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关键词： 泥砂分离   土石方   环境污染   预拌砂浆   固体废物  

摘要： 针对大型土石方工程泥土中含砂量大、固体废物排放多、资源利用率低、环境污染严重的问题,提出采用泥砂分离处理技术将泥砂经过分离机分离成泥和砂,洗出来的粗砂可用于喷锚支护结构的施工;级配砂运送至搅拌站,制作成预拌砂浆,用于排水等工程的砌筑、抹灰、装饰,达到资源再利用及保护环境的目的。

关键词： 制药   分离技术   制药工程  

摘要： 确保药物制取效果、质量,是对大众的生命健康安全的保障。所以,在制药工程领域做好制药分离技术的研究、选择是关键。因此,本文将对该议题进行详细的研究。

关键词： 油基岩屑   热相分离技术   工艺流程   经济分析  

摘要： 油基岩屑的综合利用是非常规天然气开采利用过程中的一项难题。本文论述了热相分离技术资源化处理油基岩屑的工程应用,详细介绍了工艺流程和设备等,分析了处理过程中废水、废气和废渣产生情况,并进行了整体工程的经济分析。使用热相分离技术对油基岩屑进行工程应用有非常重要的现实意义,为油基岩屑的资源化和无害化提供了解决方案。

关键词： 猪场废水   SBR   A/O   臭氧  

摘要： 近年来,随着环保标准和监管的日益严格,许多规模猪场废水处理工程面临改造升级。文章以福建某大型猪场废水处理改造工程为例,探讨了固液分离-SBR-A/O-臭氧组合工艺处理猪场废水效果,并进行了运行成本分析。由于该猪场采用了节水饲养工艺,导致目前猪场废水浓度很高,进水COD达17490 mg·L^(-1),氨氮达2051 mg·L^(-1),原工程处理出水COD在600 mg·L^(-1)以上,氨氮在500 mg·L^(-1)以上。经过改造后,3个月的运行结果监测表明,出水COD平均浓度150 mg·L^(-1),COD去除率99.1%;出水氨氮平均浓度13.3 mg·L^(-1),氨氮去除率98.1%。处理成本主要包括电费、药剂费和人工工资共计11.29元·m^(-3),其中电费占总运行成本的53.1%,药剂费用占总运行成本的40.4%,人工工资占总运行成本的6.47%。

关键词： 招投标   评定分离   推行缓慢   实施建议  

摘要： “评定分离”已在全国范围探索推行,其实施有利于突出招标人的主体责任,现实中却难以全面推广。文中总结了部分倡导推广“评定分离”的原因,梳理了“评定分离”难以全面推行的部分因素,结合工作实际提出了相关实施建议。

关键词： 评定分离   招标投标   建设工程   实施要点   实践  

摘要： 探究“评定分离”办法的实践策略;方法:分析建设工程招标投标过程中,“评定分离”办法的实施要点和重要性,确定定标原则和实施主体;结果:该种招投标办法充分发挥评标专家的作用,提升投标人的诚信意识,控制投标人不良行为,促进招投标过程中的公平竞争;结论:应该树立合理价值取向,选择合适的定标办法,根据招标文件规定,遴选优秀设计方案,确定最终中标人。

关键词： 制药工程   制药   分离技术  

摘要： 近年来,随着人们物质生活水平的不断提高,生活质量有了显著提高,人们对个人健康的关注度也越来越高。然而,近年来,由于自然环境问题和诸多因素的影响,人民的健康受到威胁,医学应用的重要性开始受到重视。为此,一些学者开始深入研究医药工程。药物分离技术是制药工程发展中的一个重要环节。因此,做好药物分离技术的应用与发展至关重要。

关键词： 教考分离   工程力学   课程实践  

摘要： 为深化地方院校本科教育教学改革,我校对2019级机械工程专业121名学生的工程力学课程开展了教考分离教学改革试点。成绩分析结果表明实施“教考分离”课程改革成效显著。实行教考分离,能够使教师注重教学研究,促使学生端正学习态度,形成重教重学的良好氛围,从而不断提升教学和学生培养质量。

关键词： metal-organic framework   C2H6/C2H4 separation   substituent engineering   ligand functionalization   heterofunctional ligand  

摘要： The preferential capture of ethane (C2H6) over ethylene (C2H4) presents a very cost-effective and energy-saving means applied to adsorptive separation and purification of C2H4 with a high product purity, which is however challenged by low selectivity originating from their similar molecular sizes and physical properties. Substituent engineering has been widely employed for selectivity regulation and improvement, but its effect on C2H6/C2H4 separation has been rarely explored to date. In this work, four isoreticular coordination framework compounds based on 5-(pyridin-3-yl)isophthalate ligands bearing different substituents were rationally constructed. As revealed by isotherm measurements, thermodynamic studies, and LAST computations, they exhibited promising utility for C2H6/C2H4 separation with moderate adsorption heat and a high uptake amount at a relatively low-pressure domain. Furthermore, the C2H6/C2H4 separation potential can be finely tuned and optimized via purposeful substituent alteration. Most remarkably, functionalization with a nonpolar methyl group yielded an improved separation efficiency compared to its parent compound. This work offers a good reference value for enhancing the C2H6/C2H4 separation efficiency of MOFs by engineering the pore microenvironment and dimensions via substituent manipulation.

关键词： Material logistics   Road construction   Discrete event simulation   Construction management  

摘要： Purpose Motivated by the high cost of material movements in road construction projects, past studies have used analytical methods to optimize materials logistics plans. A key shortcoming of these methods is their inability to capture the uncertain, dynamic and complex characteristics of the road construction material logistics. Failure to incorporate these characteristics can lead to sub-optimal results. The purpose of this study is to propose the use of discrete event simulation (DES) to address the existing shortfall. Design/methodology/approach Despite the powerful capabilities of DES models in capturing the operational complexities of construction projects, they have not been previously utilized to optimize the material logistics of road construction projects. The proposed DES-based method in this research captures the operational details of material logistics and uses a heuristic approach to overcome the combinatorial problem of numerous choices. The method was applied to a 63.5 km real-world road construction project case to demonstrate its capabilities. Findings Six different material types from 28 material sources were used in the case. Approximately 1.5% of the material logistics costs were saved by following the proposed method and choosing appropriate material sources. Originality/value This research contributes to the body of knowledge by leveraging the capabilities of DES and presenting a novel method for improving the materials logistics plan of road construction projects. The proposed method provides practitioners with the basis for capturing the key operational details that were overlooked in the past. The proposed method can be adopted in road construction projects to reduce the overall material procurement cost.