Heat transfer mechanism of a swirling impinging jet in a stagnation region

Heat transfer characteristics of a swirling impinging jet have been experimentally examined using a combined particle image velocimetry (PIV) and laser‐induced fluorescence (LIF) technique for simultaneous measurement of velocity and temperature fields. The present study shows that the radial width of the jet stretches with increasing swirl intensity, and that the stretching phenomenon contributes to the maximum local heat transfer coefficient. At the stagnation region, the flow near the heated surface is mixed intermittently by reverse flows toward upstream, and spatial distributions of temperature are correlated with instantaneous velocity vector maps. The dynamic behavior of recirculation zones, attributed to swirl number Sw and impinging distance, mainly determines the turbulent heat transfer at the stagnation region. © 2003 Wiley Periodicals, Inc. Heat Trans Asian Res, 32(8): 663–673, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10120     

曙光油田超稠油井套管损坏的机理和防治

超稠油特殊的油藏特点决定了其生产周期短、注汽频繁、出砂、汽窜、超覆现象严重，以及套管质量等因素的影响，套管损坏较为严重。对曙光油田超稠油井套管损坏的规律和机理进行了研究，并从钻井和完井工艺的完善、套管钢级和射孔工艺的选择、采油生产参数的确定、注汽管柱隔热效果的提高、防治砂工艺等方面，对套管损坏提出了预防措施和对策。并对套管损坏井制定了修复再利用方案。     

NaAlO_2-Al_2(SO_4)_3法制备拟薄水铝石成胶机理的研究

研究了拟薄水铝石和三水氧化铝的生成机理。考察了成胶pH、成胶温度对生成物类型的影响,在此基础上确定了NaAlO2溶液和Al2(SO4)3溶液成胶过程中完全中和时的临界体积比Ψ/Ψ0,在成胶过程中,当Ψ/Ψ0≤1时,NaAlO2溶液与Al2(SO4)3溶液发生中和反应生成拟薄水铝石和/或碱式硫酸铝;当Ψ/Ψ0>1时,过量的NaAlO2溶液发生自发水解反应,生成三水氧化铝。     

A Simon Effect With Stationary Moving Stimuli.

To clarify whether motion information per se has a separable influence on action control, the authors investigated whether irrelevant direction of motion of stimuli whose overall position was constant over time would affect manual left-right responses (i.e., reveal a motion-based Simon effect). In Experiments 1 and 2, significant Simon effects were obtained for sine-wave gratings moving in a stationary Gaussian window. In Experiment 3, a direction-based Simon effect with random-dot patterns was replicated, except that the perceived direction of motion was based on the displacement of single elements. Experiments 4 and 5 studied motion-based Simon effects to point-light figures that walked in place--displays requiring high-level analysis of global shape and local motion. Motion-based Simon effects occurred when the displays could be interpreted as an upright human walker, showing that a high-level representation of motion direction mediated the effects. Thus, the present study establishes links between high-level motion perception and action. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

双自由度后坐保险机构的计算机动态仿真

在Workin Model 3D软件上对引信的双自由度后坐保险机构进行了有关计算机仿真计算，并结合具体实例进行了优化设计。     

宝浪油田宝北区块套管失效机理研究

为了深化宝浪油田的套损机理研究．提出了套管损坏因素新的分类方法。根据该新分类法,研究了宝北区块的套损机理。研究结果揭示了套损井的分布区域在主力油藏区域和主力油层;在构造顶部区域和油层顶部层段;为边缘注水井;集中在强度较低,变形量较大的煤层段和泥岩层段;在储层强度较低的射孔段。这些规律可以用有限元分析和实验结果合理地解释。     

低渗透油田套管损坏机理分析及防治措施

在注水开发油田,油水井套管损坏是一种极为普遍的现象,但又各具特点.通过对鄯善油田套管损坏井的自身特点进行统计、归纳,深入分析低渗透砂岩油藏套管变形影响因素和作用机理,提出了套管损坏井的预防及相应治理措施.     

振动筛合金篦条磨损机理及抗磨损技术

分析了山西焦化股份有限公司振动筛合金篦条磨损情况，对合金篦条磨损机理进行了研究，提出控制磨蚀和提高材料耐磨洼的方法。     

Threshold‐Based Camera Motion Characterization of MPEG Video

We propose an efficient scheme for camera motion characterization in MPEG‐compressed video. The proposed scheme detects six types of basic camera motions through threshold‐based qualitative interpretation, in which fixed thresholds are applied to motion model parameters estimated from MPEG motion vectors (MVs). The efficiency and robustness of the scheme are validated by the experiment with real compressed video sequences.     

我国突发性水资源污染事故应急机制的若干问题评述

基于突发性水资源污染事故应急处理现状的分析,对目前我国突发性水资源污染事故防范和应急机制的建立进行探讨,指出当前工作中的三大缺陷,并有针对性地提出如何加快防范突发性水资源污染事故以及建立相关应急机制的进程的若干措施,包括突发污染事故的隐患调查、脆弱性评价、水质预报、动态监测以及应急组织机构等方面,以期能为我国减少突发性水资源污染事故及其损失提供一定的理论分析依据。