矿山开采对生态系统涵养水分功能的影响分析

结合实例,从土壤蓄水能力角度定量分析矿山开采对藤桥西河流域生态系统涵养水分功能的影响,并使用影子价格法对其造成的经济损失进行定量估算。研究结果表明,矿山开采造成的涵养水分损失占藤桥西河流域生态系统土壤涵养水分比例较小,折合经济损失约为16.28万元/年。金洲城钼矿开采对藤桥西河流域生态系统涵养水分功能不会造成较大影响,项目建设从此方面论证可行。     

基于CUDA的细分曲面阴影体算法

为了在虚拟现实、电脑游戏等图形应用中更快速生成和实时绘制细分曲面的阴影,提出采用CUDA架构的GPU阴影体生成算法.该算法采用基于CUDA的曲面细分算法,通过CUDA共享内存结构使表面细分过程更加高效.采用基于CUDA的阴影体算法产生阴影轮廓线以及拉伸出阴影体.通过基于CUDA的流式缩减算法对阴影体数组进行压缩.通过优化CUDA和OpenGL的互操作,将绘制过程从以往算法的3步减少为2步.该算法在具有CUDA硬件的标准PC上进行测试.实验结果表明,与之前的GPU的算法相比,该算法可以生成更复杂细分曲面的阴影体,阴影体数组占用显存空间降低到2％以下,并可获得高达4倍的绘制速度提升.     

Qualitative research and its role in play therapy research.

The role and value of qualitative research for play therapy is the focus of this article. The premise is that qualitative research is a natural extension of the therapeutic process and thus can make a contribution to play therapy in the development of models and theories that will lead to future research and development. Qualitative research is placed within the context of current issues related to research in play therapy. The characteristics of qualitative research are presented and linked to the therapeutic process. Suggested research questions appropriate for qualitative inquiry are suggested. We can use qualitative research to build our understanding of the therapeutic process and the relationships in therapy helping to construct a model of change and a theory of growth change within play therapy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Two case studies of child-centered play therapy for children referred with highly disruptive behavior.

This article presents two cases with strong evidence measures in which child-centered play therapy (CCPT) was provided for children referred for highly disruptive behavior, including attention problems and aggression. Apparent progress was evidenced on the Teacher Report Form (TRF) of the Child Behavior Checklist (Achenbach & Rescorla, 2001). One client had a waiting period equal to his treatment period in which ratings were stable before change across his treatment period. The cases provide opportunities to consider how CCPT may work differently for similar behavioral difficulties in individual children. Researchers conceptualized each client's areas of difficulty and apparent treatment effects as an expert panel, aided by indications from the TRF. Individual discussions are provided regarding rationales for apparent progress and why CCPT seemed to have been effective. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Child parent relationship training: Parents' perceptions of process and outcome.

Child Parent Relationship Training (CPRT) is a play-based parent consultation model designed for children (ages 3–10) who may be struggling emotionally or behaviorally. CPRT aims to help parents develop empathy and appreciation for their children, increase parenting ability and confidence, and strengthen parent–child relationships. To date, the majority of CPRT studies have been quantitative in nature. There has been limited research on the effectiveness of CPRT using qualitative methodologies, but existing qualitative studies show promising results. The current study utilized an ethnographic approach to examine the acceptability and perceived effectiveness of CPRT. Findings indicated that the parents perceived the CPRT model to be both acceptable and effective (e.g., increased knowledge and confidence in parenting, enhanced parent–child communication, strengthened parent–child relationships, and reduced behavioral problems among child participants). Limitations of the study and implications for future research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

减速器齿轮与轴过盈配合选取的分析

抽油机减速器齿轮与轴过盈配合的选取不当是造成减速器串轴和齿轮冲击的直接原因,精确确定过盈量是减速器设计的关键。以26B型减速器为例,根据额定扭矩计算所需的过盈量并和当前所选的过盈量进行比较,对其不合适的配合进行了修改,最后依据修改后的过盈配合计算出热装时工件的加热温度,从而减少用电量、节约成本。     

双馈风力发电系统3次功率脉动的研究

为研究风剪、塔影效应引起的转矩3次脉动对风力发电系统的影响,设计了包含风剪、塔影效应的风机动态模拟器,提出了转矩指令动态补偿的转矩模拟方案,并建立了整个双馈风力发电系统对拖模拟平台。依据等效风速原理,对风机的风剪、塔影效应进行了定量分析与模拟,详细研究了由于风剪、塔影效应引起的3次转矩脉动量对双馈风力发电系统的影响。仿真结果验证了文中理论分析的正确性和有效性。     

卫星信道三状态Markov模型设计与仿真

为研究大气空间环境对卫星通信的影响,将卫星通信的天气状况分为晴朗天气、云雾天气、雨雪天气3种情况,分析不同天气状况下的卫星信道传播特性并建立相应的Rice分布模型、C.Loo分布模型和Suzuki分布模型,引入三状态Markov过程实现因天气变化造成的信道状态的转换,构成卫星信道三状态Markov模型并对该模型的统计特性进行分析。最后,采用正弦波叠加法并利用实测气象卫星云图数据对该卫星信道三状态Markov模型进行仿真实验。仿真结果表明,所建模型可以用来模拟实际的卫星信道传播特性。     

真实感雪场景模拟

在分析现有的降雪和积雪模拟方法的基础上,提出了一种新的粒子属性设置方式,对降雪过程的绘制速度进行了优化,并且创新性地运用阴影形成原理,模拟了风力较为稳定的条件下,建筑物背阴处的积雪情况。将降雪和积雪过程看成是两个独立的阶段,分别采用不同的方法进行模拟。降雪方面,主要是采用了粒子系统,为粒子添加了纹理样式这一属性,并运用了显示列表等优化技术,使得绘制效率得到了显著提高;积雪方面,引入噪声技术,并结合多级粒子系统,再现了现实生活中背阴处无积雪的情况。实验表明,模拟方法效果逼真,实时性良好,适合应用于需要进行实时渲染的虚拟环境。     

黎凡特盆地油气地质特征与勘探方向

基于地质-地球物理资料和最新的油气勘探成果,应用石油地质综合研究方法和成藏组合快速分析技术,研究了黎凡特盆地的油气成藏特征,划分了成藏组合并分析了其成藏模式,探讨了盆地未来的勘探方向。盆地经历裂谷期、被动大陆边缘期、构造反转期3期构造演化。以中新统、上新统和中生界储层为核心,划分为3套成藏组合。中新统成藏组合最重要,渐新统-中新统生物成因气、古尼罗河大型水系盆底扇浊积砂岩优质储层、构造反转期形成的大型构造圈闭和墨西拿阶盐岩区域盖层的良好配置是油气富集的关键;上新统成藏组合表现为中小型海底峡谷水道浊积砂岩控藏,油气近源成藏;以白垩系碎屑岩及侏罗系生物礁潜在储层为核心,推测深水区发育中生界成藏组合。三者为未来重点勘探方向,深水区中新统和深层中生界是最有潜力的领域。