检索结果-南通市图书馆

同方期刊数据库博看期刊

Feasibility and efficacy of laparoscopic radical right hemicolectomy with complete mesocolic excision using an‘artery-first’approach

在线全文

学校读者我要写书评

暂无评论

Gastroenterology Report 2019年第3期7卷 199-204,I0002页

作者： Xiao-Jiang Yi Xin-Quan Lu Hong-ming Li Wei Wang Wen-jun Xiong Jin Wan De-Chang diao Department of Gastrointestinal(Tumor)Surgery Guangdong Province Hospital of Chinese MedicineThe Second Affiliated Hospital of Guangzhou University of Chinese MedicineNo.111Dade RoadYuexiuGuangzhouGuangdong 86/510120China

Background:According to previous guidelines,the lymph nodes around the right side of the superior mesenteric artery(SMA)should be dissected and removed en ***,due to the technical challenge and the risk of complications,most surgeons perform the dissection along the axis of the superior mesenteric vein(SMV).Herein,we described an‘artery-first’approach for laparoscopic radical extended right hemicolectomy with complete mesocolic excision(CME).Methods:A total of 22 cases were collected from January to October *** right side of the SMA and SMV were exposed and separated,and the No.203,No.213 and No.223 lymph nodes were dissected en ***’s fascia was dissected and expanded laterally to the ascending colon,cranial to the pancreas *** caudal root of the mesentery and lateral attachments of the ascending colon were completely ***:There were 9 male and 13 female patients,with a mean age of 63.1(range,39–83)years and the mean body mass index was 24.6(range,18.3–37.7)kg/m^(2).The mean operative time was 192.5(range,145–240)minutes and the mean intraoperative blood loss was 55.0(range,10–300)*** mean number of harvested lymph nodes was 27.0(range,13–55)and the time to flatus and hospital stay were 35.0(range,26–120)hours and 7.5(range,5–20)days,*** complications occurred in two patients and no post-operative death was ***:The preliminary results suggest that the reported approach may be a feasible and safe procedure that is more in accordance with the principles of CME.

关键词： Laparoscopic right hemicolectomy complete mesocolic excision ‘artery-first’approach

Weaning methods affect ruminal methanogenic archaea composition and diversity in Holstein calves

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 Integrative Agriculture 2019年第5期18卷 1080-1092页

作者： DONG Li-feng MA jun-nan TU Yan diao Qi-yu Feed Research Institute Chinese Academy of Agricultural Sciences/Beijing Key Laboratory for Dairy Cow Nutrition/Key Laboratory of Feed Biotechnology Ministry of Agriculture

The objective of the present study was to examine the effect of different weaning methods on the ruminal methanogenic archaea composition and diversity in Holstein ***-six newborn Holstein bull calves were assigned to 1 of 3 treatments:(1)conventional weaning(d 56)and fed a high proportion of solid feed(CWS);(2)conventional weaning(d 56)and fed a high proportion of liquid feed(CWL);(3)early weaning(d 42)and fed with a high proportion of solid feed(EWS).High-throughput sequencing of the methyl coenzyme M reductase(mcr A)gene,which encodes theα-subunit of methyl coenzyme M reductase-the enzyme that catalyzes the final step in methanogenesis was used to determine the composition and diversity of rumen *** significant difference(P>0.05)was observed for operational taxonomic units(OTUs)or richness indices,but diversity indices increased(P<0.05)for calves fed high dietary *** families across the three treatments were Methanobacteriaceae,Thermoplasmataceae and *** in the EWS treatment had a higher(P<0.05)relative abundance of Methanobrevibacter *** AbM4 and Methanosphaera stadtmanae,while calves in the CWL treatment had a higher(P<0.05)abundance of Methanosphaera *** SM9.A positive(P<0.05)relationship was identified between butyrate and Methanobrevibacter *** *** conclusion,the composition and diversity of methanogens in the rumen of Holstein calves varied under the different weaning *** study identified a positive relationship between butyrate and Methanobrevibacter *** AbM4,potentially reflecting correlations between ruminal fermentation variables and methanogenesis *** in-depth analyses provide further understanding of weaning methods for intensified production systems.

关键词： calf methyl coenzyme M reductase(mcrA)gene methanogenic archaea diversity rumen fermentation weaning methods

Investigation on UV-curing Reprocessable Thermosets Bearing Hindered Urea Bonds and Their Composites with Modified Zinc Oxide Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 751-765页

作者： jun-Hao Zhou Li-ming Tang Key Laboratory of Advanced Materials of Ministry of Education of China Department of Chemical EngineeringTsinghua UniversityBeijing100084China

In this study,a series of hindered urea bond(HUB)containing polyurethane-urea methacrylate prepolymers and a none HUB containing polyurethane methacrylate prepolymer were prepared using isobornyl methacrylate as the reactive diluent via one-pot *** prepolymers were characterized fully by various ***,their thermosets were fabricated via UV curing in presence of a photo initiator,and their mechanical property and thermal behavior were investigated and *** from the none HUB containing thermoset,the HUB containing thermosets(defined as PUT)could be recycled and reprocessed by hot press under relatively mild conditions with high recovery ratio of mechanical ***,zinc oxide(ZnO)nanoparticles were modified with 3-(trimethoxysilyl)propyl methacrylate and the modified ZnO(defined as ZnO-TPM)was dispersed and polymerized into PUT matrix to prepare their *** influence of ZnO-TPM on the mechanical performance of the composites was evaluated,which indicated that the Young’s modulus and tensile strength increased gradually to the maximum values at ZnO-TPM content of 1 wt%and then *** composites also displayed good reprocessability with improved recovery ratio compared to the pure PUT *** addition,the composite materials exhibited strong UV absorption capacity,implying their potential application in the circumstance where UV-shielding was required.

关键词： Polyurethane-urea methacrylate Hindered urea bond ZnO nanoparticles Reprocessing UV curing

Influence of Constraint in Parameter Space on Quantum Games

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第4期41卷 541-546页

作者： ZHAOHai-jun FANGXi-ming DepartmentofPhysics HunanNormalUniversityChangsha410081China

We study the influence of the constraint in the parameter space on quantum *** SU(2)operator into product of three rotation operators and controlling one kind of them,we impose a constraint on the parameter space of the players' *** find that the constraint can provide a tuner to make the bilateral payoffs equal,so that the mismatch of the players' action at multi-equilibrium could be *** also find that the game exhibits an intriguing structure as a function of the parameter of the controlled operators,which is useful for making game models.

关键词： quantum games operation space constraint

Improved patch antenna performance by using a metamaterial cover

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 192-196页

作者： ZHU Fang-ming HU jun Department of Electrical Engineering Hangzhou Teachers College Hangzhou 310036 China Center for Optical and Electromagnettc Research Zhejiang University Hangzhou 310027 China

A new patch antenna system with a metamaterial cover is presented in this paper. The impedance, radiation pattem, and directivity of such an antenna are studied. A performance comparison between the conventional patch antenna and the new metamaterial patch antenna is given. The results show that the directivity of the metamaterial patch antenna is significantly improved. The effect of the metamaterial cover＇s layer numbers on the radiation pattern of the patch antenna is also studied.

关键词： Directivity Metamaterial Patch antenna

Bondage number of mesh networks

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2012年第5期7卷 813-826页

作者： Futao HU jun-ming XU School of Mathematical Sciences University of Science and Technology of China Wentsun Wu Key Laboratory of Chinese Academy of Sciences Hefei 230026 China

The bondage number b（G） of number of edges whose removal from G number greater than that of G. Denote a nonempty graph G is the smallest results in a graph with domination Pn × Pm the Cartesian product of two paths Pn and Pm. This paper determines the exact values of b（Pn × P2）, b（Pn × P3）, and b（Pn × P4） for n ≥ 2.

关键词： Bondage number dominating set domination number mesh network

ESTIMATION OF WATER TABLE ELEVATION BY UNIVERSAL COKRIGING

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 Hydrodynamics 2005年第2期17卷 154-163页

作者： CHENJia-jun TIANKai-ming GUOQiao-yu StateKeyJointLaboratoryofEnvironmentalSimulationandPollutionControl InstituteofEnvironmentalSciencesBeijingNormalUniversityBeijing100875China ChinaUniversityofGeosciences Beijing100083China StateKeyJointLaboratoryofEnvironmentalSimulationandPollutionControl.InstituteofEnvironmentalSciences BeijingNormalUniversityBeijing100875China

When water resource or quality problems associated with phreatic water in geological settings are studied, information about water table elevations is often crucial. In those cases where the water table is a subdued replica of the ground surface, universal cokriging can be used to estimate water table elevations at un-sampled locations on the basis of water table and ground surface elevation measurements obtained at well locations. In this paper, universal cokriging, with ground surface elevation considered as a co-variate, was used to estimate water table elevations. Universal cokriging equations were derived, an iterative method for obtaining experimental variograms was established, and a case study of an initial groundwater flow simulation in the Xiuwu County, Henan Province, China, was presented. In the case study, the initial groundwater flow regime was represented both by universal cokriging with the ground surface elevation serving as a covariate and by universal kriging without the inclusion of ground surface elevation as a covariate. A comparison of the results from these two approaches shows that groundwater levels of phreatic water at locations without measurements in regions with unconsolidated porous media can be estimated more accurately by universal cokriging.

关键词： water table estimation universal cokriging covariate ground surface elevation variogram

Solution of a Green's function for a saturated porous medium in a half-space subjected to a torsional force

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2012年第1期11卷 133-138页

作者： Ding Boyang Chen jun Ouyang ming College of Civil Engineering and Architecture Zhejiang University of TechnologyHangzhou 310014China

Based on the solutions of the Green＇s function for a saturated porous medium obtained by the authors, and using transformation of axisymmetric coordinates, Sommerfeld integrals and superposition of the influence field on a free surface, the authors have obtained displacement solutions of a saturated porous medium subjected to a torsional force in a half-space. The relationship curves of the displacement solutions and various parameters （permeability, frequency, etc.） under action of a unit of torque are also given in this paper. The results are consistent with previous Reissner＇s solutions, where a two-phase medium decays to a single-phase medium. The solution is useful in solving relevant dynamic problems of a two- phase saturated medium in engineering.

关键词： torsional force saturated porous medium Green's function half-space Sommerfeld integrals

Research on assessment method of intrasystem and intersystem of the global navigation satellite system

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第10期58卷 1672-1681页

作者： ZHANG Jianjun XUE ming XIE jun China Academy of Space Technology Qian Xuesen Laboratory of Space Technology

The global navigation satellite system(GNSS) has become an important space infrastructure. Following GPS and GLONASS, Europe and China have been building their own global navigation satellite system, respectively, GALILEO and Compass. In order to consolidate the leadership of GPS in the globe, United States is gradually upgrading the traditional GPS. Simultaneously, Russia is also intensively restoring full performance of GLONASS. With the advancement of international satellite navigation system, satellite navigation frequency resources are already in short supply, and the design and use of the navigation signals are more sophisticated and complex due to commercial, disaster relief and other reasons. Since there may be many navigation signals in the same basic bandwidth, the coexistence of multiple systems and the combined application make intersystem mutual interference become the focus research. Under this background, the satellite navigation system mutual interference evaluation system needs to be established urgently to meet and support the compatibility and interoperability of the GNSS system. In the paper, through the performance analysis of the GNSS signal acquisition, carrier tracking, data demodulation and code tracking, the equivalent carrier to noise ratio model based on spectrum isolation coefficient is established, and the theoretical system of the GNSS signal mutual interference is proposed according to the mechanism, and the mutual interference of GPS, GALILEO and Compass system is analyzed and assessed.

关键词： GNSS intrasystem interference intersystem interference equivalent carrier to noise ratio