电动叉车驱动机构的设计改进

对2吨位电动叉车的驱动装置进行了结构设计改进,取消了独立的减速装置而将其功能分配到齿轮传动系统中,改进后的设计具有结构紧凑、传动效率高等特点．通过COSMOSWorks有限元分析实例解析,证明驱动机构的结构强度和刚性满足设计要求．     

垃圾焚烧发电厂燃烧控制及环保排放的研究

我国垃圾水分大、热值低、灰分大、成分复杂,焚烧炉燃烧控制不可控因素多,结合TIF-CFB特点,从垃圾品质、助燃煤成分、过量空气系数、负荷变化等参数分析影响垃圾燃烧稳定性的因素,对垃圾焚烧中产生的二恶英、重金属、酸性气体、固体废物等进行解析利于有针对性地防治,可实现垃圾发电最大的环境效益。     

Social,emotional and intercultural competencies: a literature review with a particular focus on the school staff

Framed by the EU-project Hand in Hand focusing on Social, Emotional and Intercultural (SEI) competencies among students and school staff the paper discusses implementation and professional competencies based on a literature review. Five themes were identified: 1) Intercultural/transcultural competency is not often referred to in the same research as social-emotional learning, though socio-emotional aspects appear to be `in the core´, 2) it is crucial to be aware of agency among school staff in a SEI-implementation, 3) successful implementation is about more than the activities in the specific program, it is rather about elements in synergy and professional learning over time, 4) the subtle balance between adaptation and fidelity might best be addressed in an adaptive curriculum emphasizing active ingredients, and 5) this is a field with many intervention studies, but it is urgent to consider if the psychometric measures are sufficiently sensitive to catch the subtle changes related to SEI-competencies.     

纳米材料的研究进展

由于纳米微粒的小尺寸效应、表面效应、量子尺寸效应和宏观量子隧道效应等使得它们在磁、光、电、敏感等方面呈现常规材料不具备的特性,因此其在磁性材料、光学材料、电子材料以及高致密度材料的烧结、传感、催化、陶瓷增韧等方面有广阔的应用前景,目前研究者颇多.本文主要从纳米材料制备与表征的方法以及纳米材料的应用方面总结了近几年来纳米材料的研究进展.     

中国城镇化与资源环境承载力耦合关系研究

运用耦合度和耦合协调度模型,研究了全国及各省区城镇化与资源环境承载力的耦合关系,得出如下结论:第一,全国及大部分省区城镇化水平超出资源环境的承载水平,资源环境承载力对城镇化的支撑能力有限;第二,全国及各省区城镇化与资源环境承载力处于拮抗阶段,二者的相互作用关系比较剧烈,既存在胁迫效应,也存在约束作用;第三,城镇化与资源环境承载力耦合协调度呈现东部>西部>中部的空间格局,全国属于轻度失调型,大部分省区属于轻度和中度失调型。提出如下对策建议:在新常态下推进城镇化适度适速发展、创新“土地红利”模式;以生态文明建设为契机实现资源可持续利用、加强环境污染治理、构筑生态安全屏障。     

Superconductivity in chromium nitrides Pr3Cr10-xN11 with strong electron correlations

Exploration of superconductivity in Cr-based compounds has attracted considerable interest because only a few Cr-based superconductors (CrAs, A₂Cr₃As₃ and ACr₃As₃ (A = K, Rb, Cs, Na)) have been discovered so far and they show an unconventional pairing mechanism. We report the discovery of bulk superconductivity at 5.25 K in chromium nitride in Pr₃Cr_10-xN₁₁ with a cubic lattice structure. A relatively large upper critical field of H_c2(0) ∼ 12.6 T is determined, which is larger than the estimated Pauli-paramagnetic pair-breaking magnetic field. The material has a large electronic specific-heat coefficient of 170 mJ K⁻² mol⁻¹—about 10 times larger than that estimated by the electronic structure calculation, which suggests that correlations between 3d electrons are very strong in Pr₃Cr_10-xN₁₁, and thus quantum fluctuations might be involved. Electronic structure calculations show that the density of states at the Fermi energy are contributed predominantly by Cr 3d electrons, implying that the superconductivity results mainly from the condensation of Cr 3d electrons. Pr₃Cr_10-xN₁₁ represents a rare example of possible unconventional superconductivity emerging in a 3D system with strong electron correlations. Nevertheless, clarification of the specific pairing symmetry needs more investigation.     

增强广东自主创新能力的对策研究

提高自主创新能力是实现广东经济社会发展战略性转型的关键。广东具有强大的科技产出能力,高新技术产业规模大、水平高,但也存在教育人才基础薄弱、重大原始创新能力差、技术对外依赖性强等问题。本文分析广东自主创新能力现状特点与存在问题,提出了广东中长期提高科技自主创新能力的战略目标和对策建议。     

ChatGPT对科普场馆数字化转型的应用机遇和挑战

本研究聚焦于ChatGPT,加强科普场馆在数字化建设中对ChatGPT的整体认知,期待通过对此类新型人工智能技术的应用,为科普场馆开展数字化转型服务提供参考与借鉴。通过分析ChatGPT 的发展历程、技术特征、技术应用及应用方式,在ChatGPT系统实践的基础上,总结ChatGPT为科普场馆数字化转型带来的机遇,包括在科普场馆协助研究、数字展览、智能客服等方面的效率提升和赋能,同时探讨了ChatGPT带来的风险挑战,包括内容科学性、信息安全性、使用目的性、依赖性以及法律法规问题,并针对性地给出了相应对策。     

谁在主导中日韩的国际科学合作?

[目的/意义]为了探究中日韩的国际科学合作中的主导地位及变化趋势。[方法/过程]以"中日"、"中韩"和"中日韩"国际论文合著现象为分析对象,通过科学计量的方法和手段,从重要作者、高影响力论文和资助者三个维度来分析近40年来中日韩科学合作背后的主导力量。[结果/结论]研究结果发现中日科学合作呈现出日本主导趋势由强到弱,而中国主导趋势渐强并超过日本;中韩科学合作呈现双方共同主导的特征;在三国合作中,中国主导的论文影响力较强,但随着论文影响力的增大,中国显示出的主导优势却在减弱;中国作为科研资助者极大地推动了三国的科学合作。