城市径流总量控制指标分解及实现路径探索与实践

针对海绵城市径流总量控制目标,提出一种在城市规划体系中控制性详细规划和修建性详细规划阶段分解落实年径流总量控制率的方法。在控制性详细规划阶段分解径流总量控制指标时,分步骤先后确定各项低影响开发措施的面积率和下沉深度;在修建性详细规划阶段,配合径流总量控制指标分解结果,给出适宜的各项低影响开发措施的技术实施导则,以保证各单项指标的正确实施,并以某项目为例介绍了技术实施导则的构建方法。     

Air sampling of volatile sex pheromone components in a closed jar

A cotton wool plug, used as the source for pheromone release, was placed in closed 1-quart Mason jars, either at the mouth or at the rear of the jar. Air sampling of the two components of the sex pheromone (total 2.2 mg at the source) of the almond moth (Ephestia cautella) female showed that the saturation period near the source in still air was 20–22 hr and that far from the source was 40–50 hr, reaching a level of less than 1 ng/ml air. The ratio between the components (Z,E)-9,12-tetradecadienyl acetate, designated D, and (Z)-9-tetradecenyl acetate designated M, in the air was close to the original ratio for both sampling sites, albeit somewhat richer in the more volatile (Z)-9-tetradecenyl acetate (source 77.023.0 DM, air 73.0– 74.327.0–25.7; source 80.119.9, air 77.622.4; source 25.174.9, air 23.976. 1 DM). The total amount of pheromone per milliliter of air was two to three times larger near the source than far from it at the early stages of the evaporation and saturation process. When the amount of pheromone applied to the source was tripled (7 mg), the amount far from the source was almost tripled, or the saturation time was cut by factor of two to three.     

有限体积法求解立体角离散误差

为解决采用有限体积法求解辐射传输方程时引起离散误差的问题,从有限体积法立体角内热流密度的求解过程出发,运用泰勒级数推导了近似误差的表达式,并分析影响离散误差的各种因素,包括离散射线数,辐射强度分布,假散射及网格比.根据分析结果,采用辐射强度的连续分布模型,模拟了各种因素对误差的影响.结果表明,辐射强度的分布函数对于有限体积法的离散误差有一定程度影响.当增加网格数及减小网格尺寸比时,可以有效地减小离散误差.假散射与离散误差间呈较强的非线性耦合关系.     

Progress and recent trend in MILD combustion

Moderate or intense low oxygen dilution(MILD)combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs.However,due to the lack of the fundamental knowledge on this combustion,there is a misconception that MILD combustion should be established by high preheating of the air,which has limited its application.Our research and development on this combustion has been performed for several years. We have found that the requ...     

基于有限体积法的G4-73型离心风机三维流场数值模拟

基于有限体积法,利用Fluent软件对G4-73型离心风机内部流场进行了全三维数值模拟。结果表明:蜗壳内的低能流体区沿轴向朝流动方向推进;叶轮内的静压和动压在叶片吸力面靠近叶轮进口处最低,叶轮流道中动压等值线呈"凸"型分布,在叶片压力面靠近叶轮出口处静压和动压达到最大值,且叶轮出口相对总压损失集中在吸力面和前盘侧。     

超视距空战飞行轨迹建模及仿真

超视距多目标攻击逻辑决策和空战态势评估是超视距空战研究的主要方面,但对空战战术影响较大的战机飞行轨迹和飞行参数的研究较少.通过对超视距空战和视距内空战的比较,分析了超视距空战的空战过程.根据超视距空战迎头攻击战术的特点,建立了相应飞行轨迹的数学模型,并求解了载机速度、载机发射导弹速度、转弯速度、载机转弯半径、目标机速度、载机飞行时间、转弯时间和导弹飞行时间之间的关系.通过仿真分析了飞行参数对飞行轨迹的影响,并根据载机性能约束条件,求解了飞行参数的最优解.仿真结果表明,飞行轨迹模型和最优飞行参数设计的合理性和可信性,可为超视距空战战术、战法决策等作战应用提供重要参考.     

基于物理的波浪实时模拟方法

为解决广域范围内波浪状态的实时计算和可视化问题,结合无粘滞流体力学的物理模型,提出了一种以三角形为控制单元的有限体积简化算法。该算法的优点在于：以不规则边界区域的非规则三角网格为基础,通过简化通量向量分裂方法获得三角形控制单元的边界数值通量,能快速逼近二维浅水方程的解进而模拟非规则边界浅水的实时流动。实验结果显示,所提方法能在符合现实世界物理规律的前提下较好地实现大规模波浪的实时可视化模拟。     

乳胶涂料中填料粒径测定与分散剂的选择

介绍了重力沉降法和容量沉降法两种测定乳胶涂料中填料粒径的方法。通过比较粉体粒径结果显示：沉降法比激光法更形象直观，更能代表体系粒径真实情况。以滑石粉、重钙、轻钙粉体为基准，采用不同用量、不同类型的分散剂的容量沉降法进行比较得出：用容量沉降法能定量地对分散剂性能做出评价。     

500kV断路器因空气压力低告警导致断路器控制保护回路断线分析

针对天生桥换流站500kV三菱断路器因空气压力低告警导致断路器控制保护回路断线这一情况,根据工作站中出现的信号,结合断路器的控制、保护二次回路,对信号及其出现的缘由进行分析,评估断路器控制保护回路断线时,可能出现的安全生产风险,发现目前存在的问题,并对这些问题提出解决方案。     

调节阀“三断”保位方案在焦化厂的应用

根据厂区所使用的调节阀自身具备的功能以及生产工艺需求,选择合适的（三断）保位方案,分析了所选择方案的工作原理及优、缺点及适用条件.