23 resultados para 1276

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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建立了室内模拟库水浸泡后滑坡体内水润湿的渗流实验装置,根据清江茅坪滑坡的地形、地貌以及岩土混合比例,填制了岩土体实验模型.模拟了水位在涨至模拟坡体凌空面一半高度和水位漫过凌空面达到第一平台高度时,坡体内的水分布情况.在水位降落实验过程中,岩土体部分失稳,证明了润湿滞后在降水期滑坡中起主要作用.

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We have developed a two-stage Ti:sapphire amplifier system which can produce 17-TW/23-fs pulses at a repetition rate 10 MHz. A birefringent plate is used in the regenerative amplifier to alleviate gain narrowing, while an all-reflective cylindrical-mirror-based pulse stretcher and an acousto-optic programmable dispersive filter (AOPDF) are used to compensate for the higher order dispersion of the system.

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介绍并对比了用于高功率激光核聚变的硅酸盐、磷酸盐、氟磷酸盐掺钕玻璃;介绍了玻璃成分与光谱及激光参数的关系,以及非线性折射率和钕离子^4F3/2→^4I11/2能级对不同玻璃成分中的受激发射截面、荧光寿命的影响;此外还对大型激光玻璃的特殊工艺——磷酸盐激光玻璃的连续熔炼工艺、除水工艺和除铂工艺原理作了讨论。

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A specific blood coagulation factor X activator was purified from the venom of Ophiophagus hannah by gel filtration and two steps of FPLC Mono-Q column ion-exchange chromatography. It showed a single protein band both in sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and alkaline polyacrylamide gel electrophoresis. The mol. wt was estimated to be 62,000 in non-reducing conditions and 64,500 in reducing conditions by SDS-PAGE. The isoelectric point was found to be pH 5.6. The enzyme had weak amidolytic activities toward CBS 65-25, but it showed no activities on S-2266, S-2302, thrombin substrate S-2238, plasmin substrate S-2251 or factor Xa substrate S-2222. It had no arginine esterase activity toward substrate benzoylarginine ethylester (BAEE). The enzyme activated factor X in vitro and the effect was absolutely Ca2+ dependent, with a Hill coefficient of 6.83. It could not activate prothrombin nor had any effect on fibrinogen and thus appeared to act specifically on factor X. The procoagulant activity of the enzyme was almost completely inhibited by serine protease inhibitors like PMSF, TPCK and soybean trypsin inhibitor; partially inhibited by L-cysteine. Metal chelator EDTA did not inhibit its procoagulant activity. These results suggest that the factor X activator from O. hannah venom is a serine protease.

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1989—1991年与日本京都大学合作,对我国南部狭腹胡蜂区系、生态、行为学等方面进行了研究。本文主要报道狭腹胡蜂的生物学与地理分布。研究结果表明狭腹胡蜂的栖息和巢室建筑分野外和住宅两种环境。密侧狭腹胡蜂Parischnogaatermellyi(Sau.)的蜂巢密度在30—100m2之间的住户内,平均为8.25巢,最高16巢,最低为2巢。巢室材料分植物纤维和土两类。在东径9915’一10498,北纬20 06’-22 55,之间范围内,除分布在海拔1000m以上类群外,一年四季都可进行活动,无越冬现象、分布范围最北限止于贵州东北部。

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测定了来自黄河上游和柴达木盆地托索湖的裸裂尻鱼共16个个体的Cytb基因全序列(1141bp),探讨了种群结构和遗传多样性。用MEGA2.1软件分析了碱基组成和序列变异;以青海湖裸鲤、花斑裸鲤和极边扁咽齿鱼为外类群,用PAUP*4.0b10程序构建了单倍型NJ树;用Arlequin Ver.2000程序计算了群体间遗传变异值(Fst)和Nm值以及群体分化概率值。结果显示,来自柴达木水系托索湖的裸裂尻鱼没有形成单系群,Fst=0.204(P<0.05),Nm=1.95。初步判断,黄河和柴达木水系托索湖的裸裂

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从增加笔式用户界面的可用性和提供自然、方便的交互操作的角度,提出一种使用场景树的界面设计方法,并将该方法用于管理会议系统相关环节,包括会议过程、查询和阅读会议文档、记录等.

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为了加速日本、华北落叶松的遗传改良进程,缩短育种周期,本文建立了用于早期选择的年遗传增益最大模型 (MAGG) 和最大未来净值模型 (MFNW)。遗传力平方根比率(g)、幼-成龄遗传相关系统(r) 和遗传预测系数等参数可用8种随时间函数来逼近,根据残差平方和与非线性回归相关指数,以二次抛物线式拟合的精度最高。不同模型利用的评价标准及参数逼近的函数不同,估算的最佳选择年龄 (tmax) 也不同。对于 MFNW模型,tmax的确定受生物学因子和经济学因子的共同影响。估算的结果表明,日本、华北落叶松的早期选择都是有效的。如果轮伐期(T)为20年,考虑改良的性状为材积,对于日本落叶松可用早期的树高作为选择指标,初选在2龄进行,第二次选择在7-8龄,早期选择的相对效率 (RSE) 分别为 14.2037 和 2.5017-1.9378;对于华北落叶松,当用树高作为早期选择指标时,第一次选择在3龄 (RSE=3.1711),第二次选择在 9-10 (RSE=1.5492-1.4561),当用树高年生长最作为早期选择指标时,第一次选择在4龄 (RSE=1.1276),第二次选择在 7-8 (RSE=1.3343-1.3436)。本文对不同轮伐期的tmax和其他性状的早期选择也作了探讨。

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IEECAS SKLLQG

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