Sample records for materila pabu identifikcijai
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EKSENEL PİSTONLU POMPA VE MOTORLARDA KAYICI PAPUÇ PERFORMANS ARAŞTIRMASI-AKIŞ VE VİSKOZ GÜÇ KAYBI
Directory of Open Access Journals (Sweden)
A. Osman KURBAN
1997-01-01
Full Text Available Bu çalışmada, hidrostatik-hidrodinamik yatakların iyi bir uygulama alanı olan, eğik plakalı eksenel pistonlu pompa ve motorların performansı üzerinde etkili olan kayıcı pabuçlar incelenmiştir. Bununla ilgili olarak viskoz moment kayıpları, viskoz akışkan kaçağı ve güç kayıp denklemleri elde edilip, değişik çalışma ortamlarında bu karakteristik parametrelerin değişimi ve mukayesesi deneysel olarak incelenmiştir.
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HAMRI, Salah
2009-01-01
La préparation des solutions de PH différents, ainsi que la synthèse des réseaux de poly(acrylate de nbutyle)( PABu) et de poly(acrylate de 2-éthylhexyl)(PEHA), par photo polymérisation, constitue la première étape de notre travail, Le comportement de gonflement de réseaux réticulés acryliques l’ABu et l’EHA a été étudié en fonction de trois paramètres : le PH du milieu, le taux de réticulation et la température, Suivant les courbes que nous ayons obtenues, l’influence du PH reste...
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Energy Technology Data Exchange (ETDEWEB)
1988-09-01
In the long term plan of atomic energy development and utilization decided in June, 1987 by the Atomic Energy Commission, it was recognized that hereafter, the opening-up of the new potential that atomic energy possesses should be aimed at, and the policy was shown so that the research and development hereafter place emphasis on the creative and innovative region which causes large technical innovation, by which the spreading effect to general science and technology can be expected, and the development of the base technologies that connect the basic research and project development is promoted. The trend of atomic energy development so far, the change of the situation surrounding atomic energy, the direction of technical development of atomic energy hereafter and the base technologies are discussed. The concept of the technical development of materilas, artificial intelligence, lasers, and the evaluation and reduction of radiation risks used for atomic energy is described. As the development plan of atomic energy base technologies, the subjects of technical development, the future image of technical development, the efficient promotion of the development and so on are shown. (Kato, I.).
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On promotion of base technologies of atomic energy
International Nuclear Information System (INIS)
1988-01-01
In the long term plan of atomic energy development and utilization decided in June, 1987 by the Atomic Energy Commission, it was recognized that hereafter, the opening-up of the new potential that atomic energy possesses should be aimed at, and the policy was shown so that the research and development hereafter place emphasis on the creative and innovative region which causes large technical innovation, by which the spreading effect to general science and technology can be expected, and the development of the base technologies that connect the basic research and project development is promoted. The trend of atomic energy development so far, the change of the situation surrounding atomic energy, the direction of technical development of atomic energy hereafter and the base technologies are discussed. The concept of the technical development of materilas, artificial intelligence, lasers, and the evaluation and reduction of radiation risks used for atomic energy is described. As the development plan of atomic energy base technologies, the subjects of technical development, the future image of technical development, the efficient promotion of the development and so on are shown. (Kato, I.)
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Align and random electrospun mat of PEDOT:PSS and PEDOT:PSS/RGO
Sarabi, Ghazale Asghari; Latifi, Masoud; Bagherzadeh, Roohollah
2018-01-01
In this research work we fabricated two ultrafine conductive nanofibrous layers to investigate the materilas composition and their properties for the preparation of supercapacitor materials application. In first layer, a polymer and a conductive polymer were used and second layer was a composition of polymer, conductive polymer and carbon-base material. In both cases align and randomized mat of conductive nanofibers were fabricated using electrospinning set up. Conductive poly (3,4-ethylenedioxythiophene)/ polystyrene sulfonate (PEDOT:PSS) nanofibers were electrospun by dissolving fiber-forming polymer and polyvinyl alcohol (PVA) in an aqueous dispersion of PEDOT:PSS. The effect of addition of reduced graphene oxide (RGO) was considered for nanocomposite layer. The ultrafine conductive polymer fibers and conductive nanocomposite fibrous materials were also fabricated using an electrospinning process. A fixed collector and a rotating drum were used for random and align nanofibers production, respectively. The resulted fibers were characterized and analyzed by SEM, FTIR and two-point probe conductivity test. The average diameter of nanofibers measured by ImageJ software indicated that the average fiber diameter for first layer was 100 nm and for nanocomposite layer was about 85 nm. The presence of PEDOT:PSS and RGO in the nanofibers was confirmed by FT-IR spectroscopy. The conductivity of align and random layers was characterized. The conductivity of PEDOT:PSS nanofibers showed higher enhancement by addition of RGO in aqueous dispersion. The obtained results showed that alignment of fibrous materials can be considered as an engineering tool for tuning the conductivity of fibrous materials for many different applications such as supercapacitors, conductive and transparent materials.
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Applications of perturbed angular correlation and positron annihilation for materials science
International Nuclear Information System (INIS)
Zhu Shengyun; Zheng Yongnan; Zuo Yi; Zhou Dongmei; Yuan Daqing; Duan Xiao; Wang Zhaohui; Wang Zhiqing; Liu Meng
2005-01-01
hard-sphere random packing model and confirm the continuous random structure in amorphous materials. The hydrogen behavor in PdAg alloy was investigated by both PAC and PAS as functions of temperature from 77 K to RT and hydrogen concentration from 0 to 35 at.%. The results obtained by both PAC and PAS exhibit that the existence of Ag with a concentration of 25 W.% in Pd 0.75 Ag 0.25 alloy severely hampers the formation of hydride and hydrogen atoms separate from grain boundaries and congregate into hydrogen bubbles. The hydrogen bubbles grow with the increasing of the hydrogen concentration. Both PAS and PAC measurements were performed to study the high T c superconductivity of YBaCuO. The PAS experiment found the charge transfer during the superconducting trasition. The results of the PAC measurement suggested a transition of two- to one-dimensional Cu-O-Cu chain structure at the superconducting trasition temperature T c , which favors the charge transfer from the CuO layer to the CuO chain in YBaCuO. The temperature dependence of the local susceptibility of Ce-impurity atoms in La single crystal was measured by PAC from 6 K to RT. An anomalous temperature dependence was observed. The measured dependence shows a normal Curie-Weiss law of local susceptibility and a far departure from this law above and below 30 k, respectively. The present experiment detected a rapid reduction of local susceptibility below 30 K, which is accompanied by a loss of anisotropy of the PAC signals. This shows that the reduction of local susceptibility below 30 K is caused by valence fluctuation of Ce ions that continuously pick up and give a 4f electron to the conduction band. In summary PAC and PAS techniques are very sensitive and powerful tool in materilas science. It can investigate phenomena in condensed matter and give information on material properties on an atomic scale.
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Spatial Structure of Soil Macrofauna Diversity and Tree Canopy in Riparian Forest of Maroon River
Directory of Open Access Journals (Sweden)
Ehsan Sayad
2017-02-01
Full Text Available Introduction: Sustainability and maintenance of riparian vegetation or restoring of degraded sites is critical to sustain inherent ecosystem function and values. Description of patterns in species assemblages and diversity is an essential step before generating hypotheses in functional ecology. If we want to have information about ecosystem function, soil biodiversity is best considered by focusing on the groups of soil organisms that play major roles in ecosystem functioning when exploring links with provision of ecosystem services. Information about the spatial pattern of soil biodiversity at the regional scale is limited though required, e.g. for understanding regional scale effects of biodiversity on ecosystem processes. The practical consequences of these findings are useful for sustainable management of soils and in monitoring soil quality. Soil macrofauna play significant, but largely ignored roles in the delivery of ecosystem services by soils at plot and landscape scales. One main reason responsible for the absence of information about biodiversity at regional scale is the lack of adequate methods for sampling and analyzing data at this dimension. An adequate approach for the analysis of spatial patterns is a transect study in which samples are taken in a certain order and with a certain distance between samples. Geostatistics provide descriptive tools such as variogram to characterize the spatial pattern of continuous and categorical soil attributes. This method allows assessment of consistency of spatial patterns as well as the scale at which they are expressed. This study was conducted to analyze spatial patterns of soil macrofauna in relation to tree canopy in the riparian forest landscape of Maroon. Materilas and Methods: The study was carried out in the Maroon riparian forest of the southeasternIran (30o 38/- 30 o 39/ N and 50 o 9/- 50 o 10/ E. The climate of the study area is semi-arid. Average yearly rainfall is about 350.04 mm