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Wyświetlanie 1-11 z 11
Tytuł:
Optimization test of operation of URB/ZS-3 automatic machine for breaking oversized lumps under conditions of Polkowice-Sieroszowice mine
Autorzy:
Ziętkowski, L.
Młynarczyk, J.
Sobolewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/111326.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
optimization
mining
breaking oversized lumps
Opis:
This article presents the experience from the first stage of the optimization tests of an automatic machine for breaking oversized lumps. The tests took place between December 2017 and March 2018 at the O/ZG Polkowice-Sieroszowice mine. The URB/ZS-3 automatic machine was developed as part of the second competition of a joint venture financed by NCBR and KGHM Polska Miedź S.A. under the name of CuBR. The adopted methodology of carrying out the operational tests of the URB/ZS-3 machine was discussed, which had to take into account the specific requirements and operating conditions of the mining department in the Polkowice-Sieroszowice mine. The reference point for evaluating the effectiveness of the new solution was the cleaning times of the grate by a machine working in remote mode. The results of clearing the grate of excavated materials by a machine working in automatic mode were presented for various algorithms and scenarios included in the control software. The influence of the degree of ore fragmentation (including the number of oversized lumps) on the time of the grate cleaning was taken into account. The influence of the changes introduced in this software on the obtained grate discharge times was initially evaluated. The article also presents the impact of loading the grate with the use of loaders and haul trucks on the effectiveness of the automatic machine for breaking oversized lumps. Also, the driver elements of the machine were assessed in terms of their reliability, and the directions for possible structural changes were proposed. In conclusion, the directions for further activities aimed at optimizing the machine and increasing its efficiency and reliability were proposed.
Źródło:
Mining – Informatics, Automation and Electrical Engineering; 2018, 56, 4; 83-92
2450-7326
2449-6421
Pojawia się w:
Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evolution of mechanized excavating systems in LGOM mines conditions
Autorzy:
Młynarczyk, J.
Mertuszka, P.
Ziętkowski, L.
Bodlak, M.
Powiązania:
https://bibliotekanauki.pl/articles/89087.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
mechanized excavating system
longwall shearer
roadheader
Opis:
This paper details the experiences of national copper ore mining associated with mechanized rock excavating systems. In particular, the machines used, technological solutions, efficiencies, and problems related to their implementation to underground copper mining conditions on Fore-Sudetic Mono-cline are discussed. Beginning from the experiences of „Konrad” mine in the Old Copper Basin where cutter-loaders type WŁE-50S were used - and ending with the ongoing tests with the Caterpillar ACT longwall shearer in the „Polkowice-Sieroszowice” mine. The implementation of mechanical excavation systems in KGHM’s mines has not reached a successful level thus far, but the results achieved during the previous attempts are promising. The roadheaders used while excavating the mining drifts achieved very good results considering the given mining-organizational conditions.
Źródło:
Mining Science; 2015, 22, Special Issue 2; 93-104
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational Exposure to Natural UV Radiation and Premature Skin Ageing
Autorzy:
Łastowiecka-Moras, E.
Bugajska, J.
Młynarczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/90648.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
UV radiation
outdoor workers
photoageing
promieniowanie UV
pracownicy
skóra człowieka
warunki pracy
Opis:
The skin is the part of the human body most vulnerable to ultraviolet (UV) radiation. The spectrum of the negative effects of UV radiation on the skin ranges from acute erythema to carcinogenesis. Between these extreme conditions, there are other common skin lesions, e.g., photoageing. The aim of this study was to assess the skin for signs of photoageing in a group of 52 men occupationally exposed to natural UV radiation. There were 2 types of examinations: an examination of skin condition (moisture, elasticity, sebum, porosity, smoothness, discolourations and wrinkles) with a device for diagnosing the skin, and a dermatological examination. The results of both examinations revealed a higher percentage of skin characteristics typical for photoageing in outdoor workers compared to the general population.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 4; 639-645
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of polymorphism of IS-1311 sequence in Mycobacterium avium subspecies paratuberculosis strains isolated from milk samples
Autorzy:
Szteyn, J.
Bednarko-Młynarczyk, E.
K. Liedke
Wiszniewska-Łaszczych, A.
Wojtacka, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087864.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mycobacterium avium subsp. paratuberculosis
milk
IS-1311 polymorphism
Źródło:
Polish Journal of Veterinary Sciences; 2017, 4; 827-829
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matrix metalloproteinases in urinary system tumors. Part II - Matrix metalloproteinases in urinary bladder carcinoma
Autorzy:
Młynarczyk, G.
Kudelski, J.
Darewicz, B.
Galewska, Z.
Romanowicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1918522.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
matrix metalloproteinases
urinary tract tumors
urinary bladder carcinoma
Opis:
Matrix metalloproteinases (MMPs), also referred to as matrixines, provide a group of proteolytic enzymes. They belong to the family of endopeptidases that break down elements of the extracellular matrix, resulting in its continuous remodeling. Their activity is regulated at multiple levels, while tissue inhibitors of metalloproteinases play a major role in this process. Metalloproteinases play a significant part in neoplastic processes due to their contribution to local tumor invasion, the formation of distant metastases, as well as to angiogenesis Urinary tract tumors pose a significant diagnostic and therapeutic challenge and their incidence tends to grow every year. The aim of this second part of the review is to describe the urinary system structure and function, and to highlight the contribution of matrix metalloproteinases to the development of urinary bladder tumors
Źródło:
Progress in Health Sciences; 2017, 7(1); 169-174
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matrix metalloproteinases in urinary system tumours. Part I - Matrix metalloproteinases in renal cell carcinoma
Autorzy:
Młynarczyk, G.
Kudelski, J.
Darewicz, B.
Galewska, Z.
Romanowicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1918434.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Extracellular matrix
matrix metalloproteinases
urinary tract tumours
renal clear cell carcinoma
Opis:
Extracellular matrix metalloproteinases - MMPs, also referred to as matrixines, provide a group of proteolytic enzymes. They belong to the family of endopeptidases that break down elements of extracellular matrix, resulting in its continuous remodelling. Their activity is regulated at multiple levels, while tissue inhibitors of metalloproteinases play a major role in this process. Metalloproteinases play a significant part in neoplastic processes due to their contribution to local tumour invasion and formation of distant metastases, as well as to angiogenesis Urinary tract tumours pose a significant diagnostic and therapeutic challenge and their incidence tends to grow every year. The aim of this part of review is to describe extracellular matrix and matrix metalloproteinases and to highlight the contribution of matrix metalloproteinases in the development of renal clear cell carcinoma.
Źródło:
Progress in Health Sciences; 2017, 7(1); 161-168
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma Coatings on Aluminium-Silicon Alloy Surfaces
Autorzy:
Długosz, P.
Garbacz-Klempka, A.
Piwońska, J.
Darłak, P.
Młynarczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2079836.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plasma coating
Al-Si alloy
plasma oxidation
anodizing
powłoki plazmowe
stop Al-Si
utlenianie plazmowe
anodowanie
Opis:
Plasma oxidation, similarly to anodic oxidation (anodizing), are classified as electrochemical surface treatment of metals such as Al, Mg, Ti and their alloys. This type of treatment is used to make surface of castings, plastically processed products, shaped with incremental methods to suitable for certain requirements. The most important role of the micro plasma coating is to protect the metal surface against corrosion. It is well known that coating of aluminium alloys containing silicon using anodic oxidation causes significant difficulties. They are linked to the eutectic nature of this alloy and result in a lack of coverage in silicon-related areas. The coating structure in these areas is discontinuous. In order to eliminate this phenomenon, it is required to apply oxidation coatings using the PEO (Plasma Electrolytic Oxidation) method. It allows a consistent, crystalline coating to be formed. This study presents the mechanical properties of the coatings applied to Al-Si alloy using the PEO method. As part of the testing, the coating thickness, microhardness and scratch resistance were determined. On the basis of the results obtained, it was concluded that the thickness of the coatings complies with the requirements of conventional anodizing. Additionally, microhardness values exceeded the results obtained with standard methods.
Źródło:
Archives of Foundry Engineering; 2021, 21, 3; 96-101
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of milk of cows in the first lactation vs. presence of anti-Ostertagia antibodies in their milk
Autorzy:
Liedtke, K.
Szteyn, J.
Bialobrzewski, I.
Wiszniewska-Laszczych, A.
Bednarko-Mlynarczyk, E.
Powiązania:
https://bibliotekanauki.pl/articles/31880.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Invasions of gastrointestinal nematodes in dairy cows may affect animals productivity. The most frequently detected internal parasite of dairy cattle is Ostertagia ostertagi. The objective of this study was to determine O. ostertagi invasion extensiveness in selected herds of dairy cattle, with special consideration to cows being in the first lactation, and to analyze the milk yield and contents of basic constituents of milk originating from sero-positive cows. Five herds of dairy cattle (403), with different populations of cows, were selected for the study. Invasion extensiveness in particular herds was determined and ranged from 11.9% to 27.27%. Cows being in the first lactation, the udder milk of which was shown to contain anti-O. ostertagi antibodies, were producing on average 470 kg of milk annually less than cows being in the same lactation period. The analysis of results did not confirm the statistical significance of this difference, likewise it did not demonstrate any statistically significant differences in contents of fat, protein and dry matter. Despite a lack of the statistical significance a producer suffers great economic losses. The conducted study proves that the occurrence of O. ostertagi invasion in herds of dairy cattle is a global problem and that it affects cost-effectiveness of milk production.
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the kinetics of survival of Staphylococcus aureus in regional yogurt from goat’s milk
Autorzy:
Bednarko-Mlynarczyk, E.
Szteyn, J.
Bialobrzewski, I.
Wiszniewska-Laszczych, A.
Liedtke, K.
Powiązania:
https://bibliotekanauki.pl/articles/2087984.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of this study was to determine the kinetics of the survival of the test strain of Staphylococcus aureus in the product investigated. Yogurt samples were contaminated with S. aureus to an initial level of 103-104 cfu/g. The samples were then stored at four temperatures: 4, 6, 20, 22oC. During storage, the number of S. aureus forming colonies in a gram of yogurt was determined every two hours. Based on the results of the analysis culture the curves of survival were plotted. Three primary models were selected to describe the kinetics of changes in the count of bacteria: Cole's model, a modified model of Gompertz and the model of Baranyi and Roberts. Analysis of the model fit carried out based on the average values of Pearson's correlation coefficient, between the modeled and measured values, showed that the Cole's model had the worst fit. The modified Gompertz model showed the count of S. aureus as a negative value. These drawbacks were not observed in the model of Baranyi and Roberts. For this reason, this model best reflects the kinetics of changes in the number of staphylococci in yogurt.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The presence of anti-Hypoderma antibodies in udder milk samples, and correlation with selected parameters of dairy performance
Autorzy:
Bednarko-Mlynarczyk, E.
Szteyn, J.
Bialobrzewski, I.
Wiszniewska-Laszczych, A.
Liedtke, K.
Powiązania:
https://bibliotekanauki.pl/articles/30409.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Hypoderma
antibody
udder
milk sample
correlation
milk parameter
dairy performance
ELISA test
hypodermosis
dairy cow
cow
milk yield
milk protein
animal disease
parasitic disease
Opis:
Hypodermosis is responsible for significant economic losses and remains a current problem in animal husbandry. This study determined the extent of Hypoderma spp. invasion in north-eastern Poland in dairy herds. The extent of the invasion, determined on the basis of positive results of an ELISA assay (Bovine Hypodermosis Milk Screening of Institut Pourquier), varied in herds. Statistical analysis performed on the results of milk productivity and content of basic components revealed a decrease in the milk yield and changes in milk protein in animals revealing positive, doubtful and negative results. Statistically significant differences were absent as regards the content of milk fat or milk total solids. The milk yield and the content of particular milk components were determined using the AT4 method, as part of a control program carried out by the Polish Federation of Cattle Breeders and Dairy Farmers (PFHBiPM).
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of genotype on selected clinical features of Polish cystic fibrosis adults
Autorzy:
Majka, L
Pogorzelski, A.
Mlynarczyk, W.
Zebrak, J.
Rutkiewicz, E.
Nowicka, A.
Witt, M.
Powiązania:
https://bibliotekanauki.pl/articles/2041802.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
genotype-phenotype correlation
diagnosis
Polska
genotype
late diagnosis
cystic fibrosis
adult
Źródło:
Journal of Applied Genetics; 2001, 42, 3; 367-377
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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