台湾海峡850hPa低空急流天气气候特征的初步分析

本文应用任意３ａ中８５０ｈＰａ上的风及５００ｈＰａ和地面气象资料，对台湾海峡地区出现低空急流的天气气候特征，形成急流的天气背景及其影响下的天气进行初步分析。结果表明，台湾海峡地区８５０ｈＰａ低空急流具有明显的季风特征和特定的地理影响。     

Educating Geographers with GIS Skills for the Real World: Some Feedback from Geography Graduates at Southwest Texas State University

Abstract

Results of a survey to find out whether the GIS program in the Department of Geography at Southwest Texas Stare University (SWT) has served its graduates well are presented. In recent years, a considerable amount of effort has been given to the development of strategies for expanding the existing horizon of GIS education, integrating existing programs, and improving the ways in which GIS education is delivered. This study takes a different approach and seeks to get input from geography graduates who have secured a job in the real world for improving a university GIS program. Based on 26 responses to the survey, employment categories of SWT geography graduates are examined first. Then, geography courses that are considered most helpful in career development by the survey participants are identified. Third, useful GIS courses and essential skills required by the marketplace in the real world as suggested by the survey participants are discussed. It is clear from the results of the survey that the geography program at SWT in general has served its graduates well. Results from the survey also clearly indicate that GIS skills are useful in the career development of most geography graduates, particularly for those who have a concentration area in either GIS/Cartography, Resource and Environmental Studies, or Urban and Regional Planning.     

东海陆架盆地重震联合解释推断研究

目前,我国海洋区域地质调查以重磁为主,辅以二维地震,用单一的物探方法难以探测海区沉积盆地中的各个密度界面,本文充分发挥地震、重力和磁力资料的特点,进行优势互补,利用重震联合界面反演技术,对东海陆架盆地的三个密度界面,上新统底界面、中新统底界面和沉积基底进行反演,利用反演结果对研究区的构造区划进行重新认识.东海陆架盆地西部凹陷基本缺失渐新统,海礁凸起南北两块的分界处东西方向的长度较短,钱塘凹陷向东北方向延伸较长,东部西湖凹陷地层发育齐全,新生代沉积厚度大,沉降幅度大,底界面在11794米左右.说明利用重震联合密度界面反演及解释是一项可行的技术.     

A shortest path algorithm with novel heuristics for dynamic transportation networks

Finding an optimal route in dynamic real‐time transportation networks is a critical problem for vehicle navigation. Existing approaches are either too complex or incapable of managing complex circumstances where both the location of a mobile object and traffic conditions change over time. In this paper, we propose an incremental search approach with novel heuristics based on a variation of the A* algorithm–Lifelong Planning A*. In addition, we suggest using an ellipse to prune the unnecessary nodes to be scanned in order to speed up the dynamic search process. The proposed algorithm determines the shortest‐cost path between a moving object and its destination by continually adapting to the dynamic traffic conditions, while making use of the previous search results. Experimental results evince that the proposed algorithm performs significantly better than the well‐known A* algorithm.     

Comparison and error analysis of remotely measured waveheight by high frequency ground wave radar

High frequency ground wave radar (HFGWR) has unique advantage in the survey of dynamical factors, such as sea surface current, sea wave, and sea surface wind in marine conditions in coastal sea area. Compared to marine satellite remote sensing, it involves lower cost, has higher measuring accuracy and spatial resolution and sampling frequency. High frequency ground wave radar is a new land based remote sensing instrument with superior vision and greater application potentials. This paper reviews the development history and application status of high frequency wave radar, introduces its remote-sensing principle and method to inverse offshore fluid, and wave and wind field. Based on the author's "863 Project", this paper recounts comparison and verification of radar remote-sensing value, the physical calibration of radar-measured data and methods to control the quality of radar-sensing data. The authors discuss the precision of radar-sensing data's inversing on offshore fluid field and application of the assimilated data on assimilation.     

The wavelet analysis of the period of solar activity

Using the wavelet technique, we analyzed the time series of solar radio fluxes at 2800 MHz as well as sunspot numbers and areas. The results are as follows: (1) These three data sets demonstrate that the most prominent period is 10.69 years and that all other periods are not obvious. (2) The wavelet power spectrum displays the changes of the power spectrum over the entire time-period range and shows the variations in the local power of a given period in a given time interval. Our analysis shows that periods shorter than one year are distinct only around solar activity maximum. (3) The time curves of the wavelet power at three periods (10.69 years, 5.11 years and 155.5 days) for the three times series are rather alike, with the same times of peaks and similar undulations. The shorter the period, the more frequent the fluctuations.     

CYF-0.2型油水分离器的台架试验

对CYF-0.2型油水分离器进行了台架试验,并对其分离效果的影响因素进行了分析。结果表明:该油水分离器的分离效果为10mg/L以下,满足国家规定的排放标准(15mg/L);水的流速、温度、压力以及水中污油的种类等是影响油水分离器分离效果的主要因素。     

一种柴油机热力循环火用平衡计算法

针对柴油机热力循环的特点,提出了一种柴油机火用平衡计算方法,该方法可以计算出工质与冷却介质之间由于温差传热而引起的火用损失。计算结果表明,减少排气损失和工质与冷却水的温差传热损失、改善燃料燃烧过程是提高内燃机可用能利用率的主要途径。     

The polypeptide in Chlamys farreri can protect human dermal fibroblasts from ultraviolet B damage

To investigate the effect of polypeptide fromChlamys farreri (PCF) on NHDFin vitro, we modeled oxidative damage on normal human dermal fibroblasts (NHDF) exposed to ultraviolet B (UVB). In this study, 3-[4,5-Dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) were tested to measure cell viability. Enzymes including superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), catalase (CAT) and xanthine oxidase (XOD) were determined biochemically. Total antioxidative capacity (T-AOC) and anti-superoxide anion capacity (A-SAC) were also determined. Ultrastructure of fibroblasts was observed under transmission electron microscope. The results showed that: UVB (1.176×10⁻⁴ J/cm²) suppressed the growth of fibroblasts and the introduction of PCF (0.25%–1%) before UVB reduced the suppression in a concentration-dependent manner. PCF could enhance the activities of SOD, GSH-PX and T-AOC as well as A-SAC. Also PCF could inhibit XOD activity, while it did not affect CAT activity. Ultrastructure of fibroblasts were damaged after UVB irradiation, concentration-dependent PCF reduced the destructive effect of UVB on cells. These results indicated that PCF can protect human dermal fibroblasts from being harmed by UVB irradiation via its antioxidant proerty. This work was supported by the National Natural Science Foundation of China (No. 39970638) and the Science and Technology Bureau of Qingdao (No. 2001-28-50).     

Derivation of the Spiral Motion of an Eruptive Prominence and Its Explanation

A 2D velocity field of the eruptive prominence (EP) of 1991 March 5 is obtained from its spectral data observed at the Yunnan Observatory and the velocity distributions along the entrance slit are derived for different observing frames. Under the assumption that matter in the EP undergoes axial, radial and possible rotational motions, we construct a theoretical velocity distribution of the EP along the entrance slit, to derive, by fitting, the angular velocity of rotation w and the other three parameters (axial velocityυ0, radial velocityυr and the angle between the EP plane and the line of sightφ). We found: an averaged angular velocityωof 3.0 f6 10-3 arc s-1 and the variation ofωwith the height above the solar limb. As the EP rises, the matter within it in fact moves along a spiral path around its axis. The spiral motion may be explained by the theory of plasma 'double pole diffusion' (DPD) caused by a sharp density gradient between the eruptive prominence and the surrounding corona. A theoretical angular velocityω' is estimated based on the DPD and basically coincides withωobtained from the optimal velocity fitting.