A Dynamic Comprehensive Method for Landslide Control

A slope failure is developed due to progressive external loads and deteriorations of slope geomaterials, thus forming a progressive and dynamic development and occurrence of landslides. Site geological properties and other active factors such as hydrodynamic load and human activities are complex and usually unknown, thus this dynamic development and occurrence of landslides can only be understood through the progressive accumulation of knowledge on the landslides. For such a progressive process, this paper proposes a dynamic comprehensive control method for landslide control. This control method takes full advantage of updated monitoring data and site investigations of landslides, and emphasizes the implementation of possible measures for landslide control at reasonable stages and in different groups. These measures are to prevent the occurrence of a landslide disaster. As a case study, a landslide project at the Panluo open-pit iron mine is analyzed to illustrate this dynamic comprehensive control method.

Characteristics of the interface of a laser-quenched steel substrate and chromium electroplate

The interface of a laser-discrete-quenched steel substrate and as-deposited chromium electroplate was investigated by ion beam etching, dissolving-substrate-away and using a Vickers microhardness tester, in an attempt to reveal the mechanism that the service life of the chromium-coated parts is increased by the duplex technique of laser pre-quenching plus chromium post-depositing. The laser quenching of the steel substrate can reduce the steep hardness gradient at the substrate/chromium interface and improve the load-bearing capacity of chromium electroplate. Moreover, the laser quenching prior to plating has an extremely great effect on the morphologies and microstructure of the substrate/chromium interface: there is a transient interlayer at the original substrate/chromium interface while there is not at the laser-quenchedzone/chromium interface; the near-substrate surface microstructure and morphologies of the free-standing chromium electrodeposits, whose substrate was dissolved away with nital 30% in volume, inherit the periodically gradient characteristics of the laser-discrete-quenched substrate surface. (c) 2006 Elsevier B.V. All rights reserved.

高温非平衡条件下氟原子亲电动力学的激波管研究(英文)

用激波管方法研究了氟原子亲电动力学.利用反射激波加热获得离子化气体,随后经冷却速度达106K/s的强稀疏波冷却,离化气体将经历以电子复合为主的非平衡过程.用Langmuir静电探针监测反射激波后离子浓度随时间的演变,分析了探针工作状态,引入了探针鞘层内的弹性散射修正.测定了温度在1200～2200K以氩气为碰撞第三体的F原子与电子复合速率系数,讨论了温度依赖关系.

Red-shift conical emission by femtosecond pulses at low input power

Red-shift conical emission (CE) is observed by femtosecond laser pulse propagating in BK7 at a low input power (compared to those input powers for generation of blue-shift CE). With the increasing input power the blue-shift CE begins to appear whereas the red-shift CE ring (902 nm in our experiment) disappears accompanied by the augment of the central white spot size synchronously. The disappearing of red-shift CE in our experiment is explained such that the increase of axial intensity is much higher than that of ring emission and the augment of the central white spot size with the increasing input laser power.

硬X射线相衬成像技术

介绍了近年来硬X射线位相衬度成像技术的发展状况，详细论述了X射线干涉相衬、衍射增强相衬，类同轴相衬等几种典型的成像原理。

激光诱导等离子体开关控制脉宽实验研究

利用激光诱导等离子体开关技术，在1064nm的Nd：YAG固体激光器上获得了脉宽4．4～6．4ns的短脉冲激光输出。激光电离空气产生的等离子体开关控制脉冲宽度时，聚焦透镜焦距越短，压缩后的脉宽越窄，但激光能量损耗越大。压缩后的激光脉宽与激光能量近似成双曲线关系。在控制脉宽光路的焦点处放置带孔的Cu薄片可抑制等离子体的扩散，得到了脉宽最短可达4．4ns的激光输出。

掺Yb^3＋的氧化镧钇透明激光陶瓷的光谱特性

采用传统陶瓷烧结工艺，在无压还原气氛中低温制备了Yb^3＋掺杂量高达10％（按摩尔计）的透明性良好的氧化镧钇激光陶瓷，研究了其在室温的吸收光谱、发射光谱以及荧光寿命。结果表明：掺Yb^3＋氧化镧钇透明激光陶瓷具有宽的吸收和发射光谱以及长的荧光寿命。吸收峰位于902，942nm和968nm处，吸收截面分别为0.31×10^-20,0.45×10^-20cm^2和0.53×10^-20cm2：主发射峰位于1032nm和1075nm处，发射截面分别为1.05×10^-20cm^2和0.87×10^-20cm ^

云南省HIV-1分子流行病学研究进展

云南省是中国HIV-1感染最早和最为严重的地区之一,流行的HIV-1病毒亚型种类复杂多样。已有证据表明国内其它地区的HIV-1亚型很可能主要来源于云南省。本文对云南省的HIV-1亚型的流行情况进行综述,希望能为预防控制云南省乃至全国HIV-1的流行以及合理设计HIV-1疫苗提供基础信息。

云南大山包黑颈鹤日间越冬时间分配和活动节律

2006年10月-2007年4月采用瞬时扫描取样法对云南省昭通市大山包黑颈鹤国家级自然保护区内越冬的黑颈鹤(Grus nigricollis)种群进行了越冬时间分配和日间活动节律的研究.取食是黑颈鹤越冬期间最主要的行为,占(53.05±4.93)%,其次为警戒(18.75±2.65)%、搜寻00.38±1.34)%和休整(10.32±4.93)%,其余行为依次为:行走(4.901±1.59)%、飞行(1.70±0.38)%、其他(0.55±0.41)%、争斗(0.36_±0.25)%.黑颈鹤的出飞时间与日出时间、飞回时间与日落时间分别具有显著的正相关和负相关关系.越冬期间黑颈鹤日间各时间段(1h)(09:00-18:00)和各月份间(2006.11-2007.03)行为差异极显著(P<0.05),并呈现出上午和下午取食双峰、中午休息高峰的规律性变化.气温高时黑颈鹤增加休整时间减少取食时间;气温低时则减少休整时间增加取食时间.偏相关分析说明:环境温度独立地对越冬时间分配产生影响,湿度通过温度对黑颈鹤越冬时间分配产生相反的影响.

大兴安岭达尔滨湖桥弯藻科(硅藻门)中国新记录植物

报道了采自大兴安岭达尔滨湖及其周围沼泽水体的硅藻门桥弯藻科中国新记录植物9种1变种,分别为新箱形桥弯藻新月变种Cymbella neocistulavar.lunataKrammer、近箱形桥弯藻Cymbella subcistulaKrammer、疏纹内丝藻Encyonema paucistriatum(Cleve-Euler)Mann、普通内丝藻Encyonema vulgareKrammer、尖锐弯肋藻Cymbopleuraacuta(Schmidt)Krammer、英吉利弯肋藻Cymbopleur