王卫 让“快递基因”自然生长

顺丰的一举一动,总会成为焦点。作为内地第一家使用全货运专机的民营速递企业,顺丰快递凭借互联网购物的快速发展以及长期积累的行业口碑,迅速蚕食快递业市场。     

“我野蛮，我成长”

一个变革的时代，一群过河的人，一种野蛮生长的力量!一部民营企业和创业人生的史书!地产界思想家、万通集团董事长冯仑纵横江湖20年，第一次出书。著名漫画家聂峻为此书创作插图30余幅。柳传志、王石等强力推荐。     

奥巴马时代的奇迹

他年轻时吸过毒；他喜欢打篮球和扑克；他是芝加哥白袜队的死忠球迷；他为了竞选总统戒了烟；他是一个左撇子；他是两个女儿的父亲；上一任总统布什给他起了“巴马”（bama）和“岩石”（rock）的绰号；在社交网站facebook．coin上他建了自己的主页；他是美国第44任总统和第1任有非洲血统的总统；他是两本书的作者以及无数本书都在谈论的人；他是巴拉克·奥巴马。     

像《折腾》一样折腾

这是个折腾的时代,《折腾》的作者戴定南是位赤贫出身的奇人,他把自己的事业折腾到了纽约曼哈顿的世贸大厦。随着"9·11"事件双子塔的崩溃和燃烧,他的商业帝国也遭灭顶之灾,他的雄心壮志变成了炼狱中的另一种折腾——在死亡与复活之间挣扎。作者把"折腾"写得真实而又奇异,写得惊心动魄而又出神入化。《折腾》是关于一代人的寓言,它就像一面镜子,每个人从中都可以看到自己的影子……     

峡谷型水源水库的氮、磷季节变化及其来源分析

石砭峪水库总氮(TN)和总磷(TP)的质量浓度均值分别为2.67 mg.L-1和0.04 mg.L-1,其在丰水期最大,平水期次之,枯水期最小;水库富营养化严重,叶绿素a含量和藻细胞密度分别高达50 mg.m-3和10 000×104cells.L-1.水库TN的年输入和输出负荷分别为203.1 t和181.3 t,而TP的年输入和输出负荷分别为4.2 t和4.1 t;外源输入水库的TN和TP负荷均占各自总输入负荷的90%以上;就全年而言,水库沉积物表现为蓄积作用,TN和TP年净积累量分别约为20.2 t和0.8 t;内源污染控制是水库污染控制的关键.     

关于那遥远的未知

5.12,中华大地的一场震颤,震醒了我们对灾难的意识,我们开始重新审视这个自从创世开始就遗留的谜团,科学在这里发生了强烈碰撞。《上帝的指纹》——1995年出版后迅速风靡世界,作者葛瑞姆·汉卡克通过一系列匪夷所思却又难以辩驳的论证,向读者揭示了一段与通常认知截然不同的人类文明史……     

影响世界的龙与象

当两个世界人口大国同时崛起,二十亿人同步走出贫穷,带着新财富跨入世界,会带来什么样的影响？中国和印度,一直都是世界关注的焦点,人人都想搞清楚龙与象的真正面目。关于他们的书每年也总会有几本,近期撞衫对杀比较激烈的就有《龙与象》和《中国龙与印度象》。旁观者清。本期就让我们透过老外的眼睛,预测一下中印未来的命运……     

管华诗 用海洋胸怀做海洋事业

他不是医生。却挽救了无数患者的生命;他做研究的实验室最初是用厕所改造的,但成果斐然;他为了研制新药,险些丧命,喷出的高压热油与他擦身而过;他被称为最富有的工程院院士……     

各地区抢滩物联网

上海抢跑,投8亿元攻核心技术2009年3月2日,上海物联网中心在上海嘉定揭牌。上海将以此打造国内最具竞争力、具有国际影响的物联网技术研发基地,形成规模应用示范,推动物联网及其相关产品、服务的产业化。上海已确定将物联网产业发展作为下一步信息产业发展的重点之一。     

Dynamic characteristics of woody plant regeneration in karst secondary forests in central Guizhou北大核心CSCD

Based on community data (2012, 2020) of the Tianlong Mountain evergreen and deciduous broadleaved mixed forest plot in central Guizhou, China, the species composition, importance value index, diversity, and dynamic changes were estimated to explore the renewal and change characteristics of karst secondary forests. The results showed that: (1) the number of individual species in the investigated two hm2 plot encompassing 33 families and 55 genera, totaling 69 species decreased from 10 276 to 7837. Five families, 10 genera, and 18 species were newly added, while seven families, nine genera, and 11 species disappeared. The difference between the importance value indices of the species was obvious; that of Lithocarpus confinis (20.97–23.26) was much higher than that of other species. Except for some species, the overall inter-annual differences were not large, and the status of mesophytic and shaded species has increased. Life forms were dominated by small trees and shrubs or small trees, and the plant number density of different life forms is reduced. (2) The Margalef and Shannon-Wiener indices of shrubs were the largest, and the Pielou indices of shrubs or small trees were the largest. The composition of most life forms has increased; the diversity became richer; and the uniform distribution of individual species has increased, but the change was small. (3) With respect to the spatial distribution pattern, the species were generally clustered, and only a few were randomly distributed. The Cx, I, m*, CA, and G indices of the species were reduced, and those of some species were quite different. A tendency for aggregated distribution was observed over random distribution, but the aggregation degree of Lithocarpus sphaerocephala was still high. The PAI index of most species increased but was not obvious, whereas the K value changed irregularly. Overall, the species composition, importance value index, diversity, and spatial distribution pattern of the main species in this community have changed to some extent but without any significant fluctuations. L. sphaerocephala was still the dominant species in succession, and the species composition of the flora was stable. The restoration of vegetation and the development of the entire community are slow. © 2022 Science Press. All rights reserved.