高黏度牛顿流体中砂粒运动实验研究

为了解决疏松砂岩稠油油藏开采过程中的砂粒运移问题,基于固液两相流理论及实验流体力学理论,利用研制的高黏度流体颗粒自由沉降实验装置,分别开展了高黏度牛顿流体中球形颗粒的自由沉降实验、砂粒的自由沉降实验和不同含砂体积分数下混合黏度变化规律实验,根据实验结果,建立了不同粒径范围的阻力系数模型以及混合黏度模型。研究表明,高黏油混合黏度存在相应的临界值,在实验条件下,含砂体积分数为0.1%时,混合黏度达到最低,不利于携砂。结合上述模型和实验结果,建立了高黏度牛顿流体中的砂粒运动模型,揭示了高黏介质中颗粒的特定运移规律,为今后稠油携砂流动规律理论研究奠定了基础。      

仪器安装板振动环境虚拟试验和验证技术研究

基于商用有限元软件MSC.Patran和Nastran,研究了导弹仪器安装板结构的振动环境预示技术。建立了仪器安装板的三维实体模型,单机仪器使用质点模拟,并通过MPC法与安装板连接;设置了多种阻尼特性,通过模态叠加法预示了该仪器安装板在振动条件下的结构动力学环境,通过振动试验验证了预示结果。研究发现,使用大阻尼能较好地预示该仪器安装板结构的动力学环境。     

PCS7自动控制系统在气烧窑上的应用

对柳钢气烧窑工艺流程及PCS7自控系统的设计特点及其在该项目上的应用做简要介绍。     

蔗糖发酵过程中无机磷含量的变化研究

无机磷与钼酸能形成磷钼酸络合物,该络合物能被还原剂α-1,2,4-氨基萘酚磺酸钠还原成钼蓝,用分光光度计确定蔗糖发酵前后无机磷的含量,观察发酵过程中无机磷的消耗。发现高浓度的磷酸盐会对微生物合成具有抑制和阻遏作用,无机磷含量的减少使葡萄糖磷酸化减慢,进而也影响糖酵解速度。研究表明在pH为6、温度为37℃、无机磷浓度为5g/L左右,发酵最佳。     

新钢10~#高炉优化高炉操作的生产实践

为稳定炉况,改善高炉操作指标,新钢10~#高炉进行了优化操作实践,取得了较好的效果。     

水热法制备粉煤灰钙基脱硫剂

文章研究了利用粉煤灰和Ca(OH)2为原料水热反应制备钙基脱硫剂。影响钙基脱硫剂钙剂利用率最主要的因素是水浴温度(TH),它的最佳值是90℃;温度上下浮动5℃,利用率将降低20%。其次还有水浴温度、粉煤灰与Ca(OH)2质量比(FC)、水固比(LS),这些因素的波动对利用率的影响相对较小。水浴时间(tH)达到8 h以上,FC在5～10的范围内变化,LS在8～18的范围内变化均能制备具有较高利用率的钙基脱硫剂。     

微风细雨:都江堰虹口香溪堂设计随笔

<正>都江堰虹口距成都市约80km,因避暑及漂流而成为成都的旅游胜地,生态旅游中心选址于虹口风景区深溪沟。项目分两期,一期为深溪沟接待点,由香溪行馆(别墅区)和香溪堂(服务配套建筑,190m~2)组成,二期为虹口旅游服务中心及酒店。香溪堂作为接待、休闲之用,规模很小,功能简单,但业主极为重视,把它作为二期启动前的形象展示,希望设计理念先进,独具个性。业主于2007年10月正式委托我们设计一期工程,原计划2008年6月动工。5月12日突如其来的汶川大地     

Improved ant colony optimization algorithms for determining project critical paths

In project management, a project can be represented as a network in two ways; namely, activity-on-arc (AoA) and activity-on-node (AoN). Two recent papers have shown that ant colony optimization (ACO) could find critical path(s) in projects represented as AoA networks. This paper points out that the number and placement of logical dummy activities associated with AoA-based networks can pose serious problems. To get around the problems, an ACO technique based on AoN networks is then proposed. For comparison, the two existing AoA-based ACO algorithms were reproduced and modified into AoN-based algorithms. Moreover, the proposed ACO algorithm was applied to AoA networks as well. All six algorithms were tested with several benchmark problems. The test results strongly indicate that AoN-based ACO algorithms are more effective and efficient in finding critical paths than AoA-based algorithms.     

Flexible and Highly Sensitive Strain Sensors Fabricated by Pencil Drawn for Wearable Monitor

Functional electrical devices have promising potentials in structural health monitoring system, human‐friendly wearable interactive system, smart robotics, and even future multifunctional intelligent room. Here, a low‐cost fabrication strategy to efficiently construct highly sensitive graphite‐based strain sensors by pencil‐trace drawn on flexible printing papers is reported. The strain sensors can be operated at only two batteries voltage of 3 V, and can be applied to variously monitoring microstructural changes and human motions with fast response/relaxation times of 110 ms, a high gauge factor (GF) of 536.6, and high stability >10 000 bending–unbending cycles. Through investigation of service behaviors of the sensors, it is found that the microcracks occur on the surface of the pencil‐trace and have a major influence on the functions of the strain sensors. These performances of the strain sensor attain and even surpass the properties of recent strain sensing devices with subtle design of materials and device architectures. The pen‐on‐paper (PoP) approach may further develop portable, environmentally friendly, and economical lab‐on‐paper applications and offer a valuable method to fabricate other multifunctional devices.     

相控阵机载雷达杂波抑制的时—空二维自适应滤波

本文提出了一种机载预警侧面相控阵雷达抑制地杂波的时-空二维自适应方法,该方法先对各列子阵的数据作多通道的多卜勒滤波,然后分别对相同多卜勒滤波器输出的数据作Capon自适应处理。理论分析和计算机模拟结果表明,本文方法的杂波抑制性能在天线阵元存在一定的随机幅度和相位误差情况下损失不大,对阵元失效也不敏感。