Local defects in extended ductile amorphous wires produced by the Ulitovsky – Taylor method

2020 ◽  
Vol 10 ◽  
pp. 69-78
Author(s):  
V. V. Molokanov ◽  
◽  
A. N. Krutilin ◽  
N. A. Palii ◽  
O. S. Antonova ◽  
...  
Keyword(s):  
Continuous Process ◽  
Geometric Parameters ◽  
Amorphous Wire ◽  
Glass Coating ◽  
Glass Shell ◽  
Gas Porosity ◽  
Amorphous Wires ◽  
Coated Wires ◽  
Local Defects ◽  
The Impact

Typical local defects were identified in extended ductile amorphous Co-based alloy wires, having 50 – 110 µm in diameter, obtained by Ulitovsky – Taylor in a continuous process of drawing a jet of melt in a glass shell. The studies found that gas pores and necks are local defects of glass-coated wires. The paper analyses the impact of the dissolved in the metal melt gas and glass-coating stress on the drawing process stability and the geometric parameters of the wire. The formation of hidden pores is due to gas expelling and redistribution of gas following the melt stream solidification. It is noted that gas porosity would not result in spontaneous breaks and changes in wire geometry. The characteristic form of a brittle rupture of an amorphous wire was observed upon fracture by bending in the region of gas porosity. It was in the studies revealing that amorphous wire neck formation was caused by high temperature transverse ring cracking of the glass-coating in contact with quenching liquid. Elastic deformation of amorphous wire in the vicinity of neck flows through the mechanism of formation and sliding transverse shear band. It is noted that the longitudinal destruction of the glass shell does not affect the geometric parameters of the amorphous wire. The procedures for local defects eliminating while producing ductile amorphous wires and the possible prospects for the variable diameter wires manufacturing are proposed.

Sex and Conception Probability

2021 ◽  
Author(s):  
Justin C. Konje ◽  
Oladipo A. Ladipo
Keyword(s):  
Menstrual Cycle ◽  
Sexual Intercourse ◽  
Time Window ◽  
Continuous Process ◽  
Female Genital Tract ◽  
Human Reproduction ◽  
Current Evidence ◽  
Fertile Window ◽  
Time Period ◽  
The Impact

Central to the survival of any species is the ability to procreate. In most cases, procreation is sexual, involving a process that ensures appropriate and timed contact between the male and female gametes. Successful human reproduction is premised on sexual intercourse occurring at a time when there is a receptive endometrium as well as an ovum ready for fertilization by spermatozoa. This time window of the menstrual cycle known as the fertile or fecund window is poorly defined and highly variable from one individual to another. Furthermore, while spermatogenesis is a continuous process, the impact of too frequent intercourse (defined as that occurring more than every 2 to 3 days) on fertilization has often been thought to be associated with a decreased fertilization potential of spermatozoa. Current evidence challenges previously held views on the fertile window and how it is determined, the timing of intercourse and how it is related to conception and miscarriages, the length of the luteal phase, and the precise time period during which the chances of fertilization are highest in any given menstrual cycle. The ability of spermatozoa to survive in the female genital tract for 5 days means fertilization can occur up to 5 days from sexual intercourse. During each menstrual cycle, there is a window of 5 to 6 days for fertilization to occur, and this period is defined not by the length of the cycle but by the timing of ovulation, with the chances of fertilization highest with intercourse occurring 1 to 2 days before ovulation.

scholarly journals Towards Continuous Production of Shaped Honeycombs

2018 ◽  
Author(s):  
Sam E. Calisch ◽  
Neil A. Gershenfeld
Keyword(s):  
High Performance ◽  
Continuous Production ◽  
Continuous Process ◽  
Three Dimensional ◽  
Sandwich Panels ◽  
Performance Space ◽  
Bending Loads ◽  
Future Work ◽  
The Impact ◽  
Parallel Folding

Honeycomb sandwich panels are widely used for high performance parts subject to bending loads, but their manufacturing costs remain high. In particular, for parts with non-flat, non-uniform geometry, honeycombs must be machined or thermoformed with great care and expense. The ability to produce shaped honeycombs would allow sandwich panels to replace monolithic parts in a number of high performance, space-constrained applications, while also providing new areas of research for structural optimization, distributed sensing and actuation, and on-site production of infrastructure. Previous work has shown methods of directly producing shaped honeycombs by cutting and folding flat sheets of material. This research extends these methods by demonstrating work towards a continuous process for the cutting and folding steps of this process. An algorithm for producing a manufacturable cut-and-fold pattern from a three-dimensional volume is designed, and a machine for automatically performing the required cutting and parallel folding is proposed and prototyped. The accuracy of the creases placed by this machine is characterized and the impact of creasing order is demonstrated. Finally, a prototype part is produced and future work is sketched towards full process automation.

The Evolution Model of Emergency Response System for Sudden Accidents of Construction Projects

2012 ◽  
Vol 226-228 ◽  
pp. 2253-2257
Author(s):  
Ren Hui Liu ◽  
Bo Yu
Keyword(s):  
Emergency Response ◽  
Construction Projects ◽  
Nonlinear Differential Equations ◽  
Continuous Process ◽  
Construction Project ◽  
Equation Model ◽  
Emergency Response System ◽  
Response System ◽  
The Impact ◽  
Emergency System

It is a nonlinear complex system for project emergency response system, that is a continuous process for the evolution of emergency construction project development process. The nonlinear differential equations that can describe the sudden emergency construction project the evolution of mathematical models. Emergency system by Logistic model was modified, taking into account the development of emergency systems will certainly be outside the system during the impact, combined with the project incidents of law principles of the role of Heinrich proposed TS-based emergency response system evolution equation Model, demonstrated the system at different stages of the emergency rules and features. For the emergency system in which the different stages of development, the corresponding measures to improve emergency response capabilities.

Experimental Investigation and Characterization of the Rotating Stall in a High Pressure Centrifugal Compressor: Part II — Influence of Diffuser Geometry on Stage Performance

2002 ◽  
Author(s):  
G. Ferrara ◽  
L. Ferrari ◽  
C. P. Mengoni ◽  
M. De Lucia ◽  
L. Baldassarre
Keyword(s):  
Experimental Tests ◽  
Rotating Stall ◽  
Geometric Parameters ◽  
Flow Coefficient ◽  
Low Flow ◽  
Main Task ◽  
Stage Performance ◽  
The Impact ◽  
Prediction Criteria

Extensive research on centrifugal compressors has been planned. The main task of the research is to improve present prediction criteria coming from the literature with particular attention to low flow coefficient impellers (low width to radius ratios) where they are no more valid. Very little data has been published for this kind of stages, especially for the last stage configuration (with discharge volute). Many experimental tests have been planned to investigate different configurations. A simulated stage with a backward channel upstream, a 2D impeller with a vaneless diffuser and a constant cross section volute downstream constitute the basic configuration. Several diffuser types with different widths, pinch shapes and diffusion ratios were tested. The effect of geometric parameters on stage stability has been discussed inside part I of the present work; the purpose of this part of the work is to illustrate the effect of the same geometric parameters on stage performance and to quantify the impact of stability improvements on stage losses.

scholarly journals Effect of electrode material on removal efficiency regarding single discharges in wire EDM

2021 ◽  
Author(s):  
Lukas Welschof ◽  
Niklas Schäfer ◽  
Tim Herrig ◽  
Andreas Klink ◽  
Thomas Bergs
Keyword(s):  
Removal Efficiency ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Continuous Process ◽  
Wire Edm ◽  
Procedural Understanding ◽  
Decisive Importance ◽  
Effective Removal ◽  
Coated Wires ◽  
The Individual

AbstractFor the precise machining of demanding materials, wire electrical discharge machining (WEDM) is a flexible and often irreplaceable manufacturing process. In order to enhance productivity as the main focus of the wire EDM process, the advancement of the fundamental procedural understanding is of decisive importance. In order to be able to energetically evaluate the removal process, the individual energetic contributors of the process hence the individual discharges need to be understood in terms of their contribution to material removal. In this paper, an experimental setup is presented, which permits the generation of individual discharges on a modern industrial wire EDM machine tool. For three different wire electrodes, the correlation of the discharge energy and the individual removal volume is quantitatively described, showing that coated wires achieve a significantly higher energy-specific removal. Furthermore the removal efficiency is defined as a key figure to transfer the findings to the continuous process and compare theoretical and effective removal rate.

Use of Selected Geospatial Tools for the Purposes of Reconnaissance

2020 ◽  
Vol 12 (2) ◽  
pp. 40-41
Author(s):  
Maciej Zaorski
Keyword(s):  
Decision Making ◽  
Continuous Process ◽  
Decision Making Process ◽  
Site Assessment ◽  
Geospatial Tools ◽  
The Military ◽  
The Impact ◽  
Traffic Corridors ◽  
Modern Technologies

The implementation of modern tools in the military system constitutes an important step in supporting the decision-making process. The impact of new GIS technologies is important for the assessment of the battlefield . According to assumptions, reconnaissance is a continuous process that crowns the assessment of the opponent and of the battlefield. Site assessment is an element of the command process where the conclusions of the task analysis includes an assessment of the potential opponent together with his modus operandi and an assessment of the environment . As part of the Information Preparation of the Battlefield (hereinafter referred to as IPB), the identification of threats and limitations has an impact on the identification of potential approach routes, traffic corridors and maneuvers in assigned areas and lanes . The end result is the determination of the maneuverability of forces and resources owned or those of the opponent. The information is to relate to the impact of the terrain components on the scope and nature of conducted activities, and the hydrometeorological conditions are to relate to the impact on the terrain, equipment, and people . As far as it regards the analysis of the environment and the opponent, it is possible to apply modern technologies to shorten the time for the analyses performed within the ongoing decision-making process.

scholarly journals Impact of HIV-1 Diversity on Its Sensitivity to Neutralization

Vaccines ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 74 ◽  
Author(s):  
Karl Stefic ◽  
Mélanie Bouvin-Pley ◽  
Martine Braibant ◽  
Francis Barin
Keyword(s):  
Public Health ◽  
Envelope Protein ◽  
Neutralizing Antibodies ◽  
Continuous Process ◽  
Population Level ◽  
Global Public Health ◽  
Broadly Neutralizing Antibodies ◽  
The Many ◽  
The Impact ◽  
Hiv 1

The HIV-1 pandemic remains a major burden on global public health and a vaccine to prevent HIV-1 infection is highly desirable but has not yet been developed. Among the many roadblocks to achieve this goal, the high antigenic diversity of the HIV-1 envelope protein (Env) is one of the most important and challenging to overcome. The recent development of broadly neutralizing antibodies has considerably improved our knowledge on Env structure and its interplay with neutralizing antibodies. This review aims at highlighting how the genetic diversity of HIV-1 thwarts current, and possibly future, vaccine developments. We will focus on the impact of HIV-1 Env diversification on the sensitivity to neutralizing antibodies and the repercussions of this continuous process at a population level.

scholarly journals The impact of haulroad geometric parameters on open pit mine strip ratio

2019 ◽  
Vol 72 (1 suppl 1) ◽  
pp. 25-31
Author(s):  
Douglas Alexandre Gonçalves Alegre ◽  
Rodrigo de Lemos Peroni ◽  
Eduardo da Rosa Aquino
Keyword(s):  
Open Pit Mine ◽  
Geometric Parameters ◽  
Open Pit ◽  
The Impact

On the Effective Properties of 3D Metamaterials

2016 ◽  
Author(s):  
Mohamed Abdelhamid ◽  
Aleksander Czekanski
Keyword(s):  
Elastic Modulus ◽  
Effective Properties ◽  
Lattice Structure ◽  
Surface Elasticity ◽  
Geometric Parameters ◽  
Stiffness Tensor ◽  
Loading Direction ◽  
Octet Truss ◽  
The Impact ◽  
Effective Mechanical Properties

A continuum-based model is developed for the octet-truss unit cell in order to describe the effective mechanical properties (elastic modulus) of the lattice structure. This model is to include different geometric parameters that impact the structural effects; these parameters are: lattice angle, loading direction, thickness to diameter ratio, diameter to length ratio, and ellipticity. All these geometric parameters are included in the stiffness matrix, and the impact of each parameter on the stiffness tensor is investigated. Specifically, the effect of the lattice angle on the elastic moduli is discussed, and the loading direction of the highest elastic modulus is investigated for different lattice angles. Furthermore, the Gurtin-Murdoch model of surface elasticity is used to include the size effect in the stiffness tensor, as well as anisotropy of this model is investigated.

Parametric Experimental and Numerical Study of LP Diffuser and Exhaust Hoods

2016 ◽  
Author(s):  
Derek Taylor ◽  
Gurnam Singh ◽  
Phil Hemsley ◽  
Martin Claridge
Keyword(s):  
Numerical Study ◽  
Design Guidelines ◽  
Geometric Parameters ◽  
Design Tools ◽  
Steam Turbines ◽  
Exhaust Hood ◽  
Geometric Configurations ◽  
Last Stage ◽  
Lp Turbine ◽  
The Impact

The design of an effective diffuser for a given last stage blade of an LP turbine is known to be highly dependent on the size and shape of the exhaust hood in which it is located. For retrofit steam turbines in particular, where a new last stage blade and diffuser are fitted into an existing exhaust hood, the shapes and sizes of the exhaust box have been seen to vary significantly from one contract to the next. An experimental parametric study of diffuser lips and exhaust hood configurations has been run on a model test turbine rig at GE Power to investigate the impact of various geometric parameters on the performance of the diffusers. Improved testing and post-processing methodologies means the diffuser performance has been obtained for a greater number of geometric configurations than was previously typically possible. The results of these experiments are compared with numerical calculations and confirm the accuracy of the standard in-house diffuser design tools. Key geometric parameters are identified from the test data and used to generate improved diffuser design guidelines.

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