Determination of the proton separation energy ofRh93from mass measurements

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
J. Fallis ◽  
J. A. Clark ◽  
K. S. Sharma ◽  
G. Savard ◽  
F. Buchinger ◽  
...  
Keyword(s):  
Separation Energy ◽  
Mass Measurements ◽  
Proton Separation Energy

A new procedure for the determination of soil-water retention curves by continuous drying using high-suction tensiometers

2011 ◽  
Vol 48 (2) ◽  
pp. 327-335 ◽  
Author(s):  
S. D.N. Lourenço ◽  
D. Gallipoli ◽  
D. G. Toll ◽  
C. E. Augarde ◽  
F. D. Evans
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Water Retention ◽  
Soil Water Retention ◽  
Mass Measurements ◽  
Discrete Measurement ◽  
Wetting Process ◽  
High Suction

Soil-water retention curves (SWRCs) can be determined using high-suction tensiometers (HSTs) following two different procedures that involve either continuous or discrete measurement of suction. In the former case, suction measurements are taken while the sample is permanently exposed to the atmosphere and the soil is continuously drying. In the latter case, the drying or wetting process is halted at different stages to ensure equalization within the sample before measuring suction. Continuous drying has the advantage of being faster; however, it has the disadvantage that the accuracy of mass measurements (necessary for the determination of water content) is affected by the weight and stiffness of the cable connecting the HST to the logger. To overcome this problem, an alternative continuous drying procedure is presented in this paper in which two separate but nominally identical samples are used to obtain a single SWRC; one sample is used for the mass measurements, while a second sample is used for suction measurements. It is demonstrated that the new continuous drying procedure gives SWRCs that are similar to those obtained by discrete drying.

PARTICLE-NUMBER PROJECTED TWO-PROTON SEPARATION ENERGY OF THE PROTON-RICH EVEN–EVEN RARE-EARTH NUCLEI USING AN ISOVECTOR PAIRING APPROACH

2009 ◽  
Vol 18 (01) ◽  
pp. 141-160 ◽  
Author(s):  
S. KERROUCHI ◽  
D. MOKHTARI ◽  
N. H. ALLAL ◽  
M. FELLAH
Keyword(s):  
Rare Earth ◽  
Particle Number ◽  
Drip Line ◽  
Separation Energy ◽  
Line Position ◽  
Proton Separation Energy ◽  
Rare Earth Nuclei ◽  
Pairing Correlations ◽  
The One ◽  
Almost All

The two-proton separation energy (S2P) has been studied by describing the pairing correlations using four various approaches: in the pairing between like-particles case with (SBCS) and without (BCS) inclusion of the particle-number projection, as well as in the isovector pairing case with (NP-PROJ) and without (NP) inclusion of the particle-number projection. It has been numerically evaluated for the even–even rare-earth proton-rich nuclei such as Δnp ≠ 0. Among the four used methods, NP-PROJ is the one that provides the results that are closest to the experimental data when available. On the other hand, it has been shown that the S2P values deduced from the four approaches join, for almost all the considered elements, for the highest values of (N - Z). The fact that the BCS and NP (respectively, SBCS and NP-PROJ) values join may be explained by the fact that Δnp decreases with increasing values of (N - Z). It has also been shown that the BCS and SBCS (respectively, NP and NP-PROJ) values of S2P are very close because the discrepancy between the projected and unprojected energy values is quasi-constant as a function of the deformation. Finally, the four used methods lead to the same prediction of the two-proton drip-line position except for the Dysprosium and the Tungsten.

scholarly journals PROTON DRIPLINE FOR ISOTONE N = 18, 20, AND 22 USING MODIFIED RELATIVISTIC MEAN FIELD (MRMF) MODEL

2019 ◽  
Vol 4 (1) ◽  
pp. 1-10
Author(s):  
Jenny Primanita Diningrum ◽  
Anto Sulaksono
Keyword(s):  
Fermi Energy ◽  
Calculation Result ◽  
Research Result ◽  
Mean Field ◽  
Separation Energy ◽  
Relativistic Mean Field ◽  
Proton Separation Energy ◽  
Position Prediction

Determining the position of one- and two-proton dripline for isotone of N = 18, 20, and 22 has been studied through Modified Relativistic Mean Field (MRMF). The model exemplifies three impacts, namely isovector-isoscalar coupling, tensors, and electromagnetic exchange through five parameter set variations. The position of one- and two-proton dripline for the isotones is predicted by applying two methods, which are two-proton separation energy, and Fermi energy. The research shows that the prediction of one- and two-proton dripline for isotone of N = 18, and N = 20 is positioned at Z = 22 and Z = 26 consecutively.  Then, the prediction of one- and two-proton dripline for isotone of N = 22 has two positions, Z = 26 and Z = 28. The calculation result indicates that the position prediction for isotone of N = 18, N = 20, and N = 22 is following the research result conducted by Nazarewicz with RMF+NLSH model [1]. Meanwhile, isovector-isoscalar coupling, tensors, and electromagnetic exchange do not affect massively for the position prediction of two-proton dripline. However, the three methods affect one-proton dripline.

Electron impact studies. I. High resolution mass spectra of some unsaturated cyclic ketones

1966 ◽  
Vol 19 (9) ◽  
pp. 1619 ◽  
Author(s):  
JH Bowie
Keyword(s):  
High Resolution ◽  
Electron Impact ◽  
Mass Spectra ◽  
Cyclic Ketones ◽  
Mass Measurements ◽  
Exact Mass ◽  
Characteristic Fragmentation ◽  
Fragmentation Processes ◽  
Resolution Mass

The mass spectra of some 2-cyclohexen-1-ones, tetralones, and indanones have been investigated. The characteristic fragmentation processes, substantiated by appropriate metastable peaks, exact mass measurements, and in some cases by deuterium labelling studies, greatly facilitate the determination of both the type of system and the position of substituents on that system.

Proton Separation Energies for Some Rare Earth Isotopes

1975 ◽  
Vol 53 (10) ◽  
pp. 948-953 ◽  
Author(s):  
D. G. Burke ◽  
J. M. Balogh
Keyword(s):  
Rare Earth ◽  
Proton Transfer ◽  
Transfer Reactions ◽  
Separation Energy ◽  
Single Proton ◽  
Proton Separation Energy ◽  
Proton Transfer Reactions ◽  
The Absolute ◽  
Q Values

Reaction Q values for the (3He,d) and (α,t) single proton transfer reactions on targets of Gd, Dy, Er, and Yb have been measured with a magnetic spectrograph. Proton separation energies, Sp, are presented for 156,157,158,159,161Tb, 161,162,163,164,165Ho, 165,167,168,169,171Tm, and 171,172,173,174,175,177Lu. Although the uncertainties of the absolute Q values are approximately 15 keV, the use of isotopically mixed and natural targets resulted in probable errors of only 1–3 keV for the differences in Q values of the isotopes identified in each target. As the proton separation energy was previously known to within 1–3 keV for one isotope of each element studied, it is now possible to present SP values with errors of a few keV for ail the nuclides listed above.

Precision Determination of theC12-C13Neutron Separation Energy

1967 ◽  
Vol 161 (4) ◽  
pp. 1080-1082 ◽  
Author(s):  
W. V. Prestwich ◽  
R. E. Coté ◽  
G. E. Thomas
Keyword(s):  
Separation Energy ◽  
Precision Determination

Precise determination of aquatic plant wet mass using a salad spinner

2016 ◽  
Vol 73 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Tobias Oliver Bickel ◽  
Christine Perrett
Keyword(s):  
Aquatic Plant ◽  
Plant Biomass ◽  
Dry Mass ◽  
Precise Determination ◽  
Freshwater Ecosystems ◽  
Mass Measurements ◽  
Accuracy And Precision ◽  
Reliable Assessment ◽  
Macrophyte Species

The reliable assessment of macrophyte biomass is fundamental for ecological research and management of freshwater ecosystems. While dry mass is routinely used to determine aquatic plant biomass, wet (fresh) mass can be more practical. We tested the accuracy and precision of wet mass measurements by using a salad spinner to remove surface water from four macrophyte species differing in growth form and architectural complexity. The salad spinner aided in making precise and accurate wet mass with less than 3% error. There was also little difference between operators, with a user bias estimated to be below 5%. To achieve this level of precision, only 10–20 turns of the salad spinner are needed. Therefore, wet mass of a sample can be determined in less than 1 min. We demonstrated that a salad spinner is a rapid and economical technique to enable precise and accurate macrophyte wet mass measurements and is particularly suitable for experimental work. The method will also be useful for fieldwork in situations when sample sizes are not overly large.

scholarly journals Experimental Analysis on Shrinkage and Swelling in Ordinary Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Barbara Kucharczyková ◽  
Petr Daněk ◽  
Dalibor Kocáb ◽  
Petr Misák
Keyword(s):  
Water Evaporation ◽  
Mass Measurements ◽  
Volume Changes ◽  
Ordinary Concrete ◽  
Concrete Shrinkage ◽  
Concrete Mixtures ◽  
Mass Losses ◽  
Shrinkage And Swelling ◽  
Loss Of Mass

The paper deals with the experimental determination of shrinkage development during concrete ageing. Three concrete mixtures were made. They differed in the amount of cement in the fresh mixture, 300, 350, and 400 kg/m3. In order to determine the influence of plasticiser on the progress of volume changes, another three concrete mixtures were prepared with plasticiser in the amount of 0.25% by cement mass. Measurements were performed with the goal of observing the influence of cement and plasticiser content on the overall development of volume changes in the concrete. Changes in length and mass losses of the concrete during ageing were measured simultaneously. The continuous measurement of concrete mass losses caused by drying of the specimen’s surface proved useful during the interpretation of results obtained from the concrete shrinkage measurement. During the first 24 hours of ageing, all the concrete mixtures exhibited swelling. Its magnitude and progress were influenced by cement, water, and plasticiser content. However, a loss of mass caused by water evaporation from the surface of the specimens was also recorded in this stage. The measured progress of shrinkage corresponded well to the progress of mass loss.

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