澎溪河不同高程消落带土壤磷的吸附特性

消落带土壤磷吸附特性对库区水体的营养状态有重要影响。为研究不同高程消落带土壤磷吸附特性,选取了三峡库区澎溪河流域双江140,145,155,165,180m高程土壤,进行磷等温吸附热力学试验,并探讨了不同高程消落带土壤磷吸附特性差异的原因。结果表明,随着高程的降低,消落带土壤吸附解吸平衡浓度EPC和磷最大吸附量Qmax逐渐增加,即磷吸附能力增强。结合消落带土壤颗粒表面特性分析、吸附特征参数与理化性质相关性分析的结果,认为消落带土壤具有较小的粒径分布,较高的有机质含量和Fe含量是影响不同高程消落带磷吸附能力的重要原因,且主要受到冬季淹水沉积和夏季降雨侵蚀的影响。低高程消落带土壤具有较强的磷吸附能力,对于控制库区水体富营养化具有一定的积极意义。     

基于GPS芯片的重力加速度测量仪

根据纬度和海拔高度对重力加速度的影响,通过GPS芯片测量,得到高精度的重力加速度值。该仪器具有制作简单,测量精度高,操作方便,价格低廉等优点。     

关于单形旁切球半径的一类几何不等式

Demir-Marsh不等式给出了三角形的旁切圆半径和其对应高之间的关系，将Demir-Marsh不等式在n维欧氏空间E^n中进行推广和改进．     

cDNA cloning and expression of erythropoietin in the plateau zokor （Myospalax baileyi） from the Qinghai-Tibet Plateau

All organisms respond to variation in their environments and manage environmental stress through metabolic adjustments.The plateau zokor(Myospalax baileyi) is an endemic and keystone subterranean rodent species that inhabits the Qinghai-Tibet Plateau between 2800 and 4200 m above sea level.It is a hypoxic-tolerant mammal with a high ratio of oxygen utilization that enables it to cope with its harsh surroundings.To explore the molecular mechanism of altitude acclimatization of the plateau zokor,we cloned the zokor erythropoietin(Epo) gene and used real-time PCR to compare Epo mRNA levels in zokors inhabiting 16 different altitudes.The full-length zokor Epo open reading frame was 579 bp that encoded a precursor peptide of 192 amino acids with a signal peptide of 26 residues.The Epo gene of the plateau zokor was 81%-95% homologous to that of human,mouse,rat,root vole and the Golan Heights blind mole rat,with the highest homology(95%) to species of the genus Spalax.Epo mRNA was detected mainly in the zokor kidney and spleen among 8 selected tissues.The level of Epo mRNA increased in the liver and kidney with increases in altitude.The increase in the kidney was 5 times that in the liver.Remarkably,expression of Epo mRNA in the kidney of zokors living at the highest altitude(4268 m) was 12-fold higher than that of zokors living at the lowest(2492 m) altitude.These findings provide essential information for understanding the possible role of Epo in adaptation to hypoxia in the plateau zokor.     

The effect of altitude on arid inselbergs along a bioclimatic gradient

Twenty-four inselbergs in four distinct landscapes along a biogeographic gradient from mesic winter rainfall in the southern Namib to arid summer rainfall in the northern Namib were analysed. Declining similarity of vegetation between matrix (surrounding plains) and inselbergs with altitude were exhibited in most inselbergs, irrespective of biogeographic region, rock types and height above surroundings. Some inselbergs showed the least congruence with matrix vegetation on upper slopes, others with the top of inselbergs. This is probably related to the nature of the individual inselbergs, e.g. with steep cliffs in the upper reaches supporting plant species adapted to more mesic conditions. Most trends of declining similarity between matrix and inselberg habitats were maintained across the investigated bioclimatic regions. Even low inselbergs clearly supported vegetation very distinct from the surrounding area. Their contribution to species richness of a landscape is therefore unquestionable and adequate protection of such landscapes is needed where human impacts are severe.     

高原耐力性项目运动员在高海拔交替训练期间的疲劳及恢复程度的监测研究

本文通过对运动员进行主观体力强度感觉等级（RPE量表）监测,就海拔2260m和3150m交替训练对运动员疲劳及恢复程度的影响作初步研究．监测对象是世居高原的耐力性项目的运动员,监测为期四周共八次．监测结果表明;世居高原的耐力性项目的运动员在不同海拔地区交替训练,其疲劳及恢复程度的变化在训练初期波动较大,在训练后期逐步稳定在一个适宜的水平．因此建议在安排不同海拔地区交替训练时,在训练初期,要注意运动强度的科学安排,力求做到循序渐进．     

基于CMOS准浮栅技术的超低压模拟集成电路

基于多输入浮栅MOS晶体管的分析,系统研究准浮栅MOS晶体管的工作原理、电气特性及等效电路,计总结其用于超低电压模拟电路设计的优势。基于CMOS准浮栅技术,提出了0．8V两级运算放大器和1V 2．4 GHz Gilbert混频器电路,并采用TSMC 0．25 μm 2P5MC MOS工艺的Bsim3V3模型完成了特性仿真,仿真结果显示了准浮栅技术用于超低电压模拟电路设计的优势。     

主动性人格对高海拔铁路施工人员安全行为的影响

为提高高海拔铁路施工人员安全行为,从人格特质的角度出发,选择与工作环境密切相关的主动性人格特质为前因变量,基于特质激活理论和社会认同理论,引入组织认同和领悟社会支持为中介变量和调节变量,揭示主动性人格影响安全行为的作用机理。为避免共同方法偏差带来的影响,采用一种分阶段收集数据的方法,使用主动性人格和安全行为的成熟量表,以甘肃、青海和西藏在建的川藏铁路和西成铁路高海拔施工区域10个项目部的一线施工人员为研究对象进行问卷调查,获得308份有效问卷;运用SPSS 22.0和process v3.3进行共同方法偏差检验、验证性因子分析、相关性分析和验证假设。结果表明：主动性人格对高海拔铁路施工人员安全行为具有显著的正向预测作用;组织认同在主动性人格和安全行为影响关系中起部分中介作用;领悟社会支持在主动性人格和安全行为影响关系中起正向的调节作用。研究结果丰富了人格特质心理学在工程实践中的应用,为提高施工企业的安全管理水平提供了建议。     

幼儿前期男性血红蛋白参考值与海拔高度的曲线模型分析

为制定中国幼儿前期男性血红蛋白参考值的统一标准提供科学依据.收集了中国45个单位用氰化高铁血红蛋白(H iCN)法测定的5 429例健康幼儿前期男性血红蛋白参考值,用曲线回归分析的方法,研究其与海拔高度之间的关系.结果发现:随着海拔高度的逐渐增高,幼儿前期男性血红蛋白参考值按指数律也在逐渐增大,相关性很显著(R=0.565,F=20.21,P=0.0001);推导出了一个指数曲线模型:Y^=116.0 e0.00004679X±15.9.并依据幼儿前期男性血红蛋白参考值与地理因素的依赖关系,把中国分为青藏区、中部区、东部区.     

一款新型超低功耗可控增益放大器的研究与设计

设计了一种新型超低功耗可控增益放大器,对其构成及工作原理进行分析。考虑到不同于常用的可控增益放大器,设计需要满足系统在恶劣环境下稳定运行;且系统超低功耗的要求。因此对可控增益放大器采用了休眠-唤醒机制、高线性度电阻衰减电路以及亚阈值电路设计方法;并通过搭建仿真平台对设计的可行性进行验证。仿真结果表明,接收器可在温度-40℃—125℃,电源电压2.3 V—5 V的环境下可靠工作,且在该工作范围内超低功率运行。