Design Guidelines for High Performance Industrial Furnaces

2002 ◽  
Keyword(s):  
High Performance ◽  
Design Guidelines

Flexural design of precast, prestressed ultra-high-performance concrete members

PCI Journal ◽  
2020 ◽  
Vol 65 (6) ◽  
pp. 35-61
Author(s):  
Chungwook Sim ◽  
Maher Tadros ◽  
David Gee ◽  
Micheal Asaad
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Limit State ◽  
Design Guidelines ◽  
Design Tool ◽  
Supplementary Cementitious Materials ◽  
Ultra High Performance Concrete ◽  
Concrete Members ◽  
Cylinder Strength

Ultra-high-performance concrete (UHPC) is a special concrete mixture with outstanding mechanical and durability characteristics. It is a mixture of portland cement, supplementary cementitious materials, sand, and high-strength, high-aspect-ratio microfibers. In this paper, the authors propose flexural design guidelines for precast, prestressed concrete members made with concrete mixtures developed by precasters to meet minimum specific characteristics qualifying it to be called PCI-UHPC. Minimum specified cylinder strength is 10 ksi (69 MPa) at prestress release and 18 ksi (124 MPa) at the time the member is placed in service, typically 28 days. Minimum flexural cracking and tensile strengths of 1.5 and 2 ksi (10 and 14 MPa), respectively, according to ASTM C1609 testing specifications are required. In addition, strain-hardening and ductility requirements are specified. Tensile properties are shown to be more important for structural optimization than cylinder strength. Both building and bridge products are considered because the paper is focused on capacity rather than demand. Both service limit state and strength limit state are covered. When the contribution of fibers to capacity should be included and when they may be ignored is shown. It is further shown that the traditional equivalent rectangular stress block in compression can still be used to produce satisfactory results in prestressed concrete members. A spreadsheet workbook is offered online as a design tool. It is valid for multilayers of concrete of different strengths, rows of reinforcing bars of different grades, and prestressing strands. It produces moment-curvature diagrams and flexural capacity at ultimate strain. A fully worked-out example of a 250 ft (76.2 m) span decked I-beam of optimized shape is given.

Mechanical Reliability of Silicon Microstructures

2021 ◽  
Author(s):  
Toshiyuki Tsuchiya
Keyword(s):  
High Performance ◽  
Measurement Data ◽  
Design Guidelines ◽  
Fatigue Properties ◽  
Mechanical Reliability ◽  
Effective Parameters ◽  
Micro Electro Mechanical Systems ◽  
Device Reliability ◽  
Silicon Microstructures ◽  
Silicon Based

Abstract In this article, an overview of the mechanical reliability of silicon microstructures for micro-electro-mechanical systems (MEMS) is given to clarify what we now know and what we still have to know about silicon as a high-performance mechanical material on the microscale. Focusing on the strength and fatigue properties of silicon, attempts to understand the reliability of silicon and to predict the device reliability of silicon-based microstructures are introduced. The effective parameters on the strength and the mechanism of fatigue failure are discussed with examples of measurement data to show the design guidelines for highly reliable silicon microstructures and devices.

Stress Analyses of Flip TAB Interconnects in Multi-Chip Module Assembly

1991 ◽  
Vol 113 (3) ◽  
pp. 226-232 ◽  
Author(s):  
Ben Nagaraj ◽  
Mali Mahalingam
Keyword(s):  
High Performance ◽  
Heat Dissipation ◽  
Mechanical Load ◽  
Design Guidelines ◽  
Physical Contact ◽  
Thermal Loads ◽  
Force Components ◽  
Effect Of The Support ◽  
Supporting Element ◽  
Generic Design

Flip Tape Automated Bond (FTAB) interconnect is one of the leading candidates for device to substrate interconnection in a high performance Multi-Chip Module (MCM). The TAB interconnect becomes a structural member in the MCM assembly, bearing both “mechanical” and “thermal” loads. Further, to accomplish high thermal performance in the assembly, physical contact to the device may be made under substantial contact pressures. The device may be supported by elastic structures to redistribute the interconnect forces. Finite Element Methods (FEM) are used to analyze the structural behavior of TAB interconnects under (i) the applied mechanical load to the device and (ii) the thermal loads due to the heat dissipation in the device. Variation of the force components on the TAB interconnects and the maximum failure criterion based on the stresses in the interconnects are reported. Effect of the support area and the modulus of the supporting element on the interconnects are discussed. Generic design guidelines are presented for flip TAB interconnect based MCM assembly.

Nanoimprinted distributed feedback lasers comprising TiO2 thin films: Design guidelines for high performance sensing

2013 ◽  
Vol 7 (6) ◽  
pp. 1036-1042 ◽  
Author(s):  
Christoph Vannahme ◽  
Michael C. Leung ◽  
Frank Richter ◽  
Cameron L. C. Smith ◽  
Pétur G. Hermannsson ◽  
...  
Keyword(s):  
Thin Films ◽  
High Performance ◽  
Design Guidelines ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers ◽  
Tio2 Thin Films

scholarly journals Laboratory characterization of Cor-Tuf Baseline and UHPC-S

2021 ◽  
Author(s):  
Dylan Scott ◽  
Steven Graham ◽  
Bradford Songer ◽  
Brian Green ◽  
Michael Grotke ◽  
...  
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
The United States ◽  
Design Guidelines ◽  
Ultra High Performance Concrete ◽  
Laboratory Characterization ◽  
Potential Benefits ◽  
The Republic ◽  
Protective Structures

This experimental effort is part of a larger program entitled Development of Ultra-High-Performance Concrete Tools and Design Guidelines. This program operates in accordance with an agreement concerning combating terrorism research and development between the United States of America Department of Defense and the Republic of Singapore Ministry of Defence. The objective of the program is to develop a better understanding of the potential benefits that may be achieved from the application of ultra-high-performance concrete (UHPC) materials for protective structures. The specific effort detailed in this report will provide insight into laboratory-scale mechanical properties of Cor-Tuf and a proprietary material termed UHPC-Singapore (UHPC-S).

A Forensic-as-a-Service Delivery Platform for Law Enforcement Agencies

2013 ◽  
pp. 313-330 ◽  
Author(s):  
Fabio Marturana ◽  
Simone Tacconi ◽  
Giuseppe F. Italiano
Keyword(s):  
Law Enforcement ◽  
Service Delivery ◽  
High Performance ◽  
Low Cost ◽  
Forensic Analysis ◽  
Design Guidelines ◽  
Functional Requirements ◽  
Law Enforcement Agencies ◽  
Novel Approach ◽  
Service Delivery Platform

With the global diffusion of cybercrime, the ever-growing market penetration of high-performance and low-cost personal digital devices, and the commercial success of cloud computing, the area of digital forensics is faced with various new challenges that must be taken seriously. In this chapter, the authors describe a novel approach to digital investigations based on the emerging “Forensics as a Service” (FaaS) model. This model attempts to optimize Law Enforcement Agency’s (LEA) forensic procedures, reduce complexity, and save operational costs. Inspired by previous work on distributed computing for forensic analysis, this chapter provides the reader with design guidelines of a FaaS platform for secure service delivery. The proposed FaaS platform should be able to support investigators and practitioners in their daily tasks (e.g. digital evidence examination, analysis, and reporting) once implemented by a cloud forensic provider or internally by a LEA. In this chapter, the authors also present the architecture components, interfaces, communication protocols, functional and non-functional requirements, as well as security specifications of the proposed framework in detail.

CONSISTENCY OF FLY ASH AND METAKAOLIN CONCRETE

2009 ◽  
Vol 15 (2) ◽  
pp. 131-135 ◽  
Author(s):  
Jiping Bai ◽  
Albinas Gailius
Keyword(s):  
Fly Ash ◽  
Confidence Intervals ◽  
Statistical Models ◽  
High Performance ◽  
Design Guidelines ◽  
Experimental Results ◽  
Wide Range ◽  
Practical Design ◽  
Significance Levels ◽  
Prediction Limits

As high‐performance Portland cement (PC), fly ash (FA) and metakaolin (MK) concrete have been developed in wide applications, it has growing interest in optimizing and predicting consistency of fresh PC‐FA‐MK concrete for efficient and practical design and construction. This paper presents statistical models for predicting the consistency of concrete incorporating PC, FA and MK from the experimental results of standard consistency tests. They reflect the effect of variations of pozzolanic replacement materials including FA and MK at graduated replacement levels of up to 40% and 15%, respectively. The predictions produced are compared with the experimental results of consistency of concrete blends. Models show that they can be used to predict the consistency parameters including slump, compacting factor and Vebe time with a good degree of accuracy in a wide range of FA‐MK blends. Design guidelines for evaluating consistency parameters are tentatively recommended along with their confidence intervals for prediction limits at 5% significance levels. Santrauka Straipsnyje aprašyti cementbetonio mišinio su lakiaisiais pelenais ir metakaolinu konsistencijos (slankumo, sutankinamumo, Vebe rodiklio) tyrimai. Parenkant betono mišinių sudėtis buvo naudojami lakieji pelenai, kurie pakeisdavo iki 40 % portlandcemenčio ir metakaolinas, kurio buvo dedama iki 15 % cemento masės. Atitinkamai buvo keičiami ir portlandcemenčio kiekiai. Remiantis tyrimų rezultatais, pasiūlyti statistiniai modeliai įvairių sudėčių betono mišinio konsistencijai prognozuoti. Palyginus prognozuojamus ir eksperimentinių tyrimų betono mišinio konsistencijos rodiklius nustatyta, kad jie labai gerai koreliuoja. Todėl pasiūlytus statistinius prognozavimo modelius galima taikyti betonų technologijos praktikoje.

scholarly journals Flexure strength prediction of closure strip between prefabricated deck slabs supported over bridge girders incorporating CFRP bars and UHPFRC

2021 ◽  
Author(s):  
Mohtady Moataz Sherif
Keyword(s):  
High Performance ◽  
Design Guidelines ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Gfrp Bars ◽  
Deck Panels ◽  
Girder Bridges ◽  
Glass Fiber Reinforced ◽  
High Performance Fiber ◽  
Experimental Findings

Glass fiber reinforced polymer (GFRP) bars are used in bridge decks to overcome the problem of corrosion of steel bars and concrete spalling. However, design guidelines for joints between GFRPreinforced precast deck panels supported over girders for accelerated bridge replacement is as yet unavailable. The proposed research investigates the use of GFRP bars in the closure strip between jointed precast deck panels, which is filled with ultra-high performance fiber-reinforced concrete (UHPFRC). Four different bar splice lengths in the joint were considered in this study, namely: 75, 105, 135 and 165 mm, with bar splice spacing taken as 0, 75 and 100 mm. 27 specimens were constructed and tested to-collapse to determine their structural behavior and load carrying capacity. Correlation between experimental findings and available design equations for moment and shear capacities was conducted, leading to recommendations for the use of the proposed joints between precast deck panels in slab-on-girder bridges.

scholarly journals An Approach to Determine Specific Targets of Daylighting Metrics and Solar Gains for Different Climatic Regions

2021 ◽  
Vol 8 (1) ◽  
pp. 1-19
Author(s):  
Doris A. Chi ◽  
Keyword(s):  
High Performance ◽  
Energy Use ◽  
Principal Component ◽  
Performance Standards ◽  
Integrated Approach ◽  
Statistical Technique ◽  
Design Guidelines ◽  
Temperate Climate ◽  
Design Strategies ◽  
Climate Conditions

This study comes from an integrated approach combining daylighting and thermal aspects of building spaces. Several room configurations derived from the combination of four main design variables are tested. Width-to-Depth-Ratio (WDR), Window-to-Wall-Ratio (WWR), orientation, and climate conditions are simultaneously investigated to find the best solutions that enhance the Daylight Availability and, at the same time, diminish solar gains and total energy use (lighting plus cooling and heating). Principal Component Analysis (PCA) is the statistical technique used to outline design guidelines for Mexican climate regions, namely arid, tropical, and temperate. Hence, optimal values for WDR and WWR were recommended for specific orientations and climates. Therefore, PCA is set as the basis of a methodology to define design strategies for specific locations and climates that further lead to updating high-performance standards in buildings at regional levels. Results also showed that climate conditions, such as seasonal cloud cover, temperature, and solar radiation, are crucial when establishing target limits for the actual daylit and over lit areas. The temperate climate was able to endure up to 60% as over lit area. Instead, the arid and tropical climates tolerated up to 50% and 40%, respectively, as over lit areas.

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