从废旧聚苯乙烯泡沫塑料中回收苯乙烯

本文采用有机溶剂甲苯作为消泡剂，用热裂解法从废旧聚苯乙烯泡沫塑料中回收苯乙烯，苯乙烯收率可达８０％以上。     

羟基磷灰石/β-磷酸三钙/海藻酸钠复合多孔支架的制备与研究

本文讨论了羟基磷灰石/β-磷酸三钙/海藻酸钠(HAP/β-TCP/AG)多孔支架的制备,并通过电子显微镜观察了其微观结构、研究其干细胞亲和性和生物相容性。研究表明:该多孔支架具有三维连通网状结构,干细胞在支架上黏附、生长良好,具有良好的干细胞亲和性和生物相容性。     

基于遗传算法优化的OCSVM双轮廓模型异常检测算法

针对Modbus工业总线协议的特殊性及工控数据样本的不均衡性,利用单类支持向量机（OCSVM）分别构建正常OCSVM模型和异常OCSVM模型,即双轮廓模态来模拟系统通信的正常模式和异常模式,从而实现工控系统异常检测。同时将遗传算法优化自变量降维应用于工控网络入侵检测场景,实现对输入自变量的降维压缩处理,防止OCSVM模型出现过拟合现象及分类准确率低的问题,提高异常检测的精度,缩减建模时间。通过仿真验证了该算法对工控网络异常检测的有效性。     

Graft copolymerization of styrene and acrylonitrile onto EPDM

Acrylonitrile–EPDM–styrene (AES) graft copolymers were synthesized by solution graft polymerization of styrene (St) and acrylonitrile (AN) onto EPDM in an n‐hexane/benzene solvent with benzoyl peroxide (BPO) as an initiator. The structure changes were studied by an FTIR spectrophotometer. The grafting parameters were calculated gravimetrically. The influence of the polymerization conditions, such as the reaction time, concentration of the initiator, EPDM content, and weight ratio of St/AN, on the structure of the products was investigated. It was found that a proper initiator concentration and EPDM content will give a high grafting ratio of the AES resin. The thermal property of the copolymer was studied using programmed thermogravimetric analysis (TGA). The results showed that the copolymer has a better heat‐resistant property than that of ABS, especially for the initial decomposition temperature (T_in) and the maximum weight loss rate temperature (T_max). Also, the mechanism of the graft reaction was discussed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 428–432, 2002     

Effects of the electrospray ionization parameters on the formation and morphology of colloidal microspheres of polyacrylonitrile

Polyacrylonitrile colloidal microspheres have been successfully prepared with different concentrations of electrospraying polyacrylonitrile solutions. The morphology of the colloidal spheres has two kinds of structures and is strongly affected by electrospray‐ionization parameters, such as the polymer concentration, applied voltage, and distance between the electrodes. The solvent can also affect the morphology of polyacrylonitrile. The optimum conditions for preparing colloidal spheres have been found, and differential scanning calorimetry results indicate that polyacrylonitrile colloid spheres are amorphous. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2889–2893, 2006     

二甲醚燃烧用掺杂钡、镍六铝酸盐催化剂的研究

二甲醚是易液化，便于运输，清洁化的新能源。当作为燃料使用时，采用催化燃烧的方法能使得燃烧的起燃温度降低和提高燃烧转化率，克服了普通燃烧的缺点，实现了清洁燃烧。对二甲醚催化燃烧用的催化剂BaNiAl11O19-δ进行了制备与研究。采用溶胶-凝胶法制备六铝酸盐催化剂BaNiAl11O19-δ,考察其对新能源二甲醚催化燃烧反应的活性，并用TG—DTA对催化剂的性质进行考察。结果表明，加入经800℃焙烧4h后又在1200℃焙烧了2h的催化剂，比未加催化剂的燃烧体系T10降低了50℃。用溶胶一凝胶法制备的六铝酸盐催化剂BaNiAl11O19-δ对二甲醚催化燃烧反应具有较高的催化活性。     

论环境陶艺空间的要素特性

环境陶艺空间有三大要素特征：其一，思维空间在环境陶艺空间中的特性；其二，环境空间在环境陶艺空间中的特性；其三．陶艺作品空间与心理空间在环境陶艺空间中的特性。通过以上分析，可以看出环境陶艺空间各要素之间相互作用、具有相互依存的空间系统化的关系。     

渭河中下游水文变异点识别及生态保障流量计算

针对水文变异引发的基于水文统计学的生态保障流量分析方法在实践应用上存在的问题,提出通过水文变异点分析找出受环境变化影响的转折年,以该年份之前的水文序列计算生态系统需要的保障流量的思路,可有效避免因水文变异而导致的水文统计学方法失效问题。以渭河中下游为例,通过累积曲线法和Mann-Kendall(M-K)检验法对渭河干支流7个关键控制断面进行水文变异点识别,并以此为基础,应用改进Tennant法计算渭河中下游各控制断面的生态低限流量与适宜生态流量。该成果可作为渭河开展流域综合治理和生态保护的参考数据。     

Quantum immune clonal coevolutionary algorithm for dynamic multiobjective optimization

The existing algorithms to solve dynamic multiobjective optimization (DMO) problems generally have difficulties in non-uniformity, local optimality and non-convergence. Based on artificial immune system, quantum evolutionary computing and the strategy of co-evolution, a quantum immune clonal coevolutionary algorithm (QICCA) is proposed to solve DMO problems. The algorithm adopts entire cloning and evolves the theory of quantum to design a quantum updating operation, which improves the searching ability of the algorithm. Moreover, coevolutionary strategy is incorporated in global operation and coevolutionary competitive operation and coevolutionary cooperative operation are designed to improve the uniformity, the diversity and the convergence performance of the solutions. The results on test problems and performance metrics compared with ICADMO and DBM suggest that QICCA has obvious effectiveness and advantages which shows great capability of evolving convergent, diverse and uniformly distributed Pareto fronts.     

Studies on syntheses and properties of novel CeO2/polyimide nanocomposite films from Ce(Phen)3 complex

A series of cerium dioxide (CeO₂)/polyimide (PI) nanocomposites were successfully prepared from Ce(Phen)₃ and polyamic acid (PAA) via the solution direct-dispersing method, followed by a step thermal imidization process. TGA and XPS studies showed that the cerium complex decomposed to form CeO₂ during the thermal imidization process at 300 °C. SEM observation showed that the formed CeO₂ as nanoparticles was well dispersed in polyimide matrix with a size of about 50-100 nm for samples with different contents of CeO₂. Thermal analysis indicated that the introduction of CeO₂ decreased the thermal stability of nanocomposite films due to the decomposition of Ce(Phen)₃ in the imidization process, while the glass transition temperature (T_g) increased obviously, especially nanocomposite films with high loading of CeO₂ exhibited a trend of disappearance of T_g. DMTA and static tensile measurements showed that the storage modulus of nanocomposite films increased, while the elongation at break decreased with increasing CeO₂ content.