湍线性微分系统的性质

本文给出了关于湍线性微分系统指数型二分性的几个结果。证明了：若Ａ（ｔ）是ｎ阶湍方阵，则存在ω＿０＞０，当ω≥ω＿０时，湍微分系统Ｘ’（ｔ）＝Ａ（ωｔ）Ｘ（ｔ）的相关系统是几乎可约的，在适当的条件下得到，存在ω＿）＞０，使系统Ｘ（ｔ）＝Ａ（ωｔ）Ｘ（ｔ）是几乎可约的（ω≥ω＿０）．     

大白菜的组织培养研究

研究了不同外植体、激素组合、苗龄、ＡｇＮＯ３、ＡＢＡ等因素对热大白菜不定芽诱导率的影响。结果表明：６日龄的子叶是最适外植体;在含有ＢＡ１．５ｍｇ／Ｌ＋ＮＡＡ０．５ｍｇ／Ｌ的ＭＳ培养基上,添加ＡｇＮＯ３ ４ｍｇ／Ｌ和ＡＢＡ０．５ｍｇ／Ｌ可明显提高大白菜不定芽的分化率。     

海南中草药材鸡屎藤离体培养的研究

利用组织培养方法对鸡屎藤进行离体培养的研究,结果表明：以鸡屎藤茎节、嫩叶作外植体能诱导产生愈伤组织,并能诱导产生不定芽．诱导愈伤组织的培养基以 ＭＳ＋６－ＢＡ ０．５ｍｇ·Ｌ－１＋ＮＡＡ０．５ｍｇ·Ｌ－１效果较好;诱导不定芽的培养基以ＭＳ＋６－ＢＡ４ｍｇ·Ｌ－１＋ＮＡＡ０．５ｍｇ·Ｌ－１效果较好;本文还报道了鸡屎藤的生根和移栽技术．     

番茄的组织培养及不定芽分化过程中过氧化物同工酶的变化

番茄幼叶或幼茎外植体在ＢＡ２ｍｇ·Ｌ￣（－１）．ＩＡＡ０．２ｍｇ·Ｌ￣（－１）的ＭＳ培养基中诱导产生大量不定芽和芽丛，将不定芽转移到ＩＡＡ０．２ｍｇ·Ｌ￣（－１）的ＭＳ培养基中，由切口直接产生大量不定根。不定芽分化过程中，５～１０ｄ之内过氧化物同工酶活性增强，条带增多．在进一步的发育过程中、同工酶酶谱变化较为平缓。当愈伤组织上不定芽增多时，过氧化物同工酶条带有减少的趋势，相应的强度也有所降低。对番茄组织培养中基因型的影响，以及过氧化物同工酶在不定芽分化过程中可能的作用也进行了讨论．     

胀果甘草气孔振荡实测结果的解析表达及计算机模拟

给出了反映胀果甘草气孔振荡规律的解析表达式，它为Ｊ＝Ａ０＋Ａ１ｃｏｓ（ωｔ＋ψ１）＋Ａ２ｅ＾－ｔＡ３ｃｏｓ（ω＋ψ３）ｃｏｓ（ωｔ＋ψｗ）。由实测结果确定各待常数后，计算机模拟作出的图象与实测图极其吻合。     

非洲紫罗兰组织培养与工厂化快繁程序的研究

非洲紫罗兰叶片外植体在ＭＳ附加ＮＡＡ０．１ｍｇ／Ｌ,ＢＡ１ｍｇ／Ｌ的培养基上培养,获得大量不定芽,将小芽丛转入ＭＳ附加ＮＡＡ０．ｍｇ／Ｌ,ＢＡ０．１ｍｇ／Ｌ的培养基上,小芽进一步发育形成小苗,然后将小苗切下转入不含激素的ＭＳ培养基上生根。生根试管苗经炼苗后移入花盆,生长良好。     

带不同密度的非线性奇异积分方程组的可解性

在Ａ．И．ГｙｃｅЙНＯＢ等工作的基础上提出了并讨论带有不同密度的非线性奇异积分方程组的可解性。通过构造与之可解性相同的每个方程只有一个密度的方程组,证明了对给定的广义Ｈｏｅｌｄｅｒ空间Ｈｋ１,ｋ２（ω１,ω２,ω）在存在常数λ０当│λ│≤λ０时方程组可解。     

风信子外植体植株再生系统的研究

风信子叶片及鳞片直接诱导下定芽的培养基为ＭＳ附加６－ＢＡ２．５ｍｇ／Ｌ、ＮＡＡ２．０ｍｇ／Ｌ、ＩＡＡ０．５ｍｇ／Ｌ和ＭＳ附加６－ＢＡ２．５ｍｇ／Ｌ、ＮＡＡ２．５ｍｇ／Ｌ。不定芽发育成小鳞茎的培养基为ＭＳ附加ＧＡ０．２ｍｇ／Ｌ、ＩＡＡ０．５ｍｇ／Ｌ。鳞茎移栽成活率为９０％,从而建立了风信子植株再生系统。     

关于C0—算子半群的紧扰动

设Ａ是Ｂａｎａｃｈ空间Ｘ中的Ｃ０－算子半群ｅ＾ｔＡ的无究小生成,Ｋ是Ｘ中的有界线性算子,本文证明了Δ（ｔ）＝ｅ＾ｔ（Ａ＋Ｋ）－ｅ＾ｔＡ对ｔ〉０是紧算子当且仅当Δ（ｔ）对ｔ〉０按一致算子拓扑连续且对λ∈ｐ（Ａ）（Ａ的豫解集）,（λ－Ａ）＾－１Ｋ（λ－Ａ）＾－１是紧算子。此外若Ｘ是可分Ｈｉｌｂｅｒｔ空间,则Δ（ｔ）对ｔ〉０按一致算子拓扑连续的条件等价于对τ〉ω（Ａ）（ｅ＾Ａ增长界）,ｌｉｍ│ω│→∞‖     

虎眼万年青不同形态发生途径激素调控的初步研究

用虎眼万年青鳞片外植体在ＭＳ培养基上实现了不同形态发生途径的激素调控。结果显示，生长素和细胞分裂素两类激素的不同组合和浓度搭配都是影响形态发生途径的关键因素，甚至前者更为重要。就最佳激素组合和浓度搭配而言，ＮＡＡ０．５ｍｇ／Ｌ＋ＢＡ０．５ｍｇ／Ｌ和ＮＡＡ０．５ｍｇ／Ｌ＋ＫＴ０．５ｍｇ／Ｌ分别诱导体细胞胚和不定芽直接发生；２，４－Ｄ４．０ｍｇ／Ｌ＋ＢＡ１．０ｍｇ／Ｌ诱导愈伤组织；２，４－Ｄ０．１ｍｇ     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of