摘要：Owing to excellent conductivity and abundant surface terminals,MXene-based heterostructures have been intensively investigated as energy storage ***,elaborate design of the structure and composition of MXene-based hybrids towards superior electrochemical performance is still ***,we present an ingenious leaf-inspired design for preparing a unique Sb_(2)S_(3)/nitrogen-doped Ti_(3)C_(2)T_(x)MXene(L-Sb_(2)S_(3)/Ti_(3)C_(2))***-situ TEM observations reveal that the leaflike Sb_(2)S_(3)nanoparticles with numerous mesopores can well relieve the large volume changes via an inward pore filling mechanism with only 20%outward expansion,whereas highly conductive N-doped Ti_(3)C_(2)T_(x)nanosheets can serve as the robust mechanical support to reinforce the structural integrity of the *** from the structural and constituent merits,the L-Sb_(2)S_(3)/Ti_(3)C_(2)anode fabricated exhibits a fast sodium storage behavior in terms of outstanding rate capability(339.5 mA h g^(-1)at 2,000 mA g^(-1))and high reversible capacity at high current density(358.2 mA h g^(-1)at 1,000 mA g^(-1)after 100 cycles).Electrochemical kinetic tests and theoretical simulation further manifest that the boosted electrochemical performance mainly arises from such a unique leaf-like Sb_(2)S_(3)mesoporous nanostructure with abundant active sites,and enhanced Na^(+)adsorption energy on the heterojunction formed between Sb_(2)S_(3)nanoparticles and Ti_(3)C_2)matrix.

摘要：Two-dimensional(2D)metal oxides and chalcogenides(MOs&MCs)have been regarded as a new class of promising electro-and photocatalysts for many important chemical reactions such as hydrogen evolution reaction,CO_(2) reduction reaction and N2 reduction reaction in virtue of their outstanding physicochemical ***,pristine 2D MOs&MCs generally show the relatively poor catalytic performances due to the low electrical conductivity,few active sites and fast charge ***,considerable efforts have been devoted to engineering 2D MOs&MCs by rational structural design and chemical modification to further improve the catalytic ***,we comprehensively review the recent advances for engineering technologies of 2D MOs&MCs,which are mainly focused on the intercalation,doping,defects creation,facet design and compositing with functional ***,the relationship between morphological,physicochemical,electronic,and optical properties of 2D MOs&MCs and their electro-and photocatalytic performances is also systematically ***,we further give the prospect and challenge of the field and possible future research directions,aiming to inspire more research for achieving high-performance 2D MOs&MCs catalysts in energy storage and conversion fields.

摘要：能谱计算机断层扫描在数据采集过程中可以区分光子能量,并同时得到多个能量通道的投影。由于单个能量通道只包含了总光子数的一小部分,且大多数光子计数探测器只能承受有限的计数率,所以多通道投影通常含有较大的噪声。为了从噪声投影中重建出高质量的能谱图像,利用不同能量通道下重建图像具有结构相似性,提出一种基于结构先验的加权非局部全变分(NLTV)重建算法。设计了简单和复杂两种模型进行仿真,比较了TV算法、NLTV算法、加权NLTV算法,以及基于结构先验的加权NLTV等去噪算法的重建效果,结果表明,本文算法对复杂模型和高噪声模型的重建具有明显优势。

摘要：在对阳高云林寺彩塑现场调查的基础上,利用X射线荧光分析、X射线衍射分析、扫描电子显微镜(SEM)及能谱分析(EDS)、显微共聚焦激光拉曼光谱分析等方法对颜料的化学成分进行了分析。研究发现云林寺彩塑是遵循传统工艺制作的,同时也有裱纸、颜料混合使用、拨金等个性之处。颜料方面,红色使用了铅丹、朱砂和铁红三种,绿色颜料为巴黎绿和碱式氯化铜两种,蓝色见有蓝铜矿和群青两种,黑色为炭黑。本研究比较全面地揭示了云林寺大雄宝殿彩塑制作工艺和使用材料的情况,丰富了对古代彩塑制作工艺和材料的认识,为保护修复实施奠定了基础。

摘要：根据750kV变压器出线装置绝缘结构的特点,对国产化核心技术进行了深入研究,应用Electro v6.2和ElecNet7.0软件建立了关键部位的面向工程的仿真模型,进行了二维和三维电场的有限元分析,并且对安全裕度进行计算分析,解决了绝缘结构优化设计、电场计算模型定义、出线装置的二维和三维电场计算等关键技术难题。完成了750kV出线装置的全域电场计算和安全裕度分析比较,通过对电极形状和绝缘结构的优化设计和电场计算,避免了由于电场集中现象引起的绝缘缺陷。研制完成的国产750kV出线装置已应用于多项实际工程,多台产品试验和实际运行业绩验证了国产化750kV出线装置的可靠性。

摘要：从绿色管理的概念出发,在研究园林绿化产业巨大的环境保护与生态效益的基础之上,探讨了将绿色管理思想运用到园林绿化产业中,并从园林绿化设计、施工、养护、废弃物处理4个环节具体分析了绿色管理在园林绿化产业的运用。

摘要：化工工业是现代工业体系的重要组成部分,它主要是对化工原材料进行加工,使之成为其他工业中的工业材料,内容涵盖了建筑、电力、矿业等多个领域。在进行化工生产时,对于化工工艺的设计是最重要的部分,本文将对化工工艺设计进行简单的介绍,并对化工工艺设计中的安全问题以及控制措施进行重点的关注。

摘要：以山西省晋中市科技创新城某实际工程为例,结合场地地质情况,在拉森钢板桩没有内支撑的情况下,对基坑支护结构进行设计及计算,有助于缩短工期,有效地降低建设成本,为今后同类工程提供参考。

摘要：在炉渣掺量分别为0、10%、30%和50%的混凝土中,分别掺入阴离子型聚羧酸减水剂(PC)和两性型聚羧酸减水剂(APC),设计坍落度为(210±10)mm,测试混凝土塑性阶段和硬化阶段的性能,探讨两性型聚羧酸减水剂APC与炉渣水泥的相容性。结果表明:APC能更好地提高炉渣水泥体系的吸附分散性能;但是掺入APC同时增大了混凝土引气性,降低硬化混凝土早期强度,不利于大掺量炉渣的使用。

摘要：煤矿提升机钢丝绳性能对煤矿安全生产有着直接影响。对DF900型提升机的钢丝绳进行了模拟,探讨了重吊煤炭过程中应力和变形的分布。利用SolidWorks和ABAQUS软件建立了DF900型提升机中交叉股钢丝绳6×6+WS结构的有限元模型,在钢丝绳正常工作范围内,加载5 000 N的轴向拉力,分析应力和变形分布。通过有限元分析计算结果表明,钢丝绳受力呈空间螺旋分布,绳股外侧钢丝受力是钢丝绳中最大的,可为煤矿提升机钢丝绳的设计和改进提供参考。