网络时代大学生职业素养的培养途径分析

良好的职业素养是大学生竞争力形成、成功入职的关键。网络时代大学生职业素养的培养面临着一系列问题,与高等教育宗旨相背离。正确认识高等教育的最终价值,营造育人环境,配置职业素养良好的师资队伍,合理设置课程,改革对学生的考评方式,建构大学生向职业人转换的平台,以网络立法净化网络环境,用网络资源培养大学生的信息素养是可行的。     

Pollination: self-fertilization strategy in an orchid

Mating in flowering plants normally relies on animals, wind, gravity or secretion to convey pollen grains from the male (anther) to the female (stigma) organ. Here we describe a new type of self-pollination mechanism in the tree-living orchid Holcoglossum amesianum, in which the bisexual flower turns its anther against gravity through 360 degrees in order to insert pollen into its own stigma cavity - without the aid of any pollinating agent or medium. This mode of self-pollination, which occurs under windless, drought conditions when insects are scarce, adds to the variety of mechanisms that have evolved in angiosperms to ensure their reproductive success.     

New anomalocardid frontal appendages from the Guanshan biota, eastern Yunnan

Anomalocaridids were large predators of the Cambrian seas at the top of the trophic pyramid. Complete anomalocaridid specimens have been rarely discovered and the rigid isolated frontal appendages and mouthparts are more commonly preserved. Here we study new material of the frontal appendages from the Wulongqing Formation, Cambrian Stage 4, Series 2 near Kunming, eastern Yunnan. Two new forms of anomalocaridid frontal appendages are described, namely Anomalocaris kunmingensis sp. nov. and Paranomalocaris multisegmentalis gen. nov., sp. nov. The frontal appendage of A. kunmingensis sp. nov. probably comprises 15 podomeres of which the first one has a weakened skeletoned, the second one is armed with small spines, and the third one is armed with remarkably robust proximal ventral spines with 6 anisomerous auxiliary spines; paired auxiliary spines are associated with podomeres 4–14; podomeres 12–14 are armed with paired dorsal spines, and the last podomere bears 2 distal spines, one spine distinctly larger than the other. The frontal appendage of P. multisegmentalis tapered backwards, consisting of 22 visible podomeres; the most ventral spine is armed with 5 pairs of auxiliary spines, and podomeres 12–21 bear dorsal spines, the last podomere with 2 small distal spines. The new material provides additional evidence for our understanding of the diversity of anomalocaridids in the Cambrian. The morphology of these new finds may indicate the importance of different feeding strategies of anomalocaridids in the Cambrian ecosystem.     

综放工作面防灭火技术探究

综放工作面采空区残留浮煤多,容易发生自然发火.霍州煤电集团晋北煤业公司山浪煤矿5-101综放工作面采用注氮、束管监测、喷洒阻化剂、防火密闭墙等综合防灭火手段,以预防采空区自然发火,收到了很好效果.     

城市小区CATV网交互业务的实现

数字电视的出现使交互电视成为电视发展的一个重要方向,我国拥有世界上最大的有线电视用户数,交互电视的发展能充分满足广大民众的文化生活需求,也必将成为社会经济新的发展热点．作者以数字视频广播(DVB)项目所建立的数字电视广播相关技术框架为技术基础,结合我国小区有线电视(CATV)发展的实际情况,分析并提出了一种行之有效的CATV网交互系统模型,可以迅速便利地实现多种交互式CATV业务．     

飞行器乘波前体/Bump型面优化设计方法研究

飞行器前体和Bump型面是乘波体思想在飞行器部件设计中的两大经典案例,可有效提升飞行器总体气动性能,已经成为飞行器总体设计的核心技术。为寻求乘波前体和Bump型面的最优设计以提升飞行器设计效率,提出了一种可应用于乘波前体和Bump型面的优化设计方法。采用密切锥理论和圆锥绕流流场生成初始的乘波前体和Bump型面,并通过面元法快速预估气动性能;结合BP神经网络建立的代理模型和遗传算法NSGA-II对乘波前体和Bump型面快速优化;利用数据挖掘方法分析乘波前体和Bump型面的流动机理。优化后的乘波前体升阻比提升了25.6%,体积提升41.4%。Bump型面阻力系数减少10.9%,横向压力梯度增加12.1%。研究结果表明,提出的优化方法能够有效应用于乘波前体和Bump气动型面的设计优化,对飞行器整体气动性能的优化具有指导意义,在工程应用中具有重大潜力。     

生态社会主义对社会主义经济体制的设计

生态社会主义认为传统社会主义经济体制在环境保护上是优于资本主义的,传统社会主义经济体制在保护环境上存在着积极作用和消极作用的两重性,增长的极限与道德沦丧的同时出现是传统社会主义失败的原因.市场社会主义既不利于实现社会主义的原则和目标,又不利于环境保护.只有以具体劳动和满足人们需要为标准来组织生产的生态社会主义,才能将社会主义的原则目标与环境保护结合起来.     

同高连续数对的无限性

指出了Collatz猜想中,某些连续的整数串具有相同的高,专门研究了同高连续数对,提出了它是通过利用一个算法从数的奇偶矢量重建数的轨迹来实现的.研究发现同高连续数对在自然数中有无限多对,这是以前研究Collatz猜想未注意到的.