Under one-sun illumination, the highest energy conversion efficiencies of silicon solar cells are presently obtained with bifacially contacted n/sup +/p cells, where contact to the p-type substrate is made via small o...
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Under one-sun illumination, the highest energy conversion efficiencies of silicon solar cells are presently obtained with bifacially contacted n/sup +/p cells, where contact to the p-type substrate is made via small openings in the rear passivating oxide. Experimentally, it has been found that the dark and illuminated current-voltage (I-V) characteristics of these devices deviate strongly from ideal diode theory. In this work the experimental I-V curves are compared with results obtained from 2- and 3-dimensional (2D, 3D) device simulation based on experimental cell parameters. Excellent agreement between theory and experiment is obtained. The paper shows why these solar cells cannot accurately be modelled by 1D simulators and reveals the physical reasons underlying the observed non-idealities.< >
An expert system for aiding material selection process is proposed which, in conjunction with TOPSIS (Technique for Order Preference by Similarity to Ideal Situation), provides a very effective and efficient technique...
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An expert system for aiding material selection process is proposed which, in conjunction with TOPSIS (Technique for Order Preference by Similarity to Ideal Situation), provides a very effective and efficient technique for material selection for a component. TOPSIS is a highly advanced optimization technique which requires that the user provides an index of relative importance for different properties by the author, the relative importance rating to be decided by the designers. However, the designers may not arrive at the same conclusion due to their different rating technique even though they use the same technique. In the proposed method, an expert system has been presented, which uses a small tool called Rulemaster and OPSS (developed at IIT Delhi) that facilitates the development of particular consultant paradigms. In identifying the knowledge base to be included in the system, special care was taken so that different designers get uniform results by using the proposed system.< >
作者:
VINROOT, CAORNER, JGUSNCapt. Charles A. Vinroot
USN (Ret.)retired from the U.S. Navy in September 1991 following over 27 years of active duty as an engineering duty officer. He holds a BSEE from North Carolina State University and a MSEE and professional degree from the U.S. Naval Postgraduate School. During his naval career he served on USSIndependence (CVA-62) and USSLuce (DLC-7/DDC-38). He also served at Supship Quincy Mass. and Hunters Point Naval Shipyard. He was stationed in Washington D.C. with assignments at CNO (OP 98) ASN (S&L) and the Naval Sea Systems Command. Captain Vinroot was technical director of the Battleship Reactivation Program (PMS 378) technical director of the Destroyer Acquisition Program (PMS 389) and deputy program manager of the Amphibious Warfare and Strategic Sealift Program (PMS 377). Most recently he served as program manager for Gas Turbine Surface Combatants (PMS 314) and Surface Combatants (PMS 330). Captain Vinroot is now employed by PRC Inc. and serves as technical director for the Advanced Technology Division in Crystal City Va. Jeffery G. Ornergraduated from Wittenberg University in Springfield
Ohio in 1979 with a bachelor of arts degree in political science and earned a master's of science degree in business from The American University in Washington D.C. in 1982. He has ten years of professional experience with the Naval Sea Systems Command in positions with responsibilities for logistic support planning policy and delivery computer-aided acquisition and logistic support and Fleet Modernization Program (FMP) and ship construction issues. He was a key player in establishing the current FMP integrated logistic support (ILS) process and in implementing of the Ships' Configuration and Logistic Support Information System (SCLSIS). His current position as Fleet Logistic Support Branch head for the Surface Combatant Program includes responsibility for logistic support and management of ship configuration and logistic data for all surface combatant ships (except for Aegis ships). In
USS Ingraham (FFG-61) is the prototype ship for NavSea's Advanced Technical Information system (ATIS). ATIS is a digital technical library, which holds on optical disks the ship's 2,000 technical manuals and 7...
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USS Ingraham (FFG-61) is the prototype ship for NavSea's Advanced Technical Information system (ATIS). ATIS is a digital technical library, which holds on optical disks the ship's 2,000 technical manuals and 73,000 drawing sheets. It contains a detailed ship's configuration index (derived from SCLSIS) to lead the user to the proper drawing or manual, and it replaces the ship's aperture cards and the second (library) copy of the technical manuals. ATIS, and the data standards established and tested through ATIS development, will be the technical library portion of micro-SNAP and SNAP III. It also forms an important part of NavSea's plans to utilize EDMICS data. This paper describes the goals and technical concepts behind the development of ATIS. Problems encountered, solutions developed, and lessons learned are detailed. Special attention was paid to the application of the computer Aided Acquisition and Logistic Support (CALS) standards, problems caused by conflicts and ambiguities in those standards, the standards. Original program goals are compared with actual operational experiences. Plans for future expansion are outlined, including applications of this technology in the availability planning and execution process. A comparison is developed among the various methods of optical imaging and their costs and benefits.
A multilingual Input/Output (I/O) system has been designed based on typological studies of writing conventions of major world languages. Designed as a layered structure, it unifies common features of writing conventio...
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We develop a multi-dimensional approach to approximate reasoning. A multi-dimensional array, called a transition matrix, is defined which stores the joint probabilities of the occurrences of a set of n variables takin...
The authors develop a multidimensional approach to approximate reasoning. A multidimensional array, called a transition matrix, is defined which stores the joint probabilities of the occurrences of a set of n variable...
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The authors develop a multidimensional approach to approximate reasoning. A multidimensional array, called a transition matrix, is defined which stores the joint probabilities of the occurrences of a set of n variables taking their values in different sets. Using the transition matrix it is possible to compute the information regarding the probability of occurrences of the variables as certain matrix products.< >
A finger-shaped tactile sensor consisting of a charge-coupled device (CCD) and a semispherical optical waveguide covered with an elastic sheet and connected to a light source is proposed. The principle of the sensor i...
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A finger-shaped tactile sensor consisting of a charge-coupled device (CCD) and a semispherical optical waveguide covered with an elastic sheet and connected to a light source is proposed. The principle of the sensor is based on producing the scattering light at the sensor-object contact. The contact location is recognized using a CCD to detect light. By a simple calculation of the equation derived from the sensor surface geometry, the sensor can also provide the surface normal of the touched object. Through experiments using a prototype sensor, the fundamental characteristics of the sensor are evaluated and the principle of the sensor is confirmed.< >
A combined frequency and time domain design technique is described for a class of multivariable feedback systems containing a set of coupled nonlinear elements of any general multivalued form. The parameter of the com...
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A combined frequency and time domain design technique is described for a class of multivariable feedback systems containing a set of coupled nonlinear elements of any general multivalued form. The parameter of the compensator is initially derived from the frequency domain analysis and automatically adjusted by the numerical synthesis routine in order to meet specified time domain performance. The method employs a combined analytical and synthesis procedures and provides a powerful tool in the design of a wide class of nonlinear multivariable feedback systems. Example is presented to demonstrate the efficiency of the proposed design technique.
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