安徽省肉羊产业现状及发展对策

安徽省肉羊产业发展迅速,近年来的年平均增长率一直处于国内前列。但在现代畜牧业的整体发展进程中,肉羊产业的发展仍面临着巨大的挑战。文中综述了安徽肉羊产业现状、存在问题、产业发展关键技术瓶颈,提出了发展我省肉羊产业的思路与建议。     

非线性抛物方程整体解的存在性和爆破

考察了一类非线性抛物型方程非局部边界条件和局部源问题,利用上下解方法和比较原理,得到了整体解的存在性和爆破结果.     

一类四阶两点边值问题解的存在性

应用Leray Schauder原理,研究四阶两点边值问题{u(4)(t)=f(t,u(t),u"(t)),t∈(0,1) u'(0)=u'(1)=u"'(0)=u"'(1)=0 解的存在性,在两参数非共振条件以及非线性项f满足至多线性增长性条件下给出了此类问题有解存在的最优充分条件,最后举例说明了所获结果.     

大型医院图书馆的生存危机与相应对策

对大型医院图书馆在当前医院发展中的困境进行了分析,并对医院图书馆如何摆脱制约,开拓创新,谋求长远发展进行了探讨。

     

The role of gape‐limitation in intraguild predation between endangered Mohave tui chub and non‐native western mosquitofish

Intraguild predation (IGP) is a mechanism that may facilitate the co‐existence of native species with non‐native invasive species. We conducted laboratory predation trials to assess the role of predator gape‐limitation in the context of IGP between the endangered Mohave tui chub (Siphateles bicolor mohavensis) and invasive western mosquitofish (Gambusia affinis). Larval tui chubs had significantly lower (χ² = 74.74; P < 0.001) survival in the presence of female mosquitofish (10.0%) than in the presence of male mosquitofish (73.3%). Reciprocally, adult tui chubs preyed upon adult mosquitofish, causing a significantly lower (χ² = 11.33; P < 0.001) survival for male mosquitofish (60%) compared to female mosquitofish survival (96.7%). Vulnerability modelling revealed that mosquitofish with a body depth < 4.6 mm and a larval tui chub with a body depth < 1.2 mm were completely vulnerable to predation by adult Mohave tui chub and adult mosquitofish, respectively. IGP in this study system is size‐structured based on gape‐size limitation and may have some conservation implications for the recovery of endangered Mohave tui chub. Our findings also provide an important caveat to the dogmatic view of mosquitofish as a threat whenever they invade. It is important to note that many previous studies that reported negative impacts of mosquitofish involved native species with relatively small body sizes, often the same size as mosquitofish.     

含有多个滞量的微分差分方程周期解的存在性

本文给出了比ＫａｐｐｌｅｍＪＬ和温立华等人对Ｘ（ｔ）＝-ｇ（ｘ（ｔ）,ｘ（ｔ-ｒ＿１）＋ｆ（ｘ（ｔ-ｒ＿２））］一般系统更广泛一类的泛函微分方程Ｘ（ｔ）＝-ｇ（ｘ（ｔ）,ｘ（ｔ-τ＿１）,ｘ（ｔ-τ＿２））,［ｆ（ｘ（ｔ-τ＿１））＋ｆ（ｘ（ｔ-τ＿２））］的非常数周期解存在的充分条件。     

二阶中立型泛函微分方程非振动解的存在性定理

本文研究了一类二阶中立型泛函微分方程非振动解的存在性、所得结论回答了如何建立中立型方程的非振动解的存在准则问题.     

非合作博弈的轻微利他平衡点的存在性

在Marco和Morgan提出博弈论中一种新的解——轻微利他平衡的基础上，讨论了一类不连续博弈的轻微利他平衡点的存在性，进一步讨论了支付函数更弱情况（拟凹）的轻微利他平衡点的存在性．     

具变指数高阶抛物方程弱解的存在性和唯一性

考察了一类变指数高阶抛物方程弱解的存在性和唯一性问题.结合Steklov平均数以及Orlicz-Musielak空间,根据时间离散方法和解的先验界估计,得到了该问题解的存在性和唯一性.     

试析巴赫金小说时空体理论的诗学特征

本文从以下三个方面论述巴赫金小说时空体理论的诗学特征。一、概述了巴赫金对小说时空体的历史发展情况的研究,揭示了巴赫金时空观的艺术功能转变。二、从体裁诗学的角度论述了时空体的理论核心及其对复调小说类型的形成意义:时空的有机融合孕育了对话情境,使对话成为可能。而对话特征正是复调小说的核心。三、从文化诗学的视角彰显出复调小说时空体的文化精神。时空渗入人的心灵,是人的存在的理想家园。