|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Water in the Mogao Grottoes,China:where it comes from and how it is driven显示文摘The Dunhuang Mogao Grottoes in China was designated as a world heritage site by UNESCO in 1987 and is famous for its cultural relics. Water is the most active factor that harms the relics in the caves as it damages the grotto murals and painted sculptures. Thus, determining the water sources and driving forces of water movement is a key issue for protecting these cultural relics. These issues have troubled relics protectors for a long time. In this study, the authors chose a representative cave in the Mogao Grottoes and, by completely sealing the cave to make a closed system, measured the water vapor from the surrounding rock. This was accomplished by installing a condensation–dehumidification temperature–humidity control system for the collection of water vapor. The results show that there is continuous evaporation from the deep surrounding rock into the cave. The daily evaporation capacity is determined to be 1.02 g/(d?m2). The water sources and driving forces of water movement were further analyzed according to the character of the water evaporation and by monitoring the temperature and humidity of the surrounding rock. It was found that the water vapor in the cave derives from phreatic water. Moreover, the yearly fluctuation of temperature in the surrounding rock and geothermal forces are the basic powers responsible for driving phreatic evaporation. Under the action of the yearly temperature fluctuations, decomposition and combination of bound water acts as a 'pump' that drives phreatic water migration and evaporation. When the temperature rises, bound water decomposes and evaporates; and when it falls, the rock absorbs moisture. This causes the phreatic water to move from deep regions to shallow ones. Determining the source and dynamic foundation of the water provides a firm scientific basis for protecting the valuable cultural relics in the caves. | HongShou LI WanFu WANG HongTao ZHAN Fei QIU QingLin GUO GuoBin ZHANG | 2015 | Journal of Arid Land2015，7，1： | 10 |
| 2 | Synthesis,characterization and catalytic properties of Y-β zeolite composites显示文摘Y-β zeolite composites were hydrothermally synthesized by using high silica Y zeolite as the precursor and characterized by XRD,N2 adsorption,SEM and IR spectra of pyridine.The result showed that the N2 adsorption-desorption isotherm of the zeolite composites had a distinct hysteresis loop,and the SEM result showed that the zeolite composites had a different morphology from Y,β and the corresponding physical zeolite mixture.The acid catalytic performance of the zeolite composite catalysts was investigated in the hydrocracking and hydroisomerization of n-octane,and the results showed that the composite materials exhibited an excellent hydrocracking activity and good hydroisomerization performance.The yield of i-C4 over the zeolite composite catalyst was 4.45% higher than that on the corresponding zeolite mixture in the n-octane hydrocracking process at 553 K.The isomerization ability of n-octane over the composite catalyst was 3.6 fold that of the corresponding mixture at 503 K. | Qin Bo Zhang Xiwen Zhang Zhizhi Ling Fengxiang Sun Wanfu | 2011 | Petroleum Science2011，8，2： | 9 |
| 3 | Impact of Shipping Distance on Online Retailers' Sales:A Case Study of Maiyang on Tmall显示文摘Many studies have qualitatively explained that information and communication technology(ICT) has loosened the restrictions of distance and space on retailers' sales. Few empirical studies, however, have explored the impact of shipping distance on online retailers' sales. This study examined the Maiyang(M-Y) store on Tmall in China as a case study to investigate the relationship between shipping distance and sales. The results showed that sales volume in 2014 at the county level did not strictly obey the distance decay law. The shipped distance of high-priced commodities may not be much longer than that of low-priced commodities. Within the scope of investigation, the relationships between income, cost, and net profit curves do not follow central place theory. Goods have neither thresholds nor ranges. The key factor in the spatial discrepancy of sales is the size of market. The impact of shipping distance on sales is not as strong as that of traditional retailers in Information Era. | ZHOU Chunshan JIN Wanfu ZHANG Guojun | 2018 | Chinese Geographical Science2018，28，2： | 4 |
| 4 | GSPAC water movement in extremely dry area显示文摘Under an extremely arid condition,a PVC greenhouse was built on the top of Mogao Grottoes in gobi area.The results of 235-day constant extraction of condensed water on the greenhouse film and soil water content showed that 2.1 g/(m2·d) groundwater moved up and exported into the soil,and a phreatic water evaporation existed in the extreme dry area where the groundwater is buried deeper than 200 m.After a prolonged export,the soil water content in the greenhouse was not lower but obviously higher than the original control ones.According to the monitored parameters including relative humidity and absolute humidity of soil,and temperature outside and inside the greenhouse,it was found that there is the available condition and mechanism for the upward movement of groundwater,and also it can be sure that the exported water was not from the soil and atmosphere outside the greenhouse.Phreatic water,an important source for soil water,interacts with atmosphere moisture via soil respiration.Soil salinity also has important effects on soil water movement and spatial-temporal heterogeneity.The extremely dry climate,terrestrial heat and change of upper soil temperature are the fundamental driving forces of water transportation and phreatic water evaporation in the Groundwater-Soil-Plant-Atmosphere Continuum(GSPAC) system. | HongShou Ll WanFu WANG GuoBin ZHANG ZhengMo ZHANG XiaoWei WANG | 2011 | Journal of Arid Land2011，3，2： | 4 |
| 5 | Glycine functionalized activated carbon derived from navel orange peel for enhancement recovery of Gd(Ⅲ)显示文摘Glycine functionalized activated carbon adsorption material(NOPAC-GLY-X)was successfully prepared by one-step thermal decomposition using agricultural waste navel orange peel as a precursor.Through batch adsorption experiments,it is found that the adsorption performance of Gd(Ⅲ)on activated carbon can be significantly enhanced by glycine modification.The adsorption isotherms of the NOPACs conform to the Langmuir isotherm model,and the maximum adsorption capacity of the activated carbon sample NOPAC-Gly-60 is approximately 48.5 mg/g.The Gd(Ⅲ)adsorption capacity of navel orange peel activated carbon can be doubled after glycine modification,and the adsorption efficiency of gadolinium can reach99%at pH=7.The physicochemical properties of the prepared adsorbents were characterized by Brunauer-Emmett-Teller(BET),Fourier transform infrared spectroscopy(FTIR),elemental analysis(EA),and X-ray photoelectron spectroscopy(XPS).The characterization test shows that the specific surface area of the sample increases from 1121 to 1523 m^(2)/g,and the ratio of(N+O)/C increases from 10.8%to 30.0%by the glycine modification.After five cycles of adsorption-desorption,the adsorption capacity can still be maintained at 88%of the initial capacity.NOPAC-GLY-60 has excellent adsorption selectivity for Gd(Ⅲ).With the obvious advantages of simple synthesis steps and low cost,the activated carbon modification method adopted in this study has great application value in the field of rare earth adsorption and recovery. | Bin Xiao Lijinhong Huang Wanfu Huang Dongmei Zhang Xiangrong Zeng Xiaohui Yao | 2022 | Journal of Rare Earths2022，40，11： | 3 |
| 6 | Effect of hole arrangement patterns on the leakage and rotordynamic characteristics of the honeycomb seal显示文摘The honeycomb seal is a vital component to reduce the leakage flow and improvethe system stability for the turbomachines. In this work, a three-dimensional model is established for the interlaced hole honeycomb seal (IHHCS) and the non-interlaced hole honeycombseal (NIHHCS) to investigate its leakage and rotordynamic characteristics by adopting computational fluid dynamics (CFD). Results show that the hole arrangement patterns have littleimpact on the pressure drop and turbulence kinetic energy distribution for the seals, and theIHHCS possesses a slightly lower leakage flow rate than the NIHHCS. Moreover, the numericalresults also show that the NIHHCS possesses a better rotordynamic performance than theIHHCS at all investigated conditions. Both seals show a larger k and a lower Ceff with the increase of the positive preswirl ratios and rotational speeds, while the negative preswirl ratioswould reduce the k and improve the Ceff. The NIHHCS possesses a higher absolute value ofFt for all operating conditions, this could explain the distinction of Ceff for both seals atdifferent working conditions. | Wanfu Zhang Chengjing Gu Xingchen Yang Kexin Wu Chun Li | 2022 | Propulsion and Power Research2022，11，2： | 2 |
| 7 | Numerical investigation on leakage and rotordynamic performance of the honeycomb seal with swirl-reverse rings显示文摘Honeycomb seals are a crucial component to restrict the leakage flow and improve system stability for the turbomachines and aero-engines.In this work,the leakage and rotordynamic performance of honeycomb seals with the Swirl-Reverse Ring(SRR)is predicted by employing the approach of Computational Fluid Dynamics(CFD)and the multifrequency whirling model theory.Numerical results show that the positive preswirl flow and circumferential velocity can be effectively weakened for the honeycomb seal as SRR is introduced.The obtained results also suggest that the direct stiffness,direct damping,and effective stiffness will not reduce,for the honeycomb seal is introduced to SRR.However,the honeycomb seal with SRR can significantly reduce the crosscoupled stiffness and remarkably enhance the effective damping.Meanwhile,the absolute value of negative tangential force acting on the rotor surface significantly increased for the honeycomb seal introduced SRR.Therefore,the whirling velocity of the rotor would be weakened.This phenomenon would be conducive to improve the stability of the rotor.Besides,the performance of SRR can be further enhanced when SRR possesses a smaller bending angle,and a higher arrangement density and height. | Chengjing GU Wanfu ZHANG Xingchen YANG Kexin WU Lu YIN | 2022 | Chinese Journal of Aeronautics2022，35，6： | 2 |
| 8 | The Notch pathway attenuates burn-induced acute lung injury in rats by repressing reactive oxygen species显示文摘Background:Acute lung injury(ALI)is a common complication following severe burns.The underlying mechanisms of ALI are incompletely understood;thus,available treatments are not sufficient to repair the lung tissue after ALI.Methods:To investigate the relationship between the Notch pathway and burn-induced lung injury,we established a rat burn injury model by scalding and verified lung injury via lung injury evaluations,including hematoxylin and eosin(H&E)staining,lung injury scoring,bronchoalveolar lavage fluid and wet/dry ratio analyses,myeloperoxidase immunohistochemical staining and reac-tive oxygen species(ROS)accumulation analysis.To explore whether burn injury affects Notch1 expression,we detected the expression of Notch1 and Hes1 after burn injury.Then,we extracted pulmonary microvascular endothelial cells(PMVECs)and conducted Notch pathway inhibition and activation experiments,via aγ-secretase inhibitor(GSI)and OP9-DLL1 coculture,respectively,to verify the regulatory effect of the Notch pathway on ROS accumulation and apoptosis in burn-serum-stimulated PMVECs.To investigate the regulatory effect of the Notch pathway on ROS accumulation,we detected the expression of oxidative-stress-related molecules such as superoxide dismutase,nicotinamide adenine dinucleotide phosphate(NADPH)oxidase(NOX)2,NOX4 and cleaved caspase-3.NOX4-specific small interfering RNA(siRNA)and the inhibitor GKT137831 were used to verify the regulatory effect of the Notch pathway on ROS via NOX4.Results:We successfully established a burn model and revealed that lung injury,excessive ROS accumulation and an inflammatory response occurred.Notch1 detection showed that the expression of Notch1 was significantly increased after burn injury.In PMVECs challenged with burn serum,ROS and cell death were elevated.Moreover,when the Notch pathway was suppressed by GSI,ROS and cell apoptosis levels were significantly increased.Conversely,these parameters were reduced when the Notch pathway was activated by OP9-DLL1.Mechanistically,the inhibition of NOX4 by siRNA and GKT137831 showed that the Notch pathway reduced ROS production and cell apoptosis by downregulating the expression of NOX4 in PMVECs.Conclusions:The Notch pathway reduced ROS production and apoptosis by downregulating the expression of NOX4 in burn-stimulated PMVECs.The Notch-NOX4 pathway may be a novel therapeutic target to treat burn-induced ALI. | Weixia Cai Kuo Shen Peng Ji Yanhui Jia Shichao Han Wanfu Zhang Xiaolong Hu Xuekang Yang Juntao Han Dahai Hu | 2022 | Burns & Trauma2022，10，1： | 2 |
| 9 | Tailor-mademagnetic Fe3 O 4 @ mTiO 2 microspheres with a tunable mesoporous anatase shell for highly selective and effec-tive enrichment of phosphopeptides显示文摘 | Ma Wanfu Zhang Ying Li Lulu | | 0，，4： | 1 |
| 10 | Structural Description of Polyaromatic Nucleus in Residue显示文摘原子磁性的回声光谱学(~ 1H-NMR ) ,同步荧光 spectrometry (SFS ) 和钌离子催化的质子氧化(RICO ) 方法被用来在阿曼残余部分决定 polyaromatic 原子核的化学结构。~ 1H-NMR 分析的结果证明在 aromatics,树脂和沥青质单位的芳香的戒指的平均数字分别地是 3.2, 5.6 和 8.2。SFS 被用来在残余部分,在 aromatics 的芳香的戒指的主要分发范围,树脂和沥青质调查芳香的戒指的分发分别地是 3-4 戒指, 3-5 戒指和超过 5 枚戒指。在残余部分的芳香的网络被氧化生产众多的羧基的酸。benzenepolycarboxylic 酸的类型和内容 benzenetricarboxylic 酸, benzenetetracarboxylic 酸, benzenepentacarboxylic 酸和 benzenehexacarboxylic 酸例如酞酸酸,在核心揭示了芳香的原子核的压缩类型。联本基部分(BIPH ) ,压缩 cata 的部分(CATA ) ,压缩仙子的部分(仙子) 和压缩索引(BCI ) 基于形成的 benzenepolycarboxylic 酸被计算。结果暗示在所有残余部分有更少的联本基类型结构。aromatics 部分几乎由压缩 cata 的类型系统组成,并且,沥青质部分完全在树脂部分由压缩仙子的类型系统组成共存二种类型,此处压缩仙子的类型在压缩 cata 的类型上是占优势的。基于在学习,部件 -aromatics, 树脂和沥青质获得的分析结果 - 被给多半结构的模型。 | Zhang Huicheng Yan Yongjie Sun Wanfu Wang Jifeng | 2007 | China Petroleum Processing & Petrochemical Technology2007，9，3： | 1 |
| 11 | The airflow field and dynamic processes of pyramid dunes显示文摘 | Weimin Zhang Jianjun Qu Zhibao Dong Xiaoze Li Wanfu Wang | 2000 | Journal of Arid Environments2000，，4： | 1 |
| 12 | Bone Marrow Transplantation Combined with Mesenchymal Stem Cells Induces Immune Tolerance without Cytotoxic Conditioning显示文摘 | Yunchuan Wang Jiaqi Liu Chengfeng Xu Wanfu Zhang Li Bai Na Li Yang Liu Yaojun Wang Yingjun Su Dahai Hu | 2011 | Journal of Surgical Research2011，，1： | 1 |
| 13 | The gobi sand stream and its control over the top surface of the Mogao Grot- toes, China 显示文摘 | Zhang Weimin Wang Tao Wang Wanfu | 2004 | Bulletin of Engineering Geology and the Envi- ronment2004，63，3： | 1 |
| 14 | Concentrations,sources,and influential factors of water-soluble ions of atmospheric particles in Dunhuang Mogao Grottoes,a world heritage site in China显示文摘Atmospheric particle pollution is one of the major factors leading to degradation of ancient wall paintings,particularly heritage sites in arid and semi-arid regions.However,current systematic research on the changes,sources,and influential factors of atmospheric particulate matter and its water-soluble ion concentrations is not sufficient.Thus,the major water-soluble ion concentrations,sources,and influential factors of atmospheric particles PM_(2.5) and PM_(10)(particulate matter with an aerodynamic equivalent diameter≤2.5 and 10.0μm,respectively,in ambient air)were collected from Cave 16 and its ambient exterior environment in the Dunhuang Mogao Grottoes,China,between April 2015 and March 2016.Results showed that the concentrations of PM_(2.5) and PM_(10) inside and outside the cave were the highest in March 2016 and the lowest in December 2015.The higher particle concentration from March to May was related to the frequent occurrence of sand and dust events,and the lower particle concentration from June to September was associated with good diffusion conditions,increased precipitation,and an established cave shelterbelt.The concentration of particulate matter inside the cave was affected by the concentration of particles in the air outside the cave.Ca2+,NH+4,Na+,Cl-,and SO2-4were the main components of the total ions of PM_(2.5) and PM_(10) both inside and outside the cave.The total ions inside the cave were frequently affected by the disturbance of tourists'activities during the peak tourist season from May to August.Under the influence of dust,the total concentrations of Cl-,SO2-4,Na+,NH+4,and Ca2+in particles of different sizes inside and outside the cave increased,and the concentrations of Cl-,SO2-4,Na+,and Ca2+decreased during precipitation period.Backward air mass trajectory analysis suggested that the pollutants were mainly from Xinjiang,China.The pollutant sources of air particulates are straw burning,secondary pollution sources,soil dust,dry spring rivers,and tourist activities. | YANG Xiaoju WU Fasi XU Ruihong LI Na ZHANG Zhengmo XUE Ping WANG Wanfu ZHAO Xueyong | 2022 | Journal of Arid Land2022，14，12： | 1 |
| 15 | Structural features of binary microporous zeolite composite Y-Beta and its hydrocracking performance显示文摘 | Xiwen Zhang Qun Guo Bo Qin Zhizhi Zhang Fengxiang Ling Wanfu Sun Ruifeng Li | 2009 | Catalysis Today2009，，1： | 1 |
| 16 | Tailor-Made Magnetic Fe3O4@mTiO2 Microspheres with a Tunable Mesoporous Anatase Shell for Highly Selective and Effective Enrichment of Phosphopeptides显示文摘 | MA Wanfu ZHANG Ying LI Lulu | 2012 | ACS Nano2012，6，4： | 1 |
| 17 | Rotordynamic characteristics prediction for scallop damper seals using computational fluid dynamics显示文摘Enhancing damping characteristic is one of the effective methods to solve the instability problem of the rotor system.The three-dimensional numerical analysis model of scallop damper seal was established,and the effects of inlet pressures,preswirl ratios,rotational speeds,interlaced angles and seal cavity depths on the rotordynamic characteristics of scallop damper seal were studied based on dynamic mesh method and multi-frequencies elliptic whirling model.Results show that the direct stiffness of the scallop damper seal increases with decreasing inlet pressure and increasing rotational speed and cavity depth.When the seal cavity is interlaced by a certain angle,which shows positive direct stiffness.The effective damping of the scallop damper seal increases with the increasing inlet pressure,the decreasing preswirl ratio and the rotational speed and cavity depth.There exists an optimal interlaced angle to maximize the effective damping and the system stability.The leakage of the scallop damper seal is significantly reduced with decreasing inlet pressure.The preswirl will reduce the leakage flowrate,and the rotational speed has a slight effect on the leakage performance.The leakage of the scallop damper seal decreases with increasing seal cavity depth. | Wanfu ZHANG Lu YIN Li YANG Haoyang TIAN Chun LI | 2022 | Chinese Journal of Aeronautics2022，35，8： | 0 |
| 18 | Organocatalyzed Highly Efficient Michael Addition of Malonate Derivatives to α,β-Unsaturated Ketones Using Chiral Schiff Bases显示文摘 | Yonghai Hui Jianzhong Zhang Wanfu Sun Zhengfeng Xie | 2011 | Journal of Chemistry and Chemical Engineering2011，5，9： | 0 |
| 19 | Strong in-plane optical anisotropy in 2D van der Waals antiferromagnet VOCl显示文摘Two-dimensional(2D)van der Waals(vdW)magnetic materials with strong in-plane anisotropy can make possible novel applications such as optospintronics and strain sensors.In this work,the strong in-plane optical anisotropy in 2D vdW antiferromagnet VOCl has been systematically investigated.The optical brightness and absorption coefficient exhibit evident periodic variation with the change of incident polarization,unveiling the strong in-plane anisotropic optical absorption.The Raman intensity in this material shows obvious dependence on the polarization angle of incident laser,demonstrating that the phonon properties possess strong in-plane anisotropy.Besides,we have also realized in-situ visualization of in-plane optical reflection anisotropy in this material.Moreover,the strong second harmonic generation(SHG)signal can only be detected when the incident polarization is along specific in-plane crystal orientations,illustrating the presence of strong in-plane nonlinear optical anisotropy.These findings will benefit the applications of VOCl in the field of polarization-dependent electronics and spintronics. | Tianle Zhang Jiantao Du Wenjun Wang Keming Wu Shuai Yue Xinfeng Liu Wanfu Shen Chunguang Hu Minghui Wu Zhe Qu Shengxue Yang Chengbao Jiang | 2023 | Nano Research2023，16，5： | 0 |
| 20 | Audit mode change,corporate governance and audit effort显示文摘This study investigates changes in audit strategy in China following the introduction of risk-based auditing standards rather than an internal control-based audit mode.Specifically,we examine whether auditors are implementing the risk-based audit mode to evaluate corporate governance before distributing audit resources.The results show that under the internal control-based audit mode,the relationship between audit effort and corporate governance was weak.However,implementation of the risk-based mode required by the new auditing standards has significantly enhanced the relationship between audit effort and corporate governance.Since the change in audit mode,the Big Ten have demonstrated a significantly better grasp of governance risk and allocated their audit effort accordingly,relative to smaller firms.The empirical evidence indicates that auditors have adjusted their audit strategy to meet the regulations,risk-based auditing is being achieved to a degree,reasonable and effective corporate governance helps to optimize audit resource allocation,and smaller auditing firms in particular should urgently strengthen their risk-based auditing capability.Overall,our findings imply that the mandatory switch to risk-based auditing has optimized audit effort in China. | Limei Cao Wanfu Li Limin Zhang | 2015 | China Journal of Accounting Research2015，，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员