On the noise transmission and control for a cylindrical chamber core composite structure

2005 ◽  
Vol 288 (1-2) ◽  
pp. 235-254 ◽  
Author(s):  
Deyu Li ◽  
Jeffrey S. Vipperman
Keyword(s):  
Composite Structure ◽  
Cylindrical Chamber ◽  
Noise Transmission ◽  
And Control

A Design Based Materials Study for a Wearable Muscle Stretching Device Aimed at Patients With Spasticity

2007 ◽  
Author(s):  
Michael Bailey-Van Kuren ◽  
Carter Hamilton ◽  
Eduardo Rivera
Keyword(s):  
Composite Structure ◽  
Treatment Options ◽  
Current Treatment ◽  
Sensor System ◽  
Wearable Sensor ◽  
Thin Film Sensors ◽  
Muscle Stretching ◽  
Serial Casting ◽  
Muscle Groups ◽  
And Control

The efficacy of robotic systems in rehabilitation is well established. Many of these systems are fixed equipment that requires the user to visit a facility for treatment. Furthermore, current treatment options for pediatric patients with spastic dyplagia include manual stretching of the muscle groups and serial casting in conjunction with Botox injections. The goal of this work is to develop a dynamic orthotic to stretch the muscles of the lower calf. A subsystem of this project is the development of wearable sensor system to detect spasticity and control the system actuators. A system of thin film sensors embedded into a novel composite structure is proposed. In order to develop a dynamic orthotic to stretch the muscles of the lower calf, a subsystem of this project is the development of wearable sensor system embedded into a novel composite structure [1, 2, 3].

Vibro-acoustic modelling in aircraft cabin noise transmission and control

1997 ◽  
Author(s):  
A. Grewal ◽  
D. Zimcik ◽  
R. Lapointe ◽  
A. Grewal ◽  
D. Zimcik ◽  
...  
Keyword(s):  
Aircraft Cabin ◽  
Cabin Noise ◽  
Acoustic Modelling ◽  
Noise Transmission ◽  
And Control

Controllable Bistable Smart Composite Structures Driven by Liquid Crystal Elastomer

2021 ◽  
Author(s):  
Jingtian Kang ◽  
Suixin Liu ◽  
Changguo Wang
Keyword(s):  
Liquid Crystal ◽  
Composite Structure ◽  
Composite Structures ◽  
Cylinder Surface ◽  
Liquid Crystal Elastomer ◽  
Smart Composite Structures ◽  
Quantitative Understanding ◽  
Two Parameters ◽  
And Control ◽  
Actuation Strain

Abstract In this article, we proposed a new way to achieve monostable and bistable characteristics of composite layers based on liquid crystal elastomer (LCE). A smart trilayer composite structure is fabricated using LCE and acrylic elastomer, which can have several morphologies. It keeps flat at room temperature and can deform into a monostable saddle or bistable cylinder surface in response to simple temperature changes. The reversible deformation can be controlled through two parameters including geometrical size and actuation strain. The LCE can be programmed to generate different actuation strains by different formulas during synthesis or different mechanical stretches during UV radiation. The deformed morphology for different sample sizes and actuation strain is calculated using Finite element simulation. By comparison with the experimental results, we confirm that the phenomena can be captured through numerical simulations. Furthermore, to have a quantitative understanding, we use numerical simulation to calculate the deformation of the composite structure by tuning these two parameters and give a morphological portrait illustrating the relationship between the deformed shape and control parameters.

Noise Transmission and Control for a Light Twin-Engine Aircraft

1981 ◽  
Vol 18 (7) ◽  
pp. 570-575 ◽  
Author(s):  
C.K. Barton ◽  
J.S. Mixson
Keyword(s):  
Noise Transmission ◽  
And Control

Research on Chaotic Characteristic for Settlement of Road-Tunnel Composite Structure

2011 ◽  
Vol 243-249 ◽  
pp. 2893-2898
Author(s):  
Zhen Liu ◽  
Cui Ying Zhou
Keyword(s):  
Composite Structure ◽  
Chaotic Dynamics ◽  
Maximum Lyapunov Exponent ◽  
Road Tunnel ◽  
Engineering Project ◽  
The Road ◽  
Prediction And Control ◽  
Chaotic Characteristic ◽  
And Control ◽  
Settlement Time

According to settlement of road-tunnel composite structure, relying on the Connecting Engineering Project at Shenzhen of Shenzhen-Hong Kong Western Corridor Project, settlement time series is analyzed by chaotic dynamics. Combining with phase space reconstruction, the correlation dimension, the maximum Lyapunov exponent, entropy and complexity of the road-tunnel composite structure system is studied. The results show that the settlement development of road-tunnel composite structure is still stable and predictable completely, of which chaotic characteristic is not obvious. This research has a great significance for the settlement prediction and control of the similar projects.

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.

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