Optimization of multiple quality characteristics for polyether ether ketone injection molding process

This study examines multiple quality optimization of the injection molding for Polyether Ether Ketone (PEEK). It also looks into the dimensional deviation and strength of screws that are reduced and improved for the molding quality, respectively. This study applies the Taguchi method to cut down on the number of experiments and combines grey relational analysis to determine the optimal processing parameters for multiple quality characteristics. The quality characteristics of this experiment are the screws’ outer diameter, tensile strength and twisting strength. First, one should determine the processing parameters that may affect the injection molding with the L₁₈(2¹×3⁷) orthogonal, including mold temperature, pre-plasticity amount, injection pressure, injection speed, screw speed, packing pressure, packing time and cooling time. Then, the grey relational analysis, whose response table and response graph indicate the optimum processing parameters for multiple quality characteristics, is applied to resolve this drawback. The Taguchi method only takes a single quality characteristic into consideration. Finally, a processing parameter prediction system is established by using the back-propagation neural network. The percentage errors all fall within 2%, between the predicted values and the target values. This reveals that the prediction system established in this study produces excellent results.     

恩施玉露整形上光机的设计概念

恩施玉露是传统的针形名优茶,本文在对传统手工工艺分析的基础上,结合机械的概念设计,分析了整形上光机的开发思路、设计原理、设计方案和创新点,为这一新型针形做形设备的研究与开发为恩施玉露的发展,提供技术支撑。     

Optimization of dyeing condition for wool/cotton union fabric with direct dye using box-behnken design

Wool/cotton union fabric was dyed with a direct dye in union shade. The dyeing was performed in a single bath in relation to four factors: leveling agent (Lyogen SMKI, 0–1.5 % oww), electrolyte (sodium sulfate, 0–10 %), dyeing temperature (85–95 °C), and dyeing time (15–60 min). The dyeing was characterized by dye bath exhaustion (%), color strength (K/S value), washing fastness, and light fastness of dyed sample. Response surface analysis showed that the exhaustion of direct dye increased with electrolyte, dyeing temperature, and dyeing time while the K/S value followed a linear shape with leveling agent and dyeing temperature. An optimized recipe was formulated based on response surface strategy and numerical optimization solution.     

黑龙江省大豆油脂工业现状及发展方向

本文叙述了我国油脂工业面临的形势，并从生产规模及技术水平等方面对黑龙江省大豆油脂工业的现状进行了分析，对黑龙江省大豆油脂工业的发展提出了建议。     

天津棉花受除草剂伤害情况的调查分析

棉花属于双子叶常异花授粉作物,对除草剂反应非常敏感,易产生伤害。因为除草剂会破坏棉花植株的生长点、叶片,使植株生长发育受阻,从而降低产量,影响品质,造成大幅度减产,有的几乎绝收。天津东丽区2000年大面积种植棉花以来,在棉花生产上,已发生多起棉花受除草剂伤害的事件。笔者对2000。2007年期间,发生的棉花受除草剂的伤害进行了田间调查,并对典型事件的调查结果进行比较分析。     

Development of carbon composite bike fork using finite element analysis and a new pressure molding process

The aim of this study was to develop a new carbon composite part for a road bike. Through finite element analysis, an optimum structure of the bike fork including a lay-up sequence of each ply was obtained. The designed part was manufactured using a new press molding process called a “double blowing process”, which uses dual air bladders to remove voids inside the resin. The mechanical properties of the composite fork were characterized and compared with the analysis results, showing a reasonable agreement between them. The failure analysis was carried out using the Tsai-Wu criterion, demonstrating that the composite bike fork was well designed using the current methodology involving prototype design based on expert knowledge, refined design using finite element method, manufacture of the design part, and comparison between the experiment and simulation.     

哈尔滨市大豆加工业发展现状与优势分析

通过对哈尔滨市大豆产业现状全面深入的调查研究,对哈尔滨市大豆加工业在国际和国内的地位及哈尔滨市大豆加工业的优势进行分析。     

水稻免耕移栽与免耕抛栽技术

总结了湖南省汨罗市近20年来水稻免耕移栽或抛栽的技术经验.指出水稻免耕栽培具有省工节本、减少农耗时间和改善土壤结构等特点,生产实践中应掌握施肥、育秧、除草等关键技术.     

基于主成分分析的保靖黄金茶加工过程中氨基酸动态变化研究

以茶树品种保靖黄金茶1号为材料,研究了品质成分氨基酸总量及游离氨基酸组分在加工过程中的动态变化。结果表明,氨基酸总量呈“M”形双峰变化趋势,但产品的含量要高于鲜叶;SPSS主成分分析表明,加工过程中氨基酸总量的变化与天冬氨酸（Asp）和亮氨酸（Leu）变化呈极显著正相关,与茶氨酸（Theanine）呈显著正相关;与丙氨酸（Ala）、脯氨酸（Pro）呈显著负相关。同时,18种游离氨基酸对氨基酸总量变化的影响可分为3个主成分,第一主成分为天冬氨酸（Asp）、异亮氨酸（Ile）、茶氨酸（Theanine）、缬氨酸（Val）、苏氨酸（Thr）、精氨酸（Arg）、苯丙氨酸（Phe）7种氨基酸;第二主成分为甲硫氨酸（Met）;第三主成分为谷氨酸（Glu）、丝氨酸（Ser）、亮氨酸（Leu）、半胱氨酸（Cys）和组氨酸（His）;三个主成分的累积方差达到99．46％,可以解释加工过程中氨基酸的动态变化过程。     

扁形茶加工机械选型与加工工艺

1　多用机的运动机构与制茶性能目前多用机的运动机构主要有:曲柄导轮、曲柄导轨和曲柄摆杆三种类型。由于多用机运动机构不同,其槽锅运动轨迹亦不同,茶叶在槽锅中运动的受力方向、运动状态等亦不相同。而茶叶在多用机中要完成杀青、理条、辉锅等作业,每一作业要求茶叶在柄槽锅中运动状态亦不尽相同。如茶叶杀青要求茶叶在多用机槽锅中受到足够的上抛力作用,在某一瞬间锅内茶叶在力的作用下被推离锅壁作抛物线运动,由于茶叶的个体质量、形态的差异,茶叶散落现象明显,水分散发较充分,能及时带走湿汽以保持茶叶色泽的翠绿和清香,这是绿茶杀青…     

南方亚麻制纤技术及制纤设备

本文介绍了南方亚麻小型制纤加工机组的操作技术要领、设备主要技术参数及其维护方法；并通过亚麻的制纤加工试验，提出了南方亚麻规模化生产中尚需解决的几个关键技术问题。     

烘干温度对自茶护肝作用效果影响研究

萎凋适度的一芽二叶福安大白茶,一组用30℃烘干,另一组用120℃烘干.分剐制成白茶茶剂喂饲小鼠,研究其对CCl4致急性肝损小鼠的肝保护作用.肝组织病理切片结果表明,两种茶剂都能显著减轻CCl4对肝脏细胞的病理损伤(p＜0.01),但两茶剂处理间的差异不大.30℃烘干白茶高剂量处理的小鼠CSH、ALT、MDA分别是模型组的116.4%、71.2%(P＜0.01)和61.5%(P＜0.01);120℃烘干白茶高剂量处理的小鼠GSH、ALT/CPT、MDA分别是模型组的118.5%(9＜0.05)、85.1%(P＜0.01)和68.1%(P＜0.01).研究结果表明,烘干温度对白茶减轻Ccl4肝损伤的影响差异不显著,可见长时间萎凋是白茶具有护肝作用的关键加工工艺.     

焉耆糖区气象条件与甜菜含糖相关性分析

气象条件对甜菜的含糖有很大影响。在焉耆糖区干旱、人工灌溉的条件下,甜菜营养生长期内8月和10月份的温度与甜菜最终含糖关系最密切,呈显著正相关,日照时数与含糖呈正相关关系,降雨与含糖呈负相关,尤其在8月份,降雨多,空气湿度大,含糖下降。     

Evaluation and analysis the chalkiness of connected rice kernels based on image processing technology and support vector machine

In order to determine the location and type of rice chalkiness accurately, image processing techniques were adopted to process acquired rice kernel images. Connected rice kernels were separated from each other using a convex point matching method. Chalkiness was extracted according to the differences in grayscale levels between chalky and normal regions in the rice kernel and chalky rice kernels were classified by a support vector machine (SVM). The results showed that 2–5 connected rice kernels could be separated accurately using this method and chalky areas could be extracted. The classification accuracy for indica rice and japonica rice reached 98.5% and 97.6%, respectively, by using SVM. Hence, the measurement results are accurate and reliable, and the presented work provides a theoretical and practical basis for the further application of computer vision technology to chalkiness detection.     

Improvement of seedling establishment under flood condition by seed coating with molybdenum compounds for wheat and barley

Wheat and barley are often cultivated also in paddy fields in winter in Japan. The drainage of paddy fields is often poor. The seedling establishment of wheat and barley is more prone to become poor if it rains heavily after sowing. The flooding damage on seedling establishment is thought to be caused by many factors. The generation of sulfide ions in flooded and reduced soil is thought to be one factor of the flooding damage. In this study, the effect of seed coating with molybdenum compounds, which suppress the generation of sulfide ions, on the flooding damage of wheat and barley seedling establishment. Two poorly soluble molybdenum compounds were coated on wheat or barley seeds at different amounts. Coated seeds were sown in soil and soon flooded for 2 d at 20 °C. When seeds were not coated with molybdenum compounds, rates of seedling establishment were no more than 32%. However, when any molybdenum compounds of .05–.5 mol-Mo kg^?1 were coated, seedling establishment was significantly improved and rates of seedling establishment were no less than 54%. However, when sown seed were not flooded, the establishment rates of the seeds, which were coated with a molybdenum compound of no less than .1 or .2 mol-Mo kg-1, were significantly decreased. Accordingly, coating of molybdenum compounds could improve the seedling establishment of coated seeds under flooded condition, but might impair the seedling establishment of coated seeds under unflooded condition.     

云南大叶茶加工名优绿茶的技术

云南大叶茶由于芽体肥硕，茎长梗粗，茶多酚、咖啡碱、水浸出物含量远高于中小叶种，酚氨比高，向来被认为最适合制作滇红茶和普洱茶。制绿茶，条索粗大、色泽绿褐、滋味苦涩、香气欠爽，与我国传统绿茶风格相距甚远。为了适应市场产品结构的变化，将云南的茶树资源优势转化为产业优势，提高种植者效益，云南省普洱茶树良种场通过多年的研究和实践，摸索出了一套行之有效的大叶茶品种加工名优绿茶的技术。如用本场选育的新品种雪芽100号加工的“思茅雪兰”，外形似兰，色泽银绿，满披白毫，汤色浅绿明亮，嫩香持久，滋味醇厚，获1994年首届“中茶杯”名优茶评比特等奖，2001年第三届“云茶杯”评比中被评为云南名茶；用云抗10号制作的“卷云”分别获云南首届春茶交易会名优茶金奖、2000-2002年连续3届“云茶杯”金奖。     

Gas chromatographic studies on the suitability of irradiated potatoes for storage and processing

Summary In two series of experiments, batches of potatoes, some treated by irradiation and some with chemical sprout inhibitors, were processed into chips on an industrial scale after 7–8 months of storage. The quality of the chips and of the stored fresh potatoes was related to gas chromatographic analyses of sugar and acid contents. It was found that only the irradiated potatoes in which the content of fructose and glucose at the time of processing amounted to not more than 0.07% each of the fresh weight, yielded marketable chips of good quality. If the concentrations of reducing sugars were as low as this, then the rate of rotting was also very low, even in the irradiated batches. Shipment of the potatoes by truck over a distance of approximately 300 km after irradiation had no detectable deleterious effect.     

直播油菜施肥效应及适宜肥料用量研究

采用“３４１４”肥料效应试验设计方案进行田间试验,探讨直播油菜氮磷钾（ＮＰＫ）肥效应及肥料的适宜用 量。结果表明,ＮＰＫ配合施用显著提高了油菜产量,三因素增产大小顺序为Ｎ ＞Ｋ ＞Ｐ;油菜各器官养分含量和积 累量随相应养分的施用明显提高;试验条件下,Ｎ、Ｐ２Ｏ５和Ｋ２Ｏ用量为１８０、３０和９０ｋｇ／ｈｍ２时,氮磷钾肥表观利用 率最大,分别为３５．１％、２３．１％和７３．９％。用一元二次肥料效应模型对试验结果进行模拟,结果显示,直播油菜Ｎ、 Ｐ２Ｏ５和Ｋ２Ｏ适宜施用量为２１２、２３和１１２ｋｇ／ｈｍ２。