铁炉港采石场二期工程深孔台阶爆破实践

铁炉港采石场二期工程采用深孔台阶爆破,日爆破方量达3万m3,地质条件不利,而对块度要求非常严格。根据可爆性将岩石分为三类,采用不同的穿孔爆破参数。通过试生产期间的数据统计和分析,建立了孔网参数和炸药单耗与粉矿率、大块率及根坎率的关系,为穿孔爆破参数优化提供了依据。通过成本分析得知,控制爆破成本的主要措施是降低粉矿率。     

Tencel细号紧密纺产品上浆工艺实践

总结Tencel 9.7 tex紧密纺品种上浆工艺要点。根据品种特点,对浆料配方、浆液浓度、上浆率、压浆力、车速进行工艺试验与优选,重点对上浆温度和烘筒温度进行了调整与试验,并在此基础上进一步改进操作方法,使上浆质量提高,织机效率达到较好水平,且用汽成本也大幅降低。指出:推广中低温上浆工艺可以达到节约能源和成本的目的,是纺织企业节能减排的一项重要举措。     

智能三维机织玄武岩纤维复合材料的制备

探讨智能三维机织玄武岩纤维复合材料的制备方法。原料采用以800 tex有捻玻璃纤维纱为经纱、2 000 tex玄武岩纤维无捻粗纱为纬纱以及以直径为0.7 mm的康铜电阻丝,通过VARTM成形工艺,开发设计了智能三维机织玄武岩纤维复合材料,并对其应变丝电阻的变化进行了检测。认为:在普通织机上经适当改造,便能开发生产带电阻丝的三维机织玄武岩纤维预制件;通过VARTM成形工艺,把带电阻丝的三维机织玄武岩纤维织物与不饱和聚酯树脂复合成形,制成具有感知负载功能的敏感智能复合材料,工艺简单,成本低。     

浅谈PCB半孔多制程的加工

为满足产品装配的需要,PCB半孔设计应运而生,文章介绍了多种加工工艺半孔的实际过程,在不同加工条件下对于不同的工艺要求对我们传统的工艺流程进行相应的调整、解决所有工艺方面存在的难点,有效的提高制程加工能力,达到批量生产目的,对工序的实现过程做大量的可行性试验和需要注意的细节要素控制,最终完成半孔的加工。     

Gestörter Bauablauf — Baubetriebliche Ermittlung von Bauzeitverlängerungen und Berechnung der Mehrkosten

Der Nachweis des gestörten Bauablaufs ist die schwierigste Herausforderung für Baubetriebler. Dies liegt nicht nur an der Komplexität gestörter Bauabläufe großer Projekte, sondern vor allem an den Anforderungen, die Baujuristen an den Nachweis stellen. Disturbed construction process — Determination of extra construction time and calculation of the additional costs of construction. The detection of the disturbed construction process is the most difficult challenge for construction managers. This is not only because of the complexity of disturbed construction processes of large projects, but primarily because of the requirements of demonstration for the legal experts in construction.     

基于Top-k查询约束的深网增量爬取*

深网数据源的动态性、自治性和体量使第三方应用难以完全爬取所有Web数据.文中研究查询类型(仅允许Top-k查询)和查询资源约束下深网数据源爬取问题,提出基于Top-k查询约束的深网增量爬取方法,结合历史数据和领域知识,优化总体数据质量.首先基于查询树获得有效查询,利用历史数据和领域知识估计查询变化和查询代价.然后,基于估计的查询代价和数据质量,近似选择最优的查询子集最大化总体数据质量.实验表明文中方法较好地提高动态Web数据库爬取的效率和数据质量.     

Economic Viability of Pilot-Scale Application of Ozone in Cotton Bleaching with Multiple Reuse of Water

In this research, potential of reusing bleach water bath was examined with respect to its effect on whiteness of the cotton fabric exposed to 50 g/h of ozone on pilot scale for 45 min with 3 kg of fabric charged fresh at each trial, along with the evaluation of the economic viability of this technology in terms of profit per batch as well as profit per unit product (fabric) computed by Cost of Goods Sold statement. Results have shown that water can be reused with insignificant change in whiteness, revolving around 54% and 60%, and that it harnesses a 7 Rupees profit per unit fabric or 21 Rupees profit per cycle, which seems quite acceptable at existing bleached fabric sale price.     

Enhanced exergy cost optimization of operating conditions in FCCU main fractionator

Exergy indicates the maximal energy that can do work effectively. Different from optimization of product quality or calculation of generic energy conservation in most previous studies, the application of exergy analysis and exergy cost optimization in petrochemical industry is of great economic and environmental significance. Based on the main fractionator in Jiujiang Petrochemical Complex No. 2 FCCU, an enhanced exergy cost optimization under different operating conditions by adjusting set points of temperature and valves opening degree for flow control is studied in this paper in order to reduce exergy cost and improve the quality of energy. A steady-state optimization algorithm to enhance exergy availability and an objective function comprehensively considering exergy loss are proposed. On the basis of ensuring the quality of petroleum products, the economic benefits can be improved by optimizing the controllable variables due to the fact that exergy cost is decreased.     

Cost analysis of different solar still configurations

The enhancement of the productivity of the solar desalination system, in a certain location, could be attained by a proper modification in the system design. Therefore, different design configurations could be found in literatures. However, the increase in the system productivity with high system cost may increase also the average annual cost of the distillate. Cost analysis of different design configurations of solar desalination units is essential to evaluate the benefit of modification from the economical point of view. The main objective of this work is to estimate the water production cost for different types of solar stills. In this paper 17 design configurations are considered. Systems with higher and lower values of productivity are considered in this investigation. A simplified model for cost analysis is applied in this study. The results show that, the best average and maximum daily productivity are obtained from solar stills of single-slope and pyramid-shaped. The higher average annual productivity for a solar still is about 1533 l/m² using pyramid-shaped while the lower average annual productivity is about of 250 l/m² using modified solar stills with sun tracking. The lowest cost of distilled water obtained from the pyramid-shaped solar still is estimated as 0.0135 $/l while highest cost from the modified solar stills with sun tracking is estimated as 0.23 $/l.     

Cost benefits analysis and emission reductions of optimum thickness and air gaps for selected insulation materials for building walls in Maldives

The demand for electricity in the Maldives continues to increase by more than 11% in recent years. This is mainly due to the growing number of high-rise air-conditioned buildings and the increasing use of electrical appliances in the residential and commercial sector. This paper investigates potential cost savings and emission reductions achieved by installing different insulation materials of optimum thickness in building's walls. The paper also investigates the effect when air gaps are introduced in the wall. The optimum insulation thickness is based on the cost benefits of each insulation material over its lifetime. This study found that by introducing optimal thickness of different insulation materials and by having air gaps of 2 cm, 4 cm and 6 cm, energy consumption and emissions can be reduced by 65–77%, in comparison to a wall without insulation or air gaps. And, hence have considerable cost savings.