70500系列调节阀在大型尿素装置中的应用

介绍Ｍａｓｏｎｅｉｌａｎ公司生产的７０５００系列调节阀的结构，特点，并阐述部分调节阀在使用中存在的问题及改进措施。     

基体树脂对长玻璃纤维增强PP力学性能的影响

采用在线混合设备制备了长玻璃纤维(LGF)增强聚丙烯(PP)复合材料(LGF-PP),研究了基体性质及界面相容剂对LGF-PP力学性能的影响。基体树脂熔体流动速率的增加,使最终LGF-PP中的玻璃纤维长度从5.63 mm增至8.56 mm,提高了力学性能。与均聚PP比较,以共聚PP为基体树脂的LGF-PP冲击强度高出约10%,但其他性能略差。界面相容剂有利于增强玻璃纤维与PP的界面结合,拉伸强度和拉伸模量明显增加,但是冲击强度降低了20%～30%。     

坯料组成与瓷坯力学性能关系的研究

以长石质瓷为对象，分别研究了坯料的化学矿物组成和颗粒组成的变化与瓷坯抗折强度的关系，利用XRD、SEM等分析手段，探讨了坯料组成及生产工艺制度对瓷坯的岩相组成、显微结构、力学性能的影响。     

过氧化甲乙酮合成研究

研究了在酸性催化剂存在下，以邻苯二甲酸二丁酯作溶剂，由双氧水和甲乙酮作用制取过氧化甲乙酮溶液的工艺，并得到最佳工艺条件。结果表明，产品性能优良。     

An interval programming approach for the bilevel linear programming problem under fuzzy random environments

In this paper, we address a class of bilevel linear programming problems with fuzzy random variable coefficients in objective functions. To deal with such problems, we apply an interval programming approach based on the $\alpha $ -level set to construct a pair of bilevel mathematical programming models called the best and worst optimal models. Through expectation optimization model, the best and worst optimal problems are transformed into the deterministic problems. By means of the Kth best algorithm, we obtain the best and worst optimal solutions as well as the corresponding range of the objective function values. In this way, more information can be provided to the decision makers under fuzzy random circumstances. Finally, experiments on two examples are carried out, and the comparisons with two existing approaches are made. The results indicate the proposed approaches can get not only the best optimal solution (ideal solution) but also the worst optimal solution, and is more reasonable than the existing approaches which can only get a single solution (ideal solution).     

Texaco与Lurgi煤气化工艺的比较

介绍Ｔｅｘａｃｏ煤气化工艺与Ｌｕｒｇｉ煤气化工艺，并从工艺、设备、气化对煤种和煤质的要求、灰水处理及工艺消耗等方面进行比较分析。     

膜内介质传递现象

论述了组分在膜分离过程中的传递行为。简要论述了介质通过膜的途径，对膜传递过程中所产生的理论体系进行归纳和解释，并对其内在联系进行总结；最后根据介质与膜的相互关系，把组分在均质膜中的传递过程分为理想扩散过程、弱相互作用扩散过程、强相互作用扩散过程，并分别进行探讨。     

The topological basis realization and the corresponding Heisenberg model of spin-1 chain

In this paper, it is shown that the Heisenberg model of spin-1 chain can be constructed from the Birman–Wenzl algebra generator while we have got that the Heisenberg model of spin- $\frac{1}{2}$ chain can be constructed from the Temperley–Lieb algebra generator in our previous work (Sun et al. in EPL 94:50001, 2011). Here, we investigate the topological space, we find that the number of topological basis states raise from the previous two to three, and they are also the three eigenstates of a closed four-qubit Heisenberg model of spin-1 chain. Specifically, all the topological basis states are also the spin single states and one of them is the energy single state of the system. It is worth noting that all conclusions we get in this paper are consistent with our previous work (Sun et al. in EPL 94:50001, 2011). These just indicate that the topological basis states have particular properties in the system.     

DMTO – a method for Discrete Material and Thickness Optimization of laminated composite structures

This paper presents a gradient based topology optimization method for Discrete Material and Thickness Optimization of laminated composite structures, labelled the DMTO method. The capabilities of the proposed method are demonstrated on mass minimization, subject to constraints on the structural criteria; buckling load factors, eigenfrequencies, and limited displacements. Furthermore, common design guidelines or rules, referred to as manufacturing constraints, are included explicitly in the optimization problem as series of linear inequalities. The material selection and thickness variation are optimized simultaneously through interpolation functions with penalization. Numerical results for several parameterizations of a finite element model of a generic main spar from a wind turbine blade are presented. The different parameterizations represent different levels of complexity with respect to manufacturability. The results will thus give insight into the relation between potential weight saving and design complexity. The results show that the DMTO method is capable of solving the problems robustly with only few intermediate valued design variables.