scholarly journals THE IMPACT OF SHEAR GAP SIZE ON THE QUALITY OF THE SHEARED SURFACE IN ELECTRICAL STEEL SHEET BLANKING

2020 ◽  
Vol 26 (2) ◽  
pp. 49-53
Author(s):  
Emil Spišák ◽  
Janka Majerníková ◽  
Ľuboš Kaščák ◽  
Peter Mulidran
Keyword(s):  
Current Knowledge ◽  
Gap Size ◽  
Technological Parameters ◽  
Cutting Surface ◽  
Shear Area ◽  
The Impact ◽  
Electrical Steel Sheet ◽  
Ferrite Grain Size ◽  
Main Material

The quality of the sheared surface when blanking, also known as die-cutting, is the result of several factors. Based on current knowledge about blanking, the following technological parameters – shear gap size, blunting of the shearing tool, lubrication in the shearing process, and deformation rate – can be considered as decisive parameters on the quality of the sheared surface. The main material characteristics include yield strength, tensile strength, ductility, and ferrite grain size. The paper is focused on the influence of the shear gap on the quality of the shear surface of electrical sheets with different chemical composition and different mechanical properties. The quality of the cutting surface was characterized by the size of the plastic cutting area. The relationships between the size of the shear gap, which ranged from 1 to 7% of the thickness of the cut material and the size of the plastic shear area, were evaluated and measured macroscopically.

scholarly journals Problems of Analyzing Microstructure Images in Assessing the Impact of Technological Parameters of Combined Strain Wave Hardening on the Quality of the Surface Layer

2019 ◽  
Author(s):  
Андрей Киричек ◽  
Andrey Kirichek ◽  
Дмитрий Соловьев ◽  
Dmitriy Solovyev ◽  
Александр Хандожко ◽  
...  
Keyword(s):  
Surface Layer ◽  
Thermal Treatment ◽  
Strain Wave ◽  
Technological Parameters ◽  
Steel Microstructure ◽  
Main Indicator ◽  
Metallographic Images ◽  
Surface Layer Quality ◽  
The Impact

The problems of analyzing metallographic images and the method of their solution using modern software for the analysis of metallographic images are described. There is given an analysis of microstructure images as the main indicator of the surface layer quality by the example of studying the research results of strain wave hardening combinations and chemical-thermal treatment, in particular the influence of previous strain wave hardening and subsequent thermal and chemical- thermal treatment on the alloy steel microstructure or previous thermal and chemical- thermal treatment and subsequent strain wave hardening. On the basis of the analysis the effectiveness of strain wave hardening and chemical and thermal treatment is established.

scholarly journals Study of the Influence of Technological Parameters on Generating Flat Part with Cylindrical Features in 3D Printing with Resin Cured by Optical Processing

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1941
Author(s):  
Aurel Tulcan ◽  
Mircea Dorin Vasilescu ◽  
Liliana Tulcan
Keyword(s):  
3D Printing ◽  
Flat Surface ◽  
Coordinate Measuring Machine ◽  
3D Printer ◽  
Light Control ◽  
Technological Parameters ◽  
Optical Processing ◽  
Measuring Machine ◽  
The Impact

The objective of this paper is to determine how the supporting structure in the DLP 3D printing process has influences on the characteristics of the flat and cylindrical surfaces. The part is printed by using the Light Control Digital (LCD) 3D printer technology. A Coordinate Measuring Machine (CMM) with contact probes is used for measuring the physical characteristics of the printed part. Two types of experiment were chosen by the authors to be made. The first part takes into consideration the influence of the density of the generated supports, at the bottom of the printed body on the characteristics of the flat surface. In parallel, it is studying the impact of support density on the dimension and quality of the surface. In the second part of the experiment, the influence of the printed supports dimension on the flatness, straightness and roundness of the printed elements were examined. It can be observed that both the numerical and dimensional optimum zones of the support structure for a prismatic element could be determined, according to two experiments carried out and the processing of the resulting data. Based on standardized data of flatness, straightness and roundness, it is possible to put in accord the values determined by measurement within the limits of standardized values.

scholarly journals Informal caregivers of patients with COPD: Home Sweet Home?

2015 ◽  
Vol 24 (137) ◽  
pp. 498-504 ◽  
Author(s):  
Nienke Nakken ◽  
Daisy J.A. Janssen ◽  
Esther H.A. van den Bogaart ◽  
Emiel F.M. Wouters ◽  
Frits M.E. Franssen ◽  
...  
Keyword(s):  
Emotional Support ◽  
Current Knowledge ◽  
Informal Caregivers ◽  
Chronic Obstructive ◽  
Subjective Burden ◽  
Obstructive Pulmonary Disease ◽  
Anxiety Depression ◽  
The Impact ◽  
Optimal Quality

The burden of chronic obstructive pulmonary disease (COPD) on society is increasing. Healthcare systems should support patients with COPD in achieving an optimal quality of life, while limiting the costs of care. As a consequence, a shift from hospital care to home care seems inevitable. Therefore, patients will have to rely to a greater extent on informal caregivers. Patients with COPD as well as their informal caregivers are confronted with multiple limitations in activities of daily living. The presence of an informal caregiver is important to provide practical help and emotional support. However, caregivers can be overprotective, which can make patients more dependent. Informal caregiving may lead to symptoms of anxiety, depression, social isolation and a changed relationship with the patient. The caregivers' subjective burden is a major determinant of the impact of caregiving. Therefore, the caregiver's perception of the patient's health is an important factor. This article reviews the current knowledge about these informal caregivers of patients with COPD, the impact of COPD on their lives and their perception of the patient's health status.

The Optimization Study about Technological Parameters of YAG Laser Precision Cutting Stainless Sheet

2013 ◽  
Vol 652-654 ◽  
pp. 2369-2373
Author(s):  
Gui Min Yin ◽  
Zhan Guo Li ◽  
Meng Li
Keyword(s):  
Output Power ◽  
Cutting Speed ◽  
Technological Parameters ◽  
Impulse Frequency ◽  
Scanning Velocity ◽  
Optimization Study ◽  
Cutting Surface ◽  
Two Factors ◽  
Single Factor Experiment

Using high power Nd3+:YAG pulse laser for precision cutting stainless sheet, study the effects of the laser cutting technological parameters on quality of cutting surface and joint-cutting width. The data of single factor experiment proved： With the increasing of scanning velocity, the joint-cutting width decreased; the width increased with the increasing of scanning velocity, laser current, impulse frequency and impulse width; the increasing of impulse frequency may improve the processing quality and ultimate cutting speed; the data of two-factors experiment proved: when the output power and impulse width are fixed, the impulse frequency will be increased, the joint-cutting width will be decreased; when the output power and impulse frequency are fixed, the impulse width will be increased, the joint-cutting width will be decreased.

Impact of onychomycosis on quality of life

1997 ◽  
Vol 87 (11) ◽  
pp. 507-511 ◽  
Author(s):  
LA Drake
Keyword(s):  
Quality Of Life ◽  
Physical Functioning ◽  
Emotional State ◽  
Current Knowledge ◽  
Medical Problem ◽  
Interpersonal Interactions ◽  
The Impact ◽  
The Relationship

The author reviews the current knowledge of the impact of onychomycosis on quality of life. Like other visible disorders of the integumentary system, onychomycosis affects many aspects of life, including physical functioning, interpersonal interactions, and emotional state. After examining the nature of quality of life and the study instruments used to measure it, the author reviews several studies that have examined the relationship between onychomycosis and quality of life. The author concludes that onychomycosis is a significant medical problem that has a great impact on patients' lives and should therefore be treated as definitively as possible.

scholarly journals Cancer and Aging: Two Tightly Interconnected Biological Processes

Cancers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1400
Author(s):  
Lieze Berben ◽  
Giuseppe Floris ◽  
Hans Wildiers ◽  
Sigrid Hatse
Keyword(s):  
Older Patients ◽  
Current Knowledge ◽  
Geriatric Oncology ◽  
Individual Treatment ◽  
Treatment Regimens ◽  
Patients With Cancer ◽  
Increased Risk ◽  
The Impact

Age is one of the main risk factors of cancer; several biological changes linked with the aging process can explain this. As our population is progressively aging, the proportion of older patients with cancer is increasing significantly. Due to the heterogeneity of general health and functional status amongst older persons, treatment of cancer is a major challenge in this vulnerable population. Older patients often experience more side effects of anticancer treatments. Over-treatment should be avoided to ensure an optimal quality of life. On the other hand, under-treatment due to fear of toxicity is a frequent problem and can lead to an increased risk of relapse and worse survival. There is a delicate balance between benefits of therapy and risk of toxicity. Robust biomarkers that reflect the body’s biological age may aid in outlining optimal individual treatment regimens for older patients with cancer. In particular, the impact of age on systemic immunity and the tumor immune infiltrate should be considered, given the expanding role of immunotherapy in cancer treatment. In this review, we summarize current knowledge concerning the mechanistic connections between aging and cancer, as well as aging biomarkers that could be helpful in the field of geriatric oncology.

scholarly journals The Influence of Sand Grains Properties on Electrical Properties of Moulding Sand with Inorganic Binder

2015 ◽  
Vol 15 (3) ◽  
pp. 43-46 ◽  
Author(s):  
B. Opyd ◽  
K. Granat
Keyword(s):  
Electrical Properties ◽  
Loss Factor ◽  
Water Glass ◽  
Basic Research ◽  
Technological Parameters ◽  
Effectiveness And Efficiency ◽  
Main Component ◽  
The Impact ◽  
Kinetics Of

Abstract The paper presents the results of basic research on the influence of the properties of sand grains on electrical properties of water glass moulding sands. It shows electrical properties of the main component – sand grains, crucial to the kinetics of moulding sands heating, such as permittivity εr and loss factor tgδ. Measurements were carried out with the use of the perturbation method for silica, chromite and olivine sands of different mineral, chemical composition and particle size distribution, as well as for moulding sands with water glass grade 145. Analysis of the results of measurements of electrical properties shows that all moulding sands are characterized by a similar permittivity εr and loss factor tgδ. It was found that the electrical properties and the quantity and quality of other components may have a decisive influence on the effectiveness and efficiency of the microwave heating of moulding sands with sand grains. In determining the ability to efficiently absorb the microwave radiation for mixtures which moulding sands are, the impact of all components influencing their individual technological parameters should be taken into account.

scholarly journals Increasing the life of plunger and barrel assembly of high pressure fuel pumps

2021 ◽  
Vol 282 ◽  
pp. 07023
Author(s):  
M.N. Salikhova ◽  
V.A. Aleksandrov ◽  
V.S. Kukhar ◽  
I.P. Galchak ◽  
A.M. Chudinov
Keyword(s):  
High Pressure ◽  
Radial Force ◽  
Theoretical Studies ◽  
Specific Pressure ◽  
Technological Parameters ◽  
Subsequent Performance ◽  
Plunger Pair ◽  
Operating Modes ◽  
The Impact

In order to identify the regularities of further increasing the efficiency of transport and technological machines, it is of interest to consider the issues of determining the impact of their design and technological parameters on the quality of running-in and the operability of fuel pumps. The article analyzes the influence of the initial operating modes and the lubricating medium on the quality of running-in and subsequent performance of high-pressure fuel pumps. On the basis of theoretical studies, equations were obtained to determine the unbalanced radial force acting on the plunger and fuel leaks in the plunger pair. These expressions make it possible to establish the dependence of the specific pressure in the plunger and barrel assembly both on the design and technological parameters of the pump.

scholarly journals The impact of migration on body weight: a review

2015 ◽  
Vol 31 (2) ◽  
pp. 229-245 ◽  
Author(s):  
Beatriz Goulão ◽  
Osvaldo Santos ◽  
Isabel do Carmo
Keyword(s):  
Social Factors ◽  
Current Knowledge ◽  
African Immigrants ◽  
Positive Association ◽  
Future Studies ◽  
Concept Definition ◽  
Immigration Process ◽  
Underlying Causes ◽  
The Impact

Immigrants may be more vulnerable to obesity as a result of the immigration process. The aim of this article is to summarize current knowledge about the impact of immigration on body mass index (BMI). A systematic review was performed in accordance with PRISMA guidelines through a database search of scientific articles (last updated in August 2014). Thirty-nine articles were included and assessed. Results varied according to ethnic background, country of origin and host country. A consistent positive association between BMI and time since immigration was found among Hispanic, European and African immigrants. Less than half of the studies observed a positive association among Asian immigrants. The quality of the majority of the studies assessed was poor, reflecting a need to improve methodology and concept definition. Immigration appears to have a deteriorative effect on BMI. Underlying causes may include changes in nutrition and physical activity, psychological and social factors, and genetic susceptibility and these aspects should be included as moderator variables in future studies.

scholarly journals Change of Pressing Chamber Conicalness at Briquetting Process in Briquetting Machine Pressing Chamber

10.14311/1554 ◽  
2012 ◽  
Vol 52 (3) ◽  
Author(s):  
Peter Križan ◽  
Miloš Matúš ◽  
Jaan Kers ◽  
Djordje Vukelić
Keyword(s):  
Theoretical Analysis ◽  
Structural Parameters ◽  
Structural Parameter ◽  
Technological Parameters ◽  
Conical Shape ◽  
Experimental Findings ◽  
The Impact

In this paper, we will present the impact of the conical shape of a pressing chamber, an important structural parameter. Besides the known impact of the technological parameters of pressing chambers, it is also very important to pay attention to their structural parameters. In the introduction, we present a theoretical analysis of pressing chamber conicalness. An experiment aimed at detecting this impact was performed at our institute, and it showed that increasing the conicalness of a pressing chamber improves the quality of the final briquettes. The conicalness of the pressing chamber has a significanteffect on the final briquette quality and on the construction of briquetting machines. The experimental findings presented here show the importance of this parameter in the briquetting process.

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