Multiple Inertial System Operation In Long Term Navigation

1962 ◽  
pp. 349-366
Keyword(s):  
Inertial System ◽  
System Operation

MULTIPLE INERTIAL SYSTEM OPERATION IN LONG TERM NAVIGATION

1962 ◽  
pp. 349-366
Author(s):  
Richard R. Palmer ◽  
Donald F. McAllister
Keyword(s):  
Inertial System ◽  
System Operation

Derivation of Monthly Operating Rules for Cascade Hydropower Stations Based on SVM

2013 ◽  
Vol 838-841 ◽  
pp. 1673-1676
Author(s):  
Ting Zhou ◽  
Chang Ming Ji ◽  
Bi Kui Zhao
Keyword(s):  
River System ◽  
Optimization Method ◽  
Optimal Operation ◽  
Support Vector ◽  
System Operation ◽  
Optimal Operating ◽  
Operating Rules ◽  
Hydropower Stations ◽  
System Power

In order to promote the efficiency of actual hydropower system operation under limited inflow forecast, an Implicit Stochastic Optimization method using Support Vector Machine (SVM) theory is proposed in this paper to derive long-term optimal operating rules. By applying the model to the Jinsha-Yangtze river system which is the largest hydropower base in China, fitting performance of operating rules is explained and evaluated. System simulation results are given and compared to deterministic optimal operation. Power output processes comparison shows that the average annual system power generation in two scenarios are 395TWh and 392TWh, and the overall operation processes are in well accordance with explicable inconsistency, which proves the efficiency of SVM in operating rules derivation for hydropower stations.

Demonstration of SiC Vertical Trench JFET Reliability

2012 ◽  
Vol 717-720 ◽  
pp. 1017-1020 ◽  
Author(s):  
Kevin M. Speer ◽  
Kiran Chatty ◽  
Volodymyr Bondarenko ◽  
David C. Sheridan ◽  
Kevin Matocha ◽  
...  
Keyword(s):  
High Temperature ◽  
Circuit Design ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Measured Parameter ◽  
System Operation ◽  
Dislocation Glide ◽  
Temperature Bias ◽  
Bias Stress

This paper demonstrates the reliability of SiC vertical trench junction field-effect transistors (VJFET). Measurements are shown which prove that the device’s intrinsic gate-source pn junction is immune to degradation associated with recombination-enhanced dislocation glide. And after subjecting VJFETs to 1,000 hours of high-temperature bias stress, no measured parameter deviated from datasheet specifications. These results reflect the maturity and reliability of SemiSouth’s SiC VJFET technology, as well as tight process control over device parameters that are critical to circuit design and long-term system operation.

An automatic syringe for coronary occlusion in long-term collateralization studies

1989 ◽  
Vol 256 (6) ◽  
pp. H1707-H1710 ◽  
Author(s):  
W. M. Caldwell ◽  
D. P. McKown ◽  
J. A. Bleck ◽  
J. W. Hartley ◽  
T. Erdal ◽  
...  
Keyword(s):  
Coronary Artery ◽  
Coronary Occlusion ◽  
Pressure Relief Valve ◽  
System Operation ◽  
Relief Valve ◽  
Pressure Relief ◽  
Battery Charge ◽  
Portable Apparatus ◽  
Fail Safe

A portable apparatus for performing repeated, brief coronary artery occlusions automatically in long-term chronic studies involving dogs and larger animals is described. The battery-operated, back-pack-carried device uses a motorized syringe driven by a digital-programmable timing circuit to inflate a coronary artery occluder for durations of 10 s to 3 min at intervals from 14 s to 16 h. A single battery charge produces 450 occlusions. The generated pressure is adjustable to 1,000 mmHg maximum. A separate fail-safe circuit monitors system operation to open a pressure-relief valve if occlusions exceed a preset duration.

An Alternative to Full Inertial Systems

1964 ◽  
Vol 17 (3) ◽  
pp. 250-261
Author(s):  
J. D. Stevenson ◽  
D. L. Wright
Keyword(s):  
Reference System ◽  
Doppler Radar ◽  
Correct Choice ◽  
Inertial System ◽  
Reference Systems ◽  
Short Term ◽  
Velocity Sensor ◽  
Inertial Systems

It is not the purpose of this paper to enter too deeply into the controversy between heading reference systems (combined with a velocity sensor) and full inertial systems. Rather it is intended to indicate what may be achieved at the present time, and in the next few years, using a heading reference system combined with a velocity sensor such as doppler radar. In conclusion the performance, weight, size, cost and reliability of such systems will be compared with similar figures for a full inertial system in the hope of stimulating thought and discussion as to what is the correct choice of system as well as to what the user may be able to afford.In the early part of the last decade the most widely used heading reference was the gyro-magnetic compass—a flux-valve being used to give good long-term heading accuracy whilst short-term variations are smoothed out by the integrating action of a' directional gyroscope. The directional gyroscope was in fact slaved to the magnetic reference. Accuracies of 1°·0 (r.m.s.) are typically achieved by such a system, although higher accuracies are sometimes claimed under certain specified conditions.

Numerical simulations of evaluating dynamic interactions between groundwater and river water in GWHP operated riverside area

2020 ◽  
Author(s):  
Hyun Jung Kim ◽  
Eun-Hee Koh ◽  
Byeong-Hak Park ◽  
Kang-Kun Lee
Keyword(s):  
River Water ◽  
Transport Model ◽  
System Operation ◽  
Groundwater Temperature ◽  
Dynamic Interactions ◽  
Temperature Changes ◽  
Stable Temperature ◽  
Groundwater Heat Pump ◽  
Background Temperature

<p>The riverside area is suitable for operating the Groundwater Heat Pump (GWHP) system because it has abundant groundwater. In riverside area, inflow of river water can occur due to the hydraulic gradient between the river water and the groundwater. The mixing of the two waters can cause changes of groundwater temperature. Because GWHP systems use a stable temperature of groundwater as the heat source, groundwater temperature changes can affect operational efficiency. Therefore, in order to operate the GWHP system in the riverside region, it is important to understand how the mixing of river water and groundwater affects the groundwater background temperature. In addition, the temperature of groundwater re-injected into the aquifer after heat exchange in the GWHP system can also affect the background groundwater temperature. In this study, 3D groundwater flow and heat transport modeling was conducted based on groundwater and river water level and temperature monitoring data in order to investigate the mixing of river water and groundwater. Solute transport model was used to calculate the mixing ratio of river water and groundwater to determine whether it affects GWHP system. The model was also used to predict the effects of long-term GWHP system operation in the study area for more than 30 years. The model results predicted the sustainability of the GWHP system by understanding changes in groundwater temperature distribution in the study area.</p>

scholarly journals Modeling Simulation and Maintenance Strategy Optimization of Multi-component System

2021 ◽  
Vol 2068 (1) ◽  
pp. 012032
Author(s):  
Yujun Ma ◽  
Yan Zhou
Keyword(s):  
System Reliability ◽  
Dynamic Environment ◽  
Working Environment ◽  
Simulation Algorithm ◽  
System Operation ◽  
Maintenance Strategies ◽  
Modeling Simulation ◽  
Actual Operation ◽  
Multi Component System

Abstract As the system tends to be complicated and refined, the probability and cost of failure also increase. In the actual operation and production, the system will be affected by various factors such as temperature, humidity and other factors to change their original working environment, which will have greater impact on the reliability of the system. Based on the reliability theory, this paper mainly studies the k-out-of-n: F system, constructs the reliability model of the system in dynamic environment, gives the simulation algorithm of the system reliability. Finally, this paper puts forward two maintenance strategies which are optimized to achieve the purpose of minimizing the long-term average cost during system operation.

Therapy and prevention for mental health: What if mental diseases are mostly not brain disorders?

2019 ◽  
Vol 42 ◽  
Author(s):  
John P. A. Ioannidis
Keyword(s):  
Mental Health ◽  
Mental Disease ◽  
Brain Disorders ◽  
Social Stressors ◽  
Labor Education ◽  
Mental Diseases ◽  
Long Term Follow Up ◽  
Political Decisions

AbstractNeurobiology-based interventions for mental diseases and searches for useful biomarkers of treatment response have largely failed. Clinical trials should assess interventions related to environmental and social stressors, with long-term follow-up; social rather than biological endpoints; personalized outcomes; and suitable cluster, adaptive, and n-of-1 designs. Labor, education, financial, and other social/political decisions should be evaluated for their impacts on mental disease.

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