Algorithm of graph isomorphism with threedimensional DNA graph structures

ResearchonDNAcomputingwasinitializedin1994 ,whenAdleman[1] proposedamethodofsolvingasmallinstanceoftheHamiltonianPathproblembyalaboratoryexperimentinvolvingDNAmolecules .Later,Lipton[2 ] demonstratedhowalargeclassofNP completeproblemscouldbesolvedbyencodingtheprobleminDNAmolecules .Inparticular ,LiptonshowedonefamousNP problem ,theso called“satisfiability”problem (SAT)andsubsequentlytheotherNP problemscouldbeencodedandsolvedusingmolecules .TheadvantagesofDNAcomputingareitsmassivepa…     

基于复杂系统硬件设计新方法的研究

在分析传统硬件设计方法所存在问题的基础上 ,介绍了硬件描述语言 ,给出了采用硬件描述语言设计复杂系统硬件电路的新方法 ,并指出了这种新方法所具备的优越性     

A multi-layer zone model for predicting temperature distribution in a fire room

Modelingoffireinacompartmentcanbeachievedeitherusingazonemodelingmethodoracomputationalfluiddynamics (CFD )modelingmethod .Themostcommonzonemodelisthetwo zonemodel.Themaincharacterofthismodelisthatitdividestheroom (s)intoahot ,upperlayerandacooler,lowerlayer ,andthatthephysicalpropertiesofeachlayer ,suchasitsgastemperatureandspeciesconcentrationsarealluniform .Somemodelsofthistypehavebeendeveloped[1～3] ,andacomprehensivereviewoftheexistingtwo zonefiremodelscanbefoundinreference [4 ].Thecomp…     

基于Grab Cut和区域生长的服装图像前景提取算法

针对(Crab Cut算法应用于服装检索系统中服装图像的前景提取时所存在的交互式和复杂背景提取效果差问题,首先提出了一种全自动化的Crab Cut算法,以实现自动根据背景情况,对单一背景和复杂背景图像分别采用不同的方法生成初始矩形框并进行前景提取由于该算法仍存在欠分割或过分割现象,故将该算法与区域生长算法相结合,给出了一种结合区域生长的全自动化Crab Cut算法实验结果表明,无论对于单一背景还是复杂背景的图像,改进算法的前景提取效果都明显优于传统算法,不仅能准确获取服装前景区域,而且对于服装内部的过分割问题也有很大的改善     

多重分形奇异谱的几何特性I.经典Renyi定义法

研究了经典多重分形理论中广义维数和奇异谱的几何特性 ,通过严格的数学推导证明了广义维数 Dq、质量指数 τ～ ( q)、奇异性指数 α～ ( q)和奇异谱 f～ ( α～ ( q) )的单调性和极限 ,并提出了判定合理奇异谱 f～ ( α～ ( q) )的准则。     

介孔TiO_2/珍珠岩催化剂的制备及可见光催化活性研究

为提高可见光在降解染料废水过程中的利用率,以珍珠岩为载体,制备了负载型介孔TiO2催化剂.分析了焙烧时间和负载次数对催化剂降解亚甲基蓝性能的影响及其动力学规律,并用SEM扫描电镜进行了形貌表征.研究结果表明:焙烧时间超过1.5 h时,催化剂活性随焙烧时间的增加而降低,在最佳焙烧时间1.5 h的条件下,可见光对亚甲基蓝的降解率达71.59%;多次负载有利于催化剂活性的提高,其中负载3次的降解效果最佳珍珠岩呈现出疏松多孔结构,珍珠岩负载1次的二氧化钛较少;负载3次的较多,分布比较均匀;负载5次的二氧化钛较集中,但不及负载3次的多.所制备的催化剂降解亚甲基蓝反应都符合一级或准一级动力学规律,其中焙烧时间为1.5 h及负载次数为3次时的一级反应速率常数分别达到最高.     

Evaluating the reliability of microsatellite genotyping from low-quality DNA templates with a polynomial distribution model

Molecular studies using trace DNA, such as from museum specimens, ancient or forensic samples and samples obtained noninvasively, often have a common problem of low quality of DNA templates. Amplification errors, such as allelic dropout and false allele, may arise during polymerase chain reaction (PCR) using such samples. A mathematical model which treats homozygotes and heterozygotes discriminately has been developed to measure sample quality and compute the confidence level of using multipletube approaches. We use plucked hair samples collected from 26 individual Sichuan snub-nosed monkeys (Rhinopithecus roxel- lana) to test the model. In this case, a confidence level of 99% can be achieved by three positive PCRs. If the sample quality is very poor and requires many PCR replicates, an alternative multiplestep genotyping method is recommended. This model enables researchers to optimize experimental protocols through pilot studies and obtain reliable genetic information using noninvasive sampling method.     

浅谈护理工作中的药学服务

根据医嘱用药是护理人员的主要工作之一,在药学理论飞速发展和药物快速更新换代的今天,更要增强护理人员的合理用药能力。本文综述了护理工作与药学服务的主要结合点,并从理论和实践上讨论了护理工作中审慎执行医嘱用药、合理使用新药、治疗药物监测、药物不良反应监测等方面的重要意义。     

Amplitudes, rates, periodicities and causes of temperature variations in the past 2485 years and future trends over the central-eastern Tibetan Plateau

Amplitudes, rates, periodicities, causes and future trends of temperature variations based on tree rings for the past 2485 years on the central-eastern Tibetan Plateau were analyzed. The results showed that extreme climatic events on the Plateau, such as the Medieval Warm Period, Little Ice Age and 20th Century Warming appeared synchronously with those in other places worldwide. The largest amplitude and rate of temperature change occurred during the Eastern Jin Event (343-425 AD), and not in the late 20th century. There were significant cycles of 1324 a, 800 a, 199 a, 110 a and 2-3 a in the 2485-year temperature series. The 1324 a, 800 a, 199 a and 110 a cycles are associated with solar activity, which greatly affects the Earth surface temperature. The long-term trends (>1000 a) of temperature were controlled by the millennium-scale cycle, and amplitudes were dominated by multi-century cycles. Moreover, cold intervals corresponded to sunspot minimums. The prediction indicated that the temperature will decrease in the future until to 2068 AD and then increase again.