A comparison of quality parameters of fresh feline ejaculates collected by three different collection techniques

The aim of our study was to compare the quality parameters of fresh feline ejaculates collected by three different techniques—urethral catheterization after medetomidine administration (CT), electroejaculation (EE) and epididymal slicing after orchiectomy (EP). A total of 34 adult male cats (Felis catus) were included in the study. In all male cats, the sperm collection was performed under general anaesthesia by three collection methods in the following order: urethral catheterization, electroejaculation and epididymal slicing. The sperm parameters evaluated were as follows: volume, motility, viability, sperm concentration, total sperm count and morphological examination. The highest quality semen parameters were achieved using EE. The comparison of results of the evaluated sperm quality parameters from EE and EP showed significant differences only in one case—the percentage of head abnormalities and lower percentage of head abnormalities were achieved using EE compared to EP: 8.5% (3.0%–21.0%) versus 10.0% (4.0%–22.0%). Semen collected by CT rendered the lowest quality samples when compared to sperm samples collected by EE and EP, especially with respect to the motility and total sperm count which were significantly lower (p < 0.001). Our study showed that sperm samples collected by EE and EP result in better quality of feline ejaculates compared to collection by CT from sperm samples collected from the same male cats. These results demonstrate the necessity of further research of urethral catheterization as a novel technique of semen collection in male cats.     

辣椒切片机设计与试验

针对新疆地区辣椒烘干时间长、人工切片效率低、工作量大等问题,设计一种辣椒切片机。通过理论分析与参数计算确定辣椒切片机的关键部件结构和工作参数,运用性能试验,选取影响辣椒切片机工作性能的切割圆盘转速、输送带线速度和切割圆盘高度为试验因素,以切片完整度为试验指标,进行二次旋转正交组合试验,建立试验指标与影响因素回归模型,确定辣椒切片机最优作业参数组合为切割圆盘转速118 r/min,输送带线速度0.5 m/s,切割圆盘高度10 mm。通过试验验证,在该最优参数组合下,切片完整度为97.85%,与模型预测结果基本一致,相较人工切片效率提高344%,可满足新疆地区辣椒切片作业要求。     

SLS成型农机部件的切片算法研究

传统的农机设计方法开发周期长、成本高.采用SLS技术可以缩短生产周期,提高农机生产企业的市场竞争力.为此,分析了当前SLS快速成型系统等厚度切片的缺点,提出了基于三角面片外法矢量的自适应切片算法.结果表明,该算法在保证精度的同时也提高了成型效率.     

不同压尺结构对纵向刨切单板背面裂隙和表面粗糙度的影响研究

结合已有的压尺结构,通过试验比较不同压尺结构对单板刨切质量的影响,为今后刨切单板中压尺的设计和制造提供参考。     

单板纵向刨切背面裂隙形成及影响因素

利用摄像机拍摄单板的刨切过程,及采用放大镜观察纵向刨切单板背面裂隙度。采用正交试验,分析了单板刨切厚度、刃倾角和刨切速度对单板背面裂隙的影响。结果表明:单板背面裂隙度随着刨切厚度、刃倾角和刨切速度的增加,都有不同程度的增加,而刨切厚度对单板背面裂隙度影响显著。     

Effect of end-taping and removal of sapwood on radial distribution of moisture content and tangential strains during radio-frequency/vacuum drying of <Emphasis Type="Italic">Cedrela sinsensis</Emphasis> log cross sections

This study was carried out to investigate the effects of end-taping of sapwood (ETS) and removal of sapwood (ROS) treatments of log cross sections on the radial distributions of moisture content (MC) and tangential strain, according to the circumferential slicing method (CSM), during radio-frequency/vacuum (RF/V) drying of log cross sections. The MC of control and ETS samples showed an even distribution around the center but decreased closer to the periphery side. In ROS samples, the MC decreased closer to the periphery side when above the hygroscopic range but showed an even distribution at the late stage of drying. Tangential strain in ETS samples showed slight compressive stress or tensile stress through the entire area of the cross section during the initial stage of drying, although the periphery side was in tensile stress from an area starting at a relative radius of 0.7. ROS samples showed tensile stress in the heartwood around the center and the heartwood of the periphery side and showed no stress or slight compressive stress in the middle area at the initial stage of drying, after which it showed an even distribution of tensile stress throughout the entire end surface. About 90% of the total checks contained in ETS and ROS samples were observed on the periphery side starting from a relative radius of 0.7.     

材料处理与切片方法对柑橘叶脉荧光显微观察的影响

植物组织结构与细胞形态学观察是植物系统分类、遗传演化、抗逆反应等的主要研究方法之一。为了简便、有效的进行植物组织细胞的显微观察,本文研究了不同材料处理和不同切片方法对柑橘叶脉组织细胞荧光显微观察的影响。结果表明：利用荧光显微技术可以简便、有效的观测柑橘叶脉的组织结构和细胞形态;新鲜样品徒手切片和冷冻切片、FAA固定样品冷冻切片在荧光显微镜下都可以得到较佳的观测效果;几种样品处理方法各有优缺点,研究中可以根据具体情况灵活选用。     

面包质构特性测定方法的研究(Ⅲ)——面包样品切片方法、测试部位及环境温湿度对面包硬度测定值的影响

利用质构仪并参考采用AACC 74-09标准测试方法,对不同品质面包粉制作的面包样品进行了质构特性测定实验,探讨了面包样品切片方法、面包片压缩测试部位及面包样品制作与测试环境温湿度对面包硬度测定值的影响。结果表明:与面包切片厚度12.5 mm×2mm相比,面包切片厚度为25 mm的硬度测定平均值较大,且其变异系数较小;面包4切片和3切片方法的面包硬度测定值的变异幅度没有差别;面包硬度测定值随测试部位下移逐渐增大,面包上部与中部的硬度变化平均为1.5 g/mm、中部与下部硬度平均变化为8.1 g/mm;面包样品制作与测试环境温度对面包硬度测定值有较大影响,在21℃以下时,不同温度条件下的面包硬度测定值的差异较大,而面包硬度测定值的变异幅度相对较小。     

竹材刨切工艺的初步研究

毛竹经横截、去节、冲条、刨削等工序，加工成长条；再经干燥、涂胶、组坯、热压等工序，制成竹方；然后经高温水煮软化处理，在刨切机上进行横向热刨切，刨切成竹单板，用于高档贴面装饰，减少贵重木材的消耗。     

莱氏切片法测定木材管胞长度

研究了莱得尔切法测定木材管胞长度过程中的具体实现方法，了采和该方法在实验测试过程中的精确度问题，并且与离析法测定管胞长度进行比较，分析了采用该方法测一的可信度，结果表明，该方法完全可以满足测量管胞长度的需求、具有测量速度快、并能确定所测管胞的准确位置，是研究木材生长轮管胞长度变异规律的有效方法之一。