Search results for: K. Novakova

Items from 1 to 20 out of 27 results

chapter

Hybrid MPGD-based detectors of single photons for the upgrade of COMPASS RICH-1

M. Alexeev, R. Birsa, F. Bradamante, A. Bressan, more

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) > 1 - 5

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

A seven year-long R&D programme has been performed and the resulting detector architecture is a hybrid MPGD including two THick GEM (THGEM) multiplication stages followed a MICROMEGAS. The first THGEM board forms the photocathode support: its upper face is CsI coated. The properties of THGEM-based photocathodes have been studied in details. The two THGEM layers act as pre-amplification stages...

article

Retinoid compounds associated with water blooms dominated by Microcystis species

J. Javůrek, E. Sychrová, M. Smutná, M. Bittner, more

Harmful Algae > 2015 > 47 > Complete > 116-125

Retinoic acids play a critical role in vital physiological processes and vertebrate development, and their derivatives can be produced by some cyanobacterial species into surface waters. This study presents important environmentally-relevant information on total retinoid-like activity of field cyanobacterial biomasses and their surrounding waters. Intracellular and extracellular levels of total retinoid-like...

article

Azoospermia with variable testicular histology after 7 months of treatment with a deslorelin implant in toms

R. Novotny, R. Vitasek, A. Bartoskova, P. Cizek, more

Theriogenology > 2015 > 83 > 7 > 1188-1193

The main aim of the study was to assess whether the longer use of a GnRH-agonist implant (deslorelin 4.7 mg, Suprelorin) in toms would lead to the suppression of spermatogenesis comparable with histologic appearance in juvenile animals as was previously described in dogs. The other aims were to monitor the progression of the testes size decrease and development of azoospermia 5 to 7 months after treatment...

article

Status and progress of the novel photon detectors based on THGEM and hybrid MPGD architectures

M. Alexeev, R. Birsa, F. Bradamante, A. Bressan, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2014 > 766 > C > 133-137

We are developing large size THick GEM (THGEM)-based detectors of single photons, mainly meant for Cherenkov imaging applications. The R&D programme includes the complete characterisation of the THGEM electron multipliers, the study of the aspects related to the detection of single photons and the engineering towards large size detector prototypes. Our most recent achievements include dedicated...

article

THGEM-based photon detectors for the upgrade of COMPASS RICH-1

M. Alexeev, R. Birsa, F. Bradamante, A. Bressan, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 732 > Complete > 264-268

New Cherenkov photon detectors are being developed for the upgrade of COMPASS RICH-1. The detectors are based on THGEMs, arranged in a three layer architecture, with a CsI film on the first layer acting as a reflective photocathode. The response of THGEMs with various geometries under different conditions has been studied and photon detector prototypes have been built, tested in laboratory and operated...

article

Response of subfossil Cladocera in Gerzensee (Swiss Plateau) to early Late Glacial environmental change

K. Nováková, M. van Hardenbroek, W.O. van der Knaap

Palaeogeography, Palaeoclimatology, Palaeoecology > 2013 > 391 > Part B > 84-89

Sub-fossil Cladocera were studied in a core from Gerzensee (Swiss Plateau) for the late-glacial periods of Oldest Dryas, Bølling, and Allerød. Cladocera assemblages were dominated by cold-tolerant littoral taxa Chydorus sphaericus, Acroperus harpae, Alonella nana, Alona affinis, and Alonella excisa. The rapid warming at the beginning of the Bølling (GI-1e) ca. 14,650yr before present (BP: before AD...

article

Novel metabolites in cyanobacterium Cylindrospermopsis raciborskii with potencies to inhibit gap junctional intercellular communication

K. Nováková, J. Kohoutek, O. Adamovský, W. Brack, more

Journal of Hazardous Materials > 2013 > 262 > Complete > 571-579

Despite intensive research into toxic bloom-forming cyanobacteria, the majority of their metabolites remain unknown. The present study explored in detail a novel bioactivity identified in cyanobacteria, i.e. inhibition of gap junctional intercellular communication (GJIC), a marker of tumor promotion. The extracellular mixture (exudate) of the cyanobacterial strain Cylindrospermopsis raciborskii (SAG...

chapter

Development of large size photon detectors based on THGEM and hybrid MPGD architectures

F. Tessarotto, M. Alexeev, R. Birsa, F. Bradamante, more

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) > 1 - 8

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

Recent progress in the development of THGEM-based photon detectors confirm the validity of this novel technology. Detectors made of THGEMs, arranged in a three layer architecture, with a CsI coating on the first layer (acting as a reflective photocathode), have been produced and operated in laboratory and during test beam runs: they provide a gain of 105 and a time resolution better than 10 ns. Improvements...

article

Detection of single photons with THickGEM-based counters

M. Alexeev, F. Barbosa, R. Birsa, F. Bradamante, more

Nuclear Inst. and Methods in Physics Research, A > 2012 > 695 > Complete > 159-162

Cherenkov imaging counters requiring large photosensitive areas, the capability to stand high rates and to operate in magnetic field environments could benefit from the use of photon detectors based on THick Gaseous Electron Multiplier (THGEM) coupled to a solid state CsI photo-cathode.A systematic study of the THGEM detector response as a function of its geometrical parameters and electrodes' applied...

chapter

Thick GEM-based detectors of single photons for Cherenkov imaging applications

M. Alexeev, R. Birsa, F. Bradamante, A. Bressan, more

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) > 763 - 767

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC)

Photon detectors based on micropattern gas detectors represent a new generation of gaseous photon detectors. In the context of a project to upgrade the gas photon detectors of COMPASS RICH-1, we are performing an R&D programme aimed both to establish the principles and to develop the engineering aspects of photon detectors based on multi-layer arrangements of thick GEMs electron multipliers coupled...

chapter

Ion back flow reduction in a THGEM based detector

M. Alexeev, C. D. R. Azevedo, R. Birsa, F. Bradamante, more

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) > 1165 - 1171

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC)

Cherenkov imaging counters requiring large photo-sensitive areas, the capability to stand high rates and to operate in magnetic field environments could benefit from the use of micropattern gas detectors based on THick Gaseous Electron Multiplier (THGEM) coupled to a solid state CsI photo-cathode. Nevertheless, the ions produced in the charge multiplication processes, which end up in the CsI photocathode...

article

Estrogenic activity in extracts and exudates of cyanobacteria and green algae

E. Sychrová, T. Štěpánková, K. Nováková, L. Bláha, more

Environment International > 2012 > 39 > 1 > 134-140

Here is presented some of the first information on interactions of compounds produced by cyanobacteria and green algae with estrogen receptor signaling. Estrogenic potency of aqueous extracts and exudates (culture spent media with extracellular products) of seven species of cyanobacteria (10 different laboratory strains) and two algal species were assessed by use of in vitro trans-activation assays...

article

Development of THGEM-based Photon Detectors for COMPASS RICH-1

M. Alexeev, R. Birsa, F. Bradamante, A. Bressan, more

Physics Procedia > 2012 > 37 > Complete > 781-788

An R&D project is presented, aimed to develop a high performance gaseous detector of single photons, for the upgrade of the Ring Imaging Cherenkov Counter RICH-1 of the COMPASS Experiment at CERN SPS. The detector has to stably operate at high gain and high rate, to provide good time resolution and insensitivity to magnetic ﬁeld, and to offer the possibility to cover very large areas at affordable...

chapter

Application of piezoelectric macro-fiber-composite actuators for the suppression of noise transmission through curved glass plates

K. Novakova, P. Mokry

2011 International Symposium on Applications of Ferroelectrics (ISAF/PFM) and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials > 1 - 5

2011 Joint IEEE Int'l Symp on Applications of Ferroelectrics/Int'l Symp on Piezoresponse Force Microscopy & Nanoscale Phenomena in Polar Materials

An investigation on the application of the piezoelectric Macro-Fiber-Composite (MFC) actuators for the suppression of the noise transmission through the curved glass plates is presented. It is known that when the incident sound wave in the air hits the glass plate or curved plate or shell, part of the acoustic wave is reflected, which makes the plate vibrate, and part of the wave is transmitted. It...

article

Functional changes in the vanilloid receptor subtype 1 channel during and after acute desensitization

K. Novakova-Tousova, L. Vyklicky, K. Susankova, J. Benedikt, more

Neuroscience > 2007 > 149 > 1 > 144-154

Agonist-induced desensitization of the transient receptor potential vanilloid receptor-1 (TRPV1) is one of the key strategies that offer a way to alleviate neuropathic and inflammatory pain. This process is initiated by TRPV1 receptor activation and the subsequent entry of extracellular Ca ²⁺ through the channel into sensory neurones. One of the prominent mechanisms responsible for TRPV1 desensitization...

article

Palladium-catalyzed liquid-phase hydrogenation/hydrogenolysis of disulfides

Ekaterina K. Novakova, Leanne McLaughlin, Robbie Burch, Paul Crawford, more

Journal of Catalysis > 2007 > 249 > 1 > 93-101

For the first time, the hydrogenation/hydrogenolysis of a range of disulfides has been achieved over a supported palladium catalyst using hydrogen under relatively benign conditions. These unexpected results demonstrate that it is possible to avoid the poisoning of the catalyst by either the nitrogen-containing groups or the sulfur species, allowing both efficient reaction and recycling of the catalyst...

article

Affine invariant 2D recognition in grain classification

K. Novakova, J. Kukal

Archives of Control Sciences > 2007 > Vol. 17, no. 2 > 135-144

Invariant recognition of 2D binary image often arises from image moments. They enable the construction of affine transform, which ensures the invariance to translation, scaling, first rotation and stretching of the image. It is a problem to ensure the invariance to the second rotation. The paper deals with two methods how to realize the affine invariant recognition system with the numerical stable...

article

WINE-PRODUCERS IN THE REGION OF MALE KARPATY DURING FIRST HALF OF THE 20TH CENTURY

K. Novakova

Slovenský národopis (Slovak Ethnology) > 2007 > 55 > 3 > 265-291

The paper focuses on the culture of wine-producing in the specific micro-region within the wine-producing region of Male Karpaty. The authoress illuminates the attitudes, the wine-producers had towards the wine-producing, which was their main source of a substistence, towards their vineyards approached as the property and possible source of income. The paper explains how the wine-producers' year looked...

article

TRANSPORT AIDS AND CARRYING CARGOES AS A FORM OF EMPLOYMENT IN THE CONTEXT OF DEVELOPMENT OF TOURISM IN HIGH TATRAS

K. Novakova

Etnologické rozpravy (Ethnological Disputes) > 2007 > 14 > 2 > 85-108

The paper explores the forms of mountain and high-mountain transport on the Slovak side of the High Tatras since the time of the first mountain discoverers until the present day. It also examines the differences between particular historical periods in the terms of transportation and general model of organization of the high-mountain transport. The paper is based on the results of the field research,...

article

COLLECTIVISATION AND ITS INFLUENCE ON THE WINE PRODUCERS IN THE MICRO-REGION OF ORESANY

K. Novakova

Etnologické rozpravy (Ethnological Disputes) > 2006 > 13 > 2 > 62-80

The paper deals with the course and consequences of the collectivization of agriculture in the viticulture villages in the micro-region of Oresany, a part of the Little-Carpathian viticulture region. The authoress discusses the major problems concerning the wine producers as the persons, the process of uniting in the cooperatives, the activities of the particular agriculture cooperatives as well as...

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Search results for: K. Novakova

Hybrid MPGD-based detectors of single photons for the upgrade of COMPASS RICH-1

Retinoid compounds associated with water blooms dominated by Microcystis species

Azoospermia with variable testicular histology after 7 months of treatment with a deslorelin implant in toms

Status and progress of the novel photon detectors based on THGEM and hybrid MPGD architectures

THGEM-based photon detectors for the upgrade of COMPASS RICH-1

Response of subfossil Cladocera in Gerzensee (Swiss Plateau) to early Late Glacial environmental change

Novel metabolites in cyanobacterium Cylindrospermopsis raciborskii with potencies to inhibit gap junctional intercellular communication

Development of large size photon detectors based on THGEM and hybrid MPGD architectures

Detection of single photons with THickGEM-based counters

Thick GEM-based detectors of single photons for Cherenkov imaging applications

Ion back flow reduction in a THGEM based detector

Estrogenic activity in extracts and exudates of cyanobacteria and green algae

Development of THGEM-based Photon Detectors for COMPASS RICH-1

Application of piezoelectric macro-fiber-composite actuators for the suppression of noise transmission through curved glass plates

Functional changes in the vanilloid receptor subtype 1 channel during and after acute desensitization

Palladium-catalyzed liquid-phase hydrogenation/hydrogenolysis of disulfides

Affine invariant 2D recognition in grain classification

WINE-PRODUCERS IN THE REGION OF MALE KARPATY DURING FIRST HALF OF THE 20TH CENTURY

TRANSPORT AIDS AND CARRYING CARGOES AS A FORM OF EMPLOYMENT IN THE CONTEXT OF DEVELOPMENT OF TOURISM IN HIGH TATRAS

COLLECTIVISATION AND ITS INFLUENCE ON THE WINE PRODUCERS IN THE MICRO-REGION OF ORESANY

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