光伏玻璃丝印背板常见问题及分析

光伏背板玻璃丝网印刷后能有效提高其反射率,从而提高光伏组件的发电功率.通过采用千分尺、百格刀、张力计检测,分析了光伏玻璃丝网印刷过程中产生的缺陷.发现玻璃整洁度和钢化炉温度对附着力有很大影响;网版感光胶厚度不均、网版张力小、刮刀压力大、油墨黏度小会有油墨层边缘缺陷;刮刀损伤、玻璃厚薄差大会有着墨不匀缺陷;油墨颗粒大、印刷台版不平、制网版时有灰尘、刮刀压力过小、玻璃弯曲度大、网版感光胶厚度薄会有针孔缺陷;丝印机定位故障、网版尺寸变化、玻璃对角线变化会出现印刷尺寸不合格的缺陷;刮刀压力大、网版上有针孔、网版版膜受损会有印版漏墨等缺陷;网距过高、刮刀压力大、洗网版时用力过大、玻璃破碎会影响网版的使用寿命.通过分析,丰富了光伏玻璃的丝网印刷知识,对企业的生产有一定的指导意义.     

2.5 mm光伏玻璃物理钢化常见缺陷分析

上弯、下弯、弹弯、发软、S弯、破片是2.5mm光伏玻璃钢化生产过程中常见的缺陷,严重影响玻璃产质量.针对生产过程中的各类钢化缺陷,通过塞尺、直尺、金属线检测,分析其产生原因、找出相应的解决办法.     

N-乙氧基羰基-N,N',N'-三甲基胍高效液相色谱分析方法研究

N-乙氧基羰基-N,N',N'-三甲基胍(简称:三甲基胍)是合成高选择性森林除草剂环嗪酮的主要中间体,国内未见高效液相色谱检测方法的报道,我们采用反相高效液相色谱法对三甲基胍进行了定量分析研究,流动相为:V(水)︰V(乙腈)=90︰10,使用ODSC18为填料的不锈钢柱及具可变波长的紫外检测器.本方法的变异系数为0.19％,标准偏差为0.15,平均回收率为99.56％,经优化后的检测方法简捷、准确,能满足工业化产品定量检测需要.     

Pattern design and optimization of yarn-dyed plaid fabric using isolation niche genetic algorithm and rough set theory

Under the circumstance of perceptual consumption, it is still challenging to grasp consumer's emotions and demands due to the large search space, diversified preferences, and easy fatigue of consumers. To reduce user fatigue and enlarge search space, a novel method was presented to design and optimize the pattern of yarn-dyed plaid fabric using the isolation niche genetic algorithm and rough set theory. Each pattern was encoded as a chromosome based on the real number code. The population was initialized and evolved using INGA to maintain the diversity. The rough set theory was adopted as the fitness function of isolation niche genetic algorithm to extract the consumer's demands. After multiple evolutions, a large set of practical patterns of the yarn-dyed plaid fabric are obtained. Experiments were carried out by 24 testers of different ages and genders. The results prove that the proposed method based on the isolation niche genetic algorithm and rough set theory is feasible and effective, supplying references to the designer.     

人造金刚石填充聚酰亚胺树脂基复合材料防刺性能

为研究树脂材料的防刺性能及防刺机制,利用手糊成型与热压法成型制备了手糊分层结构和均布结构层2种结构的人造金刚石填充聚酰亚胺树脂基复合树脂片,并探讨了人造金刚石粒径、填充体积分数对树脂片防刺性能的影响。研究结果表明:经过人造金刚石填充的聚酰亚胺树脂片的防刺性能得到提高,并且均布结构层分层复合结构的树脂片的防刺性能更好;随着人造金刚石粒径的减小,树脂片防刺性能出现先减小后增加的趋势,故防刺机制基本在于碰撞概率与树脂基的防挡;比较防刺力和消耗功发现,不同填充体积分数的单层防刺树脂片的防刺性能随人造金刚石填充体积分数的增加而逐渐降低,该趋势的成因在于复合树脂片的脆化与破坏;在颗粒等效粒径为300 μm、体积分数为10%时,其防刺性能最好。     

Reaction environment self-modification on low-coordination Ni2+ octahedra atomic interface for superior electrocatalytic overall water splitting

Large scale synthesis of high-efficiency bifunctional electrocatalyst based on cost-effective and earth-abundant transition metal for overall water splitting in the alkaline environment is indispensable for renewable energy conversion. In this regard, meticulous design of active sites and probing their catalytic mechanism on both cathode and anode with different reaction environment at molecular-scale are vitally necessary. Herein, a coordination environment inheriting strategy is presented for designing low-coordination Ni²⁺ octahedra (L-Ni-8) atomic interface at a high concentration (4.6 at.%). Advanced spectroscopic techniques and theoretical calculations reveal that the self-matching electron delocalization and localization state at L-Ni-8 atomic interface enable an ideal reaction environment at both cathode and anode. To improve the efficiency of using the self-modification reaction environment at L-Ni-8, all of the structural features, including high atom economy, mass transfer, and electron transfer, are integrated together from atomic-scale to macro-scale. At high current density of 500 mA/cm², the samples synthesized at gram-scale can deliver low hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 262 and 348 mV, respectively.

     

固溶处理对TiB2/6061复合材料硬度及耐磨性的影响

采用氟盐法制备了TiB₂质量分数为3%的原位合成TiB₂/6061复合材料,研究了固溶温度和固溶时间对复合材料硬度和耐磨性能的影响。结果表明:TiB₂颗粒弥散分布在6061铝合金基体中,明显细化6061铝合金基体晶粒。当固溶温度一定时,随固溶时间延长,复合材料的硬度和耐磨性可获得明显提高,但固溶时间在6~10 h时,复合材料的性能变化不显著。当固溶时间一定时,随固溶温度升高,复合材料硬度和耐磨性呈现先上升后下降的趋势。3wt%TiB₂/6061复合材料经530 ℃×10 h固溶处理后,硬度和耐磨性能最佳,相较于铸态硬度值提高了79.5％,磨损量减少了59.1%。固溶处理后复合材料的磨损表面犁沟变细变浅,材料脱落现象减少。     

乳酸菌对红曲黄酒品质的影响研究

该研究通过传统可培养法从米酒样品中分离出9株乳酸菌,在相同的条件下添加9株乳酸菌发酵制备红曲黄酒,并采用酸碱直接滴定法、折光仪法、高效液相-示差折光法和电子舌技术,同时结合统计学的方法对添加不同乳酸菌制备的红曲黄酒的总酸、可溶性固形物、有机酸含量和滋味品质进行评价。结果表明,这9株乳酸菌发酵制备的红曲黄酒总酸、可溶性固形物、有机酸的含量和滋味较未添加乳酸菌制备的红曲黄酒有较大差异,且添加乳酸菌发酵的红曲黄酒的可溶性固形物的含量显著高于对照组,总酸的含量的低于对照组,并经主成分分析可知相同种类的乳酸菌发酵红曲黄酒样品的品质有相似的影响。     

鱼肉质构的影响因素及测定方法研究进展

鱼类产品是居民膳食重要的动物性蛋白源, 而质构特征是评价鱼肉品质的关键指标。为系统总结分析影响鱼肉质构的主要因素, 本文首先分析了鱼肉质构与肌纤维、结缔组织及肌内脂肪的内在关系; 在此基础上, 从养殖方式、饲料配方、捕获季节及处死方式等角度综述了影响鱼肉质构的外在因素, 并分析了内源蛋白酶降解、细胞冷冻冰晶损伤及蛋白冷冻变性在低温贮藏鱼肉质构软化中的作用; 最后总结了鱼肉质构的仪器测定方法, 旨在为鱼类产品食用品质评价及控制提供理论参考。