一种CMOS混合电源供给管理方案

针对目前便携式设备对多电源供电的要求提出了一种CMOS工艺下的片内电源管理方案。该方案可实现3种输入电源即：交流适配器(AC)、USB电源、以及电池电源之间的选择，并设置供电电源优选顺序为：交流电源、USB、电池。另外本文设计了相应的欠压保护电路，使得该电源管理方案更加完整。     

Optimal common-mode Voltage reduction PWM technique for inverter control with consideration of the dead-time effects-part I: basic development

The objective of this paper is to investigate the optimal common-mode voltage reduction pulsewidth modulation (PWM) technique when dead-time effect is taken into account. The effect of dead time on common-mode voltage for inverter control and the associated solution are discussed. Based upon these results, an optimal common-mode voltage reduction PWM technique, which requires no extra voltage/current sensors and compensation mechanism while not being affected by the dead time, is recommended. The common-mode voltage can be reduced to one-third for the inverter with diode front end, which is widely used in industry. Intensive measured results are presented to fully support the claims.     

用科学发展观推进水利“十个转变”

树立和落实科学发展观，除不断深化对科学发展观的科学性、必然性和战略性、指导性的认识，不断增强坚持和落实科学发展观的自觉性和坚定性外，更重要的是要将科学发展观付诸实践，见诸行动，贯穿到促进经济社会发展和推动改革开放的各项工作中去，在实践中将科学发展观转化为强大的物质力量。水利行业贯彻和落实科学发展观，关键在于认清形势，立足实际，把握重点，明确方向，在扎实推进“十个转变”上下功夫。     

小型电力供应商的竞标策略研究

对一类其竞标策略对电力市场实时价格的影响可以忽略不计的小型电力供应商（pricetaker）,就如何选择竞标策略的问题进行了研究。在3个相关定理的基础上,利用蒙特卡罗方法对由Scenario方法和经济调度方法分别给出的竞标策略进行评估,并由此给出一种竞标策略选择的系统方法。该方法不仅可以解决小型电力供应商的竞标策略选择,也可用于一般电力供应商的竞标策略选择。     

On the determination of optimal transition profile of a stepped bar in tension or in torsion by BEM

The objective is to have uniformly distributed tangential stresses on the transition profile of a stepped bar subjected to tensile and torsional loading using an axisymmetric boundary element formulation. The transition curve is represented by the Langragian interpolation polynomial with progressive degrees to avoid shape distortion during the optimization procedure. The calculated result is compared with that obtained by fluid dynamics given in the literature. It is seen that the transition curve obtained in this paper is reasonable.     

Characterization of PAHs in the atmosphere of carbon black manufacturing workplaces

The objective of this study was set out to characterize the polycyclic aromatic hydrocarbon (PAH) content in the atmosphere of an oil furnace carbon black manufacturing plant located in southern Taiwan. A standard semi-volatile sampling train, the PS-1 sampler, was used to collect samples from eight areas, including the feedstock oil unloading, furnace, filtering/micro-pulverization, pelletizing, packaging, office/outside, office/inside, and boundary area, respectively. For each area, side-by-side static samples were collected simultaneously and a total of 16 samples were obtained. For each collected sample, the adsorbent-retained PAH content and the filter-retained PAH content were used directly to determine the concentrations of gaseous-phase PAHs and particle-bound PAHs, respectively. The gas chromatograph/mass spectrometer (GC/MS) technique was used for PAH analyses, and a total of 21 PAH species were determined. Results show the gaseous-phase PAHs accounted for only 69.2% of the total PAH content for samples collected from the packaging area, which was significantly lower than those samples collected from the rest of seven areas (ranging from 96.3 to 99.7%). The result is not so surprising since the packaging area had the highest dust concentration due to the releasing of carbon black dusts during the packaging process. In this study, we further examine the contribution of gaseous-phase PAHs to the total benzo[a]pyrene equivalent (BaP(eq)) content from the health-risk assessment view of point. It can be found the contribution of gaseous-phase PAHs to the total BaP(eq) content (63.1%) was quite comparable to the corresponding contribution to the total PAH content for samples collected from the packaging area. However, a different trend can be found for samples collected from the other seven areas, where the contributions of gaseous-phase PAHs to the total BaP(eq) content (ranging from 67.7 to 93.4%) were lower than the corresponding contributions to the total PAH content. The above results can be explained by PAH homologues that contained in both gaseous-phase and particle-bound PAHs. It was found the gaseous-phase PAHs contained higher fractions of less carcinogenic low molecular weight PAH homologues, whereas particle-bound PAHs contained higher fractions of more carcinogenic high molecular weight PAH homologues. Considering the contributions of gaseous-phase PAHs to both total PAH content and total BaP(eq) content were well above 50% for the eight studied areas, it is concluded that both particle-bound and gaseous-phase PAHs should be included for assessing the exposures of carbon black workers.     

Estimating long-term time-resolved indoor PM2.5 of outdoor and indoor origin using easily obtainable inputs

To evaluate the separate impacts on human health and establish effective control strategies, it is crucial to estimate the contribution of outdoor infiltration and indoor emission to indoor PM_2.5 in buildings. This study used an algorithm to automatically estimate the long-term time-resolved indoor PM_2.5 of outdoor and indoor origin in real apartments with natural ventilation. The inputs for the algorithm were only the time-resolved indoor/outdoor PM_2.5 concentrations and occupants’ window actions, which were easily obtained from the low-cost sensors. This study first applied the algorithm in an apartment in Tianjin, China. The indoor/outdoor contribution to the gross indoor exposure and time-resolved infiltration factor were automatically estimated using the algorithm. The influence of outdoor PM_2.5 data source and algorithm parameters on the estimated results was analyzed. The algorithm was then applied in four other apartments located in Chongqing, Shenyang, Xi'an, and Urumqi to further demonstrate its feasibility. The results provided indirect evidence, such as the plausible explanations for seasonal and spatial variation, to partially support the success of the algorithm used in real apartments. Through the analysis, this study also identified several further development directions to facilitate the practical applications of the algorithm, such as robust long-term outdoor PM_2.5 monitoring using low-cost light-scattering sensors.     

基于无人机的倾斜摄影平台开发

利用无人机采集倾斜摄影数据,改变了传统的测绘作业方式,大幅度提升了作业效率。基于开发出适合小型无人机专用的倾斜摄影平台的目的,利用多台小型相机,通过对摄影平台结构、相机拍照控制、相机数据传输等多个关键技术的研究,开发出了一种轻量级的五拼相机,极大地拓展了倾斜摄影数据采集的手段,提高了数据采集的效率。     

对房屋成新度确定方法的探讨

对房屋质量等级的判定建立了模糊数学综合评判模型，提出了对旧房价格评估的成新度计算方法。