13 results on '"Dobrescu, Constantin"'
Search Results
2. Honey bee colony loss rates in 37 countries using the COLOSS survey for winter 2019–2020: the combined effects of operation size, migration and queen replacement
- Author
-
Gray, Alison, Adjlane, Noureddine, Arab, Alireza, Ballis, Alexis, Brusbardis, Valters, Bugeja Douglas, Adrian, Cadahía, Luis, Charrière, Jean-Daniel, Chlebo, Robert, Coffey, Mary F., Cornelissen, Bram, Costa, Cristina Amaro da, Danneels, Ellen, Danihlík, Jiří, Dobrescu, Constantin, Evans, Garth, Fedoriak, Mariia, Forsythe, Ivan, Gregorc, Aleš, Ilieva Arakelyan, Iliyana, Johannesen, Jes, Kauko, Lassi, Kristiansen, Preben, Martikkala, Maritta, Martín-Hernández, Raquel, Mazur, Ewa, Medina-Flores, Carlos Aurelio, Mutinelli, Franco, Omar, Eslam M., Patalano, Solenn, Raudmets, Aivar, San Martin, Gilles, Soroker, Victoria, Stahlmann-Brown, Philip, Stevanović, Jevrosima, Uzunov, Aleksandar, Vejsnaes, Flemming, Williams, Anthony, Brodschneider, Robert, Gray, Alison, Adjlane, Noureddine, Arab, Alireza, Ballis, Alexis, Brusbardis, Valters, Bugeja Douglas, Adrian, Cadahía, Luis, Charrière, Jean-Daniel, Chlebo, Robert, Coffey, Mary F., Cornelissen, Bram, Costa, Cristina Amaro da, Danneels, Ellen, Danihlík, Jiří, Dobrescu, Constantin, Evans, Garth, Fedoriak, Mariia, Forsythe, Ivan, Gregorc, Aleš, Ilieva Arakelyan, Iliyana, Johannesen, Jes, Kauko, Lassi, Kristiansen, Preben, Martikkala, Maritta, Martín-Hernández, Raquel, Mazur, Ewa, Medina-Flores, Carlos Aurelio, Mutinelli, Franco, Omar, Eslam M., Patalano, Solenn, Raudmets, Aivar, San Martin, Gilles, Soroker, Victoria, Stahlmann-Brown, Philip, Stevanović, Jevrosima, Uzunov, Aleksandar, Vejsnaes, Flemming, Williams, Anthony, and Brodschneider, Robert
- Abstract
This article presents managed honey bee colony loss rates over winter 2019/20 resulting from using the standardised COLOSS questionnaire in 37 countries. Six countries were from outside Europe, including, for the first time in this series of articles, New Zealand. The 30,491 beekeepers outside New Zealand reported 4.5% of colonies with unsolvable queen problems, 11.1% of colonies dead after winter and 2.6% lost through natural disaster. This gave an overall colony winter loss rate of 18.1%, higher than in the previous year. The winter loss rates varied greatly between countries, from 7.4% to 36.5%. 3216 beekeepers from New Zealand managing 297,345 colonies reported 10.5% losses for their 2019 winter (six months earlier than for other, Northern Hemisphere, countries). We modelled the risk of loss as a dead/empty colony or from unresolvable queen problems, for all countries except New Zealand. Overall, larger beekeeping operations with more than 50 colonies experienced significantly lower losses (p < 0.001). Migration was also highly significant (p < 0.001), with lower loss rates for operations migrating their colonies in the previous season. A higher proportion of new queens reduced the risk of colony winter loss (p < 0.001), suggesting that more queen replacement is better. All three factors, operation size, migration and proportion of young queens, were also included in a multivariable main effects quasi-binomial GLM and all three remained highly significant (p < 0.001). Detailed results for each country and overall are given in a table, and a map shows relative risks of winter loss at the regional level.
- Published
- 2023
3. Honey bee colony loss rates in 37 countries using the COLOSS survey for winter 2019–2020: the combined effects of operation size, migration and queen replacement
- Author
-
Gray, Alison, primary, Adjlane, Noureddine, additional, Arab, Alireza, additional, Ballis, Alexis, additional, Brusbardis, Valters, additional, Bugeja Douglas, Adrian, additional, Cadahía, Luis, additional, Charrière, Jean-Daniel, additional, Chlebo, Robert, additional, Coffey, Mary F., additional, Cornelissen, Bram, additional, Costa, Cristina Amaro da, additional, Danneels, Ellen, additional, Danihlík, Jiří, additional, Dobrescu, Constantin, additional, Evans, Garth, additional, Fedoriak, Mariia, additional, Forsythe, Ivan, additional, Gregorc, Aleš, additional, Ilieva Arakelyan, Iliyana, additional, Johannesen, Jes, additional, Kauko, Lassi, additional, Kristiansen, Preben, additional, Martikkala, Maritta, additional, Martín-Hernández, Raquel, additional, Mazur, Ewa, additional, Medina-Flores, Carlos Aurelio, additional, Mutinelli, Franco, additional, Omar, Eslam M., additional, Patalano, Solenn, additional, Raudmets, Aivar, additional, San Martin, Gilles, additional, Soroker, Victoria, additional, Stahlmann-Brown, Philip, additional, Stevanovic, Jevrosima, additional, Uzunov, Aleksandar, additional, Vejsnaes, Flemming, additional, Williams, Anthony, additional, and Brodschneider, Robert, additional
- Published
- 2022
- Full Text
- View/download PDF
4. Spatial clusters of Varroa destructor control strategies in Europe
- Author
-
Brodschneider, Robert, Schlagbauer, Johannes, Arakelyan, Iliyana, Ballis, Alexis, Brus, Jan, Brusbardis, Valters, Cadahía, Luis, Charrière, Jean-Daniel, Chlebo, Robert, Coffey, Mary F., Cornelissen, Bram, da Costa, Cristina Amaro, Danneels, Ellen, Danihlík, Jiří, Dobrescu, Constantin, Evans, Garth, Fedoriak, Mariia, Forsythe, Ivan, Gregorc, Aleš, Johannesen, Jes, Kauko, Lassi, Kristiansen, Preben, Martikkala, Maritta, Martín-Hernández, Raquel, Mazur, Ewa, Mutinelli, Franco, Patalano, Solenn, Raudmets, Aivar, Simon Delso, Noa, Stevanović, Jevrosima, Uzunov, Aleksandar, Vejsnæs, Flemming, Williams, Anthony, Gray, Alison, Brodschneider, Robert, Schlagbauer, Johannes, Arakelyan, Iliyana, Ballis, Alexis, Brus, Jan, Brusbardis, Valters, Cadahía, Luis, Charrière, Jean-Daniel, Chlebo, Robert, Coffey, Mary F., Cornelissen, Bram, da Costa, Cristina Amaro, Danneels, Ellen, Danihlík, Jiří, Dobrescu, Constantin, Evans, Garth, Fedoriak, Mariia, Forsythe, Ivan, Gregorc, Aleš, Johannesen, Jes, Kauko, Lassi, Kristiansen, Preben, Martikkala, Maritta, Martín-Hernández, Raquel, Mazur, Ewa, Mutinelli, Franco, Patalano, Solenn, Raudmets, Aivar, Simon Delso, Noa, Stevanović, Jevrosima, Uzunov, Aleksandar, Vejsnæs, Flemming, Williams, Anthony, and Gray, Alison
- Abstract
Beekeepers have various options to control the parasitic mite Varroa destructor in honey bee colonies, but no empirical data are available on the methods they apply in practice. We surveyed 28,409 beekeepers maintaining 507,641 colonies in 30 European countries concerning Varroa control methods. The set of 19 different Varroa diagnosis and control measures was taken from the annual COLOSS questionnaire on honey bee colony losses. The most frequent activities were monitoring of Varroa infestations, drone brood removal, various oxalic acid applications and formic acid applications. Correspondence analysis and hierarchical clustering on principal components showed that six Varroa control options (not necessarily the most used ones) significantly contribute to defining three distinctive clusters of countries in terms of Varroa control in Europe. Cluster I (eight Western European countries) is characterized by use of amitraz strips. Cluster II comprises 15 countries from Scandinavia, the Baltics, and Central-Southern Europe. This cluster is characterized by long-term formic acid treatments. Cluster III is characterized by dominant usage of amitraz fumigation and formed by seven Eastern European countries. The median number of different treatments applied per beekeeper was lowest in cluster III. Based on estimation of colony numbers in included countries, we extrapolated the proportions of colonies treated with different methods in Europe. This suggests that circa 62% of colonies in Europe are treated with amitraz, followed by oxalic acid for the next largest percentage of colonies. We discuss possible factors determining the choice of Varroa control measures in the different clusters.
- Published
- 2022
5. Supplementary information for the article: Brodschneider, R.; Schlagbauer, J.; Arakelyan, I.; Ballis, A.; Brus, J.; Brusbardis, V.; Cadahía, L.; Charrière, J.-D.; Chlebo, R.; Coffey, M. F.; Cornelissen, B.; da Costa, C. A.; Danneels, E.; Danihlík, J.; Dobrescu, C.; Evans, G.; Fedoriak, M.; Forsythe, I.; Gregorc, A.; Johannesen, J.; Kauko, L.; Kristiansen, P.; Martikkala, M.; Martín-Hernández, R.; Mazur, E.; Mutinelli, F.; Patalano, S.; Raudmets, A.; Simon Delso, N.; Stevanovic, J.; Uzunov, A.; Vejsnæs, F.; Williams, A.; Gray, A. Spatial Clusters of Varroa Destructor Control Strategies in Europe. J Pest Sci 2022. https://doi.org/10.1007/s10340-022-01523-2.
- Author
-
Brodschneider, Robert, Schlagbauer, Johannes, Arakelyan, Iliyana, Ballis, Alexis, Brus, Jan, Brusbardis, Valters, Cadahía, Luis, Charrière, Jean-Daniel, Chlebo, Robert, Coffey, Mary F., Cornelissen, Bram, da Costa, Cristina Amaro, Danneels, Ellen, Danihlík, Jiří, Dobrescu, Constantin, Evans, Garth, Fedoriak, Mariia, Forsythe, Ivan, Gregorc, Aleš, Johannesen, Jes, Kauko, Lassi, Kristiansen, Preben, Martikkala, Maritta, Martín-Hernández, Raquel, Mazur, Ewa, Mutinelli, Franco, Patalano, Solenn, Raudmets, Aivar, Simon Delso, Noa, Stevanović, Jevrosima, Uzunov, Aleksandar, Vejsnæs, Flemming, Williams, Anthony, Gray, Alison, Brodschneider, Robert, Schlagbauer, Johannes, Arakelyan, Iliyana, Ballis, Alexis, Brus, Jan, Brusbardis, Valters, Cadahía, Luis, Charrière, Jean-Daniel, Chlebo, Robert, Coffey, Mary F., Cornelissen, Bram, da Costa, Cristina Amaro, Danneels, Ellen, Danihlík, Jiří, Dobrescu, Constantin, Evans, Garth, Fedoriak, Mariia, Forsythe, Ivan, Gregorc, Aleš, Johannesen, Jes, Kauko, Lassi, Kristiansen, Preben, Martikkala, Maritta, Martín-Hernández, Raquel, Mazur, Ewa, Mutinelli, Franco, Patalano, Solenn, Raudmets, Aivar, Simon Delso, Noa, Stevanović, Jevrosima, Uzunov, Aleksandar, Vejsnæs, Flemming, Williams, Anthony, and Gray, Alison
- Abstract
Table S1. Utilized packages of the statistical software R version 4.0.4.
- Published
- 2022
6. Spatial clusters of Varroa destructor control strategies in Europe
- Author
-
Brodschneider, Robert, primary, Schlagbauer, Johannes, additional, Arakelyan, Iliyana, additional, Ballis, Alexis, additional, Brus, Jan, additional, Brusbardis, Valters, additional, Cadahía, Luis, additional, Charrière, Jean-Daniel, additional, Chlebo, Robert, additional, Coffey, Mary F., additional, Cornelissen, Bram, additional, da Costa, Cristina Amaro, additional, Danneels, Ellen, additional, Danihlík, Jiří, additional, Dobrescu, Constantin, additional, Evans, Garth, additional, Fedoriak, Mariia, additional, Forsythe, Ivan, additional, Gregorc, Aleš, additional, Johannesen, Jes, additional, Kauko, Lassi, additional, Kristiansen, Preben, additional, Martikkala, Maritta, additional, Martín-Hernández, Raquel, additional, Mazur, Ewa, additional, Mutinelli, Franco, additional, Patalano, Solenn, additional, Raudmets, Aivar, additional, Simon Delso, Noa, additional, Stevanovic, Jevrosima, additional, Uzunov, Aleksandar, additional, Vejsnæs, Flemming, additional, Williams, Anthony, additional, and Gray, Alison, additional
- Published
- 2022
- Full Text
- View/download PDF
7. PRACTICE OF GREEN COVER CROPS, WITH BENEFITS FOR INCREASING SOIL PROPERTIES AND THE VALUE OF BEE PRODUCTION
- Author
-
Drăgan Mirela, Dănăilă-Guidea, Silvana, Adrian-Gheorghe BĂȘA, Jurcoane, Stefana, Dobrescu Constantin, and Dumitru, Zaharia
- Published
- 2022
- Full Text
- View/download PDF
8. PRACTICE OF GREEN COVER CROPS, WITH BENEFITS FOR INCREEASE OF SOIL PROPERTIES AND THE VALUE OF BEE PRODUCTION.
- Author
-
DRĂGAN, Mirela, DĂNĂILĂ-GUIDEA, Silvana Mihaela, BĂŞA, Adrian Gheorghe, JURCOANE, Ştefana, and DOBRESCU, Constantin
- Subjects
COVER crops ,CROPPING systems ,SOIL fertility ,MONOCULTURE agriculture ,BEES - Abstract
Numerous studies have demonstrated the importance of proper cover crop management for optimized benefits to soil physical, chemical and biological properties. Cover crops can increase soil carbon and nitrogen as well as other nutrients and improve their cycling within cropping systems. Cover crops have the potential to provide many benefits to soil health in various cropping systems and climates and to obtain various organic agricultural products demanded in the market at low cost. The potential of cover crops to maintain and build soil fertility can allow a reduced dependence on synthetic fertilizer inputs. The research undertaken aims to identify, study and put into practice alternative sources of food (nectar and pollen) for bees and other pollinating insects by introducing new crops into the agricultural circuit, which meet the agro-environmental conditions, in the situation of limiting food sources for these, due to the expansion of monocultures and crops with diminished honeydew qualities and with a shorter flowering period. [ABSTRACT FROM AUTHOR]
- Published
- 2022
9. A CAP FOR POLLINATORS How the new CAP may support pollinators and pollinators benefit the new CAP
- Author
-
Simon-Delso, Noa, Adolphe, Cindy, Salazar, Andrés, Étienne Bruneau, Panella, Francesco, Dobrescu, Constantin, Rubinigg, Michael, and Boigenzahn, Christian
- Published
- 2019
- Full Text
- View/download PDF
10. Diseño y desarrollo de plantillas sensorizadas de bajo coste para análisis de la marcha
- Author
-
Dobrescu, Constantin Cosmin
- Subjects
Informática ,Aplicación informática - Abstract
En este trabajo se pretende diseñar, desarrollar y evaluar un prototipo de vestible en forma de plantillas con 3 tipos de sensores integrados: de presión, acelerómetro triaxial y giróscopo triaxial. Los datos procedentes de los sensores serán preprocesados en el sistema embebido en cada plantilla y enviados a una aplicación móvil empleando Bluetooth Low Energy. Dichos datos serán recibidos en el smartphone manteniendo una frecuencia de adquisición estable de 50 Hertzios. Una vez allí, un procedimiento de interpolación de los valores de presión permitirá modelar en tres dimensiones y en tiempo real patrones de presión plantar. Además, la información de orientación de cada plantilla será renderizada en la pantalla del móvil, como resultado de la aplicación previa de un algoritmo de fusión sensorial en el dispositivo embebido. El diseño y desarrollo de las plantillas sensorizadas implica múltiples disciplinas digitales, desde el modelado 3D paramétrico, la fabricación aditiva y la implementación del rmware del sistema embebido, hasta el diseño y síntesis de placas de circuito impreso y su ensamblado. Se han desarrollado múltiples algoritmos en diferentes plataformas (tanto embebidas como móviles), empleando lenguajes de programación distintos pasando por C, Java o JavaScript. Especí camente, el código JavaScript se ha utilizado para la visualización de los patrones de presión plantar, utilizando el motor grá co “THREE JS”, que a su vez se ha incrustado en el código Java del ecosistema Android. El prototipo desarrollado hace posible la adquisición de datos de presión plantar, útiles para el análisis cuantitativo de la marcha, por medio de una interfaz implícita y transparente para el usuario nal. En este sentido, el prototipo nal cuenta con unas dimensiones similares a las de la mayoría de plantillas comerciales ofreciendo el menor intrusismo posible. Siguiendo la misma línea de facilitar el uso, se ha implementado un módulo de carga inalámbrica de las plantilla empleando el estándar Qi. En el transcurso del trabajo, se presta especial atención al consumo eléctrico del dispositivo vestible, consiguiendo optimizarlo de modo que el consumo de cada plantilla del prototipo nal está por debajo del de un simple diodo LED. Para realizar estos análisis se han necesitados equipos de laboratorio y herramientas auxiliares tales como un osciloscopio, multímetro, fuente de alimentación regulable, soldador eléctrico y microscopio digital para el soldado de circuitos integrados, entre otros., In this work, a wearable prototype consisting of a pair of wireless insoles is designed, developed and evaluated. The insoles integrates 3 di erent types of sensors: pressure, triaxial accelerometer and triaxial gyroscope. The data acquired by the sensors is preprocessed in an embedded system in each insole and then sent to a mobile application using Bluetooth Low Energy. This data is received on the smartphone with a stable acquisition frequency of 50 Hertz. Once there, a real-time interpolation process is performed to model plantar pressure patterns in 3D. In addition, the orientation information of each insole is rendered on the mobile screen, as a result of the previous application of a sensor fusion algorithm in the embedded device. The design and development of the sensorized insole involves multiple digital disciplines, from parametric 3D modeling, additive manufacturing and the implementation of the embedded system rmware, to the design and synthesis of printed circuit boards and their assembly. Multiple algorithms have been developed in di erent platforms (both embedded and mobile), using di erent programming languages such as C, Java or JavaScript. Speci cally, the JavaScript code has been used for plantar pressure pattern visualization, through the “ THREE JS ” graphic engine, which in turn, has been embedded in the Java code of the Android’s ecosystem. The developed prototype makes it possible to acquire plantar pressure data, which is useful for quantitative gait analysis, through an implicit and transparent interface for the end user. In this sense, the nal prototype has dimensions similar to those in most commercial insoles, o ering the least possible intrusiveness. Following the same line of promoting the use, a wireless charging module has been implemented in each insole using the Qi standard. In the course of the work, special attention is paid to the electrical consumption of the wearable device, getting it optimized so that the consumption of each insole is below the consumption of a single LED. In order to carry out these analyses, laboratory equipment and auxiliary tools have been needed, such as an oscilloscope, multimeter, adjustable power supply, electric soldering iron and digital microscope for integrated circuit welding, among others
- Published
- 2018
11. „PĂROŞII ORIENTULUI” LA BUCUREŞTI.
- Author
-
DOBRESCU, CONSTANTIN
- Published
- 2018
12. NEW ASPECTS REGARDING GROOMING ANTIVARROA BEHAVIOUR OF APIS MELLIFERA CARPATICA.
- Author
-
CHIOVEANU, GABRIELA, DOBRESCU, CONSTANTIN, and DOBRE, GHEORGHE
- Subjects
GROOMING behavior in animals ,CAPE honeybee ,VARROA destructor ,APIARIES ,BROOD parasites - Abstract
Grooming behaviour of the race Apis meHifera carpatica in relation to Varroa destructor was studied in an experimental apiary. There are two behaviors of the honey bee related to Varroa mite: hygienic behavior and grooming behavior. Studies have shown that Apis meHifera carpatica colonies remove worker brood infested with Varroa destructor mites from the nest (hygienic behavior), and groom the mites off themselves and from other adult bees (grooming behavior). Preliminary research revealed the connection between the treatments against Varroa with an organic product based on oxalic acid and an increased level of grooming behaviour of the honey bee under these circumstances. Three different types of parasitic mite chitin lesions have been observed by laboratory exams. This paper presents these three types of Varroa mite lesions and their natural causes. [ABSTRACT FROM AUTHOR]
- Published
- 2011
13. AU UCIS GERMANII PRIZONIERI CU GAZE TOXICE LA PLOIEŞTI?
- Author
-
DOBRESCU, CONSTANTIN
- Abstract
Copyright of Magazin Istoric is the property of Fundatia Culturala Magazin Istoric and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.