Extraterrestrial artificial photosynthetic materials for in-situ resource utilization

Aerospace milestones in human history, including returning to the moon and manned Martian missions, have been implemented in recent years. Space exploration has become one of the global common goals, and to ensure the survival and development of human beings in the extraterrestrial extreme environment has been becoming the basic ability and technology of manned space exploration. For the purpose of fulfilling the goal of extraterrestrial survival, researchers in Nanjing University and the China Academy of Space Technology proposed extraterrestrial artificial photosynthesis (EAP) technology. By simulating the natural photosynthesis of green plants on the Earth, EAP converts CO₂/H₂O into fuel and O₂ in an in-situ, accelerated and controllable manner by using waste CO₂ in the confined space of spacecraft, or abundant CO₂ resources in extraterrestrial celestial environments, e.g. Mars. Thus, the material loading of manned spacecraft can be greatly reduced to support affordable and sustainable deep space exploration. In this paper, EAP technology is compared with existing methods of converting CO₂/H₂O into fuel and O₂ in the aerospace field, especially the Sabatier method and Bosch reduction method. The research progress of possible EAP materials for in-situ utilization of extraterrestrial resources are also discussed in depth. Finally, this review lists the challenges that the EAP process may encounter, which need to be focused on for future implementation and application. We expect to deepen the understanding of artificial photosynthetic materials and technologies, and aim to strongly support the development of manned spaceflight.     

X射线荧光光谱法测定重金属元素的实验研究

以大庆市北二十里泡为例,研究典型城市湿地沉积物重金属污染.在用X射线荧光光谱法测定沉积物中的重金属时,为检测实验分析的可靠性,随机抽取了10个样品做5次重复实验,其中Cd、Hg、Cr、Zn的相对标准偏差均小于5%,Cu和Pb的相对标准偏差均小于10%,Cr和Ni的相对偏差均小于20%.与化学法相比,X射线荧光法不需对固体样品进行消化处理,操作简便,可以同时测定多种元素,取得了与传统方法相一致的分析准确性和重复性.实验表明,此种方法测定沉积物中重金属是可行的.     

政府、行业在高职教育办学活动中的角色定位及关系分析

高职教育是以培养生产、建设、管理、服务第一线的技术应用型人才为目标,为承接世界制造中心在我国的凸现提供重要的人才保障.高职教育的内在性质和作用又决定着政府、行业在其办学活动中扮演着重要角色.文章循着这一思路,着重明晰了政府、行业在高职人才培养中的角色定位,阐明了它们与学校三者的间性关系.     

谈WTO环境下的专利信息检索

随着知识经济的迅猛发展和我国加入WTO，知识产权在经济发展中的地位与作用越来越重要。面对国内外市场一体化的激烈竞争和国际统一市场规则的约束，我们必须提高对知识产权的认识，增强全民的专利意识，加强对专利的开发、运用和保护。本文探讨了WTO环境下专利文献的作用及网上中外专利文献的检索与利用。     

运动协调的属性及其相关概念的理论研究

文章采用文献资料法、系统分析法对运动协调的属性进行了理论研究,并对相关概念进行了界定与区分。研究结果认为,运动协调应同时具有生理、心理和社会属性。运动协调从属于运动技能,运动协调与运动技术、运动素质都是交叉关系。研究结果对运动协调的教学与训练具有重要指导意义。     

Optimal design of Stewart platforms based on expanding the control bandwidth while considering the hydraulic system design

We proposed an optimal design method to expand the bandwidth for the control of large hydraulic Stewart platform. The method is based on generalized natural frequency and takes hydraulic oil into consideration. A Lagrangian formulation which considers the whole leg inertia is presented to obtain the accurate equivalent mass matrix. Using the model, the effect of leg inertia and the influence of design parameters on the generalized natural frequency are investigated. Finally, numerical examples are presented to validate and confirm the efficiency of the mathematical model. The results show that the leg inertia, especially the piston part plays an important role in the dynamics. The optimum diameter ratio of the base to the moving platform is between 2 and 3, and the optimum joint angle ratio of the base to the moving platform is about 1. The smaller joint angles and a longer leg stroke are favorable for raising system frequencies. The system oil should be preprocessed for large platforms with a requirement for good dynamic performance.     

在反腐工作中加强行政监督的必要性及措施

从社会主义初级阶段的特征和行政监督在实践“三个代表”中的重要作用,阐述了现阶段加强行政监督的必要性,并从行政监督主体与对象、行政监督的事后性、树立全员监督思想等方面论述了加强行政监督的具体措施。     

儿童攻击性行为的成因及教育策略探析

攻击性行为,又称侵犯行为(Aggressive Behavior),指个体采取的使他人受损失或不舒服的行为,包括殴打、侮辱、抢夺和损坏他人财物等霸道行为.[1]攻击性行为是儿童在身心发展过程中,其人际关系还没有形成良好的社会适应时所表现出来的不良行为;具有不良行为的儿童往往不积极参与活动,并且在活动中很难集中精力,导致各方面的能力很难发展.     

高校辅导员培养学生成长的几点思考

大学生在高校的学习、生活中能够全面发展、不断进步、顺利成才受到多种因素的影响。本文从辅导员工作的开展着眼,简要阐述了辅导员老师在大学生正确人生观、价值观和政治思想觉悟树立以及专业知识学习中发挥的突出作用,指出辅导员的监督与支持以及自身修养的提高在大学生成长成才中发挥重要影响。