68 research outputs found
New Exact Solutions of a Generalized Shallow Water Wave Equation
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
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
ΠΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΡΡ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΡ
Π¦Π΅Π»ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΡΡ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΡ ΠΊΠ°ΠΊ ΠΈΠ½ΡΠ΅Π³ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Ρ, ΡΠΎ Π΅ΡΡΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΠΎΠ²ΠΎΠΊΡΠΏΠ½ΠΎΡΡΡΡ Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΠ΅ΠΉ, ΡΠ°ΠΊΠΈΡ
ΠΊΠ°ΠΊ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅Π½Π½Π°Ρ, ΠΈΠ½Π²Π΅ΡΡΠΈΡΠΈΠΎΠ½Π½Π°Ρ, ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½Π°Ρ, ΠΌΠ°ΡΠΊΠ΅ΡΠΈΠ½Π³ΠΎΠ²Π°Ρ ΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²Π°Ρ
Desenvolvimento de classes e unidades geo-pedológicas a partir da interação entre a pedologia e a geotecnia.
Por considerarem informaçáes compreendendo caracterΓsticas do meio fΓsico, descriçáes de perfis e propriedades morfolΓ³gicas, quΓmicas, fΓsicas e mineralΓ³gicas, trabalhos de mapeamentos de solos desenvolvidos dentro do contexto pedolΓ³gico propiciam informaçáes relevantes de carΓ‘ter geolΓ³gico-geotΓ©cnico. PorΓ©m, possivelmente em virtude do grau de especialização e por nΓ£o envolverem dados que permitam uma adequada inferΓͺncia de condiçáes provΓ‘veis do subsolo, tais informaçáes podem nΓ£o ser plenamente entendidas na prΓ‘tica da engenharia. Dentro deste contexto, o presente artigo tem como objetivo relacionar informaçáes contidas em trabalhos de levantamentos de solos passΓveis de serem utilizadas como indicadores relevantes a atividades geolΓ³gico-geotΓ©cnicas e propor o desenvolvimento de unidades geo-pedolΓ³gicas de classificação de solos. Assim, sΓ£o desenvolvidas correlaçáes entre as caracterΓsticas pedolΓ³gicas das 13 classes de solos que ocorrem no territΓ³rio brasileiro, com os respectivos significados geotΓ©cnicos. Legendas de abrangΓͺncia geral sΓ£o propostas, definindo unidades de solos dentro de um contexto geo-pedolΓ³gico
Π£ΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΡ Π½ΠΈΠΊΠ΅Π»Π΅Π²ΡΡ ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΡΡ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ² ΠΌΠ΅ΡΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ Π°Π±ΡΠΎΡΠ±Π΅Π½ΡΠΎΠ² ΡΠ΄Π°Π»Π΅Π½ΠΈΡ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° ΠΈΠ· ΡΠΈΠ½ΡΠ΅Π·-Π³Π°Π·Π°
We report the results of studies on the influences of the organic carbon dioxide absorbent β aqueous solution of activated methyldiethanolamine (MDEA) β 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) itβs 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.ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π±ΡΠΎΡΠ±Π΅Π½ΡΠ° Π² Π²ΠΈΠ΄Π΅ Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ²ΠΎΡΠ° Π°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΈΠ»Π΄ΠΈΡΡΠ°Π½ΠΎΠ»Π°ΠΌΠΈΠ½Π° (ΠΠΠΠ), ΡΠ²Π»ΡΡΡΠ΅Π³ΠΎΡΡ Π°Π±ΡΠΎΡΠ±Π΅Π½ΡΠΎΠΌ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° ΠΏΡΠΈ Π΅Π³ΠΎ ΡΠ΄Π°Π»Π΅Π½ΠΈΠΈ ΠΈΠ· Π°Π·ΠΎΡΠΎ-Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Π½ΠΎΠΉ ΡΠΌΠ΅ΡΠΈ, Π½Π° ΡΠΈΠ·ΠΈΠΊΠΎ-Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ Π½ΠΈΠΊΠ΅Π»ΡΠ°Π»ΡΠΌΠΈΠ½ΠΈΠ΅Π²ΠΎΠ³ΠΎ ΠΌΠ°ΡΠΊΠΈ ΠΠΠΠ-07-01 (ΠΠΠ-1) ΠΈ ΡΠ΅ΠΌΠ΅Π½ΡΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ
ΠΌΠ°ΡΠΊΠΈ ΠΠΠΠ-07-07 (ΠΠΠ-7), Meth-134 ΠΈ Meth-135 ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ² Π³ΠΈΠ΄ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΎΠΊΡΠΈΠ΄ΠΎΠ² ΡΠ³Π»Π΅ΡΠΎΠ΄Π° (ΠΌΠ΅ΡΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ). Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π½ΠΈΠΊΠ΅Π»ΡΠ°Π»ΡΠΌΠΈΠ½ΠΈΠ΅Π²ΡΠ΅ ΠΈ Π½ΠΈΠΊΠ΅Π»ΡΡΠ΅ΠΌΠ΅Π½ΡΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠ΅ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΡ, ΠΏΠΎΠ΄Π²Π΅ΡΠ³Π½ΡΡΡΠ΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΈΠ»Π΄ΠΈΡΡΠ°Π½ΠΎΠ»Π°ΠΌΠΈΠ½Π° (ΠΠΠΠ), Π²ΠΎΡΡΡΠ°Π½Π°Π²Π»ΠΈΠ²Π°ΡΡ ΡΠ²ΠΎΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΠ΅ ΠΈ ΠΊΠ°ΡΠ°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π°. ΠΠ»Ρ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΡΠΊΡΠΏΠ»ΡΠ°ΡΠ°ΡΠΈΠΈ ΠΌΠ΅ΡΠ°Π½Π°ΡΠΎΡΠ° ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΠ΅ΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½ΡΡΡ Π½ΠΎΠ²ΡΠΉ Π½ΠΈΠΊΠ΅Π»Π΅Π²ΡΠΉ ΡΠ΅ΠΌΠ΅Π½ΡΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠΉ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡ ΠΌΠ°ΡΠΊΠΈ ΠΠΠΠ-07-07 (ΠΠΠ-7), ΠΊΠΎΡΠΎΡΡΠΉ ΠΌΠΎΠΆΠ΅Ρ ΠΈΠ·Π³ΠΎΡΠ°Π²Π»ΠΈΠ²Π°ΡΡΡΡ Π² Π²ΠΈΠ΄Π΅ ΡΠ°Π±Π»Π΅ΡΠΎΠΊ, ΠΊΠΎΠ»Π΅Ρ ΠΈΠ»ΠΈ ΡΠΊΡΡΡΡΠ΄Π°ΡΠΎΠ²
Π£ΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΡ Π½ΠΈΠΊΠ΅Π»Π΅Π²ΡΡ ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΡΡ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ² ΠΌΠ΅ΡΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ Π°Π±ΡΠΎΡΠ±Π΅Π½ΡΠΎΠ² ΡΠ΄Π°Π»Π΅Π½ΠΈΡ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° ΠΈΠ· ΡΠΈΠ½ΡΠ΅Π·-Π³Π°Π·Π°
Received: 16.06.2017; accepted: 06.09.2017; published: 20.10.2017.ΠΠΎΡΡΡΠΏΠΈΠ»ΠΎ: 16.06.2017; ΠΏΡΠΈΠ½ΡΡΠΎ: 06.09.2017; ΠΎΠΏΡΠ±Π»ΠΈΠΊΠΎΠ²Π°Π½ΠΎ: 20.10.2017.We report the results of studies on the influences of the organic carbon dioxide absorbent β aqueous solution of activated methyldiethanolamine (MDEA) β 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) itβs 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.ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π±ΡΠΎΡΠ±Π΅Π½ΡΠ° Π² Π²ΠΈΠ΄Π΅ Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ²ΠΎΡΠ° Π°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΈΠ»Π΄ΠΈΡΡΠ°Π½ΠΎΠ»Π°ΠΌΠΈΠ½Π° (ΠΠΠΠ), ΡΠ²Π»ΡΡΡΠ΅Π³ΠΎΡΡ Π°Π±ΡΠΎΡΠ±Π΅Π½ΡΠΎΠΌ Π΄ΠΈΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° ΠΏΡΠΈ Π΅Π³ΠΎ ΡΠ΄Π°Π»Π΅Π½ΠΈΠΈ ΠΈΠ· Π°Π·ΠΎΡΠΎ-Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Π½ΠΎΠΉ ΡΠΌΠ΅ΡΠΈ, Π½Π° ΡΠΈΠ·ΠΈΠΊΠΎ-Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ Π½ΠΈΠΊΠ΅Π»ΡΠ°Π»ΡΠΌΠΈΠ½ΠΈΠ΅Π²ΠΎΠ³ΠΎ ΠΌΠ°ΡΠΊΠΈ ΠΠΠΠ-07-01 (ΠΠΠ-1) ΠΈ ΡΠ΅ΠΌΠ΅Π½Ρ-ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ
ΠΌΠ°ΡΠΊΠΈ ΠΠΠΠ-07-07 (ΠΠΠ-7), Meth-134 ΠΈ Meth-135 ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠΎΠ² Π³ΠΈΠ΄ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΎΠΊΡΠΈΠ΄ΠΎΠ² ΡΠ³Π»Π΅ΡΠΎΠ΄Π° (ΠΌΠ΅ΡΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ). Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π½ΠΈΠΊΠ΅Π»ΡΠ°Π»ΡΠΌΠΈΠ½ΠΈΠ΅Π²ΡΠ΅ ΠΈ Π½ΠΈΠΊΠ΅Π»ΡΡΠ΅ΠΌΠ΅Π½ΡΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠ΅ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΡ, ΠΏΠΎΠ΄Π²Π΅ΡΠ³Π½ΡΡΡΠ΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΈΠ»Π΄ΠΈΡΡΠ°Π½ΠΎΠ»Π°ΠΌΠΈΠ½Π° (ΠΠΠΠ), Π²ΠΎΡΡΡΠ°Π½Π°Π²Π»ΠΈΠ²Π°ΡΡ ΡΠ²ΠΎΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΠ΅ ΠΈ ΠΊΠ°ΡΠ°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π°. ΠΠ»Ρ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΡΠΊΡΠΏΠ»ΡΠ°ΡΠ°ΡΠΈΠΈ ΠΌΠ΅ΡΠ°Π½Π°ΡΠΎΡΠ° ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΠ΅ΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½ΡΡΡ Π½ΠΎΠ²ΡΠΉ Π½ΠΈΠΊΠ΅Π»Π΅Π²ΡΠΉ ΡΠ΅ΠΌΠ΅Π½ΡΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠΉ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡ ΠΌΠ°ΡΠΊΠΈ ΠΠΠΠ-07-07
(ΠΠΠ-7), ΠΊΠΎΡΠΎΡΡΠΉ ΠΌΠΎΠΆΠ΅Ρ ΠΈΠ·Π³ΠΎΡΠ°Π²Π»ΠΈΠ²Π°ΡΡΡΡ Π² Π²ΠΈΠ΄Π΅ ΡΠ°Π±Π»Π΅ΡΠΎΠΊ, ΠΊΠΎΠ»Π΅Ρ ΠΈΠ»ΠΈ ΡΠΊΡΡΡΡΠ΄Π°ΡΠΎΠ²
A checklist of native freshwater fish from Brantas River, East Java, Indonesia
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
ΠΡΠ΅Π΄ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠΎΠ½ΠΎΠΌΠ΅ΡΡ Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π½ΠΈΡΡΠΈΠ΄Π° ΠΈ ΠΊΠ°ΡΠ±ΠΎΠ½ΠΈΡΡΠΈΠ΄Π° ΠΊΡΠ΅ΠΌΠ½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Ρ ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΡΠ°ΠΆΠ΄Π΅Π½ΠΈΡ ΠΈΠ· Π³Π°Π·ΠΎΠ²ΠΎΠΉ ΡΠ°Π·Ρ
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 1Π, 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’ΡΠΈ(N-ΠΌΠ΅ΡΠΈΠ»)ΡΡΠΈΠΌΠ΅ΡΠΈΠ»ΡΠΈΠΊΠ»ΠΎΡΡΠΈΡΠΈΠ»Π°Π·Π°Π½ (ΡΠΈΠΊΠ»ΠΎΡΠΈΠ»Π°Π·Π°Π½-1) ΠΈ ΡΠ΅ΡΡΠ°(N-ΠΌΠ΅ΡΠΈΠ»)ΡΠ΅ΡΡΠ°ΠΌΠ΅ΡΠΈΠ»-ΡΠΈΠΊΠ»ΠΎΡΠ΅ΡΡΠ°ΡΠΈΠ»Π°Π·Π°Π½ (ΡΠΈΠΊΠ»ΠΎΡΠΈΠ»Π°Π·Π°Π½-2), ΡΠ²Π»ΡΡΡΠΈΠ΅ΡΡ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΌΠΈ ΠΏΡΠ΅Π΄ΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΌΠΎΠ½ΠΎ-ΠΌΠ΅ΡΠ°ΠΌΠΈ Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΠΎΠΊΠΈΡΠ»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΎΠΉΠΊΠΈΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ°ΡΡΠΈΡ ΠΊΠΎΠΌ-ΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π½ΠΈΡΡΠΈΠ΄Π°, ΠΊΠ°ΡΠ±ΠΎΠ½ΠΈΡΡΠΈΠ΄Π° ΠΊΡΠ΅ΠΌΠ½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΡΠ°ΠΆΠ΄Π΅Π½ΠΈΡ ΠΈΠ· Π³Π°Π·ΠΎΠ²ΠΎΠΉ ΡΠ°Π·Ρ, Π±ΡΠ»ΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π°ΠΌΠΈΠ½ΠΎΠ»ΠΈΠ·ΠΎΠΌ ΠΌΠ΅ΡΠΈΠ»Π΄ΠΈΡ
Π»ΠΎΡΡΠΈΠ»Π°Π½Π°, Π²ΡΠ΄Π΅Π»Π΅Π½Ρ ΠΈ ΠΎΡ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°Π½Ρ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ Π―ΠΠ 1Π, 29Si ΠΈ Π³Π°Π·ΠΎΠΆΠΈΠ΄ΠΊΠΎΡΡΠ½ΠΎΠΉ Ρ
ΡΠΎΠΌΠ°ΡΠΎΠ³ΡΠ°ΡΠΈΠΈ. Π ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π²ΡΡΠ²Π»Π΅Π½Ρ ΡΠ°ΠΊΡΠΎΡΡ, Π²Π»ΠΈΡΡΡΠΈΠ΅ Π½Π° Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΡΠ΅Π°ΠΊΡΠΈΠΈ. Π Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΠΏΡΠΈΡΠΎΠ΄Ρ ΡΠ°ΡΡΠ²ΠΎΡΠΈΡΠ΅Π»Ρ ΡΠ΅Π°ΠΊΡΠΈΡ ΠΌΠΎΠΆΠ΅Ρ Π±ΡΡΡ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π° Π»ΠΈΠ±ΠΎ Π² ΡΡΠΎΡΠΎΠ½Ρ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠΊΠ»ΠΎΡΠΈΠ»Π°Π·Π°Π½Π°-1, Π»ΠΈΠ±ΠΎ ΡΠΈΠΊΠ»ΠΎΡΠΈΠ»Π°Π·Π°Π½Π°-2. ΠΠΎ ΡΠ²ΠΎΠ΅ΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ, ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΠΎΠΉ ΠΊΠ°ΠΊ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΡΠΈΠΊΠ»ΠΎΡΠΈΠ»Π°Π·Π°Π½-1/ ΡΠΈΠΊΠ»ΠΎΡΠΈΠ»Π°Π·Π°Π½-2, ΡΠ°ΡΡΠ²ΠΎΡΠΈΡΠ΅Π»ΠΈ ΠΌΠΎΠ³ΡΡ Π±ΡΡΡ ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Ρ Π² ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ: Π±Π΅Π½Π·ΠΈΠ½ Β«ΠΠ°Π»ΠΎΡΠ°Β» > Π±Π΅Π½Π·ΠΈΠ½ Β«ΠΠ°Π»ΠΎΡΠ°Β» + Π΄ΠΈΡΡΠΈΠ»ΠΎΠ²ΡΠΉ ΡΡΠΈΡ (ΠΠ) > Π±Π΅Π½Π·ΠΈΠ½ Β«ΠΠ΅ΡΡΠ°cΒ» + ΠΠ > ΠΌΠ΅ΡΠΈΠ»Π΅Π½Ρ
Π»ΠΎΡΠΈΠ΄ + ΠΠ > Π±Π΅Π½Π·ΠΎΠ»
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