切屑卷曲的力学分析及其应用

在试验和理论分析的基础上，本文提出了复合卷曲的切屑比向上卷曲的切屑、当侧卷程度较大时比例向卷曲的切屑易于折断的观点，并且讨论了切屑产生复合卷曲及侧向卷曲的条件，这些对断屑槽的设计和使用有重要意义。     

The intensity of resistance by mature Merino ewes against Haemonchus contortus and Tichostrongylus colubriformis in single-species and combined-species infection

Three-year-old, non-lactating and non-pregnant Merino ewes, raised on pasture under a program of strategic treatment with anthelmintic and found to be extremely resistant to "trickle" infection with Haemonchus contortus, were given single-dose infections with either H. contortus or Trichostrongylus colubriformis or both species together. The purpose was to ascertain the intensity of protective immunity against the 2 parasites in sheep with immunity acquired from a presumably slight exposure to infection. To provide a criterion, some infected ewes were immunosuppressed with corticosteroid, dexamethasone. Untreated ewes were extremely resistant to challenge infection with either 15,000 or 150,000 H. contortus or 15,000 T. colubriformis. Surprisingly, when mixed infection was given, egg counts for H. contortus were significantly elevated compared with infection by that species alone. Antibody to antigens from infective larval and adult H. contortus was measured in serum by enzyme-linked-immunosorbent assay (ELISA) during the course of infection. Serum titres against larval antigens were significantly depressed when infections with either H. contortus or T. colubriformis were permitted by immunosuppression with dexamethasone, whereas those against adult antigen were depressed when infection with T. colubriformis was permitted.     

猪肾脏中氯丙嗪和异丙嗪残留检测方法的建立

建立了猪肾脏中氯丙嗪和异丙嗪残留量检测的高效液相色谱法。猪肾脏中残留的氯丙嗪和异丙嗪,用乙腈提取,再依次用酸化乙腈和正己烷净化,氮气吹干,甲醇溶解后,用Waters高效液相色谱系统,HypersilC18柱,UV检测器,用V(乙腈)∶V(水)∶V(0.5mol·L-1乙酸铵)(50∶49∶1)为流动相,流速1.2mL/min,波长254nm测定,内标法定量。结果表明,氯丙嗪和异丙嗪在猪肾脏中的最低检测限均为10μg/kg,组织中添加量为10μg/kg时,氯丙嗪和异丙嗪的回收率分别为83%和84%,批间变异系数均小于20%。该方法样品处理简单,可同时检测氯丙嗪和异丙嗪在猪肾脏中的残留量。     

消费者价格指数与生产者价格指数“倒挂”之谜

消费者价格指数（Consumer Price Index,CPI）与生产者价格指数（Producer Price Index,PPI）是我国最重要的两个价格指数，一般说来，CPI与PPI应当是同步变化的.但是自2000年以来，CPI与PPI出现了多次“倒挂”现象，这无疑对当前经济通胀情况的判断带来了挑战.采用最新的X-13-ARIMA-SEATS方法对我国的CPI与PPI指数进行季节调整；在谱分析的基础上采用BK滤波方法将其趋势-循环因素进行分解得到趋势因素与循环因素.研究后发现是经济周期导致了“倒挂”现象.     

小型生物质直燃炉结构设计

基于目前现有生物质燃烧炉的燃烧效率低,且燃烧过程中焦油生成过多等问题。以高效率燃烧方式的薄层燃烧为该小型生物质直燃炉的主要燃烧方式,大大提高燃烧效率的同时,有效较低焦油与烟尘的产生,并且采用螺杆输送装置对炉膛进行持续供料,实现稳定的不间断燃烧,为成功解决农村生物质燃料浪费及环境污染起到积极作用,为新形势下的能源可持续发展提供思路。     

农田平地机激光发射平台调平控制系统设计

为使农田平地机双源激光定位系统的激光发射平台检测数据更精确、调平实时性更好,设计了激光发射平台自动调平控制系统。该系统采用三脚支撑的平台支撑方式,利用倾角传感器检测平台的倾斜度,通过步进电机驱动平台3条支腿伸缩从而实现平台调平。通过加入倾角传感器数据处理算法和基于RBF神经网络的智能PID控制算法,激光发射平台检测的数据更精确,能满足双激光源定位系统的要求,使农田平地机平地作业更精确。     

p38MAPK信号通路选择性调节FSH对甾体生成 的诱导作用研究

利用乙烯雌酚（DES）处理23日龄SD大鼠，分离卵巢颗粒细胞(GC)进行无血清培养。结果表明，FSH (50ng/m1) 处理GC，可迅速激活有丝分裂原蛋白激酶（p38 MAPK），FSH处理5min便可观察到磷酸化的p38 MAPK；FSH处理30min，磷酸化的p38 MAPK水平达到最高;向培养液中加入H89(蛋白激酶A抑制剂，10μM)，则显著抑制了FSH对p38 MAPK的激活作用，提示这种激活作用依赖于蛋白激酶A(PKA)。用 SB203580(p38MAPK抑制剂，20μM)抑制p38 MAPK激活，则进一步提高了FSH对孕酮和甾体生成快速调节蛋白（StAR）的诱导作用，同时降低了FSH对雌激素生成的促进作用(p<0.01)。RT-PCR结果显示：抑制p38 MAPK活性后，FSH对StAR mRNA刺激作用明显增强，但对细胞色素P450芳香化酶（P450arom）mRNA的诱导作用却减弱了(p<0.05)。激光共聚焦和蛋白印迹结果显示：在GC中，StAR蛋白主要分布在线粒体中；与对照组相比，FSH显著提高了StAR的荧光强度和蛋白水平；抑制p38MAPK活性则增强了FSH对StAR蛋白表达的诱导作用。     

A Fast One-Step Scanning Thinning Algorithm

A new quick thinning algorithm was presented in this paper,which assigneddifferent weights to different pixels near the skeleton pixels and rules out the im possible pixels in thethinning procedure. It needs neither iteration on pixel panel nor detection on every pixel such thatthe time consumed is greatly lessened. A filling algorithm is also offered for better results.Experiment on variety of binary patterns showed that it could get both a high speed and a goodskeleton shape compared with other algorithms,This new algorithm reaches perfect result.