scholarly journals Assesment Work Fatigue To Workers In Environment Underground Mining Areas Based On Fatigue Assesment Scale Questionnaires

2020 ◽  
Vol 202 ◽  
pp. 05013
Author(s):  
Siti Rachmawati ◽  
Miftaqul Aktsari ◽  
Anis Suryaningsih ◽  
Hashfi Hawali Abdul Matin ◽  
Iwan Suryadi
Keyword(s):  
Rating Scale ◽  
Underground Mining ◽  
Sleep Time ◽  
Type Ii ◽  
Work Time ◽  
Fatigue Assessment ◽  
Mining Areas ◽  
Hours Of Work ◽  
Fatigue Evaluation ◽  
Descriptive Method

Fatigue is recognized as a high potential risk for accidents and therefore an assessment of work fatigue is required. The purpose of this study is to describe the overall work fatigue assessment and based on work fatigue factors using questionnaires for the fatigue rating scale for workers in underground mining areas. This study used a descriptive method to describe the overall assessment of work fatigue and assessment of work fatigue based on factors related to fatigue using questionnaire scale fatigue assessment of workers in underground mining areas at PT. Y. Overall fatigue assessment based on fatigue evaluation questionnaire results obtained 54.55% of workers who experience fatigue. Fatigue assessment based on factors related to work fatigue shows that workers who tend to experience fatigue are> 45 years of age, <7 hours of sleep,> 5 years of work, 12 hours of work, supervisor type II / jumbo operator drill, jumbo drill operator, LHD operator, and service crew / helper jumbo drill, work climate> NAB (> 29.00 C) and noise> NAB (> 85 dB A). Underground mining workers tend to experience fatigue. The older the worker's age, the less sleep time, the longer the work period, the longer work time, the heavier the type of work, the hotter the working climate and the noisier it tends to experience fatigue.

scholarly journals Analisis Faktor yang Berpengaruh terhadap Kelelahan Kerja pada Pekerja Rambut Palsu di CV. Dona Mandiri Cabang Lasiana Kota Kupang

2019 ◽  
Vol 1 (4) ◽  
pp. 127-139
Author(s):  
Nadi Rispiandi Hauteas ◽  
Luh Putu Ruliati ◽  
Soni Doke
Keyword(s):  
Sleep Quality ◽  
Statistical Tests ◽  
Linear Regression Analysis ◽  
Total Sample ◽  
Work Time ◽  
Cross Sectional ◽  
Work Factors ◽  
Hours Of Work ◽  
Temperature Variable ◽  
Work Environment Factors

Work fatigue is one of the health problems that is often felt by workers, characterized by a decrease in efficiency and endurance at work. Many factors can affect the occurrence of work fatigue, that is worker factors, work factors and work environment factors. The specific purpose of this research is to analyze the influence of work period, sleep quality, breakfast habits, long hours of work and work room temperature on work fatigue of wig workers in CV. Dona Mandiri Kupang City Lasiana Branch. This type of research is analytic survey research and uses cross sectional research design. This research was conducted at CV. Dona Mandiri, Lasiana Branch, Kupang City, in July-August 2019. The populations in this study were all wig workers working at CV. Dona Mandiri Lasiana Branch in Kupang City, with a total sample of research using a total population of 61 respondents. Statistical tests using is simple linear regression analysis. Based on the results of the study, the significance and effect of working period shows (0.896 and 0.000); sleep quality (0.080 and 0.051); breakfast habits (0.001); work time (0.014) and temperature shows (0.003). It show that the variable working time does not have an effect on work fatigue, sleep quality variables does not have an effect on work fatigue, breakfast habits have an effect on work fatigue, the length of work variable has an effect on work fatigue and the temperature variable has an effect on work fatigue.

scholarly journals NUMERICAL MODELLING FOR UNDERGROUND MINING RELATED GEOTECHNICAL ISSUES

2013 ◽  
Vol 35 (3) ◽  
pp. 13-24
Author(s):  
L. Florkowska
Keyword(s):  
Numerical Modeling ◽  
Numerical Modelling ◽  
Continuous Monitoring ◽  
Underground Mining ◽  
Mining Areas ◽  
Geotechnical Problems ◽  
Mathematical And Numerical Modeling

Abstract Issues presented in this work relate to geotechnical problems that are specific to the mining areas. The paper discusses the methodology of mathematical and numerical modeling of these problems. Examples contained in the paper include: predicting the influence of mining exploitation on a detached building and evaluating the effectiveness of the building protection with the trench. Possible applications of numerical modeling as a tool to aid the continuous monitoring of the building state during the exploitation have also been discussed

scholarly journals Taxes, Social Subsidies, and the Allocation of Work Time

2011 ◽  
Vol 3 (4) ◽  
pp. 1-26 ◽  
Author(s):  
L. Rachel Ngai ◽  
Christopher A Pissarides
Keyword(s):  
Welfare Policy ◽  
Oecd Countries ◽  
Work Time ◽  
Policy Effects ◽  
Industrial Sectors ◽  
Hours Of Work

We examine the allocation of hours of work across industrial sectors in OECD countries. We find large disparities across three sector groups, one that produces goods without home substitutes, and two others that have home substitutes but are treated differently by welfare policy. We attribute the disparities to the countries' tax and subsidy policies. High taxation substantially reduces hours in sectors that have close home substitutes but less so in other sectors. Subsidies increase hours in the subsidized sectors that have home substitutes. We compute these policy effects for 19 OECD countries. (JEL H24, H31, J22)

Tracking the Land Use/Land Cover Change in an Area with Underground Mining and Reforestation via Continuous Landsat Classification

2019 ◽  
Vol 11 (14) ◽  
pp. 1719 ◽  
Author(s):  
Jiaxin Mi ◽  
Yongjun Yang ◽  
Shaoliang Zhang ◽  
Shi An ◽  
Huping Hou ◽  
...  
Keyword(s):  
Land Use ◽  
Random Forest ◽  
Land Cover ◽  
Large Scale ◽  
Underground Mining ◽  
Mining Area ◽  
Random Forest Classifier ◽  
Land Use Land Cover ◽  
Lulc Change ◽  
Mining Areas

Understanding the changes in a land use/land cover (LULC) is important for environmental assessment and land management. However, tracking the dynamic of LULC has proved difficult, especially in large-scale underground mining areas with extensive LULC heterogeneity and a history of multiple disturbances. Additional research related to the methods in this field is still needed. In this study, we tracked the LULC change in the Nanjiao mining area, Shanxi Province, China between 1987 and 2017 via random forest classifier and continuous Landsat imagery, where years of underground mining and reforestation projects have occurred. We applied a Savitzky–Golay filter and a normalized difference vegetation index (NDVI)-based approach to detect the temporal and spatial change, respectively. The accuracy assessment shows that the random forest classifier has a good performance in this heterogeneous area, with an accuracy ranging from 81.92% to 86.6%, which is also higher than that via support vector machine (SVM), neural network (NN), and maximum likelihood (ML) algorithm. LULC classification results reveal that cultivated forest in the mining area increased significantly after 2004, while the spatial extent of natural forest, buildings, and farmland decreased significantly after 2007. The areas where vegetation was significantly reduced were mainly because of the transformation from natural forest and shrubs into grasslands and bare lands, respectively, whereas the areas with an obvious increase in NDVI were mainly because of the conversion from grasslands and buildings into cultivated forest, especially when villages were abandoned after mining subsidence. A partial correlation analysis demonstrated that the extent of LULC change was significantly related to coal production and reforestation, which indicated the effects of underground mining and reforestation projects on LULC changes. This study suggests that continuous Landsat classification via random forest classifier could be effective in monitoring the long-term dynamics of LULC changes, and provide crucial information and data for the understanding of the driving forces of LULC change, environmental impact assessment, and ecological protection planning in large-scale mining areas.

High-rate GNSS positioning for tracing anthropogenic seismic activity

2020 ◽  
Author(s):  
Iwona Kudłacik ◽  
Jan Kapłon ◽  
Grzegorz Lizurek ◽  
Mattia Crespi ◽  
Grzegorz Kurpiński
Keyword(s):  
Seismic Activity ◽  
Underground Mining ◽  
High Rate ◽  
Anthropogenic Activity ◽  
Mining Areas ◽  
Seismological Data ◽  
Band Pass ◽  
Mining Tremors ◽  
Natural Earthquakes ◽  
First Time

&lt;p&gt;High-rate GNSS observations are usually related to earthquake analysis and structural monitoring. The sampling frequency is in the range of 1-100 Hz and observations are processed in the kinematic mode. Most of the research on short-term dynamic deformations is limited to natural earthquakes with magnitudes exceeding 5 and amplitudes of at least several centimetres up to even meters. The high frequency GNSS stations positions monitoring is particularly important on mining areas due to the mining damages. On the underground mining areas the seismic tremors are regular and there are several hundreds of events annually of magnitude over 2 with maximum magnitudes of 4. As mining tremors are shallow and very frequent, they cause mining damages on infrastructure.&lt;/p&gt;&lt;p&gt;Here, we presented the application of GNSS-seismology to the analysis of anthropogenic seismic activity, where the event magnitude and amplitude of displacements significantly lower. We examined the capacity to detect mining tremors with high-rate GPS observations and demonstrated, for the first time to our knowledge that even subcentimeter ground vibrations caused by anthropogenic activity can be measured this way with a very good agreement with seismological data. One of the most-felt mining shocks in Poland in recent years occurred on January 29, 2019 (12:53:44 UTC) M3.7 event in the area of Legnica-G&amp;#322;og&amp;#243;w Copper District and was successfully registered by high-rate GNSS stations co-located with seismic stations. In this mining tremor the peak ground displacements reached 2-16 &amp;#160;mm and show the Pearson&amp;#8217;s correlation value in range of 0.61 to 0.94 for band-pass filtered horizontal displacements.&lt;/p&gt;

scholarly journals Slope ranking and geohazards correlation analysis for combined open-underground mining area

2018 ◽  
Author(s):  
Zhang Jin
Keyword(s):  
Correlation Analysis ◽  
Water Conservation ◽  
Laser Scanning ◽  
Underground Mining ◽  
Mining Area ◽  
Open Pit ◽  
Ground Subsidence ◽  
Data Sets ◽  
Mining Areas ◽  
Factor Data

Geohazards in mining areas are mainly ground subsidence, slope landslides and ground cracks, surface cover degradation and environmental ecological pattern destruction. The classification and rank of terrain slope and the feature area extraction of the slope are the important content for the correlation analysis with the geohazards. The slope classification and rank index system for soil and water conservation, land use and man-made ground disasters was analyzed. According to the characteristics of open pit and underground associated mining area, we comprehensively analyzed the spatial correlation between different ground disaster and terrain features and landform types, and propose a new slope ranking index, dividing slope zones and forming slope classification map. Especially slope area of 35-45 degrees and more than 45 degrees was extracted, and the relationship between regional geohazards and slope zone was analyzed. The application of terrestrial laser scanning technology to establish open-pit high precision digital elevation model, extraction of slope, slope type, gully density characteristic factor, topography factor data sets are established, and correlation analysis, to enhance disaster information content.

scholarly journals InSAR monitoring surface deformation induced by underground mining using Sentinel-1 images

2020 ◽  
Vol 382 ◽  
pp. 237-240
Author(s):  
Ling Zhang ◽  
Daqing Ge ◽  
Xiaofang Guo ◽  
Bin Liu ◽  
Man Li ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Surface Deformation ◽  
Underground Mining ◽  
Deformation Gradient ◽  
Mining Area ◽  
Interferometric Synthetic Aperture Radar ◽  
Mining Areas ◽  
Temporal Decorrelation ◽  
Land Deformation ◽  
Small Baseline

Abstract. Land subsidence can be caused by underground mining activities. Interferometric Synthetic Aperture Radar (InSAR) has became an economic, effective and accurate technique for land deformation survey and monitoring. In mining areas, there may be several factors to overcome for the succsessful application of InSAR, such as temporal decorrelation and detectable deformation gradient, that limit the ability of InSAR to monitoring rapid land subsidence. In this paper, images obtained by the Sentinel-1 satellite with 6 or 12 d revisiting time are used to improve the ability to detect a deformation gradient, and reduce the influence of temporal decorrelation. By combining Small Baseline Subsets (SBAS) and Interferometric Point Target Analysis (IPTA) methods, using the Nanhu mining area in Tangshan as an example, the spatial continuous results of land subsidence in this mining area are obtained with a 70 cm per year maximum rate, which clearly characterizes the deformation field and its deformation process. The results show that InSAR is a useful way to monitor land subsidence in a mining area and provides further data for environment mine restoration.

scholarly journals CASE STUDY OF PRIMITIVE REFLEXES IMPACT ON SWIMMING SKILL ACQUISITION BY HEALTHY CHILDREN

2020 ◽  
Vol 6 ◽  
pp. 89
Author(s):  
Irina Bogdanoviča ◽  
Viesturs Lāriņš
Keyword(s):  
Skill Acquisition ◽  
Rating Scale ◽  
Healthy Children ◽  
Skills Acquisition ◽  
Primitive Reflexes ◽  
Point Rating Scale ◽  
Level 1 ◽  
Descriptive Method ◽  
Tonic Neck Reflex

Primitive reflexes is an automatic muscle reactions which are only present in the first few months, but can remain active in healthy children, thus, impacting on motor proficiency. There is little evidence how primitive reflexes influence on swimming skills acquisition by healthy children. The aim of the study is to examine how primitive reflexes influence swimming skills acquisition by healthy children. Subjects: two 7-year-old girls. Methods: Checklists by Oh et al., (2011) were used to evaluate swimming skill proficiency at swimming lesson 8 and 16. The results were represented as a percentage of the possible maximal score. The testing of the asymmetrical tonic neck reflex, the symmetrical tonic neck reflex, and the tonic labyrinthine reflex was done using Blythe’s, 5-point rating scale. The analysis was carried out using descriptive method. The first girl showed two reflexes at level 1, while the second girl demonstrated all tested reflexes at level 1, 2 and 3. The girl with less total score of reflexes (8%) achieved a better level of swimming proficiency  (from 73% to 77%) than the girl with higher  (25%) severity of these reflex (from 21% to 33%.). The obteined data evidence about influence of primitive  reflexes  on  swimming skill acquisition by healthy children.  

Development of Fatigue Assessment Method Based on Flaw Tolerance Concept

2013 ◽  
Author(s):  
Seiji Asada ◽  
Takeda Shuhei ◽  
Taiji Hirasawa ◽  
Toshiyuki Saito ◽  
Itaru Saito ◽  
...  
Keyword(s):  
Power Generation ◽  
Nuclear Power ◽  
Evaluation Method ◽  
Assessment Method ◽  
Fatigue Assessment ◽  
Nondestructive Examination ◽  
Flaw Tolerance ◽  
Fatigue Evaluation ◽  
Tolerance Method ◽  
Operating Plant

The Japan Society of Mechanical Engineers (JSME) Committee on Power Generation Facility Codes recognizes the importance of fatigue evaluation methods based on the latest knowledge and is developing a fatigue evaluation method by flaw tolerance. The ASME B&PV Code Section XI has Non-mandatory Appendix L, “Operating Plant Fatigue Assessment” (hereinafter “App. L”), which provides a flaw tolerance method for fatigue evaluation when a cumulative usage factor (CUF) of a component is greater than 1.0. In order to develop a flaw tolerance method for the JSME Codes for nuclear power generation facilities, postulated initial flaws, capability of nondestructive examination, compatibility to rules and flaw tolerance codes are discussed.

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