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    Wyświetlanie 1-13 z 13
    Tytuł:
    Dynamical modeling and coupling characteristic analysis of the multistage gears system in a continuous miner
    Autorzy:
    Lu, Wenjia
    Zhang, Yimin
    Cheng, Hongchuan
    Yang, Zhou
    Powiązania:
    https://bibliotekanauki.pl/articles/279213.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    planets
    multistage gear
    continuous miner
    acceleration
    Opis:
    The lumped parameter method is adopted to establish a dynamic model of two stage planets and multistage fixed-shaft gears in which the effect of coupling shaft section radius on the system in a continuous miner is considered. The acceleration test of the system proves the accuracy of the proposed model. With the increase of cross section size of the coupled shaft, the influence of the first stage meshing frequency on the second stage planetary system is enhanced. The acceleration decreases gradually with the increase of the size of coupled carrier. It is shown that the modeling by considering the coupled size contributes to reduction of the vibration level.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2020, 58, 1; 45-58
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecophysiological aspects of the interaction between Cameraria ohridella and Guignardia aesculi on Aesculus hippocastanum
    Autorzy:
    Jagiełło, Radosław
    Baraniak, Edward
    Karolewski, Piotr
    Łakomy, Piotr
    Behnke-Borowczyk, Jolanta
    Walczak, Urszula
    Giertych, Marian J.
    Powiązania:
    https://bibliotekanauki.pl/articles/956794.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    plant growth
    foliage damage
    leaf blotch
    leaf miner
    plant defence
    Opis:
    Popular in the urban environment is the horse chestnut, Aesculus hippocastanum which is suffering mainly due to the feeding of the horse chestnut leaf miner (Cameraria ohridella). The harmfulness of this pest is well recognized. Not much attention was put in discovering the interaction of this insect with the fungal pathogen Guignardia aesuli, the agent of leaf blotch. Host plant mediation in this particular insect-plant pathogen interaction is crucial for understanding the complexity of the horse chestnut’s current and future situation. Recognising the response of the host plant for separated and simultaneous colonisation by insect and fungus was the aim of this study. Leaf damage dynamics and phenolic compounds content (total soluble phenolic compounds – TPh, and condensed tannins – CT), and stem volume increment (SVI) of the horse chestnut saplings was considered and their relationship identified. The main hypothesis was that insect feeding and fungal infection when separated elicit a similar pattern in defence response of the host but this defence response is different when they both coexist on the same plant. Basing on crown projection area photographs sequence, foliage damage dynamics was assessed (Richard’s growth model) and protocol developed. Measurements of stem volume were performed sequentially to indicate potential growth response. Through this study, it was identified that the content of phenolic compounds in leaves was higher when both pests colonized saplings in comparison with those where saplings were infested by one biotic factor. It is also documented that foliage damage dynamics was higher when only the fungal pathogen attacked plants than when it was infected by both pests. A trade-off was identified between growth and secondary metabolism. Leaf damage affected stem volume increment only in the late summer, when a high level of defoliation was observed. Simultaneous infestation by fungal and insect agents made unfavourable conditions rather for the former. How this interaction affects the latter is not covered by our results and still remains undiscovered.
    Źródło:
    Dendrobiology; 2017, 78; 146-156
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The efficiency of a boiter miner - requirements and constraints
    Efektywność kombajnu chodnikowego typu Boiter Miner - wymagania i ograniczenia
    Autorzy:
    Korski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2106550.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    longwall systems
    gallery development
    roadheading
    bolt support (roof bolting)
    bolter miner
    coal mining
    system ścianowy
    kombajny chodnikowe
    drążenie wyrobisk korytarzowych
    obudowa kotwowa
    Bolter Miner
    Opis:
    This paper presents an analysis of the requirements and constraints concerning the efficiency of the application of coal roadway development systems with bolt roof supports by means of specialized mining, loading and bolting machines. In some cases, machines of this type can achieve very good roadway development results measured with the daily/weekly/monthly advancing of the face. An attempt was made to indicate the requirements to be met in order to achieve the expected results, as well as the factors limiting the obtained results of gateroad development operations.
    W artykule przeprowadzono analizę wymagań i ograniczeń efektywności stosowania systemów drążenia chodników w węglu z obudową kotwową za pomocą wyspecjalizowanych maszyn urabiająco-ładująco-kotwiących. Maszyny tego typu uzyskują w niektórych przypadkach bardzo dobre wyniki drążenia mierzone dobowym/tygodniowym, miesięcznym postępem przodka. Podjęto próbę wskazania wymagań, których wypełnienie przyczynia się do uzyskania oczekiwanych wyników oraz czynników ograniczających uzyskane efekty drążenia.
    Źródło:
    Mining – Informatics, Automation and Electrical Engineering; 2020, 58, 1; 37-44
    2450-7326
    2449-6421
    Pojawia się w:
    Mining – Informatics, Automation and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Software architecture design of the information technology for real-time business process monitoring
    Autorzy:
    Batyuk, A.
    Voityshyn, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411035.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    information technology
    process mining
    streaming process discovery
    lambda architecture
    Heuristic Miner
    Opis:
    Having precise understanding of how business processes are performed in real-life is an important input for decision makers and consequently is a strong competitive advantage for an organization. In the constantly changing modern business environment it is crucial to provide that information as soon as possible, preferably in the real-time mode. In practice, such kind of tasks are usually resolved by means of Business Intelligence solutions implemented either from scratch or based upon customizable packages. Despite of the wide range currently available types of data visualizations, modern BI solutions still lacks features to represent data obtained from process-aware systems, for example control flow charts. Current paper is devoted to the information technology for real-time business process monitoring. The represented solution is an extendable software which is based on the lambda architecture and a streaming process discovery technique.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 3; 13-22
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of pick layouts on the performance of bolter miner cutting head
    Autorzy:
    Qiao, S.
    Wang, A. L.
    Xia, Y. M.
    Liu, Z. Z.
    Liu, J. S.
    Yang, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/88893.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    optimum
    pick layout
    bolter miner
    FEM
    coal-rock cutting
    load fluctuation
    Opis:
    A bolter miner is a new type of mining machinery with cutting and anchoring functions. In order to study the best pick layout of bolter miner cutting head. Based on the constitutive relation of Holmquist-Johnson-Cook (HJC), three simulation models of different cutting heads were established, and the whole crushing process of coal-rock was simulated by finite element method (FEM). The influence of the cutting head on the cutting performance under the condition of different rotational speeds and pick layouts was intensively studied. The results show that the relationship of load fluctuation coefficient among the three pick layouts is as follows: sequential type > hybrid type I > checkerboard type. The circumferential pick layouts can reduce the load fluctuation coefficient of cutting head. The rotational speed from 20 to 40 r/min, the torque linearly decreases with the increase of rotational speed. The rota-tional speed increases from 40 to 50 r/min, the cutting torque is relatively stable. The specific energy of chessboard type is relatively higher than the other three cutting heads. The difference of specific energy between sequential type and hybrid type I is not more than 5.5%, and the reality of the simulation is verified by cutting experiments. The results were successfully applied to the first shield type bolter miner in China.
    Źródło:
    Mining Science; 2018, 25; 147-160
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element analysis of load characteristic of shield bolter miner cutting head under complex coal seam condition
    Autorzy:
    Qiao, S.
    Xia, Y. M.
    Liu, Z. Z.
    Liu, J. S.
    Ning, B.
    Wang, A. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/89071.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    complex coal seam
    shield bolter miner
    load characteristic
    specific energy
    load fluctuation
    Opis:
    Aiming at the complex conditions of the first shielded bolter miner in the actual work, the mechanical model of bolter miner cutting head was established. Based on cutting mechanism of the conical pick and the cutting head, the cutting head load and torque analysis model under complex coal seam were established. The dynamic characteristics of load and torque in the process of cutting head are analyzed under three different working conditions of cutting roof-coal layers, coal-floor layers and coal seam by finite element method. The results show that when the damage variable D=1, the coal-rock completely lacks the bearing capacity, and it forms arc-shaped crushing groove on the coal-rock. The large difference of torque between roof-coal layers and the roof-coal layers in the conical pick is 112 Nm, which indicates that the cutting head has the best performance with cutting the coal seam first and then cutting the rock. In the process of excavation, the load fluctuation coefficient of cutting the coal-floor layers and roof-coal layers is about 1.2 times of that of the coal seam. The results can provide a reference for the efficient cutting and performance evaluation of the bolter miner.
    Źródło:
    Mining Science; 2017, 24; 85-97
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industrial Noise as a Source of Threat in the Field of Blasting Technology in Coal Mines
    Autorzy:
    Mocek, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2064361.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    blasting works
    hearing loss
    hearing test
    noise
    miner
    prace strzałowe
    utrata słuchu
    badanie słuchu
    hałas
    górnik
    Opis:
    The publication presents partial results of hearing screening tests conducted in 2019 among employees of 37 hard coal mines located in the Śląskie and Małopolskie voivodships. The tests were carried out in different cities of both voivodships using the Mobile Hearing Diagnosis Center, which parked near the selected mine and specialized hearing diagnostics points of the ACSłuchmed Sp. z o. o. from Lublin. At the diagnostic points, detailed total audiometry tests were conducted on people diagnosed with hearing disorders as part of screening tests. The obtained results allowed to identify branches and workplaces with the highest risk of noise hazard in mines. The presented publication shows the results of noise measurement during blasting works and the results of anonymous surveys conducted among employees of the Department of Blasting Technology of hard coal mines. The survey concerned the subjective feelings of employees regarding noise levels at the workplace and its impact on their well-being and state of health. In the publication summary, the author draws attention to the need to take measures to constantly control the noise level at the workplace and introduce solutions that will enable its reduction and allow for better protection of employees against its damaging consequences.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 83--97
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technological and Economic Analysis of the Application of Surface Miner on the Example of a Limestone Deposit in Poland
    Autorzy:
    Zajączkowski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2020065.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    limestone deposit
    surface miner
    technology of extraction
    non-blasting extraction
    złoża wapieni
    górnictwo powierzchniowe
    technologia
    ekstrakcja
    Opis:
    Mining a deposit utilizing surface miner is very popular in many countries. Presently, a surface miner has also experimented with extracting different deposits: bauxite, hematite, sandstone, shale etc. Surface miners can completely eliminate drilling and blasting operation and primary crushing unit, thus reducing their associated environmental hazards. Apart from this, the sized excavated material increases transport or conveying efficiency and saves the energy requirement in processing. So far, these machines have not been used in Poland. To evaluate this technology, tests were carried out on one of the limestone deposit in Poland. During these tests, basic parameters of efficiency, output quantity and mining costs were defined. The conducted tests have shown that this technology cannot be used in all geological and mining conditions. Therefore, the article presents the advantages and disadvantages of using surface miner, taking into account the Polish geological and mining conditions.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 237--242
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of a Modern Technical Solution in Continuous Miner Machine Technology
    Autorzy:
    Mężyk, Arkadiusz
    Pawlak, Mariusz
    Kania, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/2064276.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    continuous miner
    road header machine
    permanent magnet motor
    silnik z magnesami trwałymi
    maszyna górnicza
    maszyna urabiająca
    Opis:
    In this paper is presented the overview of Continuous Miners available on the market. Numbers describe machines from 1 to 41 and parameters obtained from manufacturers catalogues are presented on diagrams. The statistical analysis of some of parameters are carried out by linear approximation to show factors determining, for example, the total power of installed engines to the power of the cutting head drive, the total power of installed engines to the total mass, cutting height to the cutter diameter and cutting height to the cutting width, etc. Thin layers of coal less than 1.2 m thick and remnants of seams that require work on a system of boards and columns constitute an increasing share of coal deposits. Geometric restrictions, in this case, are closely correlated with the construction form of the machine and they must have high performance with limited geometric dimensions. This type is called “Continuous Miner”, and is closely correlated with those restrictions. The paper reviews the technical solutions used in these machines, which are currently used around the world. Particular attention is paid to the new concept of the cutting drum drive system, in which permanent magnet motors are proposed. Placing them in a cutting drum improves the efficiency of the mining process and the possibility of modular configuration depending on the required working conditions.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 272--282
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of some microbial agents, natural and chemical compounds for controlling tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)
    Autorzy:
    El-Ghany, N.M.A.
    Abdel-Razek, A.S.
    Ebadah, I.M.A.
    Mahmoud, Y.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/65257.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microbial agent
    natural compound
    chemical compound
    biopesticide
    natural insecticide
    controlling
    tomato
    leaf miner
    Tuta absoluta
    Lepidoptera
    Gelechiidae
    Opis:
    Solanaceous plants have a great economic impact in Egypt. These groups of plants include potatoes, tomatoes and eggplants. The new invasive pest of tomatoes, Tuta absoluta (Meyrick) causes the greatest crop losses which can range from 60 to 100%. After its detection in Egypt during the last half of 2009, it spread quickly to all provinces in the country. We aiming to propose a sustainable control program for this devastating pest. In this research we tested three groups of control agents. The first was microbial and natural, the second – plant extracts and the third – chemical insecticides. Our results showed that the impact of T. absoluta can be greatly reduced by the use of sustainable control measures represented by different insecticide groups. Bioassay experiments showed that this devastating pest can be controlled with some compounds that give high mortality rates. Of these compounds, spinosad and Beauveria bassiana, microbial control agents, followed by azadirachtin, gave the best results in controlling T. absoluta. Of the chemical insecticides, lambda-cyhalotrin was the most effective, followed by lufenuron and profenofos. In conclusion we encourage farmers to use microbial and natural control measures in combating the tomato leafminer, T. absoluta, in Integrated Pest Mangement (IPM) programs.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance evaluation of continuous miner based underground mine operation system: An OEE based approach
    Autorzy:
    Banerjee, Sumit
    Powiązania:
    https://bibliotekanauki.pl/articles/2064394.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    Continuous Miner
    Overall Equipment Effectiveness
    availability
    performance
    quality
    reliability
    maszyna górnicza
    OEE
    ogólna efektywność sprzętowa
    dostępność
    wydajność
    jakość
    niezawodność
    Opis:
    CM is a globally renowned machine, designed to work as a mass production technology for underground coal. Different major coal producers across the globe are using this technology for decades to produce underground coal efficiently. India is also one of the major players globally in the arena of coal production and adopted this cutting edge technology since last decade by implementing at. few of the selective underground coal mining projects. Performance of CM technology is influenced by the geo-mining condition, fleets of other ancillary units and reliability of subsystems while implementation of this system depends largely on the extent of reserve. These aspects generate a scope of large scale research and development in this field. Overall Equipment Effectiveness (OEE) is the parameter to benchmark the equipment performance globally. OEE is the product of equipment availability, performance and product quality. This mining machine based paper focuses on the Overall Equipment Effectiveness (OEE) of the complete CM based operation to identify the vulnerable systems, which helps to design proper preventive maintenance programme. The CM based system is divided into few subsystems, such as; electrical, cutter, gathering arrangement, traction, hydraulic, chassis, feeder breaker, shuttle car, CM conveyor and out-bye conveyor. The downtime data used for this analysis is collected from an underground coal mine situated in the central part of India, belongs to one leading coal producing company of the country. From analysis it was found that, electrical systems and conveyors are among most vulnerable systems and deserves more care during maintenance. On the basis of these results recommendations are made to redesign the Preventive Maintenance Programme, in order to avoid the lower availability as well as lower OEE.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 596--603
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current state, habitat and potential invasiveness of Montia linearis (Douglas ex Hook.) Greene in Poland
    Autorzy:
    Dembicz, I.
    Kozub, L.
    Zaniewski, P.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/59192.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    present state
    habitat
    biological invasion
    Montia linearis
    narrowleaf miner's lettuce
    weed dispersal
    intensive agriculture
    cattle
    animal breeding
    meadow
    non-native species
    Polska
    Opis:
    Montia linearis is a vascular plant originating from western North America. The expansion of this species has been observed for several decades. For the first time M. linearis was found in Europe in 1989. Further six populations were documented by 2004 within the continent: three in Poland, two in Denmark and one in Hungary. Apart from discovering a new population of M. linearis, we confirmed two out of the three previously known localities of the species in Poland. All the currently known populations of M. linearis occupied predominantly meadow habitats, especially intensively managed sites. Some individuals were also found in disturbed sites with bare soil. The studied species inhabited soils of various types with broad range of fertility as well as humidity. Montia linearis populations reached densities up to 87 individuals per 0.04 m2. The number of seeds produced by an individual was between 10 and 55 in 90% of the studied specimens, however much more fertile specimens were also observed. As the previously presented hypothesis of M. linearis dispersal with rail transport seemed not to be well supported, the connection between the M. linearis presence and cattle husbandry is considered. It is possible that the species can be transferred with living animals or manure. The species was able to survive for at least 26 years within once inhabited site. Further spread of M. linearis within Europe is highly probable. The aim of the study is to: (i) describe the current state of populations of M. linearis in Poland, (ii) provide information on habitat preferences and biology of the species, (iii) assess the invasiveness potential of M. linearis in Poland.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2015, 84, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data mining system for air quality monitoring networks
    Autorzy:
    Czechowski, P.
    Badyda, A.
    Majewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/204820.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air pollutants
    data quality analysis
    data mining
    estimation
    exploratory methods
    harmonic
    principal component analysis
    statistical tests outliers
    influential
    leverage observations
    analytical software system
    programming
    Eco Data Miner
    EDM
    Winsorized mean
    Cook
    Mahalanobis distance
    DFITS
    COVRATIO
    Opis:
    The use of quantitative methods, including stochastic and exploratory techniques in environmental studies does not seem to be sufficient in practical aspects. There is no comprehensive analytical system dedicated to this issue, as well as research regarding this subject. The aim of this study is to present the Eco Data Miner system, its idea, construction and implementation possibility to the existing environmental information systems. The methodological emphasis was placed on the one-dimensional data quality assessment issue in terms of using the proposed QAAH1 method - using harmonic model and robust estimators beside the classical tests of outlier values with their iterative expansions. The results received demonstrate both the complementarity of proposed classical methods solution as well as the fact that they allow for extending the range of applications significantly. The practical usefulness is also highly significant due to the high effectiveness and numerical efficiency as well as simplicity of using this new tool.
    Źródło:
    Archives of Environmental Protection; 2013, 39, 4; 123-147
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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