A heuristic for dynamic yard crane deployment in a container terminal

Rubber Tired Gantry Cranes (RTGCs) are the most widely used pieces of equipment in the Hong Kong sea-freight container yards. Workload distribution in the yard changes continuously over time. The dynamic deployment of RTGCs is an important issue in yard operation management. This paper investigates the dynamic crane deployment problem with the objective of determining the crane deployment frequency and routes over a planning horizon to minimize the total workload overflow. The problem is formulated as a mixed integer programming model. A heuristic algorithm is then developed to solve problems of practical sizes. The heuristic quickly finds a near optimal solution for crane deployment operation.     

Family burden following traumatic brain injury.

Investigated burden experienced by 60 spouses and 71 parents who served as primary caregivers to individuals with traumatic brain injury (BI). Burden levels, as assessed by the Questionnaire on Resources and Stress (QRS-SF), were compared for spouses and parents. Both parents and spouses exhibited high levels of burden. Relative to spouses, parents reported significantly greater burden related to lifespan care. Spouses reported significantly less personal reward than did parents. The presence of social aggression and cognitive disability in the individual with BI was found to have a greater association with subjective burden of caregivers than was the presence of physical disability or injury severity. Results of previous studies with QRS-SF scores show that the responsibility assumed by spouses and parents of persons with BI was as great as that experienced by families of people with severe chronic physical disabilities. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Electric and mechanical performances of Bi0.5Sb1.5Te3 prepared by spark plasma sintering

Thermoelectric (TE) materials are a kind of functional materials which can be used to convert directly heat energy to electricity or reversely.The thermoelectric effects hold great potential for application in power generation and refrigeration.Bi2Te3 and its alloys are well known as best TE materials currently available near room temperature.This paper studies respectively the effects of spark plasma sintering (SPS) on electric performance of Bi0.5Sb1.5Te3 thermoelectric materials that are prepared through vacuum melting and ball milling.Through X-ray Diffraction and cold field emission scanning electric microscope s4800, the phase constituent and microstructure of the TE materials samples were analyzed.Electric conductivity and power factor can be improved with the rise of Spark Plasma Sintering temperature (from 300 to 500 ℃) and pressure(from 30 to 60 MPa), and the density and mechanical strength of Bi0.5Sb1.5Te3 thermoelectric material increase, too.     

耐高温水蒸汽氟橡胶的研究

对四氟化乙丙橡胶（ＴＰ－２）和氟橡胶（ＦＫＭ－２４６Ｇ）进行了耐２８０℃水蒸汽试验。结果表明：以过氧化二异丙－三烯丙基异氰脲酸酯为硫化体系的ＴＰ－２硫化胶的耐高温水蒸汽性能，明显优于以Ｎ，Ｎ＇－双肉桂叉－１，６－己二胺为硫化体系的ＦＫＭ－２４６Ｇ硫化胶和以过氧化苯甲酰为硫化体系的ＦＫＭ－２４６Ｇ硫化胶。     

高速重轨矫正圈用9Cr2MoRE钢的开发研究

通过添加不同含量的稀土元素,对比研究稀土含量对9Cr2Mo钢奥氏体晶粒度、相变点、抗拉强度及耐磨性的影响。研究结果表明,稀土元素可以有效细化9Cr2Mo钢的奥氏体晶粒,当稀土加入量为0.10%时,晶粒长大速率降低最明显。添加质量分数为0.1%的稀土后,9Cr2Mo钢的抗拉强度明显提高,塑性和延展性也有所改善。加入稀土元素后,9Cr2Mo钢在磨损过程中可以避免出现大块疲劳剥落现象,提高了耐磨性。     

Numerical aspects of a Godunov-type stabilization scheme for the Boltzmann transport equation

Journal of Computational Electronics - We discuss the numerical aspects of the Boltzmann transport equation (BE) for electrons in semiconductor devices, which is stabilized by Godunov’s...     

Identification of the female-produced sex pheromone of the scarab beetle,Hoplia equina

Hoplia equina LeConte (Coleoptera: Scarabaeidae: Melolonthinae) is a beetle pest of cranberry beds in Massachusetts. Larvae feed on the roots of the cranberry plant, reducing yield as well as vine density. The female sex pheromone was identified as 2-tetradecanone. There were eight compounds found in the airborne volatiles collected from females that elicited antennal responses from males. Of the eight compounds tested (nonanal, decanal, dodecanal, 2-dodecanone, 2-tridecanone, 2-tetradecanone, 2-pentadecanone, and 2-hexadecanone), 2-tetradecanone was the only one that attracted male beetles in the field. Combining any of the other seven antennally active compounds with 2-tetradecanone did not increase male capture.     

N,N,N'''',N''''-四丁基-3-氧-戊二酰胺辐解机理的研究

计算了N，N，N’，N’-四丁基-3-氧-戊二酰胺（N，N，N’，N’-tetrabutyl-3-oxa-pentanediamide，TBOPDA）中各个原子的电荷分布，根据电荷分布情况讨论了TBOPDA中有关化学键的相对稳定性和可能断裂几率，认为TBOPDA中化学键的辐照稳定程度为C-O〈C-H〈C-N〈C-C。理论推测的结果与相关辐解产物的产额顺序基本一致。