客运专线部分轮轨技术参数的分析

从车轮内侧距、最小轮缘厚、车轮踏面外形、轨底坡4个轮轨系统技术参数入手对我国客运专线相关轮轨技术参数进行浅析,提出建议。     

Trading strategies in the market for tankers

This paper introduces a new approach in timing the sale and purchase of ships in the tanker market and examines the performance of this trading strategy over the period January 1976 to September 2004. Based on the long-run cointegration relationship between earnings and price, we establish a trading model which can be used as an indicator of investment or divestment timing decisions. We also perform statistical tests using the bootstrap approach in order to discount the possibility of data snooping biases and test the robustness of our trading models. Our results indicate that trading strategies based on earning-price ratios significantly out-perform buy and hold strategies in the tanker market.     

Waterway traffic analysis of the Chicago River and lock

The vessel-carrying capacity of the Chicago River, Illinois, is restricted by a lock. separating the river from Lake Michigan. Currently, vessels passing through the lock experience long delays during summer months. An investigation and analysis of this system determined that although the system is now generally operating below capacity, the peak periods during summer weekends do approach capacity, and the situation is likely to deteriorate in the future. In addition, the river and lock have safety and traffic conflict problems that need attention. Recommendations to mitigate these problems are described.     

DIG－DNA探针检测宫颈癌组织中人乳头瘤病毒6、11、16、18型DNA

用地高辛配基（Ｄｉｇｏｘｉｎｇｅｎｉｎ）分别标记，制备ＨＰＶ－６、ＨＰＶ－１１、ＨＰＶ－１６及ＨＰＶ－１８的ＤＮＡ探针，应用核酸杂交技术，对３７例宫颈癌活检组织ＤＮＡ作了检测，各型ＨＰＶＤＮＡ的检出率为：ＨＰＶ－６０％（０／３７）、ＨＰＶ－１１２．７（１／３７）、ＨＰＶ－１６６７．５％（２５／３７）、ＨＰＶ－１８１３．５％（５／３７），联合应用ＨＰＶ－１６和ＨＰＶ－１８探针共同检测结果为８１％（３０／３７）。结果显示：我国宫颈癌的发生与ＨＰＶ感染密切相关，联合应用高危型ＨＰＶ探针可提高检出率并可省时、简便。ＤＩＧ标记探针因具特异、敏感、安全和简便诸特点，宜推广应用。     

Performance Potential and Power Consumption of Slow-Active Suspension Systems with Preview

Two possible layouts of a slow-active suspension model are analysed. Optimal control laws for different actuator bandwidths and various amounts of road preview are generated, and estimates of power consumption are made. Higher bandwidth systems (10Hz) require less preview to obtain a given level of performance than those with a lower bandwidth (3Hz) but use more energy in doing so. Similar performance is available from the two systems considered, although the second uses considerably less energy to obtain that performance.     

中国沿海(散货)运输市场月评

本期沿海运输市场行情在煤炭、粮食运价持续上扬的推动下一路上行。11月14日，上海航运交易所发布的沿海（散货）运价指数报收于2281．12点，较上月同期上涨6．64％．综合运价指数再创历史新高。煤炭和粮食运价指数较上月继续上涨，成品油运价指数也略有上扬，原油运价指数基本保持平稳：     

国有铁路建筑业工资总额变动分析

对国有铁路建筑业工资总额变动的原因进行了客观和理性的分析；对今后加强工资的科学管理提出自己的见解。