A New Device for High-Speed Biaxial Tissue Testing: Application to Traumatic Rupture of the Aorta

2005 ◽  
Author(s):  
Matthew J. Mason ◽  
Chirag S. Shah ◽  
Muralikrishna Maddali ◽  
King H. Yang ◽  
Warren N. Hardy ◽  
...  
Keyword(s):  
High Speed ◽  
Traumatic Rupture ◽  
New Device

scholarly journals 2D-3D integration of hexagonal boron nitride and a high-κ dielectric for ultrafast graphene-based electro-absorption modulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hitesh Agarwal ◽  
Bernat Terrés ◽  
Lorenzo Orsini ◽  
Alberto Montanaro ◽  
Vito Sorianello ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hafnium Oxide ◽  
High Speed ◽  
Hexagonal Boron Nitride ◽  
Temperature Stability ◽  
Cost Effective ◽  
Fold Increase ◽  
Building Blocks ◽  
High Quality ◽  
New Device

AbstractElectro-absorption (EA) waveguide-coupled modulators are essential building blocks for on-chip optical communications. Compared to state-of-the-art silicon (Si) devices, graphene-based EA modulators promise smaller footprints, larger temperature stability, cost-effective integration and high speeds. However, combining high speed and large modulation efficiencies in a single graphene-based device has remained elusive so far. In this work, we overcome this fundamental trade-off by demonstrating the 2D-3D dielectric integration in a high-quality encapsulated graphene device. We integrated hafnium oxide (HfO2) and two-dimensional hexagonal boron nitride (hBN) within the insulating section of a double-layer (DL) graphene EA modulator. This combination of materials allows for a high-quality modulator device with high performances: a ~39 GHz bandwidth (BW) with a three-fold increase in modulation efficiency compared to previously reported high-speed modulators. This 2D-3D dielectric integration paves the way to a plethora of electronic and opto-electronic devices with enhanced performance and stability, while expanding the freedom for new device designs.

Near Side Lateral Impacts and Aortic Injury: A Parametric Study

2011 ◽  
Author(s):  
Aditya Belwadi ◽  
King H. Yang
Keyword(s):  
Head Injury ◽  
Cause Of Death ◽  
High Speed ◽  
Motor Vehicle ◽  
Flail Chest ◽  
The United States ◽  
Aortic Injury ◽  
Blunt Injury ◽  
Traumatic Rupture ◽  
Sternal Fracture

Traumatic rupture of the aorta (TRA) remains the second most common cause of death associated with motor vehicle crashes after brain injury. On an average, nearly 8,000 people die annually in the United States due to blunt injury to the aorta. It is observed that more than 80% of occupants who suffer an aortic injury die at the scene due to exsanguination into the chest cavity. TRA and blunt aortic injury (BAI) are leading causes of death in high-speed blunt impact trauma. More specific injuries that fall under these classifications include myocardial contusion (MC), traumatic aortic disruption (TAD), sternal fracture (SF), flail chest (FC) and tracheobronchial disruption (TBD) (Swan et al. 2001). Smith and Chang (1986) reported on 387 cases of blunt traumatic death in vehicular crashes and found that aortic injury was second only to head injury as the leading cause of death. Burkhart et al. (2001) reviewed 242 autopsy cases with fatal BAI and concluded that in most cases aortic injury was accompanied by head injury, rib fractures and/or hepatic trauma.

New Development in Computer Aided Electroforming for Rapid Prototyping Applications

2008 ◽  
Author(s):  
Mario Monzo´n ◽  
Pedro M. Herna´ndez ◽  
Mari´a D. Marrero ◽  
Antonio N. Beni´tez ◽  
Fernando Ortega ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
High Speed ◽  
Rotational Moulding ◽  
New Device ◽  
New Development ◽  
Metallic Shell ◽  
Edm Electrodes ◽  
Parts Manufacturing ◽  
Metallic Parts ◽  
High Level

Electroforming enables metallic parts manufacturing with good mechanical properties and high level of accuracy and reproducibility. A thin metallic shell is deposited on a model and later released from it. There are several applications of electroforming combined with rapid prototyping: injection moulds, EDM electrodes, moulds for rotational moulding, complex metallic parts, etc. However the two main disadvantages of electroforming are the non uniform thicknesses distribution and high time of shell manufacturing. The paper focuses on a new development in order to achieve uniform thickness and otherwise a faster shell manufacturing. A new device and software have been developed, named Elecform3D™. The device is an automatic machine controlled by computer and assembled into the electroforming equipment. Otherwise the software not only controls the device but also simulates and calculates the optimal positions of the cathode based in the electrolytic parameters of the bath. The software recommends an automatic program of movements or allows the operator to decide another alternatives programs if necessary. Elecform 3D is an important step beyond electroforming so far. RP 3D printer combined with Elecform 3D is a cheaper alternative for high quality metallic parts manufacturing in comparison with SLS-SLM technologies or high speed machining, mainly for rapid tooling and even rapid manufacturing.

scholarly journals A New Device for Alveolar Bone Transportation

2011 ◽  
Vol 4 (2) ◽  
pp. 91-106 ◽  
Author(s):  
Omar Vega ◽  
Daniel Pérez ◽  
Viviana Páramo ◽  
Jocelyn Falcön
Keyword(s):  
High Speed ◽  
Alveolar Bone ◽  
Bone Transport ◽  
Gingival Tissue ◽  
Facial Trauma ◽  
Orthodontic Appliances ◽  
New Device ◽  
A New Technique ◽  
Principal Author ◽  
Bone Transportation

We present a retrospective review of a new technique for the transportation of alveolar bone using a Hyrax device modified by the principal author (O.A.V.). There were seven patients (five males and two females), including five patients with cleft palate and lip diagnosis, one patient with a high-speed gunshot wound, and one patient with facial trauma sequel due to mandibular fracture. They were all treated with an alveolar bone transportation technique (ABT) through the use of the modified Hyrax device (VEGAX). Before surgery, distraction osteogenesis of the bifocal type was performed on four patients, and the trifocal type was performed on the other three patients. However, in one case, direct dental anchorage was not used, only orthodontic appliances. In all the cases, new bone formation and gingival tissue around the defect were obtained, posterior to the alveolar distraction process; no complications were observed in any patient. In one case, two teeth involved in the disk of the ABT were extracted, due to a previous condition of periodontal disease. The alveolar bone transport with the VEGAX device is an accessible technique for almost every patient with alveolar defects due to diverse causes. In all the presented cases, predictability and success were demonstrated.

scholarly journals A differential operation principle of the automatic bus transfer system pickup unit as a way of decreasing the emergency clearing time.a

2022 ◽  
Vol 1211 (1) ◽  
pp. 012009
Author(s):  
Nikolay Danilov ◽  
Sergey Tsyruk ◽  
Alexandr Timonin ◽  
Karam Sharafeddine
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Short Circuit ◽  
Open Circuit ◽  
Synchronous Motors ◽  
New Device ◽  
Study Results ◽  
Automatic Bus Transfer ◽  
Operation Algorithm ◽  
Emergency Events

Abstract A proper choice of the design and operation algorithm of emergency control devices like high-speed bus transfer (HSBT) is only possible proceeding from a study and analysis of steady-state and transient processes in emergency modes of operation (short-circuit faults, power supply disconnection, or phase open-circuit fault). The numerical experiments for studying such modes that were carried out, using the Matlab Simulink software package, on the mathematical models of an industrial power supply system involving synchronous motors connected to it made it possible to synthesize a new differential HSBT pickup unit featuring a high-speed response to emergency events. In doing so, special attention was paid to an analysis of transient operation modes with the aim of minimizing the probability of false actuations. The obtained study results have found practical application in the HSBT devices installed at the facilities of PJSC MOSENERGO. The experience gained from the operation of a new device jointly with high-speed circuit breakers produced by the Tavrida-Elektrik state-owned corporation has demonstrated essential advantages in comparison with the conventional HSBT designs.

High-Speed Biaxial Tissue Properties of the Human Cadaver Aorta

2005 ◽  
Author(s):  
Chirag S. Shah ◽  
Matthew J. Mason ◽  
King H. Yang ◽  
Warren N. Hardy ◽  
Chris A. Van Ee ◽  
...  
Keyword(s):  
High Speed ◽  
Nonlinear Behavior ◽  
Longitudinal Direction ◽  
Traumatic Rupture ◽  
Tissue Properties ◽  
Automobile Crashes ◽  
Human Cadavers ◽  
Causes Of Mortality ◽  
Constitutive Representation ◽  
Automotive Crashes

Traumatic rupture of the aorta (TRA) is one of the leading causes of mortality in automobile crashes. Finite element (FE) modeling, used in conjunction with laboratory experiments, has emerged as increasingly important tool to understand the mechanisms of TRA. Appropriate material modeling of the aorta is a key aspect of such efforts. The current study focuses on obtaining biaxial mechanical properties of aorta tissue at strain rates typically experienced during automotive crashes. Five descending thoracic aorta samples from human cadavers were harvested in a cruciate shape. The samples were subjected to equibiaxial stretch at a strain rate of 44 s−1 using a new biaxial tissue-testing device. Inertially compensated loads were measured. High-speed videography was used to track ink dots marked on the center of each sample to obtain strain. The aorta tissue exhibited anisotropic and nonlinear behavior. The tissue was stiffer in the circumferential direction with a modulus of 10.64 MPa compared to 7.94 MPa in longitudinal direction. The peak stresses along the circumferential and longitudinal directions were found to be 1.89 MPa and 1.76 MPa, respectively. The tissue behavior can be used to develop a better constitutive representation of the aorta, which can be incorporated into FE models of the aorta.

Suppression of Cavitation in Inducers by J-Grooves

2006 ◽  
Vol 129 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Young-Do Choi ◽  
Junichi Kurokawa ◽  
Hiroshi Imamura
Keyword(s):  
High Speed ◽  
Leading Edge ◽  
Design Flow ◽  
Low Flow ◽  
Axial Pressure ◽  
Flow Rates ◽  
New Device ◽  
Axial Pressure Gradient ◽  
Blade Tip ◽  
Suction Performance

Cavitation is a serious problem in the development of high-speed turbopumps, and an inducer is often used to avoid cavitation in the main impeller. Thus, the inducer often operates under the worst conditions of cavitation. If it could be possible to control and suppress cavitation in the inducer by some new device, it would also be possible to suppress cavitation occurring in all types of pumps. The purpose of our present study is to develop a new, effective method of controlling and suppressing cavitation in an inducer using shallow grooves, called “J-Grooves.” J-Grooves are installed on the casing wall near the blade tip to use the high axial pressure gradient that exists between the region just downstream of the inducer leading edge and the region immediately upstream of the inducer. The results show that the proper combination of backward-swept inducer with J-Grooves improves the suction performance of the turbopump remarkably, at both partial flow rates and the design flow rate. The rotating backflow cavitation occurring at low flow rates and the cavitation surge which occurs near the best efficiency point can be almost fully suppressed by installing J-Grooves.

Nanosecond Thermal Processing for Ultra-High-Speed Device Technology

1989 ◽  
Vol 158 ◽  
Author(s):  
Thomas W. Sigmon ◽  
Anthony M. McCarthy ◽  
CA Kurt H. Weiner ◽  
Paul G. Carey
Keyword(s):  
Thermal Processing ◽  
High Speed ◽  
Bipolar Transistors ◽  
Vertical Scaling ◽  
Process Technology ◽  
Precise Control ◽  
New Device ◽  
Device Structures ◽  
Heteroepitaxial Layers ◽  
Device Technology

ABSTRACTProgress in high-speed device technology is occurring by both scaling of conventional devices, such as MOSFETs and bipolars, and the development of new device structures which take advantage of multi-layer heterostructures. As scaling in lateral dimensions allows production of devices with dimensions approaching 0.lμm, vertical scaling has become a topic of concern. In this paper we focus on nanosecond thermal processing (NTP), anew area of process technology which uses a pulsed uv-laser to perform selective doping and epitaxy on nanosecond time scales. The rapid thermal cycles and precise control of impurity profiles inherent to the new technique addresses many of the problems faced in vertical scaling for silicon MOS and bipolar structures and in the fabrication of selective heteroepitaxial layers. Following a brief historical overview and description of the process, successful applications in the fabrication of submicron MOSFETs and narrow base bipolar transistors in silicon will be presented. Structural and electrical results will be presented for heteroepitaxial layers fabricated in the GexSi1-x and InxGa1-xAs material systems by the technique.

Design of a New Device for Household Cleaning

2012 ◽  
Vol 201-202 ◽  
pp. 711-714
Author(s):  
Wei Wang ◽  
Guo Fu Li ◽  
Jun Chen ◽  
Ji Dong Ma
Keyword(s):  
Negative Pressure ◽  
High Speed ◽  
Working Process ◽  
Cleaning Efficiency ◽  
Vacuum Cleaner ◽  
New Device ◽  
Acceleration Mechanism ◽  
Cleaning Robot ◽  
Cleaning Machine ◽  
Household Cleaning

The characteristics of traditional vacuum cleaner and automatic cleaning robot are analyzed in the paper. A new device for household cleaning is designed. The device combines leaning mechanism with suction mechanism. It could work only by pushing the cleaning machine. In its working process, the cleaning mechanism cleans larger litters first, and then the acceleration mechanism drives the impeller rotating at a high speed, and thus produces negative pressure to inhale the remaining dust. The device could improve cleaning efficiency. As the dust suction mechanism only needs to inhale dust, the force could be smaller .It will saves power and reduces the noise generated by the vacuum part at the same time.

A New Device for Increasing Output of Marine Current Energy

2013 ◽  
Vol 291-294 ◽  
pp. 1989-1992
Author(s):  
Zhi Yong Dong ◽  
Xu Zhang ◽  
Li Wang ◽  
Bin Shi
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
Area Ratio ◽  
Diameter Ratio ◽  
Stream Velocity ◽  
New Device ◽  
University Of Technology ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Current Energy

In this paper, a speeding-up inlet was developed to increase the free stream velocity in the marine current in order to increase the input energy of turbine. This study was conducted in the Hydrodynamics Laboratory at Zhejiang University of Technology. By using high-speed camera, acoustic Doppler velocimetry (ADV), the influence of area ratio and length-diameter ratio on rotational speed of the turbine was experimentally investigated. Experimental results showed that both area ratio and length-diameter ratio have significant influences on the rotational speed of marine current turbine.

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