Photoshop照片处理初探

人们在日常生活中使用相机拍摄而得到的照片,其效果并不一定特别理想,我们需要对其进行修复,以达到最佳效果。文章针对照片的常见缺陷讲述使用Photoshop修复照片的实用技术。     

快速固化高分子路面修复材料的研制及抗压性能研究

目前国内外对突遭破坏性公路、机场的修复方法主要是利用沥青、水泥混凝土等进行现场灌注修补，经一段时间的养生后重新投入使用。一种使用高分子材料和无机原料直接将沙（砂）土快速固化来修补各种路面的方法，具有材料固化速度快、与路基粘接性好、施工操作简单、耐候承压能力强等特点，是一种较为理想的补路材料，在实际应用中具有较为广阔的前景。     

制定旧油管检修标准确保检修质量

阐述了旧油管检修中存在的诸多缺陷，检修质量得不到保障，下井后出现无序失效的质量事故。指出，制定旧油管检修标准，是提高检修质量，延长作业周期，降低作业费用，确保油田生产的根本途径。     

Periodical Replacement Model for a Multi-Unit System Subject to Failure Rate Interaction

A periodical replacement model for a multi-unit system subject to failure rate interaction between units is presented. In a N-unit system, one is dominant unit and the others are secondary units. When a secondary unit fails, it increases the failure rate of the dominant unit by some amount, while the failure of dominant unit make the system into total failure. Without failure rate interaction, the failure rates of all units also increase with age. All single failures of secondary units are assumed to be corrected by minimal repairs. The system is replaced at age T, or on total failure, whichever occurs first. The aim of this paper is to derive the expected cost rate per unit time as a criterion of optimality and to seek the optimal period T ^* to minimize that cost rate.     

利用互联网技术提高图书馆后勤管理水平

从后勤管理的概念入手,分析了当前各图书馆后勤保障服务现状及存在的问题,最后以构建“西安交通大学图书馆网上报修系统”为例,说明现代互联网技术不仅可以为读者提供各类文献信息服务,而且也可用来提高图书馆的后勤管理服务水平。     

遗传物质DNA的复制合成

文章结合相关的酶,介绍了DNA复制的性质、DNA复制过程的4个逻辑阶段以及DNA复制过程出现异常或损伤后的修复,为熟悉细胞分裂过程中信息遗传提供帮助。     

井壁修复器的研制与应用

胜利油田多区块地层易出现缩径造成"卡脖子"现象,目前处理此类复杂的措施不能很好地解决该项难题。针对这种情况,研制了井壁修复器快速处理和预防坍塌缩径,通过井壁修复器的使用,实现了复杂问题简单化,既保证了处理的安全可靠性,又降低了损耗,提高了时效,具有较高的现实推广意义。     

塑料注塑模的调试

塑料模具是塑料制品的基础,是影响塑件质量及生产效率的最关键因素,约占80%。因此把握好塑料模具的安装与调试至关重要。本文主要阐述了塑料模具之一注射模在注射机上的安装之后的调试过程。     

Factors impacting the demand for repair services of household products: the disappearing repair trades and the throwaway society

The repair trades for common household appliances and products were once a viable trade in America, employing hundreds of thousands of skilled blue‐collar workers. However, over the past few decades, these trades have been dying out. The reason is that many household products are simply disposed of rather than repaired and reused, a result of the throwaway society. The disposal of household products, especially those considered ‘e‐waste’, can have negative consequences for the environment. Through time series analysis, this paper explores those factors that contribute to the decline in demand for repair services and, hence, the shrinking demand for employment within the repair trades. The purpose of this paper is to give the reader a greater understanding of those economic forces that contribute to a throwaway society.