Results 61 to 70 of about 1,849,852 (95)
[Progress in the application of preparative gas chromatography in separating volatile compounds]. [PDF]
Se Pu, 2023 Mayira A, Zhong Z, Bai X.
europepmc +1 more source
Shuitu Baochi Xuebao, 2011 晋北风沙区防风林带结构不合理、效益低下,风沙严重地段土壤风蚀量可达120～135m3/hm2。为对防风林带的设计提供理论支撑,研究在分析晋北害风发生规律、风沙性质和表层土壤机械组成的基础上,通过建立数学模型对防风林带设计的关键因子进行研究。结果表明:(1)晋北风沙区距地面1m高的起沙风速为3.2m/s,全年1m高度92.1%害风风速为3.2～6.4m/s,且集中出现在10月至翌年5月。(2)影响防风林带效益的主导因子为林带疏透度,晋北风沙区林带疏透度为0.3时,林带的有效防风距离最大 ...
郭学斌 +3 more
doaj
, 1989 The Shiki kaishi is the official journal of the Matsuyama Shiki Society whose members study and promote the work of Masaoka SHIKI (1867-1902). Shiki was a major figure in the development of modern Japanese literature and the inventor of the modern haiku.
松山子規会, Matsuyama Shikikai
core
Shuitu Baochi Xuebao, 2007 采用样方法对辽宁章古台地区樟子松固沙林采伐迹地撂荒后1-5 a内自然恢复植被组成及多样性特征进行了定位研究,结果表明：采伐迹地自然恢复形成的自然植被群落共有49种植物,分属于26个科,以菊科和乔本科植物最为丰富。1a采伐迹地、2a采伐迹地、3a采伐迹地和5a采伐迹地植物群落的Simpson多样性指数分别为0.681,0.792,0.845和0.870,Shannon-Weiner信息统计指数、Pielou均匀度指数的变化趋势和S im pson优势度指数基本相似。植被总生物量由1.351 t/hm ...
吴祥云 +5 more
doaj +2 more sources
Shuitu Baochi Xuebao, 2008 采用定位取样与烘干法,测定了榆林沙区几个树种土壤含水量。结果表明:各树种土壤含水量变化规律为:樟子松>柠条>紫穗槐>沙柳>沙蒿>花棒-踏郎;土壤含水量的垂直分布格局为表层土壤含水量最低,随着土壤深度的增加,土壤含水量呈增加趋势;土壤含水量的季节动态规律为不同树种土壤含水量具有明显的季节变化规律,土壤含水量按季节变化可分为3个阶段,4-5月的土壤水分弱失水阶段,6-8月的土壤水分消耗阶段,9-10月的土壤水分缓慢恢复阶段。
尚爱军 +4 more
doaj
Changes in pharmaceutical market and "fake drug" problem in the Qing period. [PDF]
Uisahak, 2021 Choi J.
europepmc +1 more source
Revision of the genera Xanthogaleruca Laboissière, 1932 and Pyrrhalta Joannis, 1865 (Coleoptera, Chrysomelidae, Galerucinae) of Taiwan, with type designation of Galerucella lineatipes Takei. [PDF]
Zookeys, 2021 Lee CF, Bezděk J.
europepmc +1 more source
, 1998 The Shiki kaishi is the official journal of the Matsuyama Shiki Society whose members study and promote the work of Masaoka SHIKI (1867-1902). Shiki was a major figure in the development of modern Japanese literature and the inventor of the modern haiku.
松山子規会, Matsuyama Shikikai
core
, 2011 The Shiki kaishi is the official journal of the Matsuyama Shiki Society whose members study and promote the work of Masaoka SHIKI (1867-1902). Shiki was a major figure in the development of modern Japanese literature and the inventor of the modern haiku.
松山子規会, Matsuyama Shikikai
core +1 more source
, 1999 The Shiki kaishi is the official journal of the Matsuyama Shiki Society whose members study and promote the work of Masaoka SHIKI (1867-1902). Shiki was a major figure in the development of modern Japanese literature and the inventor of the modern haiku.
松山子規会, Matsuyama Shikikai
core