模内贴箔装饰的自动化生产

详细介绍了一种新型装饰工艺－模内贴箔工艺的自动化过程及生产要求。     

Catalytic activities and properties of mesoporous sulfated Al2O3–ZrO2

Mesoporous sulfated Al₂O₃–ZrO₂ (MSAZ) catalysts with large surface areas and pore volumes after calcination at high temperature (650 °C) and with higher Al₂O₃ content than 20wt% were successfully prepared from a template of block copolymer (P84). The MSAZ catalysts were characterized by X-ray diffraction (XRD), N₂ adsorption, transmission electron microscopy (TEM), ²⁷Al magic-angle spinning nuclear magnetic resonance (MAS NMR), thermogravimetric analysis (TG–DTG), temperature-programmed desorption of ammonia (NH₃-TPD) and infrared spectra (IR) of adsorbed pyridine. It is shown that the resulting mesostructured sulfated Al₂O₃–ZrO₂ samples have a well-developed textural mesoporosity. The number of acid sites present on MSAZ catalysts is higher than that on conventional sulfated zirconia, and the former catalysts are more active than the latter one for various acid-catalyzed reactions.     

环氧树脂/蒙脱土纳米复合材料性能的研究

用一种新型的热稳定性较好的改性剂2，2’-二[4-(4-氨基苯氧基)苯基]-丙烷(BAPP)改性钠基蒙脱土，再与环氧树脂进行纳米复合制备了环氧树脂／蒙脱土纳米复合材料。讨论了蒙脱土用量对环氧树脂／蒙脱土纳米复合材料性能的影响，并对其结构和性能进行了表征和测试。结果表明：改性使蒙脱土层间距变大，制备出的环氧树脂／蒙脱土纳米复合材料剥离结构较好，环氧树脂／蒙脱土纳米复合材料的玻璃化转变温度和动态储能模量随改性蒙脱土用量的增加呈现较好的递增趋势。     

Agent long-term coalition credit

Agent trust researches become more and more important because they will ensure good interactions among the software agents in large-scale open systems. Moreover, individual agents often interact with long-term coalitions such as some E-commerce web sites. So the agents should choose a coalition based on utility and trust. Unfortunately, few studies have been done on agent coalition credit and there is a need to do it in detail. To this end, a long-term coalition credit model (LCCM) is presented. Furthermore, the relationship between coalition credit and coalition payoff is also attended. LCCM consists of internal trust based on agent direct interactions and external reputation based on agent direct observation. Generalization of LCCM can be demonstrated through experiments applied in both cooperative and competitive domain environment. Experimental results show that LCCM is capable of coalition credit computation efficiently and can properly reflect various factors effect on coalition credit. Another important advantage that is a useful and basic property of credit is that LCCM can effectively filter inaccurate or lying information among interactions.     

Batch Nearest Neighbor Search for Video Retrieval

To retrieve similar videos to a query clip from a large database, each video is often represented by a sequence of high- dimensional feature vectors. Typically, given a query video containing m feature vectors, an independent nearest neighbor (NN) search for each feature vector is often first performed. After completing all the NN searches, an overall similarity is then computed, i.e., a single content-based video retrieval usually involves m individual NN searches. Since normally nearby feature vectors in a video are similar, a large number of expensive random disk accesses are expected to repeatedly occur, which crucially affects the overall query performance. Batch nearest neighbor (BNN) search is stated as a batch operation that performs a number of individual NN searches. This paper presents a novel approach towards efficient high-dimensional BNN search called dynamic query ordering (DQO) for advanced optimizations of both I/O and CPU costs. Observing the overlapped candidates (or search space) of a pervious query may help to further reduce the candidate sets of subsequent queries, DQO aims at progressively finding a query order such that the common candidates among queries are fully utilized to maximally reduce the total number of candidates. Modelling the candidate set relationship of queries by a candidate overlapping graph (COG), DQO iteratively selects the next query to be executed based on its estimated pruning power to the rest of queries with the dynamically updated COG. Extensive experiments are conducted on real video datasets and show the significance of our BNN query processing strategy.     

电子产品先进设计技术与先进制造技术初探

文章针对当代IT产业中先进技术、先进材料、先进器件飞速发展给予电子产品设计技术和生产技术的挑战，基于高度保障产品质量的要求，基于充分发挥现代高技术的优势的出发点，就原理性样机开发、生产性样机转换和产品生产三大阶段中融合先进的技术、采用合理的步骤以及运用先进的管理理念等现代化手段作了一些试探性的阐述。     

湖南省土壤中天然放射性核素含量调查研究

本文报道湖南省土壤中天然放射性核素含量的调查结果。布点方法与环境陆地γ辐射剂量率调查相同,全省共布25×25km 网格点309个,土类加密点5个,特殊加密点7个,共采集土壤样品321个。土壤样品中天然放射性核素含量的测定采用放化分析方法。调查结果表明,湖南省土壤中~(23(?))U、~(232)Th、~(226)Ra 和~(40)K 含量按样品数的加权均值分别为48.05、54.82、59.36和447.75Bq/kg。零陵地区土壤中~(238)U、~(232)Th 和~(226)Ra 含量最高,郴州地区次之,湘西自治州地区居三。湖南省6类主要土壤中~(40)含量较为接近,而红壤中~(238)U、~(232)Th 和~(226)Ra 含量较高。     

First principles modeling of disorder scattering in graphene

It is important to investigate impurity scattering phenomena when modeling graphene nanoscale devices, as impurities are invariably present in any realistic system and can significantly influence graphene carrier transport. We present a short review of quantum transport where density functional theory (DFT) is carried out within the nonequilibrium Green’s function formalism (NEGF), focusing on a recent extension of this framework in the form of nonequilibrium vertex correction (NVC) that captures random graphene impurity scattering in a systematic fashion. Our results show that disorder effects significantly alters the electronic and transport properties of graphene devices. We argue that disorder effects should not be ignored if one were to model graphene nanoscale devices in realistic situations, including arriving at fundamental electronic properties such as Ohm’s law.     

石墨烯/碳纤维/芳纶电磁屏蔽纸的制备与性能研究

本研究以耐高温的芳纶短切纤维和芳纶沉析纤维为纸基纤维材料,导电性优良的碳纤维为导电骨架,石墨烯为电磁屏蔽增强材料,结合抄纸和涂布工艺制备得到石墨烯/碳纤维/芳纶电磁屏蔽纸。结果表明,制备的石墨烯/碳纤维/芳纶电磁屏蔽纸具有“三明治结构”,其厚度为333.9 μm时,在X波段的电磁屏蔽效能SE_T高达70.3 dB,电导率高达1 685 S/m,兼有较好的耐高温性和耐腐蚀性。     

Growth and characterization of Pb0.97La0.02(Zr0.66Sn0.27Ti0.07)O3 antiferroelectric single crystals

Single crystals of Pb_0.97La_0.02(Zr_0.66Sn_0.27Ti_0.07)O₃ (PLZST) with the composition near the morphotropic phase boundary were grown by the flux method. The PbO–PbF₂–B₂O₃ system was used as a solvent. PLZST single crystals with the size of 4–6 mm are obtained and these crystals are slightly translucent after polishing. The splitting of (200) reflection peak indicates that the obtained crystals are of a single phase with tetragonal perovskite structure. The element contents of the grown crystals were measured by inductively coupled plasma atomic emission spectrometry. The chemical composition of the crystals is Pb_0.979La_0.014(Zr_0.666Sn_0.285Ti_0.049)O₃. Thermal properties and dielectric properties of PLZST single crystals were studied. The results show that flux-grown PLZST single crystals exhibit obvious endothermic processes and relaxor behaviors near the phase transition temperatures.