Isothermal Section of the V-Si-B System at 1600 A degrees C in the V-VSi(2)-VB Region

In recent years, the Me-Si-B (Me-metal) ternary systems have received considerable attention aiming at the development of high-temperature structural materials. Assuming that any real application of these materials will rely on multicomponent alloys, as is the case of Ni-base superalloys, phase equilibria data of these systems become very important. In this work, results are reported on phase equilibria in the V-Si-B system, and are summarized in the form of an isothermal section at 1600 A degrees C for the V-VSi(2)-VB region. Several alloys of different compositions were prepared via arc melting and then heat-treated at 1600 A degrees C under high vacuum. All the materials in both as-cast and heat-treated conditions were characterized through x-ray diffraction, scanning electron microscopy, and selected alloys via wavelength dispersive spectroscopy. A negligible solubility of B in the V(3)Si, V(5)Si(3) (T(1)), and V(6)Si(5) phases as well as of Si in V(3)B(2) and VB phases was noted. Two ternary phases presenting the structures known as T(2) (Cr(5)B(3)-prototype) and D8(8) (Mn(5)Si(3)-prototype) were observed in both as-cast and heat-treated samples. It is proposed that at 1600 A degrees C the homogeneity range of T(2) extends approximately from 5 at.% to 12 at.% Si at constant vanadium content and the composition of D8(8) phase is close to V(59.5)Si(33)B(7.5) (at.%).

Detection and diagnosis solutions for fault-tolerant VSI

This paper presents solutions for fault detection and diagnosis of two-level, three phase voltage-source inverter (VSI) topologies with IGBT devices. The proposed solutions combine redundant standby VSI structures and contactors (or relays) to improve the fault-tolerant capabilities of power electronics in applications with safety requirements. The suitable combination of these elements gives the inverter the ability to maintain energy processing in the occurrence of several failure modes, including short-circuit in IGBT devices, thus extending its reliability and availability. A survey of previously developed fault-tolerant VSI structures and several aspects of failure modes, detection and isolation mechanisms within VSI is first discussed. Hardware solutions for the protection of power semiconductors with fault detection and diagnosis mechanisms are then proposed to provide conditions to isolate and replace damaged power devices (or branches) in real time. Experimental results from a prototype are included to validate the proposed solutions.

Urochnyi a polozhenii a na vsi e voobshche raboty, proizvodi a shchii a si a pri kri e posti a kh, grazhdanskikh zdanii a kh i gidrotekhnicheskikh sooruzhenii a kh.

Mode of access: Internet.

Tak govoril Zaratustra; kniga dli︠a︡ vsi︠e︡kh i ni dli︠a︡ kogo.

Translation of his Also sprach Zarathustra.

Dissertazione di polizia medica sul Pentateuco in riguardo alle leggi spettanti alla grauidanza, al parto, puerperio, all'educazione della fanciullezza, ed ai patemi di animo con molte riflessioni filosofiche sui rabbinici commenti, ed vsi ebraici in tale materia /

Mode of access: Internet.

Nastolʹnyĭ slovarʹ dli︠a︡ spravok po vsi︠e︡m otrasli︠a︡m znanīi︠a︡. (Spravochnyĭ ėnt︠s︡iklopedicheskīĭ leksikon) v III tomakh.

Vol. 3, "Sostavlennyĭ pod redakt︠s︡ěi︠u︡ V.P. Zotova i F. Tolli︠a︡."

Malenʹkīĭ russkīĭ: Posobīe dli︠a︡ dalʹni︠e︡ĭshago usovershenstvovanīi︠a︡ v russkom i︠a︡zyki︠e︡ dli︠a︡ lit︠s︡, zhelai︠u︡shchikh svobodno vladi︠e︡tʹ zhivoi︠u︡ razgovornoi︠u︡ ri︠e︡chʹi︠u︡ vo vsi︠e︡kh sluchai︠a︡kh obikhodnoĭ zhizni ... S planom S.-Peterburga.

Added title page in German, French, English, Italian and Spanish.

Bolʹshai︠a︡ ėnt︠s︡iklopedīi︠a︡ : slovarʹ obshchedostupnykh svi︠e︡di︠e︡nīĭ po vsi︠e︡m otrasli︠a︡m znanīi︠a︡ /

t. 1. A-Arbos.--t. 2. Arbua de Zhi︠u︡bėnvilʹ-Bellingsgauzen.--t. 3. Belling-Bugulʹnik.--t. 4. Buguruslanskīĭ ui︠e︡zd-Vizantīĭskoe pravo.--t. 5. Vizantīi︠a︡-Gadames.--t. 6. Gadanīe-Glazchatka.--t. 7. Glaz-Gi︠u︡go.--t. 8. Gi︠u︡gs-Dukhovenstvo.--t. 9. Dukhovenstvo-Idskoe pole.--t. 10. Idumėi︠a︡-Kitchener.--t. 11. Kity-Landana.--t. 12. Landau-Melamed.--t. 13. Melanezīĭt︠s︡y-Nerchinskīĭ zavod.--t. 14. Nerchinskīĭ okrug-Pench.--t. 15. Penʹka-Pulʹ.--t. 16. Pulʹ-Salʹ.--t. 17. Salʹvador-Statistika.--t. 18. Statistika-Undozero.--t. 19. Undolʹskīĭ-Chakhary.--t. 20. Chakhotka legkikh-V.--t. 21. (Dopolnitelʹnyĭ) Aanrud-Menger.--t. 22. (Dopolnitelʹnyĭ) Mendelʹson-Ḟrazibul.

Pami︠a︡tnik Vostochnoĭ voĭny, 1877-1878 gg. : zakli︠u︡chai︠u︡shchīĭ v sebi︠e︡ v alfavitnom pori︠a︡dki︠e︡ bīograficheskīe ocherki vsi︠e︡kh otlichivshikhsi︠a︡, ubitykh, ranenykh i kontuzhennykh generalov, shtab i ober ofit︠s︡erov, doktorov, sanitarov, sester miloserdīi︠a︡ i otlichivshikhsi︠a︡ ri︠a︡dovykh /

Mode of access: Internet.

Ukazatelʹ ko vsi︠e︡m perīodicheskim izdanīi︠a︡m Obshchestva istorīi i drevnosteĭ rossīĭskikh pri imperatorskom Moskovskom universiteti︠e︡ : 1815-1883 gg.

Mode of access: Internet.

Chetyre vozrasta zhizni, podarok vsi︠e︡m vozrastam /

Mode of access: Internet.

Bolʹshai͡a︡ ėnt͡s︡iklopedīi͡a︡ : slovarʹ obshchedostupnykh svi͡e︡di͡e︡nīĭ po vsi͡e︡m otrasli͡a︡m znanīi͡a︡ /

Mode of access: Internet.

Polnyĭ sbornik platform vsi︠e︡kh russkikh politicheskikh partīĭ s prilozhenīem Vysochaĭshago Manifesta 17 Okti︠a︡bri︠a︡ 1905 g. i vsepoddanni︠e︡ĭshago doklada grafa Vitte. Ispravleny i dopolneny po posli︠e︡dnim rezoli︠u︡t︠s︡īi︠a︡m partīĭnykh sʺezdov.

Cover-title.

Applying discrete element modelling to vertical and horizontal shaft impact crushers

The PFC3D (particle flow code) that models the movement and interaction of particles by the DEM techniques was employed to simulate the particle movement and to calculate the velocity and energy distribution of collision in two types of impact crusher: the Canica vertical shaft crusher and the BJD horizontal shaft swing hammer mill. The distribution of collision energies was then converted into a product size distribution for a particular ore type using JKMRC impact breakage test data. Experimental data of the Canica VSI crusher treating quarry and the BJD hammer mill treating coal were used to verify the DEM simulation results. Upon the DEM procedures being validated, a detailed simulation study was conducted to investigate the effects of the machine design and operational conditions on velocity and energy distributions of collision inside the milling chamber and on the particle breakage behaviour. (C) 2003 Elsevier Ltd. All rights reserved.

Aurícula direita: mecânica e sobrecarga de volume

Mestrado em Tecnologia de Diagnóstico e Intervenção Cardiovascular - Ramo de especialização: Ultrassonografia Cardiovascular