摘要：To improve the photocatalytic oxidation reaction activity for NO removal, photocatalysts with excellent activity are required to activate molecular oxygen. Solid solution and heterojunction were suggested as effective strategies to enhance the molecular oxygen activation viaexciton and carrier photocatalysis. In this study, a solid solution and heterojunction containing BiOBr0.5I0.5/BiOI catalyst was synthesized, and it showed improved photocatalytic activity for removing NO. The photocatalytic NO removal mechanism indicated that synergistic effects between the solid solution and heterojunction induced the enhanced activity for molecular oxygen activation. The photogenerated holes, superoxide, and singlet oxygen generated by the carrier and exciton photocatalysis supported the high photocatalytic NO removal efficiency. This study provides new ideas for designing efficient Bi-O-X(X = Cl, Br, I) photocatalysts for oxidation reactions.

摘要：This paper proposes a novel strategy based on fragment meshes of Shiue et al. for GPU rendering of compos- ite subdivision surfaces. Two enumeration systems are established to label the primitives of each fragment mesh. A sector-layer-index enumeration system is responsible for retrieving proximities for subdivision masks while a sec- tor-index enumeration system designates a 2D texture buffer in GPU. Recurring to the free conversion between them, our approach may get rid of lookup tables that are designed to record subdivision masks. In addition, relatively small composite subdivision masks make it easy to develop automatically retrieving techniques. Finally, as center vertices are often irregular, their computation is related to an average with alterable number of items. Considering that variable loop is not efficient in GPU, we evaluate the center vertex of each fragment mesh using the linear combination of its level 0, level 1 and limit positions instead of averaging schemes. Experiments demonstrate that our approach generally outper- forms that of Shiue et al. in FPS by a long way.

摘要：The direct one-step separation of polymer-grade C_(2)H_(4) from complex light hydrocarbon mixtures has high industrial significance but is very ***,an ethylene-adsorption-weakening strategy is applied for precise regulation of the pore geometry of four tailor-made metal–organic frameworks(MOFs)with pillar-layered structures,dubbed TYUT-10/11/12/*** on its pore geometry design and functional group regulation,TYUT-12 exhibits exceptional selective adsorption selectivity toward C_(3)H_(8),C_(3)H_(6),C_(2)H_(6),C_(2)H_(2),and CO_(2) over C_(2)H_(4);its C_(2)H_(6)/C_(2)H_(4) adsorption selectivity reaches 4.56,surpassing the record value of 4.4 by Fe_(2)(O_(2))(dobdc)(dobdc^(4-)=2,5-dioxido-1,4-benzenedicarboxylate).The weak p–p stacking binding affinity toward C_(2)H_(4) in TYUT-12 is clearly demonstrated through a combination of neutron powder diffraction measurements and theoretical *** experiments demonstrate that C_(2)H_(4) can be directly obtained from binary,ternary,quaternary,and six-component light hydrocarbon mixtures with over 99.95%purity.

摘要：Topological phase is an important development and unexplored degree of freedom of traditional band theory[1].Generally,it manifests in physics through the boundary states revealed by the bulkedge *** bulk topology implies various low-dimensional states at the boundary,giving extraordinary approaches to manipulate *** structure that encodes the band topology is the system associated with space–time evolution,such as Floquet topological insulator[2,3].Its quasistatic limit involves time-dependent dynamic adiabatic evolution[4,5].However,dynamic evolution is challenging as it requires fast modulation to overcome the dissipation of state before it is pumped from one edge to another[6].An alternative approach is to use an additional degree of freedom to replace the role of time,and an illuminating system is the weakly coupled waveguides,whose governing equation can be directly mapped to Schrodinger equation with time modulation replaced by wave propagation along the ***,such strategy has been largely explored to realize the pumping of topological boundary states in optics[7,8]and elastic wave[9,10].However,the strategy for acoustics is subtly different as the coupling of the acoustic waveguides is not weak for the fundamental waveguide *** exploring the possibility to realize two-dimensional(2D)topological acoustic pumping in a continuous regime remains an open question.

摘要：The ever-decreasing size of transistors requires effectively electrostatic control over ultra-thin semiconductor *** design of the gate configuration can fully persevere the intrinsic property of two-dimensional(2 D)*** we design and demonstrate a 2 D Mo S_(2) transistor with omega-shaped gate,in which the local gate coupling is enhanced by the non-planar *** omega-shaped non-planar transistors exhibit a high current of 0.89 A/lm and transconductance of32.7 l S/*** high performance and desirable current saturation promise the construction of robust logic *** inverters show a voltage gain of 26.6 and an ideal total margin nearly 89%.We also assemble NOT-AND(NAND)gate on an individual Mo S_(2) flake,and the constructed NAND gate demonstrates the universal functionality of the transistors as *** work provides an alternative strategy to fully take the advantages of 2 D materials for high-performance field-effect transistors.

摘要：It is well-known that global warming due to anthropogenic atmospheric greenhouse effects advanced the start of the vegetation growing season （SOS） across the globe during the 20th century. Projections of further changes in the SOS for the 21st century under certain emissions scenarios （Representative Concentration Pathways, RCPs） are useful for improving understanding of the consequences of global warming. In this study, we first evaluate a linear relationship between the SOS （defined using the normalized difference vegetation index） and the April temperature for most land areas of the Northern Hemisphere for 1982-2008. Based on this relationship and the ensemble projection of April temperature under RCPs from the latest state-of-the-art global coupled climate models, we show the possible changes in the SOS for most of the land areas of the Northern Hemisphere during the 21st century. By around 2040-59, the SOS will have advanced by -4.7 days under RCP2.6, -8.4 days under RCP4.5, and -10.1 days under RCPS.5, relative to 1985-2004. By 2080-99, it will have advanced by -4.3 days under RCP2.6, -11.3 days under RCP4.5, and -21.6 days under RCP8.5. The geographic pattern of SOS advance is considerably dependent on that of the temperature sensitivity of the SOS. The larger the temperature sensitivity, the larger the date-shift-rate of the SOS.

摘要：目的 评估不同运动习惯的中国老年人进行居家脊柱后凸专项运动的可行性,探讨该运动计划对减少胸椎后凸角度和改善活动能力的效果.方法 本研究采用单组前后对照研究设计.在中国武汉市4个社区选取20名年龄≥60岁,患有胸椎过度后凸畸形且有康复潜力的老年人为研究对象.老年人接受为期6周的居家脊柱后凸专项运动干预,包括热身、肌肉加强、脊柱直立、脊柱灵活性和放松5个部分(22个动作),共有7次1 h的小组课程和35次的居家练习.在干预前后对老年人两种站立姿势下胸椎后凸角度、静态平衡、动态平衡、心肺功能、功能步态、疼痛及自我形象等指标进行评估并比较.采用老年人小组课程的出勤率、居家练习依从性及参与评价等指标来分析干预的可行性.结果 所有老年人均完成了小组课程和>75%的居家练习内容.干预后老年人在放松和最佳站立姿势下胸椎后凸角度较干预前均减少,中位数及四分位数间距分别 为-12.0°(-15.5°,-4.0°)(Z=-3.98,P<0.001)和-10.0°(-14.0°,-5.3°)(Z=-3.79,P<0.001).此外,干预后老年人疼痛程度明显减轻(P<0.001),自我形象认知得分提高(P<0.001),5项活动能力水平也有所提高(P<0.01).干预前后凸严重程度和日常体力活动强度不影响干预效果.大多数老年人认为干预强度适中且令人满意.结论 居家脊柱后凸专项运动在老年人胸椎过度后凸干预中具有可行性,并且可减少胸椎后凸角度,提升活动能力.

摘要：This paper proposes new ways to understand the sense of universality in music through a reflection and analysis of George Crumb＇s Black Angels （Images 1）： Thirteen lmages from the Dark Land, one of the defining musical expressions of the Vietnam War era. It centers on an analysis of the relationship of the body/self to an ＂ecology of war＂ produced through Crumb＇s music that renders these selves indistinct within this musical geography. The selves that inhabit Black Angels could be that of anybody in particular since Crumb seeks to invoke in his music the primeval experience of terror that inhabits in all of us as the inheritors of mankind＇s violence. This sense of the universal militates against the desirable qualities of popular music that rely on the production of autonomous and singular selves that make the distinction between enemy and friend possible and distinct. We focus on Crumb＇s use of archaisms, his construction of time in this piece, and the author＇s overall purpose to invoke a time of war rather than to reflect the conditions of war, in order to delineate the contours of the universal time and space producing the undifferentiated primeval self of war. We conclude that although Crumb＇s rejection of the national self deprives the piece of a salient place in the popular cannon of the war, it has left an intellectual legacy on the times of the Vietnam War that deserves to be preserved.

摘要：A family of switched-capacitor based resonant converters is *** converters are in *** adding different number of switched-capacitor cells,different output voltage conversion ratio can *** switching devices in the converters operate under zero-current *** high frequencyoperations and high efficiency are possible.

摘要：Low cost,high strength and high elongation steel is always the major trends of steel development especially for automotive ***,raising strength usually brings about loss of ductility,which is known as the strength-ductility trade-off[1].Solving strength-ductility trade-off by increasing low cost carbon content is the century-long pursuit of ***[2]pointed out that investigation since 1900s indicates that the increase of carbon content leads to enhancing strength,but deteriorating ductility and other properties of steels.