检索结果-南通市图书馆

High resolution full-spectrum water Raman lidar

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第5期55卷 1224-1229页

作者： LIU FuChao yi fan JIA JingYu ZhanG YunPeng ZhanG ShaoDong YU ChangMing TAN ying School of Electronic Information Wuhan UniversityWuhan 430079China Key Laboratory of Geospace Environment and Geodesy Ministry of EducationWuhan 430079China State Observatory for Atmospheric Remote Sensing Wuhan 430079China

在空气的水内容和在云的水阶段变化的时间空间的分发的知识为大气的学习是重要的。为这个目的，我们开发了能收集拉曼的完整光谱的水拉曼激光雷达同时从冰，水微滴和水蒸汽表明的高分辨率。双栅栏 polychromator 和一个 32 隧道光电倍... 详细信息

在空气的水内容和在云的水阶段变化的时间空间的分发的知识为大气的学习是重要的。为这个目的，我们开发了能收集拉曼的完整光谱的水拉曼激光雷达同时从冰，水微滴和水蒸汽表明的高分辨率。双栅栏 polychromator 和一个 32 隧道光电倍增管试管察觉者被用来获得一光谱在水的完整的拉曼光谱范围的 0.19 nm 的分辨率。初步的观察在无云的状况下面介绍混合阶段云和潮湿的空气的水拉曼光谱特征。

关键词：激光雷达高分辨率水含量拉曼频谱光谱分辨率光电倍增管时空分布

Influence of dynamic pressure on deep underground soft rock roadway support and its application

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2016年第5期26卷 903-912页

作者： Meng Qingbin han Lijun Chen Yanlong fan Jiadong Wen Shengyong Yu Liyuan Li Hao State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals Shangdong University of Science & Technology

Due to high ground stress and mining disturbance, the deformation and failure of deep soft rock roadway is serious, and invalidation of the anchor net-anchor cable supporting structure occurs. The failure characteristics of roadways revealed with the help of the ground pressure monitoring. Theoretical analysis was adopted to analyze the influence of mining disturbance on stress distribution in surrounding rock,and the change of stress was also calculated. Considering the change of stress in surrounding rock of bottom extraction roadway, the displacement, plastic zone and distribution law of principal stress difference under different support schemes were studied by means of FLAC3D. The supporting scheme of U-shaped steel was proposed for bottom extraction roadway that underwent mining disturbance. We carried out a similarity model test to verify the effect of support in dynamic pressure. Monitoring results demonstrated the change rules of deformation and stress of surrounding rock in different supporting schemes. The supporting scheme of U-shaped steel had an effective control on deformation of surrounding rock. The scheme was successfully applied in underground engineering practice, and achieved good technical and economic benefits.

关键词： Deep soft rock roadway Dynamic pressure impact Similarity model test Combined support Ground pressure monitoring

Mercury speciation, bioavailability and risk assessment on soil–rice systems from a watershed impacted by abandoned Hg mine-waste tailings

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2019年第3期38卷 391-403页

作者： Jian Pang Jialiang han Xuelu fan Chan Li Xian Dong Longchao Liang Zhuo Chen School of Chemistry and Materials Science Guizhou Normal University College of Resource and Environmental Engineering Guizhou University

Mercury(Hg) is a global pollutant and can be accumulated in the food chain, posing exposure risks to humans. In this study, rice plants and corresponding rhizosphere soil samples were collected from a watershed of the Wawu River Basin that is heavily impacted by historic Hg mining and retorting activities. Total mercury(THg)and methylmercury(MeHg) in rice grains, as well as other tissues and soil samples, were measured. Five soil Hg fractions, as well as soil parameters, were also *** results show that the average concentrations of THg and MeHg in rice grains were 14 ± 7.0 lg kg^(-1) and7.2 ± 4.0 lg kg^(-1). Soil organic-bound(Hg-o) and strong complex-bound(Hg-s) were the main Hg fractions,accounting for 44% of the total. To estimate the Hg–ligand interaction in the soils, soil-N/Hg(R = 0.451, p \ 0.05),-S/Hg(R = 0.372, p \ 0.1), and-OM/Hg ratio(R = 0.320,p \ 0.5) with MeHg_(soil) were observed with significant positive correlations, indicating that the formation of Hg–OM, Hg–N–OM or Hg–S–OM complexes could prevent Hg(II) from methylation in soils. The significant positive correlations of the-N/Hg ratio,-S/Hg ratio and-OM/Hg ratio with MeHg in rice tissues suggested that Hg methylation and MeHg demethylation occurred throughout the rice paddy ecosystem. The estimated MeHg daily intake(EDI) was 0.075 ± 0.041 lg kg^(-1) bw d^(-1) and was lower than the RfD level of 0.1 lg kg^(-1) bw d^(-1) recommended by the US EPA. However, approximately 29% of the hazardous index(HI) of MeHg in grain exceeded 1, posing a potential threat to local populations, particularly pregnant women and children.

关键词： Mercury and methylmercury Rice Mercury speciation and bioavailability Paddy soil Risk assessment

A simple method to extract glacier length based on Digital Elevation Model and glacier boundaries for simple basin type glacier

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2017年第9期14卷 1776-1790页

作者： JI Qin YANG Tai-bao HE yi QIN Yan DONG Jun HU fan-sheng Institute of Glaciology and Ecogeography College of Earth and Environmental Sciences Lanzhou University Lanzhou 73000 China Faculty of Geomatics Lanzhou Jiaotong University Lanzhou 730000 China Research Center for Arid Area and Desert College of Earth and Environmental Sciences Lanzhou University Lanzhou 730000 China

Glacier length is a key morphological element that has many glaciological applications; however, it is often difficult to determine, especially for glaciers that cover larger spatial areas or those that exhibit frequent temporal change. In this paper, we describe a new Arc GIS-based method that can derive glacier flow lines for determining glacier length based on digital elevation model and glacier outlines. This method involves(1) extraction of the highest and lowest points on a glacier,(2) calculation of 10-m contour lines on the glacier from 10 m to 100 m height, and(3) connection of the midpoints of each contour line with the highest and the lowest points in order to create a flow line, which is subsequently smoothed. In order to assess the reliability of this method, we tested the algorithm's results against flow lines calculated using field measurements, analysing data from the Chinese Glacier Inventory, and manual interpretation. These data showed that the new automated method is effective in deriving glacier flow lines when contour lines are relatively large; in particular, when they are between 70 m and 100 m. Nonetheless, a key limitation of the algorithm is the requirement to automatically delete repeated and closed curves in the pre-treatment processes. In addition to calculating glacier flow lines for derivation of glacier length, this method also can be used to effectively determine glacier terminus change.

关键词：数字高程模型提取方法冰川学长度边界地理信息系统测量计算自动化方法

Evolution of Surface Transversal Crack in Intermediate Slabs during Hot Rolling Deformation

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2014年第4期21卷 476-480页

作者： Yan-zhao LUO Jiong-ming ZhanG Qiang LIU Mao-kang LI yi-tong han yi-fei CAO School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

In the continuous casting of steels, surface transversal cracks are often found. These defects may severely influence the final quality of the products. The evolution of transversal V-shaped cracks with different depth on the surface of a continuously cast steel slab during hot rolling was studied. The artificial V-shaped cracks were made on the surface. The rolling process parameters from an industrial rolling mill have been used as a reference. The speci- mens of rolled workpiece in intermediate slabs were obtained after different rolling passes. The morphology of sur- face crack and microstructure evolution in the rolling process were investigated by optical microscopy. The results show that the depth of surface transversal crack gradually decreased with the increase of rolling passes. The grain size of ferrite and pearlite on the sample surface also gradually reduced. The microstructures around cracks with the dif ferent depth are almost identical, without direct correlation with the initial crack depth.

关键词： intermediate slab surface transversal crack microstructure hot rolling

Second laparoscopic resection for recurrent hepatocellular carcinoma after initial laparoscopic hepatectomy： case report

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第11期122卷 1359-1360页

作者： LIANG Xiao CAI Xiu-jun YU Hong WANG yi-fan LIANG Yue-long Department of General Surgery Sir Run Run Shaw Hospital College of Medicine Zhejiang University Institute of Micro-Invasive Surgery of Zhejiang Univeristy Hangzhou Zhejiang 310016 China

With the development of laparoscopic techniques, laparoscopic hepatectomy is feasible for hepatocellular carcinoma as reported in recent years. Although several reports have been published on laparoscopic surgery for metastatic liver cancer, few of them deals with second laparoscopic resection of recurrent hepatocellular carcinoma. We report a case of second laparoscopic resection for recurrent hepatocellular carcinoma after initial laparoscopic hepatectomy.

关键词： laparoscopy resection recurrence liver carcinoma

Excitatory somatostatin interneurons in the dentate gyrus drive a widespread seizure network in cortical dysplasia

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

Signal Transduction and Targeted Therapy 2023年第6期8卷 3111-3122页

作者： Yang Zheng Cenglin Xu Jinyi Sun Wenjie Ming Sijie Dai Yuying Shao Xiaoyun Qiu Menghan Li Chunhong Shen Jinghong Xu fan Fei Jiajia fang Xuhong Jiang Guoqing Zheng Weiwei Hu yi Wang Shuang Wang Meiping Ding Zhong Chen Department of Neurology Zhejiang Provincial Hospital of Chinese MedicineThe First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou310060China Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province School of Pharmaceutical SciencesZhejiang Chinese Medical UniversityHangzhou310053China Institute of Pharmacology and Toxicology College of Pharmaceutical SciencesZhejiang UniversityHangzhou310058China Epilepsy Center Department of NeurologySecond Affiliated Hospital Zhejiang University School of MedicineHangzhou310009China Department of Neurology Fourth Affiliated Hospital of Zhejiang University School of MedicineYiwu322000China

Seizures due to cortical dysplasia are notorious for their poor prognosis even with medications and surgery,likely due to the widespread seizure *** studies have primarily focused on the disruption of dysplastic lesions,rather than remote regions such as the ***,we first quantified the epileptogenicity of the hippocampus in patients with late-stage cortical *** further investigated the cellular substrates leading to the epileptic hippocampus,using multiscale tools including calcium imaging,optogenetics,immunohistochemistry and *** the first time,we revealed the role of hippocampal somatostatin-positive interneurons in cortical dysplasia-related ***-positive were recruited during cortical dysplasia-related ***,optogenetic studies suggested that somatostatin-positive interneurons paradoxically facilitated seizure *** contrast,parvalbumin-positive interneurons retained an inhibitory role as in *** recordings and immunohistochemical studies revealed glutamate-mediated excitatory transmission from somatostatin-positive interneurons in the dentate *** together,our study reveals a novel role of excitatory somatostatin-positive neurons in the seizure network and brings new insights into the cellular basis of cortical dysplasia.

关键词： somatostatin dysplasia seizure

Chemoselective hydrogenation of α,β-unsaturated aldehydes with modified Pd/C catalyst

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 Chemical Letters 2012年第7期23卷 773-776页

作者： Wen Qiang Du Ze Ming Rong Yan Liang Yong Wang Xin yi Lu yi fan Wang Lian Hai Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China

Selective hydrogenation of α, β-unsaturated aldehydes with modified Pd/C catalyst was *** reduction of C=O bond could be efficiently inhibited by the addition of carbonates,and high selectivity to the corresponding saturated aldehydes was achieved under mild *** protocol provides an alternative for efficient preparation of saturated aldehydes.

关键词： Pd/C catalyst α,β-Unsaturatcd aldehydes Hydrogenation Selectivity

Optical multi-color monitoring of OJ 287 from 2006 to 2012

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第8期17卷 57-68页

作者： Qian Guo Ding-Rong Xiong Jin-Ming Bai Xu-Liang fan Wei-Min yi Yunnan Observatories Chinese Academy of Sciences Kunming 650216 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650216 China Center for Astronomical Mega-Science Chinese Academy of Sciences Beijing 100012 China University of Chinese Academy of Sciences Beijing 100049 China

We present our optical multi-color monitoring of the BL Lac object OJ 287 from January 2006to December 2012 in the V,R and I bands.A relatively active state in OJ 287 has been found over all monitored epochs,among which the variations of average magnitude in V/R/I bands were measured with ?V=1.956 mag,?R=2.067 mag and ?I=2.115 mag,*** reliable intraday variability is detected,but possible variability is detected on 16 *** relative variation amplitudes fall into the range between 1% and 8%,with the majority between 2% and 4%.No time lags have been detected,but strong correlations exist among light curves in the three *** bluer-when-brighter trend is dominant over intraday timescales,which supports the shock-in-jet *** combining with additional V/R band data obtained from SMARTS and the Steward Observatory,we also find a bluer-when-brighter trend over a long-term *** possible periods of 513,176,36,30,26,17 and 14 d are found in all time-series data sets from 2006 to *** explanations about these periods are given.

关键词： BL Lacertae objects individual(OJ 287)—galaxies active—galaxies photometry