scholarly journals Effect of Operating Factors on Reliability of Stoping Complexes and Assessment of Reliability of their Elements

2019 ◽  
Vol 4 (2) ◽  
pp. 79-89
Author(s):  
V. A. Troinich ◽  
A. A. Dubovsky ◽  
N. A. Vysotskaya
Keyword(s):  
Recovery Time ◽  
Cumulative Effect ◽  
Average Recovery ◽  
Mean Time Between Failures ◽  
Face Length ◽  
The Face ◽  
Linear Sections ◽  
Electric Cables ◽  
Face Complex ◽  
Complex Length

For analyzing the dependence of face equipment failure on its length, two groups of elements are commonly considered. The first group includes all elements of shearer-loaders: conveyor drives, elements of pumping stations of powered supports, supports of face junctions with strikes and others. The second group includes all elements of powered support sections, linear sections of pan lines and scrapers of face scraper conveyors, electric cables of shearer-loaders, main pipelines of powered supports, etc. It is noted that the constancy of number of the first group elements linear variability of number of the second group elements do not uniquely determine the constancy or variability of the failure factor of the aggregate of the same type elements of the first or the second groups [1]. The plot of mean-time-between-failures (MTBF) of SL-500S stoping complex as function of face length is presented. Besides, the curve of the face (complex) length-dependence of average recovery) time (after failure of the SL-500S stoping complex time is shown. Analyzing the dependence of availability factor of stoping complexes on the face length showed that the length of stoping complexes is not a factor determining decrease in the MTBF and increase in the average recovery time. The plot of recovery time (after failure) of the SL-500S stoping complex as function of face length is shown. A formula is presented for assessing the cumulative effect, on the MTBF of SL500S stoping complex, of its length and potash ore cuttability. The plot of correlation between the MTBF of SL500S stoping complex and the face length/the potash ore cuttability is presented, which demonstrates that the complex length followed by the thickness of the extracted layer produce the greatest effect on the MTBF. The plot of the number of failures per day as a function of the maintenance factor of the SL-500C shearer-loader is presented. The plot demonstrates that the average number of failures of the SL-500C shearer-loader per day reaches a minimum and practically stabilize at values of the maintenance factor of 0.9–1.0, which correspond to three-shift production with one 6-hour maintenance shift per day.

Characterisation of Spiti Horses of India

2004 ◽  
Vol 34 ◽  
pp. 75-81 ◽  
Author(s):  
R.K. Pundir
Keyword(s):  
High Altitude ◽  
Breeding Season ◽  
Body Length ◽  
Himachal Pradesh ◽  
The Body ◽  
Intensive Management ◽  
Alpine Pasture ◽  
Service Period ◽  
Face Length ◽  
The Face

SummaryThe breeding tract of Spiti horses is located in the Kaja subdivision of the Lahul and Spiti district and the Yanthang area of the Kinnaur district of Himachal Pradesh in India. The horses in this area are smaller in height and called Spiti ponies. They are reared as pack animals at high altitude. Their body is well developed with fairly strong bones. The mane is long and has hairs of 25 to 40 cm in length. The body is solid, displaying and alert attitude, the face is convex, the ears are erect and the eyes are black. The tail is medium in length and straight. The horses are docile in temperament. The body colours are grey, brown, black and piebald. On an average, these horses stand 129 cm height, have a body length of 100 cm, a heart girth of 148 cm, an ear length of 15 cm and a face length of 50 cm. Animals are reared on grazing (alpine pasture) from May to November and stall fed from December to April. The breeding season is from February to July. The average age at first fertile service, age at first foaling, gestation period, service period and foaling interval were estimated as 1 054, 1 297, 333, 63 and 516 days, respectively under intensive management at Kamand farm. It has also been ascertained from various sources that their number is declining rapidly, however breed population statistics are not available. There is, therefore, an urgent need to conserve this breed.

scholarly journals Clinical Treatment of Elderly Patients with Chronic Atrial Fibrillation and Heart Failure

2015 ◽  
Vol 4 (1) ◽  
pp. 8
Author(s):  
Haifeng Liu
Keyword(s):  
Heart Failure ◽  
Atrial Fibrillation ◽  
Treatment Group ◽  
Elderly Patients ◽  
Recovery Time ◽  
Chronic Atrial Fibrillation ◽  
Clinical Treatment ◽  
Neurosecretory System ◽  
Control Group ◽  
Average Recovery

<strong>Objective: </strong>To study the clinical treatment of chronic atrial fibrillation and heart failure in elderly patients. <strong>Method: </strong>In our hospital, 120 patients with chronic atrial fibrillation complicated with heart failure were selected from March 2011 to March 2014 as the study subject. The clinical treatment of chronic atrial fibrillation with heart failure was discussed by comparing with the control group and the treatment group. <strong>Results: </strong>After 1 months of treatment, the total effective rate was 90% in the treatment group and 70% in the control group, the average recovery time of the treatment group was (4.45 + 0.88) day, and the average recovery time of the control group was (7.76 + 1.34) day. <strong>Conclusion: </strong>To improve cardiac function and ventricular remodeling, heart rate control, blocking neurosecretory system in the treatment for elderly patients with chronic atrial fibrillation and heart failure patients affect significantly, has very important clinical value.

The Wear and Drag Prediction of the 2D Micro-Asperities on Textured Wall

2011 ◽  
Vol 284-286 ◽  
pp. 1489-1492
Author(s):  
Moussa Magara Traore ◽  
Li Wang
Keyword(s):  
Numerical Simulation ◽  
Shear Stress ◽  
Flow Characteristics ◽  
Flow Simulation ◽  
Flow Speed ◽  
Wear Area ◽  
Face Length ◽  
The Face ◽  
Drag Prediction ◽  
Flow Pressure

This study presents a numerical simulation, using the flow simulation of solidworks 2010; the results showed the flow speed trajectory, the variation of the shear stress and the flow pressure on different faces of the micro-asperities in relation with the face length. The simulation was done in steady state and with the no- slips condition in contact with the upper surface. The flow characteristics were found also with different flow speed. The turbulence area due to the micro-asperity geometry is localized. The flow characteristics (variation of shear stress and flow pressure) are analyzed for the prediction of the maximum wear area due to the skin friction or drag.

Research on Adaptive Strategy of Web Services

2014 ◽  
Vol 536-537 ◽  
pp. 662-667
Author(s):  
Zhi Peng Lei ◽  
Hang Ping Qiu ◽  
Ya Ning WU ◽  
Zhi Cai YANG
Keyword(s):  
Information Systems ◽  
Web Services ◽  
Recovery Time ◽  
Adaptive Strategy ◽  
Evaluation Methods ◽  
Electronic Information ◽  
Average Recovery ◽  
Composite Services ◽  
The Web

With the aim at resolving the failure problems of Web-Services-Based electronic information systems, which are caused by web services' failure, we propose a QoS model and evaluation methods of web services collaborated with LAN. On that basis, we design a composite adaptive strategy. This strategy uses the reliability of the web services to assist the selection, and uses the web services backup set to achieve a quick fix. The analysis of feasibility shows that this strategy can obviously reduce the failure ratio and the average recovery time of the composite services.

Study on Surface Subsidence and Separation Range Thick Seam Mining of Daping Mine

2013 ◽  
Vol 742 ◽  
pp. 268-271 ◽  
Author(s):  
Meng Lin Xu ◽  
Xun Guo Zhu ◽  
De Shen Zhao
Keyword(s):  
Surface Subsidence ◽  
Thick Seam ◽  
Working Face ◽  
Single Face ◽  
High Efficient ◽  
Mining Conditions ◽  
Face Length ◽  
The Face ◽  
Residual Space ◽  
Seam Mining

In order to study the surface subsidence and separation range features during the mining process in in thick seam mining of Daping mine , it takes the typical coal of mining in S2S9 face of Daping Mine, using the resemble simulation to study on it. The study showed that the subsidence amounted to less than the maximum under the geological and mining conditions, In the single-face mining conditions, when the face length is generally not more than (1/3-1/4) H.The mining thickness cannot deflection in the form completely transmitted to the surface, but abound in overburden bed rock mass formed within the fracture and caving into the residual space. This research can be a reference for safety and high efficient coal mining of other working face in Daping Coal Mine.

Tissue Modification in Nonsurgical Facelift Options

2020 ◽  
Vol 36 (06) ◽  
pp. 688-695
Author(s):  
Lucas M. Harrison ◽  
Ryan Shapiro ◽  
R Michael Johnson
Keyword(s):  
Conformational Change ◽  
Lower Risk ◽  
Recovery Time ◽  
Mechanisms Of Action ◽  
Heterogeneous Group ◽  
Facial Rejuvenation ◽  
Operative Techniques ◽  
The Face ◽  
Effective Use

AbstractNonsurgical facelifts are a term for a heterogeneous group of procedures used by physicians to improve facial rejuvenation without the use of operative techniques. Patients demand these services due to the reduced recovery time and generally lower risk. However, nonsurgical techniques, to be effective, must induce conformational change in the cells and tissues of the face. Therefore, these techniques are significant procedures that have associated risks. Understanding the tissue modifications and mechanisms of action of these techniques is vital to their safe and effective use. The purpose of this article is to provide a background of tissue modification in nonsurgical facelift options.

scholarly journals An Influence Study of Face Length Effect on Floor Stability under Water-Rock Coupling Action

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Baojie Fu ◽  
Bo Wang
Keyword(s):  
Rock Mass ◽  
Coal Seam ◽  
Mine Pressure ◽  
Length Effect ◽  
Pressure Relief ◽  
Limestone Aquifer ◽  
Study Results ◽  
Face Length ◽  
The Face ◽  
Floor Stability

The Taiyuan Formation limestone aquifer and Ordovician limestone aquifer are widely distributed in the coal seam floor of coal measures in North China; the water hazard safety problem of the stope floor under the influence of mining is very prominent. The risk of the water inrush from the coal seam floor is closely related to the degree of full exploitation, so it is necessary to study the stability of the stope floor under aquifer conditions, especially the influence of the working face length effect on floor stability. Through numerical simulation of water-rock coupling action, the mine pressure behaviors of the water-resisting floor under different face lengths were analyzed based on the measured formation permeability coefficient. The Fish program was used to adjust rocks entering the plastic failure state into a strain softening model to investigate the influence of the face length effect, the damage degree of the water-resisting floor, and the morphology and deformation bearing capacity of the failure zone. The results show the following: (1) the face length effect is one of the main influence factors of the failure mode and failure degree of surrounding rocks in the stope; (2) as the face length increases, the obvious pressure relief zone of surrounding rocks presents a staged change, and the obvious pressure relief zone at the seam roof and floor is in an obvious “reverse saddle shape”; (3) the closer to the seam floor, the more remarkable the rock softening characteristic because of the compaction action of gangues caving from the roof; and (4) the rock mass close to the seam floor undergoes local tensile failure, and the water-resisting floor near the coal wall at two sides mainly bears compaction-shear action, leading to compression-shear failure of the rock mass at the floor and formation of water-conducting fractures. The study results can provide a reference for taking precautionary measures of safety mining above a confined aquifer.

scholarly journals Functional recovery time after facial fractures: characteristics and associated factors in a sample of patients from southern Brazil

2021 ◽  
Vol 48 ◽  
Author(s):  
VINÍCIUS AZEREDO MULLER ◽  
GUSTAVO KRUMMENAUER BRUKSCH ◽  
GIORDANO SANTANA SÓRIA ◽  
KAREN DA ROSA GALLAS ◽  
FLÁVIO RENATO REIS DE-MOURA ◽  
...  
Keyword(s):  
Medical Records ◽  
Recovery Time ◽  
Facial Trauma ◽  
Facial Fractures ◽  
Prevention Strategies ◽  
Factors Associated ◽  
Elapsed Time ◽  
The Face ◽  
Cox Analysis

ABSTRACT Understanding the cause, severity, and elapsed time for the restoration of the functions of maxillofacial injuries can contribute to the establishment of clinical priorities aiming at effective treatment and further prevention of facial trauma. The objective of this study was to understand the factors associated with the restoration of mastication, ocular, and nasal functions in the face of trauma victims, estimating their recovery time after surgical treatment. We analyzed 114 medical records of patients treated at the Hospital Montenegro, who attended follow-up consultations for up to 180 days. For analysis of the recovery time, we performed survival analysis, followed by COX analysis. We observed that half of the patients recovered their functions within 20 days. The average time for recovery from trauma in the zygomatic-orbital-malar-nasal complex was 11 days, and in the maxillary-mandibular complex, 21 days (HR: 1.5 [0.99 2.3], p = 0.055). Although functional reestablishment has reached high rates after the surgical approach, it is necessary to analyze the failing cases, as well as the economic impacts and the prevention strategies associated with facial trauma, to improve the service to the population.

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