Consolidation and fragmentation in environmental scanning: A review and research agenda

Environmental scanning is a broadly defined concept, having first received attention from scholars in the late 1960s. Over the years a number of similar and overlapping constructs have emerged in management literature. The aim of this study, via a systematic review and thematic analysis of relevant empirical research, is to consolidate foundation environmental scanning knowledge, demonstrate how scanning research has developed and fragmented over time, and propose an agenda for future research. The first contribution of our review is a new typology of environmental scanning research made up of five discrete research views, which provides a more comprehensive and contemporary overview of the field than previous studies. The second is a proposed agenda for future research that explicitly acknowledges the role of technology, an area that is presently underdeveloped in foundation scanning literature. The third contribution is to signpost future directions for research on scanning and organisational performance using a number of theoretical perspectives. The overall outcome of our review is to move scanning research on from increasingly incremental contributions concerned with context to a place where the changing role of technology and the mechanisms through which environmental scanning contributes to competitive advantage can be more thoroughly understood.     

大学英语四级考试中快速阅读的答题技巧

快速阅读是大学英语四级考试在2006年题型改革之后新增设的一个题型,它是客观题的一个重要组成部分,也是考生感到很有难度的题目之一。快速阅读,顾名思义,它的目的在于测试考生单位时间内的阅读量,它要求考生在15分钟的时间内完成一篇1000-1200词左右的文章阅读以及文章后面的10道小题。如何在如此短的时间内完成这么长的文章阅读又要做对10道与文章内容紧密相关的考题,答题技巧是考生得分的关键。     

英语阅读效率的制约因由及克服措施

阅读能力是一种综合性的技能 ,培养学生较强的阅读能力始终是大学英语教学的首要任务。制约学生阅读速度的主要原因是多年养成的默读习惯。师生在教和学的过程中应不断改进方法 ,尽快提高快速阅读能力。     

用时域信息改善机扫雷达参数估计性能的方法

针对一个波束宽度内存在多目标的情况,提出了一种基于时空级联处理的用单天线、单接收通道实现目标角度和多普勒频率联合超分辨估计的方法.与阵列天线利用目标反射波的相位关系不同,单天线、单通道方法是根据天线扫描时,对回波脉冲的增益变化而构造导向矢量阵的,此时若直接采用常规空间谱估计方法,则实现的是信号多普勒频率的超分辨,角度估计效果较差.时空级联处理方法可充分利用信号的时域结构信息,明显提高角度的估计性能,并且无需高维搜索,计算量小.计算机仿真结果证明了新算法的有效性和正确性.     

TiNi和TiNiCu记忆合金薄膜的温度记忆效应研究

在形状记忆合金的相变过程中,如果温度升至TS后停止升温,并降温至马氏体相变结束温度Mf以下,则在下一次完全相变循环中出现动力学停顿,而这一动力学停止温度点与上次的停止温度密切相关,这一现象被称为温度记忆效应。该文通过示差扫描量热法对TiNi和TiNiCu合金薄膜进行一次或连续几次不完全相变,系统地研究了温度记忆效应。结果表明,不仅温度记忆效应是形状记忆合金固有现象,而且温度记忆效应与马氏体变体间的弹性能及母相和马氏体相之间的共格应变密切相关。     

多通道DNA测序仪的新型设计

目前大多数商品化的DNA测序仪的信号检测系统是基于CCD或PMT。基于CCD的系统需要对CCD进行制冷,其造价相对较高且灵敏度相对较低;基于PMT的系统使用机械扫描来实现多通道检测,其工作稳定性相对较低且工作的机械噪音大。本文提出了新型的DNA测序仪,它采用PMT共焦荧光系统,通过f-θ透镜和光学扫描来实现多通道并行检测。在此新系统中采用标准双链DNA样品:pBR322/HaeIII(使用TO染料)进行了毛细管电泳实验,测得系统的检测限可达:1.1841×10-11mol/L。新型DNA测序仪的工作机械噪声相比基于机械扫描的系统要低得多,且工作稳定性和灵敏度也很高。此系统可应用于基于激光诱导荧光的毛细管阵列和多通道微芯片的电泳检测。     

PATTERN RECOGNITION VIA ROBUST SMOOTHING WITH APPLICATION TO LASER DATA

Nowadays airborne laser scanning is used in many territorial studies, providing point data which may contain strong discontinuities. Motivated by the need to interpolate such data and preserve their edges, this paper considers robust nonparametric smoothers. These estimators, when implemented with bounded loss functions, have suitable jump‐preserving properties. Iterative algorithms are developed here, and are equivalent to nonlinear M‐smoothers, but have the advantage of resembling the linear Kernel regression. The selection of their coefficients is carried out by combining cross‐validation and robust‐tuning techniques. Two real case studies and a simulation experiment confirm the validity of the method; in particular, the performance in building recognition is excellent.     

英语阅读测试技能分析

在大学英语四、六级考试及其它英语测试中,阅读理解是极其重要的组成部分。如何运用英语综合知识和阅读技能快速获取所需信息、准确判定正确答案,是考试成功与否的关键。探讨阅读测试的常见题型、各类题型的答题策略,总结阅读解题的一般规律。     

扫描电路的相对时差

研究了简单式、自举式、密勒式和恒流管充电式四种扫描电路的相对时差与其电源利用系数、非线性系数的关系,并且阐明了扫描电路相对时差的实用价值.     

恒流管的非稳系数和改进系数

引入非稳系数和改进系数分析了四种恒流管充电式扫描电路的非线性系数和电源利用系数 ,并提出了改进恒流管充电式扫描电路性能的具体方法 .