- ?T
About the time difference the temperature difference psychrometrics File Delta T.jpg thumb T vs. time from 1657 to 1984 ref IERS Rapid Service Prediction Center c. 1986 . http maia.usno.navy.mil ser7 historic deltat.data Historic Delta T and LOD . Source attributed data to McCarthy and Babcock 1986 . Retrieved December 2009. ref T , Delta T , delta T , deltaT , or DT is the time difference obtained by subtracting Universal Time UT from Terrestrial Time TT T TT UT. Universal Time is a time scale based on the Earth s rotation , which is somewhat irregular over short periods days up to a century , thus any time based on it cannot have an accuracy better than 1 10 small sup 8 sup small . But the principal effect is over the long term over many centuries tidal acceleration tidal friction inexorably slows Earth s rate of rotation by about 2.3 millisecond ms day Century cy . However, there are other forces changing the rotation rate of the Earth. The most important one is believed to be a result of the melting of continental ice sheets at the end of the last glacial period . This removed their tremendous weight, allowing the land under them to begin to rebound upward in the polar regions, which has been continuing and will continue until isostatic equilibrium is reached. This glacial rebound brings mass closer to the rotation axis of the Earth, which makes the Earth spin faster law of angular momentum conservation of angular momentum the rate derived from models is about 0.6 ms day cy. So the net acceleration actually a deceleration of the rotation of the Earth, or the change in the length of the mean solar day LOD , is 1.7 ms day cy. This is indeed the average rate as observed over the past 27 centuries. ref McCarthy & Seidelmann 2009, 88&ndash 89 ref Terrestrial Time is a theoretical uniform time scale, defined to provide continuity with the former Ephemeris Time ET . ET was an independent time variable, proposed and its adoption agreed in the period 1948 52 ... more details
|
- Diamond dust
2379377697 A night photo that presents closer to naked eye observation. Category Psychrometrics Category ... more details
|
- Willis Carrier
. It became known as the Magna Carta of Psychrometrics. This document tied together the concepts ... more details
|
- Clothes line
situation, the process can be traced on a Psychrometrics psychrometric chart . Drying laundry ... more details
|
- Energy tower (downdraft)
Sustainable development Psychrometrics not to be confused with Psychometrics Solar updraft tower ... more details
|
- Vapor barrier
Category Psychrometrics Category Heating, ventilating, and air conditioning cs Paroz brana de ... more details
|
- Moisture analysis
Karl Fischer titration Category Desiccation Category Measurement Category Psychrometrics Category ... more details
|
- Wrightsoft
Radiant, Right Loop, Right Tools, Right Psychrometrics 2001 Right Suite Commercial 5.0 Modules ... more details
|
- Steam
plant s use steam to generate electricity Oxyhydrogen Psychrometrics moist air vapor mixtures, humidity ... more details
|
- Glossary of HVAC terms
and smoke indices. See also plenum chamber term psychrometric main Psychrometrics The study of the behavior ... more details
|
- Evaporative cooler
an understanding of psychrometrics . Evaporative cooling performance is dynamic due to changes in external ... repair.net Air Conditioning Repair Self Help Air Conditioning Repair Category Psychrometrics Category ... more details
|
- Frost
Category Psychrometrics Category Water ice Category Precipitation Category Forms of water ne ... more details
|
- Psychometrics
Distinguish2 psychrometrics , the measurement of the heat and water vapor properties of air For other uses of this term and similar terms Psychometry disambiguation Psychology sidebar Psychometrics is the field of study concerned with the theory and technique of psychological measurement , which includes the measurement of knowledge, abilities, attitudes, Wiktionary personality personality traits, and educational measurement . The field is primarily concerned with the construction and validation of measurement instruments such as questionnaire s, test student assessment tests , and personality assessments. It involves two major research tasks, namely i the construction of instruments and procedures for measurement and ii the development and refinement of theoretical approaches to measurement. Those who practice psychometrics are known as psychometricians. All psychometricians possess a specific psychometric qualification, and while many are clinical psychologists, others work as human resources or learning and development professionals. Origins and background Much of the early theoretical and applied work in psychometrics was undertaken in an attempt to measure intelligence trait intelligence . Francis Galton , often referred to as the father of psychometrics , devised and included mental tests among his anthropometric measures. However, the origin of psychometrics also has connections to the related field of psychophysics . Two other pioneers of psychometrics obtained doctorates in the Leipzig Psychophysics Laboratory under Wilhelm Wundt James McKeen Cattell in 1886 and Charles Spearman in 1906. The psychometrician L. L. Thurstone , founder and first president of the Psychometric Society in 1936, developed and applied a theoretical approach to measurement referred to as the law of comparative judgment , an approach that has close connections to the psychophysical theory of Ernst Heinrich Weber and Gustav Fechner . In addition, Spearman and Thurstone both made important ... more details
|
- Fog
Psychrometrics Link GA de ar an Boira baixa ast Borrina az Duman bn be be x old ... more details
|
- Water vapor
gases Category Atmospheric thermodynamics Category Forms of water Category Water in gas Category Psychrometrics ... more details
|
- Air conditioning
of gas vapor mixtures is called psychrometrics . Energy use In a thermodynamically closed system ... more details
|
- Thermal comfort
Psychrometrics Air conditioning Building insulation Mahoney tables References reflist colwidth 25em ... more details
|
- Passive solar building design
comfort based on heat index , psychrometrics and enthalpy control for buildings to be inhabited by humans ... more details
|
- Heat exchanger
for cooling. Due to psychrometrics , air that is cooled often has moisture condensing out of it, except ... more details
|
- Cooling tower
dew point and psychrometrics . As ambient air is drawn past a flow of water, a small portion of the water ... more details
|
- Underfloor heating
of heaters Hypocaust Kang bed stove Psychrometrics Ondol Renewable heat Room air distribution Underfloor ... more details
|
- Thermodynamics
File Carnot engine hot body working body cold body .jpg thumb Annotated color version of the original 1824 Carnot heat engine showing the hot body boiler , working body system, steam , and cold body water , the letters labeled according to the stopping points in Carnot cycle . Thermodynamics Thermodynamics is the branch of physical science concerned with heat and its relation to other forms of energy and Work thermodynamics work . It defines macroscopic variables such as temperature , entropy , and pressure that describe average properties of material bodies and radiation, and explains how they are related and by what laws they change with time. Thermodynamics does not describe the microscopic constituents of matter, and its laws can be derived from statistical mechanics . Thermodynamics can be applied to a wide variety of topics in science and engineering , such as engines , phase transitions , chemical reactions , transport phenomena , and even black holes . The results of thermodynamics are essential for other fields of physics and for chemistry , chemical engineering , aerospace engineering , mechanical engineering , cell biology , biomedical engineering , materials science , and are useful for other fields such as economics . ref cite book author Smith, J.M. coauthors Van Ness, H.C., Abbott, M.M. title Introduction to Chemical Engineering Thermodynamics publisher McGraw Hill year 2005 isbn 0 07 310445 0 oclc 56491111 ref ref cite book author Haynie, Donald, T. title Biological Thermodynamics publisher Cambridge University Press year 2001 isbn 0 521 79549 4 oclc 43993556 ref Thermodynamics is one of the best logically structured branches of physics and has become one of the classical branches of theoretical physics . Citation needed date March 2012 Much of the empirical content of thermodynamics is contained in its four laws of thermodynamics laws . The first law specifies that energy can be exchanged between physical systems as heat and Work thermodynamics ther ... more details
|
Encyclopedia
top
