to assess hard ticks population on sangsari sheep breed under the effect of weather’s parameters such as duration of sun shine, humidity, ambient temperature, altitude, 5% of a flock (almost 1000 sheep in mountains and fields of semnan and tehran provinces) were randomly separated and were observed monthly. during a year, a total of 1505 hard ticks (635 females and 870 males) containing dermace...

[1] We use a simple trajectory model to investigate the mechanisms that regulate midand upper-tropospheric humidity. Our model advects water passively and contains no microphysics other than the requirement that water vapor is immediately removed so as to prevent the relative humidity from ever exceeding 100%. We demonstrate that our model accurately reproduces H2O measurements made by the Atmo...

The comparison of simultaneous humidity measurements by the Vaisala RS92 radiosonde and by the Cryogenic Frostpoint Hygrometer (CFH) launched at Alajuela, Costa Rica, during July 2005 reveals a large solar radiation dry bias of the Vaisala RS92 humidity sensor and a minor temperature-dependent calibration error. For soundings launched at solar zenith angles between 10° and 30°, the average dry ...

Cough is a troublesome condition which affects many visitors to high altitude. Traditionally it has been attributed to the inspiration of the cold, dry air which characterizes the high altitude environment. This aetiology was brought into question by observations and experiments in long duration hypobaric chamber studies in which cough still occurred despite controlled temperature and humidity....

The aim of this study was to determine the frequency of cough and the citric acid cough threshold during hypobaric hypoxia under controlled environmental conditions. Subjects were studied during Operation Everest 3. Eight subjects ascended to a simulated altitude of 8,848 m over 31 days in a hypobaric chamber. Frequency of nocturnal cough was measured using voice-activated tape recorders, and c...

FlOg LeI' tl J. TIzI.nl, FEllOW SPIE lJIiVtl>ilY of Stuttgart trotiMe of Applied Optics PIa~_aIdring 9 ~~9Sruttgart,Genmany Abstract. The image quality of airborne photographs is influenced by the atmosphere. Several factors affect the atmosphere, such as temperature, pressure. humidity, and wind speed. Furthermore, these atmospheric influences Bre dependent on the flight altitude. The MTF of t...

This paper describes the design and implementation of a radiosonde which can measure the meteorological temperature, humidity, pressure, and other atmospheric data. The system is composed of a CPU, microwave module, temperature sensor, pressure sensor and humidity sensor array. In order to effectively solve the humidity sensor condensation problem due to the low temperatures in the high altitud...

Previously reported work in Uganda Protectorate included a leprosy survey by samples of the population in a wide range of places (1). The total number of persons examined then was 14,808, and the leprosy prevalence indicated was 54 per thousand; but since the population of Uganda is over 4,000,000 it was emphasized at the time that that survey needed amplifying and extending. In pursuance of th...

Optically thin cirrus near the tropical tropopause regulate the humidity of air entering the stratosphere, which in turn has a strong influence on the Earth's radiation budget and climate. Recent high-altitude, unmanned aircraft measurements provide evidence for two distinct classes of cirrus formed in the tropical tropopause region: (i) vertically extensive cirrus with low ice number concentra...

This study tested the potential influence of meteorological parameters (temperature, humidity, wind direction, thermal convection) on different migration characteristics (namely flight speed, altitude and direction and daily distance) in 16 black storks (Ciconia nigra). The birds were tracked by satellite during their entire autumnal and spring migration, from 1998 to 2006. Our data reveal that...