The Regenerative Digital Transducer (RDT): A New Active Microwave Field Sensor for Industrial Measurements and Control

1974 ◽  
Author(s):  
R. G. Bosisio ◽  
L. Nappert ◽  
H. Hua Quoc
Keyword(s):  
Microwave Field ◽  
Field Sensor ◽  
Digital Transducer ◽  
And Control

scholarly journals Граничное значение поля, разделяющее области подкритических и глубоко подкритических видов СВЧ-разряда, зажигаемого на диэлектрической поверхности

2019 ◽  
Vol 89 (1) ◽  
pp. 64
Author(s):  
П.В. Булат ◽  
Л.П. Грачев ◽  
И.И. Есаков ◽  
А.А. Раваев
Keyword(s):  
Microwave Field ◽  
Microwave Discharge ◽  
Threshold Level ◽  
Propagation Direction ◽  
Plasma Region ◽  
Dielectric Tube ◽  
Microwave Beam ◽  
Inner Surface ◽  
And Control ◽  
Microwave Discharges

AbstractMicrowave discharges initiated by an electromagnetic (EM) vibrator and ignited on the inner surface of a dielectric tube in a quasi-optical EM beam are experimentally studied. A threshold level of the microwave field that separates domains of subcritical and deeply subcritical microwave discharges is determined in experiments. Experiments show that streamer channels of the subcritical discharge propagate from the initiator along the propagation direction of the EM wave and in the opposite direction under certain conditions. Variations in the power of the microwave beam can be used to change length of the plasma region of the subcritical discharge along the wave vector of the microwave beam and control the level of the EM energy absorbed in the plasma regions of the deeply subcritical microwave discharge.

An Efficient Fitness Function for Clustering of Wireless Sensor Networks

2020 ◽  
Vol 10 (3) ◽  
pp. 318-324
Author(s):  
Atiieh Hoseinpour ◽  
Mojtaba Jafari Lahijani ◽  
Mohammad Hosseinpour ◽  
Javad Kazemitabar
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Fitness Function ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Evolutionary Clustering ◽  
Fitness Functions ◽  
Field Sensor ◽  
Simulation Results ◽  
And Control

Background & Objective: A sensor network is composed of a large number of sensor nodes that are deployed to perform measurement and/or command and control in a field. Sensor nodes are battery powered devices and replacement or recharging of their batteries may not be feasible. One of the major challenges with sensory wireless networks is excessive energy consumption in nodes. Clustering is one of the methods that has been offered for resolving this issue. In this paper, we pursue evolutionary clustering and propose a new fitness function that har-nesses multiple propagation indices. Methods: In this paper we develop an efficient fitness function by first selecting the best clusters, and then selecting the best attribution of cluster to clusters. The distance between the nodes and relevant cluster heads was used for the mathematical modelling necessary. In the end we develop the fitness function equation by using normalization of the raw data. Results: Simulation results show improvement compared to previous fitness functions in clustering of the wireless sensor networks.

scholarly journals Magnetic Elastomer Sensor for Dynamic Torque and Speed Measurements

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 309
Author(s):  
Valentin Mateev ◽  
Iliana Marinova
Keyword(s):  
Sensor Design ◽  
Position Sensor ◽  
Test Results ◽  
Rotating Shaft ◽  
Mechatronic Systems ◽  
Wide Range ◽  
Field Sensor ◽  
And Control ◽  
Elastomer Coating ◽  
Linear Field

In this paper is proposed a dynamic torque, rotational speed, and shaft position sensor. It is built of magnetic elastomer coating directly applied over a rotating shaft. The sensor is used for precise measurements of changes in torque and speed, and it is usable at high rotational speeds, directly on the device shaft. The sensor is based on magnetic elastomer material deformation and the corresponding change in magnetic field amplitude and direction. The proposed sensor design is simple and can acquire reliable readings for a wide range of rotational speeds. Sensor design consists of the following: magnetic elastomer coating with nanoparticles, in which, elastomer is used for a sensing convertor; magneto-resistive linear field sensor; and microprocessor unit for calibration and control. Numerical and experimental test results are demonstrated and analyzed. Sensor implementation aims to meet magnetic mechatronic systems’ specific requirements.

Energy Efficient Clustering for Wireless Sensor Network Using Hybrid Genetic - Bees Algorithm

2019 ◽  
Vol 9 (2) ◽  
pp. 253-259
Author(s):  
Atiieh Hoseinpour ◽  
Mojtaba Jafari Lahijani ◽  
Javad Kazemitabar
Keyword(s):  
Energy Consumption ◽  
Sensor Network ◽  
Fitness Function ◽  
Optimal Solution ◽  
Sensor Nodes ◽  
Bees Algorithm ◽  
Multiple Points ◽  
Field Sensor ◽  
Energy Efficient Clustering ◽  
And Control

Background & Objective: A sensor network is composed of a large number of sensor nodes that are deployed to perform measurement and/or command and control in a field. Sensor nodes are battery powered devices and replacement or recharging of their batteries may not be feasible. One of the major challenges with sensory wireless networks is excessive energy consumption in nodes. Methods: Clustering is one of the methods that have been offered for resolving this issue. Clustering provides a means to reduce the number of wireless communications that greatly increase the life expectancy of the network. In this paper, we propose a novel hybrid genetic-bees algorithm that harnesses an efficient fitness function. This hybrid algorithm can smartly divide the sensor nodes into clusters and thus reduce the energy consumption. Results and Conclusion: The simulation results show that this algorithm can simultaneously process multiple points in the search grid and also converge to the optimal solution in reasonable time.

A Survey of Digital Transducer Instruments Used in the Weighing Industry - Part 2

1980 ◽  
Vol 13 (8) ◽  
pp. 275-277
Author(s):  
Al Brendel
Keyword(s):  
Maximum Error ◽  
Scale Division ◽  
Digital Transducer ◽  
The Uk ◽  
And Control ◽  
Measurement And Control ◽  
Better Than

It should be remembered that the information in these two articles surveying digital transducer instruments was written for the American market, but has been included in Measurement and Control to show what is available outside the UK. In fact some are also available here. The number of active digits is not necessarily an indication of the accuracy but of overall sensitivity of the instruments. If one is trying to compare these with European instruments, particularly to those approved to OIML or the BOT standards, the number of digits in these cases is restricted by the maximum error of the instrument. That is to say that if the instrument is being approved for 1 part in 3000 the error should not exceed 1 scale division. This can hardly apply to some of the instruments that are listed in Al Brendel's chart which show performances of 1 part in 40 000. The UK authorities would not normally expect to approve equipment better than 1 part in 5000, the norm being more like 1 part in 3500.

scholarly journals Coherent excitation and control of Rydberg lithium atoms in a chirped microwave field

2013 ◽  
Vol 62 (1) ◽  
pp. 013101
Author(s):  
Jiang Li-Juan ◽  
Zhang Xian-Zhou ◽  
Jia Guang-Rui ◽  
Zhang Yong-Hui ◽  
Xia Li-Hua
Keyword(s):  
Microwave Field ◽  
Coherent Excitation ◽  
And Control

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Evidence for a Blood Ganglion Barrier in the Superior Cervical Ganglion of the Rat

1982 ◽  
Vol 40 ◽  
pp. 204-204
Author(s):  
D. M. DePace
Keyword(s):  
Blood Vessels ◽  
Superior Cervical Ganglion ◽  
Peripheral Nerves ◽  
Time Schedule ◽  
Transmission Electron ◽  
Cervical Ganglion ◽  
The Central Nervous System ◽  
Cervical Ganglia ◽  
Capillary Circulation ◽  
And Control

The majority of blood vessels in the superior cervical ganglion possess a continuous endothelium with tight junctions. These same features have been associated with the blood brain barrier of the central nervous system and peripheral nerves. These vessels may perform a barrier function between the capillary circulation and the superior cervical ganglion. The permeability of the blood vessels in the superior cervical ganglion of the rat was tested by intravenous injection of horseradish peroxidase (HRP). Three experimental groups of four animals each were given intravenous HRP (Sigma Type II) in a dosage of.08 to.15 mg/gm body weight in.5 ml of.85% saline. The animals were sacrificed at five, ten or 15 minutes following administration of the tracer. Superior cervical ganglia were quickly removed and fixed by immersion in 2.5% glutaraldehyde in Sorenson's.1M phosphate buffer, pH 7.4. Three control animals received,5ml of saline without HRP. These were sacrificed on the same time schedule. Tissues from experimental and control animals were reacted for peroxidase activity and then processed for routine transmission electron microscopy.

Effects of renovascular hypertension on rat adrenal zona glomerulosa

1978 ◽  
Vol 36 (2) ◽  
pp. 582-583
Author(s):  
G. Mazzocchi ◽  
P. Rebuffat ◽  
C. Robba ◽  
P. Vassanelli ◽  
G. G. Nussdorfer
Keyword(s):  
Renovascular Hypertension ◽  
Left Kidney ◽  
Renin Angiotensin System ◽  
Plasma Renin ◽  
Zona Glomerulosa ◽  
Ultrastructural Changes ◽  
Albino Rats ◽  
Left Renal Artery ◽  
Angiotensin System ◽  
And Control

It is well known that the rat adrenal zona glomerulosa steroidogenic activity is controlled by the renin-angiotensin system. The ultrastructural changes in the rat zona glomerulosa cells induced by renovascular hypertension were described previously, but as far as we are aware no correlated biochemical and morphometric investigations were performed.Twenty adult male albino rats were divided into 2 experimental groups. One group was subjected to restriction of blood flow to the left kidney by the application of a silver clip about the left renal artery. The other group was sham-operated and served as a control. Renovascular hypertension developed in about 10 days: sistolic blood pressure averaged 165 ± 6. 4 mmHg, whereas it was about 110 ± 3. 8 mmHg in the control animals. The hypertensive and control rats were sacrificed 20 days after the operation. The blood was collected and plasma renin activity was determined by radioimmunological methods. The aldosterone concentration was radioimmunologically assayed both in the plasma and in the homogenate of the left capsular adrenal gland.

Sign in / Sign up

Export Citation Format

Share Document