scholarly journals Managing Risks in the Improved Model of Rolling Mill Loading: A Case Study

2021 ◽  
Vol 14 (8) ◽  
pp. 359
Author(s):  
Nelli Vladimirovna Syreyshchikova ◽  
Danil Yurievich Pimenov ◽  
Elena Nikolaevna Yaroslavova ◽  
Munish Kumar Gupta ◽  
Muhammad Aamir ◽  
...  
Keyword(s):  
Metallurgical Industry ◽  
Innovative Approach ◽  
Practical Significance ◽  
Potential Hazard ◽  
Metallurgical Enterprise ◽  
Rolling Mills ◽  
New Model ◽  
Loading Process ◽  
Improved Model ◽  
Sources Of Risks

This article reflects the main sources of risks for metallurgical enterprises in Russia, presenting the implementation of an innovative approach to increasing the competitiveness of an industrial enterprise, which is a typical representative of large enterprises of the metallurgical industry, based on the development of risk-oriented thinking when loading rolling mills with orders of intersecting assortment according to a new model. To reduce the emerging risks of a new model of the loading process of rolling mills of a metallurgical enterprise, it is proposed to take into account the risks in a complex way, taking into account their interactions with the use of integrated risk management (IRM). Practical development of the implemented approach was carried out by identifying the risks of the new improved loading process and their causes at each stage of the process. Risks were identified by analysis, qualitative and quantitative assessment of the likelihood of risks and the severity of consequences from their implementation with the establishment of events with a high potential hazard. Possible causes of hazardous events have been identified. To reduce the likelihood of unfavorable events, measures have been developed to influence significant risks and their effectiveness has been determined. The development of an innovative approach using risk-based thinking in a previously unexplored field of the application provides competitive advantages for enterprises of the metallurgical industry, increases income by reducing the cost of manufacturing products and production volumes by reducing time costs, achieving an economic efficiency of up to 10 million rubles per year. The practical significance of the dissemination of development results in similar industries is obvious and relevant for metallurgy as a whole.

USAGE OF NEAR-MISS-INCIDENTS TO ASSESS HAZARDS AT THE WORKPLACE OF WORKERS WITH DISABILITIES

2020 ◽  
pp. 111-117
Author(s):  
Karyna Danova ◽  
◽  
Viktoriia Malysheva ◽  
Keyword(s):  
Statistical Processing ◽  
Near Miss ◽  
Practical Significance ◽  
Control Group ◽  
Potential Hazard ◽  
Functional Changes ◽  
Managerial Decisions ◽  
Undesirable Event ◽  
Disability Group ◽  
Industrial Injuries

The aim of the work is to study the possibility of usage the near-miss incidents as the indicators reflecting the level of potential hazard at the workplaces of workers, in particular with stable functional changes in the state of health. This approach is of great preventive value, since it allows obtaining the information about the level of hazard even before it is realized in the form of a certain undesirable event, such as an accident or a casualty. Research methods. The information about near-miss incidents and the potential consequences of hazard realization was obtained using a questionnaire of employees with subsequent statistical processing of the results. Results. Based on the results of studies of near-miss incidents at the workplaces of various groups of workers, it was determined that disability and the severity of disabilities affect the frequency and potential severity of these incidents. In comparison with the control group of workers who did not have stable functional changes in their health, in the process of performing production tasks by workers with II disability group, near-miss incidents occurred 36% more often, and with workers of III group – by 22%. Increase of the potential severity of incidents depending on the group of disability is determined. The scientific novelty lies in the development of ways to use near-miss incidents as indicators of the level of hazard at the workplace of workers with disabilities. The practical significance lies in obtaining information about the frequency and possible severity of near-miss incidents at the workplaces of workers using the example of a metalworking workshop at the enterprise in Kharkiv. The introduction of the procedure to collect information about near-miss incidents with subsequent data processing allows forming data for making managerial decisions to improve the OSH management system at the enterprise and develop effective measures to prevent industrial injuries.

scholarly journals Improved unit hydrograph characterisation of the daily flow regime (including low flows) for the River Teifi, Wales: towards better rainfall-streamflow models for regionalisation

2002 ◽  
Vol 6 (5) ◽  
pp. 899-911 ◽  
Author(s):  
I.G. Littlewood
Keyword(s):  
Time Delay ◽  
Model Fit ◽  
Temperature Modulation ◽  
Rainfall Runoff ◽  
Unit Hydrograph ◽  
New Model ◽  
Low Flows ◽  
Starting Point ◽  
Improved Model ◽  
Pure Time Delay

Abstract. An established rainfall-streamflow modelling methodology employing a six-parameter unit hydrograph-based rainfall-runoff model structure is developed further to give an improved model-fit to daily flows for the River Teifi at Glan Teifi. It is shown that a previous model of this type for the Teifi, which (a) accounted for 85% of the variance in observed streamflow, (b) incorporated a pure time delay of one day and (c) was calibrated using a trade-off between two model-fit statistics (as recommended in the original methodology), systematically over-estimates low flows. Using that model as a starting point the combined application of a non-integer pure time delay and further adjustment of a temperature modulation parameter in the loss module, using the flow duration curve as an additional model-fit criterion, gives a much improved model-fit to low flows, while leaving the already good model-fit to higher flows essentially unchanged. The further adjustment of the temperature modulation loss module parameter in this way is much more effective at improving model-fit to low flows than the introduction of the non-integer pure time delay. The new model for the Teifi accounts for 88% of the variance in observed streamflow and performs well over the 5 percentile to 95 percentile range of flows. Issues concerning the utility and efficacy of the new model selection procedure are discussed in the context of hydrological studies, including regionalisation. Keywords: unit hydrographs, rainfall-runoff modelling, low flows, regionalisation.

An improved model of the localized electron in polar fluids

1977 ◽  
Vol 55 (11) ◽  
pp. 1937-1939 ◽  
Author(s):  
Neil R. Kestner
Keyword(s):  
Long Range ◽  
Polar Molecules ◽  
Finite Range ◽  
Polar Fluid ◽  
Solvent Interaction ◽  
New Model ◽  
Polar Fluids ◽  
Improved Model ◽  
Trapped Electron

A new model for the long range electron solvent interaction experienced by a trapped electron in a polar fluid is presented. It is an extension and modification of the work of Iguchi except that it includes a cutoff beyond which the orienting ability of the trapped electron is not strong enough to overcome other forces between the polar molecules. This potential is of finite range and supports only one bound s and p state, in contrast to the usual polaron form.

Improved Model of Metro Segment Liner Endogenetic Forces

2013 ◽  
Vol 438-439 ◽  
pp. 1028-1031
Author(s):  
Yue Yang ◽  
Xiao Guo Chen
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Research Result ◽  
Shield Tunnel ◽  
Reinforced Concrete Structure ◽  
New Model ◽  
Metro Tunnel ◽  
Improved Model ◽  
Design And Construction

Harbin metro, the first engineering is in the process of being built. Metro tunnel is supported by reinforced concrete structure. Commonly used model is used in design of shield tunnel liner. In this paper, the habitual model is improved. The joint of model of the habitual model is improved and the endogenetic force formulas for the new model are derived. At last, the derived formulas and the existing formulas are validated by Harbin first metro. According to the research result, we can know the formulas derived in the paper are credible and they have academic practical meaning for design and construction of the subway liner.

scholarly journals IMPROVED MODEL-BASED POLARIMETRIC DECOMPOSITION USING THE POlINSAR SIMILARITY PARAMETER

2016 ◽  
Vol XLI-B7 ◽  
pp. 847-850
Author(s):  
H. Latrache ◽  
M. Ouarzeddine ◽  
B. Souissi
Keyword(s):  
Urban Area ◽  
Similarity Parameter ◽  
Volume Scattering ◽  
New Approach ◽  
New Model ◽  
Decomposition Scheme ◽  
Volume Model ◽  
Model Based ◽  
Improved Model

In this paper, we present a new approach to solve the problem of volume scattering ambiguity in urban area, for that we propose a volume model based on the polarimetric interferometric similarity parameter (PISP) . The new model is more adaptive and fits better with both forest and oriented built-up areas. Thereby, a new model-based polarimetric decomposition scheme is developed. To test the performance of the proposed method ESAR PolInSAR L bande data of Oberpfaffenhofen, Germany is used. Comparison experiments show that the proposed method gives good results, since all the oriented built-up areas are well discriminated as double or odd bounce structures.

scholarly journals Research on the Innovation of the Cultivation Mode of Biology Postgraduate Students in Local Normal Universities —Take Xinyang Normal University as an Example

2020 ◽  
pp. 6-13
Author(s):  
Bo Peng ◽  
Xiao-Rui Ma ◽  
Feng Peng ◽  
Xue-Zhong Sun ◽  
Xia-Yu Tian ◽  
...  
Keyword(s):  
Postgraduate Education ◽  
Teaching Quality ◽  
Social Needs ◽  
Practical Significance ◽  
Postgraduate Students ◽  
New Model ◽  
Normal University ◽  
High Level ◽  
Normal Universities

Postgraduate education is the highest level of higher education and the cradle of training high-level professionals in China. The quality of postgraduate training is the lifeline of postgraduate education, which determines the potential of the country’s future economic and social development and the competitiveness of talents. With the continuous expansion of the national graduate enrollment scale, it is of great theoretical and practical significance for local normal universities to cultivate biological professionals to adapt to the development of life science and social needs, and to explore a new model for the cultivation of biological postgraduate professionals. In the past 14 years, the College of Life Sciences of Xinyang Normal University has been focusing on the construction of "Supervisor-Team-Discipline", focusing on improving the theoretical quality and practical ability of postgraduate students, that is, "One center, Two improvements" of the new model of training biological postgraduate students, which has important theoretical significance and potential application value for the continuous improvement of teaching quality of biological postgraduate in education.

A Mechanistic Model for Wellbore Cleanout in Horizontal and Inclined Wells

2021 ◽  
pp. 1-17
Author(s):  
Rida Elgaddafi ◽  
Ramadan Ahmed ◽  
Hamidreza Karami ◽  
Mustafa Nasser ◽  
Ibnelwaleed Hussein
Keyword(s):  
Shear Stress ◽  
Drag Coefficient ◽  
Mechanistic Model ◽  
Circulation Rate ◽  
Bed Shear Stress ◽  
New Model ◽  
Coiled Tubing ◽  
Water Based ◽  
Improved Model ◽  
The Impact

Summary The accumulation of rock cuttings, proppant, and other solid debris in the wellbore caused by inadequate cleanout remarkably impedes field operations. The cuttings removal process becomes a more challenging task as the coiled-tubing techniques are used during drilling and fracturing operations. This article presents a new hole cleaning model, which calculates the critical transport velocity (CTV) in conventional and fibrous water-based fluids. The study is aimed to establish an accurate mechanistic model for optimizing wellbore cleanout in horizontal and inclined wells. The new CTV model is established to predict the initiation of bed particle movement during cleanout operations. The model is formulated considering the impact of fiber using a special drag coefficient (i.e., fiber drag coefficient), which represents the mechanical and hydrodynamic actions of suspended fiber particles and their network. The dominant forces acting on a single bed particle are considered to develop the model. Furthermore, to enhance the precision of the model, recently developed hydraulic correlations are used to compute the average bed shear stress, which is required to determine the CTV. In horizontal and highly deviated wells, the wellbore geometry is often eccentric, resulting in the formation of flow stagnant zones that are difficult to clean. The bed shear stress in these zones is sensitive to the bed thickness. The existing wellbore cleanout models do not account for the variation in bed shear stress. Thus, their accuracy is limited when stagnant zones are formed. The new model addresses this problem by incorporating hydraulic correlations to account for bed shear stress variation with bed height. The accuracy of the new model is validated with published measurements and compared with the precision of an existing model. The use of fiber drag and bed shear stress correlations has improved model accuracy and aided in capturing the contribution of fiber in improving wellbore cleanout. As a result, for fibrous and conventional water-based fluids, the predictions of the new model have demonstrated good agreement with experimental measurements and provided better predictions than the existing model. Model predictions show a noticeable reduction in fluid circulation rate caused by the addition of a small quantity of fiber (0.04% w/w) in the fluid. In addition, results show that the existing model overpredicts the cleaning performance of both conventional and fibrous water-basedmuds.

scholarly journals An Improved Model for Chlorophyll-a Concentration Retrieval in Coastal Waters Based on UAV-Borne Hyperspectral Imagery: A Case Study in Qingdao, China

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2769
Author(s):  
Yingying Gai ◽  
Dingfeng Yu ◽  
Yan Zhou ◽  
Lei Yang ◽  
Chao Chen ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Coastal Waters ◽  
Wind Waves ◽  
Biological Indicator ◽  
Sea Surface ◽  
Sea Surface Salinity ◽  
Surface Salinity ◽  
New Model ◽  
Chl A ◽  
Improved Model

Chlorophyll-a (Chl-a) is an objective biological indicator, which reflects the nutritional status of coastal waters. However, the turbid coastal waters pose challenges to the application of existing Chl-a remote sensing models of case II waters. Based on the bio-optical models, we analyzed the suppression of coastal total suspended matter (TSM) on the Chl-a optical characteristics and developed an improved model using the imagery from a hyper-spectrometer mounted on an unmanned aerial vehicle (UAV). The new model was applied to estimate the spatiotemporal distribution of Chl-a concentration in coastal waters of Qingdao on 17 December 2018, 22 March 2019, and 20 July 2019. Compared with the previous models, the correlation coefficients (R2) of Chl-a concentrations retrieved by the new model and in situ measurements were greatly improved, proving that the new model shows a better performance in retrieving coastal Chl-a concentration. On this basis, the spatiotemporal variations of Chl-a in Qingdao coastal waters were analyzed, showing that the spatial variation is mainly related to the TSM concentration, wind waves, and aquaculture, and the temporal variation is mainly influenced by the sea surface temperature (SST), sea surface salinity (SSS), and human activities.

A Blackout Model Based on Optimal Risk Index and High-Risk Line Identification

2011 ◽  
Vol 383-390 ◽  
pp. 2390-2397
Author(s):  
Xue Yang Ding ◽  
Xin Dong Liu
Keyword(s):  
High Risk ◽  
Power System ◽  
New England ◽  
Outage Probability ◽  
Power Flow ◽  
Risk Index ◽  
Practical Significance ◽  
Outer Loop ◽  
Real Power ◽  
New Model

This paper summarizes the defects of both OPA model and its improved models and then proposes a new model in order to simulate real power system roundly. There is an inner loop based on DC power flow optimization to minimize the change in generation or load shed and an outer loop based on the risk theory. In the outer loop, whether to improve the line capacity and how to improve are determined by risk index of line improvement (RILI) and line improvement degree function, respectively. A new prevention strategy against cascading failure is proposed by identifying the high-risk lines and determining optimal RILI which minimize line improvement cost and load loss. In the end, simulation based on 39-bus New England System reveals that new model is closer to real power system than the original one by comparing outage probability and load loss between the two models, and risk-based assessment interval and line improvement delay play important roles in prevention against power system outages, and improvement based on risk assessment can reduce outage probability to varying degrees, which illustrates the practical significance of optimal RILI.

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