Search results for "STAR"

The Use of the Wavelet Approximation Signal as a Tool for the Diagnosis of Rotor Bar Failures

2005

[EN] The aim of this paper is to present a new approach for rotor bar failure diagnosis in induction machines. The method focuses on the study of an approximation signal resulting from the wavelet decomposition of the startup stator current. The presence of the left sideband harmonic is used as evidence of the rotor failure in most diagnosis methods based on the analysis of the stator current. Thus, a detailed description of the evolution of the left sideband harmonic during the startup transient is given in this paper; for this purpose, a method for calculating the evolution of the left sideband during the startup is developed, and its results are physically explained. This paper also show…

Patterns in Size and Shedding of Fasciola hepatica Eggs by Naturally and Experimentally Infected Murid Rodents

2002

Using samples collected on the island of Corsica, a comparative study was done of the morphometry of Fasciola hepatica eggs shed by cattle and by naturally and experimentally infected murid rodents (wild Mus musculus and Rattus rattus and Rattus norvegicus Wistar laboratory strain). Eggs shed by murids are smaller in size than those shed by naturally infected cattle. A second study analyzed the number of F. hepatica eggs shed in murid feces at different time intervals, i.e., months, days, and 6-hr periods, by the Kato-Katz technique. Both experimentally and naturally infected black rats (R. rattus) were used, and Wistar rats were experimentally infected and included for comparison. The pres…

A general procedure for the construction of Gorges polygons for multi-phase windings of electrical machines

2018

This paper presents a simple and effective procedure for the determination of the Gorges polygon, suitable for all possible winding configurations in electrical machines. This methodology takes into account the determination of a Winding Distribution Table (WDT), in which all the information about the distribution of the currents along the stator periphery is computed and from which the Görges polygon are easily derived. The proposed method can be applied to both symmetrical and asymmetrical multi-phase windings, including concentrated, fractional, reduced and dead-coil ones. The examples provided in this paper demonstrate the versatility of the proposed method.

Scaling theory for radial distributions of star polymers in dilute solution in the bulk and at a surface, and scaling of polymer networks near the ad…

1991

Monomer density profiles ρ(r) and center–end distribution functions g(rCE) of star polymers are analyzed by using a scaling theory in arbitrary dimensions d, considering dilute solutions and the good solvent limit. Both the case of a free star in the bulk and of a center‐adsorbed star at a free surface are considered. In the latter case of a semi‐infinite problem, a distinction is made between repulsive walls, attractive walls—where for large arm length l the configuration of the star is quasi‐(d−1) dimensional—, and ‘‘marginal walls’’ where for l→∞ the transition from d‐dimensional structure occurs. For free stars, ρ(r) behaves as r−d+1/ν for small r, where ν is the exponent describing the…

Monte Carlo simulation of many-arm star polymers in two-dimensional good solvents in the bulk and at a surface

1991

A Monte Carlo technique is proposed for the simulation of statistical properties of many-arm star polymers on lattices. In this vectorizing algorithm, the length of each arml is increased by one, step by step, from a starting configuration withl=1 orl=2 which is generated directly. This procedure is carried out for a large sample (e.g., 100,000 configurations). As an application, we have studied self-avoiding stars on the square lattice with arm lengths up tol max=125 and up tof=20 arms, both in the bulk and in the geometry where the center of the star is adsorbed on a repulsive surface. The total number of configurations, which behaves asN∼l γ G–1μ fl , whereμ=2.6386 is the usual effective…

Izplatīta starpniekserveru sistēma

2018

Darbā ir aprakstīta izplatīta starpniekserveru sistēma, kas balstās uz Docker konteineriem un Ansible Playbook skriptiem. Darba mērķis bija izpētīt dažādus starpniekserveru veidus un nākt klajā ar risinājumu, kuru varētu savietot jau ar esošo sistēmu, kas ir izvietota uz mākoņserveriem. Tika iepazīta Docker platforma, un tās izmantošana lietojumprogrammu konteinerizēšanai, kā arī Ansible automatizācijas risinājumi. Attiecīgi pēc izvirzītajām prasībām tika konfigurēts HTTP starpniekserveris, kas tika konteinerizēts ar Docker un izvietots uz mākoņserveriem ar Ansible Playbook skriptiem.

Schema theory: A new approach?

1987

Agro jauno laiku Rīgas kapsētu apbedījumu izpēte ar senās DNS analīzēm: nozīmīgākās pieejas un izpētes perspektīvas

2020

Bakalaura darba mērķis ir noskaidrot, kā ar senās DNS analīžu palīdzību ir iespējams papildināt jau esošās zināšanas, kas iegūtas ar tādām pētniecības metodēm kā literatūras un avotu analīze, kā arī arheoloģijas metodēm, kā piemēru izmantojot konkrētus agro jauno laiku Rīgas apbedījumus. Darba ietvaros tika veikta senās DNS izdalīšana un analīze, kuras rezultāti sasaistīti ar apbedījumu arheoloģisko un vēsturisko kontekstu, tādejādi izvirzot populāciju ģenētikas teorijā balstītas hipotēzes par konkrēto indivīdu izcelsmi. Darba rezultātā noteikta aptuvena izcelsme no mātes puses trijiem un dzimums visiem sešiem no pētāmajiem indivīdiem. Apbedītajiem konstatēti dažādi izcelsmes reģioni, kas a…

Effects of escitalopram on the regulation of brain-derived neurotrophic factor and nerve growth factor protein levels in a rat model of chronic stres…

2009

Escitalopram (ES-CIT) is a widely used, highly specific antidepressant. Until now there has been very little evidence on how this drug under pathological conditions affects an important feature within the pathophysiology of stress-related disorders such as depression: the endogenous neurotrophins. By using a well-characterized rat model in which chronic stress induces depressive-like behavior, the levels of neurotrophins brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) were determined in representative brain regions and serum using a highly sensitive improved fluorometric two-site ELISA system. There was a significant increase of BDNF in the left and right cortices aft…

Mediācijas darbības izvērtējums un tālākās attīstības iespējas.

2020

Bakalaura darbs “Mediācijas darbības izvērtējums un tālākās attīstības iespējas” ir veltīts mediācijas ieviešanai Latvijā, šīs ieviešanas izvērtējumam, mediācijas darbības apskatam un rezultātiem, kā arī turpmākām mediācijas ieviešanas, skaidrošanas un attīstības iespējām. Darba tēmas nozīmīgums izriet no autora ieskatā būtiskām mediācijas priekšrocībām salīdzinājumā ar citām konfliktu un strīdu risināšanas metodēm. Tā kā mediācijas institūts Latvijā ir salīdzinoši jauns, sabiedrības izpratne par to vēl ir maza, un uzticēšanās tam vēl ir zemā līmenī. Šajā pētījumā aplūkotie statistikas dati pierāda autora tēzi, ka mediācijas turpmāka attīstība ir atkarīga no sabiedrības informēšanas par med…