基于多Sink的长链状无线传感器网络功率控制算法

长链状无线传感器网络常用于矿井、隧道等特殊场景,传统的无线传感器网络由于只有一个Sink,应用在长链状无线传感器网络中容易造成Sink周围区域出现"热区"现象,影响网络整体生存期,为了解决上述问题,降低长链状无线传感器网络的整体能耗,延长网络生存期,提出一种多Sink分布式功率控制算法,该算法引入多Sink的网络结构,同时采用非均匀成簇的思想,将多Sink网络结构和分簇的Voronoi scoping路由算法进行结合,为每个Sink分配最优的通信半径和发射功率,将各Sink作为簇头,对网络进行分簇,从而在保证网络覆盖率的前提下,优化网络拓扑,仿真结果表明,该算法在连通度、能耗有效性、分簇干扰和网络性能上具有优势,可以有效的降低网络整体能耗、延长网络生存期。

基于长链状传感网的智慧路灯控制系统

为了满足路灯控制网络中可靠性和实时性要求,提出一种基于长链状传感网的智慧路灯控制系统。通过分析路灯控制的业务需求,利用时间同步技术和可变半径动态路由方法,解决了网络内通信冲突和通信可靠性易受环境干扰的问题。在此基础上,进行了路灯控制器的硬件设计和软件设计。对实际的道路环境进行测试的结果表明,系统较现有的电力线载波控制系统和Zig Bee控制系统在响应时间和稳定性两方面有很大提高,对以后的路灯控制系统,尤其是采用太阳能和风能等新一代能源路灯控制系统有很大的实际应用价值。

新型二肽类长链状化合物的分子动力学和量子化学研究

用分子动力学方法对5种新型肽类长链状化合物进行了构象研究,所得结果证明我们的构象搜索方法有效.分子L_3内的芳环堆积作用使整个分子具有特殊结构,这种结构特征可能使其具有特殊生物功能,该结果为药物分子设计提供了有用的信息.量子化学计算表明分子内形成的负电荷空穴,将使其易与受体结合.

基于路由半径自适应的长链状无线传感网络协议

长链状无线传感网络的节点呈长链状分布。这种特殊的拓扑结构将导致数据碰撞概率增大、传输时延增加,且越靠近Sink节点的地方该现象越明显,这将影响Sink节点的数据接收,甚至导致整个网络的崩溃。针对长链状无线传感网络的链路特征,提出了基于最大传输距离的路由半径自适应调节策略RAMD(Route-radius Adaptive with Max Transmission Distance)。该协议通过以PRR(Packet Receive Rate)及RSSI(Received Signal Strength Indication)相结合的链路质量评估方法自适应调节路由半径,设计基于分级同步的冲突避免机制及基于最优传输距离的自适应路由调整策略。通过与典型的分层路由和顺序传输路由的性能对比的仿真,以及对200个节点的长链状无线网络的物理平台的搭建及测试表明,RAMD协议对简化路由选择、降低时延和减少数据冲突有显著的作用。

基于蚁群算法的长链状无线传感网络路由算法

针对输电线路监测系统对无线传感器网络实时性和可靠性要求较高的特点,提出了一种用于线路监测传感网络的带信息素负增长的蚁群算法。该算法中不需要网络节点维护全局信息,但需要赋予唯一的编号。启发函数计及了链路的时延、收包率和距离汇聚节点的跳数,并经过试验增加了以参数α的不同选取可以调整跳数在整个选择过程中所占的重要程度。算法还为当前不可行和拥塞节点设置定时器,超时后可重新参与路由选择。仿真结果表明,相比基本蚁群算法,该算法能够找到具有更好性能的路由。

杀虫素48B的发酵、分离及性质初步研究

杀虫素48B是从黑微紫链霉菌浅色变种发酵液菌丝体中分离出来的一种杀虫活性物质,经过对其理化性质的测定及UV,IR,EI MS,1H NMR,13C NMR等光谱分析,初步推测为一种长链状不饱和脂类化合物,是一种结构新颖的杀虫抗生素.

基于博弈论的输电线路监测系统无线传感器网络数据转发模型

针对输电线路监测系统对无线传感器网络实时性和可靠性要求较高的特点,并为提高输电线路监测无线传感器网络的智能性,将博弈框架引入到无线传感器网络的数据转发过程,提出了一种长链状无线传感网络博弈转发模型(chain-sensor game algorithm model),并对其纳什均衡的存在性进行了证明。依据仿真实验结果,该模型能够对输电线路监测无线传感器网络数据转发过程的拥塞以及"漏斗效应"等问题优化改善。

Statistical Thermodynamic Properties of Linear Protein Solutions

The thermodynamic properties of linear protein solutions are discussed by a statistical me-chanics theory with a lattice model. The numerical results show that the Gibbs function of the solution decreases, and the protein chemical potential is enhanced with increase of the protein concentration for dilute solutions. The influences of chain length and temperature on the Gibbs function of the solution as well as the protein chemical potential are analyzed.As an application of the theory, the chemical potentials of some mutants of type I antifreeze proteins are computed and discussed.

Extension of Tao-Mason Equation of State to Heavy n-Alkanes

In our previous paper we extended the Tao and Mason equation of state (TM EOS) to refrigerant fluids, using the speed of sound data. This is a continuation for evaluating TM EOS in predicting PVT properties of heavy n-alkanes. Liquid density of long-chain n-alkane systems from C 9 to C 20 have been calculated using an analytical equation of state based on the statistical-mechanical perturbation theory. The second virial coefficients of these n-alkanes are scarce and there is no accurate potential energy function for their theoretical calculation. In this work the second virial coefficients are calculated using a corresponding state correlation based on surface tension and liquid density at the freezing point. The deviation of calculated densities of these alkanes is within 0.5% from experimental data. The densities of n-alkanes obtained from the TM EOS are compared with those calculated from Ihm-Song-Mason equation of state and the corresponding-states liquid densities (COSTALD). Our results are in favor of the preference of the TM EOS over other two equations of state.

Troubleshooting and Optimization of High-Strength Inhibitory Chemical Wastewater Treatment Process

Wastewaters from the chemical industry are usually of high-strength and may contain minor inhibitory and recalcitrant organics that are at times not readily identifiable. This paper describes the experience of a biological waste water treatment plant （WWTP） processing a COD concentration of 43000 mg·L^-1 wastewater from an oxochemical manufacturing plant. Stage improvements of the plant process by dilution of the inhibitory influent using other chemical wastewater streams resulting in a synergistic process effect, and removal of inhibitory organics by phase separation via acidification, effectively achieved process optimization producing a high quality effluent. In particular, the COD removal efficiency of granular sludge based anaerobic reactors increased from 56% to 90%. The final effluent COD decreased from 250mg·L^-1 to 50mg·L^-1, consistently meeting the COD concentration of 100 mg·L^-1 regulatory discharge limit. The success of the process enhancements supports the hypothesis that long-chain quaternary carboxylic acids act as substrate inhibitors in the biological process.

Single nucleotide polymorphisms in intron 1 and intron 2 of Larimichthys crocea growth hormone gene are correlated with growth traits

The growth hormone gene (GH) affects animal growth and is a potential target for genetic studies of variation related to growth traits. In this study, we analyzed single nucleotide polymorphisms (SNPs) in GH intron regions and their associations with growth traits in large yellow croaker, Larimichthys crocea, from Zhejiang and Fujian stocks. The results of PCR-single strand conformation polymorphism showed two haplotypes of intron 1, named AA and AB genotypes, in Zhejiang stock. AB exhibited an SNP at position 196 (G A) that was negatively correlated with body height and positively correlated with standard length/body height (P 0.05). Two different genotypes, CC and CD, were identified in intron 2 in Fujian stock, with CD showing an SNP at position 692 (T C). The CD genotype had a significantly positive correlation with both weight and total length (P 0.01). These basic data highlight the potential for using GH as a genetic marker of fish growth in marker assisted selection.