scholarly journals Spindle Error Movements and Their Measurement

2021 ◽  
Vol 11 (10) ◽  
pp. 4571
Author(s):  
Jarosław Chrzanowski ◽  
Tadeusz Sałaciński ◽  
Paweł Skiba
Keyword(s):  
Machine Tool ◽  
Research Methods ◽  
Machine Tools ◽  
Research Work ◽  
Current State ◽  
Cutting Machine ◽  
The Impact

The spindle of a machine tool is an important component of the machine. Its condition affects not only operation of the machine tool but also, above all, the quality of the workpiece. This paper explains the terminology and describes the research methods used to measure the spindle error movements of cutting machine tools. This article explains the impact of spindle motion inaccuracies on the quality of workpieces, quotes the requirements of European and American standards, and describes the current state and directions of development of the presented methods. Our own research work in this field is also presented.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

The Development of Agritourism in the Podkarpackie Voivodeship in the Light of International and National Conditions

2017 ◽  
Vol 13 ◽  
pp. 244-261
Author(s):  
Mariola Tracz ◽  
Małgorzata Bajgier-Kowalska ◽  
Radosław Uliszak
Keyword(s):  
Development Strategy ◽  
Current State ◽  
Central Statistical ◽  
Central Statistical Office ◽  
Tourism Resources ◽  
The One ◽  
The Impact ◽  
District Offices ◽  
Socio Economic Factors

Podkarpackie Voivodeship is one of the regions of Poland in which the number of agritourism entities is very high. Therefore tourism plays a significant role in its development strategy. The aim of the paper is to identify the current state of agritourism and the changes that have occurred in the region in the years 2000–2016. Specific objectives are to determine the distribution of agritourism farms and their offer, together with a comprehensive analysis of the environmental and socio-economic factors, as well as the impact of the Slovak-Ukrainian border. The report was developed on the statistical materials from the Polish Central Statistical Office, Podkarpackie Agricultural Advisory Centre in Boguchwała and data collected from municipalities and district offices that is published on their websites, as well as through interviews with 100 owners of agritourism farms in the Podkarpackie Voivodeship. The research has shown, on the one hand, the decline in the number of farms in the region and, on the other hand, the increase in the diversity of the tourist offer of these entities. Distribution of agritourism farms is closely linked to the attractiveness of natural environment and quality of secondary tourism resources. Traditional agritourism has not yet fully used its countryside, as well as cross-border advantages of its location.

scholarly journals Smoothing additive manufactured parts using ns-pulsed laser radiation

2021 ◽  
Author(s):  
Florian Kuisat ◽  
Fernando Lasagni ◽  
Andrés Fabián Lasagni
Keyword(s):  
Surface Roughness ◽  
Mechanical Performance ◽  
State Of The Art ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Laser Source ◽  
Pulsed Laser Radiation ◽  
Current State ◽  
The Impact

AbstractIt is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.

scholarly journals PENGEMBANGAN SOSIS GASUHIRU BERBASIS PANGAN LOKAL IKAN GABUS “TOKOK” DAN TEPUNG KOMPOSIT TERHADAP SIFAT ORGANOLEPTIK, KADAR ZAT GIZI DAN DAYA TERIMA SOSIS GASUHIRU.

2019 ◽  
Vol 4 (1) ◽  
pp. 24
Author(s):  
Dwi Khotimah ◽  
Abdul Salam ◽  
AASP Chandradewi ◽  
Irianto Irianto
Keyword(s):  
Physical Growth ◽  
Composite Flour ◽  
Treatment Comparison ◽  
Tukey Test ◽  
Current State ◽  
Trust Level ◽  
The Difference ◽  
The Impact ◽  
One Way Anova

Background. Nutrition less in infants is a health problem around the world especially the countries develop. In Indonesia nutritional problems less in toddlers about 19.6%. Nutritional problems have little effect on the low quality of human resources, especially the impact of toddlers who are malnourished by poor brain development, unoptimal physical growth, and metabolic developments (the Kemenkes RI, 2014). The current state of nutrition especially in children is still ematitiate. Given the impact of the nutrient less widespread, it is necessary to do a handling of PMT in the form of sausages using local food that is effective in increasing the weight of children with less nutritional nutrition.Metodelogi. In this study used experimental research Desan with a complete random draft (RAL) One treatment comparison of cork fish with composite flour 75%: 25% 80%: 20% 85%: 15%. Data processing. Processing of data obtained from observations presented in the form of tables, to find out the nature of organoleptic (aroma, flavor, texture and color) in each addition of the sausage making materials processed and analyzed using a statistical analysis of One Way Anova at a trust level of 95% (A = 0.05). If there is a significant impact, the data is analyzed further using the Tukey test to see which treatment is causing the difference. Research results. The comparison of cork fish and composite flour is significant effect on the taste color of texture and aroma. The PMT of Gasuhiru sausage contains 262KKL and 16.72 gr of protein in 100gr. Gasuhiru sausage receiving 83.3% well received.Conclusion: The most liked sausage is a comparison of 85%: 15%. The administration of PMT provides a significant effect on children's weight loss and is 3 times greater than the Conntrol group.

scholarly journals The impact of COVID-19 pandemic on the quality of life

2021 ◽  
Vol 129 ◽  
pp. 01029
Author(s):  
Zuzana Stofkova ◽  
Peter Seemann
Keyword(s):  
Quality Of Life ◽  
Local Governments ◽  
National Level ◽  
Value Added ◽  
Subjective Quality ◽  
Life Assessment ◽  
Subjective Quality Of Life ◽  
Current State ◽  
The Impact

Research background: The paper deals with the quality of life and the impact of the pandemic COVID-19 on people’s lives in Slovakia and in selected region. The concept of quality of life and dimensions of quality of life, which are necessary for its evaluation are mentioned, too. It also describes the current state of the issue in Slovakia and abroad on the basis of the selected indicators, where individual countries of the world are compared. Purpose of the article: There are mentioned approaches to quality of life assessment and to conduct a survey of quality of life in a selected region which deals with the development of the quality of life. The paper deals with the analysis of the current state of the problem in Slovakia and abroad. Various definitions of the term quality of life through several authors and views. Methods: Indices in a global and national level for assessment of selected aspects of objective and subjective quality of life in terms of pandemics COVID-19 are mentioned. In order to assess the impact of a pandemic related to COVID-19 on satisfaction of citizens with several aspects of their lives in selected region is analyzed on the basis of an e-survey. Findings & Value added: The result of the article is a comparison of individual indicators of the subjective quality of life in selected EU member states and the Slovak Republic. A survey of the satisfaction of the inhabitants of selected region with selected areas of quality of their lives connected with the COVID-19 pandemic is carried out in order to monitor and evaluate the quality of life at the level of local governments.

scholarly journals Assessment of the Quality of Soil and Groundwater of the Agricultural Area of Sidi Yahya Region, Morocco

2020 ◽  
Vol 150 ◽  
pp. 01001
Author(s):  
M. Lahmar ◽  
N. El Khodrani ◽  
S. Omrania ◽  
H. Dakak ◽  
R. Moussadek ◽  
...  
Keyword(s):  
Water Table ◽  
Land Management ◽  
Research Work ◽  
Sustainable Use ◽  
Soil Samples ◽  
Agricultural Area ◽  
Soil Parameters ◽  
The Impact ◽  
Soil And Water

The Gharb plain is the largest agricultural area in Morocco. It is characterized by fertile soils and the availability of water either from surface or groundwater which allowed intensive agriculture. The aim of this research work is to study the impact of this land management on the quality of water and soil. The study was done for the irrigated perimeter of Sidi Yahya belonging to the province of Sidi Slimane, Gharb (Morocco). Depth of water table and water pH were measured in situ while water and soil samples were collected and brought to the laboratory for their physico-chemical analyses. Sampling of 33water wells and soil samples, from six different zones, was done between May and October 2018. Analysis of variance (ANOVA) was used to check if mean water and soil parameters differed between zones. The results showed that the minimal and maximal water table depth were 6 and 96 m, respectively. Also, slightly more than half of the wells (51.5%) were inadequate for irrigation since they were either highly or extremely saline. Furthermore, soils were poor to moderately poor in organic matter but very rich in potassium and the phosphorus content was highly variable. Based on the statistical analysis, it is clear that the six zones had significantly different means for CaCO3, pH, OM, and exchangeable sodium percentage. Soil degradation like pollution and salinization may occur in this region if poor quality water is used for irrigation and if land is mismanaged. This research work can be considered as a first step towards a program for monitoring the quality of soil and water for adapting the land management with the final objective of securing high productivity and sustainable use of soil and water resources.

scholarly journals Water Retention in Nature-Based Solutions—Assessment of Potential Economic Effects for Local Social Groups

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3347
Author(s):  
Zwoździak Jerzy ◽  
Szałata Łukasz ◽  
Zwoździak Anna ◽  
Kwiecińska Kornelia ◽  
Byelyayev Maksym
Keyword(s):  
Climate Change ◽  
Water Retention ◽  
Economic Effect ◽  
Social Groups ◽  
Economic Effects ◽  
Operating Costs ◽  
Current State ◽  
The Impact

The upcoming trends related to climate change are increasing the level of interest of social groups in solutions for the implementation and the realization of activities that will ensure the change of these trends and can reduce the impact on the environment, including the health of the community exposed to these impacts. The implementation of solutions aimed at improving the quality of the environment requires taking into account not only the environmental aspects but also the economic aspect. Taking into account the analysis of solutions changing the current state of climate change, the article focuses on the analysis of the potential economic effect caused by the implementation of nature-based solutions (NBSs) in terms of reducing the operating costs related to water retention for local social groups. The analysis is based on a case study, one of the research projects studying nature-based solutions, created as part of the Grow Green project (H2020) in Wrocław in 2017–2022. The results of the analysis are an observed potential positive change in economic effects, i.e., approximately 85.90% of the operating costs related to water retention have been reduced for local social groups by NBSs.

scholarly journals Impact of Structural Defects on the Surface Quality of Hardwood Species Sliced Veneers

2020 ◽  
Vol 10 (18) ◽  
pp. 6265
Author(s):  
Vasiliki Kamperidou ◽  
Efstratios Aidinidis ◽  
Ioannis Barboutis
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Wood Species ◽  
Research Work ◽  
Structural Defects ◽  
Material Surface ◽  
Typical Structure ◽  
Hardwood Species ◽  
The Impact

The surface roughness constitutes one of the most critical properties of wood and wood veneers for their extended utilization, affecting the bonding ability of the veneers with one another in the manufacturing of wood composites, the finishing, coating and preservation processes, and the appearance and texture of the material surface. In this research work, logs of five significant European hardwood species (oak, chestnut, ash, poplar, cherry) of Balkan origin were sliced into decorative veneers. Their surface roughness was examined by applying a stylus tracing method, on typical wood structure areas of each wood species, as well as around the areas of wood defects (knots, decay, annual rings irregularities, etc.), to compare them and assess the impact of the defects on the surface quality of veneers. The chestnut veneers presented the smoothest surfaces, while ash veneers, despite the higher density, recorded the highest roughness. In most of the cases, the roughness was found to be significantly lower around the defects, compared to the typical structure surfaces, probably due to lower porosity, higher density and the presence of tensile wood. The results reveal that the presence of defects does not affect the roughness of the veneers and increases neither the processing requirements of the veneer sheets before finishing, nor the respective production cost of veneers and the veneer-based wood panels. The high utilization prospects of the examined wood species in veneer production, even those bearing various defects, is highlighted.

scholarly journals Status of our Science

2017 ◽  
Author(s):  
Matt Motyl ◽  
Alexander Pantelis Demos ◽  
Timothy S Carsel ◽  
Brittany Elyse Hanson ◽  
JP Prims ◽  
...  
Keyword(s):  
Current Debate ◽  
Scientific Quality ◽  
Great Length ◽  
Research Practices ◽  
Personality Psychology ◽  
Positive Direction ◽  
Questionable Research Practices ◽  
Current State ◽  
The Impact

The scientific quality of social and personality psychology has been debated at great length in recent years. Despite research on the prevalence of questionable research practices (QRPs) and the replicability of particular findings, the impact of the current discussion on research practices is unknown. The current studies examine whether and how practices have changed, if at all, over the last 10 years. In Study 1, we surveyed 1,166 social and personality psychologists about how the current debate has affected their perceptions of their own and the field’s research practices. In Study 2, we coded the research practices and critical test statistics from social and personality psychology articles published in 2003-2004 and 2013-2014. Together, these studies suggest that (1) perceptions of the current state of the field are more pessimistic than optimistic; (2) the discussion has increased researchers’ intentions to avoid QRPs and adopt proposed best practices, (3) the estimated replicability of research published in 2003-2004 may not be as bad as many feared, and (4) research published in 2013-2014 shows some improvement over research published in 2003-2004, a result that suggests the field is evolving in a positive direction.

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