铁路噪声对沿线居民影响的研究

分析了铁路沿线居民对噪声的反应，并比较了铁路与交通运输噪声主观反应。结果表明，无论是高干扰率阈值的比较，或是从高干拢率与声级的回归方程比较，铁路和交通这两种运输噪声对人的主观反应干扰基本一样。     

多形体筛查

开发一种药物并将其推入市场并不是一件容易的事情，尤其是我们当前所处的环境是在西方的生产标准之下。法律环境和公众意念都对制造业有了很强烈的要求。很少有其它的行业，在被要求快速无误工作的同时，还要面对如此详细的审查和规章制度。那些因操作程序或设计不精确导致后期药物研发终止或临床试验冗余的公司，面临着艰巨的增加上市产品、树立和维持投资者信心的挑战。     

Potential last-mile impacts of crowdshipping services: a simulation-based evaluation

Transportation - Crowdsourced delivery services (crowdshipping) represent a shipping alternative to traditional delivery systems, particularly suitable for e-commerce. Although some benefits in...     

An Active Pantograph with Shaped Frequency Response Employing Linear Output Feedback Control

In pantographs used for current collection on high speed electric trains it is desirable to minimise the fluctuations in the contact force between the collector head and the catenary. A simple two-mass linear model is employed for the pantograph and the design of the proposed control system is based on the input admittance at low frequencies. Frequency shaping is incorporated in the performance index, and a simple dynamic controller is employed to achieve optimality in an equivalent transformed system, while minimising the number of feedback quantities to be measured. A significant reduction in the average contact force appears possible.     

Mixing in the surface boundary layer of a tropical freshwater reservoir

A combined observational-modeling study was conducted to investigate turbulence mixing, and the relation to surface forcing, in the surface boundary layer (SBL) of a tropical, high-altitude, freshwater reservoir. A suite of vertical profiles of temperature microstructure, collected at three different stations of one-day duration each, provided estimates of dissipation rates of turbulence kinetic energy, , and temperature variance, χ. Numerical simulations of and χ, using state-of-the-art, public domain, two-equation turbulence closure models, compared favorably with the observations and reproduced the dynamics of daytime wind mixing as well as the vertical and temporal turbulence structure during nighttime convective conditions.Two independent estimates of vertical eddy diffusivities in the stably stratified (daytime) SBL, computed from the microstructure measurements, agreed closely, and the near surface heat and buoyancy fluxes, computed from the diffusivities, were similar to those computed independently from surface meteorology. Model generated eddy diffusivities agreed closely with the observed values, except those generated by K profile parameterization (KPP) model simulations. The good agreement provides confidence that nutrient fluxes in the SBL may be accurately computed from the models when forced with regularly measured surface meteorological parameters. The consequences are important for estimation of daily primary productivity rates in the euphotic zone and the ability to predict algal blooms such as those observed in the present reservoir.     

Estimation of the Non-Linear Suspension Tyre Cornering Forces from Experimental Road Test Data

The paper discusses the application to real data of an identification procedure based on an Extended Kalman Filter, for estimating the equivalent non-linear suspension tyre cornering forces of a road vehicle from a single standard manoeuvre. In particular, both the steady-state and the dynamic handling characteristics can be evaluated.     

The role of accident exposure in transport system safety evaluations I: Intersection and link site exposure

Realistic predictions of the likely safety performance of advanced transport systems will need to draw on the knowledge accumulated from a large number of safety evaluations which have already been undertaken for existing transport systems. In particular, safety evaluations of future technologies must avoid the methodological pitfalls experienced in extensively researched areas, such as road safety, if such evaluations are to be meaningful. This paper reviews the use of exposure for a broad range of road safety studies, and concludes that unsatisfactory treatment of exposure is a common failing in past evaluations of the effectiveness of road accident countermeasures. Whilst a broad range of safety analyses is discussed, the use of exposure in site safety studies is emphasized. A follow-up paper will extend the discussion to other aspects of accident exposure including exposure measures for large groups of transport system users.     

The problem of universal acceptability of the Convention on a Code of Conduct for Liner Conferences

In light of the Reveiw Conference on the UN Code of Conduct for Liner Conferences to be in November 1988, this paper highlights some of the Major problems impinging upon the universal acceptability of the Code. These include the reservation (known as the Brussels Package) by EC and certain other OECD countries that discriminates aganist developing and Socialist countries; reservations of a controversial nature with regard to the establishment of joint shipping lines established on the basis of intergovernmental bilateral agreement; and the question of compctition by non-conference lines that diminishes the share of cargo available to National Lines by virtue of the Code.