Effect of storage temperature on phenolics stability in hawthorn (Crataegus pinnatifida var. major) fruits and a hawthorn drink

The stability of five major phenolics, namely (−)-epicatechin (EC), procyanidin B₂ (PC-B₂), chlorogenic acid (ChA), hyperoside (HP) and isoquercitrin (IQ), in hawthorn fruits and a canned hawthorn drink were evaluated during 6 months of storage in the dark at three different temperatures (4, 23 and 40 °C). HPLC with a diode-array detector was used to determine the contents of the individual compounds. The results showed that the studied phenolics in the hawthorn fruits and the drink were both stable at 4 °C and relatively unstable at 23 and 40 °C with varied extents of degradation. At room temperature (23 °C), marked degradations of EC and PC-B₂ were observed in both the fruits and the drink with around 50% and 30% decrease after a 6-month storage, respectively. A more significant decrease of the phenolics was observed at 40 °C, especially for EC and PC-B₂, which were almost completely degraded after a 6-month storage. HP, IQ and ChA were relatively stable at 23 °C, but unstable at 40 °C. Therefore, low-temperature storage is recommended for maintaining the quality and efficacy of hawthorn fruits and its preparations.     

Study on phase behavior–impact strength relationship of unsaturated polyester/polyurethane hybrid polymer network

The phase behavior of a hybrid polymer network (HPN) composed of poly[(propylene glycol maleate)-co-(propylene glycol phthalate)] crosslinked with styrene and polyester–urethane crosslinked with methylene-bis-ortho-chloroaniline was examined. The correlation between phase separation and impact strength of the HPNs is discussed. The composition of HPNs has an effect on their properties.     

YL-1OO型自动加药装置在乙烯循环水场的应用

介绍了国产YL-100型自动加药装置功能及其在中国石化茂名石化乙烯工业公司乙烯循环水场的应用情况,结果表明其运行平稳,总磷测试数据可靠,可达到循环水自动加药控制的目的。     

Fishtail magnetization in single crystal Tl2Ba2CuO6

We report extensive magnetization measurements on single crystals of Tl₂Ba₂CuO₆ superconductors. The fishtail magnetization is found to disappear above a characteristic temperature (60 K), which corresponds to a crossover temperature in the temperature dependence of the irreversibility line. Since the low temperature irreversibility field can be modeled by a Josephson coupled layered system, we propose that the fishtail magnetization in the Tl₂Ba₂CuO₆ system is due to dimensional crossover.     

移动无线传感网络节点协同避障的改进方法

传统蜂拥控制模型在协同避障跟踪方面,目前有Reynolds和Tanner的蜂拥模型。笔者曾对其做出了改进,提出了与Steer to Avoid法则相结合的避障模型,该模型在跟踪过程中对凸形障碍有较高的避障效率。由于在Steer to Avoid的方向判断中,目标对节点具有引力,使节点群陷入凹形区域无法绕出。将协同避障模型引入凹形障碍环境中,对模型进一步改进,在Steer to Avoid转向判断时暂时取消目标对节点群的引力,让节点群在进入凹形后自行做出环境的判断并沿着障碍边缘不断搜索路径,最终绕出障碍到达目标。仿真实验结果表明：与传统两个模型相比,该模型在避障的平均速率和时间效率上有显著提高,适用于避开未知的凹形障碍。     

基于自适应模糊控制器的氧枪冷却水系统

针对炼钢厂水站系统中的氧枪枪位控制，设计了一种自适应模糊控制器。根据控制器输出误差在线调整参数，并按照氧枪枪位随流量变化的规律进行连续调节，给出相应的自适应算法。以实时修正模糊规则。从而确定了每一炉各个阶段氧枪的基本枪位，改变了原系统水泵长期伞速运行造成严重能耗损失的状况。仿真结果表明：自适应模糊控制器能适应流量的变化，使氧枪枪位在整个炉役期都能处于最优的位置，改善了系统性能。     

A distributed deadlock detection algorithm for mobile computing system

The mode of mobile computing originated from distributed computing and it has the un-idempotent operation property, therefore the deadlock detection algorithm designed for mobile computing systems will face challenges with regard to correctness and high efficiency. This paper attempts a fundamental study of deadlock detection for the AND model of mobile computing systems. First, the existing deadlock detection algorithms for distributed systems are classified into the resource node dependent （ RD ） and the resource node independent （RI） categories, and their corresponding weaknesses are discussed. Afterwards a new RI algorithm based on the AND model of mobile computing system is presented. The novelties of our algorithm are that： 1 ） the blocked nodes inform their predecessors and successors simultaneously; 2） the detection messages （agents） hold the predecessors information of their originator; 3 ） no agent is stored midway. Additionally, the quit-inform scheme is introduced to treat the excessive victim quitting problem raised by the overlapped cycles. By these methods the proposed algorithm can detect a cycle of size n within n - 2 steps and with （ n^2- n - 2 ）/2 agents. The performance of our algorithm is compared with the most competitive RD and RI algorithms for distributed systems on a mobile agent simulation platform. Experiment results point out that our algorithm outperforms the two algorithms under the vast majority of resource configurations and concurrent workloads. The correctness of the proposed algorithm is formally proven by the invariant verification technique.     

论高等院校改革的机遇和创造性工作

目前,山东纺织工学院正在教育改革与开放的指引下迅速发展。学院科研新立项28个;已获科研经费104.6万元;在美国匹兹堡国际博览会上,我院教师获银牌奖;许多重大科研项目转化为生产力;获国家自然科学基金项目三项;教师队伍结构迅速优化以及校办产业的迅猛发展都为学院发展展示了良好的前景。抓住机遇,深化改革和创造性工作是高校今后工作的关键。文章用现代管理学的观点从不同角度论述了高校发展的关键问题,立题新颖,颇有新意。