基于EDEM的双排型孔轮式油菜排种器的排种性能分析

基于离散单元法和EDEM软件,建立了双排型孔轮式油菜排种器的离散元模型,对不同排种轴转速下种群扰动强度进行分析,研究排种轴转速和不同排型孔对排种器排种量和排种均匀性变异系数的影响。结果表明:当排种轴转速为30～90r/min时,单独使用第一排型孔排种,排种均匀性变异系数为42.75%～54.17%,单独使用第二排型孔排种,排种均匀性变异系数为38.46%～44.1%;排种器使用双排型孔同时排种,排种均匀性变异系数为28.2%～40.1%,双排型孔工作较单排型孔工作排种均匀性提高。该排种器种子充入型孔的极限转速为60 r/min,当转速为0～60 r/min时,单位时间的排种量呈线性变化,当排种器转速超过极限转速时,单位时间的排量相对减小。     

中国东南沿海中心渔港和一级渔港合理布局方法的研究

中国东南沿海是受热带气旋影响较为严重的区域,中心渔港和一级渔港是渔船安全避风的场所,而目前中国东南沿海现有中心渔港和一级渔港仅能满足43%机动渔船避风锚泊的需求。根据国家制定的新建和扩建一批避风能力达到11级的中心渔港和一级渔港,以满足70%机动渔船停泊避风需要的"十二五"渔港建设规划目标,本研究中以浙江省为例,将复杂的渔港选址问题运用数学方法予以处理,给出了浙江省拟建中心渔港和一级渔港的数量及其布局方案,并提出了台风登陆时拟建渔港的放大系数,为国家"十二五"渔港建设规划的实施提供了科学依据和技术支撑。     

烯丙孕素片的制备及质量研究

对烯丙孕素片的制备及质量进行研究。以药物的崩解时限和溶出度为主要指标,应用正交设计法对其处方进行优化,制备一种延缓崩解开始时间的烯丙孕素片,以适应不同猪场和环境的湿法饲喂需求。考察烯丙孕素片的外观性状、硬度、片重差异、脆碎度、崩解时限、溶出度、含量测定等,重点对烯丙孕素片的溶出度方法进行了研究。结果表明,烯丙孕素片外观性状、硬度、片重差异、脆碎度、崩解时限、溶出度、含量测定等结果符合要求,含量测定为标示量的90.0%～105.0%。崩解时限和溶出度结果表明,烯丙孕素片在遇水后7～15分钟全部崩解完毕,溶出度大于90%。研究所得烯丙孕素片的崩解时限延长了5～10分钟,且溶出度和含量均达标。由此确定研制的烯丙孕素片处方工艺可行,质量可控,符合拟定的质量标准。     

叶酸对铅中毒幼年大鼠中枢神经系统的保护作用

通过研究铅对大鼠中枢神经元的损伤以及应用叶酸后的影响，探讨了叶酸对铅中毒条件下中枢神经元的保护作用。将健康清洁级初断乳3周龄SD大鼠随机分为铅染毒组，叶酸给药组及生理盐水组。各组于处理后第2、3、4周取材。铅染毒组、叶酸给药组每组各30只，生理盐水组12只，共72只。测量血铅，分别进行海马和小脑组织的H—E染色及凋亡抑制基因Bcl—2、凋亡基因Bax的蛋白免疫电泳，并作光密度分析。结果，通过对各个时间段各组血铅测定，可得叶酸给药组血铅含量低于铅染毒组。铅染毒组Bcl-2蛋白表达量少于给药组，而Bax多于给药组，H—E染色结果铅染毒组神经细胞数量明显少于叶酸给药组。结果表明，叶酸可降低铅中毒大鼠的血铅浓度，并具有一定抗细胞损伤作用，对铅中毒大鼠的中枢神经元具有一定的保护作用。     

集中供热工程投资估算中的Excel应用

应用Excel计算集中供热工程的投资估算。首先创建估算的模板,再应用模板来计算具体建设规模的投资估算,其应用过程简便、快捷、准确、科学。     

林区公路中线测量计算的微机程序

本文介绍编制的BASIC程序,能承担线路中线测量各种曲线的计算工作,能进行多次快速拟定曲线半径,从而可以选择最合理的半径,能显示线路中线测量各曲线计算需要的数据和曲线里程桩号,并且可以重复显示有关数据,避免了重新输入变量的麻烦。使用该软件进行林区公路中线测量计算,其操作简便,运算速度快,计算精确,工效高。     

Possible Anxiolytic Effects of Ivermectin in Rats

Ivermectin, a mixture of 22,23-dihydroavermectin B_1a (80%) and B_1b (20%), is produced by Streptomyces avermectilis, an actinomycete. It is a macrocyclic lactone disaccharide, a member of the avermectin family, and is used as an antiparasitic drug. Previous studies performed in our laboratory showed that doramectin, another avermectin drug, interferes with GABAergic-related behaviours, leading to anxiety and seizures. The objective of the present study was to examine the effects of ivermectin (0.5 and 1.0 mg/kg) on the central nervous system of rats, using behavioural models related to GABAergic neurotransmission. A known anxiolytic drug, diazepam, was used as a positive control. Open field and elevated plus-maze behaviours, as well as conflict behaviour to a conditioned response, were assessed. The effects of ivermectin and diazepam in reversing the anxiety induced by picrotoxin was studied. The protective effects of ivermectin on pentylenetetrazole- and picrotoxin-induced seizures were also investigated. In the open field, 1.0 mg/kg ivermectin decreased locomotion frequency at 15 and 60 min of observation, rearing behaviour showed a biphasic effect at 15 and 30 min and duration of immobility was increased in all sessions after 1.0 mg/kg ivermectin. These data suggest anxiolytic or sedative effects. Ivermectin and diazepam both had a tendency to cause an increase both in the number of entries into the open arms and on the time spent in the open arms of an elevated plus-maze. Picrotoxin on its own reduced the number of entries as well as the time spent in the open arms. Both diazepam and ivermectin reversed these effects of picrotoxin. In conflict behaviour analysis, ivermectin and diazepam gave the classic effect of an anxiolytic drug, reversing the conditioned response to shock. Ivermectin protected rats from the convulsant effects of pentylenetetrazole but not from those of picrotoxin. Thus, ivermectin had the pharmacological profile of an anxiolytic drug with GABAergic properties. The lack of effect on seizures induced by picrotoxin suggests that the action of ivermectin is different from that of the benzodiazepine drugs.     

Evaluation of a Bacillus stearothermophilus tube test as a screening tool for anticoccidial residues in poultry

A Bacillus stearothermophilus var. calidolactis C953 tube test was evaluated for its ability in detecting the residue of selected anticoccidial drugs in poultry, specically sulfamethazine, furazolidone, and amprolium. Various concentrations of each drug were injected into chicken liver and kidney tissues and these tissues were tested to determine the drug detection limits for each drug. The detection limit was defined as the drug concentration at which 95% of the test results were interpreted as positive. The limits of detection in liver tissue were 0.35 µg/ml for furazolidone, 0.70 µg/ml for sulfamethazine and 7.80 µg/ml for amprolium. In kidney tissues, they were 0.30 µg/ml for furazolidone, 0.54 µg/ml for sulfamethazine, and 7.6 µg/ml for amprolium. It was concluded that this tube test could be used to screen for the residue of these three drugs in poultry.     

密植桃园的主干形修剪栽培试验

连续五年密植桃园的主干形修剪试验表明：主干形修剪技术用于密植栽培桃树早结果早丰产效果显著。‘春花’成苗定植后第二年产量达1300kg·666．7m-2,第三年为1500kg·666．7m-2,第四年为2250kg·666,7m-2,第五年为1750kg·666．7m-2;‘湖景蜜露’定植后第二年和第三年产量为1021kg·666．7m-2和1019kg·666．7m-2;‘锦绣’定植后第二年产量为120km·666．7m-2,第三年为1204km·666．7m-2,第四年为1876km·666．7m-2;‘沪463’定植后第三年产量为47．5kg·666．7m-2,第四年为2125kg·666．7m-2。主干形修剪夏季摘心可促进早期副梢的萌发,利用副梢坐果,均衡树势。主干形修剪对桃果实的品质有一定的影响,使果实相对变小,单果重减轻,要注意疏花疏果,加强肥水管理。     

中原农耕文化对河南企业文化建设思想的影响

从中原农耕文化的角度将中原文化与企业文化结合在一起,对塑造河南企业文化的影响思想进行了分析。