检索结果-南通市图书馆

PHASE BEHAVIOR OF CHARGE STABLIZED COLLOID DISPERSION WITH ADDED WATER SOLUBLE POLYMERS

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 Polymer Science 2013年第9期31卷 1218-1224页

作者： jia-xue Liu Yong-feng Men State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

Demixing and colloidal crystallization in the mixture of charge stabilized colloidal poly（methyl methacrylate） particles and soluble poly（ethylene oxide） were investigated by means of synchrotron small-angle X-ray scattering （SAXS） technique. Phase diagram of the mixture was obtained based on visual inspection and SAXS results. The phase behavior is determined as a function of the concentration of the polymer as well as the volume fraction of the colloidal particles. The system shows a one phase region when the concentration of the polymer is low, whereas a two-phase region is present when the concentration of the polymer is larger than a critical concentration at certain volume fraction of the colloids. Interestingly, a face centered cubic colloidal crystalline structure was formed under certain conditions, which has been rarely observed in experiments of colloid-polymer mixtures with competing interactions.

关键词： Colloid-polymer mixture Phase behavior Crystallization.

Ternary organic solar cells offer 14% power conversion efficiency

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2017年第23期62卷 1562-1564页

作者： Zuo Xiao xue jia Liming Ding Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and TechnologyBeijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Organic solar cells （OSCs） have advantages like light-weight, flexibility, colorfulness and solution processability [1 ]. The active layer of OSCs generally contains two organic semiconductors： an electron donor and an electron acceptor. The donor and acceptor make nanoscale phase separation to allow efficient exciton dissociation and also form a three-dimensional （3D） passage to rapidly transfer free charge carriers to respective electrodes.

关键词： Ternary organic solar cells power conversion efficiency

Effect of sintering temperature on the microstructure and thermal conductivity of Al/diamond composites prepared by spark plasma sintering

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 234-240页

作者： Ke Chu Cheng-chang jia xue-bing Liang Hui Chen School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Spark plasma sintering was used to fabricate Al/diamond *** effect of sintering temperature on the microstructure and thermal conductivity（TC） of the composites was investigated with the combination of experimental results and theoretical *** composite sintered at 550℃shows high relative density and strong interfacial bonding,whereas the composites sintered at lower（520CC） and higher（580-600℃） temperatures indicate no interfacial bonding and poor interfacial bonding,*** relative density and strong interfacial bonding can maximize the thermal conductivity of Al/diamond composites,and taking both effects of particle shape and inhomogeneous interfacial thermal conductance into consideration can give a fairly good prediction of composites＇ thermal conduction properties.

关键词： metal matrix composites thermal properties spark plasma sintering interface

Near-bed sediment transport in a heavily modified coastal plain estuary

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2014年第2期29卷 232-245页

作者： Gao-feng LIU jia-xue WU Yuan-ye WANG Shanghai Estuarine and Coastal Science Research Center The Center for Coastal Ocean Science and Technology Research School of Marine SciencesSun Yat-sen University

Numerous estuaries of the world have been strongly modified by human *** interferences can make great adjustments of not only sediment transport processes,but also the collective behavior of the *** paper provides a typical case of a heavily modified coastal plain estuary of Sheyang on the China coast,where a sluice barrage was built in 1956 to stop the intrusions of storm surges and saline *** sets of instrumented tripods were simultaneously deployed along a cross-shore transect to continuously observe near-bed flow currents and sediment *** in-situ surveys lasted over a spring and neap tide cycle when a strong wind event occurred in the neap *** of flows and sediment transport between tide-dominated and wind-dominated conditions demonstrated the important role of episodic wind events in flows and sediment *** wind-induced currents,bottom stresses,and sediment transport rates were significantly greater when wind was present than corresponding quantities induced by the *** long-shore sediment transport induced by winds exceeds the cross-shore component,especially near the river mouth *** results indicate the noticeable importance of wave-dominated coastal processes in shaping topographic features.A regime shift of estuarine evolution under highly intense human forcing occurs from fluvial to marine *** finding suggests that the management strategy of the estuarine system should focus on the restoration of estuarine processes,rather than the present focus on inhibition of marine dynamics.

关键词： Estuarine dynamics Sediment transport Strong wind event Anthropogenic effects

Projections of surface air temperature and precipitation in the 21st century in the Qilian Mountains,Northwest China,using REMO in the CORDEX

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2022年第3期13卷 344-358页

作者： Lan-Ya LIU xue-jia WANG Xiao-Hua GOU Mei-xue YANG Zi-Han ZHANG Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Gansu Liancheng Forest Ecosystem Field Observation and Research Station Lanzhou UniversityLanzhou 730333China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Qilian Mountains(QM)is an important ecological security barrier in China and has been significantly affected by climate change,it is therefore of great importance and necessity to project its future climate change using high-resolution climate models because of mountainous areas in the QM and relatively few targeted simulation *** this study,we used the simulations of the regional climate model REMO with 25 km spatial resolution,driven by three different global climate models(MPI-ESM-MR,NorESM1-M,and HadGEM2-ES),to evaluate how annual and seasonal mean surface air temperature and precipitation in the QM are likely to change for three future periods(2011-2040,2041-2070,and 2071-2100)under two representative concentration pathways(RCP2.6 and RCP8.5).The REMO model,shows noticeable cold and wet biases compared to observations for the reference period(1971-2000)and air temperature simulation outperforms precipitation *** REMO simulations exhibit a warm and wet centre around lake,indicating that the simulation are likely influenced by *** under RCP2.6 show regional warming reaching 1.74℃ during 2011-2100,characterized by an initial increase and a decrease *** RCP8.5,air temperatures increase monotonously from 2011 to 2100,with a warming magnitude of 5.36℃ for 2071-2100 relative to *** overall change in regional-average annual precipitation is not evident during 2011-2100,with some increases or decreases in certain time *** the 2071-2100 both the strongest warming and precipitation increase are projected to occur in winter under both scenarios,while precipitation in summer and autumn is projected to decrease in the east of the QM for the three future *** results suggest that the QM is likely to experience drought conditions in warm seasons in the future,which could impact agricultural and livestock production.

关键词： Qilian Mountains Climate projection REMO RCP scenario Regional climate model

Estimation of Bed Shear Stresses in the Pearl River Estuary

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

China Ocean Engineering 2015年第1期29卷 133-142页

作者：刘欢吴加学 Research Center of Coastal Ocean Science and Technology Sun Yat-sen University School of Marine Science Sun Yat-sen University

Mean and fluctuating velocities were measured by use of a pulse coherent acoustic Doppler profiler （PC-ADP） and an acoustic Doppler velocimeter in the tidal bottom boundary layer of the Pearl River Estuary. The bed shear stresses were estimated by four different methods： log profile （LP）, eddy correlation （EC）, turbulent kinetic energy （TKE）, and inertial dissipation （ID）. The results show that （a） all four methods for estimating bed stresses have advantages and disadvantages, and they should be applied simultaneously to obtain reliable frictional velocity and to identify potential sources of errors; （b） the LP method was found to be the most suitable to estimate the bed stresses in non-stratified, quasi-steady, and homogeneous flows; and （c） in the estuary where the semi-diurnal tidal current is dominant, bed shear stresses exhibit a strong quarter-diurnal variation.

关键词： bed shear stress bottom boundary layer PC-ADP Pearl River Estuary

在线全文

学校读者我要写书评

暂无评论

“寒门贵子”的家庭抗逆教育研究

绍兴文理学院学报 2024年第10期44卷 66-76页

作者：贾雪重庆三峡职业学院经济与管理学院重庆401331

通过教育获得社会地位升迁激励着无数农村学子用读书改变自己和家族的命运,在农村教育资源匮乏且发展不平衡不充分,农村家庭在文化程度、经济水平和社会地位不如中产阶层家庭的情况下,农村学生面临更多对学业不利的消极因素,但部分农村... 详细信息

通过教育获得社会地位升迁激励着无数农村学子用读书改变自己和家族的命运,在农村教育资源匮乏且发展不平衡不充分,农村家庭在文化程度、经济水平和社会地位不如中产阶层家庭的情况下,农村学生面临更多对学业不利的消极因素,但部分农村学生仍能突破社会藩篱取得高学业成就,成功实现“学业逆袭”。通过深度访谈对8位取得高学业成就的农村大学生及其家庭抗逆结构进行初探,借助Walsh家庭抗逆力理论搭建分析框架,发现农村大学生实现“学业逆袭”背后的家庭教育具有“抗逆性”,具体表现为德育为本、教育优先的家庭信念系统,分工明确、相互协同的家庭组织模式,平等对话、情感坦诚的家庭沟通过程。三者紧密联系,相互影响并转化为家庭抗逆教育的主要内容。探究农村大学生获得学业成功背后的家庭教育因素与智慧,有助于破除底层家庭教育“污名化”偏见,传承新时代优良家风,推广优秀家庭教育理念。

关键词：家庭抗逆家庭教育农村大学生家庭抗逆教育

A Deblurring Procedure for Two-dimensional Small Angle X-ray Scattering Patterns

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2016年第4期34卷 505-512页

作者： Ran Chen Zhi-yong Yi jia-xue Liu 刘震宇门永锋 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

A general pre-processing procedure of the measured SAXS patterns for reducing the effect of beam stop and beam stop holder is described. A proper method for automatically choosing the regularization parameter is implemented. The method works out on the two-dimensional SAXS patterns. After deblurring, the corresponding two-dimensional patterns will be converted into one-dimensional integrated intensity distribution curves. We tested the program using both calculated artificial data and real experimental data such as polystyrene and poly（methyl methacrylate） latices. The deblurred results are satisfactory showing the effectiveness of the method. The deblurring process of a typical two-dimensional SAXS pattern using the Matlab based program can be completed in few seconds on normal personal computers.

关键词： Deblur PS latex PMMA colloidal dispersion SAXS.

Association between the cumulative triglyceride-glucose index and the recurrence of atrial fibrillation after radiofrequency catheter ablation

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2024年第2期21卷 200-210页

作者： Qing YAN jia-Qi LIANG Yi-De YUAN Yuan LI jia-Li FAN Wen-Huan WU Pan XU jia-Hong xue Department of Cardiovascular Medicine the Second Affiliated Hospital of Xi’an Jiaotong UniversityShaanxiChina Department of Cardiovascular Medicine Zichang People’s HospitalShaanxiChina Department of Ultrasound Xijing HospitalAir Force Military Medical UniversityShaanxiChina

BACKGROUND Triglyceride-glucose(TyG)index values are a new surrogate marker for insulin *** study aimed to explore the relationship between cumulative TyG index values and atrial fibrillation(AF)recurrence after radiofrequency catheter ablation(RFCA).METHODS A total of 576 patients with AF who underwent RFCA at the Second Affiliated Hospital of Xi'an jiaotong University were included in this *** participants were grouped based on cumulative TyG index values tertiles within 3 months after *** regression and restricted cubic spline analyses were used to determine the relationship between cumulative TyG index values and AF *** predictive value of all risk factors was assessed by receiver operating curve *** There were 375 patients completed the study(age:63.23±10.73 years,64.27%male).The risk of AF recurrence increased with increasing cumulative TyG index values *** adjusting for potential confounders,patients in the medium cumulative TyG index group[hazard ratio(HR)=4.949,95%CI:1.778–13.778,P=0.002]and the high cumulative TyG index group(HR=8.716,95%CI:3.371–22.536,P<0.001)had a higher risk of AF recurrence than those in the low cumulative TyG index *** restricted cubic spline regression model also showed an increased risk of AF recurrence with increasing cumulative TyG index *** considering cumulative TyG index values,left atrial diameter,and lactate dehydrogenase levels as a comprehensive factor,the model could effectively predict AF recurrence after RFCA[area under the curve(AUC)=0.847,95%CI:0.797–0.897,P<0.001].CONCLUSIONS Cumulative TyG index values were a risk factor for AF recurrence after *** longitudinal TyG index values may assist with optimized for risk stratification and outcome prediction for AF recurrence.

关键词： atrial fibrillation index