检索结果-南通市图书馆

Nuclear Science and Techniques 2018年第4期29卷 57-65页

作者： Xiao-Long Lu yu Zhang Jun-Run Wang Zhi-Wu Huang Zhan-Wen ma Yao Yang Ze-En Yao School of Nuclear Science and Technology Lanzhou University Engineering Research Center for Neutron Application Ministry of Education Lanzhou University Institute of Modern Physics Chinese Academy of Sciences

The transport characteristics of a space chargedominated multi-species deuterium beam consisting of D_1^+,D_2^+, and D_3^+ particles in an electrostatic low-energy beam line are studied. First, the envelope equations of the primary D_1^+ beam are derived considering the space charge effects caused by all particles. Second, the evolution of the envelope of the multi-species deuterium beam is simulated using the PIC code TRACK, with the results showing a significant effect of the unwanted beam on the transport of the primary beam. Finally, different injected beam parameters are used to study beam matching, and a new beam extraction system for the existing duoplasmatron source is designed to obtain the ideal injected beam parameters that allow a D_1^+ beam of up to 50 m A to pass unobstructed through the electrostatic low-energy beam transport line in the presence of an unwanted(D_2^+, D_3^+)beam of 20 m A; at the same time, distortions of the beam emittance and particle distributions are observed.

关键词： Envelope equation Space charge effects Multi-species beam Electrostatic LEBT

PNb_(9)O_(25) nanofiber as a high-voltage anode material for advanced lithium ions batteries

在线全文

学校读者我要写书评

暂无评论

Journal of materiomics 2020年第4期6卷 781-787页

作者： Haoxiang yu Jundong Zhang maoting Xia Chenchen Deng Xikun Zhang Runtian Zheng Shi Chen Jie Shu Zhen-bo Wang MIIT Key Laboratory of Critical materials Technology for New Energy Conversion and Storage State Key Lab of Urban Water Resource and EnvironmentSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyNo.92 West-Da Zhi StreetHarbin150001Heilongjiang ProvinceChina Faculty of materials Science and Chemical Engineering Ningbo UniversityNo.818 Fenghua RoadNingbo315211Zhejiang ProvinceChina Key Laboratory of Advanced Energy materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin300071China

If the operating voltage of anode materials is below 1.0 V versus Lit/Li,the side reaction between electrolyte and anode materials will occur ***,high-voltage anode materials have aroused interest *** this work,we report the preparation of PNb9O25 nanofiber via a facile electrospinning *** PNb9O25 nanofiber shows the high rate performance and excellent cycling performance when it is used as anode in lithium ions *** instance,the PNb9O25 nanofiber can deliver a capacity of 233,212.1,193.8,and 181.4 ma h g^(-1) at 0.2,1,3,and 6C,*** 1000 cycles,it can reach at 134.3 ma h g^(-1) with capacity retention of 70.9%.Meanwhile,the ex situ X-ray photoelectron spectroscopy technique has been adopted to investigate the evolution in valence state of each element for PNb9O25 *** addition,the PNb9O25 nanofiber is chosen as the anode material in lithium ion full cell in this work,demonstrating the potential for practical application.

关键词： PNb9O25 Nanofiber Electrospinning Anode Lithium ion batteries

A versatile cooperative template-directed coating method to synthesize hollow and yolk-shell mesoporous zirconium titanium oxide nanospheres as catalytic reactors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2014年第2期7卷 246-262页

作者： Buyuan Guan Tao Wang Shangjing Zeng Xue Wang Dong An Dongmei Wang yu Cao Dingxuan ma yunling Liu Qisheng Huo State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry 2ilin University Changchun China

The design of hollow mesoporous nanostructures for cascade catalytic reactions can inject new vitality into the development of nanostructures. In this study, we report a versatile cooperative template-directed coating method for the synthesis of hollow and yolk-shell mesoporous zirconium titanium oxide nanospheres with varying compositions （ZrO2 content from 0 to 100%）, high surface areas （465 m2·g-1） and uniform mesopores. In particular, the hexadecylamine （HDA） used in the coating procedure serves as a soft template for silica@mesostructured metal oxide core-shell nanosphere formation. By a facile solvothermal treatment route with an ammonia solution and calcination in air, the silica@mesostructured zirconium titanium oxide spheres can be converted into highly uniform hollow zirconium titanium oxide spheres. By simply replacing hard template silica nanospheres with core-shell silica nanocomposites, the synthesis approach can be further used to prepare yolk-shell mesoporous structures through the coating and etching process. The approach is similar to the preparation of mesoporous silica nanocomposites from the self-assembly of the core, the soft template cetyltrimethylammonium bromide （CTAB） and a silica precursor and can be extended as a general method to coat mesoporous zirconium titanium oxide on other commonly used hard templates （e.g., mesoporous silica spheres, mesoporous organosilica ellipsoids, polymer spheres, and carbon nanospheres）. The presence of highly permeable mesoporous channels in the zirconium titanium oxide shells has been demonstrated by the reduction of 4-nitrophenol with yolk-shell Au@mesoporous zirconium titanium oxide as the catalyst. Moreover, a cascade catalytic reaction including an acid catalyzed step and a catalytic hydrogenation to afford benzimidazole derivatives can be carried out very effectively by using the accessible acidity of the yolk-shell structured mesoporous zirconium titanium oxide spheres containing a Pd core as a bifun

关键词： hollow structure yolk-shell structure mesoporous zirconiumtitanium oxide self-assembly multiple catalyst

Energy and protein requirements for maintenance of Hu sheep during pregnancy

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 Integrative Agriculture 2018年第1期17卷 173-183页

作者： ZHANG Hao SUN Ling-wei WANG Zi-yu ma Tie-wei DENG Ming-tian WANG Feng ZHANG Yan-li Jiangsu Engineering Technology Research Center of Mutton Sheep & Goat Industry Nanjing Agricultural University Laboratory of Metabolic manipulation of Herbivorous Animal Nutrition College of Animal Science and TechnologyYangzhou University Joint International Research Laboratory of Agriculture & Agri-product Safety Yangzhou University

This study aimed to determine the effect of stage and level of feed intake on energy metabolism, carbon-nitrogen （C-N） balance, and methane emission to determine energy and protein requirements for maintenance of maternal body including pregnancy tissues during pregnancy using the method of C-N balance. Twenty-one ewes carrying twin fetuses were randomly divided into three groups of seven ewes each in the digestion and respirometry trial at d 40, 100, and 130 of gestation, respectively. Three groups were fed a mixed diet either for ad lib#urn intake, 70 or 50% of the ad libfum intake during pregnancy. The results showed that the apparent digestibility of C and N were increased as feeding levels decreased at each stage of gestation. The daily net energy requirements for maintenance （NEro） were 295.80, 310.09, and 323.59 kJ kg-1 BW0.75 （metabolic body weight） with a partial efficiency of metabolisable energy utilization for maintenance of 0.664, 0.644, and 0.620 at d 40, 100, and 130 of gestation, respectively. The daily net protein requirements for maintenance were 1.99, 2.35, and 2.99 g kg-1 BW0.75 at d 40, 100, and 130 of gestation, respectively. These results for the nutritional requirements of the net energy and protein may help to formulate more balanced diets for Hu sheep during pregnancy.

关键词： carbon and nitrogen balance energy methane emission protein pregnancy

Gastrointestinal bleeding caused by jejunal angiosarcoma: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第19期8卷 4565-4571页

作者： Yang-Yang Hui Lan-Ping Zhu bo Yang Zi-yue Zhang yu-Jie Zhang Xin Chen Bang-mao Wang Department of Gastroenterology and Hepatology Tianjin Medical University General HospitalTianjin 300052China Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjin 300072China Department of Pathology Tianjin Medical University General HospitalTianjin 300052China

BACKGROUND Angiosarcoma is a rare disease with a poor *** occurrence in the small intestine is low,and gastrointestinal bleeding caused by small intestinal angiosarcoma is *** SUMmaRY Here,we report the case of a 57-year-old man who presented with hematochezia for 1 *** patient had a medical history of chronic viral hepatitis B for 15 *** causes of gastrointestinal bleeding were initially diagnosed as esophagogastric variceal bleeding or portal hypertensive gastropathy before ***,after a complicated diagnostic and therapeutic process,including gastroendoscopy,colonoscopy,contrast-enhanced computed tomographic(CT),positron emission computed tomography/CT,capsule endoscopy,and pathological and immunohistochemical examinations,small intestinal angiosarcoma was *** of bleeding was achieved after surgical ***,the patient had lung cancer with bone and adrenal *** the follow-up 10 mo after the operation,the patient was *** Gastroenterologists should maintain strong vigilance to small intestinal angiosarcoma,which is necessary for the early identification of this infrequent but fatal disease.

关键词： Small intestine Angiosarcoma Gastrointestinal bleeding Case report Diagnosis Prognosis

Spatial Reconstruction of Rural Settlements in Central China

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 Landscape Research 2018年第5期10卷 9-11,21页

作者： BAO Rui yu bo Wuhan University of Technology WuhanHubei 430000China

By analyzing the construction status of the rural settlement in Central China,it points out that spatial patterns of the rural residential areas always have some problems such as small scale,dispersive layout,hollowness of village,and shortage of *** on the idea of urban-rural interaction,industry complementarity and organic function,the rural settlement should be reconstructed in the patterns of harmony with city and town,merging center village,ecological migration,and interior reforms.

关键词： Central China New countryside construction Rural settlement Space reconstruction

Discovery of a novel 112-type iron-pnictide and La-doping induced superconductivity in Eu_(1-x)La_xFeAs_2(x=0–0.15)

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 Bulletin 2017年第3期62卷 218-221页

作者： Jia yu Tong Liu bo-Jin Pan Bin-Bin Ruan Xiao-Chuan Wang Qing-Ge Mu Kang Zhao Gen-Fu Chen Zhi-An Ren Institute of Physics and Beijing National Laboratory for Condensed matter Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum matter Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100039 China

We report the discovery and characterization of a novel 112-type iron pnictide EuFeAs2, with La-doping induced superconductivity in a series of Eu1- xLaxFeAs2. The polycrystalline samples were synthesized through solid state reaction method only within a very narrow temperature window around 1073 K. Small single crystals were also grown from a flux method with the size about 100μm. The crystal structure was identified by single crystal X-ray diffraction analysis as a monoclinic structure with space group of P2 1/m. From resistivity and magnetic susceptibility measurements, we found that the parent compound EuFeAs2 shows distinct anomalies probably due to the Fe2＋ related antiferromagnetic/structural phase transition near 110K and the Eu2＋ related antiferromagnetic phase transition near 40K. La-doping suppressed both phase transitions to lower temperatures and induced superconducting transitions with a Tc - 11 K for Eu0.85La0.15FeAs2.

关键词： EuFeAs2 Superconductivity La-doping Antiferromagnetic transition

Design of large aperture 500 MHz 5-cell superconducting cavity

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2012年第5期23卷 257-260页

作者： WEI Yelong LIU Jianfei HOU Hongtao ma Zhenyu maO Dongqing FENG Ziqiang LU Changwang yu Haibo Shanghai Institute of Applied Physics Chinese Academy of Sciences Jiading Campus Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology Shanghai 201800 China

With the potential application of Energy Recovery Linac (ERL), the superconducting (SC) cavities were developed to deliver much higher current than before. Nowadays, the current of the international SC accelerator designed has already exceeded 100 ma. This paper presents the design of a new 500 MHz 5-cell SC cavity (SINAP 5-cell cavity), in which the parameters r/Q= 515.5 of the fundamental mode and the geometry factor G=275.8 are under an acceptable Radio Frequency (RF) field level (B peak /E acc =4.31 mT/MV/m and E peak /E acc =2.48). This design employs a larger beam pipe to propagate the Higher Order Modes (HOMs) out of the cavity and increases the damping efficiently for the dangerous HOMs. By simulation technique, it has been found that almost all the dangerous HOMs (including TE 111 , TM 110 , and TM 011 ) can be propagated into the beam pipe and are absorbed by ferrite absorbers, when the beam pile is enlarged. Finally, the loss factor for the new 5-cell cavity is also calculated.

关键词：超导腔设计直线加速器光圈无线电频率能量回收几何因子模拟技术

Oral administration microrobots for drug delivery

在线全文

学校读者我要写书评

暂无评论

Bioactive materials 2024年第9期39卷 163-190页

作者： An Ren Jiarui Hu Changwei Qin Neng Xia Mengfei yu Xiaobin Xu Huayong Yang Min Han Li Zhang Liang ma State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China School of Mechanical Engineering Zhejiang UniversityHangzhou 310058China Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatin NTHong Kong SARChina The Affiliated Stomatologic Hospital School of MedicineZhejiang UniversityHangzhou 310003China Key Laboratory of Advanced Civil Engineering materials of Ministry of Education Key Laboratory of D&A for Metal-Functional MaterialsSchool of Materials Science&EngineeringTongji UniversityShanghai201804 China Institute of Pharmaceutics Zhejiang Province Key Laboratory of Anti-Cancer Drug ResearchCollege of Pharmaceutical SciencesZhejiang UniversityHangzhou310058China

Oral administration is the most simple, noninvasive, convenient treatment. With the increasing demands on thetargeted drug delivery, the traditional oral treatment now is facing some challenges: 1) biologics how toimplement the oral treatment and ensure the bioavailability is not lower than the subcutaneous injections;2)How to achieve targeted therapy of some drugs in the gastrointestinal tract? Based on these two issues, drugdelivery microrobots have shown great application prospect in oral drug delivery due to their characteristics offlexible locomotion or driven ability. Therefore, this paper summarizes various drug delivery microrobotsdeveloped in recent years and divides them into four categories according to different driving modes: magneticcontrolleddrug delivery microrobots, anchored drug delivery microrobots, self-propelled drug delivery microrobotsand biohybrid drug delivery microrobots. As oral drug delivery microrobots involve disciplines such asmaterials science, mechanical engineering, medicine, and control systems, this paper begins by introducing thegastrointestinal barriers that oral drug delivery must overcome. Subsequently, it provides an overview of typicalmaterials involved in the design process of oral drug delivery microrobots. To enhance readers’ understanding ofthe working principles and design process of oral drug delivery microrobots, we present a guideline for designingsuch microrobots. Furthermore, the current development status of various types of oral drug delivery microrobotsis reviewed, summarizing their respective advantages and limitations. Finally, considering the significantconcerns regarding safety and clinical translation, we discuss the challenges and prospections of clinical translationfor various oral drug delivery microrobots presented in this paper, providing corresponding suggestions foraddressing some existing challenges.

关键词： Microrobots Gastrointestinal tract Oral administration Drug delivery Biologics

Study on the Consolidation Potential of Construction Land in Bagongshan District of Huainan City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Agricultural Research 2014年第4期6卷 54-56,66页

作者： bo LIU Zhongxiang yu College of Economics and management Anhui Agricultural University Institute of Land and Resources Anhui Agricultural University

Based on grading of consolidation potential of rural construction land,coal mining subsidence areas,old towns and " villages within the city" in Bagongshan District,this article put forwards the following recommendations to fully tap the consolidation potential of construction land in Bagongshan District:strengthening the planning guidance;combining the construction land consolidation with beautiful countryside construction;focusing on the ecological civilization construction.

关键词： Bagongshan District Construction land Consolidatio