MR Fluid Sponge Materials and Devices

2000 ◽  
Author(s):  
J. David Carlson ◽  
Michael J. Chrzan
Keyword(s):  
High Performance ◽  
Low Cost ◽  
High Strength ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Control Authority ◽  
Degree Of Control ◽  
New Generation ◽  
High Degree ◽  
Cost Components

Abstract Stable, high-strength, magnetorheological (MR) fluids and devices such as rotary brakes and linear vibration dampers that enable the benefits of controllable fluid technology are now commercially available. Recently, a new way of using MR fluids in which the fluid is contained in an absorbent matrix has been developed. Such MR fluid sponge devices enable the benefits of controllable MR fluids to be realized in cost sensitive applications. Most of the high-cost components normally associated with a fluid filled device can be eliminated with this approach. Low-cost, controllable MR fluid sponge dampers are particularly appropriate for moderate-force vibration control problems where a high degree of control authority is desired such as a new generation of high-performance, home washing machines now being developed.

scholarly journals Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1774 ◽  
Author(s):  
Hao Wu ◽  
Chongkai Yao ◽  
Chenghan Li ◽  
Miao Miao ◽  
Yujian Zhong ◽  
...  
Keyword(s):  
Soil Pollution ◽  
High Performance ◽  
Low Cost ◽  
Geotechnical Engineering ◽  
Drainage System ◽  
High Strength ◽  
Present Situation ◽  
Soft Foundation ◽  
And Function ◽  
Erosion Protection

Most geotextiles consist of polymers of polyolefin, polyester or polyamide family, which involve environmental problems related to soil pollution. Geotextiles can be used for at least one of the following functions: Separation, reinforcement, filtration, drainage, stabilization, barrier, and erosion protection. Due to the characteristics of high strength, low cost, and easy to use, geotextiles are widely used in geotechnical engineering such as soft foundation reinforcement, slope protection, and drainage system. This paper reviews composition and function of geotextiles in geotechnical engineering. In addition, based on literatures including the most recent data, the discussion turns to recent development of geotextiles, with emphasis on green geotextiles, intelligent geotextiles, and high-performance geotextiles. The present situation of these new geotextiles and their application in geotechnical engineering are reviewed.

A Review on Development and Properties of GLARE, an Advanced Aircraft Material

2014 ◽  
Vol 618 ◽  
pp. 140-145
Author(s):  
Yang Liu ◽  
Ren Zhang ◽  
En Quan Liang ◽  
Dong Li ◽  
Ying Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Composite Materials ◽  
Low Cost ◽  
High Strength ◽  
Aviation Industry ◽  
Conventional Aluminum Alloy ◽  
Civil Aircraft ◽  
Aircraft Material ◽  
History Of ◽  
New Generation

The history of GLARE laminate was introduced. Through comparison with conventional aluminum alloy sheets, the excellent performance of GLARE as a new generation aeronautic material is discussed. The properties and application of GLARE in large civil aircraft indicates that new composite materials such as GLARE will replace bulk aluminum alloy in future aircraft structure. With the continuous development of material technologies, a trend of developing high strength and low cost composite materials will lead aviation industry to a new stage.

High-Performance, Crimped Rayon Fiber

1976 ◽  
Vol 46 (3) ◽  
pp. 184-194 ◽  
Author(s):  
T. E. Muller ◽  
F. P. Barch ◽  
G. C. Daul
Keyword(s):  
Cross Section ◽  
High Performance ◽  
Full Range ◽  
High Strength ◽  
Cotton Fabrics ◽  
Textile Processing ◽  
Fiber Properties ◽  
Spin Bath ◽  
High Degree ◽  
Rayon Fiber

A high-wet-modulus crimped rayon fiber has been developed from a viscose system that utilizes a high-purity wood pulp, relatively low quantities of viscose modifiers, and viscose ripening controlled to allow the spinning of a highly-oriented rayon fiber with an unbalanced cross section. This results in a fiber which develops a high degree of both macro- and microcrimp. Viscose and spin-bath specifications must be rigidly observed, but spinning and fiber-relaxing conditions may be varied to adjust the development of crimp and fiber properties. This fiber performs well on conventional textile-processing equipment and can be spun into the full range of yarn counts that are normally defined by fiber denier. Resulting yarns have the high strength of the high-performance HWM rayons with the bulk and hand of cotton. Fabrics show better cover than that of similar fabrics woven from rayon control samples, and hand and dimensional stability are comparable to those of cotton. This fiber blends well with polyester and shows an advantage in cover over other rayon/polyester blends that are normally quite lean in appearance.

SUSTAINABLE ULTRA-HIGH-PERFORMANCE GLASS CONCRETE FOR INFRASTRUCTURES

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Arezki Tagnit-Hamou ◽  
Nancy A. Soliman
Keyword(s):  
High Performance ◽  
Glass Powder ◽  
Mechanical Performance ◽  
High Performance Concrete ◽  
Low Cost ◽  
Research Work ◽  
High Strength ◽  
Quartz Powder ◽  
Ultra High Performance Concrete ◽  
Powder Particles

This paper presents research work on the development of a green type of ultra-high-performance concrete using ground glass powders with different degrees of fineness (UHPGC). This article presents the development of an innovative, low-cost, and sustainable UHPGC through the use of glass powder to replace cement, and quartz powder particles. An UHPGC with a compressive strength (fc) of up to 220 MPa was prepared and its fresh, and mechanical properties were investigated. The test results indicate that the fresh UHPGC properties were improved when the cement and quartz powder were replaced with non-absorptive glass powder particles. The strength improvement can be attributed to the glass powder’s pozzolanicity and to its mechanical performance (very high strength and elastic modulus of glass). A case study of using this UHPGC is presented through the design and construction of a footbridge. Erection of footbridge at University of Sherbrooke Campus using UHPGC is also presented as a full-scale application.

A Study on Precipitation in Clean Micro Alloyed Steels

2001 ◽  
Vol 7 (S2) ◽  
pp. 1264-1265
Author(s):  
Yuanli Wang ◽  
Delu Liu ◽  
Jie Fu ◽  
Jian Zhu
Keyword(s):  
High Performance ◽  
Induction Furnace ◽  
Low Cost ◽  
Microalloyed Steels ◽  
Vacuum Induction Furnace ◽  
Low Carbon ◽  
Dominant Component ◽  
New Type ◽  
New Generation ◽  
Impurity Elements

Much attention has been devoted to develop the new generation of microalloyed steels in recent years to meet the needs of high performance and low cost for the 21st century. The new type of steels is characterized by reduced carbon content, improved cleanness and refined grain size through the phase transformations.11'21 Precipitation of the carbonitrides in the steels is also one of the keypoints for controlling mechanical properties of the steels.In the present work ultra-low carbon clean microalloyed steels, which contain 0.029∽0.047(wt)%C, 1.48∽1.54(wt)% Mn, 0.044∽0.052(wt)%Nb, 0.025∽0.044Ti(wt)%, 0.0015∽0.0020(wt)%B and 0.0045∽0.0070(wt)%N, were prepared in a vacuum induction furnace in laboratory. The contents of S and P of the steels are 0.0005(wt)% and 0.0010∽0.0024(wt)% respectively. Total amount of the impurity elements O, S, P and H in the steels is 0.0061∽0.0077%. Dominant component of the structure in both casting and as-forged samples is acicular ferrite or bainite.

Low Application Temperature Graded Structure Polyolefin Coating System Based on a Next Generation FBE for Strain-Based Design Pipelines Using High Strength Steel

2006 ◽  
Author(s):  
Stephen J. Edmondson ◽  
Dennis T. Wong ◽  
Robert E. Steele
Keyword(s):  
High Strength Steel ◽  
High Performance ◽  
Performance Test ◽  
Tensile Elongation ◽  
High Strength ◽  
Graded Structure ◽  
Track Record ◽  
Cooperative Development ◽  
Primary Responsibility ◽  
New Generation

Pipelines combining strain-based design with the use of thin walled, high strength steel (X80 or higher) present a significant challenge in terms of the availability of suitable coating systems. FBE-based coatings typically require the pipe to be heated to temperatures in the range of 230°C to 250°C for a period of up to 10 minutes in order to achieve optimum properties. The problem is that some of the key properties of such steels can change when they are subjected to such a heat cycle, resulting in a reduction in the tensile elongation at yield, a key requirement with strain-based design pipelines. When such pipelines are being constructed in remote areas, such as Northern Canada, there is the additional requirement that the coating must be robust enough to withstand transportation, handling and construction damage, and be bendable to temperatures as low as −50°C. Graded Structure Polyolefin Systems (GSPO) such as Bredero Shaw’s High Performance Composite Coating (HPCC) have established an excellent track record on pipelines constructed in very cold conditions through very rough terrain. However, such coatings are historically based on conventional fusion-bonded epoxy coatings designed for optimum performance when applied to pipes heated to 230 to 250°C. This paper describes a new version GSPO coating which can be produced without having the pipe temperature exceed 200°C at any point in the process, and which provides performance virtually identical to that of the standard GSPO product. It is the result of a cooperative development between Bredero Shaw and DuPont Powder Coatings, and is based on a new generation of FBE which can be processed at temperatures as low as 175°C with very little sacrifice in resistance to adhesion, as characterized by hot cathodic disbondment. Because the FBE has primary responsibility for providing corrosion resistance, the performance of the new generation FBE applied at low application temperatures was first compared to that of well-established FBE applied at their recommended application temperatures. Cathodic Disbondment (CD) was selected as the key performance test for adhesion because it simulates field conditions for disbonding of a coating from a pipeline with impressed current cathodic protection. Because the measurement of disbondment is on a continuous numerical scale, statistical analysis is possible. The new generation FBE coating performs significantly better in CD testing than conventional FBE when applied at lower application temperatures. Its performance is comparable to the best conventional FBE when applied at 240°C. This performance is maintained in the Low Application Temperature GSPO coating.

Ultra-high performance concrete – properties and technology

2013 ◽  
Vol 61 (1) ◽  
pp. 183-193 ◽  
Author(s):  
T. Zdeb
Keyword(s):  
Mechanical Properties ◽  
Hydrothermal Treatment ◽  
High Performance ◽  
High Performance Concrete ◽  
Qualitative Evaluation ◽  
High Strength ◽  
Ultra High Performance Concrete ◽  
Characteristic Features ◽  
Reactive Powder ◽  
New Generation

Abstract The paper deals with information concerning properties and technology of a new generation cementitious composite i.e. Ultra-High Performance Concrete. High performance here means both high strength and high durability under the influence of environmental factors. This group of composites is mainly represented by Reactive Powder Concretes (RPC), which show both outstanding durability and mechanical properties. Characteristic features of RPC are mainly due to the very low water-cement ratio, which involves application of superplasticizer, significant reduction of aggregate grains size as well as hydrothermal treatment. In the first part of the paper selected properties of RPC are compared to ordinary concrete and to other groups of new generation concrete. Moreover, fundamental technological factors influencing properties of RPC are described as well. The second part deals with the RPC developed at Cracow University of Technology. The presented test results are mainly focused on the influence of steel fibres content on mechanical properties of reactive powder concrete and hydrothermal treatment on composites microstructure. The quantitative and qualitative evaluation of this relationship expand the knowledge of the UHPC technology. Finally, the third part presents the most significant and newest structures which have been erected with the use of RPC

scholarly journals Low cost, high performance processing of single particle cryo-electron microscopy data in the cloud

2015 ◽  
Author(s):  
Michael A. Cianfrocco ◽  
Andres E. Leschziner
Keyword(s):  
Electron Microscopy ◽  
Single Particle ◽  
High Performance ◽  
Low Cost ◽  
Cost Effective ◽  
Cryo Electron Microscopy ◽  
Software Packages ◽  
Electron Microscopes ◽  
Microscopy Data ◽  
New Generation

The advent of a new generation of electron microscopes and direct electron detectors has realized the potential of single particle cryo-electron microscopy (cryo-EM) as a technique to generate high-resolution structures. However, calculating these structures requires high performance computing clusters, a resource that may be limiting to many likely cryo-EM users. To address this limitation and facilitate the spread of cryo-EM, we developed a publicly available ‘off-the-shelf’ computing environment on Amazon’s elastic cloud computing infrastructure. This environment provides users with single particle cryo-EM software packages and the ability to create computing clusters that can range in size from 16 to 480+ CPUs. Importantly, these computing clusters are also cost-effective, as we illustrate here by determining a near-atomic resolution structure of the 80S yeast ribosome for $28.89 USD in ~10 hours.

scholarly journals Planetary transmission for propeller propulsion in the new generation of flying models

Mechanik ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 282-284
Author(s):  
Jakub Sikorski ◽  
Witold Pawłowski ◽  
Łukasz Kaczmarek ◽  
Mariusz Stegliński ◽  
Sebastian Lipa ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
Planetary Gear ◽  
High Strength ◽  
Innovative Design ◽  
Gear Design ◽  
Low Weight ◽  
Planetary Transmission ◽  
Gyroscopic Effects ◽  
New Generation

The article presents a planetary gear design, which in combination with an electric motor will allow to obtain an increased torque enabling the propulsion of large, high-performance propellers of modern flying models. The proposed solution allows the use of standard high-speed DC or brushless motors. In addition, the innovative design of the transmission provides high stiffness of the mechanism necessary to counteract the gyroscopic effects generated by the large propeller. The use of high-strength aluminum alloy ensures low weight of the entire mechanism.

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