检索结果-南通市图书馆

HYDRAULIC CHARACTERISTICS OF PLUG ENERGY DISSIPATER IN FLOOD DISCHARGE TUNNEL

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 2009年第6期21卷 799-806页

作者： TIAN Zhong xu wei-Lin WANG wei LIU Shan-Jun State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065 China

The hydraulic characteristics of three types of plugs, namely, the single plug, the stepped plug and the gradually contracted plug were studied by means of experimental and numerical simulations. Main research findings are as follows. For the single plug, the pressure recovery lengths inside and after the plug range from 0.63-1.05 times and 2.02-2.84 times of the tunnel diameter, respectively. For the stepped plug, the lengths are 0.24-0.32 times and 1.62-2.84 times of the tunnel diameter, respectively. The best ratio of the inlet diameter to the outlet diameter of the gradually contracted plug can be expressed by a linear function. The relationship between the head loss coefficient and the area contraction ratio is obtained. The incipient cavitation numbers of different plugs are experimentally and numerically determined, and the incipient cavitation numbers are expressed by a formula. Model experiment with scale of 1：50 was carried out on a pressure tunnel with three-stage gradually contracted plugs. The results show that this type of energy dissipater is suitable for spill tunnels of high head （nearly 200 m） and large flow rate （nearly 2500 m^3/s）.

关键词： plug incipient cavitation number energy dissipater CFD

SCALE EFFECT OF I MPINGING PRESSURE CAUSED BY SUBMERGED JET

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第4期17卷 478-482页

作者： TIAN Zhong xu wei-lin WANG wei LIU Shan-jun DONG Jian-wei State Key Hydraulics Laboratory of High Speed Flows Sichuan University Chengdu 610065 China Military Oil Supply Engineering Department Logistical Engineering University Chongqing 400016China

The characteristics of the impinging pressure at the jet equipment where the maximum jet velocity can reach 50m/s were studied. By comparing the impinging pressure with the one measured at the low velocity conditions, two conclusions of the scale effect are drawn： firstly, the velocity attenuation degree is smaller than that of low velocity jet, and secondly, the relative impinging width is narrower than that of low-velocity jet. The reasons of the scale effect of the impinging pressure were elucidated through numerical simulation.

关键词： scale effect impinging pressure high-velocity jet numerical simulation

FAT10 level in human gastric cancer and its relation with mutant p53 level,lymph node metastasis and TNM staging

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第18期15卷 2228-2233页

作者： Feng Ji Xi Jin Chun-Hua Jiao Qin-wei xu Zi-wei Wang Yue-Liang Chen Department of Digestive Diseases First Affiliated Hospital of Zhejiang University Medical SchoolHangzhou 310003 Zhejiang Province China

AIM:To investigate the role of FAT10 and mutant p53 in the pathogenesis,severity and prognosis of gastric ***:FAT10,mutant p53 mRNA and protein levels were measured by reverse transcription(RT)-PCR and immunohistochemistry in gastric cancer tissue(n = 62),tumoradjacent tissue(n = 62) and normal gastric tissue(n = 62).Relation of FAT10 and mutant p53 expression with clinicopathological features and clinical outcomes of gastric cancer patients were ***:The FAT10,mutant p53 mRNA and protein levels were signif icantly higher in gastric cancer than in its adjacent and normal *** FAT10 and mutant p53 levels in gastric cancer tissue were significantly correlated with lymph node metastasis and tumor,nodes,metastasis(TNM) ***,the high FAT10 level was associated with the overall survival rate of *** Cox-proportional hazards model analysis showed that mRNA and protein levels of FAT10 and mutant p53,lymph node metastasis,distant metastasis and TNM stage were the independent prognostic factors for gastric ***:FAT10 may be involved in gastric carcinogenesis,and is a potential marker for the prognosis of gastric cancer ***10 and mutant p53 may play a common role in the carcinogenesis of gastric cancer.

关键词： Gastric cancer FAT10 Mutant p53 Prognosis

Isolation and characterization of an ERF-B3 gene associated with flower abnormalities in non-heading Chinese cabbage

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 2016年第3期15卷 528-536页

作者： xu Yu-chao HOU Xi-lin xu wei-wei SHEN Lu-lu Lü Shan-wu ZHANG Shi-lin HU Chun-mei State Key Laboratory of Crop Genetics and Germplasm Enhancement Ministry of Science and Technology/College of Horticulture Nanjing Agricultural University Nanjing 210095 P.R. China Agriculture Committee of Feixi County Hefei 230001 P.R. China

BrcERF-B3 gene, a member of ethylene-responsive factor family, was screened from a mutant plant in non-heading Chinese cabbage（Brassica rapa ssp. chinensis） by cDNA-AFLP technology. We got full length cDNA of two BrcERF-B3 genes by homology-based cloning from two materials and found that their nucleotide sequences were the same by sequencing. The BrcERF-B3 protein, belonging to the B3 subgroup of the ERF subfamily, shared a close relationship with B. rapa. RT-PCR result showed that BrcERF-B3 expressed only in mutant stamen rather than maintainer stamen. qRT-PCR results indicated that BrcERF-B3 expressed highly during reproductive growth development and in the early of mutant buds, suggesting BrcERF-B3 might be involved in the formation of abnormal flower in mutant. What＇s more, the expression of BrcERF-B3 was more significant to ABA, Me JA and cold stresses in mutant than in maintainer and was down-regulated in NaCl treatment in two lines, implying BrcERF-B3 might be different roles in biotic and abiotic stresses.

关键词： non-heading Chinese cabbage stamen-petalody ethylene-responsive factor gene expression

Design and Synthesis of Tb^(3+)-doped KGW Crystal for the Exploration of Scintillation Performance with X-ray Imaging

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2021年第8期40卷 1023-1030,969页

作者： xu Hui xu wei-wei xu Liu-wei WANG Zhi-Lin WANG Shuai-Hua SU Qing ZHANG Bi-Sheng ZENG Qing-You WU Shao-Fan College of Chemistry Fuzhou UniversityFuzhou 350108China Key Laboratory of Optoelectronic Materials Chemistry and Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Communications Planning&Design Institute Company Fuzhou 350004China Fujian Luhai Engineering Investigation&Designing Company Fuzhou 350000China

X-ray scintillators have been widely used in many fields owing to their strong penetrating ability,including security inspection,medical imaging,nuclear cameras,high energy physics and so *** explore new scintillation materials,we designed and synthesized KGW:Tb bulk scintillation crystals with monoclinic phase *** explored the fluorescence performance of KGW:Tb by testing the photoluminescence spectrum and fluorescence decay curve and observed strong green light emission in the visible light range at room ***,our crystal has a high stability under X-ray irradiation,a good sensitivity response and an appreciable light output(3424 ph/MeV)that is approximately twenty times more than ***,we used a 0.98 mm thickness polished crystal sheet for X-ray imaging applications and observed excellent ***,KGW:Tb crystal may be an important direction for X-ray scintillation detection.

关键词： KGW X-ray scintillators light yield high stability X-ray imaging

同方期刊数据库

HYDRODYNAMIC UPLIFT FORCE AND STABILITY OF ARCIFORM PLUNGE POOL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2002年第3期14卷 8-12页

作者： xu, wei-Lin Wang, wei Liu, Shan-Jun Qu, Jing-xue Diao, Ming-Jun Hydraulics Lab. of High Speed Flows Sichuan Univ. Chengdu 610065 China

Compared with general trapeziform plunge pools, an arciform plunge pool has its advantages, e.g. less excavate quantity, higher stability, etc. In this paper, the hydrodynamic pressure distribution on the soleplate of the arciform plunge pool is measured under a relatively dangerous condition of operation. The result is helpful to the design of the arciform plunge pool. The result also shows that the difference between the maximum and the minimum pressures on the upward surface of the soleplate may cause an additional uplift force on the soleplate under certain condition and should be taken into consideration in the uplift force calculation of the soleplate. The scour experiment verifies the higher stability of the arciform plunge pool.

关键词： Energy dissipators Hydrodynamics Pressure distribution Pressure measurement Stability Uplift pressure

The Electric Mechanism of Surface Pretreatments for Dye-Sensitized Solar Cells Based on Internal Equivalent Resistance Analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第1期29卷 279-282页

作者： xu wei-wei HU Lin-Hua LUO Xiang-Dong LIU Pei-Sheng DAI Song-Yuan Jiangsu Provincial Key Lab of ASIC Design Nantong UniversityNantong 226019 Division of Solar Energy Materials and Engineering Institute of Plasma PhysicsChinese Academy of SciencesHefei 230031

Based on the optimization of dye-sensitized solar cell (DSC) photoelectrodes pretreated with different methods such as electrodeposition,spin-coating and TiCl_(4) pretreatment,theoretical calculations are carried out to interpret the internal electric *** numerical values,including the series resistance R_(s) and the shunt resistance R_(sh) corresponding to the equivalent circuit model,are well evaluated and confirm that the DSC has good performance with a high R_(sh) and a low R_(s) due to good electrical contact and a low charge recombination after the different *** Ⅰ-Ⅴ curves are fifted in the case without series resistance,and account for the role of R_(s) in the output *** is found that when R_(s) tends to the infinitesimal,the short-circuit current Isc,the open-circuit voltage V_(oc) and the fill factor can be improved by almost 0.8-1.4,2.9 and 2.1-6.8%,respectively.

关键词： resistance coating Internal

Prevention of debris flow disasters on Chengdu-Kunming Railway

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 Environmental Sciences 2001年第3期13卷 333-336页

作者： WANG wei, xu wei\|lin, LIU Shan\|jun(State Key Hydraulics Lab. of High Speed Flow, Sichuan University, Chengdu 610065, China. 四川大学高速水力学国家重点实验室四川成都 610065

Chengdu-Kunming Railway is an important transport line on southwestern China. However, this railway's safety is often threatened by debris flows. How to effectively forecast and alarm the debris flow disasters and reduce the losses is the aim to study the prevention system in this paper. The factors to cause or influence debris flow are divided into four parts-the basin environmental factors, the basin meteoric factors, the prevention work's elements and the flood-relief work's elements, and the prevention system is made up of three models-a judgment model to assess the debris flow gully's seriousness, a forecast model to predict the debris flow's occurrence and an alarm model to evaluate the debris flow's disaster. Afterwards, a concise structure chart is worked out and verified by the field data from Chengdu-Kunming Railway. This prevention system will provide beneficial reference for the debris flow's monitoring network to be executed on Chengdu-Kunming Railway.

关键词： debris flow disaster prevention system Chengdu-Kunming Railway

Applications of in-situ solid-state nuclear magnetic resonance in methanol to olefins reaction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 134-151页

作者： Jing Niu Shutao xu Yingxu wei Zhongmin Liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical PhysicsChinese Academy of Sciences State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The methanol-to-olefins（MTO） reaction offers an alternative pathway for the production of low-carbon olefins from non-oil feedstocks. Fundamental research has been impeded by a lack of comprehensive understanding of its underlying mechanism,despite the significant progress made in industry. In-situ solid-state nuclear magnetic resonance（ss NMR） spectroscopy has emerged as a pivotal tool, offering crucial insights into key species under real-time operando conditions. Furthermore, the host–guest interaction between zeolites or surface species residing on zeolites and the reactant/active intermediates is revealed by the combination of in-situ13C MAS NMR and 2D correlation spectroscopy. Moreover, recent technological advancements in hyperpolarization（HP） methods, including HP129Xe NMR and dynamic nuclear polarization（DNP）, have significantly improved the sensitivity of ss NMR, enabling detailed structural and kinetic analysis as well as the detection of trace species. In this feature article, we summarized recent advancements in（in-situ） ss NMR spectroscopy applied to MTO reaction processes,encompassing mechanistic investigations at various stages and the intricate host–guest interactions. These theoretical insights into the dynamic evolution of MTO reactions lay a solid foundation for the optimization of catalytic processes and the development of efficient catalysts, thereby advancing the techniques towards more sustainable and economical production route for olefins.

关键词： MTO zeolites in-situ ssNMR reactive intermediates reaction mechanism