涤纶织物碱胺同浴改性前热定形条件选择

从减量率、结晶度、回潮率、酸性染料上染性能及断裂强度等方面考察热定形条件的温度、时间、张力对涤纶织物碱胺同浴改性效果的影响,以确定合理的热定形条件。     

老年高血压合并冠心病患者的心率变异性分析

目的了解老年高血压(EH)病合并冠心病(CHD)患者心率变异性的特点及其临床意义。方法选择EH患者34例及EH合并CHD患者32例,老年健康对照组38例,青年健康对照组51例,进行24h动态血压和动态心电图检查,对两组患者心率变异性(HRV)参数及室性心律失常发生率进行对照分析。结果与对照组比较,EH组和EH合并CHD组HRV均降低(P<0.05),其中EH合并CHD组HRV降低更为显著(P<0.01);与对照组比较,EH组和EH合并CHD组室性心律失常的发生率增加(P<0.05),其中EH合并CHD组室性心律失常的发生率增加更为显著(P<0.01)。结论反映自主神经活性变化的HRV可作为高血压患者预后的重要指标之一。尤其对EH合并CHD的患者,临床上除降压治疗外,还应根据HRV的改变情况给予积极改善自主神经功能的治疗。     

螺旋藻-黄秋葵饲料添加剂对南美白对虾生长发育的影响

向南美白对虾的基础饵料中添加螺旋藻-黄秋葵精粉,研究其对南美白对虾的促生长效能。结果表明:4%的添加量对提高南美白对虾生长性能的效果最佳,此时成、幼虾体增重率分别为32.19%和103.73%,相比对照组提高了22.72%和46.76%,螺旋藻-黄秋葵复合饲料添加剂更有利于提高幼虾的生长性能。此外,螺旋藻-黄秋葵精粉对南美白对虾个体成活率也有不同程度的提高。     

Effect of Ozone on Viability of Activated Sludge Detected by Oxygen Uptake Rate (OUR) and Adenosine-5′-triphosphate (ATP) Measurement

The current study focused on treatment of phenolic wastewater using an integrated process – dosing of ozone directly to activated sludge. The main goal was to analyze the effect of ozonation on viability of activated sludge in different systems – activated sludge in distilled water and activated sludge in wastewater. Two viability detection methods, oxygen uptake (OUR) rate and adenosine-5'-triphosphate measurement (ATP), were compared. The linear correlation between ATP and OUR measurements in studied range was found to be good (r² = 0.90). In case of ozonation of activated sludge in wastewater, ozone doses up to 42 mgO₃·gMLVSS^?1 did not influence the viability of sludge. In addition, contrary to ozonation of sludge in distilled water, soluble COD was reduced by 15.6% (at ozone dose of 42 mgO₃·gMLVSS^?1).     

The preparation of conductive nano-LiFePO4/PAS and its electrochemical performance

A simple and effective method has been developed to synthesize a nano-sized LiFePO₄/PAS (polyacenic semiconductor) composite. The LiFePO₄ particles coated and connected by PAS are uniformly distributed in the range of 50-80 nm. The electronic conductivity of this material is as high as 1.2 × 10⁻¹ S/cm due to the conductive network of PAS. In comparison with the micro-LiFePO₄/PAS, the nano-LiFePO₄/PAS exhibits much better rate performance. At the 12-min charge-discharge rate, the power and energy densities of the nano-LiFePO₄/PAS are shown as 2063 W/kg and 412 Wh/kg, which are much higher than those of the micro-LiFePO₄/PAS (1600 W/kg and 320 Wh/kg). It is especially notable that the nano-LiFePO₄/PAS cathode without adding Super P shows similar electrochemical behaviors with the cathode adding Super P at all C-rates. Thus, such cathode without adding Super P will enlarge both the volume energy density and weight energy density of batteries. In addition, this cathode exhibits an excellent long-term cyclability, retaining over 95.4% of its original discharge capacity beyond 500 cycles at 0.2C rate. These favorable electrochemical performances should be attributed to its nanometric particle size and the high electronic conductivity.     

Preparation and electrochemical performance of Li4Ti5O12/carbon/carbon nano-tubes for lithium ion battery

A Li₄Ti₅O₁₂/carbon/carbon nano-tubes (Li₄Ti₅O₁₂/C/CNTs) composite was synthesized by using a solid-state method. For comparison, a Li₄Ti₅O₁₂/carbon (Li₄Ti₅O₁₂/C) composite and a pristine Li₄Ti₅O₁₂ were also synthesized in the present study. The microstructure and morphology of the prepared samples are characterized by XRD and SEM. Electrochemical properties of the samples are evaluated by using galvanostatic discharge/charge tests and AC impedance spectroscopy. The results reveal that the Li₄Ti₅O₁₂/C/CNTs composite exhibits the best rate capability and cycling stability among the samples of Li₄Ti₅O₁₂, Li₄Ti₅O₁₂/C and Li₄Ti₅O₁₂/C/CNTs. At the charge-discharge rate of 0.5 C, 5.0 C and 10.0 C, its discharge capacities were 163 mAh/g, 148 mAh/g and 143 mAh/g, respectively. After 100 cycles at 5.0 C, it remained at 146 mAh/g.     

牡蛎肽肠内营养制剂对小鼠肠道功能作用的研究

本文主要探讨牡蛎肽肠内营养制剂对小鼠肠道功能的作用。将动物随机分为阴性对照组、阳性对照组和低、中、高剂量组5组,灌胃给予不同剂量牡蛎肽肠内营养制剂,每天测定各组体重和进食量,最后测定食物利用系数、小肠推进率、小肠吸收等评价指标。结果显示,与阴性对照组相比,低、中剂量组食物利用系数和小肠推进率均有明显增加,低剂量组木糖浓度明显增高。可见,牡蛎肽肠内营养制剂能促进小肠推进和消化吸收,可以作为肠内营养制剂应用于临床营养支持。     

PTT含量与棉混纺织物性能的关系

探讨PTT含量对棉混纺织物性能的影响。测试了不同PTT含量下高含棉织物的水洗抗皱等级、定伸长和定负荷下的残余伸长率和弹性回复率、撕裂强力、拉伸强力,并与涤棉织物、棉XLA包芯织物的相应性能进行比较。结果发现,采用低于20%的PTT/PET双组分短纤,可有效提高含棉织物弹性伸长和回复性能,且织物残余伸长率较小,织物的撕裂强力和拉伸断裂强力优良,其抗皱等级得到一定程度提高。     

阻燃抗熔融粘胶纤维的纺纱实践

为开发出具有阻燃效果的纺织品,针对阻燃抗熔融粘胶纤维具有阻燃、隔热和抗熔滴的性能,通过开清棉工序提高纤维转移率,梳棉工序合理配置各部隔距,并条工序提高纤维平行伸直度,粗纱工序防止意外牵伸,细纱工序采用重加压、较小后区牵伸、较大后区隔距、小钳口的工艺配置,并严格控制各工序温湿度,使所纺制的阻燃抗熔融粘胶纤维14.8tex纯纺纱得以顺利生产。     

纱线细度对竹炭织物保健功能的影响

探讨两种纱线细度及竹炭纬纱密度变化对织物保健功能指标的影响。通过测试7种细号纱织物和7种粗号纱织物的保暖率、传热系数、透气量、负离子发生数、苯吸附率,对织物结构参数与保健功能指标进行了相关分析,并对其相关系数进行了配对分析。研究发现,纱线细度的变化能明显改变织物的保暖率、传热系数、透气性、负离子发生数、苯吸附率;纱线细度变化而引起的织物结构参数变化对保暖率、透气量、负离子发生数的相关性影响不大,而对传热系数、苯吸附率的相关性影响较大。