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Search Results: 1 - 10 of 524813 matches for " Abdurakhmanov G. M. "
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REVIEW OF TESTACEOUS MITES SPECIES OF ACARIFORMES, ORIBATIDA OF THE INTERNAL MOUNTAIN DAGESTAN Обзор панцирных клещей acariformes, oribatida внутреннего горного Дагестана
Abdurakhmanov G. M.,Davudova E. Z.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: The research was made on the territory of the Internal mountain Dagestan. There were found 190 species of Oribatida belonging to 83 genera; 1 species isdetermined and scientifically described for the first time [3], 2 species are registrated in the Caucasus for the first time [1, 2, 4], and 10 species are first found in Dagestan [2, 4], 15 species are endemic Caucasus species [4]
MATERIALS AND METHODS OF THE STUDY FOR DETERMINATION OF THE SPECIES COMPOSITION OF THE FOUR GROUPS OF SOIL COLEOPTERA INSECTS (CARABIDAE, SCARABAEIDAE, ELATERIDAE, TENEBRIONIDAE) - PESTS OF AGRICULTURAL CROPS OF THE REPUBLIC OF DAGESTAN Материалы и методика исследования для определения видового состава четырех групп почвенных жесткокрылых насекомых (Саrаbidае, Scarabaeidае, Elateridae, Теnebrionid
Abdurakhmanov G. M.,Kassem A. S.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2012,
Abstract: The article contains the species composition of the four families of soil Coleoptera (ground beetles, scarab, beetles, darkling) marked for different agricultural crops of the Republic of Dagestan
ROLE AND PLACE IN AGROECOSYSTEMS SOIL COLEOPTERA INSECTS (CARABIDAE, SCARABAEIDAE, ELATERIDAE, TENEBRIONIDAE) - PESTS OF AGRICULTURAL CROPS OF THE REPUBLIC OF DAGESTAN Роль и место в агроэкосистемах почвенных жесткокрылых насекомых (Coleoptera: Саrаbidае, Scarabaeidае, Elateridae, Теnebrionidае) - вредителей сельскохозяйственных культур Республики Дагестан
Abdurakhmanov G. M.,Kassem A. S.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: The article presents the role and the place of soil beetles (Coleoptera: Carabidae, Scarabaeidae, Elateridae, Tenebrionidae) - pests of agricultural crops in agro-ecosystems and their study, collection, identification of species composition and distribution of the plants in the Republic of Dagestan
MATERIALS TO TROPHIC RELATIONS OF OWLET MOTHS (LEPIDOPTERA, NOCTUIDAE) FROM PUBLISHED SOURCES AND VEGETATION OF THE ISLAND NORDOVY OF THE NORTH-WESTERN CASPIAN SEA Материалы к трофическим связям совок (lepidoptera, noctuidae) по литературным источникам и по растительности острова Нордовый Северо-западного Каспия
Abdurakhmanov G. M.,Teimurov A. A.,Abdurakhmanov A. G.,Kurbanova N. S.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: The article cites the results of our studies of species composition of moths and their trophic communication as well as alternative types of plants used by owlet moths on the Nordovy island. Also, the article presents the species composition of fauna found on the island
MATERIALS TO TROPHIC RELATIONS OF OWLET MOTHS (LEPIDOPTERA, NOCTUIDAE) FROM PUBLISHED SOURCES AND VEGETATION OF THE TULENIY ISLAND OF THE NORTH-WESTERN CASPIAN SEA Материалы к трофическим связям совок (lepidoptera, noctuidae) по литературным источникам и по растительности острова Тюлений Северо-западного Каспия
Abdurakhmanov G. M.,Abdurakhmanov A. G.,Teimurov A. A.,Kurbanova N. S.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: The article cites the results of our studies of species composition of moths and their trophic communication as well as alternative types of plants used by owlet moths on the Tuleniy island. Also, the article presents the species composition of fauna found on the island
On the Conduction Mechanism of Silicate Glass Doped by Oxide Compounds of Ruthenium (Thick Film Resistors)  [PDF]
Gulmurza Abdurakhmanov
World Journal of Condensed Matter Physics (WJCMP) , 2011, DOI: 10.4236/wjcmp.2011.12004
Abstract: The results of the investigation of conduction mechanism of silicate glass doped by oxide compounds of ruthenium (thick film resistor) are reported. The formation of diffusion zones in the softened glass during firing process of the mixture of the glass and the dopant powders is considered. As the result the doping glass becomes conductive. These diffusion zones have higher conductivity and act as percolation levels for the free charge carriers. The effect of tem-perature and duration of firing process on the conductivity of doped glass is considered. Experimental results are in a good agreement with the model.
Effect of Glass Composition on the Thermal Expansion of Relict Crystals of RuO2 in Doped Lead-Silicate Glasses (Thick Film Resistors)  [PDF]
Gulmurza Abdurakhmanov
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.27076
Abstract: The thermal expansion coefficients (TEC) of RuO2 crystallits in thick film resistor (TFR) composites, consisting of RuO2 dispersed in lead-silicate glass of various compositions, were evaluated from X-ray diffraction patterns at temperatures 298; 773; 973 and 1123 K corresponding to characteristic temperatures of resistivity and thermopower anomalies of the TFRs. It has been found that TEC of free RuO2 powder along a-axis has an anomaly at T > 973 K (expansion is replaced by constriction), whereas constriction along c-axes remains for all temperatures. This anomaly disappears in doped glass of simplest composition (2SiO2.PbO) but occurs in glasses of some complex compositions. Symmetry of unit cell of RuO2 is not changed in the temperature range investigated.
On the Conduction Mechanism of Silicate Glass Doped by Oxide Compounds of Ruthenium (Thick Film Resistors). 3. The Minimum of Temperature Dependence of Resistivity  [PDF]
Gulmurza Abdurakhmanov
World Journal of Condensed Matter Physics (WJCMP) , 2014, DOI: 10.4236/wjcmp.2014.43021
Abstract:
This article is the final part of the investigation of conduction mechanism of silicate glass doped by oxide compounds of ruthenium (thick film resistors). In the first part [1], the formation of percolation levels due to diffusion of dopant atoms into the glass has been considered. The diffusion mechanism allowed us to explain shifting of the percolation threshold towards to lower value and the effect of firing conditions as well as the components composition on the electrical conduction of the doped glass. The coexistence of thermal activation and localization of free charge carriers as the result of nanocrystalline structure of the glass was the subject of the second part [2]. Because of it, the resistivity of the doped silicate glass is proportional to exp (–aTζ) at low temperatures (T < 50 K), 0.4 < ζ < 0.8. Structural transitions of nanocrystals take place at high temperatures (T > 800 K) and the conductivity of the doped silicate glass decreases sharply. We consider the origin of the minimum in the temperature dependence of resistivity of the doped silicate glass here. It is shown that the minimum arises from merge of impurity band into the valence band of glass at temperature high enough, so
Two-particle rapidity correlations between relativistic particles in central collisions of $^{197}$Au nuclei in emulsion at 11.6 A GeV/c
U. U. Abdurakhmanov,K. G. Gulamov,V. Sh. Navotny
Physics , 2015,
Abstract: It is shown that in central collisions of $^{197}$Au nuclei with heavy emulsion nuclei at 11.6 $A$GeV/c the magnitude of two-particles pseudorapidity short-range correlations for produced particles is strongly suppressed whereas the magnitude of long-range correlations is considerably enhanced in comparison with nucleon-nucleon interactions. The experimental data are compared with calculations based on the FRITIOF-M model and the model of independent emission of particles.
Interaction of RuO2 and Lead-Silicate Glass in Thick-Film Resistors  [PDF]
Gulmurza Abdurakhmanov, Gulbahor S. Vakhidova, Lutfullo X. Tursunov
World Journal of Condensed Matter Physics (WJCMP) , 2011, DOI: 10.4236/wjcmp.2011.11001
Abstract: Results of investigation of X-ray diffraction, infrared and optical spectra of powders of the ruthenium dioxide, lead-silicate glass as well as their mixture before and after sintering are reported. Sintering conditions typical for thick film resistors were used. Intensity of main lines of RuO2 in X-ray diffraction patterns of sintered mixtures decreases and they slightly shift towards small angles. No new reflexes appear in these patterns. Absorbance of RuO2 in the range of 2.5-100 μm is proportional to and featureless. Infrared spectrum of lead-silicate glass has absorption bands of [SiO4]4- tetrahedra and Pb-O bonds only. Optical spectrum of RuO2 has wide absorption bands at 950 and 370 nm. Spectra of the mixture of RuO2 and glass powders before and after sintering are different indicating that there is interaction between them during the sintering process. Concentration of free charge carriers estimated from the optical spectra is about 1021 cm-3.
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