作者：
HEKMAN, PETER M.USNIn recognition of his career-long contributions to operational engineering
technical excellence and personal leadership in the broad field of naval engineering. VAdm. Hekman began his career nearly 40 years ago as a machinist's mate in the engine room of a Navy Destroyer Escort and later attended the U.S. Naval Academy
earning a degree in Naval Engineering. He subsequently served as Engineer of five different surface combatants over an eleven year period which included ships undergoing construction and majormodernization and culminated in a four-year tour as Chief Engineer of the nuclear poweredUSSEnterprise(CVN 65). He was later the commissioning Commanding Officer of the nuclear powered cruiser USSMississippi(CGN 40). A consummate A consummate instructor in the field of naval engineering
he taught at the Navy's Nuclear Prototype in Idaho Falls where he also directed the installation and testing of the new A2W core in the Al W reactor plant. He also served as the Senior Instructor at Senior Officer Ship Maintenance and Readiness Course. As a flag officer he conducted an in-depth analysis of the content and effectiveness of all levels of engineering schooling for officers. His recommendations remain the key guide to engineering instructionto this day.A consummate instructor in the field of naval engineering he taught at the Navy's Nuclear Prototype in Idaho Falls where he also directed the installation and testing of the new A2W core in the Al W reactor plant. He also served as the Senior Instructor at Senior Officer Ship Maintenance and Readiness Course. As a flag officer he conducted an in-depth analysis of the content and effectiveness of all levels of engineering schooling for officers. His recommendations remain the key guide to engineering instruction to this day. In 1985
he reported as Deputy to the Director of Research and Development Test and Evaluation in the Office of the CNO. There he was integral to the support of over 400 development programs a number of which contributed to our Armed
作者：
SEVIK, MAURICE M.Dr. Sevik
who currently serves as the Technical Director of the Ship Acoustics Department at the David Taylor Research Center has distcnguished himself both nationally and internationally in his ability to identify innovative solutions to complex problems and to pursue thorough and comprehensive research to verify and deliver the product to the Fleet. Due to his extraordinary initiative and dedication the United States has maintained its position at the forefront of silencing technology. Dr. Sevik's recent contributions include the development of technology to significantly reduce submarine radiated noise.Dr. Sevik's vision and personal persistence resulted in the development and implementation of a self-propelled
autonomous one-fourth scale model of the Seawolf (SSN 21) which was used to evaluate numerous propulsor concepts. Dr. Sevik has also been instrumental in the design and development of two new full-scale acoustic measurement facilities and the associated next generation noise measurement arrays systems to be installed at these sites. As a recognized world authority in
and leader of the underwater acoustics community Dr. Sevik has had a profound effect on our nation's capabilities in the areas of surface ship and submarine noise reduction. Dr. Maurice M. Sevik's personal dedication
scientific leadership and personal accomplishments in the field underwater acoustics have resulted in great benefit to the naval engineering community as well as to the Navy and the Nation thereby making him most worthy to receive the 1990 American Society of Naval Engineers Gold Medal.
For ease of manufacture, axisymmetric components produced by processes such as forging, casting and moulding are often designed with a taper angle. This paper presents a family of devices for handling such components ...
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For ease of manufacture, axisymmetric components produced by processes such as forging, casting and moulding are often designed with a taper angle. This paper presents a family of devices for handling such components by their tapered portion. The devices are essentially finger tips, or jaws, to be fitted to standard scissor-type robot grippers. The jaws possess a three-dimensional profile constructed as a stack of v-shaped planar curves. The special jaw profile enables components of different diameters and taper angles to be gripped concentrically without calling for complex movements to reposition the gripper. The equations describing two categories of profile are derived and the optimum selection of profile parameters to yield compact jaws to grip components of a wide range of dimensions is discussed in the paper.
The half-space problem of rarefied gas flow (the Kramers problem) is considered for the linearized Boltzmann equation and arbitrary gas-surface interaction. Accurate numerical results for the velocity slip coefficient...
The half-space problem of rarefied gas flow (the Kramers problem) is considered for the linearized Boltzmann equation and arbitrary gas-surface interaction. Accurate numerical results for the velocity slip coefficient and velocity defect are obtained for the rigid sphere interaction and Maxwellian boundary condition.
The existence of a minimum in the cylindrical Poiseuille flow of a rarefied gas has been known since the experiments of Knudsen [Ann. Phys. 4, 75 (1909)]. Previously, the phenomenon has been studied with models of the...
The existence of a minimum in the cylindrical Poiseuille flow of a rarefied gas has been known since the experiments of Knudsen [Ann. Phys. 4, 75 (1909)]. Previously, the phenomenon has been studied with models of the Boltzmann equation, but results for the Boltzmann equation itself have not been reported. In the present paper, proceeding from recent studies, first the SN numerical algorithm for solving the linearized Boltzmann equation for the cylindircal geometry is outlined. Then, explicit numerical results for a rigid sphere gas and the boundary condition of diffuse specular reflection are obtained. The results show a minimum of the flow rate, and generally, provide a good description of the experimental data.
In this Viewpoint the author examines rising greenhouse gas emissions in the context of changes in the land uses which produce them. The clearing of forested land and associated burning of biomass account for as much ...
This paper investigates the use of local receptive field networks (LRFN) in detecting sensor failures of a control system in the presence of model-plant mismatch. Simulation results indicate that LRFNs hold significan...
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This paper investigates the use of local receptive field networks (LRFN) in detecting sensor failures of a control system in the presence of model-plant mismatch. Simulation results indicate that LRFNs hold significant promise in sensor failure detection. Another issue discussed in this paper is a method to prune redundant nodes. A simple scheme which uses singular value decomposition (SVD) is developed to identify and remove excess nodes. Comparable classification performance is obtained using reduced and standard LRFN.
Batch processes are usually complex and highly nonlinear systems. Modeling error can be the cause of bad performance when optimal input profiles computed for a particular model are applied to the actual plant. The app...
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Batch processes are usually complex and highly nonlinear systems. Modeling error can be the cause of bad performance when optimal input profiles computed for a particular model are applied to the actual plant. The approach followed in this paper uses the available model and actual plant measurements to modify the operation of the next batch, without requiring the remodeling the process. The effect of model error on the convergence of the iterative batch to batch input profile determination is investigated. The method is applied through computer simulations to the determination of the optimal feedrate profile for a cell mass production process. A model parameter update scheme is also proposed, based on the convergence analysis. This is applied to the determination of the optimal temperature profile of bulk polymerization of the optimal temperature profile of styrene.
Linear Muffin Tin Orbital and Linearly Augmented Plane Wave calculations of equations of state were performed for observed and hypothetical ordered structures in the NiAl-NiTi system. Total energies were parameterized...
Linear Muffin Tin Orbital and Linearly Augmented Plane Wave calculations of equations of state were performed for observed and hypothetical ordered structures in the NiAl-NiTi system. Total energies were parameterized in both the Connolly-Williams and fk-G approximations, and the resulting parameters were used to calculate theoretical phase diagrams by the cluster variation method. Third nearest neighbor Al—Ti pairwise interactions are predicted to be strongly repulsive, and to be a major cause of observed B2+L21 two phase fields.
Automation technology, including digital computer and communication techniques, is being applied in an ever-increasing range of private and public spheres, also reaching third-world cultures not previously exposed to ...
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Automation technology, including digital computer and communication techniques, is being applied in an ever-increasing range of private and public spheres, also reaching third-world cultures not previously exposed to such technology. This invokes the engineer's responsibility to consider the direct and indirect effects caused by this technology. The question is when and how to include these factors in the design and implementation process, prospectively avoiding bad effects and still fulfilling the goals imposed on the engineer by his client. To be able to carry that responsibility and make proper design decisions, the engineer must both understand 'appropriateness' within a given boundary, and have decision authority together with other parties participating in the design. Whereas sound methodologies for user-centred design are appearing, anticipating and considering the cultural effects of automation is an area going far beyond engineering. Nevertheless, engineers should get more deeply involved in comprehensive technology assessment. Encouraging experiences show how novel design approaches and consideration of comprehensive sets of requirements can lead to better overall system performance, but much research on open questions remains to be done.
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