نتایج جستجو برای: temperatures

تعداد نتایج: 112005  

ژورنال: علوم آب و خاک 2005
علی اصغر طالبی, , سعید محرمی‌پور, , علی حسینی, , شهریار عسگری, , یعقوب فتحی‌پور, ,

The biological parameters of cabbage aphid, Brevicoryne brassicae (L.) was studied in the laboratory conditions under the three constant temperatures (20, 25 and 30 ºC), RH 60±5% and a photoperiod of 16:8 (L:D) using 40 first instar nymphs. Among nymphs, 40%, 55% and 10% of them completed their nymphal period in 20, 25 and 30 ºC, respectively and developed to adult stage. In 30 ºC, the most bio...

2002
J. A. Loughmiller M. F. Spire S. S. Dritz B. W. Fenwick S. Hogge

An acute Actinobacillus pleuropneumonia challenge was used to study changes in rectal and radiant surface temperatures over 18 h. From 3.5 to 15 h after challenge, rectal temperatures were elevated in challenged pigs compared to nonchallenged controls. From 6 through 18 h after challenge, infrared surface temperature was higher for challenged pigs versus control nonchallenged pigs. Correlation ...

2001
THOMAS M. SMITH RICHARD W. REYNOLDS

Because of changes in SST sampling methods in the 1940s and earlier, there are biases in the earlier period SSTs relative to the most recent 50 years. Published results from the Met Office have shown the need for historic bias correction and have developed several correction techniques. An independent bias-correction method is developed here from an analysis using nighttime marine air temperatu...

2004
N. G. Andronova M. E. Schlesinger M. E. Mann

[1] Reconstructions of Northern Hemisphere near-surface temperatures from climate ‘proxy’ data such as tree rings, ice cores, and corals, suggest that late 20th century Northern Hemisphere mean warmth is anomalous in the context of the past several centuries and likely at least the past two millennia. Though substantial uncertainties in the paleoclimate reconstructions exist, these findings add...

Abstract: In this study an appropriate computational approach was presented for estimating the boiling temperatures of 41 different types of olefins and their derivatives. Based on the guidelines of this approach, several structural indices related to the organic components were applied using graph theory. Meanwhile, in addition to evaluating the relation between the boiling temperatures of ole...

In order to determinate the cardinal temperatures and investigate the effect of temperature on seed germination and seedling growth of Securigera securidaca, a study was conducted in a completely randomized design with 8 temperature treatments (5, 10, 15, 20, 25, 30, 35 and 40oC) and four replications in research laboratory of faculty of agriculture at the Birjand University in 2013. A two-segm...

2009
Gerald A. Meehl Claudia Tebaldi Guy Walton David Easterling Larry McDaniel

[1] The current observed value of the ratio of daily record high maximum temperatures to record low minimum temperatures averaged across the U.S. is about two to one. This is because records that were declining uniformly earlier in the 20th century following a decay proportional to 1/n (n being the number of years since the beginning of record keeping) have been declining less slowly for record...

2001
Robert N. Harris David S. Chapman

We construct a mid-latitude (30–60 N) reduced temperature-depth profile from a global borehole temperature database compiled for climate reconstruction. This reduced temperature profile is interpreted in terms of past surface ground temperature change and indicates warming on the order of 1C over the past 100 to 200 years. The combination of an initial temperature (the primary free parameter) w...

Journal: :The American journal of physiology 1964
P LOMAX E MALVEAUX R E SMITH

LOMAX, PETER, E. MALVEAUX, AND R. E. SMITH. Brain temperatures in the rat during exposure to low environmental temperatures. Am. J. Physiol. 207(s) : 736-739. 1g64.-Exposure to cold is known to elicit a rise in metabolic rate in various tissues of homeothermic animals. The role of the hypothalamus in this response was investigated by exposing normal and coldacclimated rats to environmental temp...

Journal: :iranian journal of science and technology transactions of mechanical engineering 2015
a. hussain f. abolaban s. m. khubaib s. mubin i. ahmed

nuclear cross sections that determine core multiplication strongly depend on core temperature (e.g., the doppler, moderator density effects etc). on the other hand, since this heat is generated by the neutron flux in the reactor core, the temperature distribution in the core will depend heavily on its neutronic behavior. fuel centerline temperature could be the limiting constraint on reactor po...

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