Shape Analysis with Subspace Symmetries

We address the problem of partial symmetry detection, i.e., the identification of building blocks a complex shape is composed of. Previous techniques identify parts that relate to each other by simple rigid mappings, similarity transforms, or, more recently, intrinsic isometries. Our approach generalizes the notion of partial symmetries to more general deformations. We introduce subspace symmetries whereby we characterize similarity by requiring the set of symmetric parts to form a low dimensional shape space. We present an algorithm to discover subspace symmetries based on detecting linearly correlated correspondences among graphs of invariant features. We evaluate our technique on various data sets. We show that for models with pronounced surface features, subspace symmetries can be found fully automatically. For complicated cases, a small amount of user input is used to resolve ambiguities. Our technique computes dense correspondences that can subsequently be used in various applications, such as model repair and denoising.     

沃尔夫绍夫绿色城市住宅 奥地利维亚纳

正近日,由GERNER GERNER PLUS设计的一座住宅楼在维也纳第十二区竣工,这座住宅楼是该事务所参加邀请赛作品之一,不仅为住户提供高质量生活空间,而且还附送一个宽敞的公共小吃花园。这是一座全新的充满工业风的LOFT公寓楼,四周建筑都大多经过改建,内含多个公寓,面积从45到77平方米不等,有出租屋、自有房也有养老福利房。现存建筑内部有部分在建造过程中毁坏,但房间高度仍然得以保留,这就给了房间LOFT公寓元素。所有房间都被设计成统一的立方体型,带有拱形天花板,也进一步增强了工业风感觉。整栋楼共有60间公寓房,一     

An assessment of modula

Wirth has recently published a new programming language called Modula which he suggests is suitable for the programming of process control systems, computerized laboratory equipment and input/output device drivers. The authors have written a compiler for Modula running on a PDP-11 and generating object code for the same machine. Their experience in writing device drivers for a number of PDP-11 devices is reported, including simple mains frequency clocks, disks, CAMAC and a graphics processor. Some difficulties arose during the writing of these programs; these are investigated and solutions proposed, either within the existing language or by minor modifications to the language. The study shows the extent to which Modula meets the requirements for a general purpose real-time systems-implementations programming language; areas of deficiency are noted.     

Tissue preparation in combined scapula flap for microsurgical reconstruction of defects of the oromaxillofacial area]

Nowadays, in congenital or acquired large oro-maxillofacial defects microsurgical reconstruction is mainly performed by revascularized osseous, osteocutaneous, or osteomyocutaneous distant flaps. The aim of reconstruction includes not only restoration of stable continuity and esthetic contour, but also the restoration of a functioning "chewing organ". For reconstruction in maxillary and midface defects, we prefer the scapular flap for a single-step reconstruction. Tissue prefabrication results in osseointegrated implants and thin mucosal linings with stable soft tissue conditions at the time of microsurgical reconstruction. Following dental restoration, full oral function is given. This single-stage procedure improves the psychosocial situation of the patient considerably when compared with conventional multi-stage reconstruction.     

The Theory of Fexprs is Trivial

We provide a very simple model of a reflective facility based onthe pure -calculus, and we show that its theory of contextual equivalenceis trivial: two terms in the language are contextually equivalent iff theyare -congruent.     

Symmetry Detection Using Feature Lines

In this paper, we describe a new algorithm for detecting structural redundancy in geometric data sets. Our algorithm computes rigid symmetries, i.e., subsets of a surface model that reoccur several times within the model differing only by translation, rotation or mirroring. Our algorithm is based on matching locally coherent constellations of feature lines on the object surfaces. In comparison to previous work, the new algorithm is able to detect a large number of symmetric parts without restrictions to regular patterns or nested hierarchies. In addition, working on relevant features only leads to a strong reduction in memory and processing costs such that very large data sets can be handled. We apply the algorithm to a number of real world 3D scanner data sets, demonstrating high recognition rates for general patterns of symmetry.     

热轧态Si—Mn双相钢的冲击韧度

研究了热轧态Ｓｉ－Ｍｎ双相钢的冲击韧度。试验结果表明，形变态螺栓的冲击韧度已基本符合ＧＢ３０９８．１－８２的要求，经４９０℃回复９０ｍｉｎ后，冲击功达约１２０Ｊ，且拉断力符合ＧＢ３０９８．１－８２的要求，对试验数据进行了计算机拟合。     

Replaceable Substructures for Efficient Part‐Based Modeling

A popular mode of shape synthesis involves mixing and matching parts from different objects to form a coherent whole. The key challenge is to efficiently synthesize shape variations that are plausible, both locally and globally. A major obstacle is to assemble the objects with local consistency, i.e., all the connections between parts are valid with no dangling open connections. The combinatorial complexity of this problem limits existing methods in geometric and/or topological variations of the synthesized models. In this work, we introduce replaceable substructures as arrangements of parts that can be interchanged while ensuring boundary consistency. The consistency information is extracted from part labels and connections in the original source models. We present a polynomial time algorithm that discovers such substructures by working on a dual of the original shape graph that encodes inter‐part connectivity. We demonstrate the algorithm on a range of test examples producing plausible shape variations, both from a geometric and from a topological viewpoint.     

武钢焦化氨水回收设备腐蚀研究

通过X射线粉末衍射（XRD）分析和x射线光电子能谱（XPS）分析对武钢焦化氨水回收设备腐蚀问题进行研究,采用全浸动态挂片试验和极化曲线法研究Q235-A碳钢试样在模拟现场工况条件下的腐蚀情况。结果表明,武钢焦化氨水回收设备的腐蚀主要为硫离子和氰根离子所致。