MPEGAA-AA-AMPS高效减水剂对水泥浆料性能影响

采用自制的MPEGAA-AA-AMPS高效减水剂和P(AA-co-MA)/PEG、FDN-A减水剂,以不同掺量掺入P.O 42.5普通硅酸盐水泥,运用混凝土外加剂匀质性试验方法和水泥胶砂强度检验方法,研究不同掺量对水泥净浆流动度、水泥砂浆减水率、水泥净浆泌水率以及水泥砂浆的抗压强度等性能的影响,并利用电镜对添加MPEGAA-AA-AMPS高效减水剂的硬化水泥石的内部结构进行表征。结果显示,MPEGAA-AA-AMPS高效减水剂掺量为1.0%时,水泥净浆流动度达322 mm,砂浆减水率为47%,泌水率仅1.1%,28 d水泥胶砂抗压强度可达67.9 MPa。可见MPEGAA-AA-AMPS高效减水剂无论对水泥净浆或水泥砂浆的分散能力、保水性能和减水作用,还是对力学强度均有明显优势。从水泥石的内部结构SEM图看,添加MPEGAA-AA-AMPS高效减水剂后更能保证水泥石的抗压强度和经时耐受力。     

浅析《为奴隶的母亲》中女主人公的三重角色

《为奴隶的母亲》是柔石最优秀的短篇小说,标志着作者的艺术视野开始从青年知识分子转向社会下层劳动人民的生活。小说成功地刻画了一个名为母亲实为奴隶的悲剧形象,她已经不被当做有生命、有灵魂、有意志的人,被剥夺了做母亲、做妻子的权利,只被当做可供买卖的物品。作品控诉了在"典妻"制度下封建阶级对于农村妇女的残酷压榨和欺凌,这是继鲁迅《祝福》之后,反映被侮辱被损害的劳动妇女的血泪生活的又一力作。     

母权制时期女性文化解说——以亲属称谓研究为中心

亲属称谓以其独具特色的社会文化媒介向人们传递出自身蕴藏着的巨大历史信息。通过分析、比较发现:亲属称谓能够揭示出母系血亲称谓关系早于父系血亲称谓关系;亲属称谓体现了上古时期女性的崇高地位;亲属称谓能传递出上古时期的婚俗信息;亲属称谓亦能够佐证女性地位逐步下降这一过程。研究者对亲属称谓反映母权制时期女性文化信息要有一个"度"的把握,不能一味夸大其作用,但也不能盲目否定亲属称谓自身所蕴藏的文化信息。     

论黄遵宪晚年的民族战争思想

黄遵宪晚年坚决主张以民族战争维护国家主权和领土完整,体现了他的"尚武"思想。他深入反思了清政府的对外战争以及国防建设,强调要打有准备的民族战争。他还认为,良好的外交工作将有助于民族战争的胜利。黄遵宪的"尚武"思想是近代世界民族国家弱肉强食背景下的无奈选择,他更崇尚睦邻友好与国家间的和平共处。     

数字化时代的家庭教育新挑战及立法回应

数字化时代给家庭教育带来新的挑战,扩大了家庭教育上的数字鸿沟,造成了家庭教育上的数字代沟,突显了未成年人参与权、发展权与受保护权之间的张力,且放大了未成年人权利与父母权益之间的矛盾。《中华人民共和国家庭教育促进法》作为世界上第一部专门的家庭教育国家立法,回应了数字化时代的家庭教育新问题。它提倡数字化时代的亲子观和家庭观,直面家长的家庭教育数字素养问题,初步构建了线上线下融合的家庭教育指导服务体系。该法的实施尚需配套制度的跟进,当务之急是设计提升家长数字素养的课程体系,完善家庭教育指导者职业准入和加强新时代家庭教育学学科建设。     

广东省女子摔跤队冬训期训练特征研究

采用文献资料法、专家访谈法、观察法等研究方法,对广东省女子摔跤队2020-2021冬训期训练阶段的划分、训练内容、训练方法以及训练负荷等训练特征进行研究。研究显示:广东省女子摔跤队冬训期共29周,分为基础与提升阶段、强化阶段与赛前阶段;训练内容主要围绕体能训练与技战术训练开展,通过先“扬长”后“补短”,全面提升运动员竞技能力水平;训练方法使用丰富合理,具有专项化特征;训练负荷与训练内容联系紧密,张弛有度,呈现出波浪式变化的特征。     

Scientific reasoning in elementary school children: Assessment and relations with cognitive abilities

The primary goal of this study was the broad assessment and modeling of scientific reasoning in elementary school age. One hundred fifty-five fourth graders were tested on 20 recently developed paper-and-pencil items tapping four different components of scientific reasoning (understanding the nature of science, understanding theories, designing experiments, and interpreting data). As confirmed by Rasch analyses, the scientific reasoning items formed a reliable scale. Model comparisons differentiated scientific reasoning as a separate construct from measures of intelligence and reading skills and revealed discriminant validity. Furthermore, we explored the relationship between scientific reasoning and the postulated prerequisites inhibitory control, spatial abilities and problem-solving skills. As shown by correlation and regression analyses, beside general cognitive abilities (intelligence, reading skills) problem-solving skills and spatial abilities predicted performance in scientific reasoning items and thus contributed to explaining individual differences in elementary school children's scientific reasoning competencies.     

Attachment,self-esteem and test anxiety in adolescence and early adulthood

The purpose of this study was to assess how attachment dimensions (anxiety and avoidance), self-esteem, and three subscales of test anxiety – cognitive obstruction, social derogation and tenseness are related in two age groups: adolescents and college students. Participants (N?=?327) completed relevant questionnaires. Results showed that college students revealed higher test anxiety than did high school students on the cognitive obstruction and tenseness scales, whereas high school students revealed higher social derogation than college students. Anxious attachment was related to all three sub-scales of test anxiety and avoidant attachment was related to cognitive obstruction among college students and to tenseness among high school students. Most of the correlations between anxious attachment and test anxiety were mediated by self-esteem among high school students. The mediation ability of self-esteem was weaker among college students.     

经济全球化时代中国传统文化转型的哲学思考

经济全球化趋势日益加强,影响着中国经济的建设和发展,在某种意义上渗透或拓展到政治和文化领域。在经济全球化时代背景下,探讨中国传统文化转型问题具有一定的现实意义。