摘要：Al Si10Mg porous protective structure often produces different damage forms under compressive loading,and these damage modes affect its protective *** order to well meet the service requirements,there is an urgent need to comprehensively understand the mechanical behavior and response mechanism of AlSi10Mg porous structures under compressive *** this paper,Al Si10Mg porous structures with three kinds of volume fractions are designed and optimized to meet the requirements of high-impact,strong-energy absorption,and lightweight *** mechanical behaviors of AlSi10Mg porous structures,including the stress-strain relationship,structural bearing state,deformation and damage modes,and energy absorption characteristics,were obtained through experimental studies at different loading *** damage pattern of the damage section indicates that AlSi10Mg porous structures have both ductile and brittle mechanical *** simulation studies show that the AlSi10Mg porous structure undergoes shear damage due to relative misalignment along the diagonal cross-section,and the damage location is almost at 45°to the load direction,which is the most direct cause of its structural damage,revealing the damage mechanism of AlSi10Mg porous structures under the compressive *** normalized energy absorption model constructed in the paper well interprets the energy absorption state of Al Si10Mg porous structures and gives the sensitive location of the structures,and the results of this paper provide important references for peers in structural design and optimization.

摘要：Synthesizing a stable and efficient photocatalyst has been the most important research goal up to now. Owing to the dominant performance of g-C3N4 (graphitized carbonitride), an ordered assemble of a composite photocatalyst, Zn-Ni-P@g-C3N4, was successfully designed and controllably prepared for highly efficient photocatalytic H2 evolution. The electron transport routes were successfully adjusted and the H2 evolution was greatly improved. The maximum amount of H2 evolved reached about 531.2 μmol for 5 h over Zn-Ni-P@g-C3N4 photocatalyst with a molar ratio of Zn to Ni of 1:3 under illumination of 5 W LED white light (wavelength 420 nm). The H2 evolution rate was 54.7 times higher than that over pure g-C3N4. Moreover, no obvious reduction in the photocatalytic activity was observed even after 4 cycles of H2 production for 5 h. This synergistically increased effect was confirmed through the results of characterizations such as XRD, TEM, SEM, XPS, N2 adsorption, UV-vis DRS, transient photocurrent, FT-IR, transient fluorescence, and Mott-Schottky studies. These studies showed that the Zn-Ni-P nanoparticles modified on g-C3N4 provide more active sites and improve the efficiency of photogenerated charge separation. In addition, the possible mechanism of photocatalytic H2 production is proposed.

摘要：Geomantic pagodas are evolved from Buddhist pagodas in the history of china. During the Ming and Qing Dynasties, people attached importance to the imperial examination, so they were keen on construction of geomantic pagodas in landscapes to pray for good luck. This phenomenon was more obvious in southern china, especially in Guangdong and Jiangxi. In this paper, the location and spatiotemporal distribution of geomantic pagodas in Guangdong and Jiangxi were studied by using Google Earth and Arc GIS, combining with ASTER GDEM data. In addition, the effects of elevation, topographic profile and slope on site selection of geomantic pagodas were investigated to sum up the distribution and space environment characteristics of geomantic pagodas in Guangdong and Jiangxi, explore the relationship between geomantic pagodas structure and city landscape, and investigate the effects of spatio-temporal distribution of geomantic pagodas on city pattern.

摘要：设计高选择性、稳定和低成本的催化剂将二氧化碳电化学转化为高附加值的碳产品以缓解二氧化碳排放和能源危机仍是一个挑战。通过将单原子CoN_(4)活性位点嵌入石墨烯基体中得到了一种强健和高效的CO_(2)还原电催化剂。结果表明,这些高度分散的CoN_(4)位点具有出色的CO_(2)还原活性,在电压为−0.76 V(***),过电位为0.65 V时,CO法拉第效率达~95%。同时,该催化剂具有优异的稳定性。本工作为设计高效CO_(2)还原电催化剂奠定了基础。

摘要：The recent rapid growth in electronics has reached the point where there is a need for solid-state devices with excellent physical flexibility, which will be a significant advantage in modern electronic devices. In particular, metal nanowires and nano-particles are chosen for electrodes because of their low resistance and high mechanical stability. Among the various alternatives, Ag nanomaterials have recently garnered increasing attention due to the high intrinsic conductivity, a transparency with a low sheet resistance and relatively low cost. We herein summarize recent developments toward flexible electronics on the basis of Ag nanomaterials , which show promising performance and outperform the commonly used. The typical fabrication techniques along with the promising applications for flexible devices, are thoroughly discussed.

摘要：为了同时保证融合质量和效率,提出了一种基于多尺度高斯滤波和形态学变换的图像融合方法。设计了多尺度高斯滤波,将源图像分解为一系列细节图像和近似图像,并使用多尺度顶帽和底帽分解来完全提取近似图像中不同尺度的明暗细节。构造了多尺度形态学内外边缘分解,以充分提取细节图像的边缘信息。实验结果表明,该方法与典型的基于多尺度分解的融合方法相当甚至更好,同时比一些先进的基于多尺度分解的方法(如NSCT和NSST)运算速度快得多。

摘要：The photocatalytic decomposition of water to produce hydrogen is an important process,through which solar energy can be converted to chemical ***-precious metal phosphides have quietly attracted attention as an emerging inexpensive *** this study,we reported that a CoP/CeVO4 hybrid photocatalyst exhibited high hydrogen evolution efficiency owing to EY(eosin Y)sensitization under visible light irradiation for the first time,and the amount of generated hydrogen reached 444.6μmol in 5 *** CoP/CeVO4 nanohybrids were synthesized by a simple chemical precipitation *** coupling of CoP and CeVO4 with ZIF-9 as a precursor could be completed in one *** CeVO4 particles were firmly attached to the surface of the CoP particles to form a"small point"to"big point"*** results of X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,EDX,and transmission electron microscopy showed the formation of CoP and CeVO4 nanoparticles and the structure of the *** on a detailed analysis of the Mott-Schottky plot,the UV-vis diffuse reflectance spectra,photocurrent-time(it)curve,Tafel curve,Nyquist curve(EIS),linear volt-ampere curve(LSV),and steady-state fluorescence spectra were *** time-resolved photoluminescence measurements indicated that the reason for the high-efficiency hydrogen evolution of CoP/CeVO4 was that the bands of CoP and CeVO4 were bent due to the existence of the Schottky barrier,and a heterojunction was formed between CoP and CeVO4,which generated an internal electric field and accelerated the charge *** addition,the synergistic effect between CoP and CeVO4 provided a new hydrogen-evolution activity center for each of *** improved carrier separation efficiency and the decrease in the photo-generated recombination rate led to the excellent photocatalytic hydrogen-evolution activity of the CoP/CeVO4 composite *** work provides a new strategy for modulating the el

摘要：An efficient CuO‐modified zeolitic imidazolate framework‐9(ZIF‐9)photocatalyst is successfully prepared at room temperature under mild *** is observed that the ZIF‐9/CuO photocatalyst is effective for H2generation under visible light with sacrificial agent *** the CuO is introduced,the photocatalytic properties of ZIF‐9are greatly improved and when the content of CuO is40%,the photocatalytic activity reaches a maximum of78.74μmol *** results from the200–300nm cube structure of ZIF‐9being able to adsorb more dye molecules and the CuO,which connects with ZIF‐9,greatly improving the electronic transmission ***,the interaction between the dye molecule Eosin Y(EY)and the catalyst is also studied by transient fluorescence spectroscopy.A series of characterizations,such as SEM,TEM,XPS,XRD,UV‐vis,FTIR,transient fluorescence and photocurrent,are conducted,and the results are in good agreement with the experimental *** addition,the possible reaction mechanism over EY‐sensitized ZIF‐9/CuO under visible light irradiation is proposed.

摘要：As the revitalization of city culture and the city cultural confidence has been increasingly valued, the ancients' perception and interpretation of mountains, rivers and cultural landscapes, as well as their wisdom in the construction of traditional cities deserve more attention and further exploration. Taking ancient Yiyang City for example, this paper on the basis of local chronicles and literature analyzed the construction history of the city, famous mountains and rivers, and top eight views, and attempted to interpret the construction system of "mountain, river and city" landscape of traditional Chinese cities, in order to provide historical basis and cultural background for revitalizing local cultures and shaping urban landscape patterns, and offer spatial strategies for the city protection and renewal.

摘要：Au/H相似性的研究是现代化学中的一个热门话题.我们从理论上报道Au/H相似的新成员:共价化合物B2Au4,离子化合物Al2Au4和BAl Au4.采用密度泛函和波函数理论方法对比研究了缺电子体系B2Au4、Al2Au4和BAl Au4的几何和电子结构.详细讨论了它们基态结构的轨道、适应性自然密度划分(Ad NDP)和电子局域函数(ELF)分析.计算结果表明稍微扭曲变形的C2B2Au4是基态结构,在这个共价化合物中含有两个B―Au―B三中心二电子(3c-2e)键.然而C3vAl+(Al Au4)-和C3vAl+(BAu4)-被研究证明是含有三个X―Au―Al三中心二电子键的类盐化合物(在Al2Au4中X=Al,BAl Au4中X=B).Al2Au4和BAl Au4是至今为止首例报道的在离子缺电子体系中含有金桥键的化合物.同时计算了B2Au4-、Al2Au4-和BAl Au4-阴离子基态结构的绝热剥离能和垂直剥离能,为实验表征提供依据.文中报道的金桥键为共价键和离子键相结合的缺电子体系提供了一个有趣的键合模式,有助于设计含有高度分散金原子的新材料和催化剂.