 Center for Electromagnetics Research Zhengzhou University of TechnologyZhengzhou 450002

A Quid model is used to derive the space-charge-limiting current of a relativistic electron beam drifting in a rippled-wall cylindrical *** is found that an enhancement of the space-charge-liniiting current is found as long as optimum values of the ripple wavelength and amplitude are ***,a very small ripple wavelength of the waveguide may reduce the space-charge-limiting current *** result should be of interest to the operation of backward-wave oscillators.

关键词： waveguide Waveguide charge

On the Construction and Representation of Chinese Cultural Identity: From an Intercultural Perspective

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

学术界 2019年第6期 214-224页

作者： li chuan School of Foreign Studies China University of Mining and Technology

Cultural identity is the identity or feeling of belonging to a ***,relational and communal identity are the three components of the cultural *** cultural identity is an example of communal identity.A positive national cultural identity enhances national prestige,increases global understanding,reveals a unique value proposition and develops a competitive advantage in the ***,in the wave of globalization and contemporary Chinese social transformation,Chinese cultural identity encounters some *** identity becomes *** present paper attempts to make some suggestions to the construction and representation of Chinese cultural identity from an intercultural *** construct Chinese cultural identity,we should try to accommodate Chinese cultural inheritance with contemporary culture and modern society,enhance full development of cultural products,rebuild people’s self-esteem on cultural identity,and improve the government’s identity-constructing *** for the representation of Chinese cultural identity,promoting the Chinese language,making use of mass media,performing national cultural identity in sports,encouraging heritage tourism and drawing upon other countries’ experience would be essential.

关键词： cultural identity construction communication intercultural perspective

Consistent response of nematode communities to management of coniferous plantations

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2022年第4期9卷 483-490页

作者： Haifeng yin Yu Su Size liu Xiangjun li Xianwei li chuan Fan Pingting Guan Zhijing Xie Simin Wang Stefan Scheu Valentyna Krashevska College of Forestry Sichuan Agricultural UniversityChengdu611130China J.F.Blumenbach Institute of Zoology and Anthropology University of G€ottingenG€ottingen37073Germany Sichuan Academy of Forestry Chengdu610036China State Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River Sichuan Agricultural UniversityChengdu611130China State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration School of EnvironmentNortheast Normal UniversityChangchun130117China Centre of Biodiversity and Sustainable Land Use University of GottingenGottingen37073Germany

Background:Crop-tree thinning (CTT) is a forest management practice aiming at enhancing the growth of target trees in plantations by harvesting neighboring trees. Along with the positive effect on tree growth, thinning represents a disturbance, which likely affects belowground organisms and may feed back to stand ***, the impact of CTT on the belowground food web is poorly understood. Since nematodes are species-rich and abundant belowground organisms, occupying a variety of trophic positions in soil food webs and being sensitive to disturbances, they serve as ecological indicators of ecosystem ***:We studied the effect of CTT on the soil nematode community structure in pine (Pinus massoniana Lamb.),Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) and cypress (Cupressus funebris Endl.) plantations in the Sichuan Basin three years after applying CTT. Crop-tree thinning significantly increased the abundance of soil nematodes in each of the plantations. Moreover, CTT significantly increased the relative abundance of herbivorous nematodes in each of the plantations. Furthermore, CTT increased the proportion of stress tolerators (c-p 1)and enrichment opportunists (c-p 2) and reduced the maturity, structure and enrichment indices of nematodes in Chinese fir and cypress plantations, while only subtle changes were observed in pine plantations. Interestingly,across plantations, the effects of CTT on soil nematode communities were mainly due to changes in microbial biomass nitrogen and understory vegetation ***:Forest management practices resulting in more open canopies uniformly affect soil food webs by changing the quantity and quality of resources associated with increased understory cover and diversity as well as microbial food. These insights increase our understanding of the impacts of forest management on the structure and functioning of belowground communities, which may contribute to management and conservation po

关键词： Soil nematodes Crop-tree thinning Understory vegetation Forest management Soil fauna

Soft-capacitated Facility Location Game

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2010年第1期26卷 93-98页

作者： Yu li Da-chuan Xu Department of Mathematics School of Science Beijing Jiaotong University Beijing 100044 China Department of Applied Mathematics College of Applied Sciences Beijing University of Technology Beijing 100124 China

We study the soft-capacitated facility location game which is an extension of the facility location game of Pa1 and Tardos. We propose a 6-approximate cross-monotonic cost-sharing method. Numerical tests indicate that... 详细信息

关键词： Facility location game cross-monotonic competitive approximate cost recovery

Surface-to-bulk engineering with high-valence W^(6+) enabling stabilized single-crystal liNi_(0.9)Co_(0.05)Mn_(0.05)O_(2) cathode

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第11期98卷 67-76页

作者： Jun-Ke liu Xue-Rui Yang chuan-Wei Wang Zu-Wei yin Yi-Yang Hu li Deng Zhen Wang Yao Zhou Jun-Tao li College of Energy Xiamen UniversityXiamen 361005FujianChina College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005FujianChina School of Physics and Materials Science Nanchang UniversityNanchang 330031JiangxiChina

Single-crystal Nickel-rich layered oxides has been recognized as one of the promising cathodes for nextgeneration lithium batteries on account of their high capacity,while its practical application was hindered by structural instability and slow li^(+) transfer ***,a surface-to-bulk engineered single-crystal liNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)(Ni90) cathode,which features W-doped bulk and li_(2)WO_(4) surface layer,was successfully achieved by a one-step high-valence W^(6+) *** as-obtained W-modified Ni90 delivers excellent cycling stability(89.8% capacity retention after 300 cycles at 0.5 C)and rate *** enhanced electrochemical performance was ascribed to the doped-W induced stabilized lattice oxygen,reduced li^(+)/Ni^(2+) mixing and inhibited H2-H3 phase transition in the bulk,and li_(2)WO_(4) layer generated stabilized cathode/electrolyte *** addition,the thinner liF-rich cathode electrolyte interphase(CEI) on surface and smaller grain size for W-modified Ni90 benefit to its li^(+) diffusion *** effect of high-valence W^(6+)on single-crystal Ni-rich cathode was firstly revealed in detail,which deepens the understanding of electrochemical behavior of Ni-rich cathode with high-valence cations modification,and provides clues for design of high-performance layered cathodes.

关键词： Single-crystal Ni-rich cathode Surface-to-bulk engineering High-valence cations Structural stability Interfacial side reaction