基于辐热积模型的温室栽培生产规划决策支持系统磁

为实现定期上市目标下的温室栽培生产规划,以作物辐热积模型为依据,利用历史气象数据和市场价格信息,建立基于辐热积模型的温室黄瓜栽培生产规划决策模型。应用 Web 技术开发了温室作物栽培生产规划决策系统,系统能实现作物在确定种植时间条件下预计上市期及温室运行过程的逐日环境优化决策,并以温室栽培黄瓜为例,对决策模型进行了验证。结果表明,系统能根据用户所提出的决策目标和温室运行状况,实现温室栽培生产的规划决策。     

基于ERP的电力物资平衡利库系统

为贯彻电力物资精益化管理要求,加快构建储备合理、周转高效的物资仓储管理体系,实现物资需求计划与现有库存物资的有效匹配,不断提高仓储管理水平,提升库存资源利用效率,提出基于ERP实现电力物资平衡利库系统。通过介绍平衡利库的业务理念、应用策略,以及基于ERP对平衡利库系统的最终实现,为提升物资精益化管理水平打下坚实的基础。     

闪火条件下防火服装热收缩形变的数据挖掘

随着暖体假人、燃烧假人、三维扫描仪等服装设备的应用,服装工程的大样本实验产生了大量数据,采用传统的数据分析方法未能发挥实验中大样本量的优势。本研究利用 Clementine 软件,选取了合适的分析方法,对防火服装的形变等有关数据进行了数据挖掘的尝试。首先通过变量重要性分析,研究了热收缩的重要影响因素,然后根据决策树与神经网络的变量重要性排序,提取了影响热收缩的关键因素,并进一步通过对热收缩及关键影响因素的聚类分析,探索了防火服不同部位区域的热防护特点。研究发现,热流量及衣下空气层是影响热收缩形变的关键因素,手臂及腿部对应服装部位需重点防护,数据挖掘技术是探索服装舒适性与功能机制与特点的有效工具。     

一种可降解PBAT复合材料相容剂的合成及应用

以扩链剂ADR4370S 和硅烷偶联剂KH550为原料，合成了一种含硅相容剂（K-ADR）并应用于滑石增强PBAT基复合材料中。采用FTIR、1HNMR、TGA对K-ADR的结构进行了表征，通过转矩流变仪制备PBAT/K-ADR/滑石体系复合材料，并对复合材料的流变性能、力学性能、冲击断面微观形貌和元素分布进行了表征。结果表明，当相容剂K-ADR添加质量是体系质量的6‰时，PBAT/K-ADR/滑石复合材料拉伸强度、冲击强度和弯曲模量分别为19.11MPa、67.68KJ/m2和378.36MPa，相比于纯PBAT样品分别提高了5.3%、110.7%和346.7%。复合薄膜的水蒸气透过率系数（WVP）为5.70×10-12g·cm/cm2·s，氧气透过率系数（OP）为3.17×10-13cm3·cm/(cm2·s·Pa)，分别降低为纯PBAT样品的2.1％和1.0％。     

Modification of zeolite surfaces by Grignard reagent

New microporous hybrid organic/inorganic materials were obtained by modification of zeolites using chlorination of their surface, followed by treatment with a Grignard reagent. Loading of butyl groups and retained crystallinity of ZSM-5 type zeolites was higher than for zeolites Y. In contrast to zeolites Y, the lattice parameters of zeolites ZSM-5 increased after surface modification. The obtained hybrid materials on the basis of high-silica zeolites possess a high degree of crystallinity at increased hydrophobicity.     

Synthesis,characterization, and thermal behavior study of methyl methacrylate polymers containing 4‐carbazole substitutes

A new polymerizable monomer, [4‐(9‐ethyl)carbazolyl]methyl methacrylate ( 2 ), was synthesized by reacting of methacrylic acid and 4‐hydroxymethyl‐9‐ethyl carbazole ( 1 ) by esterification procedure in the presence of N,N′‐dicyclohexylcarbodiimide. The resulting monomer was then polymerized free‐radically to form the poly(methyl methacrylate) containing 4‐(9‐ethyl)carbazolyl pend ent groups. Also, copolymerization of monomer 2 with various acrylic monomers such as methyl methacrylate, ethyl methacrylate, methyl acrylate, ethyl acrylate, and n‐butyl acrylate by azobisisobutyronitrile as a free radical polymerization initiator gave the related copolymers in high yields. The structure of all the resulted compounds was characterized and confirmed by FTIR and ¹H NMR spectroscopic techniques. The average molecular weight of the obtained polymers was determined by gel permeation chromatography using tetrahydrofurane as the solvent. The thermal gravimetric analysis and differential scanning calorimeter instruments were used for studying of thermal properties of polymers. It was found that, with the incorporation of bulky 4‐(9‐ethyl)carbazolyl substitutes in side chains of methyl methacrylate polymers, thermal stability and glass transition temperature of polymers are increased. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4989–4995, 2006     

A novel synthesis method for the preparation of aromatic poly(imide benzoxazole) from trimellitic anhydride chloride and bis(o‐aminophenol)

A poly(imide benzoxazole) was prepared directly from trimellitic anhydride chloride and 2,2‐bis(3‐amino‐4‐hydroxyphenyl)hexafluoropropane (BisAPAF) monomers in a two‐step method. In the first step, a poly(hydroxyamide amic acid) precursor was synthesized by the low‐temperature solution polymerization in an organic solvent. Subsequently, thermal cyclodehydration of the poly(hydroxyamide amic acid) precursor at 350°C produced the corresponding poly(imide benzoxazole). The inherent viscosity of the precursor polymer was 0.22 dL/g. The cyclized poly(imide benzoxazole) showed a glass transition temperature (T_g) at 329°C and a 5% weight loss temperature at 530°C in nitrogen and at 525°C in air. The poly(imide benzoxazole) is amorphous as evidenced by the wide‐angle X‐ray diffraction measurement. The structures of the precursor polymer and the fully cyclized polymer were characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance spectroscopy (¹H NMR). © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2388–2391, 2003     

工业控制系统中可靠性设计的研究

本文主要阐述了在工业生产控制系统中,可靠性设计中的热设计、电磁防护设计、机械防震设计,提出了可靠性设计中应当注意的问题,以及一些解决问题的方案和办法.热设计中应当主要注意温度,电磁防护设计中应当主要注意屏蔽和接地,机械防震设计中应当主要注意防震.     

5-氰基-4-氨基咪唑的合成与热性能

咪唑基含能化合物是目前高能化合物的重要研究方向，而5-氰基-4-氨基咪唑是设计、合成新型咪唑联四唑类高能高氮化合物的关键中间体。以5-甲酰胺基-4-氨基咪唑（AICON）为原料，经其与三氯氧磷（POCl3）的脱水反应获得了5-氰基-4-氨基咪唑（AICN），通过优化反应体系、反应温度、反应时间以及物料物质的量比，使得AICN的收率>65%，纯度（HPLC）>99.5%。此外，采用NMR、IR和元素分析对其进行了结构确征，利用热重分析法研究其热性能。结果表明：AICN的最佳反应条件为以POCl3为脱水剂，n(AICON)：n(POCl3)为1:10，反应升温模式为先快速升温至80~85 ℃，维持反应30 min，然后降温至70~75 ℃，维持反应1~1.5 h；AICN在40~1000 ℃温度区间存在两个失重过程，对应的热分解温度区间分别为40~400 ℃和400~1000 ℃、热失重分别为19.8%和60.7%、热分解峰温分别为256.5和698.4 ℃，表明其具有良好的热稳定性。     

Structural and Mechanical Properties Changes of Ethylene‐α‐olefin Copolymer Blends Induced by Thermal Treatments and Composition

Summary: Blends of single‐site catalysed ethylene‐α‐butene (C₄VLDPE) and ethylene‐α‐octene (C₈VLDPE) copolymers were prepared by melt extrusion. The phase morphology, thermal and mechanical properties of the blends have been investigated by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), tensile test and dynamic mechanical analysis (DMA). Depending on the composition and thermal history, significant differences in structure and behaviour were found. It was also found that some degree of co‐crystallization occurred for quenched blends; whereas most of the oven slowly cooled blends showed two well‐defined melting peaks, indicating that the slow cooling favoured partial segregation of the fractions with different degrees of branching to form two morphologies. Moreover, SEM revealed morphology of the thinner crystals distributed in‐between the thicker sheaf‐like crystals for the slowly cooled blends with 20–50% C₈VLDPE. Therefore, the synergism in mechanical properties for the blends with 20–50% C₈VLDPE is due to a combination of larger crystal size, more complete phase separation and interfacial interaction produced by the segregation effect of the slow cooling treatment. DMA studies showed that the storage modulus increased as the addition of C₈VLDPE and modulus for the slowly cooled blends are about twice those measured for the quenched ones, indicating higher stiffness of the blends. The smooth shift of β relaxation temperature with addition of C₈VLDPE for both sets of blends confirmed the miscibility in the amorphous phase.

SEM image of the C₄VLDPE‐C₈VLDPE (50/50) blend after oven slow cooling treatment.