Comparison of encapsulation properties of major garlic oil components by hydroxypropyl β-cyclodextrin

The major garlic oil (GO) components were encapsulated by hydroxypropyl β-cyclodextrin (HP-β-CD), and their encapsulation properties were compared in this study. Our results showed that the optimal conditions for the GO encapsulation were as follows: weigh ratio at 12:88 (GO: HP-β-CD), pH at 5.0, and inclusion time at 4 h. Furthermore, results from the phase solubility curves indicated that two components of diallyl disulfide (DADS) and diallyl trisulfide (DATS) had higher water solubility caused by HP-β-CD and that DATS-HP-β-CD complex had higher stability constant (K _1:1 = 6.702 × 10⁵) and more significant change in free energy ( \Updelta G_\textCOMP^* \Updelta G_{\text{COMP}}^{*}  = −3.496 × 10⁴) than DADS-HP-β-CD. These findings indicated that DATS was better suited to be encapsulated by HP-β-CD compared to DADS. The result finally obtained from gas chromatography–flame ionization detector (GC–FID) confirmed the easier inclusion properties of DATS by HP-β-CD.     

基于IEC 61850的电力设备远程控制方法

远程控制已成为确保电力系统安全稳定运行的重要技术手段,IEC 61850对电力设备的远程控制提出了更高的要求。以增强安全的操作前选择控制的有限状态机为基础,提出了基于IEC 61850的电力远动系统的远程控制模型。结合实际应用的需要,设计了基于IEC 61850的远方控制接口,实现了对智能电子设备（IED）的远程访问控制,对断路器进行了断开与闭合操作。基于上述研究所开发的系统通过了在某地区电网进行的工业现场试验并试运行,验证了模型的正确性和方案的可行性。     

水凝胶修井液破胶技术研究与应用

为解决水凝胶修井液完成修井作业后引起油气渗流受阻问题,优选了破胶液体系,即海水＋1．0％破胶剂HTS＋1．5％粘土稳定剂HXJ＋1．0％助排剂HRT＋2．0％缓蚀剂HCI。并对其破胶效果、配伍性、储层保护性进行了系统评价,结果表明,该破胶液具有较好的破胶效果、缓蚀性能和储层保护性,泥饼失重率和岩芯渗透率恢复值均在90％以上,与平湖气田地层水及水凝胶修井液滤液之间具有较好的配伍性。     

一种小型智能割草机器人的设计与实现

针对传统割草机污染高、噪音大和需要人工长时间操作等弊端,结合市场需求,研制了一款小型的可预约工作、自主回充的智能割草机器人。硬件上,系统以STM32为核心,由控制系统、动力系统、传感系统、通信系统和人机交互系统5部分组成;算法和软件上,采用自主回充方案,实现预约模式下机器人多次工作,减少人工操作;为解决机器人在斜坡上无法直线行进问题,设计了一种坡度补偿算法;同时为提高机器人的割草效率,提出了一种自主寻草算法。系统符合国际安全设计指标,经过长时间测试,机器在预约模式、自主回充模式均能稳定可靠的工作。     

8Mbit／s数字电视系统的设计与实现

介绍了８Ｍｂｉｔ／ｓ数字电视系统的系统构成，给出了图象压缩编解码，声音压缩编解码和数据通信接口的实现方案，对系统中所采用的新缓存控制策略也作了分析。     

Ti/WSi/Ni ohmic contact to n-type SiCN

Ti/WSi/Ni contact to n-type SiCN was investigated using the circular transmission line method. Current–voltage characteristics, X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the contacts before and after annealing. It is shown that the conducting behavior of the contacts is dependent on the annealing temperature. After annealing at 900 ℃ or above, ohmic contacts with specific contact resistivity were achieved. The 1000-℃-annealed contact exhibits the lowest specific contact of 3.07E-5 Ω? cm2. The formation of ohmic contact with low specific contact resistivity was discussed.     

基于多燃气动力的水下变深度发射内弹道

为研究水下变深度发射导弹的内弹道问题,通过由多个燃气发生器组成的弹射动力系统,建立了水下发射的内弹道计算模型,介绍了可同时满足多种深度发射的内弹道仿真方法,进行了仿真计算。结果表明:在20～60 m的深度范围发射,可以通过调节3个燃气发生器的点火时序,得到18.9 m/s±3.4 m/s的出筒速度调节范围。由多燃气发生器组成的弹射动力系统是解决变深度发射导弹的有效途径。     

设备在线振动监测与故障分析诊断技术在大型水泵机组中的应用

如何进一步提高大型水泵机组运行状态监测的自动化水平是科学管理、保障安全供水的重要课题。在线振动监测与故障分析诊断技术能够对大型水泵机组的运行状态进行有效监测,随时把握关键机组当前的运行状况,了解被监测水泵机组的状态变化趋势,分析诊断振动异常水泵的故障性质、部位、原因和严重程度,以及检查和验收大修或临时维修的效果,提高机组运行完好率,减少停机时间及降低维修成本,提升设备管理的现代化水平。主要对振动监测与故障分析诊断技术在大型水泵机组中的应用进行研究和综合论述,探讨了大型水泵机组运行中常见的故障,并通过案例说明了该技术对分析和判断机组故障的效果。同时以某大型泵站为例,具体阐述了该技术在大型卧式离心泵机组中的应用,为泵站大型水泵机组的设计提供解决方案。     

Statistical Study of Delamination Area Distribution in Composite Components Fabricated by Autoclave Process

As the most frequent defect in composite structures during fabricated by autoclave process, delamination has evidently influence on compressive behavior of delaminated composite panels. For structure design purposes, delamination area is of great importance parameter to be considered. Based on considerable delamination information from non-destructive identification for composite components, a statistical study was in detail presented to investigate how delamination area in different composite components distributed. The distribution model of delamination area was hypothesized and tested by normal W test and normal D test. With consideration combined by the dispersibility and the qualified rate of delamination area, an effective method for estimating the manufacturing quality of composite components was also established. The results indicated that a lognormal distribution was found to represent the delamination area quite well and about 100 mm² had the maximum probability. Moreover, the complexity and the thickness of composite structures had significantly influence on the qualified rate of delamination area. The more complex structure and the thinner or the thicker composites decreased the qualified rate of delamination area.     

基于多尺度线调频基稀疏信号分解的时变系统模态参数识别

在多尺度线调频基稀疏信号分解的基础上,提出一种时变系统的模态参数识别方法。该方法先采用多尺度线调频基稀疏信号分解方法对多自由度线性时变振动系统响应信号进行分解,将其分解成多个单模态振动响应信号并得到单模态振动响应信号的瞬时频率;再根据单模态振动响应信号的包络和瞬时频率识别系统的模态频率与模态阻尼比。多自由度线性时变振动系统模态参数的识别算例表明,与经验模态分解等时频分析方法比较,该方法能有效克服系统振动响应信号分解时的模态混淆问题,识别精度高,抗噪性能好,是一种有较大工程应用前景的多自由度线性时变振动系统模态参数识别方法。