Weather Factors Influencing Catch of Neodiprion sertifer (Hymenoptera: Diprionidae) in Pheromone Traps

1993 ◽  
Vol 22 (2) ◽  
pp. 445-452 ◽  
Author(s):  
Peter Jönsson ◽  
Olle Anderbrant
Keyword(s):  
Neodiprion Sertifer ◽  
Pheromone Traps ◽  
Weather Factors ◽  
Factors Influencing

scholarly journals Weather Factors Influencing the Population Dynamics ofCulex pipiens(Diptera: Culicidae) in the Po Plain Valley, Italy (1997-2011)

2014 ◽  
Vol 43 (2) ◽  
pp. 482-490 ◽  
Author(s):  
Marco Carrieri ◽  
Piero Fariselli ◽  
Bettina Maccagnani ◽  
Paola Angelini ◽  
Mattia Calzolari ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Weather Factors ◽  
Po Plain ◽  
Factors Influencing

scholarly journals An optimal control model of the spread of the COVID-19 pandemic in iraq: Deterministic and chance-constrained model

2020 ◽  
pp. 1-15
Author(s):  
Ali Khaleel Dhaiban ◽  
Baydaa Khalaf Jabbar
Keyword(s):  
Optimal Control ◽  
Control Variable ◽  
Weather Conditions ◽  
Control Model ◽  
Weather Factors ◽  
True Nature ◽  
Factors Influencing ◽  
Inverse Effect ◽  
Constrained Model ◽  
The Pontryagin Maximum Principle

Many studies have attempted to understand the true nature of COVID-19 and the factors influencing the spread of the virus. This paper investigates the possible effect the COVID-19 pandemic spreading in Iraq considering certain factors, that include isolation and weather. A mathematical model of cases representing inpatients, recovery, and mortality was used in formulating the control variable in this study to describe the spread of COVID-19 through changing weather conditions between 17th March and 15th May, 2020. Two models having deterministic and an uncertain number of daily cases were used in which the solution for the model using the Pontryagin maximum principle (PMP) was derived. Additionally, an optimal control model for isolation and each factor of the weather factors was also achieved. The results simulated the reality of such an event in that the cases increased by 118%, with an increase in the number of people staying outside of their house by 25%. Further, the wind speed and temperature had an inverse effect on the spread of COVID-19 by 1.28% and 0.23%, respectively. The possible effect of the weather factors with the uncertain number of cases was higher than the deterministic number of cases. Accordingly, the model developed in this study could be applied in other countries using the same factors or by introducing other factors.

scholarly journals Seasonal and weather factors influencing the annual flight cycle of Prostephanus truncatus (Coleoptera: Bostrichidae) and its predator Teretriosoma nigrescens (Coleoptera: Histeridae) in Benin

1997 ◽  
Vol 87 (3) ◽  
pp. 239-246 ◽  
Author(s):  
C. Borgemeister ◽  
W. G. Meikle ◽  
D. Scholz ◽  
C. Adda ◽  
P. Degbey ◽  
...  
Keyword(s):  
Host Plants ◽  
Regression Coefficient ◽  
Flight Activity ◽  
Prostephanus Truncatus ◽  
Weather Variables ◽  
Weather Factors ◽  
Factors Influencing ◽  
Accumulated Rainfall ◽  
Woody Host ◽  
Teretriosoma Nigrescens

AbstractInvestigations were carried out in southern Benin on the annual flight cycle and the effects of weather variables on the flight activity of Prostephanus truncatus (Horn) and its natural enemy, Teretriosoma nigrescens Lewis. Two seasonal peaks in flight activity of P. truncatus were observed, one between the end of December and the beginning of January and a second one between May and June. Teretriosoma nigrescens showed a single delayed peak in June, approximately six weeks after the major peak of P. truncatus. Flight activity of P. truncatus was only weakly associated with weather characteristics (standardized regression coefficient for mean daily temperature b = 0.18, t = 2.87, P < 0.05)), whereas for T. nigrescens it was associated with precipitation (standardized regression coefficient for accumulated rainfall during the trapping period b = 0.38, t = 4.76, P < 0.05). The possibility that one of the P. truncatus peaks was associated with dispersal from crowded maize stores and the other with the search for natural woody host plants is discussed.

SEX-SPECIFIC EMERGENCE OF IPS TYPOGRAPHUS L. (COLEOPTERA: SCOLYTIDAE) AND FLIGHT BEHAVIOR IN RESPONSE TO PHEROMONE SOURCES FOLLOWING HIBERNATION

1986 ◽  
Vol 118 (1) ◽  
pp. 59-67 ◽  
Author(s):  
Åke Lindelöw ◽  
Jan Weslien
Keyword(s):  
Sex Ratio ◽  
Pheromone Trap ◽  
Ips Typographus ◽  
Flight Behavior ◽  
Pheromone Traps ◽  
Factors Influencing ◽  
Emergence Patterns ◽  
Temporal And Spatial ◽  
Trap Catches ◽  
Dispersal Characteristics

AbstractEmergence patterns, sex ratios, and dispersal characteristics of Ips typographus L. (Coleoptera: Scolytidae) emerging from hibernation sites were studied under field conditions. A total of 8666 emerging beetles were caught in 14 tent-traps, covering brood tree stumps at 3 different hibernation sites. Samples of these beetles were sexed at frequent intervals. The proportion of females increased as emergence progressed and the overall proportion of females was 62%. A total of 3433 beetles emerging after hibernation were marked and released on 19 separate occasions. The recapture rates were 13 and 4% in nearby and distant pheromone traps, respectively. Recaptures were recorded at distances of up to 1800 m. Beetles were able to respond and fly to pheromone sources shortly after emergence without prior feeding or prolonged flight activity. Trapping and marking techniques, temporal and spatial emergence patterns, seasonal sex ratio changes, and factors influencing pheromone trap catches are discussed.

SOME FACTORS INFLUENCING PHEROMONE TRAP CATCHES OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE)

1978 ◽  
Vol 110 (1) ◽  
pp. 51-55 ◽  
Author(s):  
D. G. R. McLeod ◽  
A. N. Starratt
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Pheromone Trap ◽  
Pheromone Traps ◽  
Rapid Loss ◽  
Corn Borer ◽  
Corn Borers ◽  
Factors Influencing ◽  
Lepidoptera Pyralidae ◽  
Trap Catches

AbstractA study was made of the reason for the fairly rapid loss of attractancy of pheromone traps for the European corn borer, Ostrinia nubilalis (Hübner). This loss in attractancy appeared to be attributable mainly to formation of an inhibitory or repellent substance(s). Although traps with a suspended pheromone dispenser were significantly more attractive than traps with the dispenser placed in contact with the adhesive, they still became relatively unattractive to male corn borers within approximately 1 week.

Factors influencing adhesive bonding at the bone/implant interface

1992 ◽  
Vol 50 (2) ◽  
pp. 1114-1115
Author(s):  
Julie A. Martini ◽  
Robert H. Doremus
Keyword(s):  
Electron Microscopy ◽  
Adhesive Bonding ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Bone Implant ◽  
Factors Influencing ◽  
Lr White ◽  
Transmission Electron ◽  
New Zealand White Rabbits ◽  
Scanning Electron

Tracy and Doremus have demonstrated chemical bonding between bone and hydroxylapatite with transmission electron microscopy. Now researchers ponder how to improve upon this bond in turn improving the life expectancy and biocompatibility of implantable orthopedic devices.This report focuses on a study of the- chemical influences on the interfacial integrity and strength. Pure hydroxylapatite (HAP), magnesium doped HAP, strontium doped HAP, bioglass and medical grade titanium cylinders were implanted into the tibial cortices of New Zealand white rabbits. After 12 weeks, the implants were retrieved for a scanning electron microscopy study coupled with energy dispersive spectroscopy.Following sacrifice and careful retrieval, the samples were dehydrated through a graduated series starting with 50% ethanol and continuing through 60, 70, 80, 90, 95, and 100% ethanol over a period of two days. The samples were embedded in LR White. Again a graduated series was used with solutions of 50, 75 and 100% LR White diluted in ethanol.

Factors Influencing Electrophysiologic Responsivity in Normal Adults

1965 ◽  
Vol 8 (4) ◽  
pp. 323-347
Author(s):  
Robert Goldstein ◽  
Benjamin RosenblÜt
Keyword(s):  
Conditioned Stimulus ◽  
White Light ◽  
Pure Tone ◽  
Alpha Rhythm ◽  
White Women ◽  
White Men ◽  
Inverse Relation ◽  
Factors Influencing ◽  
Electrodermal Responses ◽  
Normal Adults

Electrodermal and electroencephalic responsivity to sound and to light was studied in 96 normal-hearing adults in three separate sessions. The subjects were subdivided into equal groups of white men, white women, colored men, and colored women. A 1 000 cps pure tone was the conditioned stimulus in two sessions and white light was used in a third session. Heat was the unconditioned stimulus in all sessions. Previously, an inverse relation had been found in white men between the prominence of alpha rhythm in the EEG and the ease with which electrodermal responses could be elicited. This relation did not hold true for white women. The main purpose of the present study was to answer the following questions: (1) are the previous findings on white subjects applicable to colored subjects? (2) are subjects who are most (or least) responsive electrophysiologically on one day equally responsive (or unresponsive) on another day? and (3) are subjects who are most (or least) responsive to sound equally responsive (or unresponsive) to light? In general, each question was answered affirmatively. Other factors influencing responsivity were also studied.

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