混交林地土壤物理性质与微生物数量及酶活性的研究

研究了枫香×樟树、楠木×尖叶杜英、椆木×海南红豆、格木×海南红豆、火力楠×阴香、枫香×米老排×降香黄檀、樟树×马占相思混交林林地的土壤物理性质与微生物数量及酶活性.各林地的容重、毛管孔隙、非毛管孔隙、自然含水量、毛管持水量的不同引起其保水性和通气性的差异.细菌是土壤微生物总量的主要组成者.各混交林地的细菌、真菌和放线菌的数量差异大.各混交林地的脲酶、过氧化氢酶和纤维素分解酶活性有一定的差异.放线菌与容重呈显著正相关,而与总孔隙呈显著负相关.脲酶与自然含水量、毛管持水量、毛管孔隙呈显著或极显著正相关.     

A new microscope stand for use with the LKB Ultratome III and cryokit

A method is described for estimating the number of blocked pore channels and pore density and spatial distribution by the staining of the exterior pore openings of unobstructed pores with uranyl acetate, and identification of them using backscattered electron atomic number contrast imaging in the scanning electron microscope.     

Prospects for remediating juveniles' adjudicative incompetence.

With the application of adjudicative competence requirements to adolescent defendants, there is a growing need for interventions to enhance the legal capacities of adolescents who are found to be incompetent. By reviewing developmental, clinical, and educational research, the authors discuss whether it is possible to enhance youths' legal capacities and, if so, what the most promising approaches may be. Psychoeducational interventions for youth are discussed, as well as the possibility of changing the demands of the juvenile justice system to try borderline-competent youth in juvenile court. The authors conclude that there is evidence to believe it may be challenging to enhance youths' legal capacities, particularly when youth have limited rational understanding and/or legal reasoning capacities, and when these deficits stem from developmental immaturity and/or mental retardation. A research agenda is proposed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Juvenile competence to stand trial evaluations: A survey of current practices and test usage among psychologists.

What is the current standard of practice for evaluations of juvenile competence to stand trial (JCST)? The present study surveyed psychologists regarding the practices used when conducting JCST evaluations. Respondents rated the importance of 17 elements that might be included in a JCST evaluation report. Of these elements, 7 were considered essential by 70% or more of respondents, with 9 additional elements rated as either essential or recommended. A majority of respondents felt that the use of psychological and forensic instruments was important. A list of tests used is provided, and the implications for the development of standards and policy are discussed to provide practitioners with additional knowledge that will help to further the state of the discipline. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于常规CMOS工艺的电子镇流器芯片设计

分析当前主流电子镇流器控制芯片的优缺点,提出了一种适用于功率在20W以下节能灯控制芯片的设计方案.采用常规的CMOS铝栅工艺.整个控制芯片由主芯片和高压管驱动两块芯片组成,两管间通过自举电容耦合.自举电容起的作用:(1)隔离高压(2)传输高压功率管的控制信号.此设计方案的难点是设计出符合上述设计要求的高压管驱动芯片.此款芯片采用6μm CMOS铝栅工艺模型,经仿真验证,现已通过MPW流片成功.测试各项指标都达到设计要求.     

基于XML的站内检索系统

为实现可以为单独的网站提供站内全文检索系统,采用独立于专门商业搜索引擎的lucene索引结构,在网站所有的文档基础上,首先使用xml转换技术建立文档的xml索引格式,抽取文档主题内容写入xml链表,索引过程基于伪xml的存储布局。该方法在检索效率和准确性上都有很明显的提高,并且扩展性好,在原来解析链的结构下可以直接增加新的解析模块。     

中厚板四辊轧机机架优化设计的遗传算法

针对中厚板四辊轧机机架以刚度为目标函数的优化问题,提出用遗传算法进行优化设计。用上、下横梁的高度和厚度、立柱的宽度和厚度及窗口的宽度和高度组成一个种群进行编码、繁殖、交叉等操作,并在计算机上实现编程运算。通过与用惩罚函数法所获得的最优解的比较,表明该算法在本优化设计中的有效性。     

武钢冷轧厂五机架连轧机过程控制计算机系统

介绍了武钢冷轧厂五机架连轧机过程控制计算机系统的组成和功能, 着重介绍了该系统的硬件、软件结构,以及应用软件的功能。     

Segment-constrained regression tree estimation of forest stand height from very high spatial resolution panchromatic imagery over a boreal environment

Mean stand height is an important parameter for forest volume and biomass estimation in support of monitoring and management activities. Information on mean stand height is typically obtained through the manual interpretation of aerial photography, often supplemented by the collection of field calibration data. In remote areas where forest management practices may not be spatially exhaustive or where it is difficult to acquire aerial photography, alternate approaches for estimating stand height are required. One approach is to use very high spatial resolution (VHSR) satellite imagery (pixels sided less than 1 m) as a surrogate for air photos. In this research we demonstrate an approach for modelling mean stand height at four sites in the Yukon Territory, Canada, from QuickBird panchromatic imagery. An object-based approach was used to generate homogenous segments from the imagery (analogous to manually delineated forest stands) and an algorithm was used to automatically delineate individual tree crowns within the segments. A regression tree was used to predict mean stand height from stand-level metrics generated from the image grey-levels and within-stand objects relating individual tree crown characteristics. Heights were manually interpreted from the QuickBird imagery and divided into separate sets of calibration and validation data. The effects of calibration data set size and the input metrics used on the regression tree results were also assessed. The approach resulted in a model with a significant R² of 0.53 and an RMSE of 2.84 m. In addition, 84.6% of the stand height estimates were within the acceptable error for photo interpreted heights, as specified by the forest inventory standards of British Columbia. Furthermore, residual errors from the model were smallest for the stands that had larger mean heights (i.e., > 20 m), which aids in reducing error in subsequent estimates of biomass or volume (since stands with larger trees contribute more to overall estimates of volume or biomass). Estimated and manually interpreted heights were reclassified into 5-metre height classes (a schema frequently used for forest analysis and modelling applications) and compared; classes corresponded in 54% of stands assessed, and all stands had an estimated height class that was within ± 1 class of their actual class. This study demonstrates the capacity of VHSR panchromatic imagery (in this case QuickBird) for generating useful estimates of mean stand heights in unmonitored, remote, or inaccessible forest areas.     

机电综合实验台-控制系统设计

分析了微机数控机电综合实验台的功能和系统组成,提出了实验台整体设计方案,重点阐述了实验台控制系统的工作过程及控制系统部分中接口模块的原理和设计。