Pinger监视系统在海洋有缆取样作业中的应用

为了提高海洋有缆取样的作业效率,在海洋勘探中采用Pinger监视系统,其包括水下发声器Pinger及水上监控设备Deso25测深仪。文章首先介绍了Deso25测深仪的系统构成及其应用范围,然后探讨了Pinger的工作原理及Deso25的Pinger模式的工作方法,通过测深仪的观测和记录结果监控勘探设备的到底情况,增强了取样设备的安全性,并提高作业的成功率。     

大阻力液压支架柱窝结构设计与分析

对ZF21000/25/45D大阻力支架柱窝结构进行专业性设计,并根据Hertz接触模型算出载荷接触半径与分布规律,最后利用ANSYS进行静力学仿真,验证其结构设计的合理性。     

虫螨克防治梨木虱,苹果黄蚜,山楂叶螨的效果

２５％虫螨克乳油是一种广谱性杀虫杀螨剂，具有触杀和胃毒作用，且有一定的杀卵活性。经１９９３￣１９９４年试验证明，虫螨克对梨木虱防效显著，能有效地控制苹果黄蚜和山楂叶螨等虫螨的为害。     

MEASUREMENT OF VOC EMISSIONS FROM PONDEROSA PINE LUMBER USING COMMERCIAL AND LABORATORY KILNS

The 1990 U.S. Clean Air Act has increased the need to know what is emitted from dryers, but measuring emissions on a commercial scale is difficult and expensive. A laboratory method would allow closer control over the process and allow process variables to be studied with reduced variability and at a lower cost. In this research project, the total hydrocarbon emissions from a commercial lumber dry kiln are compared with those from a laboratory lumber dry kiln. The results showed that when the same drying schedules were used to dry matched charges of ponderosa pine lumber (2-inch nominal thickness by random width), the commercial kiln emitted an average of 2.21 g of hydrocarbon (reported as carbon) per kilogram of oven-dried wood (kg_ODwood), while the laboratory kiln averaged 1.49 g/kg_ODwood. The spectra of monoterpenes emitted from each dryer were similar. These results indicate that emissions measured in this laboratory kiln can be used to represent those from commercial-scale lumber dry kilns if an appropriate scale-up factor is used.     

Robust estimators under semi‐parametric partly linear autoregression: Asymptotic behaviour and bandwidth selection

Abstract. In this article, under a semi‐parametric partly linear autoregression model, a family of robust estimators for the autoregression parameter and the autoregression function is studied. The proposed estimators are based on a three‐step procedure, in which robust regression estimators and robust smoothing techniques are combined. Asymptotic results on the autoregression estimators are derived. Besides combining robust procedures with M‐smoothers, predicted values for the series and detection residuals, which allow to detect anomalous data, are introduced. Robust cross‐validation methods to select the smoothing parameter are presented as an alternative to the classical ones, which are sensitive to outlying observations. A Monte Carlo study is conducted to compare the performance of the proposed criteria. Finally, the asymptotic distribution of the autoregression parameter estimator is stated uniformly over the smoothing parameter.     

钻井双壁钻具研制与应用

为解决在充气钻井液欠平衡压力钻井时，使用常规井下动力钻具和随钻测量仪器进行井眼轨迹控制中遇到的技术难题，研制了双壁钻具。详细介绍了合理解决双壁钻具高压钻井液流道直径、气道直径和钻具强度等问题的方法，根据具体情况制定了特定的扣型，确定了双壁钻具的具体参数。现场试验表明，使用充气钻井液进行欠平衡钻井时，应用双壁钻具可使井下动力钻具和随钻仪器的性能不受影响，能进行正常的井眼轨迹控制。     

反胶束法原位合成P25-MPTMS-CdS及光化学性能研究

本文将反胶束法制备的CdS晶体键合在经γ 巯丙基三甲氧基硅(MPTMS)修饰的P25粒子的表面.产物P25 MPTMS CdS复合粒子的紫外 可见吸收和粒子形貌分别用漫反射光谱仪和透射电镜进行了表征.同时也进行了光催化降解甲基橙溶液的实验,发现P25 MPTMS CdS在紫外和可见光下区域都具备较高的光催化活性.经过18h的可见光照后(λ>400nm),紫外 可见光谱表明,P25 MPTMS CdS粒子具备较好的光稳定性.     

Bounds for theN lowest eigenvalues of fourth-order boundary value problems

We describe a method for the calculation of theN lowest eigenvalues of fourth-order problems inH ₀ ² (Ω). In order to obtain small error bounds, we compute the defects inH ⁻²(Ω) and, to obtain a bound for the rest of the spectrum, we use a boundary homotopy method. As an example, we compute strict error bounds (using interval arithmetic to control rounding errors) for the 100 lowest eigenvalues of the clamped plate problem in the unit square. Applying symmetry properties, we prove the existence of double eigenvalues.     

基于TMS320C25音频处理系统的C语言编程

这篇文章着重讨论了Ｃ语言程序在以ＴＭＳ３２０Ｃ２５为基础的处理系统中的开发和应用。详细介绍了从Ｃ源程序到适用于Ｃ２５格式的程序的开发过程，同时讨论了在开发过程中可能遇到的问题及其解决办法。同时，文章对两种编程语言在ＴＭＳ３２０Ｃ２５系统中的应用前景作了简单的比较和预测。     

Gescho?fl?che; subjektiv-?ffentliche Nachbarrechte

Nachbarn kommt auf die Einhaltung der maximal zul?ssigen Gescho?fl?chenzahl kein subjektiv-?ffentliches Recht zu, wenn sie bereits ein subjektiv-?ffentliches Recht auf Einhaltung von Abstandsvorschriften und Geb?udeh?hen geltend machen k?nnen.