离子法入机Ⅶ Sta平台向掺杂工艺的无缝可变换性

离子注入机ⅦSta平台对≤130 nm尺寸CMOS工艺在整个能量和剂理范围提供单片注入.这些注入机的特征是硬件和设计原理通用,并包含离子束注入角控制、剂量测定和终端站设计.这种方法对重叠剂量范围能使工艺可完全互换,并对引起制造所有权成本(COO)降低提供了最大的灵活性.一个完整工艺的透彻性需要剂量形貌特征精确匹配,并很好地说明这一能力、晕圈效应、VT和延展注入.此外,也证实了ⅦSta平台的单片设计消除了缺陷来源,确保了无风险工艺互换.     

Rheokinetic studies and compressive response of high performance polybenzoxazine syntactic foams

Polybenzoxazines are finding increasing usage in demanding applications where high temperature stability is required, especially in the field of aerospace. In this work, thermally stable bisphenol F-based polybenzoxazine [poly(BF-a)] syntactic foams containing varying volume fractions (30–60%) of hollow glass microballoons (HGMs) were prepared and their mechanical response in the quasi-static regime was established. The effect of introducing glass microballoons on the curing profile of benzoxazine resin was studied using both nonisothermal differential scanning calorimetry and rheometry. Temperature-sweep experiments were performed to arrive at the optimal processing window of the benzoxazine-glass microballoons formulations, particularly in terms of viscosity, gelation temperature, and time. Thermally accelerated ring-opening polymerization of the benzoxazine resin led to complete curing of the syntactic foam formulations, as assessed by calorimetric studies. The thermal degradation behavior of the poly(BF-a)/HGM was studied using thermogravimetric analysis. As expected, the density of the syntactic foam specimens decreased with increasing microballoon content. Maximal increase in the specific compressive properties of the poly(BF-a)/HGM samples was observed in formulations containing 40% volume fraction of glass microballoons. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47234.     

Poly(dimethylsiloxane)‐toughened syntactic foams

The potential of preformed elastomers as a toughening agent for epoxy–glass syntactic foam has been explored. Poly(dimethylsiloxane) microspheres were prepared by suspension polymerization. The microsphere dimensions could be varied from 58 to 255 µm by tuning the reaction parameters, particularly the stirring speed and feed concentration. Rheological studies indicated that the introduction of microballoons led to an increase in the viscosity of the resin, with the extent being proportional to the microballoon content. The zero shear viscosity increased from ～10³ mPa s at 30 °C to 10⁵ mPa s as the microballoon loading was increased to 40%. Syntactic foams containing varying amounts of microballoons (40–60% v/v) were prepared, and an analogous set of toughened foams were also prepared, where a fraction of the microballoons was replaced with poly(dimethylsiloxane) microspheres (3–7%). The effect of increasing dimensions of the elastomeric microspheres on the mechanical properties was also studied. The improvement in properties was more pronounced when the microsphere size was equivalent to that of the constituent microballoons. An improvement of 40% and 185% in flexural strength and flexural toughness was observed upon the introduction of poly(dimethylsiloxane) microspheres of optimal dimensions (diameter ～63 µm, 5% loading), without any undesirable increase in foam density. However, the compressive properties remained practically unaltered. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45882.     

Cost optimization of process tolerance allocation-a tree based approach

Tolerance transfer techniques are used extensively for allocation of tolerances for each machining operation in the process sequence, and hence are used to coordinate the process planning and the design activities in the evolution of a new product. This paper deals with an extended approach to allocate process tolerances based on a tree topology called technologically and topologically related surfaces (TTRS) and its subsequent extension to cost optimization. The benefit of this approach is that equations are generated explicitly with regard to tolerance transfer. These have been exploited by implementing the cost function in the generated explicit equations and subsequent optimization. The TTRS approach has been extended which scores over the limitations of some of the already existing techniques in that, it is optimal with respect to two factors namely, cost of producing the required tolerances, as also the process capability of the machines involved in producing the part. This technique has been proved practically feasible as it has been implemented in an industry. To enable a better view of the advantages of the approach, a comparative study with the existing techniques has been carried out in addition to a simulation using the Monte Carlo method.     

Optimizing Recursive Information Gathering Plans in EMERAC

In this paper we describe two optimization techniques that are specially tailored for information gathering. The first is a greedy minimization algorithm that minimizes an information gathering plan by removing redundant and overlapping information sources without loss of completeness. We then discuss a set of heuristics that guide the greedy minimization algorithm so as to remove costlier information sources first. In contrast to previous work, our approach can handle recursive query plans that arise commonly in the presence of constrained sources. Second, we present a method for ordering the access to sources to reduce the execution cost. This problem differs significantly from the traditional database query optimization problem as sources on the Internet have a variety of access limitations and the execution cost in information gathering is affected both by network traffic and by the connection setup costs. Furthermore, because of the autonomous and decentralized nature of the Web, very little cost statistics about the sources may be available. In this paper, we propose a heuristic algorithm for ordering source calls that takes these constraints into account. Specifically, our algorithm takes both access costs and traffic costs into account, and is able to operate with very coarse statistics about sources (i.e., without depending on full source statistics). Finally, we will discuss implementation and empirical evaluation of these methods in Emerac, our prototype information gathering system.     

光学传输网络

光学网络技术的发展正推动整个网络向可支持更多业务的“全光”网络前进。在未来的传输基础设施中，服务供应商必须能够支持业务的快速增长，同时还要使成本保持尽可能低。在高速传输网络结构方面存在许多成帧技术和标准。其中，G．709是可为大多数通用传输协议提供全面的性能监控增强功能的主要标准。本文讨论的是向超越SONET／SDH的光学传输网络的演化，也包括了对与实施G．709兼容帧结构的数字封装（DigitalWrapping）设备的光学网络和优化结构相关的行业标准的讨论。本文还涉及并讨论了可无缝集成任意业务（包括TDM、IP、ATM和SDH／SONET）的下一代网络结构。     

Gyrase ATPase Domain as an Antitubercular Drug Discovery Platform: Structure‐Based Design and Lead Optimization of Nitrothiazolyl Carboxamide Analogues

In this study, we explored the pharmaceutically underexploited mycobacterial gyrase ATPase (GyrB) domain as a template for a structure‐based virtual screening of our in‐house (BITS Pilani) compound collection to discover new inhibitors targeting Mycobacterium tuberculosis (M.tb.) The hit identified was further customized by using a combination of molecular docking and medicinal chemistry strategies to obtain an optimized analogue displaying considerable in vitro enzyme efficacy and bactericidal properties against the M.tb. H₃₇Rv strain. The binding affinity of the ligand toward the GyrB domain was reascertained by differential scanning fluorimetry experiments. Further evaluation of the hERG toxicity (a major limitation among the previously reported N‐linked aminopiperidine analogues) indicated these molecules to be completely devoid of cardiotoxicity, a significant achievement within this class.     

Epoxy-Filled Microcapsules by Interfacial Engineering

In this paper, we demonstrate the successful application of interfacial engineering toward the preparation of epoxy-filled microcapsules. The approach relies on the preferential reaction of polydimethylsilicone insoluble epoxy resin and amine-based hardener to form a cross-linked spherical shell at the interface. Among other features, tailorability is the biggest advantage of this route as both the core content and particle dimensions can be altered by varying the experimental parameters, i.e., stirring speed and resin:hardener ratio. Spherical microcapsules with a core content of 25% were obtained when the reaction was carried out under optimal conditions.     

Optimization of implant anneals to improve transistor performancein a 0.15 μm CMOS technology

The impact of including a rapid thermal anneal step after the extension implants is examined for a 0.15 μm CMOS process. SIMS data will verify that shallower junctions can be obtained with only a single anneal cycle after the source-drain implants, implying that transient enhanced diffusion is minimal for this technology. Further, transistor data indicates that improved CMOS device performance can be obtained without the extension anneal cycle