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A great deal of scientific research in recent years has focused on alternative neutron detection technologies to the more commonly used 3He proportional counter. One such example is a novel thermal neutron detector developed by Los Alamos National Laboratory consisting of multiple thin film10B layers combined with a double helix electrode configuration. The detector promises low manufacturing costs...
With the implementation of the thermal flying height control (TFC) slider, the flying height is reduced to approximately 2 nanometers [1], the gaseous rarefaction effects, surface roughness and surface accommodation effects must be taken into account. The surface accommodation coefficient (AC) is an important factor to govern the flying characteristics of the air bearing slider [2-3]. Effects of gaseous...
Spindles, key components of a spinning frame, are also the symbol of textile industry. Its dynamic performance directly affects the quality and yield of yarn [1]. At present, the spindle, up to 25000 rpm, belongs to high speed of rotors. In the process of work, it has to face the vibration problem, which is the main reason that spindle cannot speed up and broken yarn.
When high voltage direct current (HVDC) system is under the monopolar operation mode, huge direct current (DC) is injected into the earth through the DC grounding electrode, which will result in earth potential changes in a wide range of area. In this case, DC will be coupled into the nearby alternating current (AC) power grid and have some bad influences, called DC bias phenomenon, on the measuring...
Current-induced spin-transfer torque (STT) is a mainstream method of switching the magnetization of free layer of magnetic tunnel junctions (MTJs) [1-2]. However, currently STT-MTJ is suffering from speed and energy bottlenecks caused by two tradeoffs: firstly, since the critical write current (Ic0) is proportional to the thermal stability barrier (Δ), it is difficult to reduce Ic0 without decreasing...
One way to excite a dark envelope soliton is to use a dark input pulse — a narrow dip in the amplitude of a continuous wave background. This approach has been used previously to excite dark solitons for surface spin waves in yttrium iron garnet (YIG) thin film strips1 and for lasers in photorefractive crystals.2 Theoretically, however, an initial dark signal should not evolve into a single dark soliton,...
A simple eigenvalue representation result that justifies the celebrated phase compensation principle, from algebraic point of view, is presented. The result generalizes phase compensation principle, it appears as a stability criterion, applicable to multi-machine systems. It allows us to find compensation angle for machines individually. Furthermore, the problem of gain coordination is also reduced...
This paper studies the volt/var control strategy for smart distribution system by formulating and solving system optimization problems. In the study, solid state transformers (SST) are used for continuous var compensation, while voltage regulators (VR) are for voltage regulation. The objectives are to minimize total system power loss while maintaining voltages along the feeder within acceptable limits...
A supervisory strategy is proposed for improving the performance of an evolutionary-algorithm-based system-maintenance optimizer developed in our previous work for offshore power systems. The system-maintenance optimizer generates a set of initial maintenance plans, and exports them to an intelligent maintenance advisor connected to it for implementation. The proposed supervisory strategy uses a set...
This paper presents the modeling and simulation work completed in the project sponsored by ONR grant N00014-08-C-0227. The project is to investigate new design concepts of all-electric ship integrated power systems (IPS) and to develop PEBB-based converter models that will represent the existing commercially available products with adequate details and interfaces to allow them to be used in various...
Traditional sales and operations planning (S&OP) focus on balancing between supply and demand in a company. It is utilized to ensure the alignment of plans supporting the business strategic goal. An obvious drawback of past decision models is lacking in considering financial planning. The paper proposes a new global S&OP planning model integrating financial flows and physical flows in a company...
Reactive power plays a crucial role in power system operation and voltage management. However reactive power issues have rarely been considered in reliability evaluation of power systems. This paper investigates the effect of reactive power on reliability of the 220 kV Taiyuan Power System in Shanxi Province of China. Reactive power shortage and the associated voltage violations due to the failures...
In semiconductor manufacturing processes, mixed-products are usually fabricated on the same set of process tool with different recipes. Run-to-run controllers which based on the exponential weighted moving average (EWMA) statistic are probably the most frequently used in industry for the quality control of certain semiconductor manufacturing process steps. However, for mixed-product drifting process,...
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