Environmental impact assessment of ecological migration in China: a survey of immigrant resettlement regions

Implementation of ecological migration (eco-migration) policies may improve the fragile ecological environment of emigration areas; however, it also places enormous pressure on the human-environment systems in immigrant resettlement regions. Via the application of participatory rural appraisal (PRA) methods, ecological footprint (EF), and stochastic impacts by regression on population, affluence, and technology (STIRPAT) models, 21 villages of Huanjiang County in Guangxi Zhuang Autonomous Region, China were used in this research as a case study area for the environmental appraisal of eco-migration policies in immigrant resettlement regions. Results show: (1) In the past 20 years of implementing eco-migration policies, the EF per capita constantly increased, the biocapacity (BC) per capita constantly decreased, and the ecological deficit gradually increased, indicating an extremely negative impact of eco-migration projects on the ecological environment in the immigration areas. (2) Cropland and forest land are the most important components of the per-capita EF. The per-capita EF of cropland experienced overall a first increasing and then decreasing trend, and the per-capita EF of forest land constantly increased and showed the most rapid increase among all types of EF in the last two decades. (3) The proportion of per-capita EF of different types of productive land is in the order of forest land > cropland > carbon uptake land > built-up land > grazing land from high to low, and this is a significant change from the original order of cropland > forest land > carbon uptake land > grazing land > built-up land. (4) Because of unequal possession of ecologically productive resources, the overall per-capita EF, overall per-capita BC, overall per-capita ecological deficit of productive land use by migrants, and their component values of different types of productive land use are all lower than the corresponding values of the natives. The ecological deficit of natives is more severe than that of migrants. (5) Whereas population growth and overexploitation of resources lead directly to the increased pressure on the ecological environment in the immigration areas, increasing nonagricultural income and improving the consumption structure can reduce the dependence of farmers on the land, thus inhibiting the increase of EF.     

移动虚拟校园(MVC)的构思与实践

移动教育已经成为现代教育技术应用的一个新方向，如何将移动计算技术应用于教育正在成为研究的热点。本首先探讨了移动计算技术的原理和特点，讨论了移动计算技术在校园建设中的作用，提出了移动虚拟校园（MVC）的概念，给出了其基本框架。同时，本还对该构架中的多项关键技术进行了研究并开发了多个实用的系统，并正在北京大学进行试用，目前运行效果良好。实践表明，移动虚拟校园在目前的技术条件下是可行的，并能发挥巨大的效益。     

从词汇的联想意义看商标名称翻译

商品经济的飞速发展使国际间的贸易往来日趋频繁。一国商品能否在其他国家迅速占领市场,与其商标名称能否为其消费者的心理所接受具有相当紧密的联系。本文通过对词汇联想意义理论价值的分析,指出词汇联想意义在商标名称翻译中的重要作用,并结合实例探究了商标名称翻译的有效途径。     

论王维诗歌中绘画技巧的应用

王维以山水诗而著称于世,同时他的绘画水平也很高;而且他还善于将绘画中的艺术造型手段诸如色彩、明暗、线条、构图、轮廓等应用到其诗歌的创作中,使其"诗中有画,画中有诗".     

动力髋螺钉和髁钢板治疗股骨粗隆间骨折

目的:观察两种股骨粗隆间骨折内固定术后疗效.方法:用国产Richard钉和髁钢板治疗不同股骨粗隆间骨折13例和15例.结果:平均愈合时间:动力髋螺钉组8周,髁钢板组9.9周.结论:内固定治疗股骨粗隆间骨折手术后早期功能锻炼安全可行,可使关节功能早期恢复,并可有效预防并发症.动力髋螺钉较髁钢板内固定更利于病人早期活动.     

“人的全面发展”内涵新析

把握“人的全面发展”内涵的实质,应确立两个理论前提:第一,“人的全面发展”在很大程度上是一种理想、一种追求、一种社会和人生的信念;第二,“人的全面发展”是一个相对的概念,而不具有绝对的意义。同时,“人的全面发展”还应包含四个层面的内涵,即完整发展、和谐发展、多方面发展、自由发展。     

抑制mTOR的抗肿瘤药物的研究进展

mTOR受体蛋白是真核细胞中存在的一种PIKK类的激酶,它在细胞分裂、分化、生存中起着核心的作用,对mTOR的抑制将使细胞停滞于G1期或使细胞凋亡。现在已经开发出来的mTOR抑制剂有雷帕霉素衍生物、吡咯并喹啉衍生物及色酮类衍生物,它们的活性研究表明mTOR抑制剂有望成为一类新型抗肿瘤药物。     

Proteiomic patterns for endometrial cancer using SELDI-TOF-MS

Serum samples from endometrial cancer (EC) patients and healthy females were analyzed using surface-enhanced laser desorption-ionization time-of-flight mass spectrometry (SELDI-TOF-MS) to discover the potential diagnostic biomarker for detection of EC. A preliminary training set of spectra derived from 40 EC patients and 30 healthy women were used to develop a proteomic model that effectively discriminated cancer patients from healthy women. The training set had a specificity of 100% and sensitivity of 92.5% in the EC detection. A blind test set, including 20 new cancer cases and 10 healthy women, was used to validate the sensitivity and specificity of this multivariate model, which had a corresponding results of 60% in specificity and 75% in sensitivity, respectively. The combination of SELDI-TOF-MS with bioinformatics tools could help find new biomarkers and establish the detection of EC with high sensitivity and specificity.     

当今全民健身之误区及对策

自1995年颁布全民健身计划至今已有五个年头，全民健身计划的实施即将进入第二期工程阶段。在第一期工程阶段已取得了有目共睹的成就，但从一些资料统计发现也存在着不少问题，为了更好的完成全民健身计划的第二期工程，有必要对前阶段的工作进行总结。本文就从此入手，通过对1995年到1999年有关全民健身计划的报道，找出第一期工程前阶段存在的问题，并提出解决问题的对策。