草原封育时间对昆虫群落组成结构的影响——以吉林省西部草地为类

2014年5-9月,我们对吉林省西部不同封育年限草地中昆虫群落进行了连续地系统地调查,基本明确了各类型草地昆虫群落的组成结构格局、多样性,并分析了封育时间、封育方式对昆虫组成结构及时空动态的影响。本文主要论述吉林省西部草地生态恢复过程中昆虫群落组成结构的的变化和季节动态,说明不同封育阶段对昆虫群落的组成影响。为吉林省西部草地生态恢复过程中害虫防治和昆虫物种多样性保护的相关研究提供了基础资料。     

基于短信息的计算机与手机通信平台研究与实现

介绍了计算机与手机进行短信通信的原理,并对短信息结构做了详细分析.给出了计算机接收和发送短信的实现方法.针对短信内容在数据库中的保密问题,提出了一种用正则表达式识别需加密部分和用RSA加密保护的方法.     

浅谈高速公路施工中的工程质量管理

近年来,交通运输业呈现出蓬勃发展的态势,而高速公路作为我国交通运输的重要方式之一,其地位越来越突出,并且对高速公路的工程质量要求也随之而增高,然而实际上,我国高速公路的施工管理中仍然存在着各种问题,为了解决这些问题,提出了一些切实可行的提高工程质量管理的措施。     

配合物[AgAc(AsPh3)3]·MeOH的合成和晶体结构

本文研究了醋酸银(AgAc)与三苯砷(AsPh3)及2一氨基吡啶(2-Apy)的配位反应,使用溶液法合成了配合物[AgAc(As Ph3)3]·MeOH,并且通过IR和X射线单晶衍射进行结构表征.结构数据表明.配合物为三斜晶系:a=0.131 505(4)nm,b=0.139 366(4)nm,c=0.142 807(4)nm,α=84.330(2)°,β=87.972(2)°,γ=77.586(2)°.     

采用非匹配网格离散的快速边界元-有限元宽频声振耦合分析

为构造出性能优异的声振耦合仿真系统,采用直接耦合方法建立了声振问题的边界元-有限元耦合方程,并对其求解方案的选取进行了详细讨论,最终实现了大规模耦合线性方程组的快速求解;考虑更具一般意义的耦合界面上声场边界元网格和结构有限元网格不匹配的情形,采用加权余量法构造了高阶非匹配单元之间的数据交换矩阵,实现了耦合界面上各物理场之间的高精度数据交换;介绍了适用于宽频问题的快速定向算法的实现原理,并将其引入声振耦合方程,在全频段内实现了对常规边界元矩阵的有效压缩,提高了声振耦合方法的计算效率;通过解析算例和自由度超过40万的大规模复杂算例,验证了本文方法的正确性和性能,特别是与现有同类方法相比,本文方法在保证高精度的同时,适用频段明显更宽,可达现有方法的3～4倍。     

Synthesis,Characterization and Luminescent Properties of Two Copper(Ⅰ) Complexes Based on 2,2?-Biquinoline and Phosphorous Ligand

Three new copper(Ⅰ) complexes, namely [Cu(DPEphos)(Biq)]CF_3SO_3(1) and [Cu(PPh_3)_2(Biq)]CF_3SO_3(2) and [Cu(PPh_3)_2(Biq)]ClO_4(3)(DPEphos = bis[2-(diphenylphosp hino)phenyl]ether, PPh_3 = triphenylphosphine and Biq = 2,2?-biquinoline), are synthesized and characterized by IR, ~1H NMR, ~(31) P NMR, fluorescence spectra and terahertz time-domain spectroscopy(THz-TDS). Complex 1 crystallizes in triclinic, space group P1 with a = 12.6997(5), b = 13.2813(5), c = 15.3593(6) ?, α = 80.211(3)°, β = 88.752(3)°, γ = 70.113(3)°, V = 2398.85(15) ?~3, C_(55)H_(41.2)CuF_3N_2O_(4.6)P_2S, Mr = 1018.27, Z = 2, Dc = 1.410 g/cm3, F(000) = 1048, μ = 0.628 mm-1, the final R = 0.0450 and w R = 0.1105 for 9419 observed reflections(I 2σ(I)). Complex 2 crystallizes in monoclinic, space group C2/c with a = 19.9961(7), b = 15.9774(5), c = 17.7908(6) ?, β = 119.758(4)°, V = 4982.8(3) ?~3, C_(56.47)H_(47.88)CuF_3N_2O_(4.47)P_2S, Mr = 1040.54, Z = 4, Dc = 1.387 g/cm~3, F(000) = 2154, μ = 0.606 mm-1, the final R = 0.0430 and w R = 0.1218 for 4897 observed reflections(I 2σ(I)). Complex 3 crystallizes in monoclinic, space group C2/c with a = 19.7534(8), b = 15.0797(5), c = 17.8097(7) ?, β = 116.400(5)°, V = 4751.8(3) ?~3, C_(56)H_(45)ClCuN_3O_4P_2, Mr = 984.88, Z = 4, Dc = 1.377 g/cm~3, F(000) = 2040, μ = 0.635 mm-1, the final R = 0.0731 and w R = 0.2180 for 4670 observed reflections(I 2σ(I)). In the emission spectra, shifts of emission peak are derived from ligand-centered(π-π*) transition.     

Multiferroic and enhanced microwave absorption induced by complex oxide interfaces

NiFe_2O_4(NFO)/ZnO composite nanoparticles with different ZnO components were investigated, which were prepared by a simple wet chemical route method. The magnetoelectric coupling between magnetostriction from NFO and piezoelectricity from ZnO was induced by the surface coating NFO nanoparticles of ZnO layer, NFO/ZnO composite showed ferroelectric properties and the remanent electric polarization reached 0.08 μC/cm. Moreover, the changes of resistance at different room temperatures reached about 2% under 3 T magnetic fields comparing with that of zero magnetic fields. Furthermore, multiferroic NFO/ZnO resulted in enhancement of microwave absorption due to magnetoelectric coupling.     

浅析我国社区卫生服务的现状及对策干预

本文对我国社区卫生服务现状进行分析,针对目前存在的不足之处,提出相应的对策干预。     

电视广告:在塑造中刻板女性形象

当前,随着社会文化的发展,中国电视广告中已经出现独立、自信、美丽的现代职业女性形象。但由于受到性别心理差异和社会传统心理的影响,女性形象的物化倾向和性别歧视倾向仍然严重存在,强烈的性别角色差异形成了电视广告中女性的刻板印象。