Support stabilized PtCu single-atom alloys for propane dehydrogenation

PtCu single-atom alloys (SAAs) open an extensive prospect for heterogeneous catalysis. However, as the host of SAAs, Cu suffers from severe sintering at elevated temperature, resulting in poor stability of catalysts. This paper describes the suppression of the agglomeration of Cu nanoparticles under high temperature conditions using copper phyllosilicate (CuSiO₃) as the support of PtCu SAAs. Based on quasi in situ XPS, in situ CO-DRIFTS, in situ Raman spectroscopy and in situ XRD, we demonstrated that the interfacial Cu⁺–O–Si formed upon reduction at 680 °C serves as the adhesive between Cu nanoparticles and the silicon dioxide matrix, strengthening the metal–support interaction. Consequently, the resistance to sintering of PtCu SAAs was improved, leading to high catalytic stability during propane dehydrogenation without sacrificing conversion and selectivity. The optimized PtCu SAA catalyst achieved more than 42% propane conversion and 93% propylene selectivity at 580 °C for at least 30 hours. It paves a way for the design and development of highly active supported single-atom alloy catalysts with excellent thermal stability.

This paper describes PtCu single-atom alloys supported on copper phyllosilicate via Cu⁺–O–Si. The catalyst exhibits sintering resistance in propane dehydrogenation reaction without sacrificing activity and selectivity.     

掏槽参数对煤矿岩巷爆破效果的影响

为了提高掘进进尺,以川煤集团绿水洞矿掘进工程为背景,利用动力有限元程序LS-DYNA3D进行掏槽参数优化研究。结合井下现场实验,分析岩巷掏槽爆破不同参数动态应力、破碎范围的变化以及井下实际爆破效果。掏槽中心孔底向孔口平均有效应力峰值在有中心眼爆破较无中心眼爆破时增加了40%以上,中心眼爆破对槽腔底部的形成起主要作用。在其他条件相同的情况下单孔载荷从1.2 kg提高到1.8 kg,掏槽区中心眼底到孔口平均应力只增加20%,并且破碎范围的增加较少,实际进尺增加小于10%。现场掘进实验表明：在常规爆破载荷下,有中心眼比无中心眼爆破深度提高31%~65%,掏槽角小于78°时,随掏槽角度增加爆破进尺下降较平缓; 但掏槽角增至82°左右, 随掏槽角度增加爆破进尺下降明显。

     

导电性磁流变弹性体的研究进展

磁流变弹性体(magnetorheological elastomer,MRE)因其独特的场相关性能在工程应用领域引起了广泛关注.论文介绍了MRE的最新发展,重点介绍导电性MRE在材料设计、力学行为和实际应用等方面的研究现状.论文从高性能导电性MRE的研制开始,讨论了材料与结构设计中涉及的关键问题;介绍了导电性MRE材料在磁场作用下的磁、力、电学行为的耦合作用机理和相关物理模型;之后对导电性MRE器件的研究现状进行了总结;最后展望了导电性MRE的发展潜力和面临的挑战.     

Locally periodically poled LNOI ridge waveguide for second harmonic generation

Periodically poled lithium niobate on insulator[LNOI]ridge waveguides are desirable for high-efficiency nonlinear frequency conversions,and the fabrication proc...     

核磁共振实验最佳信号的获得

通过分析各个实验参数对核磁共振信号的影响,提出并实现了最佳信号获得的方法。实验表明,对信号影响较大的因素主要有三个,即磁场强度、样品质量和扫描电压。而这三个参数中尤以磁场强度对信号的影响最为显著。     

SYNTHESIS AND CHARACTERIZATION OF POLY{4-[2-(tert-BUTYLDIMETHYLSILOXY)ETHYL]STYRENE} AND ITS HYDROLYSIS DERIVATIVE

The living cationic polymerization of 4-[2-(tert-butyldimethylsiloxy)ethyl]styrene(TBDMES)was studied in methylcyclohexane(MeChx)/methylchloride(MeC1)(50/50 V/V)solvent mixture at-80℃.The initiator 1,1- diphenylethylene(DPE)capped 2-chloro-2,4,4-trimethylpentane(TMPCl)was formed in situ in conjunction with titanium tetrachloride(TiCl_4).The Lewis acidity of TiCl_4 was decreased by the addition of titanium(IV)isopropoxide(Ti(OiPr)_4)to accomplish living polymerization of TBDMES.Hydrolysis of poly(TBDMES)i...     

求最优权对集的一个对偶算法

1.引言 Edmonds给出了求一个图的最大权对集的算法它是从一个满足原始对偶可行的解出发使其逐步满足互补松驰条件。[1]描述了一个求最大权完美对集原始算法。它是从一个满足互补松驰条件的原始可行解出发,使其逐步满足对偶可行条件。我们给出一个求图的最大权完美对集的对偶算法,它是从一个满足互补松驰条件的对偶可行解出发使其逐步满足可行条件。本算法开始不要求给出图的一个完全对集,其对偶变量的改变法则也较[1]中的法则简单得多。其基本方法仍是用Edmonds的花的算法[2]。我们将说明本文的算法可用来解其他的最优对集问题。本文中采用的术语参看[2]。     

肺部超声B线数目与血管外肺水的相关性分析

目的探讨肺部超声监测B线数目在老年脓毒症患者液体复苏过程中评估血管外肺水的价值。方法在老年脓毒症患者液体复苏过程中应用肺部超声动态监测患者双侧胸骨旁、锁骨中线、腋前线及腋中线B线数目,同时应用脉波指示剂连续心排血量法（pulseindicatorcontinuouscardiacoutput,PiCCO）监测血管外肺水指数（extravascularlungwaterindex,EVLWI）对比,对B线数目与EVLWI进行Pearson相关性分析。结果共纳入28例患者,采集95组数据,B线数目和EVLWI呈正相关（r=0.92,P＜0.01）,同时发现B线数目与肺血管通透性指数（pulmonaryvascularpenetrationindex,PVPI）呈正相关（r=0.80,P＜0.01）。结论B线数目与EVLWI相关性良好,在老年脓毒症液体复苏过程中应用无创肺部超声可实时、动态地进行肺水监测,以早期发现肺水肿。     

电磁带隙结构在天线雷达散射截面减缩中的应用

 提出了一种使用电磁带隙结构来减小微带印刷对称阵子天线雷达散射截面的方法。该方法利用电磁带隙结构的带阻特性,使其能作为天线的地板,在带外(非谐振)时,电磁带隙结构对入射电磁波起滤波作用。仿真和实验的结果表明,电磁带隙结构能保证天线在带内辐射不受影响的同时,还大幅度地降低了天线带外的雷达散射截面。     

Rational Design of Two-Dimensional Magnetic Chromium Borides Based on First-Principles Calculation

Two-dimensional(2D) magnetic materials have been experimentally recognized recently,however,the Curie temperatures(TC) of known 2D systems are quite low.Generally,magnetic systems can be seen as constituent magnetic elements providing spins and the non-magnetic elements providing frameworks to host the magnetic elements.Short bond lengths between the magnetic and non-magnetic elements would be beneficial for strong magnetic interactions and thus high TC.Based on this,we propose to combine the magnetic element Cr and the non-magnetic element boron to design novel 2D magnetic systems.Using our self-developed software package IM2 ODE,we design a series of chromium-boride based 2D magnetic materials.Nine stable magnetic systems are identified.Among them,we find that CrB4-Ⅰ,CrB4-Ⅱ and CrBs-Ⅰ with common structural units [CrB8] are ferromagnetic metals with estimated TC of 270 K,120 K and 110 K,respectively.On the other hand,five CrB3 phases with structural units [Cr2B12] are antiferromagnetic metals.Additionally,we also find one antiferromagnetic semiconductor CrB2-Ⅰ.Our work may open new directions for identifying 2D magnetic systems with high TC.