关于复射影空间中全实极小子流形的注记

本文给出发射影空间中全实极小子流形曲率拼挤（Pinching）的几个定理，它们分别改进了沈一兵教授的有关Pinching定理。     

民族地区中小学图书馆室建设探索

人们对中小学校图书馆室等基础功能设施建设重视不够。文章从图书馆室的装备、管理和效益三个方面,结合民族地区的特点和教育现状,提出了民族地区中学小校图书馆室建设和管理模式,供当地教育行政部门和学校参考。     

Tandem Biocatalysis by CotA-TJ102@UIO-66-NH2 and Novozym 435 for Highly Selective Transformation of HMF into FDCA

2,5-Furandicarboxylic acid(FDCA) is a potential biorenewable chemical for applications including plastics, polyamides, drugs, etc. The selective biosynthesis of FDCA from 5-hydroxymethylfurfural(HMF) by a specific enzyme poses a great challenge. In this study, we reported an efficient strategy to produce FDCA from HMF by the tandem biocatalysis of laccase(Cot A-TJ102@UIO-66-NH_2) and Novozym 435. For the first step, a nanoparticle metal–organic framework was synthesized as a carrier to immobilize Cot A-TJ102@UIO-66-NH_2, which was assigned for the production of 5-formyl-2-furancarboxylic acid(FFCA) and featured an enzyme loading of 255.54 mg/g, specific activity of 135.90 U/mg, and solid loading ratio of 99.65%. Under optimal conditions, an ideal FFCA yield of 98.5% was achieved, and the Cot A-TJ102@UIO-66-NH_2 presented a high recycling capacity after 10 cycles. For the second step, Novozym 435 was applied for the further conversion of FFCA into FDCA, presenting a high FDCA yield of 95.5% under the optimized conditions. Novozym 435 also exhibited a high recyclability after eight cycles. As a result, the tandem biocatalysis strategy provided a 94.2% FDCA yield from HMF, indicating its excellence as a method for FDCA production.     

Ecological Mural as Community Reconnection

Murals are particularly visually captivating forms of public art due to their size and accessibility. Mural images also capture public attention and provoke viewers to explore layers of meaning and find hidden stories. They are often in places that people come to visit, study, play, congregate and discuss matters that may relate to the content of the mural. To this end, murals can be effective tools for helping communities think about their environmental issues. This article discusses the Mystic River mural project in Somerville, Massachusetts, USA. It addresses how the local art councils, mural artists, local students, community members and non‐profit organisations collaborated to carry out this ongoing mural project. The purpose of this research is to examine how Mystic River eco‐murals were created, what challenges and benefits the eco‐murals provided, how local social concerns were represented through the eco‐murals, how eco‐murals can continue to promote environmental awareness and inspire youth about their community and the local environment, and how the mural can continue to reflect or affect the meaning of the place. This process can serve as an example for other communities that seek to address their environmental concerns through public art.     

就业、创业教育模式新探——以赛扶教育为例

赛扶又称＂全球大学生企业家联盟＂,是一个全球性的大学生公益创业实践组织,对大学生的创业、就业素质培养和实践教育具有重要作用。探求赛扶组织成功的奥秘,用心理学、教育学的方法配合调查问卷结果分析其利用社会资源,构建就业、创业教育实践平台模式;体验式就业、创业教育的模式;创业精英意识培养的模式,并对现在的就业、创业教育中的瓶颈问题提出可行性方案,可以帮助学生更好地进行创业、就业。     

大学生特殊群体体育权利保护的研究

体育权利是实现人们身心健康的权利,是一项基本人权.根据国际人权公约和各国 残疾人保护法,以及各国立法的成功经验,结合我国高校特殊群体学生的体育教学工作实 际,就保护特殊群体学生体育权利的问题,提出立法建议:建立特殊群体体育权保护法;完 善体育权保护法律条文;制定配套相关法规;强化法律实施监督;加强普法教育活动.以进 一步规范和完善大学生特殊群体体育权法律制度,确保特殊群体学生的体育权利能得以充 分实现,使其获得身心的全面、协调、健康发展.     

《电力电子学》多媒体交互式虚拟实验的实现技术

该文介绍了针对大学本科基础专业课程《电力电子学》教学课件中虚拟实验的实现技术。Flash软件的ActionScript是一种面向对象的编程方法,通过Flash深入编程,该研究实现了由JAVA编程达到的虚拟试验效果,同时探索了严格意义上的交互式虚拟课件的技术实现方法。     

非税收入规范化管理研究

非税收入是政府收入体系的一个有机组成部分。我国非税收入管理的突出问题是数额大,征收主体多元化,管理规范性差,带来严重负面效应。本文在分析上述问题形成原因的基础上,提出改革和规范我国非税收入管理的思路,即对非税收入的不同种类区别对待,分流归位,依法立项,建立和完善规范化征管体系,并以治本为目的实施财政、行政、法制、投融资等方面的配套改革,文中还就此提出了一系列具体措施建议。     

Simple Preparation of Spherical Activated Carbon with Mesoporous Structure from Phenolic Resol and Associated Catalytic Performance in Isobutane Dehydrogenation

This study provides a detailed report on the synthesis of spherical activated carbon with mesoporous structure using a soluble low molecular weight phenolic resol precursor through an ammonium alginate assisted sol–gel method. The effects of calcinating temperature and the addition of CaCO_3 as a pore-enlarging agent on texture structure and catalytic performance in isobutane dehydrogenation to isobutene were investigated. Characterization of N_2 sorption,mechanical strength tests,and optical photographs confirmed that the obtained carbon materials had high mechanical strength,a good degree of sphericity,and a large surface area. Introducing CaCO_3 as a pore-enlarging agent during the preparation process promoted the formation of a mesoporous structure of carbon spheres and evidently increased the surface area and oxygen content,which can improve isobutane conversion and isobutene selectivity of these carbon spheres. The conversion of isobutane reached up to 28% for this spherical activated carbon,and the selectivity of isobutene reached up to 96%. Isobutane conversion increased with an increase in calcination temperature due to an increase in the oxygen content,whereas the selectivity of isobutene decreased due to the slight decrease in the specific surface area.     

试论区域科技创新体系的构建与推进

文章论述了构建区域科技创新体系应遵循的基本原则,并根据相关原则及各子系统的功能和相互关系构筑了区域科技创新体系组织结构的框架模型,即认为:区域科技创新体系包括两个层次、六个子系统。最后提出了推进区域科技创新体系建设的一些对策措施。