Adaptive edge image enhancement based on maximum fuzzy entropy

Edges carry the most i mportant information in i ma-ges.Ini mages,edges are marked with discontinuities orsignificant variations in intensity or gray levels,provi-dingthe locations of objects'contours[1].Many edge i m-ages that are processed by some gradi…     

73K222AL单片式调制解调器与单片机的接口电路

73K222L是TDK公司新推出的单片式调制解调器,主要用于单片机测控系统。文章分析了它的主要特征,同时结合AT89C51微控制器给出了73K222AL与单片机AT89C51的接口电路及应用程序设计。     

鄂尔多斯盆地延长组长73亚段泥页岩层系岩石类型特征及勘探意义

长期以来,鄂尔多斯盆地长7₃亚段主要被作为单一烃源岩进行研究,涉及到多种岩石类型特征及源储一体方面的研究相对比较薄弱。基于岩性、物性相关分析资料结合测井精细解释,详细论述了长7₃亚段岩石类型特征,并分析了不同类型岩石储集特征及勘探意义。结果表明：①长7₃亚段发育黑色页岩、暗色泥岩、细砂岩、粉砂岩、凝灰岩共5类岩性;②砂质岩类的储集空间主要为长石溶蚀孔和刚性颗粒支撑的残余粒间孔,高长石和石英矿物含量、低碳酸盐胶结、低黏土矿物含量、较大累计厚度的砂岩是长7₃亚段最优的页岩油储层;③富有机质泥页岩是长7₃亚段发育规模最大的岩石类型,储集空间主要为黏土矿物晶间孔、黄铁矿晶间孔及碎屑颗粒粒间孔,有机质孔基本不发育,但常见有机质收缩缝,虽然长7₃亚段泥页岩的孔隙度和孔径都非常小,但也具备一定的储集性能和烃类流体可动性,初步估算长7泥页岩中滞留烃总资源量约为150×10⁸ t,可动烃资源量约为60×10⁸ t;④长7₃亚段砂质岩类和泥页岩含油饱和度普遍高于长7₁、长7₂亚段,进一步优化砂体纵向分布及平面展布特征,提高水平井砂岩钻遇率,加强试采方案研究,确保油水渗吸置换充分,是长7₃亚段砂质岩类页岩油快速建产增产的重要方向;⑤优选脆性指数和含油量高的黑色页岩,研发高效渗吸改善剂,采用压驱采一体化设计,增加缝宽、缝高及提高人工裂缝的导流能力,是实现泥页岩型页岩油动用的重要技术手段。     

白73天然气井钻井技术

白73井是1口深层天然气井,靶径小,位移大,井眼轨迹控制困难,同时天然气井井下安全问题突出,钻井液性能调节难度大。应用动力钻具配合高效PDC钻头钻井技术,保证了井身质量和钻井速度;应用聚磺钾盐钻井液体系及相关安全技术措施,保证了井下安全。该井投产后,用5mm气嘴求产,日产天然气6×104m3,获深层天然气勘探重大突破。     

FANUC系统中车削循环指令比较与应用研究

对FANUC数控车床系统中车削循环复合指令G70,G71,G72和G73的功能进行了比较和研究,阐述了各自的特点,通过实例对其应用进行了分析.     

Fundamental time–domain wind turbine models for wind power studies

One critical task in any wind power interconnection study involves the modelling of wind turbines. This paper provides the most basic yet comprehensive time–domain wind turbine model upon which more sophisticated models along with their power and speed control mechanisms, can be developed. For this reason, this paper concentrates on the modelling of a fixed-speed wind turbine. The model includes turbine's aerodynamic, mechanical, and electrical components. Data for the rotor, drive-train, and electrical generator are given to allow replication of the model in its entirety. Each of the component-blocks of the wind turbine is modelled separately so that one can easily expand the model to simulate variable-speed wind turbines or customise the model to suit their needs. Then, an aggregate wind turbine model, or wind farm, is developed. This is followed by four case studies to demonstrate how the models can be used to study wind turbine operation and power grid integration issues. Results obtained from the case studies show that the models perform as expected.     

鄂尔多斯盆地长73亚段泥页岩型页岩油赋存状态与有机地球化学特征

页岩油的赋存状态与有机地球化学特征对页岩油的甜点区评价与资源潜力评估具有重要意义。为明确鄂尔多斯盆地延长组长7₃亚段泥页岩中页岩油的赋存位置、含油量、族组分和饱和烃分布特征,选取长7₃亚段的泥页岩岩心样品进行多溶剂连续分级抽提、低温氮气吸附—解吸、荧光薄片鉴定、场发射扫描电镜和饱和烃气相色谱—质谱等分析。结果表明：长7₃亚段泥页岩型页岩油主要赋存于页理缝和有机质孔中;页岩油的含油总量大于10 mg/g,其中游离油约占50％,吸附油约占20％;游离油、吸附油含量与有机质丰度之间呈较好的正相关关系,表明有机质丰度是控制页岩油分布的主要因素;游离油含有较多的饱和烃和轻质组分,而吸附油则含有较多的非烃与沥青质等重质组分。此外,与暗色泥岩相比,黑色页岩具有广泛发育的页理缝和有机质孔,游离油含量较高,黑色页岩可能是更有利于页岩油勘探开发的岩相类型。     

复合固定循环指令的混合编程

文章通过分析G71在粗车外径存在的问题,提出了一种G73与G71混合编程的NC编程的新方法,较好地解决了外径加工时出现的零件形状误差的问题.     

基于FANUC 0i系统数控车床椭圆加工方法的探讨

在数控车床加工中,常常使用宏程序进行椭圆类零件的加工。本文主要介绍了在FANUC 0i系统中,针对椭圆类零件的编程加工提出的3种方法:G71指令加工椭圆、G73指令加工椭圆和G90指令加工椭圆。阐述了3种方法各自的特点和适用范围,并给出了加工程序以供参考。     

Surface Characterization of 7075-T73 Aluminum Exposed to Anodizing Pretreatment Solutions

Localized corrosion damage in Type 7075-T73 aluminum alloy was investigated for various anodizing pretreatment solutions. The postexposure surface corrosion was characterized by use of scanning electron microscopy (SEM) examination. In addition, SEM and energy dispersive spectroscopy (EDS) were used for second-phase (constituent) particle identification for those found to induce pitting corrosion during solution exposure. The pitting mechanisms were identified as circumferential where the particles are noble with respect to the matrix phase and by selective dissolution where they are anodic. The designated category-1 degreasing and category-2 inhibited alkaline solutions did not initiate localized corrosion after 1200 s exposures. However, the category-3 high-pH NaOH and category-4 low-pH HNO₃ based solutions were found to initiate pitting attack, with the NaOH being significantly more aggressive. It was hypothesized that if the pits initiating during the pretreatment exposures were beyond a threshold size, on the order of 10-20 μm, a higher current density existed at these locations during subsequent electrochemical processes, thus resulting in larger and deeper pit structures. These surface defects are of primary concern with respect to accelerated fatigue crack nucleation. For smaller pits, on the order of 1-5 μm, the anodic process had a smoothing affect where the film growth tended to passivate the pits.