基于最优簇头数的环形无线传感器网络分簇算法

基于无线传感器网络中每个环能量消耗最小原则, 提出一种基于最优簇头数的环形无线传感器网络分簇算法. 首先计算出网络中每个环的最优簇头数, 然后在最优簇头数的基础上, 将网络划分为若干不同大小的簇, 最后在选择簇头时, 考虑了每个环的最优簇头数与相应环中节点数目的比值、 节点的剩余能量以及簇成员节点到簇头节点的最短距离与簇头节点到基站距离的关系. 解决了无线传感器网络簇内节点通信能量消耗过多的问题, 均衡了网络节点的能耗. 仿真结果表明, 该算法提高了网络能效和扩展性, 平衡了网络能耗, 延长了网络的生命周期.     

犯罪现场毛纤维碱催化裂解气相色谱分析

提供了一种碱催化进样方式,利用裂解气相色谱对毛纤维进行鉴别的方法。选用HP-6890气相色谱仪,配以CZ-100裂解器和FID检测器,对碱(催化剂)的种类和浓度、气相色谱条件以及裂解条件三方面进行了优化选择,确定了最佳分析条件,并在此基础上对不同牌号的93种(4种颜色)毛纤维进行了分析(以毛纤维裂解色谱图中强吸收峰的保留时间、对应峰面积比值的差异进行鉴别)。此方法灵敏、可靠、便于操作,为刑事案件中同类毛纤维的鉴定提供了一种切实可行的方法。     

Molecular solution to the optimal linear arrangement problem based on DNA computation

Due to massive parallelism, enormous memory storage and very low energy consumption, biomolecular operations have been suggested to solve various NP-hard problems that are beyond the capability of the fastest known digital computer. The optimal linear arrangement (OLA) problem is a well-known NP-hard combinatorial optimization problem. Based on a DNA computational model, this paper describes a novel algorithm for the OLA problem, which is executed in O(n ³log₂ n) DNA operations on tubes of (nK + n + m + L + 1)-bits DNA strands, where and . With the advance in molecular biology techniques, this algorithm may be of practical utility.     

A fast,sensitive, and high‐throughput method for the simultaneous quantitation of three ellagitannins from Euphorbiae pekinensis Radix in rat plasma by ultra‐HPLC–MS/MS

A fast, sensitive, and high‐throughput ultra‐HPLC–MS/MS method has been developed and validated for the simultaneous determination of three main active constituents of Euphorbiae pekinensis Radix in rat plasma. After addition of the internal standard, plasma samples were extracted by liquid–liquid extraction with ethyl acetate/isopropanol (1:1, v/v) and separated on a CAPCELL PAK C₁₈ column (100 × 2.0 mm, 2 μm, Shiseido, Japan), using a gradient mobile phase system of methanol/water. The detection of the analytes was performed on a 4000Q UHPLC–MS/MS system with turbo ion spray source in the negative ion and multiple reaction‐monitoring mode. The linear range was 1.0–1000 ng/mL for 3,3′‐di‐O‐methyl ellagic acid‐4′‐O‐β‐d ‐glucopyranoside (i), 1.5–1500 ng/mL for 3,3′‐di‐O‐methyl ellagic acid‐4′‐O‐β‐d ‐xylopyranoside (ii), and 5.0–5000 ng/mL for 3,3′‐di‐O‐methyl ellagic acid (iii). The intra‐ and interday precision and accuracy of all the analytes were within 15%. The extraction recoveries of the three analytes and internal standard from plasma were all more than 80%. The validated method was first successfully applied to the evaluation of pharmacokinetic parameters of compounds 1 , 2 , and 3 in rat plasma after intragastric administration of the Euphorbiae pekinensis Radix extract.     

Colloidal nanoparticles of a europium complex with enhanced luminescent properties

We report an alternative approach, that is, forming Eu(tta)3dpbt (dpbt = 2-( N, N-diethylanilin-4-yl)-4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine, tta = thenoyltrifluoroacetonato) nanoparticles in water/methanol mixtures, to satisfy the combined requirements of good dispersibility in water solutions and efficient long-wavelength sensitization for Eu (III) complexes to be used in biological applications. The size of Eu(tta)3dpbt colloidal particles with very high luminescent capabilities can be modulated to some extent by changing the preparation conditions. The optical excitation window for the Eu (III) luminescence of Eu(tta)3dpbt nanoparticles, extending up to 475 nm, is wider than that of Eu(tta)3dpbt molecules dissolved in toluene. This is the first example for obviously extending the sensitization window of luminescent lanthanide materials to the long-wavelength region by forming nanoparticles of a lanthanide complex. Quantum yields of Eu (III) luminescence of the prepared Eu(tta)3dpbt colloidal particles, with an average diameter of 33.1 nm, are 0.27, 0.27, 0.24, 0.19, 0.14, and 0.01 upon excitation at 402, 420, 430, 440, 450, and 475 nm, respectively. The Eu(tta)3dpbt nanoparticles exhibited excellent two-photon sensitization performance with a highest delta Phi value of 3.2 x 10(5) GM (1 GM = 10(-50) cm4 s photo(-1) particle(-1)) at the excitation wavelength of 832 nm, which is about 7 times higher than the highest value reported for the CdSe/ZnS core-shell quantum dots. The favorable luminescent properties and the good dispersibility in water solutions of the Eu(tta)3dpbt nanoparticles are very promising for the development of new luminescent nanoprobes for bioanalysis.     

SS7业务平台中基于全局控制表的消息处理方法

提出了ＳＳ７业务平台中基于全局控制表的消息处理机制，给出了全局控制表的概念和方法。利用全局控制表可提高消息处理效率，并用来收集有关状态信息，便于实现消息的流量控制。文中还对消息在模块间传递机制以及不同主机上的模块间通信机制作了探讨。     

乌鳢Ophicephalus argus Cantor和月鳢Channa asiatica(Linnaeus)骨骼系统的比较研究

本文比较了乌鳢和月鳢的骨骼特征。通过对两种标本的X射线摄影研究,乌鳢具有发育完好的腰带与腹鳍,而月鳢既无腰带也无腹鳍的痕迹,在脊柱和肋骨的形态及数目上也明显不同。对头骨和肩带的整体以及分离骨片所作的解剖观察表明,无论在外形上,犬牙分布上以及许多分离骨片的形态上,都有重要的差异。鳢类各个种通常都是根据鳞片、鳍条以及斑纹等特征来分类的,属的划分主要是根据腹鳍的有无。究竟为两属或为一属,学者意见尚不一致。通过对骨骼系统的研究,乌鳢和月鳢具有许多重要的差异,把它们作为一个属是否合适,值得商榷。     

新型电力系统下综合电动汽车充电站的优化运行

构建以新能源为主体、用电负荷多元化发展的新型电力系统是实现中国双碳目标的重要途径.源与荷双重不确定性的考验,对电力系统调控平衡能力及运行调度方式提出了更高的要求.本文提出一个集成了插电式电动汽车(Plug-in Electric Vehicles,PEV)、新能源发电、固定储能,并与商业建筑物相结合的双向综合电动汽车充电站(Integrated Electric Ve?hicle Charging Station,IEVCS),建立了一个考虑其时间特性及协同互动的四阶段智能优化控制算法.目标在于最大程度地降低考虑了用户满意度及潜在不确定性的IEVCS运行成本,同时通过调整PEV充放电、电池储能充放电、电网供给电量、可调整负荷等的优化调度来保障实时供需平衡.文中分析了该算法每个阶段的作用,并验证了每个阶段在应对源荷不确定性状况时为电力供给提供更多弹性及冗余度的必要性.     

拟正则图的最大边边连通度

定义了图的边边连通度，设计了一类具有最大边边连通度的拟正则图。     

A rapidly self-healing supramolecular polymer hydrogel

Self-healing is the ability of materials to recover their original shape and repair damage after being internally or externally damaged.In nature,some biomaterials,such as skin tissue and tendons,are capable of healing damage autonomously.Inspired by nature,several approaches have been