浅析高速公路透层、稀浆封层的质量控制

公路透层、稀浆封层技术作为一种经济有效的预防性技术手段在高速公路建设中被推广应用.总结了高速公路透层、稀浆封层的施工经验,对透层、稀浆封层的主要技术指标进行了分析,并指出了透层、稀浆封层施工后的质量通病以及确保施工质量所采取的关键措施.     

Integration of reconfigurable inspection with stream of variations methodology

This paper describes an advanced closed loop quality control methodology for reconfigurable manufacturing systems. The methodology enables rapid root-cause diagnostics for faster ramp-up of reconfigurable systems through integration of the Reconfigurable Inspection Machine (RIM) and the Stream of Variations (SoV) methodology. The RIM enables reconfigurable, rapid, and accurate inspection using non-contact sensors while the SoV methodology is used to quickly analyze the measurements and identify the root-cause of the errors produced during machining.The feasibility of the industrial concept was experimentally validated. A machining error was introduced during machining of an engine head. Measurement information collected by the RIM was processed and used to locate the root-cause of the error using the SoV methodology.     

多层次立体式营销模式的探索和实践

文章阐述了国有煤气制气公司在市场经济环境下，经过探索和实践建立起多层次立体式营销模式，为公司降本增效作出了贡献。     

Energy use efficiency in the Indian manufacturing sector: An interstate analysis

This paper approaches the measurement of energy efficiency from a production theoretic framework and uses Data Envelopment Analysis to measure energy efficiency in the Indian manufacturing sector. Using data from the Annual Survey of Industries for the years 1998–99 through 2003–04, the study compares the energy efficiency in manufacturing across states, based on several models. The results show considerable variation in energy efficiency across states. Comparing the results across our models, we find that the relative pricing of energy does not provide the appropriate incentives for energy conservation. A second-stage regression analysis reveals that states with a larger share of manufacturing output in energy-intensive industries have lower energy efficiency. Also, higher quality labor force associates with higher energy efficiency. Finally, the power sector reforms have not yet had any significant impact on achieving energy efficiency.     

Integrated analytical models for flexible manufacturing systems

Product form queueing networks (pfqn) and generalized stochastic Petri nets (gspn) have emerged as the principal performance modelling tools for flexible manufacturing systems (fms). In this paper, we present integratedpfqn-gspn models, which combine the computational efficiency ofpfqn and representational power ofgspn by employing the principle of flow-equivalence. We show thatfms that include nonproduct form characteristics such as dynamic routing and synchronization can be evaluated efficiently and accurately using the integrated models.     

Experimental studies on selective laser melting of metallic parts

Laser assisted generative production techniques like Selective Laser Melting (SLM) are novel but complex near net shape fabrication methods. The present paper describes properties of metallic specimens generated by SLM. Therefore various process parameters were observed to evaluate their influence on certain attributes of parts fabricated by Selective Laser Melting. In addition, approaches for an improvement of density, surface quality and mechanical properties are given.     

A clustering approach for minimizing intercell trips in cell formation

Excessive intercell trips in a cellular manufacturing system may minimize the benefits that the system can provide. Hence, this research develops a non-linear integer formula to reduce intercell trips in a cell type system design. A clustering algorithm is then developed to obtain a satisfactory solution to the proposed cell formulation problem. To determine the performance of the proposed clustering algorithm, comparisons are made with an Exhaustive Search (ES) algorithm to show the relative optimality.     

Electron beam sintering of metal powder

The laser is widely used in additive layer manufacturing for producing parts on the basis of polymer and metal powder. In the metal area, the capacity of laser technologies is noticeably exhausted. The electron beam (eb) technology offers higher power density and beam velocity and therefore seems more suitable for sintering high-tensile steel powder in an economic way. In this paper, a comprehensive method is implemented to develop the eb sintering. In comparison to laser-based applications, different physical effects occur and have to be controlled. Therefore, the paper focusses on those physical effects and the measures, which have to be taken in order to achieve a reliable process. The result of this work is a prototype machine, in which the eb is used for sintering high-tensile steel directly from CAD files to three-dimensional, non-porous parts.