检索结果-南通市图书馆

Next-generation sequencing technology:A technology review and future perspective

在线全文

学校读者我要写书评

暂无评论

Science china(life Sciences) 2010年第1期53卷 44-57页

作者： ZHOU XiaoGuang1,REN LuFeng1,li YunTao2,zhang Meng1,YU YuDe2 & YU Jun1 1 Key Laboratory of Genome Sciences and Information,beijing institute of Genomics,Chinese Academy of Sciences,beijing 100029,china 2 institute of Semiconductors,Chinese Academy of Sciences,beijing 100083,china Key Laboratory of Genome Sciences and Information Beijing Institute of Genomics Chinese Academy of Sciences Beijing China institute of Semiconductor Chinese Academy of Sciences Beijing China

As one of the most powerful tools in biomedical research,DNA sequencing not only has been improving its productivity at an exponential growth rate but has also been evolving into a new layout of technological territories toward engineering and physical disciplines over the past three *** this technical review,we look into technical characteristics of the next-generation sequencers and provide insights into their future development and *** envisage that some of the emerging platforms are capable of supporting the USD1000 genome and USD100 genome goals if given a few years for technical *** also suggest that scientists from china should play an active role in this campaign that will have a profound impact on both scientific research and societal healthcare systems.

关键词： genomics DNA sequencing next generation sequencing technologies sequencer

Petrogenesis and dating of the Kangding complex,Sichuan Province

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2005年第5期48卷 622-634页

作者： CHEN Yuelong 1 , LUO Zhaohua 1 , ZHAO Junxiang, li Zhihong, zhang Hongfei & SONG Biao 3.1. Faculty of Earth Sciences and Natural Resources, china University of Geosciences, beijing 100083, china 2. Faculty of Earth Sciences, china University of Geosciences, Wuhan 430074, china 3. beijing SHRIMP Center, institute of geology, Chinese Academy of Geological Sciences, beijing 100037, china Faculty of Earth Sciences and Natural Resources China University of Geosciences Beijing China Faculty of Earth Sciences China University of Geosciences Wuhan China beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Beijing China

An analysis of major and trace element geochemistry and SHRIMP U-Pb zircon dating of mafic, intermediate, and felsic rocks from the Mianning metamorphic complex of Si- chuan Province was conducted. One of our conclusions is that a majority of the zircons crystal- lized between 721 and 773 Ma in a magmatic regime. The complexes contain early to late Pa- leo-proterozoic relict zircons from ancient continental crust. The oldest age, 2468 Ma, may rep- resent the basement of the Yangtze block. Overgrowth zircon rims and palingenetic zircons have been observed and dated, and are believed to have formed after crystallization, during Paleozoic and Mesozoic metamorphic-anatexis. We also conclude that depletion of Nb, Ta, HREE, in a spider-diagram normalized to primitive mantle and calc-alkaline association, implies that they formed in island-arc or under-plating settings.

关键词： Kangding complex, zircons, SHRIMP, tectonic setting.

Detection of the Kuroshio frontal instable processes (KFIP) in the East china Sea using the MODIS images

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2010年第6期29卷 35-43页

作者： JIA Yongjun zhang Jie National Satellite Ocean Application Service Beijing 100081 China First institute of Oceanography State Oceanic Administration Qingdao 266061 China

The Kuroshio frontal instable processes （KFIP） in the East china Sea （ECS） not only have a great impact on the hydrologic characteristics,the pollutants drift,the distribution of seafloor sediment and the ships navigation of the ECS,but also are closely related to the climate changes of the coastal areas of the *** the frequency and area of occurrence of the KFIP have not been studied fully and *** of its high spatial and temporal resolution,MODIS data is a kind of very good data source for surveying and researching the KFIP in the *** aim of this study is to detect the KFIP in the ECS by using MODIS data,and to study the frequency and region of occurrence of the KFIP in the *** selection has coverage of level 2 data of MODIS SST and Kd490 ranging from July 1,2002 to June 30,2009 of the ECS when there was no cloud impact or *** using of the data,the minimum standard of the Kuroshio temperature fronts and the diffuse attenuation coefficient （Kd490） fronts of the ECS are *** on these standards and the curvature distinguish methods,the standard of curvature distinguish for the KFIP in the ECS are put *** making use of this standard,we study a total of 2073 satellite-derived images,and discover that as long as there is no cloud impact from January to May and October to December,the KFIP in the ECS are surely found in MODIS satellite *** June to September,the frequency of occurrence can also reach to 82.9% at ***,it is obtained that there are three source regions of these instability processes,namely,（26°N,121.5°E） nearby,（27°N,125°E） nearby and （30°N,128°E） *** differences of the characteristics of these instability processes which are generated in different regions are analyzed in the present study.

关键词： Kuroshio frontal instable processes frequency and region of occurrence East china Sea MODIS

Present state,basic theories,methods and progresses of investigation and assessment on marine hazardous geology in china

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2003年第4期22卷 577-595页

作者： li Peiying1, li Ping1, liu Lejun1, Du Jun1, zhang Xiaolong1, Wang Shengji2 1. First institute of Oceanography,State Oceanic administration,Qingdao 266061,china 2. institute of Marine geology,Ministry of Land and Natural Resources,Qingdao 266071,china First institute of Oceanography State Oceanic Administration Qingdao 266061 China institute of Marine geology Ministry of Land/Natural Resources Qingdao 266071 China

The achievement progresses of investigation and studies on marine hazardous geology are summarized and presentsd in the late 20 century in china. The importance, research value and present-day studies of marine hazardous geology, a newly developing branch of geoscience, are well expatiated. Several often confused concepts and theories are explained and redefined here. The comment on the means of investigations, assessment of marine hazardous geology, as well as its evolution, innovation, existing questions and future tasks are also introduced and presented. The concepts of 'hazard geology', geohazard', 'map of marine hazard geology', 'integrated evaluaton on seafloor stablity' are respectively discussed, including their definition, research objects, methods and contents. The types and classification of marine hazardous geology, principles and methods of marine hazardous geology map compilation, the assessment methods and models of marine hazardous geology environment and seafloor stability and so on are also discussed.

关键词： ocean hazardous geology geohazard present state of investigation and research basic theories assessment methods progresses

A suspended sediment satellite sensing algorithm based on gradient transiting from water-leaving to satellite-detected reflectance spectrum

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2000年第10期45卷 925-931页

作者： li Yan & li Jing1. Second institute of Oceanography, State Oceanic administration, Hangzhou 310012, china 2. institute of Remote Sensing Technology and Application, Peking University, beijing 100871, china Second institute of Oceanography State Oceanic Administration Hangzhou China institute of Remote Sensing Technology and Application Peking University Beijing China

In order to remove the fluctuating atmospheric effects from the Case 2 water, an algorithm for retrieval of suspended sediment concentration from NOAA weather satellite imagery was developed under a new approach. This model is based on the linear response from water-leaving to satellite-detected reflectance spectra, simply reflected by the gradient for correlation curve between reflectance of the advanced very high resolution radiometer (AVHRR) channels 1 (R1, 580-680 nm) and 2 (R2, 720-1 100 nm). Proportional factor for this gradient transiting, mathematically represented as (td2/td1) (toz2/toz1), depends on a ratio of atmospheric transmittance for such two channels, including ozone and diffuse transmittance. As a simple but efficient algorithm of gradient, the algorithm of αR1-R2 is selected to retrieve gradient a and then sea surface suspendend sediment concentration.

关键词： marine remote sensing suspended sediment atmospheric effect removal gradient transit AVHRR.

Structures and physical properties of rigid polyurethane foams with water as the sole blowing agent

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2006年第4期49卷 363-370页

作者： li Xiaobin1,2, CAO Hongbin1 & zhang Yi1 1. institute of Process Engineering, Chinese Academy of Sciences, beijing 100080, china 2. Graduate School of the Chinese Academy of Sciences, beijing 100039, china institute of Process Engineering Chinese Academy of Sciences Beijing China Graduate School of the Chinese Academy of Sciences Beijing China

Rigid polyurethane foams blown by varying water level were prepared in this study. The structures and physical properties of rigid polyurethane foams blown by water were measured with FT-IR, universal testing machine (Instron3365), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The results show that polyurea and polybiuret were the typical charac- teristics, and the cream time and gel time were shorter for the fully water blown rigid foams than that for the fully cyclopentane blown foams. The density of foam samples decreased from 45.0 kg/m3 to 27.4 kg/m3 with the increase of water level from 3 pph to 7 pph. Compressive strength exhibited the similar behavior with density. The average cell size of foam samples ranged from 241 μm to 356 μm with the increase of water level from 3 pph to 7 pph, respectively. At the same time, poorer dimen- sional stability was encountered with the increase of average cell size due to fast diffusion rate of CO2 out of the foam. The results of thermal analysis show that the glass transition temperature (Tg) shifted to a higher temperature with the increase of isocyanate level when more water was used as chemical blowing agent.

关键词： polyether polyol, polyurethane rigid foam, compressive strength, dimensional stability, cell size, glass transition temperature.

Simulation of freezing and melting of soil on the northeast Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第20期56卷 2145-2155页

作者： XIA Kun 1,2,3,LUO Yong 2,4,5 & li WeiPing 2 1 institute of Atmospheric Physics,Chinese Academy of Sciences,beijing 100029,china 2National Climate Center,china Meteorological administration,beijing 100081,china 3Graduate University of Chinese Academy of Sciences,beijing 100049,china 4 Center for Earth System Science,Tsinghua University,beijing 100084,china 5Key Laboratory of Earth System Numerical Simulation,Ministry of Education,beijing 100084,china institute of Atmospheric Physics Chinese Academy of Sciences Beijing China National Climate Center China Meteorological Administration Beijing China Graduate University of Chinese Academy of Sciences Beijing China Center for Earth System Science Tsinghua University Beijing China Key Laboratory of Earth System Numerical Simulation Ministry of Education Beijing China

Using observational data spanning the period from February to December 2009 and recorded at the Suli station in Qinghai Province,the land-surface model CLM3.0 was employed to simulate the freezing and melting of *** results indicate that the simulated soil temperature is higher than the observed soil temperature and the ultimate thawing date is earlier than the observed date during the melting *** the freezing period,the simulated soil temperature is lower than the observed soil temperature and the ultimate freezing of the deep soil is earlier than that ***,the simulation of freezing is better than that of melting,and the simulation of a shallow layer is better than that of a deeper *** the original CLM3.0,it is assumed that frozen soil begins to melt when the soil temperature exceeds 0C,which is inconsistent with *** critical freeze-thaw temperature was calculated according to thermodynamics equations and the freeze-thaw condition was *** this work,the melting rate for frozen soil was reduced using the modified scheme,and the simulated soil temperature was lowered. Meanwhile,the refreezing of soil during the melting season was well simulated and more closely matched ***,it was found that the rates of melting and freezing differ,with the former being slower than the latter,but refreezing during the melting season is rather quick.

关键词：土壤温度冻结期青藏高原东北部模拟融化观测数据热力学方程表面模型

Improvement of Ga_(2)O_(3)vertical Schottky barrier diode by constructing NiO/Ga_(2)O_(3)heterojunction

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2024年第4期45卷 63-68页

作者： Xueqiang Ji Jinjin Wang Song Qi Yijie liang Shengrun Hu Haochen Zheng Sai zhang Jianying Yue Xiaohui Qi Shan li zeng liu Lei Shu Weihua Tang Peigang li School of Integrated Circuits&State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China College of Integrated Circuit Science and Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China beijing Microelectronics Technology institute Beijing 100076China

The high critical electric field strength of Ga_(2)O_(3)enables higher operating voltages and reduced switching losses in power electronic *** Schottky metals and epitaxial films are essential for further enhancing device *** this work,the fabrication of vertical Ga_(2)O_(3)barrier diodes with three different barrier metals was carried out on an n--Ga_(2)O_(3)homogeneous epitaxial film deposited on an n+-β-Ga_(2)O_(3)substrate by metal-organic chemical vapor deposition,excluding the use of edge *** ideal factor,barrier height,specific on-resistance,and breakdown voltage characteristics of all devices were investigated at room *** addition,the vertical Ga_(2)O_(3)barrier diodes achieve a higher breakdown volt-age and exhibit a reverse leakage as low as 4.82×10^(-8)A/cm^(2)by constructing a NiO/Ga_(2)O_(3)***,Ga_(2)O_(3)power detailed investigations into Schottky barrier metal and NiO/Ga_(2)O_(3)heterojunction of Ga_(2)O_(3)homogeneous epitaxial films are of great research potential in high-efficiency,high-power,and high-reliability applications.

关键词： Ga_(2)O_(3) Schottky barrier diode NiO/Ga_(2)O_(3)heterojunction

Sedimentary environment of the Dajin conglomerate in Tibet, age of foraminiferan assemblages and their tectonic significance

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第11期15卷 1014-1020页

作者： YAN Zhen, FANG Aimin, PAN Yusheng, li Jiliang, liU Xiaohan, YU liangjun and zhang Binggao (Laboratory of lithosphere Tectonic Evolution, institute of geology and Geophysics, Chinese Academy of Sciences, beijing 100029, china institute of Tibet Plateau Research, Chinese Academy of Sciences, beijing 100029, china Nanjing institute of Paleontology, Chinese Academy of Sciences, Nanjing 210008, china) Laboratory of lithosphere Tectonic Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China institute of Tibet Plateau Research Chinese Academy of Sciences Beijing 100029 China Nanjing institute of Paleontology Chinese Academy of Sciences Nanjing 210008 China

The Dajin conglomerate, which is one of the most important sedimentary successions of the Xigaze forearc basin in Tibet, china, consists of deep-shallow marine tuffaceous turbidites and clastic rocks bearing Nummulites, Assilina, Alveolina and Lock-hartia . These fossils are very similar to the foraminiferan in the Jialazi and Maila conglomerates, and those in Gangba and Dingri areas. They developed in the Eocene. By analyzing the spatial variation of Eocene sedimentary environments of Tibet Plateau and the foraminiferan in the Dajin conglomerate, we found that Eocene sedimentation should take place on both sides of the Yarlung Tsangpo suture, and the late Eocene tectonic uplifting should make the forearc basin expose out of the sea level and begin to receive nonmarine deposits.

关键词： Dajin conglomerate marine deposits Eocene foraminiferan Yarlang Tsangpo sutnre.