绿色创建 夯实基础着力推进马铃薯产业发展再上新台阶

凉山州人民政府创建全国绿色食品原料马铃薯标准化生产基地10.13万hm^2。本文重点概述凉山州创建全国绿色食品原料马铃薯标准化生产基地的目的、工作思路和保障措施,加快优势资源向强势产业的转化,以全国绿色食品原料马铃薯标准化生产基地创建推进凉山马铃薯产业发展再上新台阶。     

Review and prospect of transgenic rice research

Rice is one of the most important crops as the staple food for more than half of the world＇s population. Rice improvement has achieved remarkable success in the past half-century, with the yield doubled in most parts of the world and even tripled in certain regions, which has contributed greatly to food security globally. Rapid population growth and economic development pose a constantly increased food requirement. However, rice yield has been hovering in the past decade, which is mainly caused by the absence of novel breeding technologies, reduction of genetic diversity of rice cultivars, and serious yield loss due to increasingly severe occurrences of insects, diseases, and abiotic stresses. To address these challenges, Chinese scientists proposed a novel rice breeding goal of developing Green Super Rice to improve rice varieties and realize the sustainable development of agriculture, by focusing on the following 5 classes of traits： insect and disease resistance, drought-tolerance, nutrient-use effi- ciency, quality and yield potential. As a modern breeding approach, transgenic strategy will play an important role in realizing the goal of Green Super Rice. Presently, many transgenic studies of rice have been conducted, and most of target traits are consistent with the goal of Green Super Rice. In this paper, we firstly review technical advances of rice transformation, and then outline the main progress in transgenic rice research with respect to the most important traits： insect and disease-resistance, drought-tolerance, nutrient-use efficiency, quality, yield potential and herbicide-tolerance. The prospects of developing transgenic rice are also discussed.     

校园景观中绿化植物的选择与配置

本文对校园绿化植物的选择与配置做了较为详尽的分析和介绍,希望能对从事这些工作的人有所帮助。     

关于一类二阶微分方程正解的存在性

本文研究带混合两点边值条件的二阶微分方程：u“ m^2u f(t,u)=0,αu(0)-βu‘(0)=0,γu(1) δu‘(1)=0正确的存在性问题,利用[1]中的方法构造了Green函数,并借助锥不动点定理证明了上述非线性二阶微分方程正解的存在性。     

放大器型双极化有源微带天线阵的理论与实验

基于Green函数法推导出角馈双极化微带天线单元的输入阻抗和互阻抗的闭合表达式,并用腔模理论分析了其阵列的主极化和交叉极化方向图.设计了一副4×4元天线阵与低噪声放大器相接,将天线阵增益提高了12dB.有源器件对天线阵的方向留影响较小,方向图主瓣范围内交叉极化低于-36dB.有源天线阵的VSWR带宽和隔离度均大于无源天线阵.     

用边界元分析功能梯度材料的稳态热传导

假设材料梯度参数热传导率以指数形式变化,应用Green函数导出了功能梯度材料稳态热传导问题的边界积分方程,提出用均匀材料的Green函数及与材料梯度参数有关的项共同表达梯度材料的Green函数。以某梯度材料转子为例,用边界元法对其进行了稳态热传导分析,并通过与有限元方法所得分析结果进行对比验证此方法的正确性。     

界面脱胶圆衬砌对出平面动力的响应

采用Green函数法研究含有界面和半圆形脱胶衬砌的全空间对任意角度入射的出平面波的动力响应。将整个空间分为含有半圆形凸起的圆形衬砌的下半部分和含半圆形孔洞的上半部分,并给出在各自水平表面上任意位置施加与时间谐和的出平面线源荷载时上下半空间产生的位移场。取两个位移函数作为Green函数,在界面处应用连续性条件对上下半空间实施"契合",并通过边界条件构造半圆形脱胶,求解全空间在承受出平面动载荷时各部分应力和位移的表达式。弹性衬砌周边及脱胶结构周边的动应力集中因数的数值结果表明,入射波参数及介质参数对动应力集中因数是有影响的。     

非线性分数阶微分方程三点边值问题mild解的存在性

研究Banach空间下一类非线性分数阶微分方程边值问题．构建此类方程的Green函数,利用非紧测度、Darb0不动点定理及Monch不动点定理,得到了此类方程的mild解存在的几个充分条件,所得结果推广了一些已有的结论．     

“绿色革命之父”诺曼·布劳格

布劳格是国际著名的小麦育种学家、诺贝尔和平奖得主,其培育的20多个小麦矮杆高产品种对世界粮食生产产生了积极影响。因其终生致力于以农业技术创新消除发展中国家的饥饿和贫困问题,他被国际社会誉为最杰出的反饥饿斗士、绿色革命之父。本文对布劳格的生平、育种科研和推广活动以及社会贡献进行系统介绍。     

点内库仑相互作用对三量子点系统输运性质的影响

本文利用非平衡格林函数运动方程方法,研究了与两个电极耦合在一起的三耦合量子点系统中,点内部的库仑关联或阻塞与点间的耦合强度对体系输运性质,即对系统微分电导和系统态密度的影响.通过理论计算发现,由于量子点上的局域态密度的不同从而导致系统微分电导或隧穿性质的不同,会开启新的Kondo输运通道,也会增强一些原有的输运通道.