多组分羊绒混纺针织纱制备及其性能研究

对各系列的多组分低比例羊绒混纺针织纱的强伸性能和捻度进行了测试和分析.结果显示:线密度为20.8tex×2股线、捻度为350 T/m左右的羊绒/羊毛/竹浆纤维三组分混纺纱,线密度为31.3tex×2股线、捻度为350 T/m左右的羊毛/竹浆纤维/PTT纤维三组分混纺纱,以及单纱捻度为650 T/m、股线捻度为400 T/m,线密度为20.8tex×2的羊绒/羊毛/竹浆纤维/PTT纤维四组分混纺纱线性能较好,适合于开发轻薄春秋羊绒衫.     

多组份羊绒混纺针织物物理机械性能的研究

改变羊绒/羊毛/竹浆纤维/PTT纤维混纺织物PTT纤维的含量,测试分析纤维含量的变化对织物物理机械性能的影响.研究表明:随着PTT纤维含量的增加,织物的强力和伸长率先减小后增大,织物的耐磨性能良好,抗起毛起球性能良好.     

模糊评判多组分羊绒混纺织物的服用性能

在测试9种不同混纺比的羊绒/羊毛/竹浆纤维/PTT纤维混纺织物的各项服用性能数据的基础上,用模糊综合评判法在混纺织物的服用性能与混纺比之间建立定量的关系,探讨服用性能最优的混纺比。结果显示,混纺比为7/33/35/25的混纺织物的服用性能在这9种织物中为最佳。     

竹浆/丝光羊毛混纺针织物的热舒适性测试分析

利用三种不同混纺比的纱线,分别织造了针织平针组织和1+1罗纹组织两种不同的织物共6块,并对织物的性能进行测试,最终得出影响竹浆/丝光羊毛纤维混纺织物的热舒适性的主要因素分别是,混纺纱线的混纺比和竹浆/丝光羊毛纤维混纺织物的组织结构。当混纺纱中竹浆纤维的含量比例升高时,竹浆纤维优秀的导热性使织物能有效改善是人体闷热的感觉,同时由于1+1罗纹组织比平针组织结构更加松散,纱线间空隙更多也更有利于湿热空气的排出。     

牛奶蛋白纤维的鉴别及其混纺纱定性定量分析

通过燃烧法、显微镜观察法、着色法、溶解法等相关实验,找出牛奶蛋白纤维与大豆蛋白纤维、新型涤 纶纤维、竹纤维、羊毛纤维和棉纤维的各种形状与性能的不同,从而确定鉴别牛奶蛋白纤维的方法。用该方法对 牛奶纤维/羊毛纤维/棉纤维混纺纱进行定性和定量分析,得出混纺纱的混纺比。     

混纺比对蓄热调温/羊绒混纺纱性能的影响

设计并采用相同的纺纱工艺纺制了5种不同混纺比例的蓄热调温/羊绒混纺纱,研究了不同混纺比对蓄热调温/羊绒混纺纱物理机械性能和调温性能的影响.结果表明:当蓄热调温纤维质量分数大于30%时,混纺纱具有调温性,且随着蓄热调温纤维含量的增加,调温效果逐渐增大,混纺纱的毛羽、条干CV值逐渐下降,而强伸性能呈波动性变化;当蓄热调温纤维质量分数小于50%时,40/60蓄热调温/羊绒混纺纱的强伸性能较好;质量分数大于50%时,混纺纱的强伸性能逐渐增加.     

贴身穿竹毛混纺针织物开发及性能测试

采用80S丝光羊毛纤维和3D毛型竹浆纤维混纺纱,混纺比例竹浆/丝光羊毛分别为30/70、50/50、70/30,进行针织物开发及舒适性探究。通过对混纺纱的强力、伸长率、耐磨性及毛羽进行测试,得出:实验结果均满足上机织造标准。以纬平针组织为例,织造出三种混纺比针织物,并对其透气性、透湿性和热导率进行了测试分析,实验结果表明:织物透气性、热导率随丝光羊毛含量的增加而降低,透湿量随之增加。     

木棉和蚕丝纤维在棉混纺纱中的径向分布规律

蚕丝和木棉纤维都属天然纤维,其与棉纤维进行混纺的产品越来越多。木棉纤维为高度中空结构,在混纺中很容易被压扁;蚕丝是天然纤维,生丝的线密度参差不齐。因此,要想知道木棉和蚕丝在棉混纺纱中的分布,传统方法已不适用。采用Photoshop图像处理技术中的像素法测量混纺纱横截面中各种纤维的面积,使计算木棉和蚕丝纤维的转移指数成为可能。该法还有可能用于快速测试分析木棉/棉混纺比或棉/粘等目前难以测试的混纺比。测试发现：(1)在与棉及棉型粘胶纤维混纺时,木棉纤维向纱表层转移的趋势明显。木棉纤维的汉密尔顿转移指数在20%左右,纱表层木棉纤维所占的百分比远大于纱线混纺比,这是木棉纤维偏短、表面光滑、柔软等性能联合作用的结果;(2)在木棉/粘胶/棉混纺纱中,粘胶纤维向纱芯转移的趋势最强;(3)混纺纱中,木棉纤维有成束现象,纱表层的木棉纤维保持较高的中空度,木棉自身具有回复中空的“潜能”;(4)在棉丝混纺纱中,蚕丝纤维向外转移的趋势明显,纱表层的蚕丝纤维百分率大于纱线混纺比。     

木棉和蚕丝纤维在棉混纺纱中的径向分布规律（英文）

蚕丝和木棉纤维都属天然纤维,其与棉纤维进行混纺的产品越来越多。木棉纤维为高度中空结构,在混纺中很容易被压扁;蚕丝是天然纤维,生丝的线密度参差不齐。因此,要想知道木棉和蚕丝在棉混纺纱中的分布,传统方法已不适用。采用Photoshop图像处理技术中的像素法测量混纺纱横截面中各种纤维的面积,使计算木棉和蚕丝纤维的转移指数成为可能。该法还有可能用于快速测试分析木棉/棉混纺比或棉/粘等目前难以测试的混纺比。测试发现:(1)在与棉及棉型粘胶纤维混纺时,木棉纤维向纱表层转移的趋势明显。木棉纤维的汉密尔顿转移指数在20%左右,纱表层木棉纤维所占的百分比远大于纱线混纺比,这是木棉纤维偏短、表面光滑、柔软等性能联合作用的结果;(2)在木棉/粘胶/棉混纺纱中,粘胶纤维向纱芯转移的趋势最强;(3)混纺纱中,木棉纤维有成束现象,纱表层的木棉纤维保持较高的中空度,木棉自身具有回复中空的"潜能";(4)在棉丝混纺纱中,蚕丝纤维向外转移的趋势明显,纱表层的蚕丝纤维百分率大于纱线混纺比。     

大豆蛋白复合纤维／涤纶混纺纱混纺比的优化分析

通过对大豆蛋白复合纤维／涤纶混纺纱的强伸性、大豆蛋白复合纤维在混纺纱中的分布及混纺纱的抗弯刚度等力学性能的测试分析,采用多目标优化方法确定了大豆蛋白复合纤维／涤纶混纺纱的优化混纺比,优化结果表明,当大豆蛋白复合纤维在大豆蛋白复合纤维／涤纶混纺纱中大豆蛋白复合纤维质量分数达到40％左右时,即为最优混纺比,该混纺比可以保证混纺纱线性能达到最优效果。     

浅析英语语音教学中的/n//l/发音错误

在大学英语教学过程中,有关/n/与/l/的发音错误很常见,原因是没有完全掌握它们的发音规则。/n//l/发音规则的相似性造成了/n//l/不分的情况,而且局部方言中这两个音也不作区分,使得/n//l/混淆的情况更加严重。在教学过程中,可以通过重点讲解区分/n/与/l/的发音规则及其区别来避免/n//l/发音错误。本文同时也分析了含糊/l/音的发音错误,通过对/n/与/l/相关的发音错误分析找出大学英语语音教学行之有效的途径:在完全把握单音的发音规则的基础上,进一步强调语调的掌握,使学生拥有良好的语音。     

肼类燃料液滴的亚临界——超临界蒸发/分解燃烧理论

对肼、一甲基肼、偏二甲肼的亚临界－－超临界蒸发／分解燃烧进行了研究,计算了肼类燃料滴在不同压力下液滴温度和蒸发速度的变化历程,计算了蒸发常数、传热数和传质数,其结果和实验数据是吻合的。本文不但考虑了肼类燃料滴的亚临界蒸发／分解燃烧,还考虑到了其超临界蒸发／分解燃烧,并对达到超临界工况时的界限参数进行了计算。     

Modification of LiCo1/3Ni1/3Mn1/3O2 cathode material by CeO2-coating

LiCo_1/3Ni_1/3Mn_1/3O₂ was coated by a layer of 1.0 wt% CeO₂ via sol-gel method. The bared and coated LiMn_1/3Co_1/3Ni_1/3O₂ was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammogram (CV) and galvanotactic charge-discharge test. The results show that the coating layer has no effect on the crystal structure, only coating on the surface; the 1.0 wt% CeO₂-coated LiCo_1/3Ni_1/3Mn_1/3O₂ exhibits better discharge capacity and cycling performance than the bared LiCo_1/3Ni_1/3Mn_1/3O₂. The discharge capacity of 1.0 wt% CeO₂-coated cathode is 182.5 mAh·g⁻¹ at a current density of 20 mA·g⁻¹, in contrast to 165.8 mAh·g⁻¹of the bared sample. The discharge capacity retention of 1.0 wt% CeO₂-coated sample after 12 cycles reaches 93.2%, in comparison with 86.6% of the bared sample. CV results show that the CeO₂ coating could suppress phase transitions and prevent the surface of cathode material from direct contact with the electrolyte, thus enhance the electrochemical performance of the coated material.     

Transport Properties of Polycrystalline La2/3Ca1/3Mn1-xCuxO3

The infuence of Cu dopant (x) and sintering temperature(Ts) on the troansport propeties of La2/3Ca1/3Mn1-xCuxO3 series samples prepared by Sol-Gel technique was investigated.X-ray diffraction patterns show that all the samples with different Cu dopant and sintering temperatures (Ts) are of single phase without obvious latice distortion.Experimental results indicate that the insulator-metal transition temperature is diectly related to the sintering temperature and Cu dopant x.It is interesting to observe that a proper amount of Cu dompant can substantially improve magnetoresistance effects.     

RDSS/Doppler/GPS/SINS组合导航系统研究

针对双星定位系统(RDSS)存在的定位位置滞后的先天缺陷,根据组合导航定位系统输出速度误差小的特点,给出了一套消除RDSS位置滞后的方案,并对RDSS／SINS组合系统进行了建模,依据联邦滤波器理论,考虑到GPS的实际情况,提出了RDSS／Doppler／GPS／SINS多传感器组合导航系统的设想,仿真结果表明,该组合导航系统具有准确度高、自主性强的特点。     

亚锰酸盐La0.7-xYxCa0.3MnO3的电磁特性和磁电阻效应

研究了用固相反应法制备亚锰酸盐多晶样品La0.7-xYxCa0.3MnO3,并研究了Y的不同掺杂(x=0.1,0.2)对样品的晶体结构、电磁特性和磁电阻效应的影响.实验结果表明,随着温度的降低,x=0.1样品的R-T曲线没有出现峰值,而x=0.2样品出现了峰值,显示了复杂的输运特性.两种样品的磁电阻Rm都随着温度的降低而升高,但都没有出现峰值.x=0.2的样品在较宽的温区内,磁电阻效应都很显著,而且Y掺杂由x=0.1提高至x=0.2,磁电阻效应增强.     

Low temperature properties of organic-inorganic Ag/ p -CuPc/ n -GaAs/Ag photoelectric sensor

A thin organic film of p-type semiconducting copper phthalocynanine (CuPc) was deposited by vacuum evaporation on an n-type GaAs single-crystal semiconductor substrate. The fabricated Ag/p-CuPc/n-GaAs/Ag sensor was carried through an ageing process to stabilize the parameters. Voltage-current characteristics and photoelectrical response of the sensor were investigated at a wide temperature range of 82 to 350 K. Photoelectric characteristics were measured under nonmodulated filament-lamp illumination. It was observed that such sensor parameters as rectification ratio, threshold voltage, junction, shunt and series resistances, open-circuit voltage and short circuit current are temperature-dependent. It was found that wide-range voltage-current characteristics of the sensor may be described similarly to that of a Schottky barrier diode. Using the experimental data on voltage-current characteristics and absorbance of the CuPc films, the energy-band diagram of the p-CuPc/n-GaAs heterojunction was developed. It was shown that data obtained from simulation of an equivalent circuit of photoelectric sensor agreed with experimental results. Supported by the National Engineering and Scientific Commission of Pakistan     

用Cr/Au/Ni/Au制备n-GaN欧姆接触

为了获得n-GaN的低接触电阻的欧姆接触,采用Cr/Au/Ni/Au金属化系统与n—GaN形成欧姆接触,并对其不同温度下的接触电阻率进行了测试分析.室温下Cr/Au/Ni/Au的接触电阻率为0.32mΩ·m2。随着温度的升高,接触电阻率略有增加,在300℃时接触电阻率为0.65mΩ·cm2,因此此欧姆接触适合在高温下使用.     

Reliability of Au/PZT/BIT/p-Si ferroelectric diode

A ferroelectric memory diode that consisted of Au/PZT/BIT/p-Si multilayer configuration was fabricated by pulsed laser deposition (PLD) technique. The reliability issues (I-V characteristics, capacitance retention, fatigue and imprint) were investigated. The I-V curve showed the conventional Schottky diode characteristics with a small current density of - 5.3×10 -10 A/cm2 at a voltage of - 4 V and 6.7×10-8 A/cm2 at a voltage of + 4V, and this characteristic can be maintained below 50℃. The capacitance variety of the ferroelectric diode was only 5 % in 10 hours after withdrawing the applied bias of + 5 V or - 5 V, indicating the diode had good capacitance retention. By applying 100 kHz bipolar pulses of 5 V amplitude, the decay in remanent polarization was only 10% after 109 switching cycles, and meanwhile the increase in coercive field was 12%. After being irradiated for 20 min with a 200 W ultraviolet ray lamp, the remanent polarization and coercive field had both varied, and a voltage shift was obse     

St/BA/MAA/AA/VAC复合乳液的合成及其应用

采用半连续乳液种子聚合法合成苯乙烯(St)、丙烯酸丁酯(BA)、甲基丙烯酸(MAA)、丙烯酸(AA)、醋酸乙烯酯(VAc)的复合乳液。分析了丙烯酸对乳液电解质性能的影响,引发剂对聚合反应转化率的影响及乳化剂含量对乳液粘度的影响。通过正交试验确定组分的适当配比。该共聚乳液的粘度及固体含量符合要求,稳定性好,性能价格比高。应用表明:用此乳液配制成地毯乳胶,胶膜具有良好的机械性能。