Methods to improve hackles in the production of quality yarn

Farxot Kazakov; Izzatulla Rajabov; Jamshidjon Umirov; Dilafruz Ruziyeva; Aziza Aripova

doi:10.1088/1742-6596/2094/4/042091

Methods to improve hackles in the production of quality yarn

Journal of Physics Conference Series ◽

10.1088/1742-6596/2094/4/042091 ◽

2021 ◽

Vol 2094 (4) ◽

pp. 042091

Author(s):

Farxot Kazakov ◽

Izzatulla Rajabov ◽

Jamshidjon Umirov ◽

Dilafruz Ruziyeva ◽

Aziza Aripova

Keyword(s):

Fiber Layer ◽

Traction Forces ◽

Modes Of Operation ◽

Technical Parameters

Abstract The article covers the analysis of work members and mechanisms of hackles, substantiation of technical parameters and modes of operation in order to improve the quality of yarn, to eliminate thread irregularities, to reduce thread breakage and defects by changing the hackling segments and supply table spacing. The work members of the hackles, the traction forces of the roving and the hackle, as well as the productivity of the machine are theoretically determined. The hackling level indicates the thickness of the fiber layer on the surface of the main drum, or how many fibers fit into a single headset tooth. By varying the spacing between the receiving drum and the supply table, the fibers are better hackled, the degree of hackling increases - the higher the quality of the hackle and the effect on the quality of the roving has been determined theoretically and experimentally.

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Teledermatology in Times of COVID-19 Confinement: Comparing Patients’ and Physicians’ Satisfaction by the Standardized Brest Teledermatology Questionnaire

Dermatology ◽

10.1159/000514029 ◽

2021 ◽

pp. 1-6

Author(s):

Joachim W. Fluhr ◽

Annie Gueguen ◽

Delphine Legoupil ◽

Emilie Brenaut ◽

Claire Abasq ◽

...

Keyword(s):

Main Question ◽

Chronic Patients ◽

Dermatology Department ◽

Global Satisfaction ◽

Technical Parameters ◽

Face To Face ◽

Almost All ◽

Outpatient Settings

The French government imposed the first COVID-19 pandemic lockdown from March 17 until May 11, 2020. Only emergency cases and teledermatology (TD) were allowed in outpatient settings. A standardized questionnaire was developed to compare the satisfaction level of patients and their treating physicians. Our main question was whether the patients would perceive TD as a valid alternative for direct physical face-to-face consultation. Eighty-two patients and their 4 treating dermatologists from one dermatology department participated in the study (43 females, 39 males) with a mean age of 46.6 years (SD ±23.9). The reason for TD was a chronic disease in the majority (87.8%), and mainly as a follow-up (96.3%). Regarding satisfaction, almost all categories rated around 9 on a 0–10 verbal analogue scale. The same level of global satisfaction could be seen between the patients and the physicians as well as for the quality of the patient-physician relation and whether all questions could be addressed during the TC. Physicians showed significantly higher scores than patients only for the category of “length” of the consultation. Gender, age, as well as distance between the clinic and home of the patient were not influencing factors for satisfaction. Regarding the technical parameters, the evaluation was mostly comparable for patients and physicians, but overall lower than the relational satisfaction parameters, especially for image quality. Patients were significantly more motivated to continue the TD after the lockdown than their treating dermatologists. We see an interest for implementing TD in specialized centers with chronic patients coming from remote places for regular follow-ups. TD cannot replace in-person patient-physician interaction, but was helpful during the lockdown. As a result, TD might become part of dermatology training to prepare for future lockdown situations.

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Analysis of the Characteristics of External Walls of Wooden Prefab Cross Laminated Timber

Energies ◽

10.3390/en13225974 ◽

2020 ◽

Vol 13 (22) ◽

pp. 5974

Author(s):

Jozef Švajlenka ◽

Mária Kozlovská ◽

Miroslav Badida ◽

Marek Moravec ◽

Tibor Dzuro ◽

...

Keyword(s):

Experimental Measurements ◽

Internal Environment ◽

Acoustic Parameters ◽

Cross Laminated Timber ◽

Technical Parameters ◽

Heat Flows ◽

Laboratory Conditions ◽

Technical Properties ◽

Structural Parts

A balanced combination of heat flows creates suitable conditions for thermal comfort—a factor contributing to the quality of the internal environment of buildings. The presented analysis of selected thermal-technical parameters is up-to-date and suitable for verifying the parameters of building constructions. The research also applied a methodology for examining the acoustic parameters of structural parts of buildings in laboratory conditions. In this research, selected variant solutions of perimeter walls based on prefab cross laminated timber were investigated in terms of acoustic and thermal-technical properties. The variants structures were investigated in laboratory but also in model conditions. The results of the analyses show significant differences between the theoretical or declared parameters and the values measured in laboratory conditions. The deviations of experimental measurements from the calculated or declared parameters were not as significant for variant B as they were for variant A. These findings show that for these analyzed sandwich structures based on wood, it is not always possible to reliably declare calculated values of thermal-technical and acoustic parameters. It is necessary to thoroughly examine such design variants, which would contribute to the knowledge in this field of research of construction systems based on wood.

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The Experimental and Numerical Analysis of Stress as a Tool for Optimizing the Selected Structural Components of an Injection Device

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.816.482 ◽

2015 ◽

Vol 816 ◽

pp. 482-489

Author(s):

Peter Sivák ◽

Oskar Ostertag

Keyword(s):

Numerical Analysis ◽

Service Life ◽

Structural Components ◽

Injection Device ◽

Paper Briefly ◽

Technical Parameters ◽

Structural Parts ◽

The Individual ◽

Important Basis

The improvement of the main monitored technical parameters of the production devices is connected with the optimization of the individual structural components and construction nodes of these devices. Mainly those critical structural nodes of the devices that have a significant impact on the quality of the products manufactured by this device and its service life are studied. This paper briefly presents the results of experimental and numerical analysis of stresses and strains of selected structural components of the injection device, such as the connecting and guiding columns and the adjustable push plate. The relevant analyses of stresses and strains have been connected with the performance of a series of experimental and computer simulations. The results of these simulations then became an important basis for further optimization of selected structural parts of the injection device.

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Traction control and diagnostics of electric and unmanned vehicles on roller stands

E3S Web of Conferences ◽

10.1051/e3sconf/202015701021 ◽

2020 ◽

Vol 157 ◽

pp. 01021

Author(s):

Alexander Fedotov ◽

Oleg Yankov ◽

Anton Chernyshkov

Keyword(s):

Electric Vehicles ◽

Technical Condition ◽

Test Methods ◽

Unmanned Vehicles ◽

Kinematic Parameters ◽

Modes Of Operation ◽

Traction Control ◽

Wheeled Vehicles

The authors of the article analyze the possibilities of correct diagnostics of unmanned and electric vehicles on modern power and inertia roller stands. The purpose of this work is to improve the quality of monitoring the technical condition of wheeled vehicles by providing highly informative and stable test modes of operation in the process of their diagnostics. To achieve this target, we have developed test methods for wheeled vehicles, the implementation of which it is proposed to use a hybrid designed stand allows to measure force and power to the drive wheels of the vehicle, and temporal and kinematic parameters of the process of its functioning. The study proved that, to ensure a highly stable and test modes of operation of wheeled vehicles in the process of control of technical condition and diagnosis, you should use hybrid stands.

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Technical parameters of high speed lines as the determinant for selection of rolling stock

MATEC Web of Conferences ◽

10.1051/matecconf/201818006007 ◽

2018 ◽

Vol 180 ◽

pp. 06007

Author(s):

Jan Raczyński

Keyword(s):

High Speed ◽

Point Of View ◽

Rolling Stock ◽

High Speed Rail ◽

Technical Parameters ◽

Rail Vehicle ◽

Railway Infrastructure ◽

The One ◽

Selection Of

Choosing a high-speed rail vehicle depends on many factors. On the one hand, there are requirements for ensuring the quality of service for passengers, on the other hand, there are constraints resulting from the parameters of available infrastructure. Also a relation of the benefit and financial costs associated with the purchase and the operation of rolling stock is essential. Technical characteristics of vehicles selected for operating a particular system is a compromise between the three groups of requirements. In this article technical parameters of railway infrastructure and rolling stock are classified and then analysed from the TSI requirements point of view.

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Exposure Levels of Adult Patients during Radiographic Examinations: Sinuses and Coastal Grill Cases at the Ngaoundere Regional Hospital, Cameroon

Radiology Research and Practice ◽

10.1155/2019/5452149 ◽

2019 ◽

Vol 2019 ◽

pp. 1-5

Author(s):

Guiswe Gnowe ◽

Fouda H. P. Ekobena ◽

Amvene J. Mbo ◽

Guena M. Neossi

Keyword(s):

Regional Hospital ◽

Adult Patients ◽

Radiological Protection ◽

Radiographic Image ◽

Technical Parameters ◽

Exposure Levels ◽

Skin Doses ◽

Dosimetric Analysis ◽

Very High

Background. The purpose of this study was to estimate the doses delivered to adult patients during explorations of the sinuses and coastal grill whose attention in dosimetric terms is neglected because of the low demand for diagnosis. But yet dosimetric values are very high.Materials and Methods. The present study was transversely descriptive and was conducted between April and July 2016. The data were collected on 50 adult patients of mass of 70±10kg at the Regional Hospital of Ngaoundere (HRN). The dose at the entrance of the patients' skin was evaluated through the theoretical methods derived from the Davies model according to the 75th percentile calculations.Results and Discussion. The entrance skin doses obtained in mGy were, respectively, of 7.2±0.2 for sinuses and 5.27±0.1 for coastal grill. The present study found many variations in doses during radiological investigations. These variations allowed us to understand that the notions of quality of the radiographic image, insurance, and quality control of the radiological equipment are tributary, abstract, and often theoretical because doses delivered are not sufficiently optimized.Conclusion. The dosimetric analysis remains very worrying because the various procedures show that an improvement of the practices especially with respect to the technical parameters and the protocols must be considered. Therefore a strengthening of radiological protection skills of radiological manipulators (continuing education and retraining) would contribute to a better protection of patients.

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The impact of technical parameters on the perception quality of three-dimensional content

ACTA GRAPHICA Journal for Printing Science and Graphic Communications ◽

10.25027/agj2017.28.v29i4.168 ◽

2020 ◽

Vol 29 (4) ◽

pp. 13-18

Author(s):

Fabijan Nushi ◽

◽

Vladimir Cviljušac ◽

Lidija Mandić ◽

◽

...

Keyword(s):

Three Dimensional ◽

Technical Parameters ◽

The Impact

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Numerical Simulation Analysis of the Cold Bending Forming Technology Based on DEFORM

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.490-495.3353 ◽

2012 ◽

Vol 490-495 ◽

pp. 3353-3357 ◽

Cited By ~ 1

Author(s):

Xiao Bing Xu ◽

Hong Run Luo

Keyword(s):

Simulation Analysis ◽

Pipe Production ◽

State Variables ◽

Technical Parameters ◽

Forming Technology ◽

Cold Bending ◽

Bent Pipe ◽

Deformation Speed ◽

3D Software

In this paper, the accurate numerical simulations using the DEFORM-3D software are carried out in terms of the cold bending pipe technology. Correspondingly, the changes of state variables are gained, such as the stress, the strain, the material deformation speed, the damage severity and so on. Meanwhile, the important technical parameters concerned with the quality of pipe bending formation like the speed of the punch press, the friction coefficient and the friction types are comprehensively analyzed. Thus, it can be realized in practice to control and optimize the quality of the bent pipe production

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SPACE AND ITS USE FOR PEDESTRIAN TRAFFIC IN CENTER AREAS OF SELECTED POLISH CITIES

Zeszyty Naukowe Uniwersytetu Gdańskiego Ekonomika Transportu i Logistyka ◽

10.5604/01.3001.0010.5778 ◽

2017 ◽

Vol 67 (0) ◽

pp. 45-52

Author(s):

Katarzyna Nosal ◽

Łukasz Franek ◽

Sylwia Rogala

Keyword(s):

Public Space ◽

Urban Space ◽

City Center ◽

Technical Parameters ◽

The Public ◽

Pedestrian Traffic ◽

Street Furniture ◽

Pedestrian Infrastructure ◽

The City

The quality of urban space in terms of walkability can be assessed taking many parameters into account, such as the presence of sidewalks, their density and continuity, appropriate technical parameters as well as the presence of greenery, squares, parks, which create the environment for pedestrian traffic. The lack of travel barriers, the possibility to shorten the route, travel safety and security, the presence of street furniture, shops and services are also significant. This article concerns some of the above described factors and presents selected research results on the use of space in city centers of several Polish cities – Kraków, Gdańsk, Szczecin, Warsaw, Gdynia, Wrocław and Poznań as well as the results of an analysis on the friendliness of this space for pedestrian traffic. The first phase of this study was to determine the share of public space within the analyzed city center areas, and then define areas used as roads, infrastructure for pedestrians and cyclists, squares, green areas, parks and public courtyards. The balance of the used space was created for each researched area, and the space dedicated to pedestrian traffic was additionally analyzed in terms of the presence of obstacles as well as sidewalk location. The analysis results prove that that greatest amount of the public space is located in the city center of Poznań, and the smallest in Kraków. Warsaw is characterized by the greatest and Szczecin by the smallest percentage of the pedestrian infrastructure. Szczecin dominates in terms of the share of roads in the downtown area, Wrocław in terms of squares and Gdańsk – public courtyards.

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