对心式低脉动度脉动式无级变速器传动效率的实验研究

设计并制造出对心式低脉动度脉动式无级变速器的实验样机,详细阐述了其基本结构与传动原理。采用试验研究的方法对其传动效率进行研究,搭建实验平台,并进行传动效率实验。实验结果表明,新型机的功率损失随输出转矩的增大先近似线性增加,后又趋于缓慢并且逐渐开始下降;在许用的输出转矩范围,新型机的传动效率与输出转矩呈线性关系

Bearing-only Target Pursuing Strategy for AUV Based on Short-term Planning

对自主水下机器人(AUV)追踪海洋生物的问题进行研究,由于被追踪目标的机动能力远优于追踪者,待目标运动要素的估计值收敛之后再规划追踪的路径可能错过接近目标的时机.针对这个问题,借鉴博弈的思想提出了一种基于短期规划的目标追踪算法.该方法首先构建AUV在短期内所有可行的行为集合,然后对每一个行为能够达到的状态进行态势评估,最后选择使AUV处于最有利的追踪态势的行为作为规划的结果.为了检验该方法,开展了2组仿真实验:第1组实验显示本文方法的追踪成功率比传统方法提高了5.2%,第2组实验表明即使在较大的测量误差下AUV依然可以有效地追踪到目标.仿真结果表明该方法提高了AUV追踪到目标的成功率,并且具有较好的鲁棒性.</p

基于Visual Basic的无级变速器脉动发生机构的运动仿真

利用Visual Basic面向对象以及包含协助开发环境的事件驱动为机制的可视化程序设计的特点,进行无级变速器脉动发生机构的运动仿真。从运动仿真中对脉动式无级变速器的机构性能进行研究。已探讨出了一种四边形的高效率脉动发生机构

Research on the control system of a class of underwater vehicle

As the safety and the importance performed by Human Occupied vehicle (HOV) increase, the problem of automatic control method for HOV is addressed in this paper. The automatic control schemes which guarantee high performances in horizontal and vertical plane motion has become a fundamental issue in hazardous underwater environment. The critical point in the considered application is the reduction of the overshoot in the system output response. Based on PID and fuzzy techniques, different control schemes are proposed and their performances compared through simulation and on the spot test. Copyright &copy; 2010 by The International Society of Offshore and Polar Engineers (ISOPE)

D-最优混料设计优化速冻专用油脂乳化剂配方Optimization of emulsifier formula of fast-frozen special fat by D-optimum mixture design

为解决速冻食品易开裂的问题，对速冻专用油脂乳化剂配方进行设计优化。首先以自制酯交换油脂为基料油，以吸水性和乳化稳定性为指标，对6种常用的亲油性乳化剂进行筛选，并采用D-最优混料设计确定最佳乳化剂配方，然后用该乳化剂配方制备速冻专用油脂，并将自制速冻专用油脂和两种市售速冻专用油脂制作速冻汤圆作应用对比试验。结果表明：以酯交换油脂为基料油的速冻专用油脂最佳乳化剂配方为硬脂酰乳酸钙添加量34.4%、单硬脂酸甘油酯添加量338%、大豆卵磷脂添加量31.8%，在此条件下复合乳化剂的吸水性为25.1 mL/10 g，乳化稳定性为933%；相比于市售速冻专用油脂，自制速冻专用油脂制作的速冻汤圆表面光滑、裂纹少，冻裂率和冷冻失水率低。因此，优化得到的速冻专用油脂复合乳化剂具备良好的乳化稳定性和持水能力，可降低速冻食品的冻裂率。In order to solve the cracking problem of fast-frozen food, the emulsifier formula of fast-frozen special fat was optimized. With water absorption and emulsifying stability as indexes, using self-made transesterification oil as base oil, six commonly used lipophilic emulsifiers were selected, and the best emulsifier formula was determined by D-optimum mixture design. In addition, the application of self-made fast-frozen special fat and two kinds of commercial fast-frozen special fat to produce fast-frozen dumpling was compared. The results showed that with self-made transesterification oil as base oil, the optimal emulsifier formula for fast-frozen special fat was obtained as follows: dosage of calcium stearoyl lactylate 34.4%, dosage of glycerol monostearate 33.8%, and dosage of soybean lecithin 318%. Under these conditions, the water absorption and emulsifying stability of compound emulsifier were 25.1 mL/10 g and 93.3%, respectively. Compared with the commercial fast-frozen special fat, the fast-frozen dumpling made by the self-made fast-frozen special fat had a smooth surface, fewer cracks, lower freeze-cracking rate and freezing water loss rate. The optimized compound emulsifier has good emulsifying stability and water-holding capacity, and can reduce the freeze-cracking rate of fast-frozen food

膜下滴灌方式下不同氯化钾肥在酱用番茄上的应用[J]

在灌耕灰漠土上采用膜下滴灌的方式种植酱用番茄，以常规施肥为对照，选择3种不同的氯化钾开展大田肥效试验。结果表明：3种钾肥均能提高酱用番茄单株结果数和单果质量，其中以加拿大氯化钾示范区增幅最高。各试验区番茄最终产量为加拿大氯化钾试验区82.004 t/hm2，青海湖（格尔木）结晶氯化钾试验区79.845 t/hm2，俄罗斯氯化钾试验区79.218 t/hm2，分别比对照增产8.50%、5.64%和4.81%。结果也显示，加施钾肥可增强番茄的抗逆能力。就综合性价比而言，国产青海湖（格尔木）结晶氯化钾居优势地位

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements