Modelling and control of a seven level NPC voltage source inverter. Application to high power induction machine drive
作者:H. Gheraia、E. M. Berkouk、G. Manesse
DOI:10.1051/epjap:2001172
日期:2001.8
In this paper, we study a new kind of continuous-alternating converters: a seven-level neutral point clamping (NPC) voltage source inverter (VSI). We propose this inverter for applications in high voltage and high power fields. In the first part, we develop the knowledge and the control models of this inverter using the connections functions of the semi-conductors. After that, we present two pulse width modulation (PWM) algorithms to control this converter using its control model. We propose these algorithms for digital implementation. This multilevel inverter is associated to the induction machine. The performances obtained are full of promise to use it in the high voltage and high power fields of electrical traction.
ACID-LABILE ESTER MONOMER HAVING SPIROCYCLIC STRUCTURE, POLYMER, RESIST COMPOSITION, AND PATTERNING PROCESS
申请人:Kinsho Takeshi
公开号:US20100304295A1
公开(公告)日:2010-12-02
An acid-labile ester monomer of spirocyclic structure has formula (1) wherein Z is a monovalent group having a polymerizable double bond, X is a divalent group which forms a cyclopentane, cyclohexane or norbornane ring, R
2
is H or monovalent hydrocarbon, R
3
and R
4
are H or monovalent hydrocarbon, or R
3
and R
4
, taken together, stand for a divalent group which forms a cyclopentane or cyclohexane ring, and n is 1 or 2. A polymer obtained from the acid-labile ester monomer has so high reactivity in acid-catalyzed elimination reaction that the polymer may be used to formulate a resist composition having high resolution.
Microwave dielectric relaxation of ferroelectric PLZT ceramics in the range of 300-900 K
作者:A. Mouhsen、M. E. Achour、J. L. Miane、J. Ravez
DOI:10.1051/epjap:2001171
日期:2001.8
Dielectric response of PLZT(x/65/35) ceramics (with x = 0, 2, 4, 5) was studied using radio frequency and microwave techniques in the temperature range 300−900 K and with a frequency range of 102 Hz-3 × 109 Hz. Dielectric relaxation appears around 1 × 109 Hz at room temperature. The relaxation frequency softens at Tc and the dielectric relaxation exists in both paraelectric and ferroelectric phases and depends on x the lanthanum concentration. A model of correlation chains gives some keys for understanding the frequency behaviour of such materials.
An Aromas kit uses containers of certain discrete molecules to provide odors suitable for an olfactory education of wine properties. The disclosed molecules may be found within certain wines and provide a useful olfactory reference when smelling a finished wine sample, even when the wine sample contains a myriad of other conflicting or competing molecule smells.
[EN] PROCESS FOR THE PREPARATION OF BRIVARACETAM<br/>[FR] PROCÉDÉ DE PRÉPARATION DE BRIVARACÉTAM
申请人:GLENMARK LIFE SCIENCES LTD
公开号:WO2021124066A1
公开(公告)日:2021-06-24
The present invention relates to a process for the preparation of brivaracetam, a compound of formula I and salts thereof. The present invention also relates to a compound of formula II and a compound of formula IIA, process for its preparation and conversion thereof to brivaracetam, the compound of formula I.