Performance Analysis of MIPv4 Regional Registration Combined with Low Latency Handoffs

The mechanism of MIPv4 regional registration and the low latency handoff protocols are introduced. Ways and procedure of pre-registration handoff and post-registration handoff are discussed also. The authors analyze the performance of the low latency handoff protocols combined with low latency handoffs over a wireless access based on IEEE 802. 11 standard in a tree-like network topology. The performance of pre-registration and post-registration scheme is given by simulation.     

Effect of H2O2 in the Bioremediation of Petroleum Hydrocarbon Pollutant

The high efficient strain was separated and filtrated from the soil contaminated by petroleum hydrocarbon. The authors, we focus on the effect of H2 O2 in the bioremediation of petroleum hydrocarbon pollutant. The results show that the optimal concentration of H2O2was 200 mg/L at one time. At the lag phase of the strain, H2O2 was added in per eight hour, and at logarithmic phase, H2O2 was added in per two hour. Biodegradation rate of petroleum hydrocarbon was increased from 38. 1% to 83. 1%. The bioremediation of petroleum hydrocarbon pollutant is remarkably by double effects of deep oxidation and oxygen supply of H2O2.     

大豆新品种伊大豆2号

大豆新品种伊大豆2号是1993年从黑龙江省木兰县大豆协会引进,系号8502,当年种植从中选出优良株,编号为931.经多年繁殖示范于2002年通过伊犁州农作物品种审定委员会审定.     

同源四倍体苦荞麦新品系97-1

苦荞麦是我国西南高寒山区、民族地区和边沿山区人民的主要食品之一。长期以来 ,产量低而不稳、品种混杂、退化严重 ,制约了这些地区经济的发展。 1 992年 ,我们在世界上首次采用秋水仙素 二甲基亚砜混合水溶液 ,对全国苦荞麦推广品种九江苦荞 (2 n=2 x=1 6 )进行染色体加倍处     

无籽黄瓜新品种山农一号

山农一号黄瓜是由烟台市农科院新育成的全雌节成型保护地专用无籽黄瓜品种。与一般黄瓜品种相比 ,具有以下优良特性 :全雌性　节成性　植株从第 2节起节节有瓜 ,而且整株雄花很少 ,几乎不能授粉受精 ,因而形成无籽黄瓜。极早熟　前期产量高　总产量高　早春温室从播种到收获仅需 4 7天 ,根瓜着生在第 2节或第 3节 ,前期产量 (前 4周 )达 75 0 0 kg,比长春密刺、中农110 1、津杂 2号分别高 79%、97.3%、115 % ;总产量分别高 4 7%、73.5 %、113.3%。生长势强　抗病抗逆性强　播种后 5 0天植株的株高、节数、茎粗、叶面积分别比长春密刺高4 0 %…     

杂交油菜中油杂2号种子生产全程质量保优体系建设

中油杂2号是中国农业科学院油料作物研究所利用秦油2号不育胞质2A培育而成的双低三系杂交油菜新品种,是一个集高产、优质、稳抗、广适于一身的超优势品种,被列为国家863计划重大成果,是国家科技部、农业部确定的“十五”首批主要农作物“后补助”新品种,并被农业部指定为长江流域主推品种。自2001年迅速推广应用以来,两年累计全国种植面积60万hm2。中油杂2号得以迅速推广普及,不仅得益于该品种自身优良的种性,也同时得益于种子生产质量的高水准、高保障。我公司自1998年开始从试制逐年扩大制种面积并稳具规模。为确保生产杂交种的高纯度、…     

香软型水稻品种红优1号

红优 1号是云南省红河哈尼族彝族自治州农业科学研究所用东风 F331作母本, IR64作父本杂交选育而成的常规籼型优质稻品种, 2001年 7月通过云南省农作物品种审定委员会审定,编号为滇籼 (优 )20号, 2002年 4月荣获云南省第三届优质米品种铜奖.云南省农业厅从 2001年起连续 3年把该品种列为云南省重大农技推广项目并给予重点扶持.     

Pinning Theory of Fermi Energy and Surface State Measurement of ZnSnO3 Gas Sensitive Material

In order to research the state of energy bands and gain and loss of electrons on the surface of ZnSnO_(3),it is put forward that Pinning theory of Fermi energy is applied to development of gas sensitive materials.The relative position between surface state and conduction band on surface of zinc tin complex oxide(ZnSnO_(3)) gas sensitive material has been investigated by utilizing oxidation redox couple,FeCl_(2)/ FeCl_(3),which have high surface state.Fermi energy is pinned at about 0.2 eV below conduction band E_(cs)on the surface of ZnSnO_(3).It has been determined that additives doping ratio,addition concentration and working atmosphere have no effect on this value.Therefore,pinning theory of Fermi energy has been verified by using this method.