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Search Results: 1 - 10 of 135 matches for " Genoveva Perju "
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Seismic Risk Identification Based on the Expected Annualized Losses
Genoveva Perju,Gabriela-Maria Atanasiu
Bulletin of the Polytechnic Institute of Jassy, Constructions, Architechture Section , 2006,
Abstract: A new method for the seismic risk identification is proposed based on the average measure of the expected annualized losses from earthquake occurrence. We show up how can be identified the risk for insurance decisional purposes. The analysis is useful for insured as well as for insurance company. When risk is considered from time dynamical perspective we emphasize the advantage of diversification for earthquake risk mitigation.
Aerul ?i Apa : Componente ale Mediului , 2012,
Abstract: CHARACTERISTICS OF THE AVERAGE LIQUID FLOW IN THE VALEA CERBULUI RIVER BASIN. This article aims to emphasize the characteristics of the average liquid flow in the Valea Cerbului Basin (a tributary of the upper course of Prahova River). Although it is a small hydrographic basin (26 km2), it has distinct hydrological features, which are imposed by the morphological, morphometrical and climatic conditions of this area. In order to achieve this purpose, the hydrological data series (recorded on Valea Cerbului) on the average flow have been statistically analyzed. Analyses revealed as main hydrological features of this basin: a relatively reduced interannual variability of the average flow (Cv = 0.33); a hydrologic regime with high flow in July and reduced flow in January and February; a significant share of the annual flow (52%) from April to July and a reduced one during the winter (13% of the annual flow). According to Mann-Kendall test, at both monthly and seasonal level, average discharge shows (generally) ascending trends, but particularly significant are the trends between August and December and the trend calculated for the season autumn.
Clover species, hosts for different flowers and seeds eating curculionidae
Teodosie PERJU
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1970,
Abstract: Au cours des annés 1956-1968 on a noté la composition des éspéces de Curculionidae qui se developpent sur des differantes éspéces sauvages de trefle. Des echantillons d'inflorescences, fragments de tiges et feuilles ont été elevées en captivité 15 éspéces de Curculionidae (tab. 1). De l'inflorescences des differentes éspéces de Trifolium ont apparu des insectes appartenant aux genres Apion et Miccotrogus (tab. nr. 3.1). De fragmentes des tiges de T. hybridum, T. campestre et T. pratense ont apparu des charancons apartenant a l'éspéces A. seniculus et de ceux de T. monotanum des exemplaires de A. filirostre. Le feuillage de la majorité des éspéces de trefle a servi comme nourriture aux larves et aux insectes du Hypera meles et H. nigrirostris, aussi que, aux insectes de Sitona sulcifrons, S. humeralis et S.suturalis. Le trefle rouge sauvage infesté dans un degré juscu' à 26% constitue le reserve et la source permanente d' infestation pour les cultures de trefle rouge en ce qui concernele principales éspéces de charancons Apion trifolii et A. apricans, et le tréfle blanc et hybride sauvages infestés dans un degré jusqu' à 46% et respectivement 44%, constituent une important source d'infestation avec des charancons A. dichroum et A. nigritarse. Le tréfle hybride est endommagé relativement fortement aussi par le charancons des tiges A. seniculus. Les autres éspéces florifages et semnivores, A. varipes, A, assimile Miccotrogus picirostriset les éspéces, folifages d' Hypera et Sitona apparaissant dans un nombre reduit d'exemplaires, s'ont été comportés comme ravageurs d'importance secondaires.
Lucr?ri ?tiin?ifice : Management Agricol , 2009,
Abstract: The necessity in paper elaboration is to know in detail the supply and the consumption needs of this main product which are potato, being very kneed that this crop represent one of the main products in feeding the people in the north of the country. The Suceava County are one of the main potato producers from Romania, the output acquired being enough to satisfy local demand and the surplus succeed to cover in large measure the needs of this products on national level.Analysing the statistic data result that the main suppliers are: Mili u i-25.019 tons, Moara-20.326 tons, Cornu Luncii-14.585 tons, Todire ti-14.286 tons, Bosanci-13.030 tons, Calafinde ti-12.490 tons, Ca vana-11.946 tons. The important potato outputs are acquired also in others commune of the county, nearly 10.000 tons ( Gr nice ti , D rm ne ti , Fantanele , G l ne ti ).
Seminifagous insects growing on inflorescences of Centaurea species (Asteraceae)
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1989,
Abstract: A study was performed on the entomofauna growing on inflorescences of 14 Centaurea species, the most common found in the Romanian flora. Eleven species of Thephritidae-diptera were evidenced their larvae feeding on Centaurea flowers and seeds. Some species of Thephritidae-diptera as: Chaetorelia jacea, Urophora jaceana, U. quadrifasciata, strongly infesting various Centaurea species, problem weeds of some natural or cultivated ecosystems, become phytophagous and have a most significant share in the biological control of those weeds.
Host-plants for seminiphagous insects IV (Brassicaceae, Campanulaceae, Caryophyllaceae, Euphorbiaceae, Geraniaceae, Resedaceae and Scrophulariaceae)
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1987,
Abstract: During the period 1970-1984 inflorescences with fruits and seeds have been collected, from 14 host-plants of several botanical families and the species of insects feeding on their flowers, fruits and seeds have been identified. The species of seminiphagous have been for the first time obtained in our country by the method of pure cultures in laboratory conditions. The following species of seminiphagous have been identified in the fruits and seeds of these cultivated or spontaneous species of host-plants: Gymnetron campanullae L., Sibinia pellucens Scop., Ceuthorrynchus assimilis Payk., Gymnetron anthyrrhinii Payk., G. netum L., Systole euphorbiae Zer. Among the identified seminiphagous species, Gymnetron campanullae L., Systole euphorbiae Zer. (Eurytomidae) are new in the fauna of our country.
Entomofauna of Centaurea sp. and their economic importance
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1990,
Abstract: The different species of Centaurea are host of numerous insects: among the most important some are pollinating (Apis melifica L.), the most of them are phytophagous (Larinus obtusus...,Agonopterix liturella Den. et Schiff., Chaetorellia jaceae R. D., Crophora quadrifasciata Meig.) and others are zoophagous (Exeristes roborator F. and Zeuxia cinerea Meig.). The plant root is harmed by the larvae of Pelochrista medulana Stgr., the stalk is mined by the caterpillars of Agonopterix liturella Den. et Schiff., and the flowers and seeds are destroyed by the larvae of Larinus obtusus Gyll., Eucosoma hohenwartina Den. et Schiff., E. aemulana Schlang., Chaetorellia jaceae R.D. and Urophora quadrifasciata Meig. Due to the population density and to the caused damages, the species Agonopterix liturella Den. et Schiff., Larinus obtusus Gyll., Chaetorellia jaceae R.D. and Urophora quadrifasciata Meig., are these who present a practical importance as agents of biological control of the knapweed species, especially Centaurea phrygia. On the whole, considering the seed losses caused only by the seed weevil (Larinus obtusus Gyll.) and by tephritids flies of the knapweed seeds (Chaetorellia sp. and Urophora sp.) these are estimated to 50-60 %.
Host plants for seminiferous insects (III). The Umbeliferae family (Apiaceae)
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1985,
Abstract: Comprising data registered in the interval 1976-1983, the report introduces 9 species of seminiferous insects on 21 host plants of the Umbeliferae family. From the seeds of these plants , 5 lepidoptera and 4 hymenoptera species were obtained. The species S. tuonella and S. conspicua were not recorded before in the indigenous literature.
Investigations on biological control of weeds in Romania
Teodosie PERJU,Alexandru SALONTAI
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1989,
Abstract: Conducted and systematic investigations on the biological control of weeds were not carried out both in this country and within the Agronomy Institute of Cluj-Napoca, namely by the Departament of Entomology (T. Perju 3-6). In 1985-1987, as a result of investigations led by the authors, there were traced down the troublesome weeds in the main agroecosystems as well as the carriers and phytophagous insects contributing spontaneously to the reduction of weed thickness in the crops and to reducing their spreading ability.
Leguminous host-plants for seminiphagous insects (I)
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1981,
Abstract: During the period from 1955 till 1980, thirty-eight seminiphagous insects were isolated from seeds of forty-two plant species pertaining to the Leguminosae family. Twenty-five species were Coleoptera (10 Bruchidae, 15 Curculionidae), six were Lepidoptera (Eupiatidae, Tortricidae and Phycitidae) and seven were Hymenoptera (Eurytomidae). Most of the presented species have been well known in the Romanian faunistic literature, and for a wide range of them comments were made on their economic significance. Seminiphagous insects found in some leguminous species sparse or rare in Transilvanian flora may represent a limiting factor for the spreading of the host plants concerned.
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