Analysis‐preserving video microscopy compression via correlation and mathematical morphology

The large amount video data produced by multi‐channel, high‐resolution microscopy system drives the need for a new high‐performance domain‐specific video compression technique. We describe a novel compression method for video microscopy data. The method is based on Pearson's correlation and mathematical morphology. The method makes use of the point‐spread function (PSF) in the microscopy video acquisition phase. We compare our method to other lossless compression methods and to lossy JPEG, JPEG2000, and H.264 compression for various kinds of video microscopy data including fluorescence video and brightfield video. We find that for certain data sets, the new method compresses much better than lossless compression with no impact on analysis results. It achieved a best compressed size of 0.77% of the original size, 25× smaller than the best lossless technique (which yields 20% for the same video). The compressed size scales with the video's scientific data content. Further testing showed that existing lossy algorithms greatly impacted data analysis at similar compression sizes. Microsc. Res. Tech. 78:1055–1061, 2015. © 2015 Wiley Periodicals, Inc.     

Predictive Modeling of Surface Roughness in Grinding of Ceramics

The surface roughness represents the quality of ground surface since irregularities on the surface may form nucleation for cracks or corrosion and thus degrade the mechanical properties of the component. The surface generation mechanism in grinding of ceramic materials could behave as a mixture of plastic flow and brittle fracture, while the extent of the mixture hinges upon certain process parameters and material properties. The resulting surface profile can be distinctively different from these two mechanisms. In this article, a physics-based model is proposed to predict the surface roughness in grinding of ceramic materials considering the combined effect of brittle and ductile material removal. The random distribution of cutting edges is first described by a Rayleigh probability function. Afterwards, surface profile generated by brittle mode grinding is characterized via indentation mechanics approach. Last, the surface roughness is modeled through a probabilistic analysis of ductile and brittle generated surface profile. The model expresses the surface finish as a function of the wheel microstructure, the process conditions, and the material properties. The predictions are compared with experimental results from grinding of silicon carbide and silicon nitride workpieces (SiC and Si₃N₄, respectively) using a diamond wheel.     

城市匝道桥抗震分析及加固研究

以绵竹市回澜立交桥为工程实例,结合匝道桥实际震害,采用有限元软件SAP2000对该桥在地震作用下的抗震性能进行了分析计算。研究了匝道桥采用增加截面法和减隔震法进行抗震加固设计后的抗震性能。研究表明:采用增加截面法和减隔震法均能有效满足匝道桥的抗震安全性要求。     

航站楼类高大空间分层空调设计冷负荷减小率的数值分析

高大空间分层空调设计冷负荷通常采用经验系数法计算,对于航站楼类高大空间,经验系数的取值研究较少。以无锡某航站楼的远机位候机厅、近机位候机厅和办票大厅3个高大空间为例,利用CFD软件,在夏季空调设计工况下通过调整送风参数使工作区温度达到室内参数设计要求,求出分层空调冷负荷,并获得分层空调负荷相比于全室空调负荷的减小率,1减去该减小率所得数值即为航站楼类高大空间冷负荷计算所用的经验系数。结果表明,航站楼因围护结构形成的冷负荷占总冷负荷的比例较小且顶部不能设置排风口,分层空调设计冷负荷计算所用的经验系数取0.85~0.95较为合适。     

应对极寒气候的低能耗高舒适村镇住宅设计研究——以扎兰屯卧牛河镇移民新村设计为例

以气候适应性、环境舒适性、经济最优化、技术可行性为原则,运用一系列应对极寒气候的低技术措施对内蒙扎兰屯卧牛河镇新型住宅进行设计研究与实践,并从室内热环境、建筑能耗、经济性等方面进行综合评价。     

化学植筋在隧道主体结构中的应用

简要介绍了化学植筋在隧道工程中的特点,并通过其在施工中的应用详细介绍了化学植筋施工工艺、植筋材料以及拉拔检测方法,最后对化学植筋技术在隧道主体结构中的应用作了总结阐述,为植筋技术的应用积累了经验。     

TMdrive-MVe2高压变频器在本溪思山岭铁矿1800kW/10kV矿井提升机上的成功应用

矿井提升机是立井建设、生产过程中最重要的运输工具,提升系统的好坏,不但直接影响矿井的生产,而且还影响矿井的安全和人身安全,是矿井建设的关键设备。提升机系统里,最关键的部分是液压制动、电控系统和电机变频驱动三大部分,而电机变频驱动部分是对电机原转子回路串电阻调速驱动系统的升级换代,也是本文将要介绍的重点部分。本文详细介绍MVe2系列四象限提升机专用高压变频器在本溪思山岭铁矿矿井提升机上的成功应用。     

碱焙烧法综合利用低品位氧化锌矿

采用碱焙烧法综合利用低品位氧化锌矿。将氧化锌矿与氢氧化钠混匀后焙烧。熟料水溶后过滤分离得到溶出液和滤渣,滤渣回收铁。碳分碱性溶出液制备ZnO、SiO_2产品。碳分溶液制备碳酸钠晶体或苛化碳酸钠溶液,得到轻质碳酸钙产品和氢氧化钠溶液,结晶后返回碱焙烧工序。整个工艺过程实现了低品位氧化锌矿中有价组元的综合提取利用,又实现化工原料的循环利用。碳分产品是ZnO、SiO_2和PbO_2的混合物,有待进一步探索分离手段。     

Effect of surface preparation on electroless Ni‐P plating on carbon fiber‐Reinforced Cyanate Ester Resin Laminate

The effect of surface preparation on electroless Ni‐P plating on carbon fiber reinforced cyanate ester resin laminate has been investigated. Three different surface chemical etching ways were performed, namely: (i) hexanediamine etching, (ii) hexanediamine followed by aniline etching, and (iii) aniline etching. The results indicated that Ni‐P coating on hexanediamine etching or hexanediamine followed by aniline etching pretreated carbon fiber reinforced cyanate ester resin laminates usually tended to be cracked, veined, and low adhesion, while aniline etched laminates showed a homogenous roughing surface which is suitable for subsequently uniform, cellular, and good adhesion Ni‐P plating. POLYM. COMPOS., 37:1161–1166, 2016. © 2014 Society of Plastics Engineers     

西班牙手记之圣家族教堂

<正>巴塞罗那是一座极有个性和魅力的城市。位于市中心有一座骄傲的建筑——圣家族大教堂。这是具有西班牙"怪才、鬼才"之称的建筑大师安东尼奥?高迪的毕生代表作。它始建于1884年,尽管是一座未完工的建筑物,却是被选入"世界文化遗产名录"的建筑。怀着对大师的向往和崇敬,笔者为此膜拜和瞻仰了这份佳作。从地铁口出来,映入眼帘的便是正在修缮中的圣家族大教堂(见图1)。高迪为了突出教堂在城市中的标志性地位,尽可能地保留教堂四周的空地,形成了四星状的广场。这样不仅少占城市用地,而且使得建筑获得醒目