oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

匹配条件: “<br>杜水生” ,找到相关结果约246916条。
列表显示的所有文章,均可免费获取
第1页/共246916条
每页显示
中国北方早期智人与直立人对环境适应性比较研究―――L2时期的环境变化对人类演化的影响
水生
东南文化 , 2002,
Abstract: ????直立人与早期智人在石器类型上的相似性反映了它们所处的相似的地质背景为他们提供了相似的石料;而在打片技术、用火等方面的差异可能反映了它们在适应环境能力上有一定的区别;和早期智人相比,直立人采用的适应方式可能要消耗更多的资源。L2时期恶劣的气候变化可能是直立人演化为早期智人的原因之一。
RE-EXAMINATION OF THE AGE OF BEIYAO SITE,LUOYANG CITY
洛阳北窑遗址年代再研究

Du Shuisheng,Yang Lirong,Liu Fuliang,Ding Zhongli,<br>水生,杨丽荣,刘富良,丁仲礼
第四纪研究 , 2011,
Abstract: Beiyao Site is situated in the third sequence of Chanhe river,one branch of Luohe river.There are more than 20 meters loess-paleosol formation which contains a large number of stone artifacts pile up along the southern bank of Chanhe river.Based on field observations,the well-developed loess formation in the site is described top-down as follows:1.Tillage soil and disturbance of soil, with thickness of 0.3~0.4m.2.Brown-red paleosol layers, faded from top to bottom,it is obvious that the upper half was destroyed,with thickness of 0.55~0.65m.3.Pale yellow loess, with thickness of 6.4~7.0m.According to two weakly developed soils,the layer can be divided into five smaller layers,contain a few stone artifacts.3-1.Loess layer,the soil contains more calcium silk and calcium nodules,thickness is 1.2~1.6m;3-2.paleosoil,the upper part contain more calcium nodules,the lower part is reddish-brown,dense soil structure,but clearly weaker than the first two layers.0.8m in thickness;3-3.Loess,porous structure,contain calcium silk and calcium tuberculosis,with thickness of 0.9~1.2m;3-4.paleosoil,soil structure is dense block,there is 20cm of clear developed soil in the middle,thickness is 0.8~1.0m;3-5.Loess,loose structure,light yellow,and containing calcareous silk and calcium nodules in the lower part,2.4m thick;4.The red-brown paleosol, Fe-Mn film developed,calcium tuberculosis is rare,unearthed a large number of stone artifacts,with thickness of 2.2m.5.Pale yellow loess, there are calcium tuberculosis in the bottom,few stone artifacts were unearthed,with thickness of 2.4m.6.Dark greyish yellow loess, unearthed stone artifacts,with thickness of 2.2m.7.Dark brown red paleosoil, the best-developed soils,scaly structure,black Fe-Mn film developed,unearthed a large number of stone artifacts,a thickness of 2.0m.In the course of archaeological excavations,we collected a set of loess samples with 10cm spacing,measured magnetic susceptibility and grain size data in the Sedimentary Laboratory of Institute of Geology and Geophysics,Chinese Academy of Sciences.Fig.2 is the spliced magnetic susceptibility data of Beiyao section compared with Duanjiapo section and deep-sea oxygen isotope curves.From Fig.2 we can see that loess magnetic susceptibility curve of Beiyao section corresponds to Duanjiapo section and deep-sea oxygen isotope curve.First of all,the magnetic susceptibility of Beiyao section has 3 peaks,which is respectively 169.8×10-8 m3/kg,158×10-8 m3/kg and 224.5×10-8 m3/kg,There are also three peaks in Duanjiapo section and deep-sea oxygen isotope curve.Secondly,the morphology of Beiyao curve has two-peaks-three-valleys structure between the first and second peaks,second and third peaks.The same pattern is also present in Duanjipo section and marine isotope curve,so we can correspond three peaks respectively to S1,S2,S3 or Layer 2,4,and 7 in field section.In addition to collecting loess samples,we also collected seven thermoluminescence samples and two 14 C sampl
CATHODIC PROTECTION BEHAVIOR ON RUSTED CAST IRON SIMULATING IRON ARTIFACTS
模拟文物铸铁的阴极保护行为

ZHANG Yancheng,HE Jiquan,WU Yinshun,HAN Rubin,<br>张艳成,何积铨,吴荫顺,韩汝玢,刘永生,水生
腐蚀科学与防护技术 , 1997,
Abstract: For understanding the behavior of the aging iron artifacts under cathodic protection thick rust layers were prepored on the simulating iron casts and then the effect of the thick rust layers on the behavior of the cast iron under cathodic protection has been invistigated. The results showed that cathodic current density was controlled by the unsteady state diffusion step in the early period of CP, which made the required cathodic current density larger than that for the bare cast iron at the same conditions for a long time. And when tending to the steady state, it had the same level as that for the bare cast iron over a long time.
FULL-WAVE ANALYSIS OF ELECTROOPTIC MODULATOR STRUCTURES
波导电光调制器结构的全波分析

QiSongxin,<br>戚颂新,水生
光子学报 , 1996,
Abstract: In this paper,the application of FDTD method to the propagation characterization of electrooptic modulator structures is demonstrated,and the moving absorbing boundary condition and autoregressive model are first proposed to approve the computation accuracy and efficiency of the FDTD method.Test results indicate the important relationship of the structure parameters and the characterization of electrooptic modulators.
铝合金轴对称法兰件热挤压成形极限的理论分析
之明,丛森,柳君,秦晋,水生
材料工程 , 2011,
Abstract: 对铝合金轴对称零件热挤压成形进行了理论分析,总结出零件成形极限的影响因素及规律.通过建立法兰类轴对称零件在热挤压成形过程中变形区应力计算的力学模型,得出应力变化和法兰区外径最大尺寸的表达式.并通过不同应力状态下临界尺寸表达式的对比,分析径向压力P、材料与模具之间的摩擦力τ以及法兰区厚度t对法兰区外径最大尺寸Rmax的影响规律,为实验过程中成形极限的预测提供一定理论依据.
河南栾川旧石器时代晚期龙泉洞遗址石制品初步研究
周立,李璇,庞海娇,水生
第四纪研究 , 2011, DOI: 10.3969/j.issn.1001-7410.2011.06.04
Abstract: 龙泉洞位于河南省栾川县的龙泉山公园内,是一处旧石器时代晚期洞穴遗址,年代为33~31kaB.P.,地理坐标为33°47′24″N,111°36′28″E.2011年2~4月,由北京师范大学、洛阳文物工作队和栾川县文管所共同发掘。出土了512件石制品(有编号),其中包括石核96件,石片60件,工具73件,断片58件,断块225件。另外,淘洗时出土了大量的碎块和碎屑。石制品的主要原料为脉石英,使用锤击法和砸击法打片;锤击石片中,长宽相当的石片占多数,有近30%的似石叶石片;工具以刮削器为主,也有少量的尖状器、锥、钻、雕刻器等。龙泉山遗址是伏牛山区第一次经过科学发掘和研究的旧石器晚期遗址,它的发现为我们全面认识中国旧石器晚期文化的面貌和现代人行为特征提供了重要资料。
河南卢氏发现黄土旧石器
水生,刘富良,朱世伟,张民
第四纪研究 , 2008,
Abstract: 文章报道了在河南卢氏发现的3个旧石器地点:石制品出自S1的Ly15地点;在S3,S2和S1中均有旧石器发现的Ly13地点;出自S2的Ly14地点。3个地点的石制品均以石英岩砾石为原料,锤击法打片,石器数量较少,有手镐、刮削器,这些发现为探索中国南北旧石器文化的关系及其与环境变化的关系有重要意义。
THE FUZZY CLUSTER STUDY ON THE DIVISION OF NATURAL VEGETATION TYPES OF CASTANOPSIS KAWAKAMII NATURE RESERVE IN SANMING,FUJIAN
用模糊聚类探讨福建三明格氏栲自然保护区植被类型的划分

You Shuishen,Guo Zhenting,<br>游水生,郭振庭
植物科学学报 , 1994,
Abstract: It is now known that there are 1010 species( varieties)of seed plants in the Castanop sis kawakamii nature reserve in Sanming,Fujan,which belong to 434 genera and 145 families,In general,its origin is rather ancient.The analysis of floristic geographic elements indicated that the percentages of pan-tropical and tropical elements are high.The result of the fuzzy cluster analysis showed that the division of formation is in agreement with the method of the important value of each species in its vegetation layer identified by the dominant species in each vegetation layer.Nature vegetation 3formation:1.Form.Castanop sis kawakamii,2.Form.Castanop sis carlesii,3.Form.Castanopsis fargesii.Planted vegetation 5 formation:1.Form.Pinus massoniana,2.Form.Cunninghamia lanceolata,3.Form.Fokienia hodgnsii,4.Form.Phoebe bournei,5.Form.Phllostachys pubscens.
CHAOTIC COMMUNICATION SYSTEM BASED ON SLOPE MODULATION
基于斜率调制的混沌通信系统

Cai Xinguo,Qiu Shuisheng,<br>蔡新国,水生
电子与信息学报 , 1999,
Abstract: In this paper, a new method of communications using chaotic signal is presented. This method is that the slope of the non-linear resistance in Chua's circuit is modulated with the input signal. At the receiving end, the signal is demodulated using the inverse course. Finally, the basic circuit and simulation result are given.
EQUIVALENT SMALL PARAMETER METHOD FOR TRANSIENT ANALYSIS AND ITS APPLICATION IN PWM SWITCHING CONVERTERS
适于瞬态分析的等效小参量法及其在PWM开关变换器中的应用

Lin Botao,Qiu Shuisheng,<br>林波涛,水生
电子与信息学报 , 1997,
Abstract: An improved perturbation technique (equivalent small parameter method) proposed in a recent paper (Int. J. Electronics, 1989, 67(3): 403-414) has been successfully applied to steady-state analysis of DC-DC PWM switching converters. This paper extends the algorithm to transient analysis of a broader class of non-linear systems. As an example, the transient respoase of a PWM switching converter is analyzed to demonstrate its simplicity and accuracy.
第1页/共246916条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.