New Lidar Reveals Seasonal Temperature Variations in a Mid-latitude Mesopause Region

1994 ◽  
Vol 5 (12) ◽  
pp. 23 ◽  
Author(s):  
C. Y. She
Keyword(s):  
Seasonal Temperature ◽  
Mesopause Region ◽  
Temperature Variations

Seasonal temperature variations and energy demand

2012 ◽  
Vol 116 (3-4) ◽  
pp. 805-825 ◽  
Author(s):  
Enrica De Cian ◽  
Elisa Lanzi ◽  
Roberto Roson
Keyword(s):  
Energy Demand ◽  
Seasonal Temperature ◽  
Temperature Variations

scholarly journals Solar Activity and Svalbard Temperatures

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Jan-Erik Solheim ◽  
Kjell Stordahl ◽  
Ole Humlum
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Winter Temperature ◽  
Positive Trend ◽  
Seasonal Temperature ◽  
Solar Cycles ◽  
Temperature Variations ◽  
Mean Temperature ◽  
Cent Level ◽  
Cycle 24

The long temperature series at Svalbard (Longyearbyen) show large variations and a positive trend since its start in 1912. During this period solar activity has increased, as indicated by shorter solar cycles. The temperature at Svalbard is negatively correlated with the length of the solar cycle. The strongest negative correlation is found with lags 10–12 years. The relations between the length of a solar cycle and the mean temperature in the following cycle are used to model Svalbard annual mean temperature and seasonal temperature variations. Residuals from the annual and winter models show no autocorrelations on the 5 per cent level, which indicates that no additional parameters are needed to explain the temperature variations with 95 per cent significance. These models show that 60 per cent of the annual and winter temperature variations are explained by solar activity. For the spring, summer, and fall temperatures autocorrelations in the residuals exist, and additional variables may contribute to the variations. These models can be applied as forecasting models. We predict an annual mean temperature decrease for Svalbard of °C from solar cycle 23 to solar cycle 24 (2009–20) and a decrease in the winter temperature of °C.

Adjusting oral oxybutynin medication for hyperhidrosis to reflect seasonal temperature variations

2018 ◽  
Vol 31 (4) ◽  
pp. e12615 ◽  
Author(s):  
Javier del Boz ◽  
José Francisco Millán-Cayetano ◽  
Pablo García-Montero ◽  
Cristina García-Harana ◽  
Francisco Rivas-Ruiz ◽  
...  
Keyword(s):  
Seasonal Temperature ◽  
Temperature Variations

scholarly journals The karren peeling off on marbles in Altai (Altai Republic, Russian Federation)

2020 ◽  
Vol 49 (1) ◽  
Author(s):  
Martin Knez ◽  
Tadej Slabe ◽  
Mirka Trajanova ◽  
Tatiana Akimova ◽  
Igor Kalmiykov
Keyword(s):  
Carbonate Rocks ◽  
Textural Properties ◽  
Seasonal Temperature ◽  
Chemical Dissolution ◽  
Altai Mountains ◽  
Altai Republic ◽  
Temperature Variations ◽  
Peeling Off ◽  
Continental Climate ◽  
Mineral Constituents

A comparison of karren formation on various rocks under diverse environmental conditions makes an important contribution to our understanding of the formation and development of karst. In this regard, the present study brings a number of new insights through description of the karst development on marbles at the foothills of the Altai Mountains. We studied karst phenomena in the field and in the laboratory where structural-textural properties, mineral composition and quantity of carbonate components were determined. Rivers dissected karst surface and additionally uncovered carbonate rocks. The marble layers are faulted, folded and sheared, consequently containing numerous densely spaced net of discontinuities, which are often parallel. Brittle deformations significantly increased the rocks’ porosity, consequently making it more sensitive to water absorption and freezing thaw effect. Distinct continental climate, with extreme daily and seasonal temperature variations, conditions the pronounced peeling off of the marbles along discontinuities. The diversity of disintegration is conditioned by the massive or oriented structure, cleavage, texture, and type and grain size of the marbles’ mineral constituents. Interaction and alternation of chemical dissolution and mechanical disintegration play the major role on the karren formation and its preservation. The formed karren is mostly destroyed due to peeling off and disintegration of the marbles.

Seasonal temperature and stress distributions in concrete gravity dams. Part 1: modelling

1993 ◽  
Vol 20 (6) ◽  
pp. 999-1017 ◽  
Author(s):  
P. Léger ◽  
J. Venturelli ◽  
S. S. Bhattacharjee
Keyword(s):  
Finite Element ◽  
Thermal Stresses ◽  
Thermal Response ◽  
Companion Paper ◽  
Seasonal Temperature ◽  
Gravity Dams ◽  
Dam Foundation ◽  
Temperature Variations ◽  
Concrete Gravity Dams ◽  
Northern Regions

Seasonal thermal stresses have been found to contribute significantly to the long-term degradation of strength and stiffness of concrete dams located in northern regions. Temperature variations and the associated thermal stress and strain must be evaluated to define the initial loading conditions for safety analyses and develop defensive measures to ensure the durability of the exposed surfaces. This paper presents a finite element modelling procedure to determine the thermal response of concrete gravity dams. Heat transfer and structural analysis models of a typical dam–foundation–reservoir system are developed. The reservoir, foundation, and air temperature variations, as well as solar radiation, are evaluated from data collected from different sources. The rate of convergence of the numerical solution is examined, and a methodology to identify the critical temperature states and to compute the related stresses is presented. The results of extensive parametric analyses describing the thermal behaviour of concrete gravity dams located in northern regions are presented in a companion paper. Key words: gravity dams, thermal analysis, finite element method.

Analysis of Combustion Time Based on Atmospheric Temperature Variations of a Gas Turbine Engine

2020 ◽  
Vol 25 (3) ◽  
pp. 99-105
Author(s):  
Young-Ho Kim
Keyword(s):  
Gas Turbine ◽  
Combustion Instability ◽  
Atmospheric Temperature ◽  
Gas Turbine Engine ◽  
Normal Operation ◽  
Seasonal Temperature ◽  
Combustion Time ◽  
Temperature Variations ◽  
Turbine Engine ◽  
Initial Starting

In this study, the combustion instability of a gas turbine engine and the associated combustion delay time were analyzed on the basis of atmospheric temperature variations. A power generating device for combat equipment, which is currently being used in the military, was employed as the gas turbine engine. One of the primary functions of combat equipment is to fully demonstrate maneuverability, and the role and importance of power generating devices for ensuring such maneuverability has always been emphasized on. Additionally, to secure the reliability of the power generation device’s starting performance, it is necessary to stabilize various parameters such as the initial starting stability of the engine, the operation rate, and the output power. Owing to the combustion instability caused by seasonal temperature variations, the gas turbine engine employed in this study is one of the important problematic factors affecting engine performance, durability, and operation. Consequently, in several cases, normal operation and usage of the engine were restricted owing to repeated cases. Hence, in this study, the maneuverability and reliability of the equipment were improved by analyzing the changes in combustion time based on atmospheric temperature variations. Furthermore, the operational environment of the equipment is also summarized in this study.

Sign in / Sign up

Export Citation Format

Share Document