基于多光谱遥感影像分类的城镇用地变化研究

选择上海城镇化较典型的边缘区域之一嘉定区为研究对象,基于4时相的多光谱遥感影像研究了该区域城镇用地变化情况。采用一种改进的遗传算法优化BP神经网络的遥感影像分类方法,进行了较高精度的土地覆盖类型分类。在此基础上,提取出研究区域的城镇用地类型,然后利用不同年份的4幅城镇用地图像中像素值与叠加得到的1幅城镇用地变化图像中像素值之间的16种对应关系,按板块统计研究区域内任意2个年份间隔内城镇用地变化的数量,从而检测了该区域在研究时间段内的城镇用地变化情况。     

地理信息系统GIS支持下的城市地质环境评价

以 GIS为支撑工具 ,对城市地质环境空间数据库的建立方法、城市建设用地类型的初步划分及城市建设用地与地质环境的协调性评价模型作了分析 ,并选取典型实例进行剖析 ,结果表明 GIS是城市地质环境研究的有效工具。     

Limits in arson debris analysis by capillary column gas chromatography/mass spectrometry

Sample enrichment technology and instrumental sensitivity are no longer limiting factors in arson debris analysis. When pyrolyzed, petroleum based composite materials may produce artifacts. Urban air is another major source of interference since some of the components typically found in air, in particular alkylated aromatic hydrocarbons, are customarily used as indicators for the presence of gasoline. It is suggested to replace qualitative analysis with a quantitative approach, taking the sample matrix into consideration.     

ISO radiation sterilization standards

This presentation provides an overview of the current status of the ISO radiation sterilization standards. The ISO standards are voluntary standards which detail both the validation and routine control of the sterilization process. ISO 11137 was approved in 1994 and published in 1995. When reviewing the standard you will note that less than 20% of the standard is devoted to requirements and the remainder is guidance on how to comply with the requirements.

Future standards developments in radiation sterilization are being focused on providing additional guidance. The guidance that is currently provided in informative annexes of ISO 11137 includes: device/packaging materials, dose setting methods, and dosimeters and dose measurement, currently, there are four Technical Reports being developed to provide additional guidance:

1. 1. AAMI Draft TIR, “Radiation Sterilization Material Qualification”

2. 2. ISO TR 13409-1996, “Sterilization of health care products — Radiation sterilization — Substantiation of 25 kGy as a sterilization dose for small or infrequent production batches”

3. 3. ISO Draft TR, “Sterilization of health care products — Radiation sterilization Selection of a sterilization dose for a single production batch” li]4. ISO Draft TR, “Sterilization of health care products — Radiation sterilization-Product Families, Plans for Sampling and Frequency of Dose Audits.”

     

基于多特征融合的城市遥感图像自动解译方法

为更全面有效地解译城市遥感图像,提出了一种新的基于多特征融合的自动解译方法。该方法定义对象网络来表达图像结构并获取更为准确的处理单元。在此基础上,综合分析颜色、纹理、形状和位置等众多特征,通过自适应的概率学习训练最优分类器并标记目标类别。方法中还结合上下文信息进行空间平滑,大大消除了噪音、遮挡等影响,矢量标绘后得到最终解译结果。实验表明,该方法准确率高、鲁棒性好,适用于多种遥感图像城市场景的自动解译。     

基于应用型人才培养的实验课程体系改革

为适应应用型人才培养,针对本校化学实验课程实际,探讨化学实验课程设置、课程内容及课程实施的改革思路,设置基础实验、综合实验和专业实验,加强实验内容与实践的联系,坚持导师制与实验教学的结合。     

On-line liquid chromatography – gas chromatography for automated clean-up and analysis of polycyclic aromatic hydrocarbons

A fully automated system, comprising a liquid chromatograph (LC) coupled on-line to a gas chromatograph (GC) by means of a loop interface, has been constructed for clean-up and analysis of polycyclic aromatic hydrocarbons (PAH). An autosampler was utilized for sample injection into the LC. By the use of a back-flush technique in conjunction with an ordinary analytical aminopropylsilica column, PAH could be isolated by LC: a concurrent solvent evaporation injection technique was then used for on-line transfer of the PAH fraction to the GC, where the PAH analysis was completed. Compared with ordinary off-line LC clean-up followed by GC analysis, the sensitivity has been increased by a factor of 50–100, yielding a detection limit for individual PAH of a few nanograms per sample when using flame ionization detection. Further, irreproducible losses of low molecular weight PAH as a result of solvent evaporation steps in off-line clean-up procedures have been eliminated. Reproducibility of retention times and relative peak areas is high, facilitating automatic peak identification and calculation of concentrations, and the system can thus be used for automatic sample evaluation. The total time required for clean-up and analysis is only 1.5 hours, and the demand on personnel time for the analysis of PAH has been drastically reduced. The technique has been demonstrated with samples of urban air and of used automobile engine lubricating oil.     

The setting of profit targets for target oriented divisions

Setting profit targets and striving to achieve them is fundamental to business survival and success. However, there has been little research on modeling profit-target setting. In this paper, we study analytic target setting under a common business scenario where a firm is in control of multiple divisions. Both the firm and the divisions maximize the profit probability, i.e., the probability of achieving some given profit target. The firm sets a profit target for each division which then acts as a price-setting newsvendor. We first obtain the optimal order quantity, the optimal retail price, and the maximal profit probability of a single division given its assigned target. We then derive the firm’s profit probability and focus on two specific cases to gain more managerial insights. In the first case of fair target setting, we show that when each division’s demand distribution has an increasing failure rate, if a division has a relatively high (low) production cost, its assigned profit target decreases (increases) with regard to its price elasticity. In the second case, if the firm is in control of two identical divisions, each division’s optimal profit target is just half of the firm’s profit target when the price elasticity is two or more, regardless of production cost and demand distribution.     

上海城市和农村居民消费结构分析

根据上海城市和农村居民消费结构的统计数据,对居民的八项消费支出进行因子分析,从而比较分析上海城市和农村居民消费结构的状况及变化趋势,并对上海城乡居民的消费差异做出评价。