Temat: threshold control - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ekologiczne podstawy ustalania progów szkodliwości chwastów roślin uprawnych
Ekologicheskie osnovy opredelenija porogov vrednosti sornjakov kulturnykh rastenij
Ecological foundations of the establishment of weed harmfulness thresholds for crops
Autorzy:: Rola, H.
Powiązania:: https://bibliotekanauki.pl/articles/797457.pdf
Data publikacji:: 1988
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: rosliny uprawne
ochrona roslin
patogeny roslin
szkodliwosc
zwalczanie chwastow
zachwaszczenie lanu
chemical weed control
weed control
plant protection
establishment
weed
harmfulness
threshold
crop
Opis:: В современной защите растений критерием химической борьбы с сорняками должны быть пороги биологической и экономической вредности определенных видов и целого сообществ. В статье, на основании доказательного материала полученного и микроделяночных и полевых овытах установлена изменчивость этих величин по отношению к таким факторам, как: вид сорняка и его соперническая сила, пространственное распределение растений в поле, сорт, соперническая способность и уровень урожаев культурного растения, а также почвенные условия среды.
A criterion of chemical weed control should be in contemporary plant protection thresholds of biological and economic harmfulness of definite weed species and their whole communities. Variability of the above values in relation to such factors, as weed species and its competitive power, spatial arrangement of plants in the stand, variety, competitive ability and yielding level of the given crop as well as soil conditions of the given site has been proved in the paper basing on the evidence from microplot and field experiments.
Źródło:: Zeszyty Problemowe Postępów Nauk Rolniczych; 1988, 349
0084-5477
Pojawia się w:: Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The system M2θ/G/1/m with threshold control of the arrival rate and service time
Autorzy:: Zhernovyi, Y.
Kopytko, B.
Powiązania:: https://bibliotekanauki.pl/articles/122409.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: queueing system
flows of two types of customers
batch arrival of customers
threshold control
busy period
distribution of the number of customers
system obsługi
Opis:: We consider a M2θ/G/1/m queueing system with arrival of customer batches, which uses a threshold control mechanism of the service time and arrival rate. The system receives two independent flows of customers, one of which is blocked in an overload mode (under the condition that the number of customers in the system exceeds a given threshold value h). Full blocking of the input flow is carried out from the moment when the queue length reaches the number m until the beginning of the service of the first customer, for which the number of customers in the system does not exceed h. From the beginning of the service of the first customer during the excess of number of customers in the system of h until the completion of full blocking the time of service of customer is distributed under the law of F(x) (an increased service rate is used). Rest of the time the system applies the normal service rate with the distribution function F(x) of service time. Laplace transforms for the distributions of the number of customers in the system during the busy period and for the distribution function of the busy period are found. The average duration of the busy period is obtained. Formulas for the stationary distribution of the number of customers in the system, for the probability of service and for the stationary characteristics of the system are established. The obtained results are verified with the help of a simulation model constructed with the assistance of GPSS World tools.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 2; 149-163
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Elaboration of a strategy to control the peach twig borer Anarsia lineatella Zeller in the Sefrou region in Morocco
Autorzy:: Asfers, A.
Blenzar, A.
Rachdaoui, M.
Joutei, A.B.
Houssa, A.A.
Sekkat, A.
Powiązania:: https://bibliotekanauki.pl/articles/66784.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: control strategy
peach twig borer
Anarsia lineatella
tolerance threshold
Sefrou region
Morocco
Opis:: Trapping by specific sex pheromones initiated in 2009 to monitor three pests, peach twig borer (Anarsia lineatella), oriental fruit moth (Cydia molesta) and plum fruit moth (Grapholita funebrana) revealed the greater importance of peach twig borer in comparison to the others. The results of monitoring the development of larval stages over time and the accumulated degree-days from biofix show that the pest develops five generations per year, one of which undergoes a diapause. In 2009 and 2010 chemical control based on tolerance threshold of 10 males/trap/2 weeks showed unsatisfactory results. With this method, the percentage of affected fruits increased from 6.8% in 2009 to 18.6% in 2010 despite the application of four treatments of organophosphate-based insecticides in 2009 and the application of four treatments in 2010 using active ingredients from different chemical families (pyrethroid, organophosphate and chlorinicotinyl). On the other hand, management of the peach twig borer by the degree-days method tested and planned on the basis of a bifenthrin treatment between 150 to 204 degree-days accumulated from biofix, gave interesting results where the percentage of affected fruits hardly exceeded 0.5% over the four years of study
Źródło:: Journal of Plant Protection Research; 2016, 56, 4
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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