细支高密牛仔布使用新型浆料无PVA上浆实践

基于现阶段细支高密织物存在着织造上的难题,选用新型浆料CD-DF333对细支高密牛仔布进行上浆。结果表明:CD-DF333浆料粘附性强、流动性好,浆膜完整,浆纱增强率高;搭配CD-PW100助剂完全取代PVA205等浆料后,浆纱的伸长与减伸率有一定改善,浆膜柔软且牢固,落浆少,毛羽贴服好,织机效率提高了5%左右,浆料成本降低了20%以上;选用浆料CD-DF333对纱线上浆能够明显提高织物的织造性能。     

吉林棉田金矿区成矿地质特征及找矿预测

棉田矿区位于吉林省东部,是以石英脉型和破碎蚀变带型为主的金矿床,区内矿产资源丰富,构造发育,为金矿富集提供了有利环境.通过总结该矿床的地质特征,分析矿床类型和成因,归纳出找矿标志,对矿区进行了成矿预测.在矿区开展了成矿预测研究,指出下一步找矿方向.     

Effects of feeding intensity during the dry period. 1. Feed intake,body weight,and milk production

The objective of this experiment was to study dry matter intake (DMI), body condition, milk yield, and milk composition in cows with different body condition at the time of parturition. Twenty four multiparous cows with genetic merit for high or low milk fat content were assigned to one of three diets during the dry period. The treatments consisted of 6, 9, or 14.5 kg dry matter of a total mixed ration providing 71, 106, or 177 MJ/d of metabolizable energy and are referred to as low (L), medium (M), and high (H) dry period rations, respectively. These diets were introduced when the cows were dried off from the previous lactation, at least 8 wk before expected parturition. After parturition all cows were fed another total mixed ration ad libitum. The dietary treatments generated differences between the groups in body weight as well as in body condition score at parturition. There were no differences in DMI in early lactation, but during wk 6 to 12 DMI was lower among H cows, which was linked to a prolonged negative energy balance in this group. The milk yield was 38.5 +/- 0.8 kg of energy-corrected milk the first 4 wk postpartum and did not differ between treatments or selection lines. Body weight loss mainly occurred in lactation wk 1 to 4 and was greatest in H cows. The mobilization of body tissues was reflected in a higher milk fat content of C18:0 for the H cows during wk 1 to 4. There were no marked effects of treatments on milk fat content or milk protein content, which indicates that cows in early lactation have a potential to compensate for low nutrient intake during the dry period if they are offered a high-quality diet. The observed differences between treatments in DMI wk 6 to 12 could not be explained by differences in milk yield or mobilization of body tissues. Milk fat content was 4.7% in cows with genetic merit for high milk fat content and 4.2% in cows with genetic merit for low milk fat content. There was a tendency for higher body weight in cows with genetic merit for low milk fat content throughout the experiment.     

源于《化工原理》的《食品工程原理》教材编写创新研究

针对国内《食品工程原理》本科教材编写的现状,我们提出了需要创新编写思路的问题,从借鉴国际先进的教育指导思想、采用新主线系统化和简化内容、融合创造意识、融合现代计算技术四方面考虑,探索了《食品工程原理》教材编写创新的可能途径。借鉴国际先进的教育指导思想、融合现代计算技术以学习国际先进经验达到编写出新;采用新主线系统化和简化内容、融合创造意识则是主动创新,两者结合可以编写出新的《食品工程原理》教材。     

热电厂给水再循环管道振动原因分析及治理

惠州大亚湾热电厂给水再循环管道在机组启停过程中存在剧烈振动.结合管道模态计算,找到引起给水再循环管道振动的原因是管道限位支架失效,管道刚度较小,固有频率低,通过提高管道一阶固有频率,有效地消除给水再循环管道的振动.实践表明,该治理方案可行,振动消除效果明显.     

换相期间无刷直流电机转矩脉动的抑制策略

无刷直流电机的转矩脉动是影响其性能的重要因素.针对换相期间的转矩脉动进行了分析,重点研究了非理想反电势、关断相和开通相相电流变化速率不等这两个因素引起的转矩脉动,为了抑制这两个因素引起的转矩脉动,提出了分段控制的策略.该策略集成了转矩直接控制和重叠换相法的优点,可以有效抑制由非理想反电势、关断相和开通相相电流变化速率不等引起的转矩脉动.通过仿真分析验证了该方法和其中两种方法单独应用时的差异,证明了分段控制策略在换相期间抑制转矩脉动的有效性.     

水蒸气蒸馏与顶空进样GC-MS分析北柴胡挥发性成分

目的研究不同采集方法制备的北柴胡中挥发油化学成分。方法分别采用水蒸气蒸馏法和顶空进样技术提取北柴胡的挥发性成分,对其进行气相色谱-质谱(GC-MS)分析。结果两种提取方法无论在成分还是相对含量方面均有一定差异,采用水蒸气蒸馏法可鉴定36种挥发性化学成分,顶空进样技术可鉴定31种挥发性化学成分,共有成分为4种,且相对含量有差异。结论两种样品采集方法分别提供了不同沸点北柴胡挥发物的化学信息;运用这两种方法可建立更全面的北柴胡挥发性成分GC-MS表征体系。     

基于Pro／E和ADAMS的水下机器人设计方法研究

在传统的ROV（RemotelyOperatedVehicle）设计中．计算重量、排水量、浮性、稳定性等内容贯穿整个设计过程．工作量较大。采用Pro／E与ADAMS联合仿真的方法,简化了ROV平衡设计中的反复计算,使设计中的变动能够直观地在ROV性能上表现出来。以某型ROV为例。采用该方法进行仿真分析和实例验证,证明了改进方法的有效性。     

Effects of precursor solution concentration on dielectric properties of （Pb,La） （Zr,Ti）O3 antiferroelectric thick films by sol-gel processing

Pb0.97 La0.02 Zr0.95 Ti0.05 O3 （PLZT） antiferroelectric thick films derived from different precursor solution concentrations are prepared on platinized silicon substrates by sol-gel processing.The films present polycrystalline perovskite structure with a （100） preferred orientation by X-ray diffraction （XRD） analysis.The antiferroelectricity of the films is confirmed by the double hysteresis behaviors of polarization and double-bufferfly response of dielectric constant under the applied electrical field.Antiferroelectric properties and dielectric constant are improved while the polarization characteristic values are reduced with the increase of precursor solution concentration.The films at higher precursor solution concentration exhibit excellent dielectric properties.     

硅基PZT热释电薄膜三方-四方相变的拉曼散射研究

采用溶胶-凝胶法在硅衬底上成功制备出厚度约200nm的PZT薄膜,并以差热实验为基础,分别采用600℃、650℃和700℃三种退火温度,并对不同温度下的薄膜进行拉曼测试,分析三方-四方相变趋势,研究结果表明,中频区域的A1（2TO）振动模作为四方的一个标志,随着退火温度的升高强度逐渐增强,三方向四方转变;高频范围的A1（3TO）T振动模随着退火温度的升高强度也在逐渐增强,三方晶胞在减少而四方晶胞在增多,即随着退火温度的升高,三方有向四方转变的趋势。