Effect of Elastane on Physical Properties of 1×1 Knit Rib Fabrics

Because of wearing and washing the knit rib fabrics are highly vulnerable to lose their dimensional stability. The work investigated the physical properties of 1×1 knit rib fabrics with or without elastane. The fabrics made from 100% cotton yarn were compared with the fabrics made from cotton/elastane(95%/5%) blended yarns by Lisky circular knitting machine. Pilling, shrinkage, spirality, and bursting strength were tested by the ICI pilling test box, Wascator, and TruBurst machine to demonstrate the effect of elastane on fabric properties. Experimental results showed that elastane has a noteworthy impact on the physical properties of 1×1 knit rib fabrics which can make the fabrics more durable and dimensionally stable in practice.     

Similarity Measurement of Web Sessions Based on Sequence Alignment

The task of clustering Web sessions is to group Web sessions based on similarity and consists of maximizing the intra-group similarity while minimizing the inter-group similarity. The first and foremost question needed to be considered in clustering Web sessions is how to measure the similarity between Web sessions. However, there are many shortcomings in traditional measurements. This paper introduces a new method for measuring similarities between Web pages that takes into account not only the URL but also the viewing time of the visited Web page. Then we give a new method to measure the similarity of Web sessions using sequence alignment and the similarity of Web page access in detail Experiments have proved that our method is valid and efficient.     

Effects of Heat Treatment on Properties of Polyester Filaments

Many properties of polyester filaments such as heat shrinkage, tenacity, elongation at break and etc. are greatly influenced by drawing, so post-drawing is important in downstream processing. As more and more profile fibers and multi-variance fibers used in textile industry, the properties of above two kinds of differential polyester filaments after drawing in different heat conditions were studied. Finally following conclusions were obtained: Firstly, the tenacity and elongation at break decreases with the rise of Tp. Secondly, the tenacity rises but the elongation at break decreases with the increase of Tb. Then, when the Tb is low, both the shrinkage in boiling water and hi hot air decreases with the rise of Tp, while, when the Tb is high, both the shrinkage rises with the rise of Tp. The last, both the shrinkage decreases with the rise of Tb.     

Influence of Spinning Variable on the FR Properties of Yarns

Broadly considered, spuming variables influences the properties of yarns. However there is scant information on the influence on the fire retardancy (FR) properties. The present work aims to establish the influence of the spinning method, twist, and fibre distribution in a blended yarn, on the FR properties of the yarn.     

Study on Properties of Dynamic Heat-Moisture Transfer of Summer Fabrics

The skin heat loss(heat flow)of summer fabrics duringthe course of sweating--evaporating--drying is mea-sured by an apparatus specially made for the purpose.Itis pointed out that:the dynamic heat-moisture comfortcan be described by evaporating rate or time required fordrying out of a certain amount of sweat.The evaporat-ing rate is influenced by the hygroscopic property andthickness of the fabric,the larger the hygroscopicity ofthe fabric with the same thickness,the smaller the evap-orating rate of the perspirated sweat.     

Effect of Chemical Structure on Molecular Properties of Hyperbranched Polycarbosilanes

1 Results In spite of the increased interest to the synthesis of hyperbranched polymers,there is a lack of studies of conformational properties of their macromolecules.Structural features of hyperbranched polymers are responsible for new properties that distinguish them from linear compounds and open unique possibilities for their applications.The knowledge of the "structure-properties" relationships is of fundamental value,it also can be helpful when developing new technologies and new materials. The goal of the work is to study hydrodynamic and molecular properties of hyperbranched polymers depending on their molar mass (MM) and on the linear chain length between the branching points of macromolecules.     

The Effect of Strain Rate on Tensile Properties of Cotton Yarns

The effect of strain rate on tensile properties of cotton yarns is analyzed using the standard linear solid model. The tensile curve, breaking strength and work of rupture of the yarns under different strain rate are calculated. A good correlation exists between the experiment results and theoretical anticipations.     

Study on Preparation and Properties of Zinc Alginate Fiber

Zinc alginate fiber was prepared via the self-made wet-spinning mechanism.The energy spectrum showed the fiber contained lots of zinc ion.The surface morphology of fiber was analyzed the by SEM and crystal orientation was showed clearly in the axial.Single fiber tensile test indicated the average tensile strength of 20.36cN/tex and line density of 2.79dtex.     

Numerical Simulations on Geometrical Properties of Wall-attaching Transonic Jet

Effects of operating conditions and device＇ s geometrical sizes on geometrical properties of wall-attaching transonic jet between two parallel plat plates are numerically simulated. Conclusions are as follows ： 1 ） Upriver part of the wall-attaching jet＇s center streamline is in good accordance with parabola; 2） When both gas inlet pressure and outlet pressure as well as their ratio are not too high （ the outlet pressure is less than 10 MPa and the pressure ratio is less than 3 ）, the center streamlines of the wall-attaching jet with the same pressure ratio coincide with each other very well, and the deflection degree of the center streamline decreases with rise of the pressure ratio ; 3 ） The deflection degree of the jet＇ s center streamline decreases with either broadening of nozzle＇ s throat or rise of wall offset ; 4） With rise of the pressure ratio, attachment distance of the jet increases, but the increase rate descends ; 5 ） The attachment distance ascends with rise of either the nozzle＇ s throat or the wall offset.     

Effect of Heat Treatment on Structure and Properties of WC-Co Hardmetals

Heat treatment changes the structure of the cobalt binder phase and the properties of the WC-Co hardmetals. The higher the cobalt content in the alloy is, the more effective the heat treatment is. The present work has found that the transformation of α-Co to ε-Co can be depressed by quenching the specimens in oil from 1000℃ and hence the transverse rupture strength of these specimens can be increased. During tempering the quenched specimens, new precipitated phases which have dispersion hardening effect on the cobalt binder phase have been observed.     

Research on the Properties of the Naturally Coloured Cottons

IntroductionTextile is among the industries in which harmfulsubstances would arise. The disposal of the drainage afterdyeing and finishing causes environmental pollution. Onthe other hand, questions are frequently raised regardingtextile fibres and their impact on the environment,workplace and their product safety, it is reported thatfabrics made by using synthetic fibres would cause healthhazards to the users[1].Cotton, here means the white cotton,…     

Study on Technology and Properties of Brush Plating Coatings

A new brush plating process with a soluble anode of nickel was introduced. TDY112 brush plating solution was used on the No. 20 carbon steel substrate. It has the higher deposit velocity, better properties and lower cost. Scanning electronic microscopy(SEM), optical microscope, microhardness testand wear test were adopted to detect the surface quality and the properties of the coating, such has micrograph, microstructure, micro-hardness wear resistance and adherence between the coating and the substrate. The experimental results showed that the suitable technological parameters to be used, the coatings had better the surface quality, higher hardness and wear resistance.     

Properties of Surface Cyclic Oligomers Present on Polyester Fiber

The effects of different treatments, such as dry heat,wet heat, solvent vapor and ultrasonic, on propertiesof the cyclic oligomers on the surface of polyester fiberare studied. The components of surface oligomers areanalyzed through Thin-Layer Chromatograph. Theresult shows that: all of the treatment, especially     

Electronic Properties of Organic Semiconductors Based on Nonconjugated Polymers

1 Results The paper presented review of experimental results on the charge transport study in the polymer materials,possessed charge instability.The base of these materials is noncojugated polyaromatic compounds.Characteristic feature these materials is a wide of band gap up to 4.3 eV and the value of first ionization potential about 6 eV.Electronic energetic parameters like these are typical for insulator materials.However it was established that there are not only hopping mechanism of charge transport possible but coherent too in such organic systems.Wide band gap organic material capable to transport charge carrier effectively under certain conditions and the same time conductivity can reach 105 (Ohm·cm)-1 value and current density up to 106 A/cm2 and more.Transformation to conducting phase may occur with different fields and influences,such as electric field,magnet field,pressure,temperature and others.These transformations are reversible as a rule.There is three main of the phenomena fields may be emphasize: electro-optical,switching,and electronic phenomena,including nanophenomena.Electro-optical phenomena are electroluminescence first of all[1].Switching phenomena unites as following switching induced by electric field[2],pressure[3],magnet field[4],boundary condition changing[5],traps thermoionization[6],particle irradiation[7].Electronic phenomena which can observe in thin polyarylide films are as follow electron cold emission[8],superconductivity[9],charged induced nanomemory[10],quantum dot generation[11].     

Properties of Fuzzy Entropy Based on the Shape Change of Membership Function

Modification of a fuzzy partition often leads to the change of fuzziness of a fuzzy system. Researches on the change of fuzzy entropy of a fuzzy set, responding to shape alteration of membership function, therefore, play a significant role in analysis of the change of fuzziness of a fuzzy system because a fuzzy partition consists of a set of fuzzy sets which satisfy some special constraints. This paper has shown several results about entropy changes of a fuzzy set. First, the entropies of two same type of fuzzy sets have a constant proportional relationship which depends on the ratio of the sizes of their support intervals. Second, as for Triangular Fuzzy Numbers （TFNs）, the entropies of any two TFNs which can not be always the same type, also, have a constant proportional relationship which depends on the ratio of the sizes of their support intervals. Hence, any two TFNs with the same sizes of support intervals have the same entropies. Third, concerning two Triangular Fuzzy Sets （TFSs） with same sizes of support intervals and different heights, the relationship of their entropies lies on their height. Finally, we point it out a mistake that Chen＇s assertion that the entropy of resultant fuzzy set of elevation operation is directly to that of the original one while elevation factor just acts as a propartional factor. These results should contribute to the analysis and design of a fuzzy system.     

Evolutionary Random Sequence Generators Based on LFSR

0 Introduction With the development of cryptography, the need for random numbers of high quality is sharply growing. Pub- lic/private keypairs for asymmetric algorithms are gener- ated from random bit streams[1,2]; random numbers are also used for key gen…     

Effects of Electrochemical Treatment on the Superficial Properties of Rayon-based Carbon Fibers

The development of surface acidity on rayon-based carbon fibers during mild electrochemical treatment was investigated. Conductimetric titration was the primary method used to investigate the functionalities on the carbon fiber surface. The acidity on the surface of the untreated carbon fiber was very low, while for the treated fibers, the acidity increased significantly. Moreover, with the treatment extent proceeded, the acidity on the fiber surface also increased. SEM analysis shows electrochemical treatment under intense treatment degree caused considerable etch on the fiber surface. Cavities and grooves can be observed on the surface via the SEM microphotograph. While in a more mild treatment, electrochemical treatment didn't cause great etch on the surface of the fiber.     

Effect of Electrospark Alloying Process on Microstructure and Properties of the coating

Using electrospark alloying machine, a series of experiments were carried out to investigate the effect of electrospark surface strengthening process on the microstructure and the properties of the coatings with ultrafine cemented carbide as electrode material and white cast iron as substrate material. The results indicated that the optimum process parameters to be used reached a satisfying coating surface. Wear test results showed the coatings had a high wear-resistance.     

Investigation on the Dimensional Properties of Relaxed Plain Knitted Fabrics

A geometric model of relaxed plain-nitted fabric isproposed.A method based on the model for predictingthe loop length from the course spacing,wale spacing offabric and the diameter of yarn is deduced,as well as a computer program is developed to graphically represent the structures of plain knitted fabric with various struc-tural parameters.     

Some Properties of Generalized Solutions of a Nonlinear Diffusion Equation in Hydrology

§ 1 Introduction In this paper we consider Cauchy problem of the nonlinear partial differentialequation(1.1) u_t=(u(1-u)u_x/(1+u_x~2)_x Q_T=(-∞,∞)×(0,T)(1.2) u(x,0)=u_0(x) x∈(-∞,∞)where u_0(x) satisfies the hypotheses(1.3) u_0∈c′(R), 0≤u_0(x)≤1,-1≤u_0~′(x)≤1