Chemical attraction of the eastern yellowjacket,Vespula maculifrons (Hymenoptera: Vespidae)

Summary Workers and queens of the eastern yellowjacket,Vespula maculifrons, are attracted to the artificial long-range attractant pheromone of the predaceous pentatomid,Podisus maculiventris. A 11 mixture of linalool or -terpineol and (E)-2-hexenal is as attractive toV. maculifrons workers as the pheromone.We thank A.S. Menke of the Systematic Entomology Laboratory, USDA, for identifying the yellowjackets. Mention of a company name does not imply endorsement by the US Department of Agriculture.     

凹坑板式空气预热器的传热特性及多目标优化

以全焊接型凹坑板式空气预热器为对象,基于最优设计试验方案,运用Workbench Fluent软件数值模拟凹坑板片特征结构参数对传热流阻性能的影响。基于参数敏感度分析,得到单因素作用下对传热流阻性能的影响程度为凹坑的纵向间距>长轴>横向间距>深度。基于响应曲面法分析,得到多因素协同作用时,凹坑之间的结构参数横纵距对性能影响比凹坑自身的结构参数深径比大。基于遗传算法以摩擦因子f最小、努塞尔数Nu与综合换热因子J_F最大为优化目标,得到给定范围内的3组较优结构组合。     

IRS辅助的MISO-SWIPT安全速率最大化算法

为增强系统的稳定性,基于智能反射面（intelligent reflection surface,IRS）辅助安全通信,为用户采用功率分配架构的无线携能传输（simultaneous wireless information and power transfer,SWIPT）技术以提高用户安全速率并降低用户的能量消耗,建立了系统安全速率最大化的目标函数模型;考虑IRS相移约束、基站最大发射功率、功率分配比率约束和用户最低能量采集约束,提出了一种基于交替优化的安全速率最大化算法。利用连续凸近似算法,将目标函数转化为凸的形式;采用交替优化,对耦合变量进行解耦处理;提出一种波束赋形算法以实现安全速率最大化。仿真表明,提出的算法能够有效提升IRS辅助的SWIPT系统的安全速率,至少比其他算法提高了2.63bps/Hz。     

上海市集成电路及机电一体化产品的比较优势研究

本文用一种“节汇成本比较”的方法,对上海市集成电路及机电一体化产品的比较优势进行调查研究,提出了上海市在这两个产品领域发展重点的建议。     

以XPS研究谢一矿矸石粉表面与非离子表面活性剂间的相互作用

本文用XPS分析比较了非离子型表面活性剂司班—80和吐温—85对谢一矿矸石粉的表面改性处理效果,发现在所讨论的情况下,表现处理过程主要是一个物理过程.然而,在矸石粉的Ca与处理剂分子中的O之间,存在着较明显的化学作用.     

Sea water intrusion and salt water intrusion in the coastal area of Laizhou Bay

The characteristics, pattern, hydrodynamic and hydrochemical features, and the movement pattern of the salt waterfresh water interface of the sea water intrusion and the salt water intrusion, which occur in the coastal area of Laizhou Bay in Shandong Province, are analysed. The characteristics of the two kinds of intrusion are compared as well. A three-dimensional sea water intrusion model to describe the sea water intrusion with a transitional zone 1.5–6.0 km wide in the phreatic aquifer and a solute transport model describing the behavior of cations exchange in the process of sea water intrusion are established.     

阳离子交换树脂催化合成1—萘乙酸甲酯的研究

本文研究了用强酸性阳离子交换树脂作催化剂,１—萘乙酸和甲醇直接酯化合成１—萘乙酸甲酯的反应。考察了催化剂用量,反应物料配比,反应时间等因素对产率的影响,通过正交实验,找到了较佳反应条件：当催化剂用量为反应液的３％,醇酸摩尔比为２０～３０,在回流温度下反应４小时,酯的收率＞９２％,纯度＞９９％。该法工艺简单,操作方便,无三废污染,适合工业化生产。     

静电像管均方根半径的计算及像质评价

探讨在电子光学成像系统中像评定的一种途径。方法,从静电这像差均方根理论出发,追迹计算大量空间轨迹的落点及系统均根半径,并由此衍算成弦财制传递函数。     

谐振腔镜对高斯光束远场发散角的影响

利用变换矩阵和ＡＢＣＤ定律讨论了激光谐振空对高我束的变换,推导出高斯光束参数通过光腔输出镜的变换公式。并对热透镜腔,光束远场发散角等问题进行了讨论。     

The v-v energy transfer of highly vibrationally excited states (I)

The relaxation of the highly vibrationally excited CO (v = 1–8) by CO₂ is studied by timeresolved Fourier transform infrared emission spectroscopy (TR FTIR). 193 nm laser photolysis of the mixture of CHBr₃ with O₂ generates the highly vibrationally excited CO(v) molecules. TR FTIR records the intense infrared emission of CO(v→v-1). The vibrational populations of each level of CO(v) have been determined by the method of spectral simulation. Based on the evolution of the time resolved populations and the differential method, 8 energy transfer rate constants of CO(v = 1–8) to CO₂ molecules areobtained: (5.7±0.1), (5.9±0.1), (5.2±0.2), (3.4±0.2), (2.4±0.3), (2.2±0.4), (2.0±0.4) and (1.8±0.6) (10¹⁴ cm³ · molecule⁻¹ · s⁻¹), respectively. A two-channel energy transfer model can explain the feature of the quenching of CO(v) by CO². For the lower vibrational states of CO, the vibrational energy transfers preferentially to the u³ mode of CO² For the higher levels, the major quenching channel changes to the vibrational energy exchange between CO(v→v-1) and the u¹ mode of CO².