Catalyst Deactivation During Rhodium Complex-Catalyzed Propargylic C−H Activation

Detailed mechanistic investigations on our previously reported synthesis of branched allylic esters by the rhodium complex-catalyzed propargylic C−H activation have been carried out. Based on initial mechanistic studies, we present herein more detailed investigations of the reaction mechanism. For this, various analytical (NMR, X-ray crystal structure analysis, Raman) and kinetic methods were used to characterize the formation of intermediates under the reaction conditions. The knowledge obtained by this was used to further optimize the previous conditions and generate a more active catalytic system.     

On the Cohomology of Categories, Universal Toda Brackets and Homotopy Pairs

A category of homotopy pairs is characterised by a cohomology class which generalizes the notion of Toda bracket. Explicit computations of such cohomology classes are described.     

Two-Dimensional Test Data Compression for Scan-Based Deterministic BIST

In this paper a novel architecture for scan-based mixed mode BIST is presented. To reduce the storage requirements for the deterministic patterns it relies on a two-dimensional compression scheme, which combines the advantages of known vertical and horizontal compression techniques. To reduce both the number of patterns to be stored and the number of bits to be stored for each pattern, deterministic test cubes are encoded as seeds of an LFSR (horizontal compression), and the seeds are again compressed into seeds of a folding counter sequence (vertical compression). The proposed BIST architecture is fully compatible with standard scan design, simple and flexible, so that sharing between several logic cores is possible. Experimental results show that the proposed scheme requires less test data storage than previously published approaches providing the same flexibility and scan compatibility.     

Mixed-Mode BIST Using Embedded Processors

In complex systems, embedded processors may be used to run software routines for test pattern generation and response evaluation. For system components which are not completely random pattern testable, the test programs have to generate deterministic patterns after random testing. Usually the random test part of the program requires long run times whereas the part for deterministic testing has high memory requirements.In this paper it is shown that an appropriate selection of the random pattern test method can significantly reduce the memory requirements of the deterministic part. A new, highly efficient scheme for software-based random pattern testing is proposed, and it is shown how to extend the scheme for deterministic test pattern generation. The entire test scheme may also be used for implementing a scan based BIST in hardware.     

TPMS压力传感器信号调节解决方案

轮胎压力监测系统（TPMS）能够向汽车驾驶员提供实际的轮胎压力信息，在低于指定压力范围时发出预警，并帮助汽车驾驶员轻松便利地保持轮胎压力，以加强行车安全。 根据美国TREAD法案，TPMS应能够根据冷膨胀压力推荐值，准确检测出压力低于该值20％的车辆轮胎。     

Total synthesis of the antitumor active pyrrolo[2,1-a]isoquinoline alkaloid (±)-crispine A

Addition of a propargyl Grignard reagent to 3,4-dihydro-6,7-dimethoxyisoquinoline, silver(I)-promoted oxidative cyclization, and chemoselective hydrogenation of the pyrrole ring provide a simple three-step route to the antitumor active pyrrolo[2,1-a]isoquinoline alkaloid (±)-crispine A.     

Mass in Kähler Geometry

We prove a simple, explicit formula for the mass of any asymptotically locally Euclidean (ALE) Kähler manifold, assuming only the sort of weak fall-off conditions required for the mass to actually be well-defined. For ALE scalar-flat Kähler manifolds, the mass turns out to be a topological invariant, depending only on the underlying smooth manifold, the first Chern class of the complex structure, and the Kähler class of the metric. When the metric is actually AE (asymptotically Euclidean), our formula not only implies a positive mass theorem for Kähler metrics, but also yields a Penrose-type inequality for the mass.