一种新的混沌方程及其超混沌网络模型

考虑器件实现方面的简单性，提出一种新的混沌方程模型，并通过单向耦合法构成超混沌网络。通过微机模拟表明网络具有丰富的混沌、超混沌现象。进而在单向耦合法基础上，提出参数耦合法，利用此方法，构造成的二维混沌网络具有超混沌动力学特性。网络具有高效、灵活、易于器件实现的特点。这种新的混沌方程及超混沌网络模型可望在提高激光器的输出功率、保密通信等领域获得广泛应

基于词向量空间的大规模中文语义网络构建与复杂性分析

当前对于汉语语义层次的语言网络研究方法仅限于静态词典生成以及人工手动生成两种方法,具有很大的局限性。对此,该文从大规模语料库生成的语义空间出发,结合语义空间丰富的语义信息和义类词典资源,提出一种新颖的基于分布语义的语义网络构建策略,并在此基础上探究了由不同性质的语义空间所构建的语义网络的统计特性。相比前人的方法,该文提出的方法优势在于无需依赖人工标注,支持大规模动态语料的网络自动构建。实验结果表明,语义网络具有复杂网络两个典型的特性:小世界效应和无标度特性。此外,由于语义网络描述的是词之间最为本质的语义关系,与不同文体中的措辞、使用习惯、风格等不存在直接的关系,因此当语义网络节点到达一定规模时,语义网络的某些统计特性可能会趋于一致

Synthesis of Ru(dpp)_3(ClO_4)_2 doped polyacrylonitrile nanoparticles and its applications in ratiometric pH sensing

采用乳液聚合法制备了掺杂有4,7-二苯基-1,10-邻菲咯啉钌(ru(dPP)3(ClO4)2)的聚丙烯腈纳米颗粒(ru-PAn).经扫描电子显微镜(SEM)表征,制备的ru-PAn的尺寸为135±15 nM,呈规则球型,尺寸分布均匀且在水中的分散性较好.实验考察了氧气、共存离子和PH值对其荧光性质的影响以及其荧光稳定性.以异硫氰根荧光素(fITC)为PH荧光指示剂、ru-PAn为参比信号,初步建立了一种比率荧光PH检测的方法.In this paper Ru(dpp)3(ClO4)2 doped polyacrylonitrile nanoparticles(Ru-PAN) were prepared using emulsion polymerization method.Morphology characterizations of the nanoparticles were performed using scanning electron microscope,the particle diameter was about 135±15 nm.The interference of the oxygen,coexisting ions,pH and photo-stability were investigated.A new ratiometric fluorescence pH sensing system was established via fluorescein isothiocyanate(FITC) as pH-sensitive dye and Ru-PAN as a reference.国家自然科学基金资助项目(20975085

茵陈蒿汤抗游离脂肪酸对HepG2细胞脂毒性作用的效应中药研究

目的:探讨对游离脂肪酸(FFA)诱导人肝癌细胞株(HepG2)细胞脂肪沉积和对肿瘤坏死因子(TNF-α)分泌有显著抑制作用的茵陈蒿汤的效应中药或组合。方法:采用FFA诱导HepG2细胞脂肪沉积和TNF-α分泌的体外细胞模型和药物血清技术,运用数学模型"均匀设计法",根据复方中的3味中药(茵陈、栀子、大黄),选用U7(76)表进行组方设计所得6种中药组合进行干预,以对甘油三酯(TG)及TNF-α的抑制效应作为考察指标,筛选效应中药或组合,并重新区间分组验证。结果:茵陈和栀子在高剂量组合时有显著降低细胞TG及TNF-α含量的效应,与全方无显著性差异,其中单一茵陈也可显著降低细胞TG及TNF-α含量。结论:茵陈及其与栀子的组合是茵陈蒿汤抑制FFA诱导HepG2细胞脂肪沉积和TNF-α分泌作用的效应中药

基于均匀设计的祛湿化瘀复方抗脂毒性作用的主效应中药分析

目的观察祛湿化瘀复方的主效应中药或不同组合对游离脂肪酸(free fatty acid,FFA)诱导人肝癌细胞株(HepG2)细胞脂肪沉积和肿瘤坏死因子α(turmor necrosis factor α,TNF-α)分泌的作用,探索中药复方药理作用相应物质基础的分析方法。方法采用FFA诱导HepG2细胞脂肪沉积和TNF-α分泌的体外细胞模型和药物血清技术,运用数学模型"均匀设计法",根据复方中的5味中药(茵陈、栀子、虎杖、田基黄、姜黄),选用U11(1110)表进行组方设计所得10种中药组合进行干预,以对甘油三酯(triglyceride,TG)及TNF-α的抑制效应作为考察指标,筛选主效应中药或组合,并重新区间分组验证。结果茵陈和田基黄在高剂量组合时有显著降低细胞TG及TNF-α含量的效应,与全方比较差异无统计学意义,其中单用茵陈也可显著降低细胞TG及TNF-α含量。结论茵陈及其与田基黄的组合是祛湿化瘀复方抑制FFA诱导HepG2细胞脂肪沉积和TNF-α分泌作用的主效应中药;应用均匀设计与药效学分析的方法可有效分析中药复方针对某一作用环节的主效应中药或组合

Diatom diet selectivity by early post-larval abalone Haliotis diversicolor supertexta under hatchery conditions

Benthic diatoms constitute the primary diet of abalone during their early stages of development.To evaluate the dietary preferences of early post-larval abalone,Haliotis diversicolor supertexta,we analyzed the gut contents of post-larvae that settled on diatom films.We compared the abundance and species diversity of diatom assemblages in the gut to those of the epiphytic diatom assemblages on the attachment films,and identified 40 benthic diatom species in the gut contents of post-larvae 12 to 24 d after settlement.The most abundant taxa in the gut contents were Navicula spp.,Amphora copulate,and Amphora coffeaeformis.Navicula spp.accounted for 64.0% of the cell density.In the attachment films,we identified 110 diatom species belonging to 38 genera.Pennate diatoms were the dominant members including the species Amphiprora alata,Cocconeis placentula var.euglypta,Cylindrotheca closterium,Navicula sp.2,and A.coffeaeformis.Nano-diatoms(<20 μm in length) accounted for a considerable proportion of the total species..

一种聚变反应堆装置的新概念

本文提出了一个聚变反应堆装置的新概念,它由两个轴对称的类似串联磁镜的部分和两个螺旋仿星器U形弯曲段组成,并综合了直管和环形、快过程和慢过程的优点。文中研究了起动、过渡和运行阶段,讨论了D-D反应堆参数和稳定性。射频和高能分量只在起动阶段才需要,在整个过程中只有瞬时的能量消耗。端塞也只须在起动阶段存在,这大大降低了工程技术要求

THE INVESTIGATION OF EXPERIMENTAL TECHNIQUE FOR HIGH TEMPERATURE GAS JET FLOW TEST IN IMPULSE WIND TUNNEL

报道关于高温燃气自由喷流(热喷流)、燃气喷流/主流干扰流对气动热环境影响的实验研究结果.其意义在于:抽象出高超声速飞行器实际飞行时燃气喷流及其干扰流的物理模型,为高超声速飞行器防热需求提供实验依据.实验主流由脉冲风洞提供,燃气喷流用氢氧燃烧驱动路德维希管的方式产生.利用脉冲风洞驱动段压力信号自动控制热气源的产生以保证风洞主流与燃气喷流同步,利用氢气、氮气和氧气的不同比例实现燃气喷流的热力学相似.实验技术上完成了高温燃气喷流系统的参数采集与系统状态标定;实验内容上开展了压缩拐角平板模型的气动热实验研究,通过实验比较了只有主流流场、只有热喷流流场和既有主流流场又有热喷流流场(即干扰流场)3种工况的热流分布.实验研究发现,热喷流/主流相互干扰会对压缩拐角平板上某一范围内的气动热环境造成显著影响,热流峰值较无喷流流场高出一个量级.Abstract：This is the first report on the experimental result about the aerothermal environment of High Temperature Jet Flow (HTJF) and its interaction flow. The significance of this experiment is to abstract the physical mode from the real flight of hypersonic aircraft in order to provide experimental evidence for the thermal protection requirements. This experiment used the compression corner as the research object to research the aerothermal environment influenced by the HTJF and the interaction flow by the HTJF combine with the main flow filed. In this paper, the main flow came from the impulse wind tunnel; the HTJF came from the high enthalpy gas supply platform, which used the ox-hydrogen burner to drive the Ludwieg Tube. This paper used the pressure change of the driven section in the impulse wind tunnel to control the producing of the HTJF in order to assure the synchronous operation of the two parts of flow. This paper will present the research about: 1. To standardize the thermodynamic state of the HTJF; 2. The experimental research of the compress corner which include three experimental status: 1)the aerothermal environment in the main flow without the HTJF; 2) the aerothermal environment in the high temperature jet flow without the main flow; 3) the aerothermal environment in both the high temperature jet flow and the main flow. It is found from the experiment that the aerothermal environment of the part of the compress corner has great influenced by the high temperature gas flow. The high temperature gas jet flow can cause the heat flux peak an order of magnitude than the heat flux peak without it

Fabrication and Application of Low-cost Microfluidic Analytical Devices Based on Paraffin-Heptane Treated Paper Substrate

介绍了一种新型的使用石蜡庚烷溶液制备纸基微流控分析装置的工艺,操作更加简单迅速,成本更加低廉。使用混合样品溶液进行测试,证明该装置可以完成对蛋白质、葡萄糖和PH值的同时检测,并可以用于定量分析。纸基微流控分析装置对样品检测的精度范围分别为:牛血清蛋白2.0x10-5~1.00x10-4MOl/l,葡萄糖0.02~0.1 MOl/l。并对加热处理过程中微流控通道壁的扩散现象进行了初步研究,发现加热前后通道壁厚度的变化呈线性规律。Paper is an ideal substrate material for low-cost diagnostic devices and shows a great potential in the fabrication of microfluidic paper-based analytical devices( μPADs).As one of the hot research fileds,a variety of materials and techniques have been proposed to fabricate μPADs.In this paper,we introduced a cheap,simpler and faster fabrication procedure,in which paraffin-heptane solution was used,toward this target.It is confirmed that as-developed protocol could be used for the simultaneous diagnostics of protein, glucose and pH.In addition,it is also applicable for quantitative analysis.The detection ranges of fabricated μPAD for bovine serum albumin and glucose were 2.0 × 10- 5~ 1.00 × 10- 4mol / L and 0.02 ~ 0.1 mol / L, respectively.This paper also preliminarily studied the spreading phenomena of microfluidic channel barrier during heating treatment.We found that the thickness of barrier followed a linear discipline.厦门大学化学化工学院和教育部博士点新教师基金项目(20120121120018); 国家自然科学基金(青年基金)项目(21205099)~