scholarly journals Evaluation of diagnostic thresholds dependability for tribologic signals received in the environment disturbed by vibroacoustic and functional signals

2015 ◽  
Vol 36 (1) ◽  
pp. 17-32
Author(s):  
Paweł Lindstedt ◽  
Marek Zboiński ◽  
Maciej Deliś ◽  
Jerzy Manerowski
Keyword(s):  
Working Conditions ◽  
Operation Time ◽  
Working Environment ◽  
Cauchy Product ◽  
Diagnostic Thresholds ◽  
Diagnostic Threshold ◽  
Complete Set ◽  
The Relationship ◽  
Insufficient Number

Abstract Determination of dependable diagnostic thresholds for tribologic signals received e.g. from antifriction bearings (in particular for insufficient number of measurements, only 4÷5) is a really difficult task due to complexity of working environment where such bearings are operated. Typical working environment for such objects must take account for operation time under various working conditions and accompanying (and disturbing) signals, e.g. vibroacoustic ones. The sought assessment of the relationship between diagnostic signals and environmental noise can be determined from convolution of both diagnostic and environments signals that make up the complete set of received information. The convolution of these two series of signals can be obtained from an algorithm based on the Cauchy product. Then one has to find the coherence factor and the square of amplitude gain for the set of diagnostic signals with reference to various sets of signals received from environment, which makes it possible to evaluate cohesion of the investigated series of signals, thus their suitability to determine diagnostic threshold for tribologic signals intended for the analysis.

scholarly journals The Role of the Polish Interdepartmental Commission for the Maximum Admissible Concentrations and Intensities for Agents Harmful to Health in the Working Environment in the Development of Safe Working Conditions

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Skowron J ◽  
◽  
Zapór L ◽  
Miranowicz-Dzierzawska K ◽  
◽  
...  
Keyword(s):  
Working Conditions ◽  
Health And Safety ◽  
Working Environment ◽  
The European Union ◽  
Maximum Admissible Concentration ◽  
Management Measures ◽  
The Relationship ◽  
Interdepartmental Commission ◽  
Safe Working

The article discusses the principles of determining the maximum admissible concentration and intensity values for harmful agents present at workplaces as the basic criteria for ensuring safe and hygienic working conditions in Poland and in the European Union. The role of the Interdepartmental Commission for the Maximum Admissible Concentrations and Intensities of Agents Harmful to Health in the Working Environment is presented in this process. The attention was drawn to the relationship between the occupational health and safety legislation and the EC regulations on chemicals, which together provide both employers and the Member States with the necessary data and instruments to work safely with chemicals and to be able to take appropriate actions and risk management measures.

scholarly journals Associations between working environment and weight control efforts among workers with obesity in Korea

2018 ◽  
Vol 46 (6) ◽  
pp. 2307-2316 ◽  
Author(s):  
Hye Sun Hyun ◽  
Yunyoung Kim
Keyword(s):  
Working Conditions ◽  
Weight Control ◽  
Workplace Health Promotion ◽  
Working Hours ◽  
Working Environment ◽  
Multivariable Logistic Regression Analysis ◽  
Personal Factors ◽  
Regular Employment ◽  
Individual Variables ◽  
The Relationship

Objective The aim of this study was to investigate the relationship between working environment and weight control efforts among obese workers in Korea. Methods This study was based on the 2011 3rd Korean Working Conditions Survey, which was conducted on workers aged 15 years or older. A sample of 484 obese workers was included in the study. Multivariable logistic regression analysis was used to investigate the relationship between working environment and weight control efforts after controlling for individual variables. Adjusted odds ratios (ORs) and 95% confidence intervals were calculated. Results Of the participants, 63.4% reported that they made efforts to control their weight. After controlling for personal factors, the OR of weight control efforts for individuals working 40–49 hours per week was 2.4 times that for individuals working 60 hours or more per week. The OR of regular employment workers was 2.2 times that of non-regular workers. Conclusion We established that working hours and employment type were significantly related to weight control efforts. Therefore, we recommend that working conditions should be considered in designing effective workplace health promotion programs.

PROGNOSTIC SIGNIFICANCE OF SPECIFIC PROTEINS OF PREGNANCY IN WOMEN WITH A UTERINE AT SCAR AND PLACENTA ACCRETA

2020 ◽  
Vol 65 (6) ◽  
pp. 353-357
Author(s):  
Vladimir Anatolyevich Borovkov ◽  
M. B. Igitova ◽  
Y. V. Korenovskiy ◽  
Yu. A. Dudareva
Keyword(s):  
Pregnant Women ◽  
Placenta Accreta ◽  
Screening Program ◽  
Protein A ◽  
Prognostic Significance ◽  
Pregnancy Proteins ◽  
Diagnostic Thresholds ◽  
Diagnostic Threshold ◽  
Specific Proteins

Comparative analysis of serum concentrations of chorionic gonadotropin (hCG) associated with the pregnancy of plasma protein A (PAPP-A) and alpha-fetoprotein (AFP), based on the results of a survey of women as part of a standard screening program (the results were expressed as a MoM - multiply of the median), found a significant increase in the performance of all the studied specific pregnancy proteins in women with a scar on the uterus and placenta acctera (75 patients) compared with the data of the group of pregnant women without scar on the uterus and without abnormalities of attachment of the placenta (150 women). AFP indices were 1.68 ± 0.76 and 1.19 ± 0.43 MoM (p = 0.0018), hCG - 1.62 ± 1.48 and 1.23 ± 0.76 MoM (p = 0, 0112), PAPP-A - 1.93 ± 1.24 and 1.23 ± 0.67 MoM (p <0.0001). Using the ROC analysis, the diagnostic thresholds for the concentrations of AFP, hCG and PAPP-A were calculated. The risk of placenta accreta in women with a scar on the uterus in cases of exceeding the diagnostic threshold of AFP concentration (1.64 MoM) increased 2.5 times (RR = 2.5; 95% CI 1.17-5.36, p = 0, 0185), hCG (1.41 MoM) - 1.6 times (RR = 1.59; 95% CI 1.09-2.32, p = 0.0147), PAPP-A (1.41 MoM) - 2.65 times (RR = 2.65; 95% CI 1.76-3.99, p <0.0001). Determination of the level of specific pregnancy proteins can be used in the system of complex prediction of placental growth in pregnant women with a scar on the uterus as an addition to the assessment of clinical and anamnestic risk factors.

An Experimental Investigation of the Feasibility of “Self-Sensing” Shape Memory Alloy Based Actuators

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
K. Malukhin ◽  
K. F. Ehmann
Keyword(s):  
Shape Memory ◽  
Working Conditions ◽  
Voltage Drop ◽  
The Self ◽  
Order System ◽  
System Response ◽  
Crystallographic Structure ◽  
The Relationship ◽  
Insulation Condition

Shape memory alloys (SMAs) change their crystallographic structure and shape during heating/cooling and, as a consequence, their electrical resistance also changes. This allows the determination of the location of a SMA-based structure in space without separate sensors by suitably measuring this change. In this paper, this “self-sensing” concept is explored in SMA wire-type actuators. Step responses, expressed in terms of resistance (voltage drop) across the wire, and the corresponding displacement changes during heating/cooling, were measured. It was shown that the relationship between the displacement and the voltage drop can be approximated by a linear regression with a correlation coefficient close to 1. System identification has shown that SMA wire actuator performance can be best approximated by first or by second order system response depending on the thermal insulation condition of the actuator. The resolution and the sensitivity of the self-sensing method were evaluated based on experimental data and it was shown that their minimal values were less than 1.7μm and 0.7μm, respectively, thus supporting the feasibility of the “self-sensing concept.” Both values exponentially increase with the increase in the range of the measured displacements whose magnitudes vary under different working conditions.

scholarly journals GENERAL ANALYSIS OF STRESS AND DEFORMATION OF PARTS MOVING WITH HIGH VELOCITY IN A LIQUID OR GAS (REVIEW ARTICLE)

2021 ◽  
pp. 71-76
Author(s):  
Mykola Prokopenko
Keyword(s):  
Working Conditions ◽  
Thermal Fatigue ◽  
Uniaxial Stress ◽  
Material Strength ◽  
High Speeds ◽  
Analytical Review ◽  
Stress And Deformation ◽  
The Relationship

The article provides an analytical review and analysis of stresses and deformations of parts moving at high speeds in a liquid or gas. The working conditions of materials and parts of turbines (blades, rotor and casing) operating at high temperatures and loads are analyzed. The main ways of solving the problem of ensuring the strength of such parts are presented. The main ways to solve the problem of reliability of parts or the product as a whole are given: mathematical modeling (calculated determination of strength, durability and reliability); physical modeling (model testing); testing of full-scale products in reproducible real or operational conditions.It is impossible to speak about the strength of a part only from the calculation of deformations and stresses, even taking into account their change over time, so it is necessary to have strength criteria that establish the relationship between the strength parameters. It is emphasized that in the general case, the criterion of strength should answer the question: will the part collapse or not with the known laws of change in time of stresses, strains and temperatures It is shown that the considered standard characteristics of creep and long-term strength can be directly used in calculations only for those parts in which the uniaxial stress state at constant stresses and temperature is realized, when the working conditions of the material fully meet the test conditions of materials.An analytical view of deformation diagrams is considered as the main means of carrying out practical calculations of material strength. It is shown that in order to determine the stresses and strains in parts that move at high speeds in a liquid or gas, it is necessary to take into account the model of parts exploitation, the processes of creep and thermal fatigue of the material, and the unsteadiness of load processes. Keywords: stresses and deformations of turbine parts; deformation diagram; operating model of turbine parts; creep and thermal fatigue; nonstationarity of loading processes  

scholarly journals Impact of selected parameters on the loading process with cutting screw heads

2019 ◽  
Vol 2 (1) ◽  
pp. 249-256
Author(s):  
Tomasz Wydro
Keyword(s):  
Working Conditions ◽  
Cutting Process ◽  
Kinematic Parameters ◽  
Loading Process ◽  
Cutting Machine ◽  
Auxiliary Process ◽  
The Relationship

Abstract The article presents the influence of selected constructional and kinematic parameters of cutting screw heads on the loading process. The loading process is often referred to as an auxiliary process, because in the entire operation of the head the cutting process is considered dominant. Proper determination of the relationship between the cutting process and the loading process allows to understand how individual constructional and kinematic parameters of cutting heads and the cutting machine on which they are installed have an impact on each other. This knowledge gives potential users an opportunity to determine a reason for the lack of effective loading in the working conditions of a given wall. Besides construction and kinematic parameters, shielded loaders also have an impact on the loading process. The use of a shielded loader allows for improving the efficiency of the loading process, i.e. increasing the percentage of output loaded in the whole of the output transferred by the head.

scholarly journals THE TASK OF POSITIONING THE WORKING MECHANISMS CRM WITH A GPS INTENSIFIER

2021 ◽  
Vol 1 (92) ◽  
pp. 80
Author(s):  
Oleksandr Yefymenko ◽  
Tetiana Pluhina
Keyword(s):  
Coordinate System ◽  
Working Environment ◽  
Limited Time ◽  
Adaptation Algorithm ◽  
Working Mechanism ◽  
3 Dimensional ◽  
Wiener Filters ◽  
The Relationship ◽  
Working Mechanisms

The study of the task of positioning the working mechanisms of construction and road machines (CRM) of using GPS intensifier was carried out. The analysis of existing researches and publications, in which the main problem is highlighted, namely that the task of positioning the working mechanisms CRM at this time is not enough. As a result of the analysis the purpose of research is set, namely: to increase of functioning efficiency mechanisms CRM with working environment using mathematical models and adaptation algorithm in a limited time decision. The task of monitoring parameters using Kalman or Wiener filters which to take machine vibrations into account, deviations in working operations, changes in weight, etc. have been substantiated. The use of a GPS intensifier makes it possible to predict the work of actuators CRM in real time. The result of the research is algorithm of positioning the working mechanisms CRM: determination of the location of the base CRM in a 3-dimensional coordinate system; filtering measurements; predicting the position of the working mechanism. The originality lies in the fact that the using Kalman or Wiener filters allows to describe the trajectory in the coordinate system of the base machine in accordance with the point measurement, and describe the relationship between changed coordinates, which makes it possible to model and predict the workflow.

scholarly journals Ergonomics and Efficiency in a New Attempt to Model Work Processes

2020 ◽  
Vol 3 (1) ◽  
pp. 645-656
Author(s):  
Patrycja Kabiesz ◽  
Joanna Bartnicka
Keyword(s):  
Working Conditions ◽  
Video Recording ◽  
Working Environment ◽  
Work Processes ◽  
Work Process ◽  
Main Method ◽  
Operational Activities ◽  
Technical Solutions ◽  
Production Company ◽  
The Relationship

AbstractThe article presents the relationships between ergonomics and the effectiveness of work processes. A new thematic framework has been developed to evaluate the engineering design of work processes in conjunction with the effectiveness and ergonomics of workplaces. The model presented in the paper takes into account ergonomic factors that have a direct impact on shaping working environment in which a person is located and improving their efficiency. The model was validated in real conditions in the production company. The subject of the research was the work process existing in the plant producing food paper packaging. The main method used to assess working conditions was observation and qualitative and quantitative assessment of operational activities based on video recording. Detailed human actions were analyzed in terms of ergonomic factors to prove the relationship between ergonomics and efficiency. In addition, new technical solutions have been proposed that improve working conditions and the efficiency of the entire work process.

scholarly journals Unfitness to Plead, Insanity and the Law Commission: Do We Need a Diagnostic Threshold?

2021 ◽  
pp. 002201832199543
Author(s):  
James Mason
Keyword(s):  
Mental Condition ◽  
Critical Examination ◽  
Diagnostic Thresholds ◽  
Diagnostic Threshold ◽  
Explicit Reference ◽  
Cast Doubt ◽  
The Law ◽  
Diagnostic Criterion ◽  
The Relationship ◽  
Law Commission

This article examines one aspect of the new test of effective participation at trial proposed by the Law Commission of England and Wales. This proposal aims to replace the current criteria for fitness to plead originating from Pritchard and developed more recently in M (John). Specifically, this article offers a critical examination of the Commission’s refusal to incorporate a so-called ‘diagnostic threshold’ within their proposed test. After reviewing the arguments for and against this decision, attention is drawn to the clear presence of diagnostic thresholds within other areas of law, such as the mental condition defence of insanity. Overall, the Commission’s proposals are a vast improvement upon the archaic rules of present day, and, contrary to the views of some scholars, their decision to omit a diagnostic criterion is no exception to this. In fact, the implications of this decision reach far beyond the particular context of unfitness proceedings and ultimately cast doubt on the significance of diagnostic thresholds in all areas of law. By focusing exclusively on the relationship between unfitness to plead and the defence of insanity, this piece demonstrates how both tests can be reformulated so as to avoid any explicit reference to a diagnostic criterion.

Thromboplastin Related Differences in the Determination of International Normalised Ratio: A Cause for Concern?

1994 ◽  
Vol 72 (03) ◽  
pp. 426-429 ◽  
Author(s):  
S Kitchen ◽  
I D Walker ◽  
T A L Woods ◽  
F E Preston
Keyword(s):  
Patient Management ◽  
External Quality Assessment ◽  
Oral Anticoagulant Therapy ◽  
Warfarin Dosage ◽  
External Quality ◽  
External Quality Assessment Scheme ◽  
International Normalised Ratio ◽  
The Uk ◽  
The Relationship

SummaryWhen the International Normalised Ratio (INR) is used for control of oral anticoagulant therapy the same result should be obtained irrespective of the laboratory reagent used. However, in the UK National External Quality Assessment Scheme (NEQAS) for Blood Coagulation INRs determined using different reagents have been significantly different.For 18 NEQAS samples Manchester Reagent (MR) was associated with significantly lower INRs than those obtained using Diagen Activated (DA, p = 0.0004) or Instrumentation Laboratory PT-Fib HS (IL, p = 0.0001). Mean INRs for this group were 3.15, 3.61, and 3.65 for MR, DA, and IL respectively. For 61 fresh samples from warfarin-ised patients with INRs of greater than 3.0 the relationship between thromboplastins in respect of INR was similar to that observed for NEQAS data. Thus INRs obtained with MR were significantly lower than with DA or IL (p <0.0001). Mean INRs for this group were 4.01, 4.40, and 4.59 for MR, DA, and IL respectively.We conclude that the differences between INRs measured with the thromboplastins studied here are sufficiently great to influence patient management through warfarin dosage schedules, particularly in the upper therapeutic range of INR. There is clearly a need to address the issues responsible for the observed discrepancies.

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