67 research outputs found

    New Exact Solutions of a Generalized Shallow Water Wave Equation

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    In this work an extended elliptic function method is proposed and applied to the generalized shallow water wave equation. We systematically investigate to classify new exact travelling wave solutions expressible in terms of quasi-periodic elliptic integral function and doubly-periodic Jacobian elliptic functions. The derived new solutions include rational, periodic, singular and solitary wave solutions. An interesting comparison with the canonical procedure is provided. In some cases the obtained elliptic solution has singularity at certain region in the whole space. For such solutions we have computed the effective region where the obtained solution is free from such a singularity.Comment: A discussion about singularity and some references are added. To appear in Physica Script

    Wp-2 basic investigation of transition effect

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    An important goal of the TFAST project was to study the effect of the location of transition in relation to the shock wave on the separation size, shock structure and unsteadiness of the interaction area. Boundary layer tripping (by wire or roughness) and flow control devices (Vortex Generators and cold plasma) were used for boundary layer transition induction. As flow control devices were used here in the laminar boundary layer for the first time, their effectiveness in transition induction was an important outcome. It was intended to determine in what way the application of these techniques induces transition. These methods should have a significantly different effect on boundary layer receptivity, i.e. the transition location. Apart from an improved understanding of operation control methods, the main objective was to localize the transition as far downstream as possible while ensuring a turbulent character of interaction. The final objective, involving all the partners, was to build a physical model of transition control devices. Establishing of such model would simplify the numerical approach to flow cases using such devices. This undertaking has strong support from the industry, which wants to include these control devices in the design process. Unfortunately only one method of streamwise vortices was developed and investigated in the presented study

    ΠžΡ†Π΅Π½ΠΊΠ° эффСктивности управлСния Π΄Π΅ΡΡ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚ΡŒΡŽ прСдприятия

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    ЦСлью исслСдования являСтся ΠΎΡ†Π΅Π½ΠΊΠ° эффСктивности управлСния Π΄Π΅ΡΡ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚ΡŒΡŽ прСдприятия ΠΊΠ°ΠΊ ΠΈΠ½Ρ‚Π΅Π³Ρ€Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ показатСля, Ρ‚ΠΎ Π΅ΡΡ‚ΡŒ управлСния ΡΠΎΠ²ΠΎΠΊΡƒΠΏΠ½ΠΎΡΡ‚ΡŒΡŽ Π΄Π΅ΡΡ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚Π΅ΠΉ, Ρ‚Π°ΠΊΠΈΡ… ΠΊΠ°ΠΊ производствСнная, инвСстиционная, инновационная, маркСтинговая ΠΈ финансовая

    Π£ΡΡ‚ΠΎΠΉΡ‡ΠΈΠ²ΠΎΡΡ‚ΡŒ Π½ΠΈΠΊΠ΅Π»Π΅Π²Ρ‹Ρ… ΠΏΡ€ΠΎΠΌΡ‹ΡˆΠ»Π΅Π½Π½Ρ‹Ρ… ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€ΠΎΠ² мСтанирования ΠΊ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡ‚Π²ΠΈΡŽ органичСских абсорбСнтов удалСния диоксида ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π° ΠΈΠ· синтСз-Π³Π°Π·Π°

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    We report the results of studies on the influences of the organic carbon dioxide absorbent – aqueous solution of activated methyldiethanolamine (MDEA) – on the physico-chemical and mechanical characteristics of nickel-alumina catalyst NIAP-07-01 (NKM-1) and cement-containing catalysts NIAP-07-07 (NKM-7), Meth-134 and Meth-135 for the hydrogenation of carbon oxide (methanation). It is established that for the nickel-alumina and nickel-cement-containing catalysts subjected to activated methyldiethanolamine (MDEA) it’s possible to restore their strength and catalytic properties. In order to increase the time of operation of the methanator it is recommended to apply a new Nickel cement-containing catalyst NIAP-07-07 (NKM-7), which can be produced as tablets, rings or extrudates.ΠŸΡ€ΠΈΠ²Π΅Π΄Π΅Π½Ρ‹ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ исслСдований воздСйствия органичСского абсорбСнта Π² Π²ΠΈΠ΄Π΅ Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ раствора Π°ΠΊΡ‚ΠΈΠ²ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ мСтилдиэтаноламина (ΠœΠ”Π­Π), ΡΠ²Π»ΡΡŽΡ‰Π΅Π³ΠΎΡΡ абсорбСнтом диоксида ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π° ΠΏΡ€ΠΈ Π΅Π³ΠΎ ΡƒΠ΄Π°Π»Π΅Π½ΠΈΠΈ ΠΈΠ· Π°Π·ΠΎΡ‚ΠΎ-Π²ΠΎΠ΄ΠΎΡ€ΠΎΠ΄Π½ΠΎΠΉ смСси, Π½Π° Ρ„ΠΈΠ·ΠΈΠΊΠΎ-химичСскиС ΠΈ Ρ„ΠΈΠ·ΠΈΠΊΠΎ-мСханичСскиС характСристики никСльалюминиСвого ΠΌΠ°Ρ€ΠΊΠΈ НИАП-07-01 (НКМ-1) ΠΈ цСмСнтсодСрТащих ΠΌΠ°Ρ€ΠΊΠΈ НИАП-07-07 (НКМ-7), Meth-134 ΠΈ Meth-135 ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€ΠΎΠ² гидрирования оксидов ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π° (мСтанирования). УстановлСно, Ρ‡Ρ‚ΠΎ Π½ΠΈΠΊΠ΅Π»ΡŒΠ°Π»ΡŽΠΌΠΈΠ½ΠΈΠ΅Π²Ρ‹Π΅ ΠΈ Π½ΠΈΠΊΠ΅Π»ΡŒΡ†Π΅ΠΌΠ΅Π½Ρ‚ΡΠΎΠ΄Π΅Ρ€ΠΆΠ°Ρ‰ΠΈΠ΅ ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€Ρ‹, ΠΏΠΎΠ΄Π²Π΅Ρ€Π³Π½ΡƒΡ‚Ρ‹Π΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡ‚Π²ΠΈΡŽ Π°ΠΊΡ‚ΠΈΠ²ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ мСтилдиэтаноламина (ΠœΠ”Π­Π), Π²ΠΎΡΡΡ‚Π°Π½Π°Π²Π»ΠΈΠ²Π°ΡŽΡ‚ свои прочностныС ΠΈ каталитичСскиС свойства. Для увСличСния Π²Ρ€Π΅ΠΌΠ΅Π½ΠΈ эксплуатации ΠΌΠ΅Ρ‚Π°Π½Π°Ρ‚ΠΎΡ€Π° рСкомСндуСтся ΠΏΡ€ΠΈΠΌΠ΅Π½ΡΡ‚ΡŒ Π½ΠΎΠ²Ρ‹ΠΉ Π½ΠΈΠΊΠ΅Π»Π΅Π²Ρ‹ΠΉ цСмСнтсодСрТащий ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€ ΠΌΠ°Ρ€ΠΊΠΈ НИАП-07-07 (НКМ-7), ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ ΠΌΠΎΠΆΠ΅Ρ‚ ΠΈΠ·Π³ΠΎΡ‚Π°Π²Π»ΠΈΠ²Π°Ρ‚ΡŒΡΡ Π² Π²ΠΈΠ΄Π΅ Ρ‚Π°Π±Π»Π΅Ρ‚ΠΎΠΊ, ΠΊΠΎΠ»Π΅Ρ† ΠΈΠ»ΠΈ экструдатов

    Π£ΡΡ‚ΠΎΠΉΡ‡ΠΈΠ²ΠΎΡΡ‚ΡŒ Π½ΠΈΠΊΠ΅Π»Π΅Π²Ρ‹Ρ… ΠΏΡ€ΠΎΠΌΡ‹ΡˆΠ»Π΅Π½Π½Ρ‹Ρ… ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€ΠΎΠ² мСтанирования ΠΊ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡ‚Π²ΠΈΡŽ органичСских абсорбСнтов удалСния диоксида ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π° ΠΈΠ· синтСз-Π³Π°Π·Π°

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    Received: 16.06.2017; accepted: 06.09.2017; published: 20.10.2017.ΠŸΠΎΡΡ‚ΡƒΠΏΠΈΠ»ΠΎ: 16.06.2017; принято: 06.09.2017; ΠΎΠΏΡƒΠ±Π»ΠΈΠΊΠΎΠ²Π°Π½ΠΎ: 20.10.2017.We report the results of studies on the influences of the organic carbon dioxide absorbent – aqueous solution of activated methyldiethanolamine (MDEA) – on the physico-chemical and mechanical characteristics of nickel-alumina catalyst NIAP-07-01 (NKM-1) and cement-containing catalysts NIAP-07-07 (NKM-7), Meth-134 and Meth-135 for the hydrogenation of carbon oxide (methanation). It is established that for the nickel-alumina and nickel-cementcontaining catalysts subjected to activated methyldiethanolamine (MDEA) it’s possible to restore their strength and catalytic properties. In order to increase the time of operation of the methanator it is recommended to apply a new Nickel cement-containing catalyst NIAP-07-07 (NKM-7), which can be produced as tablets, rings or extrudates.ΠŸΡ€ΠΈΠ²Π΅Π΄Π΅Π½Ρ‹ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ исслСдований воздСйствия органичСского абсорбСнта Π² Π²ΠΈΠ΄Π΅ Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ раствора Π°ΠΊΡ‚ΠΈΠ²ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ мСтилдиэтаноламина (ΠœΠ”Π­Π), ΡΠ²Π»ΡΡŽΡ‰Π΅Π³ΠΎΡΡ абсорбСнтом диоксида ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π° ΠΏΡ€ΠΈ Π΅Π³ΠΎ ΡƒΠ΄Π°Π»Π΅Π½ΠΈΠΈ ΠΈΠ· Π°Π·ΠΎΡ‚ΠΎ-Π²ΠΎΠ΄ΠΎΡ€ΠΎΠ΄Π½ΠΎΠΉ смСси, Π½Π° Ρ„ΠΈΠ·ΠΈΠΊΠΎ-химичСскиС ΠΈ Ρ„ΠΈΠ·ΠΈΠΊΠΎ-мСханичСскиС характСристики никСльалюминиСвого ΠΌΠ°Ρ€ΠΊΠΈ НИАП-07-01 (НКМ-1) ΠΈ Ρ†Π΅ΠΌΠ΅Π½Ρ‚-содСрТащих ΠΌΠ°Ρ€ΠΊΠΈ НИАП-07-07 (НКМ-7), Meth-134 ΠΈ Meth-135 ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€ΠΎΠ² гидрирования оксидов ΡƒΠ³Π»Π΅Ρ€ΠΎΠ΄Π° (мСтанирования). УстановлСно, Ρ‡Ρ‚ΠΎ Π½ΠΈΠΊΠ΅Π»ΡŒΠ°Π»ΡŽΠΌΠΈΠ½ΠΈΠ΅Π²Ρ‹Π΅ ΠΈ Π½ΠΈΠΊΠ΅Π»ΡŒΡ†Π΅ΠΌΠ΅Π½Ρ‚ΡΠΎΠ΄Π΅Ρ€ΠΆΠ°Ρ‰ΠΈΠ΅ ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€Ρ‹, ΠΏΠΎΠ΄Π²Π΅Ρ€Π³Π½ΡƒΡ‚Ρ‹Π΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡ‚Π²ΠΈΡŽ Π°ΠΊΡ‚ΠΈΠ²ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ мСтилдиэтаноламина (ΠœΠ”Π­Π), Π²ΠΎΡΡΡ‚Π°Π½Π°Π²Π»ΠΈΠ²Π°ΡŽΡ‚ свои прочностныС ΠΈ каталитичСскиС свойства. Для увСличСния Π²Ρ€Π΅ΠΌΠ΅Π½ΠΈ эксплуатации ΠΌΠ΅Ρ‚Π°Π½Π°Ρ‚ΠΎΡ€Π° рСкомСндуСтся ΠΏΡ€ΠΈΠΌΠ΅Π½ΡΡ‚ΡŒ Π½ΠΎΠ²Ρ‹ΠΉ Π½ΠΈΠΊΠ΅Π»Π΅Π²Ρ‹ΠΉ цСмСнтсодСрТащий ΠΊΠ°Ρ‚Π°Π»ΠΈΠ·Π°Ρ‚ΠΎΡ€ ΠΌΠ°Ρ€ΠΊΠΈ НИАП-07-07 (НКМ-7), ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ ΠΌΠΎΠΆΠ΅Ρ‚ ΠΈΠ·Π³ΠΎΡ‚Π°Π²Π»ΠΈΠ²Π°Ρ‚ΡŒΡΡ Π² Π²ΠΈΠ΄Π΅ Ρ‚Π°Π±Π»Π΅Ρ‚ΠΎΠΊ, ΠΊΠΎΠ»Π΅Ρ† ΠΈΠ»ΠΈ экструдатов

    A checklist of native freshwater fish from Brantas River, East Java, Indonesia

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    Hasan V, Mamat NB, South J, Ottoni FP, Widodo MS, Arisandi P, Isroni W, Jerikho R, Samitra D, Faqih AR, Simanjuntak CPH, Mukti AT. 2022. A checklist of native freshwater fish from Brantas River, East Java, Indonesia. Biodiversitas 23: 6031-6039. This study aims to provide information on the freshwater fish species composition of the Brantas River, the second-largest river in Java, Indonesia. All samples used in this study were the caught activities during Fish Resource Survey (form May 5, 2021 to August 20, 2022). Sampling was carried out in four stations of the Brantas River, representing upstream, the Karangkates Reservoir, midstream, and downstream. This work recorded 42 fish species divided into 35 genera and 21 families. Cyprinidae was the dominant family, comprising 12 genera and 15 species. According to the IUCN Red List, most fish species inhabiting the Brantas River have a conservation status of Least Concern (LC) or Data Deficient (DD), except for Rasbora lateristriata which is categorized as Vulnerable (VU). Genera Tor and Neolissochilus are rarely found in Javanese waters. We suggest that the conservation status of these species should be reviewed. Information on habitat use and ecological interactions of fish occurring in the Brantas River are needed urgently to make appropriate conservation decisions and plans. Therefore, we suggest that more collections need to be carried out in the studied river, as well as studies based on eDNA analysis and research incorporating both morphological and molecular data

    ΠŸΡ€Π΅Π΄ΠΊΠ΅Ρ€Π°ΠΌΠΈΡ‡Π΅ΡΠΊΠΈΠ΅ ΠΌΠΎΠ½ΠΎΠΌΠ΅Ρ€Ρ‹ для получСния Π½ΠΈΡ‚Ρ€ΠΈΠ΄Π° ΠΈ ΠΊΠ°Ρ€Π±ΠΎΠ½ΠΈΡ‚Ρ€ΠΈΠ΄Π° крСмния ΠΌΠ΅Ρ‚ΠΎΠ΄Π°ΠΌΠΈ химичСского осаТдСния ΠΈΠ· Π³Π°Π·ΠΎΠ²ΠΎΠΉ Ρ„Π°Π·Ρ‹

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    Tris(N-methyl)trimethylcyclotrisilazane (cyclosilazane-1) and tetra(N-methyl)tetramethylcyclotetrasilazane (cyclosilazane -2), that are promising preceramic monomers for the production of oxygen-proof materials based on silicon carbonitride and nitride by Π‘VD and CVI, were obtained through methyldichlorosilane aminolysis, isolated and characterized by 1Н, 29Si NMR and gas-liquid chromatography. The conducted research resulted in the identification of factors effecting the reaction direction. According to solvent nature the reaction may be directed either towards cyclosilazane-1 formation or cyclosilazane-2 formation. In terms of efficiency, that is defined as cyclosilazane-1 to cyclosilazane-2 ratio, the solvents may be arranged in the following sequence: rubber solvent > rubber solvent + DE (diethyl ether) > nefras + DE > dichloromethane + DE > benzene.Π’Ρ€ΠΈ(N-ΠΌΠ΅Ρ‚ΠΈΠ»)тримСтилциклотрисилазан (циклосилазан-1) ΠΈ Ρ‚Π΅Ρ‚Ρ€Π°(N-ΠΌΠ΅Ρ‚ΠΈΠ»)Ρ‚Π΅Ρ‚Ρ€Π°ΠΌΠ΅Ρ‚ΠΈΠ»-циклотСтрасилазан (циклосилазан-2), ΡΠ²Π»ΡΡŽΡ‰ΠΈΠ΅ΡΡ пСрспСктивными прСдкСрамичСскими ΠΌΠΎΠ½ΠΎ-ΠΌΠ΅Ρ€Π°ΠΌΠΈ для получСния ΠΎΠΊΠΈΡΠ»ΠΈΡ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚ΠΎΠΉΠΊΠΈΡ… ΠΌΠ°Ρ‚Π΅Ρ€ΠΈΠ°Π»ΠΎΠ² ΠΈ формирования ΠΌΠ°Ρ‚Ρ€ΠΈΡ† ΠΊΠΎΠΌ-ΠΏΠΎΠ·ΠΈΡ†ΠΈΠΎΠ½Π½Ρ‹Ρ… ΠΌΠ°Ρ‚Π΅Ρ€ΠΈΠ°Π»ΠΎΠ² Π½Π° основС Π½ΠΈΡ‚Ρ€ΠΈΠ΄Π°, ΠΊΠ°Ρ€Π±ΠΎΠ½ΠΈΡ‚Ρ€ΠΈΠ΄Π° крСмния ΠΌΠ΅Ρ‚ΠΎΠ΄Π°ΠΌΠΈ химичСского осаТдСния ΠΈΠ· Π³Π°Π·ΠΎΠ²ΠΎΠΉ Ρ„Π°Π·Ρ‹, Π±Ρ‹Π»ΠΈ ΠΏΠΎΠ»ΡƒΡ‡Π΅Π½Ρ‹ Π°ΠΌΠΈΠ½ΠΎΠ»ΠΈΠ·ΠΎΠΌ мСтилдихлорсилана, Π²Ρ‹Π΄Π΅Π»Π΅Π½Ρ‹ ΠΈ ΠΎΡ…Π°Ρ€Π°ΠΊΡ‚Π΅Ρ€ΠΈΠ·ΠΎΠ²Π°Π½Ρ‹ ΠΌΠ΅Ρ‚ΠΎΠ΄Π°ΠΌΠΈ спСктроскопии ЯМР 1Н, 29Si ΠΈ газоТидкостной Ρ…Ρ€ΠΎΠΌΠ°Ρ‚ΠΎΠ³Ρ€Π°Ρ„ΠΈΠΈ. Π’ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π΅ ΠΏΡ€ΠΎΠ²Π΅Π΄Π΅Π½Π½Ρ‹Ρ… исслСдований выявлСны Ρ„Π°ΠΊΡ‚ΠΎΡ€Ρ‹, Π²Π»ΠΈΡΡŽΡ‰ΠΈΠ΅ Π½Π° Π½Π°ΠΏΡ€Π°Π²Π»Π΅Π½ΠΈΠ΅ Ρ€Π΅Π°ΠΊΡ†ΠΈΠΈ. Π’ зависимости ΠΎΡ‚ ΠΏΡ€ΠΈΡ€ΠΎΠ΄Ρ‹ растворитСля рСакция ΠΌΠΎΠΆΠ΅Ρ‚ Π±Ρ‹Ρ‚ΡŒ Π½Π°ΠΏΡ€Π°Π²Π»Π΅Π½Π° Π»ΠΈΠ±ΠΎ Π² сторону образования циклосилазана-1, Π»ΠΈΠ±ΠΎ циклосилазана-2. По своСй эффСктивности, ΠΎΠΏΡ€Π΅Π΄Π΅Π»Π΅Π½Π½ΠΎΠΉ ΠΊΠ°ΠΊ ΠΎΡ‚Π½ΠΎΡˆΠ΅Π½ΠΈΠ΅ циклосилазан-1/ циклосилазан-2, растворитСли ΠΌΠΎΠ³ΡƒΡ‚ Π±Ρ‹Ρ‚ΡŒ располоТСны Π² ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°Ρ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚ΠΈ: Π±Π΅Π½Π·ΠΈΠ½ Β«Π“Π°Π»ΠΎΡˆΠ°Β» > Π±Π΅Π½Π·ΠΈΠ½ Β«Π“Π°Π»ΠΎΡˆΠ°Β» + диэтиловый эфир (Π”Π­) > Π±Π΅Π½Π·ΠΈΠ½ «НСфраcΒ» + Π”Π­ > ΠΌΠ΅Ρ‚ΠΈΠ»Π΅Π½Ρ…Π»ΠΎΡ€ΠΈΠ΄ + Π”Π­ > Π±Π΅Π½Π·ΠΎΠ»
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