SENSITIVE SOLVATION METHOD FOR SEPARATION SO DETERMINATION OF ZINC(II) AND CADMIUM(II) IN DIFFERENT SAMPLES.

ABSTRACTObjective: Separation and extraction of Zn(II) and Cd(II) as a neutral compound by used methyl stearate as extractant dissolved in chloroform.Methods: Applications of separation and extraction according to solvation method from nitrate aqueous solution by used methyl stearate which isbinding coordinally with nitrate salt of metal under study Zn(II) and Cd(II).Results: The extracted species have λmax=263 nm for Zn2+ and λmax=346 nm for Cd. The studies about limitation optimum condition for extractionshow 0.3 M salting out effect KNO3 for Zn2+ and 0.7 M KNO3 for Cd2+2+ in present 100 µg Zn2+/5 ml and 50 µg Cd/5 ml with optimum shaking time15 minutes for both ions.2+Conclusion: The separation by solvation method shows high sensitivity and selectivity in addition to high extraction efficiency for separation Zn(II)and Cd(II). As well illustrate the important rule of kind and concentration of salting out agent and different extractions efficiency with differ extractant.Key words: Solvation method, Separation and determination, Zinc(II), Cadmium

Field Behavior of Retained Earth Structure

This paper describes a case study of a Retained Earth system constructed for the on- and off-ramps of a grade separation structure in Hayward, California. Field strain gage readings of reinforcing meshes were recorded at two instrumented sites. The results were closely examined and analyzed to assess the current design procedure. Based upon the information gathered, it was concluded that the field performance behavior of the system seems to justify the current general design procedure. However, it was also noted that the design of earth reinforced structures is complicated due to the interaction between the reinforcing elements and the surrounding soil; therefore, field instrumentation, performance behavior documentation and analysis are vitally important to ensure safe and economic design

AC Conductivity and Dielectric Properties of Cu–Zn ferrites

In this work, we have studied the effects of the 2 Zn ions on the electric and the dielectric properties of the Cu spinel ferrite. The mixed Cu-Zn spinel ferrite, of chemical formula 1 s s 2 4 Cu Zn Fe O , where s stepped by 0.2 according to ( 0.0 s 1.0), were prepared from purity metal oxides using the standard ceramic preparation. The AC conductivity was determined for the ferrite samples in the applied frequency range (10 10 )Hz 4 6 . In this range of frequency, the AC conductivity increases rapidly as a function of the applied frequency. The dielectric properties for the ferrite samples were also determined at room temperature. The general trend for all samples was found to decrease continuously with increasing of the applied frequency. The measurements of the electric and the dielectric properties show that, the behavior of the ferrite samples is similar to that of the semiconductor materials. The results of the electric and dielectric properties are inadequate to previous studies for various ferrite compounds. The electric conductivity for the samples was explained using the electron hopping model.In this work, we have studied the effects of the 2 Zn ions on the electric and the dielectric properties of the Cu spinel ferrite. The mixed Cu-Zn spinel ferrite, of chemical formula 1 s s 2 4 Cu Zn Fe O , where s stepped by 0.2 according to ( 0.0 s 1.0), were prepared from purity metal oxides using the standard ceramic preparation. The AC conductivity was determined for the ferrite samples in the applied frequency range (10 10 )Hz 4 6 . In this range of frequency, the AC conductivity increases rapidly as a function of the applied frequency. The dielectric properties for the ferrite samples were also determined at room temperature. The general trend for all samples was found to decrease continuously with increasing of the applied frequency. The measurements of the electric and the dielectric properties show that, the behavior of the ferrite samples is similar to that of the semiconductor materials. The results of the electric and dielectric properties are inadequate to previous studies for various ferrite compounds. The electric conductivity for the samples was explained using the electron hopping model

Attenuation in Rectangular Waveguides with Finite Conductivity Walls

We present a fundamental and accurate approach to compute the attenuation of electromagnetic waves propagating in rectangular waveguides with finite conductivity walls. The wavenumbers kx and ky in the x and y directions respectively, are obtained as roots of a set of transcendental equations derived by matching the tangential component of the electric field (E) and the magnetic field (H) at the surface of the waveguide walls. The electrical properties of the wall material are determined by the complex permittivity ε, permeability μ, and conductivity σ. We have examined the validity of our model by carrying out measurements on the loss arising from the fundamental TE10 mode near the cutoff frequency. We also found good agreement between our results and those obtained by others including Papadopoulos’ perturbation method across a wide range of frequencies, in particular in the vicinity of cutoff. In the presence of degenerate modes however, our method gives higher losses, which we attribute to the coupling between modes as a result of dispersion

Negative Differential Resistance, Memory and Reconfigurable Logic Functions based on Monolayer Devices derived from Gold Nanoparticles Functionalized with Electro-polymerizable Thiophene-EDOT Units

We report on hybrid memristive devices made of a network of gold nanoparticles (10 nm diameter) functionalized by tailored 3,4(ethylenedioxy)thiophene (TEDOT) molecules, deposited between two planar electrodes with nanometer and micrometer gaps (100 nm to 10 um apart), and electropolymerized in situ to form a monolayer film of conjugated polymer with embedded gold nanoparticles (AuNPs). Electrical properties of these films exhibit two interesting behaviors: (i) a NDR (negative differential resistance) behavior with a peak/valley ratio up to 17, and (ii) a memory behavior with an ON/OFF current ratio of about 1E3 to 1E4. A careful study of the switching dynamics and programming voltage window is conducted demonstrating a non-volatile memory. The data retention of the ON and OFF states is stable (tested up to 24h), well controlled by the voltage and preserved when repeating the switching cycles (800 in this study). We demonstrate reconfigurable Boolean functions in multiterminal connected NP molecule devices.Comment: Full manuscript, figures and supporting information, J. Phys. Chem. C, on line, asap (2017

Clinical and Laboratory Profiles of 109 Patients diagnosed as Multiple Myeloma in Erbil City.

Background: Multiple myeloma is characterized by clonal expansion and accumulation of abnormal plasma cells in the bone marrow compartment. This study was conducted to determine the frequency and hematological presentation of multiple myeloma in Nanakaly Hospital in Erbil city. patients and Methods: This descriptive retrospective study was carried out at Nanakaly Hospital over a period of six years from January 2007 to August 2012. A total of 109 patients who were diagnosed with multiple myeloma all were included to analyze the clinical and laboratory profiles. All patients were selected based on preset diagnostic criteria by the WHO. Results: The study showed a male: female ratio of 1:1.1, the mean age of male patients was 57.8 years and for females were 57.9. Backache was the most frequent presentation (41.28%) of the patient then bone pain (33.94%), followed by pallor (10.1%) and bone mass (9.2%). The hematological findings showed anemia in 72% patients. Forty five percent of the bone marrow nucleated cells were plasma cells. Conclusions: Males are affected equally to females by multiple myeloma. Majority of patients present with backache, bone pain and anemia

2D Molecular Dynamics Simulation of Solitons Interaction in Dusty Plasma

Molecular Dynamics (MD) method is used to simulate a dusty plasma system as a one component plasma (OCP).  The heavy dust particles are considered as discrete particles interacting with each other through the Yukawa potential. This assumption is justified by the screening effect due to the lighter plasma components (electrons and ions). Solitons excitation at different values of the Coulomb coupling parameter (Γ) is simulated. The formation of solitons in the system using electric field pulse in a narrow region is studied. Different scenarios of the interaction of solitons are studied for: A) Two solitons with the same amplitude and opposite directions.  B) Two solitons with different amplitudes and opposite directions.  C) Two solitons with different amplitudes and propagating in the same direction

Comparing the performance of 850 GHz integrated bias-tee superconductor-insulator-superconductor (SIS) mixers with single- and parallel-junction tuner

We present and compare the design and performance of two 850 GHz radial probe fed superconductor-insulator-superconductor mixers, where the antenna is aligned perpendicular to the E-Plane of the input full-height rectangular waveguide connected to a multiple flare-angles smooth-walled horn. Both designs are comprised of 0.5 µm2 hybrid niobium/aluminium-nitride/niobium-nitride tunnel junction, fabricated on top of a niobium titanium nitride ground plane with an Al wiring layer. The entire superconducting circuit is supported with a 40 µm thick quartz substrate. The major difference between the two designs is the method used to cancel out the parasitic junction capacitance for broadband performance. The first design utilises two identical junctions connected in parallel with a short transmission line to convert the capacitance of one junction into the equivalent inductance of the other junction, commonly known as the twin-junction tuning scheme; whilst the second design employs an end-loaded scheme with only one tunnel junction. We found that both methods offer similar radio frequency performances, with close to 2× the double sideband quantum noise temperature, but the twin-junction design is more resilient to fabrication tolerances. However, the end-loaded design offers a much better intermediate frequency (IF) bandwidth performance, made possible by the sub-micron and high current density tunnel junction technology. The improved IF performance is important for many millimetre (mm) and sub-mm observatories, such as future upgrades of Atacama Large Millimetre/sub-mm Array receivers, as well as forthcoming space-borne far-infrared missions. Therefore, we conclude that the single-junction mixer design is the preferred option for THz applications, as long as the fabrication error can be minimised within a certain limit