园长专业化知识基础的构成与发展途径

园长以整个幼儿园为工作对象和活动范围,集领导者、管理者和教育者三种职业角色于一身.为全面保证幼儿园工作的顺利开展,园长应具备特殊的知识与能力.其中,知识是园长专业化的重要基础和前提条件.园长专业化应具备的知识基础主要由本体性知识、条件性知识、实践性知识和广博的科学文化知识构成,其发展途径主要包括园长个体的自我更新、群体知识分享和专业化培训.     

个人意义在外部动机内化过程中的作用探析

外部动机的内化是学校教育情境中激发学生学习动机的一条重要路径。基于自我决定动机理论,可关注外部动机内化的不同类型及意义,认识外部动机内化的实质与机制,揭示个人意义在促进外部动机内化中的作用。为此,教师应给予学生自主支持,引导学生生成具有建设性的理由和进行高水平的内化。     

加强学科建设 实现跨越式发展

黑龙江科技学院矿物加工学科面向区域经济，突出矿业特色，提升实验条件，研发科技成果，建设成黑龙江省级重点学科，实现了学科建设的跨越式发展。     

语言的魔咒——关于人际传播的新思考

从拉康的思想出发,语言代替理性控制了人际传播的主体.主体间的交流就不再为自身而展开,也不为对方而展开,只为他们所归属的语言系统而展开.在实践中,主体间只有通过象征才能实现真正的交流,这种象征是语言的内部因素能指具有的基本功能.因此,追根究底的说,主体间的交流只为语言能指的象征存在而展开.     

提高农业昆虫学实验教学质量的探索

实验教学是农业昆虫学教学中的重要组成部分,为了根除传统实验教学存在的弊端,可从提高教师队伍的素质、激发学生的学习兴趣入手,通过更新教学方式、完善实验考核制度等手段,提高学生运用所学知识解决问题的能力,增强学生的创新意识,从而提高教学质量。     

微生物教学实验室生物安全的探索与研究

安全稳定是当今高校快速发展的根本保障,是建设和谐校园、平安校园的切入点和着力点。北京工业大学生命科学与生物工程学院微生物教学实验室,是伴随招收生物技术研究方向的本科生而诞生的专业基础教学实验室。由于教学和科研的密切关系,在病毒与药理研究室生物安全实践的基础上,从微生物教学实验室的特点等4个方面,对微生物教学实验室的生物安全问题进行有益的探索与研究,不仅提升师生的安全意识,同时有效促进实验教学的改革和创新。     

Enabling Mg metal anodes rechargeable in conventional electrolytes by fast ionic transport interphase

Rechargeable magnesium batteries have received extensive attention as the Mg anodes possess twice the volumetric capacity of their lithium counterparts and are dendrite-free. However, Mg anodes suffer from surface passivation film in most glyme-based conventional electrolytes, leading to irreversible plating/stripping behavior of Mg. Here we report a facile and safe method to obtain a modified Mg metal anode with a Sn-based artificial layer via ion-exchange and alloying reactions. In the artificial coating layer, Mg₂Sn alloy composites offer a channel for fast ion transport and insulating MgCl₂/SnCl₂ bestows the necessary potential gradient to prevent deposition on the surface. Significant improved ion conductivity of the solid electrolyte interfaces and decreased overpotential of Mg symmetric cells in Mg(TFSI)₂/DME electrolyte are obtained. The coated Mg anodes can sustain a stable plating/stripping process over 4000 cycles at a high current density of 6 mA cm⁻². This finding provides an avenue to facilitate fast ion diffusion kinetics of Mg metal anodes in conventional electrolytes.     

太极拳桩功对改善骨盆前倾的作用

在现代信息化生活中,网络已全面侵入我们的日常生活,儿童少年乃至老年人都在使用手机、电脑。由于长期不良的久坐姿势会造成人体形态的改变。其中在青年人中骨盆前倾尤为常见。本文主要运用文献法、问卷调查法从造成骨盆前倾的原因及对人体的危害上进行阐述,引起人们重视,继而提出卷腹运动、太极拳桩功对骨盆前倾的改善方法。     

Injectable hybrid inorganic nanoscaffold as rapid stem cell assembly template for cartilage repair

Cartilage injuries are often devastating and most cannot be cured because of the intrinsically low regenerative capacity of cartilage tissues. Although stem-cell therapy has shown enormous potential for cartilage repair, the therapeutic outcome has been restricted by low survival rates and poor chondrocyte differentiation in vivo. Here, we report an injectable hybrid inorganic (IHI) nanoscaffold that facilitates fast assembly, enhances survival and regulates chondrogenic differentiation of stem cells. IHI nanoscaffolds that strongly bind to extracellular matrix (ECM) proteins assemble stem cells through synergistic 3D cell–cell and cell–matrix interactions, creating a favorable physical microenvironment for stem-cell survival and differentiation in vitro and in vivo. Additionally, chondrogenic factors can be loaded into nanoscaffolds with a high capacity, which allows deep, homogenous drug delivery into assembled 3D stem-cell-derived tissues for effective control over the soluble microenvironment of stem cells. The developed IHI nanoscaffolds that assemble with stem cells are injectable. They also scavenge reactive oxygen species and timely biodegrade for proper integration into injured cartilage tissues. Implantation of stem-cell-assembled IHI nanoscaffolds into injured cartilage results in accelerated tissue regeneration and functional recovery. By establishing our IHI nanoscaffold-templated 3D stem-cell assembly method, we provide a promising approach to better overcoming the inhibitory microenvironment associated with cartilage injuries and to advance current stem-cell-based tissue engineering.     

MPI下矩阵相乘的实现与分析

随着多核处理器及并行计算机的发展,并行程序设计在高性能计算及进程通信等领域得到更广泛的应用。而MPI(Message Passing Interface消息传递接口)作为目前最重要的并行编程工具,提供了丰富的消息传递库函数,极大方便了并行算法的实现。本文首先介绍并行计算及MPI的基本内容,然后在MPI并行计算环境下实现了一种n×n阶矩阵相乘的并行算法,并与传统的串行算法进行了性能方面的分析和比较。