检索结果-南通市图书馆

Management of post-hepatectomy complications

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第44期19卷 7983-7991页

作者： Shan Jin Quan fu Gerile Wuyun tu Wuyun Department of General Surgery Affiliated Hospital of Inner Mongolia Medical University Department of Clinical Laboratory Affiliated Hospital of Inner Mongolia Medical University

Hepatic resection had an impressive growth over *** has been widely performed for the treatment of various liver diseases,such as malignant tumors,benign tumors,calculi in the intrahepatic ducts,hydatid disease,and *** of hepatic resection is *** technical advances and high experience of liver resection of specialized centers,it is still burdened by relatively high rates of postoperative morbidity and ***,complex resections are being increasingly performed in high risk and older patient *** on the liver is especially challenging because of its unique anatomic architecture and because of its vital *** posthepatectomy complications include venous catheterrelated infection,pleural effusion,incisional infection,pulmonary atelectasis or infection,ascites,subphrenic infection,urinary tract infection,intraperitoneal hemorrhage,gastrointestinal tract bleeding,biliary tract hemorrhage,coagulation disorders,bile leakage,and liver *** problems are closely related to sur-gical manipulations,anesthesia,preoperative evaluation and preparation,and postoperative observation and *** safety profile of hepatectomy probably can be improved if the surgeons and medical staff involved have comprehensive knowledge of the expected complications and expertise in their *** review article focuses on the major postoperative issues after hepatic resection and presents the current management.

关键词： Hepatectomy Postoperative complication Management

Single-Channel Speech Separation Based on Non-negative Matrix Factorization and Factorial Conditional Random Field

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

Chinese Journal of Electronics 2018年第5期27卷 1063-1070页

作者： LI Xu tu Ming WANG Xiaofei WU Chao fu Qiang YAN Yonghong Key Laboratory of Speech Acoustics and Content Understanding Institute of AcousticsChinese Academy of Sciences Signal Analysis Representation and Perception Laboratory Arizona State University Xinjiang Laboratory of Minority Speech and Language Information Processing

A new Non-negative matrix factorization(NMF) based algorithm is proposed for single-channel speech separation with a prior known speakers, which aims to better model the spectral structure and temporal continuity of speech signal. First, NMF and k-means clustering are employed to obtain multiple small dictionaries as well as a state sequence that describes the temporal dynamics between these dictionaries for each ***, a Factorial conditional random field(FCRF) model is trained using the state sequences and dictionaries to jointly model the temporal continuity of two speakers’ mixed signal for separation. Experiments show that the proposed algorithm outperforms the baselines with respect to all metrics, for example sparse NMF(+1.12 dB SDR, +2.37 dB SIR, +0.40 dB SAR, +0.2 MOS), nonnegative factorial hidden Markov model(+2.04 dB SDR,+4.26 dB SIR, +0.62 dB SAR, +1.0 MOS) and standard NMF(+2.8 dB SDR, +5.08 dB SIR, +1.06 dB SAR, +1.2 MOS).

关键词： Single-channel speech separation Non-negative matrix factorization Factorial conditional random field k-means clustering

Effects of urban street trees on human thermal comfort and physiological indices: a case study in Changchun city, China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第3期33卷 911-922页

作者： Zhibin ren Hongbo Zhao Yao fu Lu Xiao Yulin Dong Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun130102P.R.China Key Research Institute of Yellow River Civilization and Sustainable Development&Collaborative Innovation Center On Yellow River Civilization Jointly Built By Henan Province and Ministry of Education Henan UniversityKaifeng475001P.R.China School of Geography and Engineering of Land Resources Yuxi Normal UniversityYuxi653100P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China

Planting trees along urban streets is one of the most important strategies to improve the urban thermal ***,the net impacts of urban street trees on human thermal comfort and physiological parameters are still less *** three similar east-west orientated streets with different degrees of tree cover-low(13%),medium(35%),and high(75%),urban microclimatic parameters and human physiological indices for six male students were simultaneously measured on three cloudless days in summer *** results show that the differences in tree cover were predominant in influencing urban thermal environment and *** street with the highest tree cover had significantly lower physiological equivalent temperature(PET) and more comfortable than the other two *** frequency of strong heat stress(PET> 35℃) was 64%,11 %,and 0%,respectively,for streets with low,medium,and high tree *** the six male university students,human physiological indices varied greatly across the three streets with different tree *** blood pressure,diastolic blood pressure,and pulse rate increased with decreasing tree *** results also suggest that urban thermal environment and comfort had considerable impact on human physiological *** study provides reasons for urban planners to plant trees along streets to improve the thermal environment and promote urban sustainability.

关键词： Urban forest Green space Environmental ecosystem services Urban thermal comfort Blood pressure Pulse rate

Intensified shape selectivity and alkylation reaction for the two-step conversion of methanol aromatization to p-xylene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第7期59卷 240-250页

作者： Tingjun fu Ran Wang Kun ren Liangliang Zhang Zhong Li State Key Laboratory of Clean and Efficient Coal Utilization College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China

Two-step conversion of methanol to aromatics via light hydrocarbons can significantly improve the conversion stability compared with direct aromatization of methanol,but it remains a challenge to achieve a high p-xylene(PX)***,silica coating was firstly used to passivate external acid sites of ZSM-5 catalyst for the aromatization of light hydrocarbons by the chemical liquid deposition *** the increase of SiO_(2) deposition,the density of the external acid sites of the catalyst was decreased from 0.1 to 0.03 mmol·g^(-1),which inhibited the surface secondary reactions and increased the PX/X from 34.6% to 60.0%.In view of the fact that the aromatization process in the second step was partly inhibited as methanol was consumed in advance in the upper methanol-to-light hydrocarbons catalyst layer,part of methanol was directly introduced into the lower aromatization catalyst layer to promote the alkylation process during the aromatization,which decreased the toluene selectivity from 34.5% to 14.3% but increased the xylene selectivity from 40.0%to 55.3%.It was also found that an appropriate external acid density was needed for aromatization catalyst to strengthen the alkylation process and improve the selectivity of xylene under the conditions of methanol introduction.

关键词： Methanol to aromatics Two-step conversion Para-xylene Zeolite Silica Catalysis

Phase selection and solidification path transition of Ti-48Al-xNb alloys with different cooling rates

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第1期42卷 288-295页

作者： Tan He Rui Hu Jie-ren Yang Heng-Zhi fu The State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China

Ti-48Al-xNb alloys were solidified by containerless electromagnetic levitation with quenching system of the conical copper *** influence of cooling rates on phase selection of T1-48Al-xNb alloys was *** near-equilibrium solidification condition,the dendrite βphase is observed as the leading *** other metastable phase(e.g.,α phase) is *** contrast,in rapid solidification condition,the metastable α phase is observed in as-quenched Ti-48Al-2Nb ***,the metastable α phase is replaced by the primary β phase with Nb addition *** Ti-48Al-(x=4,6,8)Nb alloys,increasing cooling rate results in a solidification path *** peritectic reaction(L+β→α) is therefore significantly *** relationships between primary dendrite arm spacing(λ_(1)) and cooling rate(τ) can be described.

关键词： TiAl alloy Cooling rate Microstructure Phase selection

Semisolid die forging process,microstructures and properties of AZ31 magnesium alloy mobile telephone shells

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 665-670页

作者： ren-guo Guan Li-qing Chen fu-rong Cao Zhan-yong Zhao Yong ren College of Materials and Metallurgy Northeastern University Shenyang 110004 China State Key Lab of Rolling and Automation Northeastern University Shenyang 110004 China

A semisolid slurry of AZ31 magnesium alloy was prepared by vibrating wavelike sloping plate process,and the semisolid die forging process,microstructures,and properties of the magnesium alloy mobile telephone shell were *** semisolid forging process was performed on a YA32-315 four-column universal hydraulic *** microstructures were observed by optical microscopy,the hardness was analyzed with a model 450SVD Vickers hardometer,the mechanical properties was measured with a CMT5105 tensile test machine,and the fractograph of elongated specimens was observed by scanning electron microscopy （SEM）.The results reveal that with the increase of die forging force,the microstructures of the product become fine and dense.A lower preheating temperature and a longer dwell time are favorable to the formation of fine and dense *** optimum process conditions of preparing mobile telephone shells with excellent surface quality and microstructures are a die forging force of 2000 kN,a die preheating temperature of 250℃,and a dwell time of 240 *** solution treatment at 430℃ and aging at 220℃ for 8 h,the Vickers hardness is 61.7 and the ultimate tensile strength of the product is *** fractographs show the mixing mechanisms of quasi-cleavage fracture and ductile fracture.

关键词： magnesium alloys semisolid forging microstructure mechanical properties fracture

Prediction of column failure modes based on artificial neural network

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2023年第2期22卷 481-493页

作者： Wan Haitao Qi Yongle Zhao Tiejun ren Wenjuan fu Xiaoyan School of Civil Engineering and Architecture Henan UniversityKaifeng 475001China China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd.Guangzhou 510663China

To implement the performance-based seismic design of engineered structures,the failure modes of members must be *** classification method of column failure modes is analyzed using data from the Pacific Earthquake Engineering Research Center(PEER).The main factors affecting failure modes of columns include the hoop ratios,longitudinal reinforcement ratios,ratios of transverse reinforcement spacing to section depth,aspect ratios,axial compression ratios,and flexure-shear *** study proposes a data-driven prediction model based on an artificial neural network(ANN)to identify the column failure *** this study,111 groups of data are used,out of which 89 are used as training data and 22 are used as test data,and the ANN prediction model of failure modes is *** results show that the proposed method based on ANN is superior to traditional methods in identifying the column failure modes.

关键词： performance-based seismic design failure mode column artificial neural network prediction model

Degradation behaviors of Nabumetone and its metabolite during UV/monochloramine process:Experimental and theoretical study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第8期142卷 103-114页

作者： Xiang tu Yunsong Bai Qing fu Sheng Chang Kunfeng Zhang Yang Pan Ruiyang Xiao Yifu fu Qi Zhang State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Drinking Water Source ProtectionResearch Centre of Lake EnvironmentNational Engineering Laboratory for Lake Pollution Control and Ecological RestorationChinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Institute of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China School of Forestry Northeast Forestry UniversityHarbin 150040China

This study investigated degradation behaviors of a nonsteroidal anti-inflammatory drug Nabumetone(NMT)and its major metabolite 6-methoxy-2-naphthylacetic acid(MNA)in the coupling process of ultraviolet and monochloramine(UV/NH2Cl).The second-order rate constants of the contaminants reacting with reactive radicals(HO·,Cl·,Cl_(2)·-,and CO_(3)·^(-))were determined by laser flash photolysis ***·and Cl·contributed predominantly with 52.3%and 21.7%for NMT degradation and 60.8%and 22.3%for MNA *** presence of chlorides retarded the degradation of NMT,while promoted the destruction of MNA,which was ascribed to the photosensitization effects of MNA under UV *** functional theory(DFT)calculations revealed that radical adduct formation(RAF)was dominant pathway for both HO·and Cl·reacting with the contaminants,and hydrogen atom transfer(HAT)preferred to occur on side chains of NMT and *** reacted with NO_(2)·through single electron transfer(SET)with the second-order rate constant calculated to be 5.35×10^(7)(mol/L)^(-1)sec^(-1),and the contribution of NO_(2)·was predicted to be 13.0%of the total rate constant of NMT in pure water,which indicated that NO_(2)·played a nonnegligible role in the degradation of *** acute toxicity and developmental toxicity of NMT were enhanced after UV/NH_(2)Cl treatment,while those of MNA were *** transformation products of both NMT and MNA exhibited higher mutagenicity than their parent *** study provides a deep understanding of the mechanism of radical degradation of NMT and MNA in the treatment of UV/NH2Cl.

关键词： UV/NH_(2)Cl Reactive species Degradation kinetics Reaction mechanism Degradation products

Facile Synthesis of SnO_2 Nanotube Arrays by Using ZnO Nanorod Arrays as Sacrificial Templates

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第11期29卷 1053-1058页

作者： Yafang tu Qiuming fu Xiaojuan Niu Jianping Sang Zhijie Tan Xianwu Zou Department of Physics Institute for Interdisciplinary ResearchJianghan University School of Materials Science and Engineering Wuhan Institute of Technology Department of Physics Wuhan University

SnO2 nanotube arrays have been synthesized by means of a simple and low-cost method. The ZnO nanorod arrays prepared by aqueous chemical growth method were used as templates. By liquid phase deposition, SnO2 nanotubes were obtained with proper deposition time. Scanning electron microscopy, transmission electron microscopy and X-ray diffraction were used to characterize the morphologies and structures of the products, and the formation mechanism was discussed according to the experimental results.

关键词： Nanostructure Zinc oxide Tin oxide