Very high Q microwave spectroscopy on trapped /sup 171/Yb/sup +/ ions: application as a frequency standard

1995 ◽  
Vol 44 (2) ◽  
pp. 113-116 ◽  
Author(s):  
P.T.H. Fisk ◽  
M.J. Sellars ◽  
M.A. Lawn ◽  
C. Coles ◽  
A.G. Mann ◽  
...  
Keyword(s):  
Frequency Standard ◽  
Microwave Spectroscopy ◽  
High Q ◽  
Very High

CANADIAN STANDARD OF FREQUENCY

1959 ◽  
Vol 37 (1) ◽  
pp. 10-18 ◽  
Author(s):  
S. N. Kalra ◽  
C. F. Pattenson ◽  
M. M. Thomson
Keyword(s):  
High Precision ◽  
Phase Measurement ◽  
Frequency Standard ◽  
Frequency Stability ◽  
Absolute Frequency ◽  
Standard Frequency ◽  
Astronomical Observations ◽  
The Past ◽  
Time Signals ◽  
Very High

Over the past 3 years a frequency standard of very high precision has been installed in Canada. It is composed of equipment located in three different laboratories in Ottawa, Ontario, but separated by a few miles. Intercomparison of frequency between these laboratories, which is done by sending signals over telephone lines and related techniques, is briefly described. Results indicate frequency stability of about 2:1010 over short and long periods. Absolute frequency is determined from astronomical observations. International inter-comparison is carried out by phase measurement of standard frequency and by observations of time signals; some of the results are presented.

Exact trapping state dynamics for the 85Rb atom micromaser at very high Q and/or very low T

1996 ◽  
Author(s):  
Amitabh Joshi ◽  
A. Kremid ◽  
N. Nayak ◽  
B. V. Thompson ◽  
R. K. Bullough
Keyword(s):  
High Q ◽  
Very High ◽  
Trapping State

A loss mechanism study of a very high Q silicon micromechanical oscillator

2005 ◽  
Vol 97 (2) ◽  
pp. 023524 ◽  
Author(s):  
Xiao Liu ◽  
J. F. Vignola ◽  
H. J. Simpson ◽  
B. R. Lemon ◽  
B. H. Houston ◽  
...  
Keyword(s):  
Mechanism Study ◽  
Loss Mechanism ◽  
High Q ◽  
Very High

Soil zinc and its uptake by plants. II. Soil chemistry in relation to prediction of availability

Soil Research ◽  
1972 ◽  
Vol 10 (2) ◽  
pp. 165 ◽  
Author(s):  
KG Tiller ◽  
JL Honeysett ◽  
Vries MPC De
Keyword(s):  
Soil Chemistry ◽  
Zinc Concentration ◽  
Alkaline Soils ◽  
Acidic Soils ◽  
High Q ◽  
Unit Slope ◽  
Plant Data ◽  
Very High ◽  
Soil Groups ◽  
Soil Zinc

Representatives of nine soil groups were extracted with reagents that have been used to predict zinc deficiency. The amounts of soil zinc removed were discussed in terms of specific and non-specific bonding in relation to the reagent used. The desorption of natural zinc was also described in terms of the quantity/intensity (Q/I) relation and an equilibrium zinc concentration (ZnQ) at natural pH. The ZnQ values varied from 1 to 4 �gI. for the alkaline soils and 8-190 pg/l. for the acidic soils. The Q/I ratio was derived by radioisotopic and chemical isotherm procedures. Log Q/I (I = total soluble zinc) approximated closely a linear relation of unit slope with pH. This was ascnbed to a common reation of zinc with all soils by specific sorption dominated by ZnOHA ions such that Q/I� = constant where I' = (ZnOH+aq). Deviations from this relation are discussed. The relations between soil and plant (clover and wheat) variables were studied by simple and multiple regression analysis. Single values of intensity variables, and, to a lesser extent, Q/I variables, correlated well with plant data but not the quantity variables. The improved correlations of Q variables when combined with Q/I variables accorded with published work. The problem of predicting zinc availability on alkaline soils which are dominated by very high Q/I values, is discussed.

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