Z-Scheme Modulated Charge Transfer on InVO4@ZnIn2S4 for Durable Overall Water Splitting

The charge transfer within heterojunction is crucial for the efficiency and stability of photocatalyst for overall water splitting (OWS). Herein, InVO₄ nanosheets have been employed as a support for the lateral epitaxial growth of ZnIn₂S₄ nanosheets to produce hierarchical InVO₄@ZnIn₂S₄ (InVZ) heterojunctions. The distinct branching heterostructure facilitates active site exposure and mass transfer, further boosting the participation of ZnIn₂S₄ and InVO₄ for proton reduction and water oxidation, respectively. The unique Z-scheme modulated charge transfer, visualized by simulation and in situ analysis, has been proved to promote the spatial separation of photoexcited charges and strengthen the anti-photocorrosion capability of InVZ. The optimized InVZ heterojunction presents improved OWS (153.3 µmol h⁻¹ g⁻¹ for H₂ and 76.9 µmol h⁻¹ g⁻¹ for O₂) and competitive H₂ production (21090 µmol h⁻¹ g⁻¹). Even after 20 times (100 h) of cycle experiment, it still holds more than 88% OWS activity and a complete structure.     

Metal Ion-induced Gelation of High-concentration Graphite-like Crystalline Nanosheet Aqueous Suspensions

The stability and transformation of nanomaterial aqueous suspensions are essential for their applications. Preparation of high-concentration carbon nanomaterials suspensions remains challenging due to their nonpolar nature. Herein, 200 mg mL⁻¹ carbon nanomaterial aqueous suspensions are achieved by using graphite-like crystalline nanosheets (GCNs) with high hydrophilicity. Furthermore, these high-concentration GCN aqueous suspensions spontaneously transform into gels when induced by mono-, di-, and trivalent metal salt electrolytes at room temperature. Theoretical calculation of potential energy by DLVO theory reveals that the gelatinized GCNs is a new and metastable state between two usual forms of solution and coagulation. It is shown that the gelation of GCNs is due to the preferential orientation of nanosheets in an edge-edge arrangement, which differs from the case of solution and coagulation. High-temperature treatment of GCN gels produces metal/carbon materials with pore structures. This work provides a promising opportunity to create various metal/carbon functional materials.     

低渗低温低压水敏性储气层压裂改造技术研究与应用

低渗低温低压水敏性储气层因压裂液快速破胶困难、黏土膨胀水敏伤害严重和压后压裂液返排动力不足等因素，使得压裂增产面临诸多难题。针对上述难题进行了技术攻关，形成了弱交联、低温活化剂与超量破胶剂的低温储层快速破胶技术、有机盐与无机盐双元体系复合防膨技术以及高比例液氮全程助排的排液技术。该压裂增产改造技术使牛101井头屯河组首次获得工业油气流，扩展了三塘湖盆地勘探空间。     

复合轴精跟踪系统伺服带宽的优化设计

复合轴精跟踪系统决定了空间光通信APT系统最终的控制精度,需要很高的伺服带宽、伺服刚度和控制精度。针对该要求,根据精跟踪系统的性能指标和各频段的作用建立对应的期望传输特性和精跟踪系统的频率特性测试系统,对输出数据进行多项式预测滤波,采用递推最小二乘法辨识被控对象传递函数的各个参数,最终得到补偿校正函数,为精跟踪系统带宽的全频段优化设计探索出一种简便有效的设计方法。实验分析表明:精跟踪伺服带宽达到300 Hz以上,系统稳定且响应快速,测试跟踪误差约为±2μrad,各项性能指标均满足精跟踪系统的应用需求。     

纳米压印工艺中关键技术

纳米压印技术由于其分辨率高、工艺成本低以及适于大规模工业化生产的优点被广泛利用于纳米尺度的半导体器件的制作之中。然而,传统的硬模板压印技术存在着模板寿命短、大面积均匀性差以及易受颗粒影响的缺点。本文提出了一种高分子聚合物软模板（IPS）压印的方法来改进以上缺点,同时,本文提出在软模板制作和后续的紫外压印中采用变温变压阶梯升降压的方法来提高压印过程中胶的流动性,以提高压印图形的质量。最后,我们利用这种方法方法出了高质量的50纳米线宽的光栅图形。     

建立职业健康安全和环境管理体系是企业可持续发展的基础

攀钢集团成都钢铁有限责任公司建立职业健康安全和环境管理体系管理模式过程中的一些具体做法,尤其是在结合公司实际情况、探索建立GB/T28001-2001和GB/T24001-2004标准体系一体化方面的做法有独到之处,值得建立类似体系单位借鉴.     

Preparation and Characterization of Red Luminescent Ca_(0.8)Zn_(0.2)TiO_3∶ Pr~(3+), Na~+ Nanophosphor

Pr dopedalkalineearthmetaltitanateswithper ovskitestructurehaverecentlybeenthesubjectof manyinvestigations.Thisisbecauseoftheirhigh chemicalstability,strongandsharpredemission,and longafterglowluminescence[1～13].CaTiO3∶Pr3+,asa relativelynewluminescencematerialofthatcategory,andexhibitsredcathodoluminescencelocatedatthe CIEcoordinate[8]ofx=0.680andy=0.311,very closeto“idealred”ofNTSC(NationalTelevision StandardsCommittee).Inaddition,itisapromising redlongpersistencephosphor,whichmayp…     

Crystal structures and textures in the hot-forged Ni-Mn-Ga shape memory alloys

Three ferromagnetic shape-memory alloys with the chemical compositions of Ni₅₃Mn₂₅Ga₂₂, Ni₄₈Mn₃₀Ga₂₂, and Ni₄₈Mn₂₅Ga₂₂Co₅ were prepared by the induction-melting and hot-forging process. The crystal structures were investigated by the neutron powder diffraction technique, showing that Ni₅₃Mn₂₅Ga₂₂ and Ni₄₈Mn₂₅Ga₂₂Co₅ have a tetragonal, 14/mmm martensitic structure at room temperature, while Ni₄₈Mn₃₀Ga₂₂ has a cubic, L2₁ austenitic structure at room temperature. The development of textures in the hot-forged samples shows the in-plane plastic flow anisotropy from the measured pole figures by means of the neutron diffraction technique. Significant texture changes were observed for the Ni₄₈Mn₂₅Ga₂₂Co₅ alloy after room temperature deformation, which is due to the deformation-induced rearrangements of martensitic variants. An excellent shape-memory effect (SME) with a recovery ratio of 74 pct was reported in this Ni₄₈Mn₂₅Ga₂₂Co₅ polycrystalline alloy after annealing above the martensitic transformation temperature, and the “shape-memory” influence also occurs in the distributions of grain orientations.     

AISI1008圆钢混晶原因分析及有限元模拟和工艺改进

在棒材线轧制锻造爪机用AISI1008钢时,出现混晶现象,Φ50 mm棒材边缘铁素体晶粒度3级,1/2半径及心部铁素体晶粒度8级,通过对钢材进行金相组织及电镜检验,对轧制过程温度及等效应变利用Deform软件进行有限元模拟,发现造成圆钢边缘晶粒粗大的原因与终轧温度过低及轧制等效应变大且分布不均有关,将终轧温度由原820...     

核主分量分析法提取液体火箭发动机故障特征

某型号液体火箭故障仿真过程中涉及大量描述发动机状态的参数,因此在对该设备进行故障诊断前,需要对监测或仿真数据进行特征提取,以减少存储空间,缩短故障诊断时间.采用主分量分析法及其改进算法核主分量分析法对其故障仿真数据进行特征提取,从多个描述该型号一级火箭发动机故障状态的变量中选取了少量特征,采用这些特征进行故障诊断时,诊断结果正确,同时显著提高了故障诊断的实时性能.