检索结果-南通市图书馆

Test of magnetic susceptibility and grain-size age models of loess

Progress in Natural Science:Materials International 2007年第11期17卷 1312-1317页

作者： Chen Yimeng1,2,3, Feng Zhaodong4 and Gong Huili1,2(1. MOE and Key Laboratory of Resources Environment and GIS of Beijing, Beijing 100037, China 2. Key Laboratory of 3D information Acquisition and Application, The Capital Normal University, Beijing 100037, China 3. Department of Economics & Management of Huizhou University, Huizhou 516007, China 4. Key Laboratory of Western China’s Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000, China) MOE and Key Laboratory of Resources Environment and GIS of Beijing Beijing 100037 China

Ages of the stratigraphic boundary MIS1/2 and MIS3/4 of the Yuanbu loess section in Linxia are used as the basis of the nodal control age. The age of MIS1/2 and MIS3/4 are obtained from the latest international research result—the climatic events recorded in the stalagmite in the Hulu Cave in Nanjing, that MIS1/2 is 11.5 kaB.P. and MIS3/4 is 59.8 kaB.P.. The ages of the two climatic events contain three nodal age control models (Model 1: 0 kaB.P.—59.8 kaB.P.; Model 2: 0 kaB.P.—11.5 kaB.P. and 11.5 kaB.P.—59.8 kaB.P.; Model 3: 11.5 kaB.P.—59.8 kaB.P.), which are used as the nodal control age separately. The deposition times of various stratigraphic horizons are calculated by using the magnetic susceptibility age model and grain-size age model, and then compared with each other. In addition, the AMS14C age, OSL age and the ages of YD and H events are compared with the ages of the corresponding horizons calculated by the three models of nodal control ages. From the analyses of lithologic characters and climatic stages it has been found that both the magnetic susceptibility age model and the grain-size age model have some defects. Because the accurate control ages are selected as the nodal points of the glacial period or interglacial period, the stratigraphic deposition times determined by the high resolution of magnetic susceptibility age model and grain-size age model approximate to the actual ages. As for the relative accuracy of the two age models, the magnetic susceptibility age model is more accurate than the grain-size age model.

关键词： loess nodal control age magnetic susceptibility age model grain-size age model test

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Horizontal distribution of Changjiang Diluted Water in summer inferred from total suspended sediment in the Yellow Sea and East China Sea

引用

Acta Oceanologica Sinica 2015年第12期34卷 44-50页

作者： lee Dong-Kyu KWON Jae-Il SON Seung Hyun Pusan National University Coastal Disaster Research Center Korea Institute of Ocean Science and Technology China-Korea Joint Ocean Research Center Cooperative Institute for Research in the Atmosphere Colorado State University

During the summer in the Yellow Sea and East China Sea, the resuspension of the bottom sediment is obstructed by strong stratification and, as a result, the concentration of total suspended sediment（TSS） can be used as an excellent tracer for Changjiang Diluted Water（CDW）. To analyze the spatial and temporal variations of the CDW distribution, the monthly mean TSS from Moderate Resolution Imaging Spectroradiometer（MODIS） ocean color data are constructed and are converted to salinity using the relationship between salinity observed from AQUARIUS and TSS. The process produces the detailed horizontal distribution of salinity with very high resolution（1 km）. From monthly mean salinity map from 2002 to 2012 in July and August, the expansion patterns of CDW are analyzed. The southerly wind in July and southeasterly wind in August transport the CDW eastward and northeastward, respectively. It is found that the yearly variation of the expansion of CDW toward the southern sea area of Korea is mostly due to the variation of southerly wind and the fluctuations of fresh water discharge into the Changjiang estuary show relatively little impact on the eastward extend of CDW. When 11-year mean（from2002 to 2012） salinity map in August is compared with World Ocean Atlas 2013, it is revealed that wind in August strengthened six times from 1994 and it causes the expansion of CDW extended 150 km further eastward.

关键词： Yellow and East China Seas Changjiang diluted water total suspended sediment MODIS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

抛膜链齿输送式残膜回收机设计与试验

引用

农业机械学报 2018年第3期49卷 122-129页

作者：王旭峰胡灿鲁兵弋晓康侯书林中国农业大学工学院北京100083 塔里木大学机械电气化工程学院阿拉尔843300

新疆棉田残膜污染问题严重,机械回收残膜是目前主要的回收方式。现有残膜回收机普遍采用弹齿或伸缩杆齿式起膜装置,回收过程中容易出现残膜缠绕工作部件、卸膜难等问题,影响起膜和卸膜效果。为此,借鉴现有机型的优点,通过刨膜辊刀起膜... 详细信息

新疆棉田残膜污染问题严重,机械回收残膜是目前主要的回收方式。现有残膜回收机普遍采用弹齿或伸缩杆齿式起膜装置,回收过程中容易出现残膜缠绕工作部件、卸膜难等问题,影响起膜和卸膜效果。为此,借鉴现有机型的优点,通过刨膜辊刀起膜、抛膜辊刀抛送原理,设计一种起膜抛送、链齿输送、自动脱膜的抛膜链齿输送式残膜回收机。该机具主要由起膜装置、输送装置、脱膜装置、传动系统和集膜箱等组成。残膜通过抛送起膜,配合链齿输送,实现残膜与土块分离,保证了起膜的可靠性;利用自动脱膜和刮板式脱膜机构完成卸膜,解决了残膜缠绕、卸膜难的问题。田间试验结果表明:当作业速度为4~7 km/h时,残膜回收率均值为90.6%,机具作业效率均值为0.84 hm^2/h,残膜含杂率均值为3.971%,当作业速度较快时,提高了作业效率,但回收率降低,含杂率增大。当作业速度为5 km/h时,回收率均值为91.8%,作业效率均值为0.733 hm^2/h,含杂率均值为2.605%,为较适宜的作业速度。该机具运行可靠,起膜与脱膜效果较好,可用于新疆棉田残膜回收。

关键词：棉田残膜回收抛膜链齿输送式田间试验

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigation of fine and complex vortex circulation structures

引用

Science China Earth Sciences 2010年第10期53卷 1552-1558页

作者： LUO ZheXian1,MA GeLan1 & PING Fan2 1 Remote Sensing College,Nanjing University of Information Science and Technology,Nanjing 210044,China 2 Laboratory of Cloud-Precipitation Physics and Severe Storms(LACS),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China Remote Sensing College Nanjing University of Information Science and Technology Nanjing China Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

The formation and evolution of fine and complicated vortex circulation structures were investigated using a two-dimensional quasi-geostrophic barotropic model *** find that the highly localized asymmetric and complex configuration of energy transfer flux between large-and small-scale components is caused by the nonlinear interaction between a large-scale vortex with an initial axi-symmetric flow and four beta meso-scale *** complex structure is characterized by a fine pattern,which contains seven closed systems with spatial scales of less than 100 km,embedded in a positive flux wave train and a negative wave train,*** average wind speed decreased with time in the positive flux region,but was nearly unchanged in the negative flux *** pattern reveals the evolutionary asymmetry and localization of wind speed of the major *** track of the major vortex center has a trend toward the center of the negative flux center,indicating that there is a certain relation between the complex structure of the energy transfer flux and the motion of the major vortex *** results imply that the formation and evolution of the fine and complex structure should be attributed to the nonlinear interaction between the vortices at different spatial scales.

关键词： vortex complex structure non-linear interaction energy cascade

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental EOS determination of aluminum at Mbar pressure

引用

Science China(Physics,Mechanics & Astronomy) 2004年第4期47卷 416-423页

作者： CHEN Jianping1,2, LI Ruxin1, ZENG Zhinan1, WANG Xingtao1 & XU Zhizhan1 1. Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China 2. Beijing Aeronautical Technology Research Center, Beijing 100076, China Shanghai Institute of Optics and Fine Mechanics Shanghai China Beijing Aeronautical Technology Research Center Beijing China

A shock wave is driven by a laser pulse of 1.2 ps duration (FWHM), with the intensity of ～1014 W/cm2 at 785 nm, irradiating a 500 nm thick aluminum foil. A chirped laser pulse split from the main pulse is used to detect the shock breakout process at the rear surface of the target based on frequency domain interferometry. The mean shock velocity determination benefits from the precise synchronization (＜100fs resolution) of the shock pump and probe laser pulses, which is calculated from the time the shock takes to travel the 500 nm thick aluminum. The released particle velocity determination benefits from the chirped pulse frequency domain interferometry. The average shock velocity is 15.15 km/s and the shock release particle velocity is 15.24 km/s, and the corresponding pressure after shock is 3.12 Mbar under our experimental condition.

关键词： shock wave, equation of state, chirped laser pulse.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于地幔动力学模拟推断云南地区剪切波各向异性源的深度

引用

地球物理学报 2018年第3期61卷 948-962页

作者：朱涛中国地震局地球物理研究所北京100081 中国地震局地球物理研究所(地震观测与地球物理成像重点实验室) 北京100081 中国地震局地质研究所地震动力学国家重点实验室北京100029

地震各向异性与地幔对流导致的变形存在因果关系,因此地幔对流模拟可被用来预测地震各向异性,并推测剪切波各向异性地幔源的深度.本文建立了基于地震速度结构的地幔对流模型来预测云南地区剪切波分裂的快波方向,它同时受地表板块运动和... 详细信息

地震各向异性与地幔对流导致的变形存在因果关系,因此地幔对流模拟可被用来预测地震各向异性,并推测剪切波各向异性地幔源的深度.本文建立了基于地震速度结构的地幔对流模型来预测云南地区剪切波分裂的快波方向,它同时受地表板块运动和地幔内部的温度扰动所驱动.通过与观测结果进行对比分析,推测在云南地区西北部和东部区域,剪切波各向异性源主要存在于岩石圈中.在西南部和四川盆地及其西缘,地幔流动可能是剪切波各向异性的主要贡献者,各向异性层分别位于210~330km和170~330km深度,导致西南部剪切波各向异性的地幔可能处于大幅度的剪切变形状态,而四川盆地及其西缘主要处于中等强度的剪切变形状态.

关键词：地幔流动地幔对流地幔变形剪切波分裂板块运动

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analgesic efficacy of median nerve stimulation in mice with chemotherapy-induced peripheral neuropathy via modulation of brain-derived neurotrophic factor expression

引用

中医杂志:英文版 2023年第4期43卷 686-694页

作者： Dong-Wook Kang Jae-Gyun Choi Hee Ju Song Jaehyuk Kim Miae lee Taehee Kim Suk-Yun Kang Yeonhee Ryu Hwa Seung Yoo Jin Sun lee Jin Bong Park Sang Do lee Hyun-Woo Kim Department of Physiology and Medical Science College of Medicine and Brain Research InstituteChungnam National UniversityDaejeon 35015Republic of Korea km Fundamental Research Division Korea Institute of Oriental Medicine Daejeon 34054Republic of Korea East-West Cancer Center Dunsan Korean Medicine Hospital of Daejeon UniversityDaejeon 35234Republic of Korea Department of Surgery Chungnam National University HospitalDaejeon 35015Republic of Korea Laboratory of Veterinary Pharmacology College of Veterinary Medicine and Research Institute for Veterinary ScienceSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea

OBJECTIVE:Chemotherapeutic agents such as docetaxel(DTX)can trigger chemotherapy-induced peripheral neuropathy(CIPN),which is characterized by unbearable *** study was designed to investigate the analgesic effect and related neuronal mechanism of low-frequency median nerve stimulation(LFMNS)on DTX-induced tactile hypersensitivity in ***:To produce CIPN,DTX was administered intraperitoneally 4 times,once every 2 d,to male ICR *** was performed on the wrist area,and the pain response was measured using von Frey filaments on both hind *** blot and immunofluorescence staining were performed using dorsal root ganglion and spinal cord samples to measure the expression of brainderived neurotrophic factor(BDNF).RESULTS:Repeated LFMNS significantly attenuated the DTX-induced abnormal sensory response and suppressed the enhanced expression of BDNF in the DRG neurons and spinal dorsal ***:LFMNS might be an effective nonpharmaceutical option for treating patients suffering from CIPN via regulating the expression of peripheral and central BDNF.

关键词： analgesia brain-derived neurotrophic factor chemotherapy-induced peripheral neuropathy docetaxel nerve stimulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Computation on Velocity Field of the Post-flare Loop System of August 17, 1989

引用

天文研究与技术 1999年第S1期 414-418页

作者： Gu Xiaoma 1,2 , Dun Jinping 1, Zhong Shuhua 1 1 (Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China) 2 (United Laboratory of Optical Astronomy, The Chinese Academy of Sciences) (e mail:ssg@public. km. yn. cn)

The observational line of sight velocity fields of a large post flare loop(PFL) system on August 17,1989 were derived based on “multi cloud model” (MCM) method from the Hβ spectral data obtained with the two dimensional Multi Waveband Spectra Spectro Helio Graph (MW SSHG) at Yunnan Observatory. In order to explain the fundamental features of the velocity fields observed,an assumption and approximation to be taken into account that the matter within a loop system rises up from the loop foot to the loop top along the loop leg in a helical magnetic line under the combined action of solar gravity, magnetic stress and a gradient of atmospheric pressure in the loop system, and a theoretical velocity field of the loop system was calcuated with the aid of MHD theory. From a comparison of both velocity fields, it is found that the computed velocity field is basically similar with the observed one. It indicates that the assumption and approximation mentioned above are suitable basically.

关键词： sun post flare loops sun velocity field

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link

引用

Light(Science & Applications) 2022年第9期11卷 2207-2216页

作者： JAEWON YANG DONG IL lee DONG-CHEL SHIN JAEHYUN lee BYUNG SOO KIM HYUN JAY KANG YOUNG-JIN KIM SEUNG-WOO KIM Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Presently with Korea Research Institute of Standards and Science(KRISS) 267 Gajeong-roYuseong-guDaejeon 34113Republic of Korea

Stabilizing a frequency comb to an ultra-stable optical frequency reference requires a multitude of optoelectronic peripherals that have to operate under strict ambient ***,the frequency comb-to-comb stabilization aims to synchronize a slave comb to a well-established master comb with a substantial saving in required equipment and ***,we report an utmost case of frequency comb-to-comb stabilization made through a 1.3 km free-space optical(FSO)link by coherent transfer of two separate comb lines along with a feedback suppression control of atmospheric phase *** FSO link offers a transfer stability of 1.7×10-15 at 0.1 s averaging,while transporting the master comb,s stability of 1.2×10-15 at 1.0 s over the entire spectrum of the slave *** remote comb-to-comb stabilization is intended to expedite diverse long-distance ground-to-ground or ground-to-satellite applications;as demonstrated here for broadband molecular spectroscopy over a 6THz bandwidth as well as ultra-stable microwaves generation with phase noise of-80dBc Hz-1 at 1 Hz.

关键词： optical stabilization microwave

来源：

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

供碘对与怀孕有关的甲状腺功能的改善

引用

地方病译丛 1994年第4期15卷 29-32页

作者： Pede.,km 李桂云

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：