并行企业运作--基于并行工程的过程企业管理

针对过程企业,基于并行工程的思想,提出了过程企业运作管理的新思想--并行企业运作,并采用IDEFO(ICAM Defintion)功能建模方法,建立了集成并行的业务过程模型,在每个业务过程内部采用"监控-决策-执行"的实时信息反馈系统,以实现企业各业务过程之间的信息交互与资源共享.     

吡氟禾草灵的合成

以对苯二酚、2-氯-5-三氟甲基吡啶为原料通过先醚化得到4-（5-（三氟甲基）吡啶-2-苯氧基）苯酚，再与R-甲磺酰乳酸丁酯进行醚化反应得到吡氟禾草灵，所得产物化学结构经核磁共振谱、质谱等确证。反应总收率在42．0％以上，含量（HPLC）达93．0％。     

用六水氯化钙作为相变材料的换热器储热性能研究

研究了一种以传统的管壳式换热器作为结构基础、管内充填相变材料——六水氯化钙的新型相变材料换热器的储热性能。对这种新型相变材料换热器分别通入温度不同的冷热流体，利用温度测试系统对其进口、出口的温度进行了测试。实验结果表明，这种相变材料换热器结构能将温度较高的热流体的热能通过其管内充填的相变材料储存起来，必要时又可以将储存的热能释放给所需的流体中，从而使其既具有热量交换的功能又具有热量储存的功能。它主要适用于温室、暖房、工业生产中的低品位热能的回收和利用，还可以应用于热能供应与人们需求之间不一致的场合，如太阳能热利用、采暖和空调领域等。     

聚(L-谷氨酸-γ-苯甲酯)接枝共聚物的合成

以溶液聚合直接合成聚丙烯酸,通过接枝反应将疏水的聚肽链接到聚丙烯酸亲水链段上形成两亲性共聚物,合成了新型聚肽接枝共聚物。用核磁共振等方法表征了接枝共聚物的存在。实验结果表明其在含有钠离子的水溶液中能自行组装成为高聚物纳米胶束。     

聚乙二醇-400催化合成橙花醚的研究

研究了利用多种相转移催化剂在不同条件下合成橙花醚。结果表明：采用聚乙二醇 ４００（ＰＥＧ ４００）为催化剂，当β 萘酚：溴乙烷：催化剂＝１：１２：００７（摩尔比）、温度为７６℃、反应７ｈ时，产率可高达９８１％。     

Proposed Phenomenological PTCR Model and Accompanying Phenomenological PTCR Chart

The positive temperature coefficient of resistivity (PTCR) behavior of semiconductive BaTiO₃ is well explained by the Heywang model, which predicts the resistivity behavior above the Curie point based on the acceptor state density at the grain boundaries, the charge carrier density, and the energy gap, E _s, between the conduction band and the acceptor levels. However, the relationship between these parameters and the production parameters (sintering time, composition, and cooling rate) is not well understood. Recently, the present authors have found that E _s can be increased by thorough oxidation. This increase is attributed to a change in the oxidation state of the acceptor. Based on this finding and results from the literature, a phenomenological PTCR model and an accompanying PTCR chart for acceptor–donor-codoped BaTiO₃ are proposed to clarify this relationship. The PTCR chart clarifies that acceptor dopant concentrations, oxidation time, and oxygen partial pressure during oxidation or cooling can be optimized simultaneously to obtain optical PTCR properties.     

Experimental Evaluation of the Acceptor-States Compensation in Positive-Temperature-Coefficient-Type Barium Titanate

Experimental evidence shows that the acceptor-state levels in Sb-doped positive-temperature-coefficient-type BaTiO₃ are compensated up to a critical acceptor-state density. Using the slope of the natural logarithm of the resistivity with respect to 1/ T , instead of maximum resistivity as a measure for the acceptor-state density, it is possible to estimate this critical value. The value obtained (4.2 × 10¹⁷ m⁻²) is believed to be the first reported estimate based on experimental data. It is in good agreement with the estimate of 6 × 10¹⁷ m⁻² (first reported by Jonker) obtained from the spontaneous polarization of BaTiO₃. This shows that the ferroelectric behavior of BaTiO₃ is indeed a feasible explanation for the low resistivity below the Curie point, as proposed by Jonker.     

Water flux,DSC, and cytotoxicity characterization of membranes of cellulose acetate produced from sugar cane bagasse,using PEG 600

Summary In this article, cellulose acetate produced through the homogeneous acetylation of sugar cane bagasse cellulose was used to produce membranes, using poly(ethyleneglycol) 600 (PEG 600) as an admixture. The membranes were characterized using water flux measurements (Payne’s cup), differential scanning calorimetry (DSC) and neutral red uptake (cytotoxicity). The results showed that PEG 600 acts as a crystallinity inductor and/or pore former in the cellulose acetate matrix. The induction of crystallinity is important for this system since it had not been reported on the literature yet. The results also demonstrated that the studied membranes present a nontoxic behavior.     

Marvelous self-assembly of hierarchically nanostructured porous zirconium phosphate solid acids with high thermal stability

A hierarchical structure of thermally stable macroporous zirconium phosphate solid acids with supermicroporous walls was prepared by a simple self-assembly process from the precursors of zirconium propoxide and orthophosphoric acid solution. The macroporous structures are uniform with the diameters ranging from 300 to 800 nm, one-dimensional channel-like. The effect of surfactant Brij 56 on the formation of macroporous structures has been studied. The frameworks of the synthesized hierarchical zirconium phosphates are amorphous with Zr–O–P bonding, exhibiting remarkably high thermal stability (at least 800 °C), on the basis of the X-ray diffraction (XRD), N₂ adsorption, X-ray photoelectron spectroscopy (XPS) analysis, Fourier transform infrared (FT-IR) and ³¹P nuclear magnetic resonance (NMR) spectra. Larger quantities of Zr–OH and P–OH groups are observed besides surface hydroxyl groups, suggesting the presence of acidity and the possibility of surface functionalization for practical applications including catalysis. The macroporous zirconium phosphates with hierarchical structures could also be the potential and efficient catalyst supports for the design of the structured catalysts and reactors.