洛阳智慧交通系统的地址匹配技术

根据洛阳市城市道路分布的实际情况,研究洛阳智慧交通系统的道路动态段技术、地址数据库结构和数据追加方法、地址数据库和道路数据库的匹配策略.     

Molecular recognition of a single sphingolipid species by a protein's transmembrane domain

Functioning and processing of membrane proteins critically depend on the way their transmembrane segments are embedded in the membrane. Sphingolipids are structural components of membranes and can also act as intracellular second messengers. Not much is known of sphingolipids binding to transmembrane domains (TMDs) of proteins within the hydrophobic bilayer, and how this could affect protein function. Here we show a direct and highly specific interaction of exclusively one sphingomyelin species, SM 18, with the TMD of the COPI machinery protein p24 (ref. 2). Strikingly, the interaction depends on both the headgroup and the backbone of the sphingolipid, and on a signature sequence (VXXTLXXIY) within the TMD. Molecular dynamics simulations show a close interaction of SM 18 with the TMD. We suggest a role of SM 18 in regulating the equilibrium between an inactive monomeric and an active oligomeric state of the p24 protein, which in turn regulates COPI-dependent transport. Bioinformatic analyses predict that the signature sequence represents a conserved sphingolipid-binding cavity in a variety of mammalian membrane proteins. Thus, in addition to a function as second messengers, sphingolipids can act as cofactors to regulate the function of transmembrane proteins. Our discovery of an unprecedented specificity of interaction of a TMD with an individual sphingolipid species adds to our understanding of why biological membranes are assembled from such a large variety of different lipids.     

厨房里的阿诗玛：彝族撒尼人食物体系的符号化表述

饮食在地理区位上的表述是＂菜系＂,而当以＂族群文化＂对饮食进行分类时,诸多的＂民族菜＂就已经端上了人类学家的＂餐桌＂。在文化旅游的背景下,为吸引游客进行＂舌尖上的探访＂,＂民族风味＂在原生状态的味觉传承中,又加入了＂文化想象＂的符号化流转,对饮食进行着符号化的表述与传播。文章以彝族撒尼人食物体系的符号化表述为个案,观察＂阿诗玛文化＂是如何在＂厨房＂与＂餐桌＂之间刻写食物的故事,呈现那个＂厨房里的阿诗玛＂。     

微重力状态下细水雾雾场特性仿真

针对细水雾灭火在载人航天器安全中的应用,采用计算流体动力学（CFD）的方法进行了研究.在建立压力旋流喷嘴液膜式雾化模型及微重力场雾滴运动轨迹模型的基础上,利用计算流体动力学仿真软件FLUENT中的离散相模型（DPM）分析了微重力状态下细水雾雾场特性,包括微重力下细水雾的雾化图形、速度以及雾粒直径分布.仿真结果表明：微重...     

ICU病人褥疮的预防和护理

褥疮是临床常见的并发症之一,因ICU病人大多为长期卧床病人,患病率更高。文章通过对文献资料和临床实践的分析,对褥疮的预防与护理进行综述,并提出提高ICU病人褥疮的预防与护理水平的方法。     

卧式螺旋管内油—气—水三相流流型的实验研究

在２种不同尺寸的卧式螺旋管上进行了油－气－水三相流流型的实验研究，得到了流型图，对各种流型之间的转变机理进行了讨论和分析，同时给出了各流型之间转变的准则关系式     

量子力学中力学量的平均值

提出了量子力学中力学量平均值的重要性，给出了计算力学量平均值的4种方法．     

Is the polydispersity exponent of the hyperbranched polymers the 3/2 or 5/2？

Dendrimers and hyperbranched polymers have re- ceived much attention in recent decade due to their novel physical and chemical properties, such as multi- ple end groups, high solubility, and reduced viscosities relative to their linear counterparts, and h…