Suppressed Lattice Disorder for Large Emission Enhancement and Structural Robustness in Hybrid Lead Iodide Perovskite Discovered by High-Pressure Isotope Effect

The soft nature of organic–inorganic halide perovskites renders their lattice particularly tunable to external stimuli such as pressure, undoubtedly offering an effective way to modify their structure for extraordinary optoelectronic properties. Here, using the methylammonium lead iodide as a representative exploratory platform, it is observed that the pressure-driven lattice disorder can be significantly suppressed via hydrogen isotope effect, which is crucial for better optical and mechanical properties previously unattainable. By a comprehensive in situ neutron/synchrotron-based analysis and optical characterizations, a remarkable photoluminescence (PL) enhancement by threefold is convinced in deuterated CD₃ND₃PbI₃, which also shows much greater structural robustness with retainable PL after high peak-pressure compression–decompression cycle. With the first-principles calculations, an atomic level understanding of the strong correlation among the organic sublattice and lead iodide octahedral framework and structural photonics is proposed, where the less dynamic CD₃ND₃⁺ cations are vital to maintain the long-range crystalline order through steric and Coulombic interactions. These results also show that CD₃ND₃PbI₃-based solar cell has comparable photovoltaic performance as CH₃NH₃PbI₃-based device but exhibits considerably slower degradation behavior, thus representing a paradigm by suggesting isotope-functionalized perovskite materials for better materials-by-design and more stable photovoltaic application.     

Nanovaccine-Mediated Cell Selective Delivery of Neoantigens Potentiating Adoptive Dendritic Cell Transfer for Personalized Immunization

Neoantigen vaccines and adoptive dendritic cell (DC) transfer are major clinical approaches to initiate personalized immunity in cancer patients. However, the immunization efficacy is largely limited by the in vivo trajectory including neoantigens’ access to resident DCs and DCs’ access to lymph nodes (LNs). Herein, an innovative strategy is proposed to improve personalized immunization through neoantigen-loaded nanovaccines synergized with adoptive DC transfer. It is found that it enables selective delivery of neoantigens to resident DCs and macrophages by coating cancer cell membranes onto neoantigen-loaded nanoparticles. In addition, the nanovaccines promote the secretion of chemokine C-C motif ligand 2 (CCL2), CCL3, and C-X-C motif ligand 10 from macrophages, thus potentiating the access of transferred DCs to LNs. This immunization strategy enables coordinated delivery of identified neoantigens and autologous tumor lysate-derived undefined antigens, leading to initiation of antitumor T cell immunity in a personalized manner. It significantly inhibits tumor growth in prophylactic and established mouse tumor models. The findings provide a new vision for potentiating adoptive cell transfer by nanovaccines, which may open the door to a transformative possibility for improving personalized immunization.     

甘油直接制备丙烯醇的催化剂和反应工艺研究进展

丙烯醇是一种十分重要的中间体和化学原料。近年来，以甘油为原料直接制备丙烯醇的研究引起了许多科学家的关注。本文参考了最近十年来发表的文献，详细介绍了均相甲酸诱导的甘油脱氧脱水反应、催化剂作用下的甘油脱氧脱水反应、液固相甘油氢解反应和气固相甘油氢转移反应等过程制备丙烯醇的相关工艺、反应机理和催化剂的研究进展及发展趋势，并对比了上述工艺的优缺点。其中，均相甲酸诱导的甘油脱氧脱水工艺比较成熟，已经在实验室中得到验证和应用，但是甲酸的消耗量大，整个过程的原子经济性很差。 甘油脱氧脱水反应和液固相甘油氢解反应不仅需要采用价格昂贵的铼基催化剂，而且丙烯醇的选择性较低。 铁基催化剂作用下的气固相甘油氢转移反应制备丙烯醇，由于催化剂的价格低廉、制备工艺简单、产品分离容易等优势而备受关注，是最近五年的研究热点。在文献基础上，认为今后研究应该重点关注催化剂的酸碱性、氢转移能力及其与速率控制步骤的匹配，并有针对性地对催化剂进行优化和改进。     

行车取力发电调速系统集成与散热设计

行车取力发电系统由泵控马达液压基本回路实现恒转速输出,可持续带动30kW大功率电负载。但因装备汽车底盘空间有限、散热条件较差,系统在投入使用前,对现有实验系统进行了集成化设计,综合考虑集成块布局、装车条件、战场环境等多种要素影响,基于AMEsim软件平台,建立系统仿真模型,分析液压系统热载荷分布,指导散热系统的设计。     

Effect laws and mechanisms of different temperatures on isothermal tensile fracture morphologies of high-strength boron steel

The fracture behaviour and morphologies of high-strength boron steel were investigated at different temperatures at a constant strain rate of 0.1 s-1 based on isothermal tensile tests. Fracture mechanisms were also analyzed based on the relationship between microstructure transformation and continuous cooling transformation(CCT) curves. It is found that 1) fractures of the investigated steel at high temperatures are dimple fractures; 2) the deformation of high-strength boron steel at high temperatures accelerates diffusion transformations; thus, to obtain full martensite, a higher cooling rate is needed; and 3) the investigated steel has the best plasticity when the deformation temperature is 750 °C.     

Industrial TiO2 based nacreous pigments as functional building materials: Photocatalytic removal of NO

In this paper, the photocatalytic activity of industrial titanium dioxide (TiO₂) based nacreous pigments was researched as functional building materials for photocatalytic NO remove. Three industrial TiO₂ based nacreous pigments were selected to estimate the photocatalytic activity for NO remove. This study is a good proof that pearlescent pigments can eliminate NO, and its performance is positively correlated with its titanium dioxide content. And this research will widen the application of nacreous pigments in functional building materials, and provide a new way to eliminate in door nitric oxide pollution.     

小煤柱沿空掘巷锚网索与单体支柱联合支护

介绍了锚网索加单体走向棚支护技术在小煤柱沿空掘巷工作面的成功实践,并就该技术在掘进期间的矿压显现规律作了分析,证明了其支护的可行性与经济适用性。     

境内外矿业资本市场信息发布差异研究：以三道庄钼矿为例

矿产资源作为矿业公司持有使用权的核心资产,由于境内外矿业资本市场要求不同,因此境内外发布的矿产资源信息存在较大差异。洛阳钼业是香港交易所和上海证券交所双重上市的矿业公司,根据香港交易所要求,由胜任人按照JORC规则发布独立技术审查报告;根据上海证券交易所等要求,按照我国标准编制核实报告并通过评审备案后,将其作为A股招股说明书的所载内容公开发布。本文以洛阳钼业所属上市资产三道庄钼矿为例,以公开的矿产资源信息为切入点,对境内外首发上市的矿产资源信息发布路径、发布内容以及矿产资源储量对比分析,认为境内外证券交易所矿产资源信息发布要求、采纳的矿产资源储量分类标准和矿产资源储量估算认定体系等要素是导致信息发布存在差异的主要原因,总结了矿业资本市场信息发布差异带来的三点启示,为完善我国矿业资本市场发展,促进矿业行业国际互联互通提供实证。