A brain-enriched human FC96 protein shows a close sequence similarity to the dictyosielium discoideum protein coronin, which is implicated in cell motility, cytokinesis, and phagocytosis. A phylogenetic tree analysis ...
A brain-enriched human FC96 protein shows a close sequence similarity to the dictyosielium discoideum protein coronin, which is implicated in cell motility, cytokinesis, and phagocytosis. A phylogenetic tree analysis revealed
The Pt/Ta diffusion barrier using hybrid conductive oxide (ruO2) fordynamic random access memory and ferroelectric random access memory capacitor bottom electrodes is proposed. The thermal stability of Pt+ruO2 (50 nm...
The Pt/Ta diffusion barrier using hybrid conductive oxide (ruO2) fordynamic random access memory and ferroelectric random access memory capacitor bottom electrodes is proposed. The thermal stability of Pt+ruO2 (50 nm)/Ta+ruO2 (50 nm)/TiSi2/poly-Si/SiO2/Si contact system is investigated and compared to that of the Pt(50 nm)/Ta(50 nm)/TiSi2/poly-Si/SiO2/Si contact system. The Pt+ruO2/Ta+ruO2/TiSi2/poly-Si/SiO2/Si contact system sustained its structure up to 650 °C, whereas Pt/Ta/TiSi2/poly-Si/SiO2/Si contact system was completely degraded after annealing at 650 °C. In the former case, the addition of ruthenium dioxide (ruO2) into the Pt bottom electrode layer led to retardation of the oxygen indiffusion, preventing the indiffusion of oxygen up to 650 °C. In addition, the Ta+ruO2 diffusion barrier showed an amorphous structure andruO2 is bound to the Ta matrix, inhibiting the interdiffusion of O, Pt, and Si through grain boundaries which can act as fast diffusion paths up to high temperatures. Therefore, it appeared that the barrier properties of Pt/Ta diffusion barrier are improved by using hybrid conductive oxide (ruO2).
reduced manning is the process (and the result) of removing human functions from a system while retaining or improving system operability and effectiveness. reliability and maintainability characterize a system's ...
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reduced manning is the process (and the result) of removing human functions from a system while retaining or improving system operability and effectiveness. reliability and maintainability characterize a system's operability and effectiveness. reduced manning impacts system reliability by changing the characteristics of (1) human error associated with system operation and maintenance, (2) time to repair failed components, and (3) mean-time-between-failures (MBTF) in a reduced manning environment. Simply reducing manning without compensating for system dependence on human involvement generally has a negative impact on system maintainability. Methods to address this include (1) human-system integration design of maintenance interfaces and (2) design of operations activities that are closely related to device failures. Afterdemonstrating reliable performance through testing and operation, ship commanders can be assured that fewer people can effectively operate and maintain Navy ships and systems.
We propose a robust estimatordesign to solve the forward kinematics in 6 dOF motion bed (Stewart platform). The stability of the proposed estimator is proved via Lyapunov stability analysis and the estimator guarante...
作者:
Arntson, SLind, WTurner, JJBlaiklock, WCTedesco, MStephen G. Arntson is an independent consultant. A degree Naval Architect
he has over 38 years of experience in the design construction and maintenance of surface ships. His experience includes 28 yeus with the Naval Sea Systems Command Naval Ship Engineering Centerl Bureau of Ships specializing in the structural design of Naval surface ships and 7 years with ABS Specializing in the application of commercial ship design practices. Most recently he worked with both NASSCO and ABS MZ the Arsenal Ship Program. Steve was very active with the Ships Structure Committee in developing R&D programs for ship structure and he is a member of the ASNE Journal Committee. Steve received a BS in Mechanical Engineering (Naval Architecture Option) from Virginia Polytechnic Institute in 1964. He is a member of the ASNE TAU BETA PI PI TAU SIGMA and PHI KAPPA PHI. William 1. Lind joined ABS in 1992 after ten years with Sparkman and Stephens
Inc. He is currently ABS Amekas Manager of Engineering jm New Orleans and Cleveland. Both ofices conduct plan reviews for militavy commercial and private marine craft fm self-propelled vessels under 300 feet in length and bargus unlimited in length. As Vice-Chaimn ojthe Western Rivers Technical Committee Great Lakes Technical Committee and the Small Vessel Committee Bill participated in the writing of the 1997 ABS Guide for Building and Classing High Speed Craft and the 1997 ABS Rules for Building and Classing Steel Vessels Under 9OM. Bill received an MBA from Florida Atlantic University in 1995 a BS in Mechanical Engineering from New York Institute of Technology in 1986 and a BA in Histoy from Colgate University in 1976. He is Chaimn of SNAME HS-9 Composite Panel Testing & Fire Protection and a member of ASNE. John J. Turner is Senior Vice President of SYNTEK Technologies
Inc. in Arlington Virginia. SYNTEK specializes in activities of a highly technical nature supporting both industry and government in domestic and international markets. He is a registered Professional Engineer
The defense advancedresearch Project Agency (dArPA), in conjunction with the U.S. Navy, initiated a research program for the design and construction of a distinctive warship for the 21st century known as the Arsenal ...
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The defense advancedresearch Project Agency (dArPA), in conjunction with the U.S. Navy, initiated a research program for the design and construction of a distinctive warship for the 21st century known as the Arsenal Ship. By using an innovative development and acquisition approach it was hoped to streamline the procurement process andreduce costs. In an environment where budgets are being cut, both industry and Government were challenged to develop, design, and produce the innovative ship andrelated mission systems to meet specific performance capabilities within strict affordability constraints. A key element of this innovative acquisition approach was a new certification scheme designed to replace the traditional test and evaluation (T&E) and acceptance process. The purpose of this paper is to describe the development of the certification plan during Phase LI of the Arsenal Ship program by the American Bureau of Shipping and the contending Shipyard teams, and to discuss the potential benefits of this alternative certification approach. Although the Arsenal Ship program was canceled late in 1997, insight derived from the exploration of new certification concepts could benefit future design and building programs.
Functional simulation is the most widely used method fordesign verification. At various levels of abstraction, e.g., behavioral, register-transfer level and gate level, the designer simulates the design using a large...
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ISBN:
(纸本)9780818675973
Functional simulation is the most widely used method fordesign verification. At various levels of abstraction, e.g., behavioral, register-transfer level and gate level, the designer simulates the design using a large number of vectors attempting to debug and verify the design. A major problem with functional simulation is the lack of good metrics and tools to evaluate the quality of a set of functional vectors. Metrics used currently are based on instruction counts and are quite simplistic. designers are forced to use ad-hoc methods to terminate functional simulation, e.g. CPU time limitations. We propose a new metric for measuring the extent of design verification provided by a set of functional simulation vectors. This metric is universal, and can be used uniformly for all designs. Our metric computes observability information to determine whether effects of errors that are activated by the program stimuli can be observed at the circuit outputs. We provide preliminary experimental evidence that supports the validity of the proposed metric. We believe that using this metric in design verification will result in higher-quality functional checking. tests and improved correctness
High strain rate superplasticity was found in a super-rapidly-solidified aluminum alloy, an as-extruded Al-Si-Fe-Mg-Cu-Ni-Mo alloy fabricated by warm consolidation of its powders which was developed to be a fine-grain...
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High strain rate superplasticity was found in a super-rapidly-solidified aluminum alloy, an as-extruded Al-Si-Fe-Mg-Cu-Ni-Mo alloy fabricated by warm consolidation of its powders which was developed to be a fine-grained structure of 1.4 μm in size with a homogeneous distribution of fine Si particles of 1 μm in size. The large elongation of 275% was recorded at 1 × 10?1 s?1 and at 803K, at which a high m value of 0.5 was obtained. The superplastic strain rate for the Al-Si-Fe-Mg-Cu-Ni-Mo alloy was two or three orders of magnitude higher than that for a conventional superplastic alloy. This result shows clearly a new possibility fordevelopment of high strain rate superplasticity in a wear-resisting Al-Si alloys fabricated by super-rapidly-solidified powders.
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In this study, we investigated the effects of the addition of CF4, Cl2, and N2 gases to oxygen electron cyclotron resonance (ECr) plasma on the reactive ion etching (rIE) properties of ruO2 film such as etch rate, sel...
In this study, we investigated the effects of the addition of CF4, Cl2, and N2 gases to oxygen electron cyclotron resonance (ECr) plasma on the reactive ion etching (rIE) properties of ruO2 film such as etch rate, selectivity, and etched profile. The concentration of the etching species in the plasma was analyzed with an optical emission spectroscopy (OES) and a quadrupole mass spectrometer (QMS). The etch product was also examined with QMS. p]The addition of a small amount of CF4, Cl2, or N2 to the O2 plasma increases the concentration of oxygen radicals and accordingly increases the etch rate of the rUO2 films appreciably. The etch rate of the ruO2 film was enhanced more with the addition of a small amount of CF4 and CI2 than with the addition of N2. On the contrary, the etched profile obtained in O2/N2 plasma was superior, without any damaged layer at the sidewall, to O2/CF4 and O2/Cl2 plasma. The selectivity of ruO2 to Si)2 mask was over 20:1 for each of the additive gas proportion at which the etch rate was maximum for each plasma system.
We succeeded in high resolution force measurements by using a noncontact ultrahigh vacuum-atomic force microscope (UHV-AFM) with frequency modulation (FM) detection. We clearly observed adatoms and corner holes on the...
We succeeded in high resolution force measurements by using a noncontact ultrahigh vacuum-atomic force microscope (UHV-AFM) with frequency modulation (FM) detection. We clearly observed adatoms and corner holes on the Si(111)7×7 reconstructed surface. Then we applied the noncontact UHV-AFM with FM detection to the high resolution measurement of the electrostatic force. We preventeddeterioration of the spatial resolution of the topography by isolating the electrostatic interaction from van der Waals interaction. By simultaneous measurements of the topography and electrostatic force on a silicon oxide, a spatial resolution ∼15 Å of the electrostatic force was achieved.
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