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    Wyświetlanie 1-12 z 12
    Tytuł:
    The application of redundancy in LEACH protocol
    Zastosowanie nadmiarowości w protokole LEACH
    Autorzy:
    Mosorov, V.
    Biedron, S.
    Panskyi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/407751.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    LEACH
    reliability
    node
    IIS-LEACH
    niezawodność
    sensor
    Opis:
    Nowadays wireless sensor networks have gained much popularity due to their flexibility. This progress has enabled the use of sensor nodes on an unprecedented scale and opened new opportunities for the so-called ubiquitous computerization. The total freedom of nodes distribution within the wireless sensor network (WSN), where the wireless characteristic is one of the greatest advantages of WSN, implies its greatest weaknesses. To overcome this challenge specialized routing protocols, such as many different version of LEACH, were ushered in so as to make effective use of the energy of the nodes themselves. This article aims to show the functioning of a new author’s solution, called IIS-LEACH, which uses redundancy as a basic element in increasing the reliability of WSN networks
    W dzisiejszych czasach bezprzewodowe sieci czujników zyskują coraz to większą popularność ze względu na swoją elastyczność. Postęp ten, umożliwił zastosowanie węzłów sensorowych na niespotykaną dotąd skalę i otworzył nowe możliwości dla tzw. wszechobecnej komputeryzacji. Całkowita dowolność w rozmieszczeniu węzłów jak i jego bezprzewodowy charakter, stanowiący jedną z największych zalet wykorzystania bezprzewodowych sieci sensorowych, implikuje jego największą słabość – ograniczania związane z mobilnymi źródłami zasilania oraz nowymi problemami w zachowaniu niezawodności sieci. W celu efektywnego wykorzystania energii węzłów, zaczęto stosować wyspecjalizowane protokoły routingu takie jak LEACH. Celem tego artykułu będzie pokazanie nowe, zmodyfikowanej wersji tego protokołu o nazwie ISS-LEACH.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 2; 50-53
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of leaching kinetics modelling to a gold cyanide leach plant by using real plant data
    Autorzy:
    Sayiner, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/109738.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gold
    cyanide
    leach
    kinetics
    model
    Opis:
    Gold cyanide leach kinetics modeling was applied to the Bergama Ovacik gold cyanide leach plant in Turkey by processing the real plant data without need of any laboratory work. For this aim, solid ore samples were taken from each leaching tanks and analysed for gold contents as Au ppm while plant variables such as solid % concentrations in each tank, feed rate of plant as megagrams per hour (Mg/h), slurry flow rate as m3/h and the slurry residence times in each tank calculated and noted for modelling study. Five sampling work performed at plant at different times. Each sampling data were modelled seperately by the Anglo-American Research Laboratories (AARL) leach kinetics model to obtain five seperate model parameters and regression coefficient (R2) values. Then, total five sampling data were all together modelled to obtain just one model equation and R2 value to represent the plant generally. All R2 values were above 0.90 indicating that the AARL gold leaching kinetics model fits well on real plant leaching conditions. By using the model parameters, the residual gold contents in each tank were predicted for different possible ore feed rate tonnages such as 80, 90, 100, 110 and 120 megagrams per hour. Thus, leaching recoveries for any ore feed rate would be estimated for possible tonnage increases in the future.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 109-114
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leach and heed clustering algorithms in wireless sensor networks: a qualitative study
    Autorzy:
    Kazerooni, A A
    Jelodar, H
    Aramideh, J
    Powiązania:
    https://bibliotekanauki.pl/articles/958002.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wireless sensor networks
    clustering algorithm
    HEED
    LEACH
    Opis:
    Wireless sensor network consists of numerous small and low cost sensors which collect and transmit environmental data. These nodes are spatially distributed and capable of measuring their ambient. Sensor node is responsible for collecting data in regular intervals, converting the obtained data into electronic signals and transmitting data to sink node or base station through reliable wireless communications. Moreover, these nodes are supplied by non-rechargeable batteries with limited energy. Lifetime and network coverage are crucial factors in WSNs. Thus, particular algorithms must be employed so that energy consumption is reduced. In this paper two clustering algorithms LEACH and HEED are investigated.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 25; 7-11
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytotoxic Test of Octopus cyanea Ink Extract
    Autorzy:
    Kalor, John Dominggus
    Simaremare, Eva Susanty
    Futwembun, Allowisya
    Wabiser, Gloria
    Gunawan, Elsye
    Yabansabra, Yuliana Rut
    Powiązania:
    https://bibliotekanauki.pl/articles/125432.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    toxicity
    Octopus cyanea
    Artemia salina leach
    LC50
    Opis:
    Marine biodiversity of Papua is very high, but unfortunately research and utilization in medicine are limited. Many species of flora and fauna are used in ethopharmacology as drugs but without scientific explanation, e.g. octopus (Octopus cyanea), found in the Northern Papua Sea. The aim of this research was to test the toxicity of the ethanol octopus ink. The toxicity was tested with the Brine Shrimp Lethality Test (BSLT) method. The samples were collected from the sea of Biak island in West Papua, extracted with ethanol, ethyl acetate, and dichloromethane then tested the toxicity for Artemia salina leach larvae. The toxicity test involved concentrations of 1000, 750, 500, 250, 100, 75, 50, and 25 ppm. The result showed that ethanol extract of octopus ink has LC50 of 290 ppm, ethyl acetate extract has LC50 of 947 ppm, whereas dicholoromethane extract – 2190 ppm.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 8; 144-152
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The dependence between the number of rounds and implemented nodes in LEACH routing protocol-based sensor networks
    Zależność pomiędzy liczbą rund oraz ilością zaimplementowanych węzłów w sieci sensorowej opartej na protokole LEACH
    Autorzy:
    Mosorov, V.
    Biedron, S.
    Panskyi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/408889.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    LEACH
    sensor network
    node
    sieć sensorowa
    sensor
    Opis:
    In the 21st century wireless sensor networks have gained much popularity due to their flexibility. This progress has enabled the use of sensor nodes on an unprecedented scale and opened new opportunities for the so-called ubiquitous computerization. The total freedom of nodes distribution within the wireless network, where the wireless characteristic is one of the greatest advantages of the use of wireless sensor networks, implies its greatest weakness, i.e. the limitation of mobile power sources. To overcome this challenge specialized routing protocols, such as LEACH, were ushered in for making the effective use of the energy of the nodes themselves. The purpose of this article is to show how the life of a sensor network depends on the number of nodes equipped with a mobile limited power source.
    W XXI wieku sieci czujników bezprzewodowych zyskały bardzo dużą popularność przede wszystkim ze względu na swoją elastyczność. Szybki rozwój oraz postępy w tej dziedzinie umożliwiły wykorzystanie czujników na bezprecedensową skalę i otworzyły nowe możliwości dla tzw. wszechobecnej komputeryzacji. Całkowita swoboda rozmieszczenie węzłów w sieci bezprzewodowej, jest jedną z największych zalet zastosowania tej technologii. Niestety atut ten jest ten przyczyną największej słabości bezprzewodowych sieci sensorowych tj. zapewnieniem wydajnego, bezprzewodowego źródła zasilania. Jednym ze sposobów sprostowania temu wyzwaniu było opracowanie specjalistycznych protokołów routingu takich jak LEACH, których celem było efektywne wykorzystanie mobilnych źródeł energii umieszczonych w samych węzłach. Badanie przeprowadzone i opisane w tej publikacji ukazuje wpływ liczebności węzłów na życie badanej sieci sensorowej z wykorzystaniem protokołu LEACH.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 3; 60-63
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion exchange investigation for recovery of uranium from acidic pregnant leach solutions
    Autorzy:
    Danko, B.
    Dybczyński, R. S.
    Samczyński, Z.
    Gajda, D.
    Herdzik-Koniecko, I.
    Zakrzewska-Kołtuniewicz, G.
    Chajduk, E.
    Kulisa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147778.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium recovery
    acidic pregnant leach solution
    ion exchange separation
    Opis:
    The article describes studies on the separation of uranium from acid pregnant leach solutions obtained from Polish uranium ores: dictyonema shales and sandstone rocks. Ion exchange chromatography was applied for uranium sorption, using commercially available, strongly basic anion exchanger, Dowex 1. In model experiments, the influence of degree of crosslinking of Dowex 1 on the efficiency of uranium extraction was investigated. The effect of H2SO4 concentration on the breakthrough curve of uranyl ions for the Dowex 1 resins, of different crosslinking: X4, X8 and X10, was examined. Unexpectedly high increase of exchange capacity of uranium was observed in case of Dowex 1X10. This gives potential opportunity of improving the effectiveness of uranium recovery process. Applying column packed with Dowex 1X10, ‘yellow cake’ with ca. 92% yield and high purity of recovered uranium was obtained. A block diagram of the procedure for uranium and lanthanides extraction from acidic leach liquor has been proposed.
    Źródło:
    Nukleonika; 2017, 62, 3; 213-221
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Theoretical Review of Topological Organization for Wireless Sensor Network
    Autorzy:
    Patil, Sarang Dagajirao
    Patil, Pravin Sahebrao
    Powiązania:
    https://bibliotekanauki.pl/articles/1844489.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    clustering algorithms
    DEBC
    heterogeneous networks
    LEACH
    wireless sensor network
    Opis:
    The recent decades have seen the growth in the fields of wireless communication technologies, which has made it possible to produce components with a rational cost of a few cubic millimeters of volume, called sensors. The collaboration of many of these wireless sensors with a basic base station gives birth to a network of wireless sensors. The latter faces numerous problems related to application requirements and the inadequate abilities of sensor nodes, particularly in terms of energy. In order to integrate the different models describing the characteristics of the nodes of a WSN, this paper presents the topological organization strategies to structure its communication. For large networks, partitioning into sub-networks (clusters) is a technique used to reduce consumption, improve network stability and facilitate scalability.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 507-515
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of nut shell addition on the permeability of a crushed gold ore
    Autorzy:
    Yilmaz, S.
    Sirkeci, A. A.
    Bilen, M.
    Yigit, I.
    Kizgut, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/110544.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    permeability
    nut shells
    heap leaching
    gold leaching
    leach efficiency
    Opis:
    In this study, variations in permeability of a gold ore by nut shell addition was studied. Ore particle size, nut shell size and volume fraction in the ore were the parameters investigated. Permeability is an important issue in heap leach operations considering the processing duration. Particularly below 6 mm particle size permeability is greatly hampered. Turkey is the leading country in the world in hazelnut production. Therefore, considerable amounts of nut shell are obtained as a by-product. Incerase in the permeability of a finely crushed ore will obviously enable an increase in the leaching efficiency. The finer the particle size the more the liberation of gold is yet the permeability is lower. Therefore, this study focuses on the possibility of improving the permeability of ore heaps with nut shell addition. Optimum amount of nut shell which should be added to the ore was found to be 5% by volume. It was found that the permeability of ore crushed below 2.36 mm considerably increased by the addition of nut shell below 18 mm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 467-475
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Analysis of LEACH with Deep Learning in Wireless Sensor Networks
    Autorzy:
    Prajapati, Hardik K.
    Joshi, Rutvij
    Powiązania:
    https://bibliotekanauki.pl/articles/2200710.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    machine learning
    Deep learning
    Convolutional Neural Network (CNN)
    LEACH
    Opis:
    Thousands of low-power micro sensors make up Wireless Sensor Networks, and its principal role is to detect and report specified events to a base station. Due to bounded battery power these nodes are having very limited memory and processing capacity. Since battery replacement or recharge in sensor nodes is nearly impossible, power consumption becomes one of the most important design considerations in WSN. So one of the most important requirements in WSN is to increase battery life and network life time. Seeing as data transmission and reception consume the most energy, it’s critical to develop a routing protocol that addresses the WSN’s major problem. When it comes to sending aggregated data to the sink, hierarchical routing is critical. This research concentrates on a cluster head election system that rotates the cluster head role among nodes with greater energy levels than the others.We used a combination of LEACH and deep learning to extend the network life of the WSN in this study. In this proposed method, cluster head selection has been performed by Convolutional Neural Network (CNN). The comparison has been done between the proposed solution and LEACH, which shows the proposed solution increases the network lifetime and throughput.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 799--805
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructures and Microwave-Absorbing Properties of ZnO Smoke from Zinc Leach Residue Treated by Carbothermal Reduction
    Autorzy:
    Ma, Zhiwei
    Wang, Sheng
    Du, Xueyan
    Zhang, Ji
    Zhao, Ruifeng
    Zhang, Shengquan
    Powiązania:
    https://bibliotekanauki.pl/articles/2049146.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc leach residue
    carbothermal reduction
    ZnO smoke
    microwave-absorbing properties
    Opis:
    Much zinc residue is produced during the traditional processes involved in zinc hydrometallurgy in the leaching stage: its composition is complex and valuable metals are difficult to recover therefrom. If not handled properly, it can lead to a waste of resources and environmental pollution. To solve this problem, zinc leach residue specimens were treated using the carbothermal reduction method (CTR) that is easy to operate and has a high energy utilisation rate. The methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) were used for analytical characterisation. Based on this, this research investigated a structure-function relationship between microstructures and microwave-absorbing properties of ZnO smoke from CTR-treated zinc leach residue. The results demonstrate that microstructures and macro-properties of ZnO smoke obtained at different temperatures differ greatly. Under conditions including a calcination temperature of 1250°C, holding time of 60 min, and addition of 50% and 10% of powdered coal and CaO separately, the ZnO content in the obtained smoke is 99.14%, with regular micron-sized ZnO particles therein. For these particles, the minimum reflection loss (RLmin) reached –25.56 dB at a frequency of 15.84 GHz with a matching thickness of 5 mm. Moreover, frequency bandwidth corresponding to RL < –10 dB can reach 2.0 GHz. ZnO smoke obtained using this method is found to have excellent microwave-absorbing performance, which provides a new idea for high-value applications of zinc-rich residue.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1163--1170
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation stability of 125I-brachytherapy sources
    Autorzy:
    Saxena, S.
    Ram, R.
    Dash, A.
    Joshi, P.
    Venkatesh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148254.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    retinoblastoma
    125 I-brachytherapy sources
    radiation stability
    SEM
    leach rate
    Opis:
    Low energy 125I-brachytherapy sources are used for the treatment of retinoblastoma and many other forms of eye cancer. Such sources were prepared by adsorption of 125I on palladium coated silver rods and were critically evaluated for safety aspects, as per AERB standards. In order to attain low leachability and to facilitate leak free laser encapsulation of sources within titanium capsules of size 0.8 mm (f) ´ 4.75 mm (l), the radioactive source core was coated with polystyrene. With a view to study the radiation stability of such sources over a period of three weeks, both polymer coated radioactive sources and inactive source cores were separately subjected to an integrated gamma dose of ~(17.85 ´ 104) Gy (17.85 MRad), which is the dose expected to be received in three weeks from a source containing ~ 111 MBq of 125I. This was carried out to test their suitability for reuse within such period. SEM pictures of inactive source cores were taken to observe the effect of gamma radiation on palladium coating. Post-irradiation leachability and uniformity of activity of radioactive sources were evaluated and found to be satisfactory. The sources were found to be reusable safely, for repeated brachytherapy procedures over a practically useful time of at least three weeks.
    Źródło:
    Nukleonika; 2007, 52, 1; 13-16
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of proactive & reactive protocols for cluster based routing algorithms in WSNs
    Autorzy:
    Mohammed, Ibrahim Yahia
    Powiązania:
    https://bibliotekanauki.pl/articles/1062952.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Clustering based
    Energy
    LEACH
    Proactive
    Reactive
    Routing protocol
    Sensors
    TEEN
    WSNs
    Opis:
    Wireless Sensor Networks (WSNs) are networks that consist of sensors which are randomly deployed in inaccessible area to gathering data and transfer it to user or base station. The most important matters considered in sensor networks are efficient utilization of energy, network lifetime, and environmental conditions changes. To provide the communication facilities within the network a routing protocol is used. There are many techniques used to route data in sensor networks, clustering based is one of most common techniques used, cluster based routing protocols can be classified to proactive and reactive protocol depending on how source finds a route to destination. This paper is aim to study and compare the two mechanisms in cluster based routing by discuss different characteristics in each mechanism, and also analyzed the performance of two mechanisms by take two exemplar protocols LEACH and TEEN from proactive and reactive mechanism respectively in order to compare the performance in same scenario and simulation parameters.
    Źródło:
    World Scientific News; 2019, 124, 2; 131-142
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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