射流泵式喷雾混药装置基本性能方程的确定

射流泵式喷雾混药装置能有效地进行药水的在线混合,达到药水分离的效果。本文对射流泵式喷雾混药装置进行了理论研究,提出了适用于背负式喷雾机的在线混合的混合机理,建立了射流泵式混药装置的基本性能方程,为设计、制造和改进射流泵式混药装置建立了理论依据和技术准备。     

绩效技术在师范生课堂教学技能训练中的应用

教学技能是师范生求职就业的考核重点。如何提高师范生教学技能训练的质量,本文把绩效技术的方法和模型引到课堂教学技能训练中来,旨在提高师范生课堂教学技能的训练绩效。     

Conceptions of giftedness and expertise put to the empirical test

Recent handbooks of giftedness or expertise propose a plethora of conceptions on the development of excellent performance but, to our knowledge, there are no comparative studies that provide empirical evidence of their validity to guide researchers and practitioners in their adoption of a particular conception. This study sought to close that gap by conducting an empirical comparison of the major approaches to giftedness and expertise currently in use: the IQ model, the performance model, the moderator model, and the systemic model. The four models were tested in a longitudinal study with a sample of N = 350 German students attending university preparatory schools; 25% of the sample had been assigned to special classes for the gifted. The construct and predictive validity of the four models were tested by means of structural equation modeling. Theoretical considerations along with our results indicated a differentiation among the models whereby some could only predict while others could also explain the emergence of excellent performance and thereby yield valuable information for the design of interventions. The empirical comparison of the approaches showed that they were unequally suited for the two challenges. For prediction purposes, the performance approach proved best while, for explanations, the moderator and systemic approaches were the most promising candidates. Even so, the latter did demonstrate conceptual and/or methodological problems. The IQ approach was superseded by the other approaches on both prediction and explanation. Implications and limitations of the findings are discussed.     

基于Unity3D的手机触屏类游戏关键技术研究与实现

随着高端智能手机的发展,触屏类手机游戏逐步成为新的娱乐方式.而对于触屏类手机游戏设计与交互性方面的研究成为新的热点.针对触屏类手机游戏开发中界面趣味性、人机交互性、操作灵活性等共性问题,基于Unity3D触屏事件处理机制,着重于快速完成自定义地形场景、模型动态显示及人工智能等关键技术的研究与实现,并基于Unity3D游戏引擎开发Android触屏类手机游戏,满足游戏场景真实性、趣味性及交互性,对触屏类手机开发具有一定的参考价值.     

超高性能混凝土的微观特征——应用统计纳米压痕技术表征

介绍纳米压痕原理,通过应用统计纳米压痕技术,表征超高性能混凝土的微结构,描述其微观机械特性.特别是,通过统计纳米压痕（SNT）、扫描电子显微镜（SEM）及X射线衍射（XRD）的研究发现,在界面区的纤维矩阵是无缺陷的.     

A retrospective look at replacing face‐to‐face embryology instruction with online lectures in a human anatomy course

Embryology is integrated into the Clinically Oriented Anatomy course at the Texas Tech University Health Sciences Center School of Medicine. Before 2008, the same instructor presented embryology in 13 face‐to‐face lectures distributed by organ systems throughout the course. For the 2008 and 2009 offerings of the course, a hybrid embryology instruction model with four face‐to‐face classes that supplemented online recorded lectures was used. One instructor delivered the lectures face‐to‐face in 2007 and by online videos in 2008–2009, while a second instructor provided the supplemental face‐to‐face classes in 2008–2009. The same embryology learning objectives and selected examination questions were used for each of the three years. This allowed direct comparison of learning outcomes, as measured by examination performance, for students receiving only face‐to‐face embryology instruction versus the hybrid approach. Comparison of the face‐to‐face lectures to the hybrid approach showed no difference in overall class performance on embryology questions that were used all three years. Moreover, there was no differential effect of the delivery method on the examination scores for bottom quartile students. Students completed an end‐of‐course survey to assess their opinions. They rated the two forms of delivery similarly on a six‐point Likert scale and reported that face‐to‐face lectures have the advantage of allowing them to interact with the instructor, whereas online lectures could be paused, replayed, and viewed at any time. These experiences suggest the need for well‐designed prospective studies to determine whether online lectures can be used to enhance the efficacy of embryology instruction. Anat Sci Educ 7: 234–241. © 2013 American Association of Anatomists.     

贵州傩文化发展现状综述

2012-2013年,贵州傩文化在展览与表演、经营与开发、传承与保护、调查与研究方面都取得了长足的进展,但仍存在许多不足,如经营与开发处于较低的层次,学术研究上没有国际性的傩文化学术研讨会和文化艺术节,相比上世纪九十年代的热闹景象显得有些冷清;保护方面有许多方法和措施需要进一步完善.但从整体上看贵州傩文化仍呈现出向前发展的趋势.     

减二线NMP抽出油同时制取芳烃油及裂化原料工艺研究

某炼油厂减二线NMP抽出油芳碳率高达51.84%,将此抽出油利用糠醛单溶剂再抽提,剂油比为3时重相油中芳烃质量百分含量在90%以上,芳碳率在70%以上,满足高芳烃油芳烃含量要求。利用糠醛+石油醚再抽提此抽出油效果比单用糠醛更好,在减二抽:糠醛∶石油醚=1∶1∶1和减二抽∶糠醛∶石油醚=1∶1∶2时,重相油中芳烃质量百分含量均在90%以上,芳碳率分别为74.65%和85.60%;重相油中糠醛含量比糠醛∶减二抽=3时少,蒸出溶剂耗能耗时较少。双溶剂处理后轻相油裂化性能均较处理前优化明显,在减二抽:糠醛∶石油醚=1∶1∶1时裂化性能更佳。     

Multi-objective comprehensive optimization of fuel consumption and emission for hybrid electric vehicles

Aiming to reduce fuel consumption and emissions of a dual-clutch hybrid electric vehicle during cold start, multi- objective optimization for fuel consumption and HC/CO emission from a TWC （three-way catalytic converter） outlet is presented in this paper. DP （dynamic programming） considering dual-state variables is proposed based on the Belhnan optimality principle. Both the battery SOC （state of charge） and the temperature of TWC monolith are considered in the algorithm simultaneously. In this way the global optimal control strategy and the Pareto optimal solution of multi-objective function are derived. Simulation results show that the proposed method is able to promote the TWC light-off significantly by decreasing the engine＇s load and improving exhaust temperature from the outlet of the engine, in comparison with original DP considering the single battery SOC. Compared to the results achieved by rule-based control strategy, fuel economy and emission of TWC outlet for cold start are optimized comprehensively. Each indicator of Pareto solution set shows the significant improvement.     

新型城镇化水平及其动力研究——以广西为例

根据新型城镇化的内涵,构建人口城镇化、经济城镇化、公共服务城镇化、基础设施城镇化以及城乡一体化5个维度,运用熵值法对广西2003-2012年的城镇化水平进行评价,并在此基础上用主成分回归对广西新型城镇化动力进行分析,结果表明:广西新型城镇化水平不断提升,其中经济城镇化水平提高最快;影响广西新型城镇化发展的主要动力依次为行政力、产业集聚力、市场力和外向力。