Concentration profiles in the electrodeposition of copper ferrocyanide by laser interferometry

1987 ◽  
Vol 65 (9) ◽  
pp. 2009-2012 ◽  
Author(s):  
R. N. O'Brien ◽  
K. S. V. Santhanam
Keyword(s):  
Laser Interferometry ◽  
Potassium Ferrocyanide ◽  
Slow Rotation ◽  
Concentration Profiles ◽  
Cupric Ion ◽  
Beam Laser ◽  
Paramagnetic Solution ◽  
Initial Resistance ◽  
Molecular Layers ◽  
Precipitate Layer

The electrodeposition of cupric ferrocyanide from a solution of potassium ferrocyanide with the convection-free parallel plane horizontal electrodes with the cathode over the anode was followed by multiple beam laser interferometry as well as the conventional electrochemical instrumentation. It is considered that the cupric ion generated immediately reacts with ferrocyanide ion to form a conducting adhering precipitate layer. The initial resistance of this layer is low. Its resistance is constant with thickness until about 5 × 10−8 C mm2 has been passed probably representing ~105 molecular layers when the resistance begins to rise. A magnetic field of 0.47 T caused a slight decrease in the resistance of the cell probably due to slow rotation of the inhomogeneous paramagnetic solution. This coating may be useful as an electrode.

scholarly journals Testing Sorption Properties of Halloysite by Means of the Laser Interferometry Method

2015 ◽  
Vol 37 (1) ◽  
pp. 43-47
Author(s):  
Sławomir Wąsik ◽  
Michał Arabski ◽  
Karolina Maciejec ◽  
Grażyna Suchanek ◽  
Anna Świercz
Keyword(s):  
Concentration Field ◽  
Laser Interferometry ◽  
Membrane System ◽  
Absorption Capacity ◽  
Sorption Properties ◽  
Concentration Profiles ◽  
Adsorbed Substance ◽  
Interferometry Method ◽  
Set Up ◽  
Kinetics Of

The objective of the present study has been to test the laser interferometry method in terms of its usability for investigating sorption properties of minerals. This method was used to test the absorption capacity of halloysite with reference to glucose, which is often found in industrial wastewater and whose excess can disturb the environmental eco-balance. The sorption capacity of halloysite was thus determined indirectly, basing on the comparison of concentration profiles as well as time characteristics of glucose quantities released from the control solution and from the solution incubated with a halloysite adsorbent. An analysis of glucose diffusion was conducted in a two-chamber membrane system. On the basis of the obtained concentration profiles, the evolution of the concentration field was determined; so were the removal efficiency (%) and the amount of glucose adsorbed at equilibrium (qe, mg/g). The obtained results confirm good sorption properties of halloysite with respect to the investigated substance as well as usability of the method for this kind of investigations. The presented tests suggest that the measurement set-up can be optimised in such as way that visual rendering and testing the kinetics of the adsorbed substance direct release from the studied material become possible.

scholarly journals Forward scattering in two-beam laser interferometry

Metrologia ◽  
2018 ◽  
Vol 55 (2) ◽  
pp. 222-228 ◽  
Author(s):  
G Mana ◽  
E Massa ◽  
C P Sasso
Keyword(s):  
Laser Interferometry ◽  
Forward Scattering ◽  
Beam Laser

Electrode size dependence of piezoelectric response of lead zirconate titanate thin films measured by double beam laser interferometry

2013 ◽  
Vol 103 (13) ◽  
pp. 132904 ◽  
Author(s):  
S. Sivaramakrishnan ◽  
P. Mardilovich ◽  
A. Mason ◽  
A. Roelofs ◽  
T. Schmitz-Kempen ◽  
...  
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Size Dependence ◽  
Laser Interferometry ◽  
Lead Zirconate ◽  
Piezoelectric Response ◽  
Electrode Size ◽  
Beam Laser ◽  
Zirconate Titanate ◽  
Double Beam

Statistical Study of the Rotation Effect of Am Stars

1976 ◽  
Vol 32 ◽  
pp. 675-683
Author(s):  
Keiichi Kodaira
Keyword(s):  
Statistical Study ◽  
Rotation Velocity ◽  
General View ◽  
Slow Rotation ◽  
Rotation Effect

SummaryExcess of [m1] index of Am stars, relative to normal stars, is statistically found to be correlated with rotation velocity; the coefficient is estimated at ∆׀m1׀ /∆V(km/sec) ˜ - 0.0007 among Am stars. This result supports the general view that slow rotation is essential for Am phenomena.

Suicide Attempts During Adolescence: Systematic Hospitalization and Crisis Treatment

Crisis ◽  
1999 ◽  
Vol 20 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Jérôme Ottino
Keyword(s):  
Attempted Suicide ◽  
Suicide Attempts ◽  
Psychiatric Treatment ◽  
Health Workers ◽  
Inpatient Unit ◽  
Theoretical Hypothesis ◽  
Initial Resistance ◽  
Provision Of Care ◽  
Suicidal Crisis

This paper deals with an inpatient unit that recently opened in Geneva, specializing in the treatment of patients aged 16-21 years who had attempted suicide or felt the desire to commit suicide. This particular center was established because of the significant weaknesses found in the provision of care to adolescents who had attempted suicide. Despite the growing interest of health workers in this area of study over recent years, the frequency of suicide among the young has not decreased and there are numerous recurrences of the suicide attempts. Further, all efforts to improve the adolescents' compliance with psychiatric treatment have failed to date. The number of drop-outs from treatment is still very high. Thus, the objectives of our inpatient unit are as follows: (1) to overcome initial resistance to treatment and to improve long-term compliance; (2) to decrease the number of recurrent attempts as a consequence of the above, thus increasing life expectancy; (3) to offer the adolescents who have tried (or have contemplated) committing suicide an improved quality of life, after first helping them overcome the suicidal crisis. To achieve these goals, the therapeutic team of the unit proposes short stays during which the work with the adolescents consists of a very intensive psychoanalytic-oriented crisis intervention. Numerous practical aspects of our therapeutic approach in the inpatient unit are related here in detail, always with reference to our theoretical hypothesis.

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