电控喷油器流量性能检测试验装置

设计的电控喷油器性能测试装置,可有效检测喷油器的主要性能指标,为提高发动机燃油动力性、经济性以及降低排放提供了技术支持。检测试验证明,该测试装置具有效率快、精度高、性能稳定的特点,具有实际应用价值。     

基于键合图理论的动力稳定装置轮轨间动态特性分析

考虑动力稳定装置的轮轨非线性接触、轮轨间的间隙传动、夹钳油缸和水平油缸的等效刚度建立了动力稳定装置动态特性键合图模型.使用分段函数表达式实现了轮轨间的间隙传动.针对不同夹持力对于能量的传递效率与作业效果进行了深入分析与探究,确定了所需最小的水平油缸的推力.     

三七及竹节参中皂甙的不同提取方法

采用冷浸、回流、微波等方法提取三七及竹节参皂甙,按光密度值分别计算出三七及竹节参皂甙的含量。结果显示,微波提取法与冷浸、回流法相比提取率稍高,并且微波提取法操作简单、安全、省时。因此,微波提取法将使三七和竹节参资源得到更好的开发和利用。     

一种新型集蔗器的结构设计及其有限元分析

集蔗器是甘蔗收割机中用来收集甘蔗的装置。通过总结前人所设计的集蔗器的优缺点,提出了一种新型集蔗机构—挡板式斜集集蔗器,并进行了结构设计、参数计算和三维建模;最后,为了验证所设计的集蔗器转轴的尺寸的合理性,通过有限元分析了软件ANSYS分析它在受外力情况下的变形情况和整体的应力分布情况。     

Study on Technology of Black Silkies Chicken Semen Freezing by DMA Pellet

The aim was to explore the effects of different kinds of dilution and thawing devices on the N,N-dimethylformamide (DMA) pellet frozen semen of Black Silkies. Firstly,the motility and fertility of the frozen semen thawed by different dilutions were compared;Then,the motility of the frozen semen was compared when the pellets were thawed using different tube and different number.Finally,the motility and fertility of the sperm thawed by three kinds of thawing devices (thermostat water bath,hotfunnel and hotplate ) were tested. The results showed that:①There was similar order of the sperm motility and fertility in the different dilution groups (LR > F > B > L),and there was significant difference among those groups (P < 0.05).②The motility was the best when the frozen semen was thawed with large thin-wall glass tube at 60℃.③The best temperature range of the 3 devices was different. The highest motility for thermostat water bath was 50 to 60℃ (0.51 to 0.59),and thermostat hotfunnel was 40 to 45℃ (0.42 to 0.46),while thermostat hotplate was 50 to 55℃ (0.61 to 0.63).There was no significant difference of the motility in the optimum temperature range for each device (P > 0.05).④The fertility of the different devices in their best thawing temperature was 26.91% (55℃,thermostat hotplate),23.08% (60℃, thermostat water bath), 20.93% (40℃, thermostat funnel),respectively,and there was no significant differences among those groups (P > 0.05).Therefore,the efficiency thawing condition for the Black Silkies frozen semen was the LR diluent,DMA cryoprotectant,pellet freezing,thawed in the thermostat hotplate at 54.9℃.     

EVALUATION OF MAGNETIC RESONANCE SAFETY OF VETERINARY RADIOFREQUENCY IDENTIFICATION DEVICES AT 1 T

Implants containing metallic components have the potential to become heated or move within the patient while in the magnetic resonance (MR) environment. Despite containing a ferromagnetic core and having been in use for over 20 years, no information is available on the safety of veterinary radiofrequency identification devices during MR examinations. These devices are the most commonly encountered metallic implants in dogs and cats undergoing MR imaging. Three commercial veterinary microchips were evaluated for safety in the MR environment at 1 T. Parameters tested were translational force, torque, heating, artifact production, and function. Translation and torque were larger than that expected from normal activity under normal gravity. No significant heating was observed. Signal void artifacts may affect diagnosis if they are too close to the area of clinical importance. Microchip function was unaffected by routine clinical MR imaging. Capsule formation around devices is a major factor in counteracting translation and torque. Our findings support that is acceptable for patients to undergo MR imaging with this 1 T system following an interval of 3 months postimplantation to allow capsule growth. Because of the complex interactions involved, these observations may not be translatable to MR scanners of different field strength and/or manufacturer. Further safety testing of these and other radiofrequency identification devices is therefore recommended at different field strengths and equipment specifications.     

FUNCTIONALITY OF VETERINARY IDENTIFICATION MICROCHIPS FOLLOWING LOW‐ (0.5 TESLA) AND HIGH‐FIELD (3 TESLA) MAGNETIC RESONANCE IMAGING

The ability to read patient identification microchips relies on the use of radiofrequency pulses. Since radiofrequency pulses also form an integral part of the magnetic resonance imaging (MRI) process, the possibility of loss of microchip function during MRI scanning is of concern. Previous clinical trials have shown microchip function to be unaffected by MR imaging using a field strength of 1 Tesla and 1.5. As veterinary MRI scanners range widely in field strength, this study was devised to determine whether exposure to lower or higher field strengths than 1 Tesla would affect the function of different types of microchip. In a phantom study, a total of 300 International Standards Organisation (ISO)‐approved microchips (100 each of three different types: ISO FDX‐B 1.4 × 9 mm, ISO FDX‐B 2.12 × 12 mm, ISO HDX 3.8 × 23 mm) were tested in a low field (0.5) and a high field scanner (3.0 Tesla). A total of 50 microchips of each type were tested in each scanner. The phantom was composed of a fluid‐filled freezer pack onto which a plastic pillow and a cardboard strip with affixed microchips were positioned. Following an MRI scan protocol simulating a head study, all of the microchips were accurately readable. Neither 0.5 nor 3 Tesla imaging affected microchip function in this study.     

残膜回收机带式卷膜装置设计与试验

为解决现有残膜回收机集膜装置在集膜和卸膜过程中残膜质地松散、作业效率低等问题,设计了一种带式卷膜装置.阐述了该带式卷膜装置的基本结构和工作原理,通过理论分析确定了关键部件结构参数,分析了卷膜作业过程,经过计算分析得到可卷收残膜膜卷的最大直径、卷膜速比范围、卷膜倾角范围.采用三因素三水平Box-Behnken试验设计方法...