气缸套支承肩产生裂纹的原因分析及防止措施

针对某型柴油机气缸套支承肩产生裂纹的现象,根据支承肩受力设计原理进行分析,提出相应的防止措施。     

如何编制公路交通施工计划

施工计划是项目开始的首要任务,从如何编制计划进行分析,结合计划的落实与检查,保证工程最终目标的实现.     

An analysis of decision-making processes in multicultural maritime scenarios

With three research studies recently carried out the pros and cons of multicultural, multilingual crews have given a 'second' food for thought:

• The Seafarers' International Research Centre (SIRC): 'Transnational Seafarer Communities' and the research, 'Finding a balance: companies, seafarers and family life', linked to this [1]. The latter presented in Maritime Policy & Management, no. 1, January-March 2003.
• The Swedish National Maritime Museum (SNMM): Isolde av Singapore [2]. This research and sociological documentation will be reviewed in a later issue of Maritime Policy & Management.
• Horck, J., 'A culturally mixed student body; the WMU experience in fostering future decision makers' [3].

There is a growing conviction among seafarers and persons working in the land-based sector of the maritime industry (including ex-seafarers) that staff onboard and on shore should be prepared to work with crews and groups whose members come from different countries and cultures and speak different languages. The problem, though, is which culture will have to surrender and which will dominate? Will a third culture become the norm for common survival? Perhaps to understand oneself and be knowledgeable about others is a better way to avoid eventual conflicts.

There are nearly no research findings on how a programme should comprise the aims of facilitating comprehension and appreciation of influences, from differences in cultural backgrounds, on group performance and decisions.

This paper reports on the research carried out on students in the Shipping Management and the Maritime Education and Training courses at World Maritime University (WMU). How do post-graduate students holding unlimited certificates of competency, as well as holders of university degrees with experience in the maritime industry and maritime administration, come to a consensus decision?

The findings in this research are discussed in balance with the results from both the SIRC and the SNMM research which is interesting because the results, in some significant issues, are not the same.

A phenomenographic approach has been used to find out that a multicultural group is not free from working problems. Can cultural differences, perhaps, be developed from an assumed hindrance into a catalyst for stimulating national appreciation and cooperation? Perhaps the opposite is true; it might be a bottleneck for improvements in safety as formulated in the STCW95 and the ISM Code.     

Potential of Real-Time Cylinder Pressure Analysis by Using Field Programmable Gate Arrays

In this paper, a Field Programmable Gate Array (FPGA) was used to implement a real-time cylinder pressure analysis. The goal of the project was to improve the accuracy of calculated heat release and center of combustion calculations to enhance the precision of engine control functions. Compared to today’s real-time pressure analysis systems, several additional physical effects were taken into account for this objective. The wall heat transfer was calculated based on the approach published by Hohenberg. A chemical equilibrium with six substances was assumed for the mixture composition and a real-time calculation method was developed. Furthermore, a two-zone model was adapted and implemented for this realtime analysis. The validation of the results and the rating of the improvement in precision were based on GT-SUITE simulation results as an offline reference tool. Compared to state-of-the-art analysis systems, it was possible to reduce the average error of the center of combustion position from 1.6° to 0.5° crank angle (CA) by taking the investigated effects into account. Moreover, it was possible to significantly reduce the time required for the calculation from one complete combustion cycle to 0.2°CA at an engine speed of 3,000 rpm by using a continuous calculation method on the FPGA. This led to an additional improvement of the ability to control the engine, especially under highly dynamic operation conditions.     

Risk and reward in public transportation contracting

The workshop discusses and documents a number of countries’ experiences regarding risk and reward in the delivery of public transport and determines the way in which competitive pressures actually work (or not) to deliver efficient and effective services. Papers are grouped into three main themes, i.e., public versus private management; negotiated versus competitively tendered contracts; and measures to improve performance. This chapter begins with a brief overview of each of the eight papers. This is followed by a section that out the discussions that emanated from the papers. Finally, the main policy and research recommendations are presented.     

Fixed‐route taxi system: route network design and fleet size minimization problems

This paper introduces the taxi route network design problem (TXRNDP) for a fixed‐route taxi service operating in Iran and, in similar form, in various other developing countries. The service operates fairly similar to regular transit services in that vehicles are only permitted to follow a certain predetermined route on the network. The service is provided with small size vehicles and main features are that vehicles only depart if full and that there are no intermediate boarding stops. In Iran the service attracts a high modal share but requires better coordination which is the main motivation for the present study. We develop a mathematical programming model to minimize the total travel time experienced by passengers while constraining the number of taxi lines, the trip transfer ratio and the length of taxi lines. A number of assumptions are introduced in order to allow finding an exact rather than heuristic solution. We further develop a linear programming solution to minimize the number of taxis required to serve the previously found fixed‐route taxi network. Results of a case study with the city of Zanjan, Iran, illustrate the resulting taxi flows and suggest the capability of the proposed model to reduce the total travel time, the total waiting time and the number of taxi lines compared to the current taxi operation. Copyright © 2016 John Wiley & Sons, Ltd.     

The slippery slope of lot consolidation in the Santa Monica Mountains: A program assessment

Abstract

The authors present an assessment of the Coastal Conservancy's efforts to consolidate small, substandard lots in the Santa Monica Mountains. Emphasis is placed on the ‘ ‘lessons learned’ ‘ by the Conservancy in its project experience as those lessons may be applicable to related efforts elsewhere. Finally, alternative means of lot consolidation are suggested. This assessment should be of relevance to other programs nationwide to address the problem of antiquated subdivisions.