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关键词： Gas separation   TCDB-based copolyimide   Charge transfer complex   Plasticization resistance  

摘要： The structural engineering and design of 6FDA/BPDA-based copolyimide membranes at a molecular level are developed to achieve advanced membrane materials with improved CO2 plasticization resistance as well as high gas separation performance. The commercially available diamine monomers with/without various electronegative groups (-CH3, -CF3 and -Cl) have been employed to prepare 6FDA/BPDA-based copolyimides via the one-step method. All of the copolyimides show excellent solubility in the common solvent, film-forming ability and thus mechanical properties. More interestingly, the intermolecular charge transfer complex (CTC) effects is finely tuned as confirmed by the fluorescence emission spectrum. The introducing of polar chloride groups in the copolyimides could significantly strengthen the CTC effects to prevent the intrusion of condensable CO2 and limit polymeric chain movements. Thus, the membrane based on the 2,2',5,5'-tetrachlorobenzidine (e.g. 6FDA:BPDA-TSN:TCDB (1:1:1:1)) shows the best carbon dioxide (CO2) plasticization resistance and slowest physical aging without sacrificing gas separation performance versus the membrane having weak polar groups. The CO2 plasticization pressure as high as 350 psi has been observed for the 6FDA:BPDA-TSN:TCDB membrane with polar chloride groups. This value is much higher than that of the copolyimide membranes with -CH3 or -CF3 groups ranging from 100 psi to 200 psi. Moreover, this membrane shows a good gas separation performance, e.g. CO2 permeability of 45.7 barrer and CO2/CH4 ideal selectivity of 35.2 surpassing the commercial cellulose acetate and Matrimid. Such structurally defined polymer with good mechanical strength, plasticization resistance and solubility harnesses the full potential of promising gas separation membrane materials for hollow fiber spinning. This work offers structural engineering guidance for the preparation of high-performance polymers with good tolerance to CO2-induced plasticization.

关键词： DFT calculation   Delamination   Photocatalysis   Supramolecular self-assembly   Tubular g-C(3)N(4)  

摘要： Morphology adjustment is a feasible method to change the physicochemical properties of photocatalysts. The issue that excessively thick tube wall of tubular g-CN is not conducive to the electron migration from inside to the surface thus inhibiting the separation of photogenerated carriers has always been ignored. Potassium ions were used to regulate the structure of the tubular supramolecular precursor by breaking hydrogen bonds, thereby promoting the synthesis of delaminated laminar tubular g-CN (K-CN), which not only shortened the transfer distance of photogenerated electrons but also provided abundant reaction active sites. Experiments and DFT calculations were combined to reveal the details of the physicochemical properties of K-CN. The photocatalytic capacity of K-CN for tetracycline hydrochloride (TCH) degradation and HO generation were 83% and 133 μM, respectively. This work not only synthesized a novel delaminated tubular g-CN but also provided a strategy and inspiration for structure and performance optimization for tubular g-CN.

关键词： 生物分离工程   课程思政   教学案例  

摘要： 《生物分离工程》课程是生物工程专业的专业核心课程。根据课程特点和内容,精心设计教学过程,寻找课程中的切入点,深挖德育教学案例,把课程思政内容融入到课程中的知识点中,发挥课程教学的双重育人功能。在德育教学中培养学生科学素养、职业素养和人文素养;引导学生树立正确的人生观、世界观、价值观;鼓励学生坚定信念、刻苦学习,对时代重任有勇于担当的责任。实现立德树人的总体目标。

关键词： 在线课程   制药工程   创新型   主动性   研究型教学  

摘要： 为提高制药工程专业学生学习的主动性和创新性,提高课堂教学效果,在网络课程的建立、互联网授课资源的选取、网络教学的过程管理与效果评测和研究型创新案例的设计等四方面对制药分离工程课程进行了精心设计与研讨。

关键词： 生物分离工程   工程教育专业认证   产出导向(OBE)   教学设计  

摘要： "生物分离工程"是生物工程专业的核心课程,是一门综合性、实践性、工程性极强的课程。为适应工程教育专业认证的新形势,基于"学生中心、产出导向(OBE)和持续改进"的核心理念,确定了课程教学目标及对毕业要求指标点的支撑,设计了新的"生物分离工程"教学过程,优化了课程教学改革方案和课程考核体系,在分析课程考核结果的基础上提出课程持续改进方案。本文可为工程教育认证背景下课程的教学设计与实施提供理论参考。

关键词： 生化分离工程   食品专业   教学改革   应用型本科院校  

摘要： 专业选修课开设的目的是为了扩展学生知识面,启发学生创新思维,拓宽学生的就业领域。"生化分离工程"是食品科学与工程专业的一门重要的专业选修课。随着生物技术的快速发展和生物技术产业崛起,生化分离技术日益受到重视,生物技术人才也备受企业青睐。地方性应用型本科院校为培养具有创新能力、符合企业需求的高素质人才,对"生化分离工程"的教学改革必不可少。通过革新教学内容和教学方法、改革课程考试方式等方式进行课程教学改革,激发学生兴趣,提高教学成效,为食品专业毕业开拓更宽的就业领域奠定基础。

关键词： 叠层隧道   分离式隧道   出入口匝道   工程设计  

摘要： 出入口匝道布置方案的选择是城市快速路工程总体方案的设计关键,将直接影响快速路的交通功能和总体效益的发挥。红线宽度满足要求的情况下,出入口应尽量布置在隧道两侧,进出便捷,同时施工难度较小。在阳澄西湖南隧道工程设计过程中,受到现状建筑物及规划红线的限制,创新性地提出了上下叠层隧道展线设计,有效解决了匝道展线宽度与长度不足的难题,并集约布置了隧道地下设备用房等,对类似工程的设计和施工有所借鉴意义。

关键词： 杭宁高速   分离式立交桥   钢箱梁   涡激振动特性   风洞试验   涡振区  

摘要： 为研究钢箱梁涡激振动特性,以德清县长虹街东延工程为例,采用风洞试验的方式,研究3种工况下的杭宁高速分离式立交桥钢箱梁涡激振动特性,并采用空间MIDAS/Gen有限元程序计算各个工况下钢箱梁处于不同位置时的应力情况。试验结果表明,在攻角为4°和6°时,振幅变化明显,波动较大;风速在18~27 m·s^(-1)和31~40 m·s^(-1)时,竖向和扭转2种涡激振动发生显著的振幅波动并产生涡振区;在上侧风和下侧风2种风向下,钢箱梁涡激振动的振幅峰值产生在风速为20~30 m·s^(-1),并产生涡振区,且所有的涡振区均在允许的振幅范围内;3种工况下,钢箱梁处于不同位置下产生的最大应力值和变形应力值均在规范标准内。

关键词： Construction   Time-cost trade-off problem   Multi-objective optimization   Metaheuristic algorithms   Time-cost optimization  

摘要： In this paper, four new adaptive weight formulations are developed to enhance the performance of traditional Modified Adaptive Weight Approach (MAWA), which is the simplest way for solving the multi-objective optimization of discrete time-cost trade-off problem (DTCTP). Several numerical experiments are conducted to validate the newly proposed formulations. In addition, three meta-heuristic-based optimization algorithms are utilized to examine the variations within the results of the test instances. The proposed model provides several ways to solve DTCTP, as it includes different formulations and optimization algorithms. So, this model performs well for the medium and large-scale time-cost optimization problems on contrary to the traditional MAWA.