检索结果-南通市图书馆

Chemical Research in Chinese Universities 2006年第1期22卷 17-20页

作者： CHANG Song qin Chao WANG Xin-long LI Yang-guang WANG En-bo Institute of Polyoxometalate Chemistry Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

A novel polyoxometalate [H3O][PMo5^ⅥMo7^ⅤO40 （V^ⅣO）4]·6Py （Py = pyridine） was synthesized and characterized by IR spectrometry, TG and single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic space group（C2/m） with α=1.3680（3） nm, b=2.1740（4） nm, c=1.1630（2） nm, β= 118.62（3）°, V= 3. 0362 （10） nm^3, Z = 2, and Rt （wR2） = 0. 0772 （0. 2312）. The compound contains a highly reduced vanadylpoly-molybdophosphate polyoxometalate anion with a four-capped structure. The four {VO} units cap four opposite pits of the pseudo-Keggin core {PMo12O40}.

关键词： Highly reduced polyoxometalate anion Hydrothermal synthesis Four-capped Pseudo-Keggin core

Insight into vertical piezoelectric characteristics regulated thermal transport in van der Waals two-dimensional materials

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 770-779页

作者： Dong-Hai Wei E Zhou Jin-Yuan Xu Hui-Min Wang Chen Shen Hong-Bin Zhang Zhen-Zhen qin guang-Zhao qin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China Hunan Key Laboratory for Micro-Nano Energy Materials and Device and School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105China Institute of Materials Science Technical University of DarmstadtAlarich-Weiss-Str.264287DarmstadtGermany School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China

The urgent demand of extreme(ultra-high/low)thermal conductivity materials is triggered by the high-power device,where exploring the theories and mechanisms of regulating thermal transport properties plays a key ***,we elaborately investigate the effect of vertical(out-of-plane)piezoelectric characteristics on thermal transport,which is historically *** different stacking-order(AA and AB)bilayer boron nitride(Bi-BN)in two-dimensional(2D)materials are selected as study *** performing state-of-the-art first-principles calculations,it is found that the polarization charge along the out-of-plane orientation ascends significantly with the increasing piezoelectric response in AB stacked Bi-BN(Bi-BN-AB)followed by the enhanced interlayer B–N atomic ***,the amplitude of phonon anharmonicity in Bi-BN-AB increases larger than that in the AA stacked Bi-BN(Bi-BN-AA),resulting in the dramatic weakening of the thermal conductivity by 20.34%under 18%*** research reveals the significant role of the vertical(out-of-plane)piezoelectric characteristic in regulating thermal transport and provides new insight into accurately exploring the thermal transport performance of 2D van der Waals materials.

关键词： Thermal conductivity Piezoelectric effect 2D materials Bilayer BN Strain engineering

Full waveform inversion based on hybrid gradient

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第3期21卷 1660-1670页

作者： Chuang Xie Zhi-Liang qin Jian-Hua Wang Peng Song Heng-guang Shen Sheng-Qi Yu Ben-Jun Ma Xue-qin Liu qingdao Innovation and Development Base Harbin Engineering UniversityQingdao266000ShandongChina qingdao Innovation and Development Center Harbin Engineering UniversityQingdao266000ShandongChina CNOOC Research Institute Co. Ltd.Beijing100028China College of Marine Geoscience Ocean University of ChinaQingdao266100ShandongChina Weihai Sunfull Geophysical Exploration Equipment Co. Ltd.Weihai264209ShandongChina

The low-wavenumber components in the gradient of full waveform inversion(FWI)play a vital role in the stability of the ***,when FWI is implemented in some high frequencies and current models are not far away from the real velocity model,an excessive number of low-wavenumber components in the gradient will also reduce the convergence rate and inversion *** solve this problem,this paper firstly derives a formula of scattering angle weighted gradient in FWI,then proposes a hybrid *** hybrid gradient combines the conventional gradient of FWI with the scattering angle weighted gradient in each inversion frequency band based on an empirical formula derived *** weighted hybrid mode,we can retain some low-wavenumber components in the initial lowfrequency inversion to ensure the stability of the inversion,and use more high-wavenumber components in the high-frequency inversion to improve the convergence *** results of synthetic data experiment demonstrate that compared to the conventional FWI,the FWI based on the proposed hybrid gradient can effectively reduce the low-wavenumber components in the gradient under the premise of ensuring inversion *** also greatly enhances the convergence rate and inversion accuracy,especially in the deep part of the *** the field marine seismic data experiment also illustrates that the FWI based on hybrid gradient(HGFWI)has good stability and adaptability.

关键词： Full waveform inversion Hybrid gradient Scattering angle weighted Low-wavenumber component

Design, synthesis and in vitro evaluation of phenylbenzamidine derivatives as SSRIs

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第7期18卷 814-816页

作者： Jing Yang Xiaofang Wang Hui Wen Fang qin guang Zhong Yang Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Science Beijing 100050 China

A series of phenylbenzamidine analogs were synthesized and tested for their biological activities of inhibiting the reuptake of 5-HT. All of them were new compounds, and their structures were confirmed by 1HNMR, MS an... 详细信息

关键词： SSRIs Phenylbenzamidine XRD

Efficacy and Safety of Glecaprevir/Pibrentasvir for Chronic Hepatitis C Patients:A Systematic Review and Meta-analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2020年第3期8卷 267-276页

作者： Hong-qin Xu Chun-guang Wang Peng Xiao Yan-Hang Gao Department of Hepatology The First Hospital of Jilin UniversityJilin UniversityChangchunJilinChina Department of Surgery The Second Hospital of Jilin UniversityChangchunJilinChina

Background and Aims:Glecaprevir/pibrentasvir is a pangenotypic regimen recently approved for the treatment of chronic hepatitis C virus(HCV)*** objective of the present review was to summarize the findings from clinical trials to understand how patient-related factors influence glecaprevir/pibrentasvir efficacy(sustained virologic response rates at 12 weeks’after treatment[referred to as SVR12])and ***:Data from 21 phase III clinical trials were ***:The integrated efficacy analysis included 4,817 *** showed 97.5%of all included patients with chronic HCV achieved SVR12 in the intention-to-treat ***12 rate was>95%across subgroups of *** integrated safety analysis included 4,015 *** showed that 64.1%of patients reported an adverse event,and<0.1%of patients reported a serious adverse event related to glecaprevir/***:These results indicate that the 8-or 12-week glecaprevir/pibrentasvir treatment is effective for patients infected with HCV genotypes 1-6 without or with compensated cirrhosis,with good safety profiles,irrespective of ***/pibrentasvir is a good option for patients with human immunodeficiency virus/HCV coinfection and comorbid HCV and severe renal impairment.

关键词： Hepatitis C virus Chronic hepatitis C Cirrhosis Glecaprevir/pibrentasvir ABT-493/ABT-530 Meta-analysis Clinical trials

Uncertainty in hottest years ranking: analysis of Tibetan Plateau surface air temperature

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

Atmospheric and Oceanic Science Letters 2017年第4期10卷 337-341页

作者： HUA Wei YANG Kai-qin FAN guang-Zhou School of Atmospheric Sciences/Joint Laboratory of Climate and Environment Change/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science Technology

Changes in surface air temperature can directly affect hydrology, agriculture, and ecosystems through extreme climate events such as heat waves. For this reason, and to improve climate change adaptation strategies, it is important to investigate the ranking of hottest years. In this study, the Wilcoxon signed-ranktest and Monte Carlo simulation are used to estimate the ranking of the hottest years for theTibetan Plateau （TP） in recent decades, and the uncertainty in the *** Wilcoxon signed-rank test shows that the top 10 hottest years on record over the TP mainly occur after 1998. The top three hottest years are ranked as 2006, 2009, and 2010, but there is almost no significant difference between them. When both sampling and observational errors are considered, only five years have a non-zero probability of being the hottest year, with the three highest probabilities being for the years 2006 （-47.231%）, 2009 （-40.390%）, and 2010 （-12.376%）. Similarly, with respect to a given year that is among the 10 hottest years, our results show that all the years among the ranks of 1-10 resulting from the Wilcoxon signed-rank test have probabilities above 10%, while the years 2001 and 2012 have probabilities of 3% and 4%.

关键词： Hottest years uncertainty ranking Tibetan Plateau

Supercontinuum Generation in a Photonic Crystal Fibre

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2004年第6期21卷 1093-1095页

作者： YANPei-guang RUANShuang-Chen LINHao-jia DUChen-Lin YUYong-qin LUKe-Cheng YAOJian-Quan ShenzhenKeyLaserEngineeringLaboratory ShenzhenUniversityShenzhen518060 CollegeofPrecisionInstrumentandOpto-ElectronicsEngineering TianjinUniversityTianjin300072 InsitituteofPhysics NankaiUniversityTianjin300071

Nearly 1000-nm broad continuum from 390 nm to 1370 nm is generated in a 2-m long photonic crystal fibre. The maximum total power of supercontinuum is measured to be 60 mW with the pumping power of 800 mW output from a 200-fs Ti: sapphire laser. The evolution of the pumping light into supercontinuum is experimentally studied in detail. It is found that the mechanism for supercontinuum generation has direct relations with Raman effect and soliton effect, and the four-wave mixing plays an important role in the last phase of the supercontinuum generation.

关键词： Optics quantum optics and lasers

Effects of ethanol extract of Bombax ceiba leaves and its main constituent mangiferin on diabetic nephropathy in mice

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 Natural Medicines 2017年第8期15卷 597-605页

作者： XU guang-Kai SUN Chen-Yu qin Xiao-Ying HAN Yu LI Yi XIE Guo-Yong qin Min-Jian Department of Resources Science of Traditional Chinese Medicines State Key Laboratory of Natural MedicinesChina Phar-maceutical UniversityNanjing 211198China Department of Pharmacology of Chinese Materia Medica China Pharmaceutical UniversityNanjing 211198China

The present study was designed to explore the mechanism by which ethanol extract of Bombax ceiba leaves(BCE) and its main constituent mangiferin(MGF) affect diabetic nephropathy by combating oxidative stress. Oral administration of BCE and MGF to normal and streptozotocin(STZ)-induced diabetic mice were carried out. Fasting blood glucose, 24-h urinary albumin, serum creatinine, and blood urea nitrogen were tested, histopathology, and immunohistochemical analysis of kidney tissues were performed. Moreover, mesangial cells were treated with BCE and MGF for 48 h with or without 25 mmol·L^(-1) of glucose. Immunofluorescence, Western blot and apoptosis analyses were used to investigate their regulation of oxidative stress and mitochondrial function. BCE and MGF ameliorated biochemical parameters and restored STZ-induced renal injury in the model mice. In vitro study showed that high glucose stimulation increased oxidative stress and cell apoptosis in mesangial cells. BCE and MGF limited mitochondrial membrane potential(Δψm) collapse by inhibiting Nox4, mitochondrially bound hexokinase II dissociation, and subsequent ROS production, which effectively reduced oxidative stress, cleaved caspase-3 expression and cell apoptosis. Our work indicated that BCE and MGF had protective effects on diabetic caused kidney injury and prevented oxidative stress in mesangial cells by regulation of hexokinase II binding and Nox4 oxidase signaling.

关键词： Bombax ceiba Mangiferin Diabetic neprropathy Mitochondrial function Oxidative stress

Total synthesis of glypetelotine

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第6期20卷 643-644页

作者： Xiang Hong Huang Xu Feng Lin Su qin Chen Yan guang Wang College of Biology and Environmental Engineering Zhejiang Shuren University Hangzhou 310015 PR China Department of Chemistry Zhejiang University Hangzhou 310027 PR China College of Chemical and Material Engineering Wenzhou University Wenzhou 325027 PR China

A total synthesis of glypetelotine, the first sulphur-containing indole alkaloid from the leaf extracts of Glycosmis petelotii collected in the north of Vietnam, was described from indole through 6 steps. The structure of the glypetelotine was confirmed by IR, 1H NMR, 13C NMR and MS analysis. The spectral data of synthetic compound was identical with those of natural compound.

关键词： Sulphur-containing alkaloid Glypetelotine Total synthesis Indole

Treatment of phosphate-containing oily wastewater by coagulation and microfiltration

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第4期18卷 629-633页

作者： ZHANG Jin SUN Yu-xin HUANG Zhi-feng LIU Xing-qin MENG guang-yao Department of Materials of Science and Engineering University of Science and Technology of China Hefei 230026China School of Chemistry and Chemical Engineering Anhui University Hefei 230039 China National Key Laboratory of Transient Physics Nanjing 210094 China Great Wall New Century Membrane Technology Corporation Hefei 230601 China

The oily wastewater generated from pretreatment unit of electrocoating industry contains oils, phosphate, organic solvents, and surfactants. In order to improve the removal efficiencies of phosphate and oils, to mitigate the membrane fouling, coagulation for ceramic membrane microfiltration of oily wastewater was performed. The results of filtration tests show that the membrane fouling decreased and the permeate flux and quality increased with coagulation as pretreatment. At the coagulant Ca （OH）2 dosage of 900 mg/L, the removal efficiency of phosphate was increased from 46.4% without coagulation to 99.6%; the removal of COD and oils were 97.0% and 99.8%, respectively. And the permeate flux was about 70% greater than that when Ca（OH）2 was not used. The permeate obtained from coagulation and microfiltration can be reused as make-up water, and the recommended operation conditions for pilot and industrial application are transmembrane pressure of 0.10 MPa and cross-flow velocity of 5 m/s. The comparison results show that 0.2 μm ZrO2 microfilter with coagulation could be used to perform the filtration rather than conventional ultrafilter, with very substantial gain in flux and removal efficiency of phosphate.

关键词： ceramic membrane crossflow microfiltration coagulation phosphate removal fouling mitigation phosphate-containing oily wastewater