Relationships between Different Preparations of Cotton Hollow Yarn and Water Soluble PVA Extraction

IntroductionCotton hollow yarn is one of novel products . Thespinning technique is to reduce the fiber packing density inthe center of the yarn, and to i mprove the softness andbulkiness of the conventional yarn and its products . To getcotton hollow yarns , water soluble PVA filament[1]orstaple fiber is used as the core which will be removedlater ,and cotton fibers as sheath wrapping on the core .The outstanding properties[2]of cotton hollow yarnproducts are that they promote a lighter weig…     

应用聚L-色氨酸/石墨烯修饰电极同时测定尿酸和黄嘌呤

将玻碳电极(GCE)放入含有L-色氨酸(TR)和氧化石墨烯(GO)底液进行循环扫描聚合,得到聚L-色氨酸(PTR)和电化学还原石墨烯(ERGO),从而制备了PTR-ERGO/GCE,电极具有较快的电子传递速率和较好的催化能力。利用循环伏安法(CV)和差分脉冲伏安法(DPV)探究尿酸(UA)和黄嘌呤(Xa)在该电极上的电化学行为。UA和Xa在电极表面的氧化过程均受吸附和扩散共同控制,以扩散为主。在最佳条件下,UA在0.626 V处产生一个氧化峰,Xa在0.994 V处产生一个氧化峰,两峰分开0.368 V,不需分离,即可同时进行测定。采用DPV法同时测定UA和Xa的线性范围分别为5.0×10-8~2.0×10-4mol/L和1.0×10-7~2.0×10-4mol/L,检出限分别为10和30 nmol/L。方法已用于人体尿样中尿酸和黄嘌呤的同时测定。     

Absorption and Permeability of Air-jet Textured Glass Fiber Yarn and Its Fabric for Resin

The Absorption and permeability of air-jet textured glass fiber yarn and its fabric and bonded tenacity of the fabric have been studied in relation to the main parameters, air supplied pressure and overfeed ratio. It has been observed that increasing the level of main parameters improves the coated ratio of the textured yarn and its fabric as well as the bonded tenacity of the fabric made of textured yarn. Comparison of absorption or permeability between textured and supplied yarns, and comparison of absorption or permeability and bonded tenacity between the two kinds of fabrics have been elucidated.