Antioxidant and antimicrobial activities of fresh garlic and aged garlic by-products extracted with different solvents

Food Science and Biotechnology - This study aims to investigate antioxidative and antibacterial properties of fresh garlic (non-aged, NG) and aged garlic (AG) by-products extracted with distilled...     

Development of an exercise program to prevent low back pain using an ergonomic approach

Recent statistic data shows that low back pain accounts for the largest percent of industrial injuries occurred by manual material handling tasks and has an increasing trend around the world. The objective of this study is to develop a prevention method for low back pain using electromyography that resists the strain on the L5/S1 disc and measures the heart rate for the prevention of low back pain during lifting tasks. EMG signals and heart rate were analysed under the condition of a fixed vertical factor (20~80 cm), two horizontal factors (35 cm, 55 cm), two weight factors (10 kg, 25 kg), and two times per minute for each lifting task. Eight healthy male workers performed nine-step strengthening & stretching exercises that can increase back strength on the L5/S1 disc for six months. After completion of the two trials, the results were compared.The results of this analysis show that EMG signals have more effect on the weight than the horizontal factors similar to those analysed in previous studies and are decreased. Therefore, those exercises were shown to be very efficient. Also, there are not statistically significant differences in the analysis results of heart rate between weight factors.The intention of this study is to suggest exercise programs that help to prevent low back pain by strengthening and stretching the muscles and joints related to lifting tasks at the work place. Furthermore, this study could help many industries by saving compensation costs and workers by maintaining their health.     

Development of the critical film thickness correlation for an advanced annular film mechanistic dryout model applicable to MARS code

It is generally assumed in the mechanistic film dryout model that the critical heat flux (CHF) arises when liquid film calculated from evaporation, droplet entrainment and deposition gets dryout. The dryout of film is usually assumed when film thickness becomes zero. However, it was indicated that the complete dryout assumption can estimate CHF well for uniform heating case but cannot simulate accurately for non-uniform heating case. The critical film thickness concept may be an appropriate approach physically because there is a possibility of instantaneous disappearance of liquid film when it gets very thin. Therefore, a critical dryout film thickness correlation was developed to properly model dryout phenomenon together with MARS code based on experimental data. The modified version of MARS implementing a newly developed critical dryout film thickness correlation was assessed using various dryout data including those of non-uniform heating case and flow reduction transient test. The prediction results showed improved agreement with the experimental data.     

活套多变量系统建模与智能解耦控制研究

活套系统控制的好坏,直接影响成品带钢的宽度、厚度等性能指标。活套系统的控制目标是恒定活套量下保持张力波动尽可能小,即降低活套张力控制和高度控制的相互干扰,使系统更加稳定。控制系统能够根据检测到的活套辊摆角的变化,一方面给出控制率去调整上游机架的轧辊速度以保持套量不变;另一方面在带钢轧制过程中,为了保持恒定带钢张力,活套输出的张力矩就必须随着活套角度的不同而相应地改变。针对活套系统非线性、强耦合、多约束等特点,以鞍钢1700热连轧精轧机组为背景,建立了活套系统的动态数学模型。针对该模型提出了一种新型控制策略--单神经元PID与小脑模型复合控制算法来实现活套系统的多变量解耦控制。仿真结果验证了本算法的有效性,其解耦响应速度和抗干扰能力明显优于传统PID解耦控制效果。     

Cost-Effective Caching for Mobility Support in IEEE 802.1X Frameworks

This paper is concerned with caching support of access points (APs) for fast handoff within IEEE 802.11 networks. A common flavor of current schemes is to let a mobile station preauthenticate or distribute the security context of the station proactively to neighboring APs. Each target AP caches the received context beforehand and can save itself backend-network authentication if the station reassociates. We present an approach to ameliorating cache effectiveness under the least recently used (LRU) replacement policy, additionally allowing for distinct cache miss penalty indicative of authentication delay. We leverage the widely used LRU caching techniques to effect a new model where high-penalty cache entries are prevented from being prematurely evicted under the conventional replacement policy so as to save frequent, expensive authentications with remote sites. This is accomplished by introducing software-generated reference requests that trigger cache hardware machinery in APs to refresh certain entries in an automated manner. Performance evaluations are conducted using simulation and analytical modeling. Performance results show that our approach, when compared with the base LRU scheme, reduces authentication delay by more than 51 percent and cache miss ratio by over 28 percent on average. Quantitative and qualitative discussions indicate that our approach is applicable in pragmatic settings     

Development of linked analysis system for PWR severe accidents utilizing RELAP5 and MAAP4

The purpose of this study is to develop a severe accident (SA) analysis method that is more reliable thorough transferring the physical status of the plant predicted by RELAP5 computer code to MAAP4 computer code. The methodology of the linkage analysis is developed and the criterion of linkage time is suggested to utilize the RELAP5 thermal–hydraulic calculation to the maximum degree possible and thereby guarantee the continuity of calculation for hydrogen generation. The MAAP4 calculations after data transfer show the physically proper results based on RELAP5 data. Comparison with other code results for TMI-2 accident reveals that the result from the RELAP5–MAAP4 linked analysis lay in the span given by a number of results of TMI calculation from other SA code systems. The results of this study are expected to improve the SA analysis methodology by analyzing an SA scenario with more reliable thermal–hydraulic initial conditions.     

疏可眠胶囊治疗失眠症(肝气郁结证)有效性和安全性的临床研究

目的 评价疏可眠胶囊治疗失眠症(肝气郁结证) 的有效性和安全性。 方法 采用分层分段随机、双盲、阳性药平行对照、多中心临床试验。选择失眠症(肝气郁结证) 患者440 例, 其中试验组330 例, 给予疏可眠胶囊每次4 粒, 每日2 次, 晚饭后及临睡前各服1 次;对照组完成110 例, 给予舒眠胶囊每次3粒, 每日2 次, 晚饭后及临睡均各服1 次。治疗2 周后, 评价有效性和安全性各种指标。 结果 用药2 周后对照组愈显率40.00 %(n=110), 试验组愈显率58.05 %(n=329), 试验组优于对照组(P <0.01),扣除中心效应结果相同。临床观察中未发现明显不良反应。 结论 疏可眠胶囊治疗失眠症(肝气郁结证), 安全有效。     

Numerical prediction of the fission product plate-out for a VHTR application

In order to identify and quantify the key parameters affecting the predictions of fission product transport and plate-out behavior in the coolant circuits of a very high temperature reactor (VHTR) system, systematic and intensive analyses were performed based on numerical predictions as well as the existing experimental data. For the purpose, the computational module for modeling fission product transport phenomena was developed and incorporated into the system analysis code, GAMMA+ for an integrated analysis. This integration can provide more realistic boundary conditions such as velocity, temperature, etc., during off-normal conditions as well as normal operations in a given VHTR system.     

元胡止痛栓镇痛作用的实验研究

目的:探讨元胡止痛栓的镇痛作用。方法:使用小鼠热板法、大鼠甲醛法, 并分别建立小鼠、大鼠痛经模型, 直肠给予不同剂量元胡止痛栓, 观察对动物的镇痛作用。取雌性大鼠离体子宫, 分别于浴槽中加入不同剂量的元胡止痛栓原料药, 观察对大鼠离体子宫收缩频率、幅度、活动力的影响。结果:元胡止痛栓能提高小鼠热板法、大鼠甲醛法动物的痛阈;延长小鼠、大鼠痛经模型的扭体潜伏期、降低扭体次数及扭体发生率;对大鼠离体子宫自发活动的幅度降低较小, 可减少自发活动的频率及降低活动力, 对催产素所致离体子宫平滑肌收缩的频率减少较小, 但降低收缩幅度, 减弱离体子宫平滑肌的活动力较为显著。结论:元胡止痛栓具有较好的镇痛作用, 并能对抗催产素所致离体子宫平滑肌的收缩作用。     

A comparison of dry and wet aging on physicochemical and sensory characteristics of pork loin with two aging times

This study investigated the effects of aging methods (wet aging and dry aging) and aging times (7 and 14 days) on the physicochemical and sensory characteristics of meat quality using pork loin. Dry-aged loin (DA) had significantly lower moisture content and higher crude fat protein content than wet-aged loin (WA). The pH of DA was significantly higher than that of WA and it increased with the aging time. DA showed lower cooking loss and higher aging loss than WA (p?<?0.001). Lipid oxidation and metmyoglobin content of DA were higher than those of WA (p?<?0.001). Shear force in DA was lower than that in WA (p?<?0.001) and myofibril protein index (MFI) increased in DA. In addition, DA recorded higher scores of roast color, flavor and overall acceptability compared to WA. These results suggested that the application of dry-aging on pork improved physicochemical, textural and sensory characteristics.