Hyperplastic Forming: Process Potential and Factors Affecting Formability

AbstractThis paper has two distinct goals. First, we argue in an extended introduction that high velocity forming, as can be implemented through electromagnetic forming, is a technology that should be developed. As a process used in conjunction with traditional stamping, it may offer dramatically improved formability, reduced wrinkling and active control of springback among other advantages. In the body of the paper we describe the important factors that lead to improved formability at high velocity. In particular, high sample velocity can inhibit neck growth. There is a sample size dependence where larger samples have better ductility than those of smaller dimensions. These aspects are at least partially described by the recent model of Freund and Shenoy. In addition to this, boundary conditions imposed by sample launch and die impact can have important effects on formability.

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Characteristics and Determinants of New Start-ups in Gujarat, India

Entrepreneurship Review ◽

10.38157/entrepreneurship-review.v1i2.154 ◽

2020 ◽

Vol 1 (2) ◽

pp. 1-25

Author(s):

Ajay Kumar ◽

Bhim Jyoti

Keyword(s):

Sample Size ◽

Regression Models ◽

New Products ◽

Small Sample ◽

The Body ◽

High Tech ◽

Annual Sale ◽

Factors Affecting ◽

Start Up ◽

Start Ups

Purpose: This study examines the relationship of socio-economic characteristics of start-ups with their size in Gujarat, India. It also assesses the determinants affecting the annual sale of start-ups. Methods: It includes primary information based on a survey of 120 founders of start-ups. Linear and semi-log linear regression models have been applied to assess the determinants of start-ups. Probit regression models have been considered to assess the factors affecting the annual sale of the start-ups. Results: Stage of start-up, the participation of founders in conferences, educational qualification, and new products launched by start-ups, professional connections of founders, source of funding, and support from incubator/accelerator/supporting organizations are found crucial determinants of start-up size in Gujarat. The annual sales of the start-ups are positively associated with stage of start-up, support from a mentor, team members, founder's academic qualification, and collaboration with national or international organizations, unskilled workers. Implications: Technology transfer and commercialization, development of new products, government regulations, the requirement of costumers, free rights for entrepreneurs, appropriate financial support for new entrepreneurs, transparency and clarity in government policies, the establishment of high-tech start-ups, and development of digital infrastructure, increase in R&D spending in research academia, and association of research institutions with entrepreneurs would be conducive to create an appropriate start-ups ecosystem and to reduce regional development disparities across Indian states. Subsequently, it would be helpful to increase sustainable development in India. Originality: This study has used primary information of 120 founders of start-ups to assess the determinants, and the factors affecting annual sales of start-ups using the regression model in, Gujrat, India. Thus, it has an empirical contribution to the body of knowledge. Limitations: This study could not provide rational justifications on most factors that show an insignificant impact on start-ups due to the small sample size. Further research, therefore, may be considered to identify the association of start-up size with the variables using a large sample size in India.

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Shape Optimization and Strength Evaluation of Metal Welded Bellows Wave of Mechanical Seal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.33-37.1377 ◽

2008 ◽

Vol 33-37 ◽

pp. 1377-1382 ◽

Cited By ~ 2

Author(s):

Halida Musha ◽

Mamtimin Gheni ◽

Buhalqam

Keyword(s):

Numerical Simulation ◽

Bone Mass ◽

Boundary Conditions ◽

Shape Optimization ◽

Reaction Diffusion ◽

Mechanical Seal ◽

Forming Process ◽

Strength Evaluation ◽

Fem Method ◽

Initial Load

In this paper, the iBone (Imitation Bone) model which is coupled with Turing reaction-diffusion system and FEM, is used. The numerical simulation of bone forming process by considering the osteoclasts and osteoblasts process are conducted. The bone mass is increased with increase of the initial load value, then fibula and femur bones are obtained respectively by keeping the required bone forming value. The new S shape wave of metal welded bellow of mechanical seal are designed based on the the optimization results through this method. The S shape and V shape both were analyzed with FEM method. The same boundary conditions were given for two types of wave. The results are shown that the stresses mainly concentrated on the welded area. It is interesting that the value of the stresses of the two types of wave basically same. However, compressibility of the two types of wave is very different at the same computation stage. The compressibility of S shape wave was higher than V shape.

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Ecological and Physiological Factors Affecting Brood Patch Area and Prolactin Levels in Arctic-Nesting Geese

The Auk ◽

10.1093/auk/123.2.405 ◽

2006 ◽

Vol 123 (2) ◽

pp. 405-418 ◽

Cited By ~ 3

Author(s):

Jón Einar Jónsson ◽

Alan D. Afton ◽

Ray T. Alisauskas ◽

Cynthia K. Bluhm ◽

Mohamed E. El Halawani

Keyword(s):

Body Condition ◽

The Body ◽

Nest Size ◽

Patch Area ◽

Physiological Factors ◽

Factors Affecting ◽

Chen Caerulescens ◽

Brood Patch ◽

Snow Geese ◽

Ross's Geese

AbstractWe investigated effects of ecological and physiological factors on brood patch area and prolactin levels in free-ranging Lesser Snow Geese (Chen caerulescens caerulescens; hereafter “Snow Geese”) and Ross's Geese (C. rossii). On the basis of the body-size hypothesis, we predicted that the relationships between prolactin levels, brood patch area, and body condition would be stronger in Ross's Geese than in the larger Snow Geese. We found that brood patch area was positively related to clutch volume and inversely related to prolactin levels in Ross's Geese, but not in Snow Geese. Nest size, nest habitat, and first egg date did not affect brood patch area in either species. Prolactin levels increased as incubation progressed in female Snow Geese, but this relationship was not significant in Ross's Geese. Prolactin levels and body condition (as indexed by size-adjusted body mass) were inversely related in Ross's Geese, but not in Snow Geese. Our findings are consistent with the prediction that relationships between prolactin levels, brood patch area, and body condition are relatively stronger in Ross's Geese, because they mobilize endogenous reserves at faster rates than Snow Geese.Factores Ecológicos y Fisiológicos que Afectan el Área del Parche de Incubación y los Niveles de Prolactina en Gansos Nidificantes del Ártico

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Coil-less electromagnetic forming process with uniform-pressure characteristics for shaping sheet metals

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2021.07.065 ◽

2021 ◽

Vol 70 ◽

pp. 140-151

Author(s):

Quanliang Cao ◽

Xian Li ◽

Zhenhao Li ◽

Limeng Du ◽

Liangyu Xia ◽

...

Keyword(s):

Electromagnetic Forming ◽

Uniform Pressure ◽

Sheet Metals ◽

Forming Process ◽

Pressure Characteristics

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Boundaries Influence on the Flow Field Around an Oscillating Sphere

Volume 7: CFD and VIV ◽

10.1115/omae2013-11385 ◽

2013 ◽

Cited By ~ 3

Author(s):

Domenica Mirauda ◽

Antonio Volpe Plantamura ◽

Stefano Malavasi

Keyword(s):

Free Surface ◽

Flow Field ◽

Boundary Conditions ◽

Damping Ratio ◽

Water Channel ◽

Open Water ◽

Free Surface Flows ◽

The Body ◽

Sphere Diameter ◽

Oscillating Sphere

This work analyzes the effects of the interaction between an oscillating sphere and free surface flows through the reconstruction of the flow field around the body and the analysis of the displacements. The experiments were performed in an open water channel, where the sphere had three different boundary conditions in respect to the flow, defined as h* (the ratio between the distance of the sphere upper surface from the free surface and the sphere diameter). A quasi-symmetric condition at h* = 2, with the sphere equally distant from the free surface and the channel bottom, and two conditions of asymmetric bounded flow, one with the sphere located at a distance of 0.003m from the bottom at h* = 3.97 and the other with the sphere close to the free surface at h* = 0, were considered. The sphere was free to move in two directions, streamwise (x) and transverse to the flow (y), and was characterized by values of mass ratio, m* = 1.34 (ratio between the system mass and the displaced fluid mass), and damping ratio, ζ = 0.004. The comparison between the results of the analyzed boundary conditions has shown the strong influence of the free surface on the evolution of the vortex structures downstream the obstacle.

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Determination of Flow Curves at High Strain Rates using the Electromagnetic Forming Process and an Iterative Finite Element Simulation Scheme

CIRP Annals ◽

10.1016/s0007-8506(07)60413-2 ◽

2006 ◽

Vol 55 (1) ◽

pp. 267-270 ◽

Cited By ~ 16

Author(s):

M. Kleiner ◽

A. Brosius

Keyword(s):

Finite Element ◽

Finite Element Simulation ◽

High Strain ◽

Electromagnetic Forming ◽

Strain Rates ◽

Forming Process ◽

Flow Curves ◽

Element Simulation ◽

Simulation Scheme

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Mixed qualitative–quantitative approach for bidding decisions in construction

Engineering Construction & Architectural Management ◽

10.1108/ecam-12-2020-1060 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Emad Mohamed ◽

Parinaz Jafari ◽

Ahmed Hammad

Keyword(s):

Expert System ◽

Expert Knowledge ◽

The Body ◽

Decision Makers ◽

Quantitative Approach ◽

Rule Based ◽

Content Type ◽

Factors Affecting ◽

Qualitative And Quantitative ◽

Mixed Approach

PurposeThe bid/no-bid decision is critical to the success of construction contractors. The factors affecting the bid/no-bid decision are either qualitative or quantitative. Previous studies on modeling the bidding decision have not extensively focused on distinguishing qualitative and quantitative factors. Thus, the purpose of this paper is to improve the bidding decision in construction projects by developing tools that consider both qualitative and quantitative factors affecting the bidding decision.Design/methodology/approachThis study proposes a mixed qualitative-quantitative approach to deal with both qualitative and quantitative factors. The mixed qualitative-quantitative approach is developed by combining a rule-based expert system and fuzzy-based expert system. The rule-based expert system is used to evaluate the project based on qualitative factors and the fuzzy expert system is used to evaluate the project based on the quantitative factors in order to reach the comprehensive bid/no-bid decision.FindingsThree real bidding projects are used to investigate the applicability and functionality of the proposed mixed approach and are tested with experts of a construction company in Alberta, Canada. The results demonstrate that the mixed approach provides a more reliable, accurate and practical tool that can assist decision-makers involved in the bid/no-bid decision.Originality/valueThis study contributes theoretically to the body of knowledge by (1) proposing a novel approach capable of modeling all types of factors (either qualitative or quantitative) affecting the bidding decision, and (2) providing means to acquire, store and reuse expert knowledge. Practical contribution of this paper is to provide decision-makers with a comprehensive model that mimics the decision-making process and stores experts' knowledge in the form of rules. Therefore, the model reduces the administrative burden on the decision-makers, saves time and effort and reduces bias and human errors during the bidding process.

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Numerical Solution of a Hydrofoil Moving Near an Interface

Journal of Ship Research ◽

10.5957/jsr.1996.40.4.269 ◽

1996 ◽

Vol 40 (04) ◽

pp. 269-277

Author(s):

G. X. Wu ◽

T. Miloh ◽

G. Zilman

Keyword(s):

Boundary Conditions ◽

Numerical Solution ◽

Body Surface ◽

Iteration Scheme ◽

The Body ◽

Two Fluids ◽

Linearized Theory

The problem of a hydrofoil moving near an interface of two fluids of different densities is analyzed. An iteration scheme is proposed which imposes the boundary conditions on the body surface and on the interface alternately. The numerical solution is obtained by using the linearized theory and a Glauert-type expansion for the vortex distribution. Results are provided for various cases with different densities and different speeds.

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Electrodermal Response in Gaming

Journal of Computer Networks and Communications ◽

10.1155/2011/610645 ◽

2011 ◽

Vol 2011 ◽

pp. 1-14 ◽

Cited By ~ 5

Author(s):

J. Christopher Westland

Keyword(s):

Computer Games ◽

Emotional Response ◽

Human Subjects ◽

Skin Resistance ◽

The Body ◽

Electrodermal Response ◽

Factors Affecting ◽

Measuring Devices ◽

History Of ◽

Body Resistance

Steady improvements in technologies that measure human emotional response offer new possibilities for making computer games more immersive. This paper reviews the history of designs a particular branch of affective technologies that acquire electrodermal response readings from human subjects. Electrodermal response meters have gone through continual improvements to better measure these nervous responses, but still fall short of the capabilities of today's technology. Electrodermal response traditionally have been labor intensive. Protocols and transcription of subject responses were recorded on separate documents, forcing constant shifts of attention between scripts, electrodermal measuring devices and of observations and subject responses. These problems can be resolved by collecting more information and integrating it in a computer interface that is, by adding relevant sensors in addition to the basic electrodermal resistance reading to untangle (1) body resistance; (2) skin resistance; (3) grip movements; other (4) factors affecting the neural processing for regulation of the body. A device that solves these problems is presented and discussed. It is argued that the electrodermal response datastreams can be enriched through the use of added sensors and a digital acquisition and processing of information, which should further experimentation and use of the technology.

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