三元二次对称平均对幂平均的分隔及应用

Ｐ２（ｘ）是三元二次初等对称平均，Ｍｓ（ｘ）是ｓ次幂平均。本文求出了使不等式Ｍｐ（ｘ）≤Ｐ２（ｘ）≤Ｍｑ（ｘ）成立的最大ｐ和最ｑ。把这个结果用于任意ＡＢＣ，我们得到Ｍｋ（ｍａ）≥３ｒ，ｋ≥（ｌｎ３）／（ｌｎ２—ｌｎ３）；Ｍｔ（ｍａ／ａ）≥／２≥Ｍ－ｔ（ｍ／ａ），ｔ＞（ｌｎ９—ｌｎ４）／ｌｎ３；Ｍｋ（ｈａ／ｒａ）≥１，ｋ≥（ｌｎ３—ｌｎ２）／ｌｎ２；Ｍｋ（ｒａ／ｍａ）≥１，ｋ≥（ｌｎ３—ｌｎ２）／ｌｎ２，其中ａ，ｒ，ｒａ，ｈａ，ｍａ分别是边长，内切国与旁切国的半径，高以及中线。     

Fluorescence and sensitization performance of phenylene-vinylene-substituted polythiophene

A new kind of polythiophene derivative, Poly(3-{2-[4-(2-ethylhexyloxy)-phenyl]-vinyl}-2,2′-bithiophene) (PTh), was applied in dye-sensitized solar cell to extend the light response of nanocrystalline TiO2 electrode. UV-vis absorption and fluorescence spectra were employed to investigate the interaction of PTh with nanocrystalline TiO2. The absorption coefficient of the PTh was high in visible part of spec- trum, and the fluorescence emission of the PTh can be efficiently quenched by TiO2 nanoparticles ow- i...     

A model of calcium signaling and degranulation dynamics induced by laser irradiation in mast cells

Recent experiments show that calcium signaling and degranulation dynamics induced by low power laser irradiation in mast cells must rely on extracellular Ca^2＋ influx. An analytical expression of Ca^2＋ flux through TRPV4 cation channel in response to interaction of laser photon energy and extracellular Ca^2＋ is deduced, and a model characterizing dynamics of calcium signaling and degranulation activated by laser irradiation in mast cells is established. The model indicates that the characteristics of calcium signaling and degranulation dynamics are determined by interaction between laser photon energy and Ca^2＋ influx. Extracellular Ca^2＋ concentration is so high that even small photon energy can activate mast cells, thus avoiding the possible injury caused by laser irradiation with shorter wavelengths. The model predicts that there exists a narrow parameter domain of photon energy and extracellular Ca^2＋ concentration of which results in cytosolic Ca^2＋ limit cycle oscillations, and shows that PKC activity is in direct proportion to the frequency of Ca^2＋ oscillations. With the model it is found that sustained and stable maximum plateau of cytosolic Ca^2＋ concentration can get optimal degranulation rate. Furthermore, the idea of introducing the realistic physical energy into model is applicable to modeling other physical signal transduction systems.     

Comparison of Drought-Resistance about Three Wild Rocky-Grasses

In this experiment, using the methods of drought-stress in the pot and PEG simulative drought-stress, three native rocky-slope grasses Pogonatherum panideum（Lam.） Hack, Erioophorum comosum nees and Cynodon dactylon cultivated in the pots were selected as materials to study their drought-resistance by analyzing the indexes such as the leaf area index, the drying roots accumulation, the holding water ability of leaf, the relative conductance of leaf, the soluble protein, chlorophyll. At the same time, by comparing with membership function value of each index, the order of each grass drought-resistance was decided. The results showed that the drought-resistance of Erioophorum comosum nees was stronger than Cynodon dactylon and drought-resistance of Cynodon dactylon was stronger than Pogonatherum panideum （Lam.） Hack. The purpose of the experimental results was to find theoretical foundations for selecting and cultivating native protecting-slope vegetations to adapt to rocky slopes.     

Kinect技术与工作原理的研究

Kinect利用外接的3D体感摄影机,可以进行即时动态捕捉、影像辨识、麦克风输入、语音辨识等,实现了用肢体做遥控器的功能.介绍了Kinect的硬件设备构造,探讨了Kinect的工作原理及应用,并给出Kinect目前存在的一些问题.     

关于Cpp单群

本文定出了所有的有限C_n单群,其中p是素数,p=2~σ3~β+1,α,β为非负整数.     

准噶尔盆地西北缘二叠系砂砾岩储层主控因素

准噶尔盆地西北缘二叠系碎屑岩储层的岩石学特征和物性特征的研究表明:克—百地区储层类型主要是小砾岩和砂砾岩,物性以夏子街组(P2x)为好,风城组(P_1f)和下乌尔禾组(P_2w)较差,上乌尔禾组(P3w)较好;车—拐地区储层类型主要是砂砾岩和小砾岩,物性以下乌尔禾组(P2w)为最好,上乌尔禾组(P_3w)及佳木河组(P_1j)次之.在此基础上,通过对岩芯、薄片、测井,录井及扫r电镜资料的分析,研究了沉积环境及成岩作用对准噶尔盆地西北缘二叠系砂砾岩储层物性的控制作用.研究区以扇三角洲沉积相为主,其前缘水下分流河道微相水动力条件最强,储层的泥质杂基含量最低、物性最好;平原分流河道微相水动力条件较强,在合适的条件下也可以形成优质储层;前缘水下分流河道间、平原漫滩、平原沼泽等微相由于水动力条件较弱,沉积物泥质杂基含量较高,难以形成有效储层;研究区少量发育的冲积扇相沉积物的物性大多数较差,仅扇中及扇缘的部分河道沉积物物性较好.研究区对储层物性影响明显的成岩作用主要是压实、胶结、溶蚀作用,其中压实作用是储层物性最主要的破坏性成岩作用,造成了储层物性不可逆的降低;依胶结物含量的不同,胶结作用对储层物性具有双重作用;溶蚀作用是产生次生孔隙和裂缝,并具有连通作用的最重要的建设性成岩作用.总结了研究区砂砾岩储层的主控因素:沉积相带是控制碎屑岩储层物性的关键因素,压实作用强度是决定碎屑岩储层物性条件的主要因素,胶结作用的发育程度对储层原生孔隙的保存和次生孔隙发育影响较大,酸性孔隙流体运动活跃的疏导层是溶蚀孔隙发育区和油气聚集的有利区带.     

~(20)Ne核谱在壳模型,Democratic mapping和微观IBM方案中计算结果的直接比较

对于20Ne核,在相同的核壳和单粒子能级下,将在壳模型,Democracticmapping（DM）和微观IBM方案下的计算能谱与实验值作了直接比较通过DM揭示出壳模型理论与微观IBM理论间的关系：至少在sd壳上,后者源于前者,又是完成前者计算的一条好途径与一个好近似.     

浅析豫南粳稻优质高产栽培策略

产量低、病虫害重、品质下降是豫南粳稻难以发展的直接原因.将粳稻置于高温、高湿的生态条件下栽培是其病虫害重、产量低、品质下降的根本原因.解决上述问题的唯一途径是推迟灌浆成熟期,将成熟期由目前的9月上旬推迟到10月中旬.对信阳市48年主要气候因子统计结果表明,推迟粳稻成熟期,有利于改善粳稻生长发育的生态条件,并能保证安全成熟.     

自由基介导C—H键环化合成吲哚酮的研究进展

吲哚酮及其衍生物广泛分布在自然界中,其合成方法研究是当前合成化学领域中的热点之一.按照偶联的方式及其相关的机理,对近几年来自由基介导C—H键环化合成吲哚酮研究进行了归纳,从催化剂、氧化剂和溶剂等反应条件对反应体系的影响出发,讨论了C—H键的切断方法.