大规模IP分割与自构成处理技术研究

不同的数据链路之间若要通信必须采取网络地址协议,D-L(数据链路)层根据相同数据流进行分类标记,根据不同D-L层不同的特征进行抽象,D-L的地址被抽象为网络地址。对IP的上一层,不管二层D-L层使用以太网还是无线局域网或点对点控制,都被当作一种处理手段和方式,大规模网络技术的研究是当前研究的热点话题,对未来人工智能、大数据运算、云服务技术等均有重要的意义和作用,如何将大规模网络运用好,是掌握各个关键主流技术的基石,因此研究IP分割及自构成处理是主要研究的关键技术。

星载处理设备软件在轨重构技术研究

文章以我国星上处理设备的软件在轨可重构为需求,分别从配置数据传输途径、可重构处理设备构成、上行加载帧结构以及软件重构技术等方面开展了设计研究,所设计的硬件处理设备和重构软件通过了最终的系统重构功能验证测试。

KJ2000煤矿瓦斯监控系统原理及常见故障处理

在生产能力强的老矿中,矿井内水、冲击地压以及煤与瓦斯突出的灾害时有发生,因此可通过KJ2000煤矿瓦斯监控系统来对低浓度瓦斯进行检测控制,以此来实时了解瓦斯超限、断电状态和局部通风机、注水泵、瓦斯抽放泵开关状态。相比较其他监控系统来说,KJ2000系统的运用不仅能升级监控的运算速度,增加架空系统的存储,还有存在其他功能。

Surface treatment effect on the photocatalytic hydrogen generation of CdS/ZnS core-shell microstructures

CdS/ZnS core-shell microparticles were prepared by a simple two-step method combining ultrasonic spray pyrolysis and chemical bath deposition.The core-shell structures showed enhanced photocatalytic properties compared with those of CdS or ZnS spherical particles.CdS/ZnS photocatalysts with different amount of ZnS loaded as shells were prepared by adjusting the concentrations of Zn and S precursors during synthesis.The optical properties and photocatalytic activity for hydrogen production were investigated and the amount of ZnS loaded as shell was optimized.Thermal annealing and hydrothermal sulfurization treatments were applied to the core-shell structure and both treatments enhanced the material＇s photocatalytic activity and stability by eliminating crystalline defects and surface states.The result showed that thermal annealing treatment improved the bulk crystallinity and hydrothermal sulfurization improved the surface properties.The sample subjected to both treatments showed the highest photocatalytic activity.These results indicate that CdS/ZnS core-shell microspheres are a simple structure that can be used as efficient photocatalysts.The hydrothermal sulfurization treatment may also be a useful surface treatment for metal sulfide photocatalysts.The simple two-step method provides a promising approach to the large-scale synthesis of core-shell microsphere catalysts.

色彩在摄影中的运用

在摄影这一行业中,对于影调和色彩的把控是成功作品展现情感和整个作品氛围的重要手法。拍摄作品的人首先要了解创作目的,再将拍摄角度和光线结合成需要的取景范畴,并在拍摄时调整整个画面的明暗程度、色调还有饱和度,用它们来更好地展现出整个作品所要表达的感情。本文中心就是对拍摄过程中影响到视觉的影调,包括拍摄人像时对色调的把控和分析,以期为学习摄影的人增加多种多样的摄影拍摄技巧。

人像摄影中影调与色彩的运用技巧

对影调和色彩的控制是摄影作品表达情感、烘托气氛的重要手段,摄影师首先应明确创作意图,然后利用改变拍摄角度、光线构成和取景范围等内容,控制好画面的明暗层次、色别、饱和度以更好地表现主题和传达情感。本文重点就影调对视觉的影响、人像摄影中色调设计、影调构成等进行分析,以便为学者提供多种影调与色彩应用技巧与经验。

Modifying the acidity of H-MOR and its catalytic carbonylation of dimethyl ether

Among the reactions catalyzed by zeolites there are some that exhibit high selectivity due to the spatial confinement effect of the zeolite framework.Tailoring the acidity,particularly the distribution and location of the Bronsted acid sites in the zeolite is effective for making it a better catalyst for these reactions.We prepared a series of H-mordenite（H-MOR） samples by varying the composition of the sol-gel,using different structure directing agents and post-treatment.NH3-TPD and IR characterization of adsorbed pyridine were employed to determine the amount of Bronsted acid sites in the 8-membered ring and 12-membered ring channels.It was shown that controlled synthesis was a promising approach to improve the concentration of Bronsted acid sites in MOR,even with a low Al content.Using an appropriate composition of Si and Al in the sol-gel favored a higher proportion of Bronsted acid sites in the 8-membered ring channels.HMI as a structure-direct agent gave an obvious enrichment of Bronsted acid sites in the 8-membered ring.Carbonylation of dimethyl ether was used as a probe reaction to examine the modification of the acid properties,especially the Bronsted acid sites in the 8-membered ring channels.There was a linear relationship between methyl acetate formation and the number of Bronsted acid sites in the 8-membered ring channels,demonstrating the successful modification of acid properties.Our results provide information for the rational design and modification of zeolites with spatial constraints.

High-extensible scene graph framework based on component techniques

In this paper, a novel component-based scene graph is proposed, in which all objects in the scene are classified to different entities, and a scene can be represented as a hierarchical graph composed of the instances of entities. Each entity contains basic data and its operations which are encapsulated into the entity component. The entity possesses certain behaviours which are responses to rules and interaction defined by the high-level application. Such behaviours can be described by script or behaviours model. The component-based scene graph in the paper is more abstractive and high-level than traditional scene graphs. The contents of a scene could be extended flexibly by adding new entities and new entity components, and behaviour modification can be obtained by modifying the model components or behaviour scripts. Its robustness and efficiency are verified by many examples implemented in the Virtual Scenario developed by Peking University.

Formation mechanism and wear behavior of gradient nanostructured Inconel 625 alloy

The formation mechanism and wear behavior of a gradient nanostructured(GNS) Inconel 625 alloy were investigated using SEM, TEM and ball-on-disc sliding wear tester. The results show that surface mechanical grinding treatment(SMGT) induced an approximately 800 μm-deep gradient microstructure, consisting of surface nano-grained,nano-laminated, nano-twined, and severely deformed layers, which resulted in a reduced gradient in micro-hardness from 6.95 GPa(topmost surface) to 2.77 GPa(coarse-grained matrix). The nano-grained layer resulted from the formation of high-density nano-twins and subsequent interaction between nano-twins and dislocations. The width and depth of the wear scar, wear loss volume, and wear rate of the SMGT-treated sample were smaller than those of untreated coarse-grained sample. Moreover, the wear mechanisms for both samples were mainly abrasive wear and adhesive wear, accompanied with mild oxidation wear. The notable wear resistance enhancement of the GNS Inconel 625 alloy was attributed to the high micro-hardness, high residual compressive stress, and high strain capacity of the GNS surface layer.

Trends of Communication Processors

Processors have been playing important roles in both communication infrastructure systems and terminals.In this paper,both application specific and general purpose processors for communications are discussed including the roles,the history,the current situations,and the trends.One trend is that ASIPs(Application Specific Instruction-set Processors) are taking over ASICs(Application Specific Integrated Circuits) because of the increasing needs both on performance and compatibility of multi-modes.The trend opened opportunities for researchers crossing the boundary between communications and computer architecture.Another trend is the serverlization,i.e.,more infrastructure equipments are replaced by servers.The trend opened opportunities for researchers working towards high performance computing for communication,such as research on communication algorithm kernels and real time programming methods on servers.

浅析陈洪绶《张深之正北西厢记》插图版画

中国的木刻版画历史悠久,发展到明代,文人画家开始参与版画的创作,出现了很多质量上乘的作品,陈洪绶《张深之正北西厢记》插图版画就是其中的经典。本文从版画的艺术特性出发,从画面构图,黑白关系,平面构成等角度对这套作品进行分析和解读,使读者更加深刻理解这一套作品的艺术价值。

Evolution of microstructure and high temperature tensile properties of as-extruded Ti Bw reinforced near-α titanium matrix composite subjected to heat treatments

The Ti Bw reinforced near-α titanium matrix composite（Ti-5.8 Al-3.4 Zr-4.0 Sn-0.4 Mo-0.4 Nb-0.4 Si-0.06 C） was successfully synthesized by powder metallurgy and hot extrusion route. The effects of solution and aging temperature on the microstructure and high temperature tensile properties of the composite were investigated. The results revealed that the fine transformed β phase can be obtained by the solution treatment at β phase region and aging treatment, no other precipitates were observed. The α2 phase（Ti3 Al） can be acquired when the solution treated at α＋β phase region followed by aging treatment. With increasing the aging temperature from 500 to 700℃ for 5 h, the size of α2 precipitates increases from about 5 to about 30 nm. The Ti Bw are stable without any interfacial reaction during the heat treatments. The high temperature tensile properties show that the composite performed by solution and aging treatment exhibits good strengthening effects. With increasing the aging temperature from 500 to 700℃, the strength of the composite increases at the expense of elongation due to the increment of α2 precipitates.The strength of the composite at 600℃ increases by 17% to 986 MPa after 1000℃/2 h/AC and 700℃/5 h/AC heat treatment.