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Tytuł:
Human and operational factors in the risk assessment of ship-to-ship operations
Autorzy:
Abramowicz-Gerigk, T.
Hejmlich, A.
Wilczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/135492.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship to ship operation
risk assessment
human factor
operational factors
ship handling errors
stress levels
Opis:
This paper presents human and operational factors related to risk assessment during the operations of crude oil, petroleum products, and liquefied gas transfer between ships, called Ship to Ship (STS) operations. The lessons learned from accidents during STS when both ships are underway show that the most frequent accidents occur due to ship handling errors. Several influencing factors have already been identified, however there is still a need to investigate the human factor. Both human and operational factors are interrelated as the operational factors influence the human stress level. This paper identifies the stressors related to the external pressures imposed on the ship’s staff, which can be limited to improve safety. The preliminary study of the influence of particular elements of human factors, e.g., personality traits and stress levels, on the probability of ship handling error is presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 73-77
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Supply Chain Network to Reduce Impacts of Damages during Shipping
Autorzy:
Abushaega, Mastoor M.
Daehy, Yahya H.
Alghamdi, Saleh Y.
Krishnan, Krishna K.
Khamaj, Abdulrahman
Powiązania:
https://bibliotekanauki.pl/articles/1841416.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
supply chain network
damage recovery scenarios
closed loop supply chain
type I errors
type II errors
Opis:
Recently, the expand of industrial market has led to have long supply chain network. During the long shipment, the probability of having damaged products is likely to occur. The probability of having damaged products is different between stages and that could lead to higher percentage of damaged products when arrived at retailers. Many companies have rejected the entire shipment because the damaged product percentage was higher than that agreed on. Decision-makers have tried to reduce the percentage of damaged products that happened because the transit, loading unloading the shipment, and natural disasters. Companies started to implement recovery centers in the supply chain network in order to return their system steady statues. Recovery models have been developed in this paper to reduce the damaged percentage at minimum costs to do so. Results show that the possibility of implementing an inspection unit and a recovery centers in the system before sending the entire shipment to the retailer based on examining a sample size that has been selected randomly from the shipment and the minimum cost of committing type I and type II errors. Designing a methodology to minimize the total cost associated with the supply chain system when there is a possibility of damage occurring during shipping is the objective of this research.
Źródło:
Management and Production Engineering Review; 2021, 12, 2; 17-26
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lowering the uncertainty in fast noise measurement procedures
Autorzy:
Acciari, G.
Giannini, F.
Limiti, E.
Saggio, G.
Powiązania:
https://bibliotekanauki.pl/articles/308146.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
noise
device characterisation
measurement errors
lowering uncertainty
Opis:
To completely characterise the noise behaviour of a two port device, four noise parameters F(min), R(n), G(opt) and B(opt) must be determined. This paper reports improvements in the uncertainty related to the above parameters, taking into account measurement errors due both to the limited instrument precision and connection repeatability. Results are reported for noise characterisation of 0.3 žm delta-doped HEMT devices by Alenia, demonstrating as the common hot-cold measurement procedure can result with an error confidence as low as 0.2% for all the noise parameters.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 29-33
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The magnetic field curvature correction algorithm dedicated for helmet mounted cueing systems
Autorzy:
Adamski, M.
Szelmanowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/949523.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
avionics
helmet-mounted cueing systems
errors of the angular positioning
magnetic field measurement
flat coil profile modelling
Opis:
The article presents the new built in Poland helmet mounted cueing system NSC-1 Orion with a magnetic method, dedicated to the multi-purpose helicopters W-3PL Gluszec. This system uses the magnetic field generated by the system of three mutually orthogonal electric coils. The principle of operation of this system is described and the method of determining the angular position of the pilot's helmet relative to the helicopter's cabin using the reference magnetic field and the directional cosines matrix are discussed. Electrical flat coils, constructed in the Polish Air Force Institute of Technology (AFIT), generating a magnetic field with curved symmetry axis characteristics, causing errors in determining the angular position of the pilot's helmet are shown. As a way to minimize these errors, an original proprietary algorithm for correcting the negative impact of the magnetic field curvature generated by the on-board system has been presented. Mathematical relations describing the presented correction process as well as selected results of simulation and experimental investigations in the area of inaccuracy of the "before" and "after" systems of applying the developed algorithm were given. Inaccuracies determined from computer simulations of the developed mathematical relations were compared with experimental data from magnetic field measurements using the integrated three-axis sensor ADIS-16405, used in the laboratory of the AFIT Avionics Division for helmet control of the angular position of the moving observation and sighting head and reflector-search light.
Źródło:
Journal of KONES; 2018, 25, 2; 15-30
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two dimensional model of CMM probing system
Autorzy:
Ali, Salah H.R.
Powiązania:
https://bibliotekanauki.pl/articles/950738.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
CMM
trigger probe
stylus tip
tip root errors
and two-dimensional-model (2DM)
Opis:
A coordinate measuring machine (CMM) as an automation technology is playing the key role in the modern industry to improve the measurement accuracy. Accurate probing that is computer controlled is the current trend for the next generation of coordinate metrology. However, the CMM probing system is limited by its dynamic root errors that may markedly affect its response characteristics. In this paper, dynamic response errors of CMM measurements have been analyzed. The adopted probe stylus sizes throughout the course of measurements are found to cause some waviness errors during CMM operations due to each of the prescribed angle of the probe tip contact point with the specimen surface and the radius of the stylus tip. Variations in the geometry of the stylus have their consequent effects on its inherent intrinsic dynamic characteristics that in turn would cause relevant systematic root errors in the resulted measurements. Unforeseeable geometrical errors of a CMM using a ductile touch-trigger probing system have been characterized theoretically. These results are analyzed in order to investigate the effect of the dynamic root errors in the light of six probe stylus tip of the situation into account when assessing the accuracy of the CMM measurements. Analytical approaches have been applied on a developed two dimensional model (2DM) of stylus tip to demonstrate the capability of such approaches of emphasizing the root error concept using the strategy of CMM ductile trigger type of probe.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 2; 3-7
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wartości odchyłki okrągłości na poziom drgań łożysk
Influence of roundness deviation value on bearing vibration level
Autorzy:
Ambrożkiewicz, B.
Przystupa, K.
Wnuk, S.
Powiązania:
https://bibliotekanauki.pl/articles/310180.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
łożyska toczne
błędy kształtu
poziom drgań łożysk
ball bearings
shape errors
bearing vibration level
Opis:
Niniejszy artykuł rozpatruje wpływ odchyłki okrągłości na poziom drgań generowanych przez łożysko. Jednym z błędów kształtu odgrywającym kluczową rolę w eksploatacji łożysk tocznych jest odchyłka okrągłości. Jej wartość bezpośrednio przyczynia się do miary wielkości drgań węzła łożyskowego. W publikacji opisano dokładniej znaczenie oraz metodykę pomiaru odchyłki okrągłości w odniesieniu do otrzymanego w procesie technologicznym zarysu kształtu powierzchni tocznej łożyska. Eksperyment obejmował dobór pierścieni wewnętrznych łożyska 6009C3 ze zmienną odchyłką okrągłości, a następnie ich montaż z pierścieniami zewnętrznymi charakteryzującymi się małym rozrzutem oraz małą wartością wspomnianej odchyłki. W kolejnym etapie przeprowadzono badania poziomu drgań łożysk. Na koniec, otrzymane rezultaty powiązano z wartością odchyłki okrągłości i na ich podstawie opracowano modele regresji liniowej oraz wyznaczono współczynniki korelacji Pearsona.
This article investigates the influence of roundness value on vibration level generated by bearing. One of the shape errors playing a key role in bearing’s operation is roundness deviation. Its value directly influence on vibration level generated by bearing. In the paper, the significance and methodology of roundness measurements in reference to profile of rolling surface received in technological process. Experiment consisted of inner rings matching of bearing 6009C3 with variable roundness deviation with outer rings characterized with little variability of mentioned deviation. In the next step bearing vibration level was examined. In the end, obtained results were combined with values of roundness deviation and basing on them, models of linear regression were obtained, also Pearson’s correlation coefficients were calculated.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 12; 277-281
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Human Errors and Oil Pollution from Tankers
Autorzy:
Arsenie, P.
Hanzu-Pazara, R.
Powiązania:
https://bibliotekanauki.pl/articles/115991.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
pollution
Environment Protection
Oil Spill
Human Errors
Tankers
Transportation System
Sea Transportation
Petroleum Cargo
Opis:
The economical development of the world is based on transportation system. More than half of the products transported all over the world are carried by sea. Sea transportation is made with different kind of ships, as bulk carriers, cargo vessels, container ships, tankers. Ships are managed by people. In group or as individual, anybody can make errors. In maritime area these errors have as results accidents and disasters. Many of these events affect especially the environment. As 80% of necessary petroleum products are transported by sea, the risk of a major environment disaster caused by human errors is high. Anyway, over 99% of petroleum cargo transported by sea is carried without incidents. This paper presents the effects of human errors, mostly cases that involved tankers, which were produced in the navigation and operational processes.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 4; 409-413
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Students’ Knowledge in Spelling: A Case of a Technical University in Ghana
Autorzy:
Atatsi, Eli Ayawo
Amoakohene, Benjamin
Powiązania:
https://bibliotekanauki.pl/articles/513808.pdf
Data publikacji:
2019-06-30
Wydawca:
Akademia Pedagogiki Specjalnej. Language and Society Research Committee
Tematy:
Spelling errors
Transposition errors
Insertion errors
Substitution errors
Opis:
High proficiency level in spelling is considered to be an important literally skill writers need to be able to establish shared meaning with their readers. However, the Applied Linguistic literature reveals that spelling errors dominantly plaque the essays of students who speak English as Second Language (ESL). In lieu with this, this study sheds light on students’ knowledge in spelling in a Technical University in Ghana. The participants for the study involve 275 students who were randomly selected from three academic levels. The random sampling procedure was further used by the researchers to select 30 English words out of 50 words that have been compiled by the Communicative Skills Unit as the most consistent misspelled words in the written English essays of students of the Technical University over a period of four years. The respondents were further tested on how well they could spell those words. The findings confirm three main types of spelling errors: “insertion errors”, “substitution errors” and “transposition errors”. The findings further reveal that the students’ inability to correctly spell most of the words that were dictated to them is a result of their unfamiliarity with the words, their inability to account for the right pronunciation associated with those words that were dictated to them as well as the failure of students to edit their work after the spelling exercise. It is also confirmed that the academic levels of the students do not have a significant influence on their performance in the spelling.
Źródło:
Language, Discourse & Society; 2019, 7, 1; 239-257
2239-4192
Pojawia się w:
Language, Discourse & Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określenie stopnia zagrożenia pożarem endogenicznym w zrobach ścian zawałowych na podstawie pomiarów telemetrycznych stężenia tlenku węgla
Determination of the danger degree of endogenous fire in goaf caving wall based on telemetry measurements of carbon monoxide concentration
Autorzy:
Badura, H.
Powiązania:
https://bibliotekanauki.pl/articles/113459.pdf
Data publikacji:
2013
Wydawca:
STE GROUP
Tematy:
kopalnie węgla
zagrożenie pożarowe
pomiar telemetryczny
błędy pomiarowe
coal mines
fire hazard
telemetric measurement
measurement errors
Opis:
W artykule przedstawiono metodę pomiarów strumienia objętości tlenku węgla, wydzielającego się do powietrza przepływającego przez rejon ściany. Strumień ten jest wykorzystywany jako jeden ze wskaźników zagrożenia pożarami endogenicznymi. Przedstawiona metoda opiera się na tzw. pomiarach technicznych, możliwych to wykonania przez pracowników kopalń i z wykorzystaniem dostępnego w kopalniach wyposażenia. Przedstawiono sposób pomiaru pola przekroju poprzecznego wyrobiska, prędkości przepływu powietrza, strumienia objętości powietrza oraz tlenku węgla. Podano również sposób obliczania błędów pomiarów.
This paper presents a method for measuring the flow rate of carbon monoxide evolved into the air passing through the area of the wall. This flow is used as one of the indicators of endogenous fire hazard. The presented method is based on the so-called technical measurements which are possible to perform by the coal mines staff and with the use of available in mine equipment. The way of measuring cross-sectional area of excavation, air flow velocity, air volume flow and carbon monoxide was presented. The method of calculating measurement errors was also provided.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2013, 3 (5); 57-66
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognoza jednodniowa średniego stężenia metanu na wylocie z rejonu ściany eksploatującej w systemie sześciodniowego tygodnia pracy - studium przypadku
The one-day forecast of average concentration of methane at the outlet from the area of wall mined at six-day work system - case study
Autorzy:
Badura, H.
Szczęsny, K.
Powiązania:
https://bibliotekanauki.pl/articles/165573.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
zagrożenie metanowe
średnie stężenie metanu
prognoza stężenia metanu
błędy prognozy
methane threat
average methane concentration
methane concentration forecast
forecast errors
Opis:
W artykule przedstawiono i przeanalizowano wyniki jednodniowych prognoz średniego stężenia metanu na wylocie z rejonu ściany 160 w pokładzie 315 w PG „Silesia". Eksploatacja ścianą była prowadzona w systemie sześciodniowego tygodnia pracy kopalni. Prognozami objęto okres 340 dni. Posłużono się trzema wariantami prognoz, przy czym w wariancie podstawowym zastosowano modele prognostyczne opracowane w pracy [1] dla pięciodniowego tygodnia pracy, a dwa pozostałe warianty stanowią modyfikacje tych modeli. Na podstawie analizy błędów bezwzględnych i względnych oceniono dokładność prognoz według poszczególnych wariantów. W najlepszym wariancie prognoz 50% błędów bezwzględnych nie przekraczało 0,065%CH4, a 90% błędów bezwzględnych nie przekraczało 0,166%CH4.
This paper presents and analyzes the results of one-day forecasts of average methane concentration at the outlet from the area of longwall 160 in seam no. 315 at the Mining Enterprise „Silesia". The wall exploitation was carried out in the six-day working week system. The forecasting period comprised 340 days. Three forecasting variants were used - the basic variant used the forecasting models developed in paper [1] for the five-day week and the other two variants constitute modifications of the models. The accuracy of forecasts was estimated on the basis of absolute and relative error analysis, following the given variants. In the best forecasting variant 50% of absolute errors did not exceed 0.065% CH4, and 90% of absolute errors did not exceed 0.166% CH4.
Źródło:
Przegląd Górniczy; 2016, 72, 4; 87-95
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From testing to knowing
Autorzy:
Balle, B.
Powiązania:
https://bibliotekanauki.pl/articles/132114.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
highly precise screw compressors
cold temperatures
coordinate measuring machines
source of errors
Opis:
Ice factories, meat processing plants and breweries around the world rely on the refrigeration technology experts from GEA Refrigeration Germany GmbH. Based in Berlin, the company manufactures highly precise screw compressors, the heart of the cooling systems. In order to ensure and improve the quality and energy efficiency of its compressors, the company strives to permanently eliminate errors in design and production, and at its suppliers. Three ZEISS coordinate measuring machines, as well as ZEISS CALYPSO and ZEISS GEAR PRO software are helping the company come closer to its goals.
Źródło:
Advanced Technologies in Mechanics; 2015, 2, no. 4 (5); 16-21
2392-0327
Pojawia się w:
Advanced Technologies in Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie modułu FPGA platformy sprzętowej sbRIO-9602 do obliczania fazora z zastosowaniem DFT
The use of FPGA module of sbRIO-9602 system for phasor computation with the use of DFT
Autorzy:
Barczentewicz, S.
Nabielec, J.
Powiązania:
https://bibliotekanauki.pl/articles/151469.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wyznaczanie fazora
FPGA
pomiary w systemie elektroenergetycznym
błędy obliczeniowe
phasor estimation
power system measurements
computational errors
Opis:
Praca dotyczy problemu implementacji algorytmu obliczania fazora w jednym układzie scalonym FPGA-SPARTAN, w którym jednocześnie zaimplementowany jest protokół komunikacyjny czasu rzeczywistego dostosowany do PSS (Power Stabilization System). Przedstawione rozwiązanie pozwala na implementację takich obliczeń z możliwie najmniejszą objętością zajmowanych zasobów FPGA i przy jak najmniejszych błędach obliczeniowych. Algorytm obliczeń oparty został o dyskretne przekształcenie Fouriera.
This work presents a novel approach to implementation of the phasor estimation algorithm using a single FPGA module, with simultaneous communication protocol compatible with Power Stabilization System on it. The presented implementation allows for calculations using as little resources as possible. This paper is organized as follows. In Section 1 the definitions and convention of graphical representation of phasor and synchrophasor (Fig. 1) given by [1] are quoted. Moreover, the definition of discrete Fourier transform is recalled [4], for explanation of its usage in the presented algorithm. In Section 2 the programming environment LabVIEW FPGA and the used instrumentation (sbRIO-9602 platform with FPGA module Xilinx Spartan, ADC converter NI9215E) are described. Furthermore, the proposed algorithm of phasor estimation is presented. Figure 2 shows the simplified block diagram of the designed algorithm. Afterwards, the methodology and results from the conducted tests are listed. Table 1 presents the resources utilization statistics of FPGA, and Table 2 shows the compilation of the test results of computational errors of module and phase estimation. Phasor estimation algorithm is based on DFT computation, and more specifically only one DFT bin is used when sampling frequency and observation length are known. Algorithm uses this fact to minimize demand for FPGA resources. Conducted tests showed that the main problem with obtaining high accuracy of algorithm is limited precision of fixed-point calculations.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 3, 3; 141-143
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WYBRANE TRUDNOŚCI W PODSYSTEMIE LEKSYKALNYM W ASPEKCIE KULTUROWYM NA PRZYKŁADZIE BŁĘDÓW KONTEKSTOWYCH W JĘZYKU NIEMIECKIM
Selected difficulties in the lexical system in the cultural view at the base of the context errors
Autorzy:
Bawej, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/1036664.pdf
Data publikacji:
2019-09-04
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu. Collegium Novum. Polskie Towarzystwo Neofilologiczne
Tematy:
errors
context
foreign language
cultural differences
błędy
kontekst
język obcy
różnice kulturowe
Opis:
The paper attempts to describe language errors in the foreign language learning process. I have devoted attention to questions of context errors in the lexico-semantic subsystem made by Polish learners of German. Context errors appearing in statements of individual learning German are the result of interlingual interference process, at the base of which lie cultural differences, different ways of thinking and different kinds of experiences between the native language and the foreign language being learned.
Źródło:
Neofilolog; 2014, 43/2; 209-221
1429-2173
Pojawia się w:
Neofilolog
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of large scale truss construction with structural uncertainties
Autorzy:
Bednár, Róbert
Sága, Milan
Vaško, Milan
Powiązania:
https://bibliotekanauki.pl/articles/41204159.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
uncertain parameters
uncertainties and errors
Monte Carlo method
interval arithmetic
optimization
MATLAB
Opis:
The paper deals with efficiency and usability problem for the chosen solution methods for mechanical systems with structural uncertainties. They are significantly influencing the analysis results and the analysis itself. An application of the chosen approaches will be presented – the first one, a simple combination of only inf-values or only sup-values; the second one presents full combination of all inf-sup values; the third one uses the optimizing process as a tool for finding out an inf-sup solution and last one is Monte Carlo method as a comparison tool.
Źródło:
Studia i Materiały Informatyki Stosowanej; 2011, 4; 17-22
1689-6300
Pojawia się w:
Studia i Materiały Informatyki Stosowanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of regressive relation binding the theoretical and observed final values of curvatures for geological and mining conditions the one of JSW coal mines
Autorzy:
Białek, J.
Mielimąka, R.
Orwat, J.
Powiązania:
https://bibliotekanauki.pl/articles/91975.pdf
Data publikacji:
2015
Wydawca:
Główny Instytut Górnictwa
Tematy:
górnictwo podziemne
deformacja terenu górniczego
błędy projekcyjne
relacja regresywna
mining area deformation
underground mining
projection errors
regressive relation
Opis:
The aim of this paper is obtainment of dependence between practical and theoretical values of curvatures which were calculated at a given level of forecast's safety. The practical curvatures were determined on the basis of results of geodetic measurements conducted on observation points situated in form of line. Values of theoretical curvatures were determined by the usage of EDN – OPN computer program, applying the Budryk – Knothe theory assuming the typical values of its parameters (a = 0.8; tgβ = 2.0; B = 0.32r). Then calculated an unreliability of forecast of curvatures' final values. The regression relation between the observed and theoretical final values of curvatures was determinate assuming the probability of 50% that the measured value will not exceed the predicted value. The values of standard deviation are between 22.84 [m−1 10−6], when all final values of measured and theoretical curvatures are simultaneously taken into account in an linear regression analysis, and 25.32 [m−1 10−6], when a linear regression is carried out for the curvatures measured after the exploitation of the third longwall. The lower value of standard deviation (16.38 [m−1 10−6]) was obtained when a linear regression was made for the curvatures observed after the exploitation of the first longwall. On the basis of the undertaken analysis it can be concluded that for the geological and mining conditions prevailing in the area of measuring line, a regression relation between the measured and theoretical values of curvatures can be expressed by some equation. However, the predicted curvatures are characterized by the calculation error.
Źródło:
Journal of Sustainable Mining; 2015, 14, 2; 76-82
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 356

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