聚砜中空纤维膜乙炔脱湿的研究

采用渗透侧抽真空的方式对膜法乙炔脱湿进行了系统的研究.考察了不同处理量下,渗透侧真空度对渗余气含水量、回收率、分离因子和水蒸气、乙炔渗透通量的影响.当处理量为2.4 mL/s,原料气压力为180 kPa,渗透侧压力为20 kPa时,经过膜分离器处理后的乙炔水含量可由1%降至0.4%以下,渗透气量小于5%,便于循环利用.     

生态型木纤维吸油材料的制备与研究

以杉木为原料,经蒸煮、纤维帚化疏解、热解处理制备出生态型木纤维吸油材料.研究了吸油材料的吸油性能及其与热处理温度、抽出物的关系等问题.结果表明,经过350℃热处理试样的吸油量最大、吸水量最小,吸油量与吸水量比值高达77.5,是原料用蒸煮纤维的10倍以上.蒸煮纤维在200~500℃热处理时,试样的热水抽出物与1%NaOH抽出物含量随热解温度升高而减少,苯醇抽出物含量则在200~250℃时减少,300℃时增大,400℃后急剧减少.研究表明,纤维表面的亲油性物质对吸油能力有重要影响.     

粒度的分解与复合

文章定义了基于等价关系的粒度的概念,从整体上给出了粒度的分解和合成的统一方法.利用这个方法可以描述和区分信息系统中的元素.     

一种改进的阈值分割算法在复合材料图像处理中的应用

针对纤维增强复合材料微观结构图像的特点,提出了一种改进的基于模糊思想的阈值分割算法,该算法利用整体阈值、局部阈值和像点梯度信息之间的关系,构造了一个双输入单输出的模糊逻辑系统,合理计算出像点的最佳分割阈值.实验结果证明了算法的有效性.     

Effects of Some Additives on the Adhesion of Polyacrylamide Sizes to Fibers

IntroductionPolyacrylamide ( PAM) size is one of the sizeingredients that are commonly used in conventionalfor mulations for warp sizing and paper making .It has theproperties of adhering to fibers and can be capable ofholding fiber together by surface attachment . Comparedwith starches and polyvinyl alcohols , PAM possesses suchcapability as excellent adhesion to cellulose fibers . Thiscapability ,however ,is not due to chemical valence ;but isdeveloped only through hydrogen bonds and Van …     

Research on Flax Fiber Reinforced Polylactide Environmental Friendly Composite

Biodegradable polylactide acid （PLA） resin can be combined with flax fibers to produce biodegradable composite materials. In our study, commercial PLA fibers were mixed with flax fibers by a non-woven method so as to make non- woven pre-forms, which can be generated into flax fiber reinforced PLA environmental friendly composites by heat pressing technology. The tensile, flexural and impact properties are tested in order to evaluate the basic physical properties of the composites, and the influenced factors listed as making technology of the pre-forms, weight ratio of flax fibers and heat pressing technology are discussed and optimized, which can be described as weight ratio of flax fibers and PLA fibers is 50/50, heating temperature, time and pressure are respectively 195℃, 20 rain and 12.5 Mpa. Preliminary results show that mechanical properties of the flax/PLA composites are quite promising compared with flax/PP composites in coclrnon commercial automotive use. Scanning electron microscope （SEM） is used to analyze the tensile specimen fracture surfaces, which shows voids and gaps occurring between flax fibers and PLA matrix and sign of fiber pull.out, the strength of flax/PLA interface can be further improved.     

Liquid Flow in Shaped Fiber Bundle

By computation and comparison of the critical spreading coefficient parameter, it was found that shaped fiber bundle is better for wetting. Liquid-air interface tension of liquid arising the shaped fiber bundle body is considered as one critical factor besides liquid viscosity, inertia force and liquid-fiber interface tension. Experimental result simulation demonstrated that the liquid-air interface tension is correlated with the geometric size of the liquid arising in body, Φ0 （x） and which is affected by the cross sectional shape of fiber and the radius of single fiber. The shaped fiber bundle model is/ntroduced to/nvestigate liquid flow in fiber assembly. The model is generated based on a random function for stochastic forming of fibers in bundle and it is necessary to combine this fundamental model with physical explanation for investigation of liquid flow in fiber assembly.     

复合菌群的构建及其所产MBF絮凝活性的影响因素研究

利用筛选到的MBF产生菌构建出了比单一菌群所产MBF絮凝活性更高的复合菌群—复合2,研究了培养基初始pH值、培养温度、摇床转速、碳源、氮源和接种量等因素对复合2所产MBF絮凝活性的影响。应用实验表明,复合2所产MBF对靛蓝印染废水有较好的去除CODC r和脱色效果。     

医用纺织品的实际应用

介绍了医用纺织品的分类、医用纺织品所使用的新材料及其性能,并指出其替代旧材料的优越性。     

夹芯保温复合墙体及其施工工艺的研究

多年来，建筑墙体一般采用单一材料砌筑，如采用粘土砖、混凝土砌块、加气混凝土等材料，着重考虑其承重功能。但是由于这些密度大的墙体材料的保温性能很差，其导热系数很高，不能满足建筑节能的要求，因此，往往采用承重材料（如砖、砌块等）与高效保温材料[如聚苯板、岩棉板、玻璃棉等]进行复合，这样的墙体即称作复合墙体．发达国家的新建建筑普通采用复合墙体，我国今后建筑要达到节能50％的标准，也必须采用复合墙体。