Rheological phase reaction synthesis and electrochemical performance of LiFe2/3Mn1/3PO4/C cathode for lithium-ion batteries

LiFe_2/3Mn_1/3PO₄/C composite was prepared by the rheological phase reaction using LiH₂PO₄, Li₂CO₃, FePO₄, Mn(Ac)₂·4H₂O and ascorbic acid as starting materials. The crystal structure and morphology of as-synthesized sample were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analysis of XRD results showed that the obtained sample was single-phase with orthorhombic olivine-type structure (Pnma space group). SEM micrographs revealed that the sample was aggregates, with an irregular morphology. The initial discharge capacity was 166.9, 149.1, 139.6, 112.8, 82.93 mAh g^??1 at the rate of 0.1, 0.5, 1, 2, and 10 C, respectively. And when the rate was 0.1, 0.5, 1, 2, and 10 C, the capacity retention was 92.2%, 90%, 92.9%, 97.6%, 91.5% after 50, 100, 200, 200, 500 cycles, respectively.

     

宝钢2300 mm宽厚板连铸机扇形段的质量控制

扇形段是连铸机组中的主要设备,扇形段制造水平的高低将直接影响到板坯厚度的均匀性,对最终的钢板轧制质量起着十分重要的作用。阐述扇形段主要部件的质量控制。     

课程置换在高职软件技术专业培养中存在的问题与对策

本文对高职软件技术专业培养中的课程置换进行研究,发现课程置换已经成为许多高校提升自己办学水平,拓宽学生就业渠道的有效途径,同时,针对课程置换中存在的师资、课程设置等问题,并提出了将非学历教育引入到学历教育中的对策。     

支持HLA仿真和并行绘制的统一对象模型研究

随着计算机硬件、软件、网络以及社会需求的发展,分布式交互仿真应用对大规模复杂场景和大量仿真实体对象的管理能力和绘制能力提出了较高的要求.针对现有HLA仿真应用中大规模复杂场景的视景仿真实时性较差、仿真实体对象管理与绘制对象管理是分离的等问题,提出了统一对象模型,包含异质实体对象树、操作记录列表和统一访问接口,实现了仿真实体对象和绘制对象的高效组织和统一管理.该统一对象模型在HLA仿真平台和并行绘制平台之间建立了高效的数据交换桥梁,减轻了两者集成的开发工作量,并有效地支持了大规模复杂场景和大量仿真实体对象的实时绘制,有助于提高仿真的实时性.该统一对象模型对于HLA仿真平台和并行绘制平台具有通用性.最后给出了实验结果和分析.     

下一代车载时间敏感网络架构设计与调度评估

智能网联汽车(Intelligent Connected Vehicle, ICV)是未来汽车行业发展的主要方向之一,其对车载网络通信的带宽、延迟出了较高的要求。针对该要求,提出了基于以太网的电子电气架构(Electronic/Electrical Architecture, EEA);在分析基于IEEE802.1Qbv的时间敏感网络(Time-sensitive Networking, TSN)传输调度机制的基础上,实现了控制数据流和传感器数据流的增量式调度。通过评估和对比,TSN拥有更高的带宽、更低的传输时延,有望成为下一代车载网络。     

无模板剂水热合成Bi12O17Cl2纳米带及其阻燃性能研究

以β-Bi2O3为原料,采用无模板剂水热法制备了Bi_(12)O_(17)Cl_2纳米带,利用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和高分辨透射电镜(HRTEM)对其形貌和结构进行了表征并作为阻燃剂添加到聚氯乙烯(PVC)中评价其阻燃性能。结果表明,适宜的Bi/Cl物质的量比对水热合成Bi_(12)O_(17)Cl_2纳米带及其化学计量比影响显著,当Bi/Cl物质的量比为1∶2.5时,可得到分散性好、形貌均匀的Bi_(12)O_(17)Cl_2纳米带;改变Bi/Cl物质的量比,纳米带中Bi/Cl化学计量比从6∶1变成2.4∶1。初步探讨了Bi_(12)O_(17)Cl_2纳米带可能的生长机理,在水热反应过程中,Bi 3+与Cl-发生络合反应形成BiCln3-n络合物,从而合成Bi_(12)O_(17)Cl_2纳米带。     

Effect of sintering condition on microstructure and dielectric properties of BSTN composite ceramics

The effect of sintering condition on the phase composition, microstructure and dielectric properties of barium strontium titanate niobate (BSTN) composite ceramics, in which the perovskite phase and the tungsten bronze phase coexisted, was investigated by XRD, SEM and LCZ Meter. The results show that more Sr²⁺ ions dissolved from the grain boundaries into the crystal lattice of the pervoskite phase and the tungsten bronze phase, especially, into the lattice of the pervoskite phase with the increasing of sintering temperature and sintering time, respectively. So the Curie temperature point decreases with the increasing of sintering temperature. The crystal growth rate of the tungsten bronze phase is higher than that of the perovskite phase in BSTN composite ceramics as the sintering temperature increases. The reasonable sintering temperature is about 1275 °C for BSTN composite ceramics. The activation energy to setting up polarization in BSTN composite ceramics increases with the increase of the applied frequency.     

项目管理技术在行业制造过程管理中的应用研究

适应行业制造管理的需求,提出了将项目管理技术应用到面向行业的产品制造过程管理中的模式。重点讨论了项目管理技术与行业制造过程管理结合的必然性、可行性和利用项目管理技术对产品制造过程进行管理的内容与手段。     

低品位铁矾土综合利用的试验研究

作者开展了利用低品位铁矾土生产节能、早强水泥的研究,确定了其合理组成,取得了既能在1250℃的较低温度下烧成水泥熟料,又能较多地利用铁矾土的效果。同时研究还表明,该种水泥不仅早期强度较高,而且抗硫酸盐性能较好,具有良好的实用价值。针对C_4AF是否具有胶凝性这一有争议的问题,本文研究表明,烧结法所制得的C_4AF确实具有较好的胶凝性能;Cr~(a+)、Ni~(a+)、Ti~(4+)既可促进C_4AF的形成,又能提高其早期强度;二水石膏虽然能提高C_4AF的早期强度,但降低了其水化速率,特别是早期水化速率。C_4AF的性能受实验方法、实验条件影响较大,作者认为这可能是历来各家结果不一致的主要原因。     

THE GENESIS OF THE SOUTH CHINA SEA AND ITS HYDROCARBON-BEARING BASINS

The formation of the South China Sea was primarily controlled by the NeoCathaysian and Nanhai tectonic systems (Early Cretaceous-Early Tertiary, and Late Oligocene-Early Miocene, respectively). These two tectonic systems are associated with the first and second phases of spreading in the South China Sea, where 33 sedimentary basins have so far been located. Basin generation and development was tectonically controlled, and four basin types have been identified: tensile, tensile-shear, compressive, and compressive-shear. Tensile and tensile-shear basins in the Nanhai system, and the compressive basins in the NeoCathaysian system, have the most promising oil and gas potential.