Study of specific absorption rate (SAR) induced in two child head models and in adult heads using mobile phones

This paper gives a first comparison of specific absorption rate (SAR) induced in a child-sized (CS) head and an adult head using a dual-band mobile phone. In the second study, the visible human head is considered and comparison of SAR induced in a CS or child-like (CL) head and an adult head using a dual-band mobile phone is given. All the peaks of average SAR over a mass of 10 and 1 g in the head and the power budget are determined in the two comparisons using the finite-difference time-domain method. The differences between the results for adult and CS or CL heads are given at 900 and 1800 MHz. No important differences are noted for the peak SAR averaged over 10 g (SAR10 g), between the two adult head models, as well as between the two child head models. The peak SAR10 g in the brain of the CS or CL head is slightly more significant than that for the adult one.     

2/spl times/4 optical add-drop module with no difference in propagation length

We developed a micromachined X-type 2/spl times/4 optical add-drop module (OADM) featuring no difference in propagation length. Four pairs of lensed fibers are aligned in "X" position, and four micromirrors are located between the pairs of optical fibers. The OADM was fabricated utilizing a silicon-on-insulator process. Electrostatic comb actuators can be driven up to 90 /spl mu/m to change the light path within 1 ms. The insertion loss and the on-off ratio were less than 3 and 70 dB, respectively. The loss uniformity in every channel was 1.5 dB.     

Total and Fractional Performance of Granular Dust Traps in Refractory Production

Methods are proposed for designing interpolation models for the preliminary determination and subsequent forecasting of general and fractional breakthrough coefficients for dust used with granular filters, as employed in energy-saving and high-performance dust trapping from technological gases and ventilation discharges in refractory production. The models are supplied with nomograms, which makes them widely suitable for experts working in environmental protection at refractory-producing organizations. The main factors are identified that influence the performance. The results are of interest to experts in related areas of industry such as building materials and engineering ceramics and so on. Translated from Novye Ogneupory, No. 4, pp. 64–67, April, 2008.     

通信局房供电系统的谐波治理

本文在理论分析谐波产生及危害的基础上,针对某一通信局房,确定最终谐波治理方案并取得较好的治理效果,供同行在设计时参考。     

An investigation into physicochemical characteristics of ash produced from combustion of oil palm biomass wastein a boiler

Ash derived from combustion of Malaysian oil palm biomass (empty fruit bunches consisting of fibers) was physically and chemically characterized in order to provide a comprehensive understanding of its specific properties in terms of toxicity, compositions and reusability. Principal analyses conducted include particle size distribution, scanning electron microscopy, elemental dispersive X-ray, elemental analysis, toxicity characteristic leaching procedure (TCLP) as well as thermogravimetric, X-ray diffractometry and Fourier-transform infrared analyses. TCLP result indicated that the oil palm ash (OPA) should not be classified as toxic wastes in terms of heavy metal leachability since leachable copper, cadmium, lead and nickel concentrations were detected below the stipulated leachability limits. It was determined that the OPA contained high amount of potassium as well as presence of silica which implied its suitability to be reused as crude fertilizer or cement replacement material.     

松辽盆地南部岩性圈闭识别技术及效果

寻找隐蔽油气藏一直是油气勘探中的难题,我国东部吉林油田的中浅层已进入高成熟勘探阶段,油气勘探已由早期的构造圈闭勘探转变为现今的以隐蔽圈闭勘探为主的阶段。本文针对松辽盆地南部的西部前缘带三维连片工区及伊通地堑岔路河断陷,综合应用构造精细解释、声波曲线重构波阻抗反演、层序地层学、地震相及沉积(微)相分析、模型正演、地震属性分析、频谱分解及三维可视化等技术手段,所提供的多口探井获得工业油气流或有良好的油气显示,取得了较好的解释效果。     

控制性水库建设模式研究

水库梯级（尤其是控制性水库梯级）的建设在西南水电开发中具有举足轻重的地位。但控制性水库梯级一般位于河流上游，为获得需要的调节库容，要求有较高的坝，从而增加筑坝的难度，水库淹没较大，相应的投资亦较大，故经济性相对于其它类型的电站较差。为促进控制性水库梯级的建设，有必要对控制性水库的建设模式进行研究，寻求其可能的投资分摊方式。本文在合理核算上游控制性水库梯级对其下游梯级受益电站补偿调节效益的基础上，对上游控制性水库梯级建设模式进行了研究，提出了控制性水库梯级几种可能的建设投资分摊模式。     

Cooperative cache-based data access in ad hoc networks

Cooperative caching, in which multiple nodes share and coordinate cached data, is widely used to improve Web performance in wired networks. However, resource constraints and node mobility have limited the application of these techniques in ad hoc networks. We propose caching techniques that use the underlying routing protocols to overcome these constraints and further improve performance.