Hydrogen Gas Solubility in the Dimethyl Sulfoxide – Water System: A Further Clue to Solvent Structure in These Media

1971 ◽  
Vol 49 (24) ◽  
pp. 3940-3947 ◽  
Author(s):  
E. A. Symons
Keyword(s):  
Dimethyl Sulfoxide ◽  
Water System ◽  
Hydrogen Gas ◽  
Maximum Deviation ◽  
Gas Solubility ◽  
Temperature Dependent ◽  
Composition Region ◽  
Ideal Behavior ◽  
System A ◽  
Molar Scale

The solubility of hydrogen gas in the dimethyl sulfoxide (DMSO) – water system has been measured as a function of temperature from 25 to 80 °C. A distinct minimum occurs in the solubility, as expressed on the molar scale, in the region 25–35 mol% DMSO at 25 °C. As the temperature is raised towards 80 °C the minimum becomes less pronounced. The maximum deviation from calculated "ideal" behavior is found at 32 ± 5, 35 ± 5, and 32 ± 5 mol% DMSO for 25, 50, and 80 °C, respectively.A maximum is observed for both the partial molal entropy and heat of solution of hydrogen in the same solvent composition region. These results are discussed in terms of a changing entropy and energy of hole formation in the solvent with composition, which in turn is related to DMSO–water interaction in solution.A temperature-dependent equilibrium between DMSO•2H2O and DMSO•3H2O complexes in solution is proposed in an attempt to correlate the considerable data which have been reported in the literature for the DMSO–water system. The second complex is thought to be present in significant quantity only at temperatures well below 25 °C.

Emergence of size induced metallic state in the ferromagnetic insulating Pr0.8Sr0.2MnO3 manganite: Breaking of surface polarons

2015 ◽  
Vol 8 (2) ◽  
pp. 2084-2093 ◽  
Author(s):  
PROLOY TARAN DAS ◽  
Arun Kumar Nigam ◽  
Tapan Kumar Nath
Keyword(s):  
Transport Properties ◽  
Metallic State ◽  
Temperature Dependent ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
System A ◽  
Surface Disorder ◽  
Bulk System ◽  
Magnetic Transport ◽  
Grain Surface

Nano-dimensional effects on electronic-, magneto-transport properties of granular ferromagnetic insulating (FMI) Pr0.8Sr0.2MnO3 (PSMO) manganite (down to 40 nm) have been investigated in details. From the electronic and magnetic transport properties, a metallic state has been observed in grain size modulation by suppressing the ferromagnetic insulating state of PSMO bulk system. A distinct metal-insulator transition (MIT) temperature around 150 K has been observed in all nanometric samples. The observed insulator to metallic transition with size reduction can be explained with surface polaron breaking model, originates due to enhanced grain surface disorder. This proposed phenomenological polaronic model plays a significant role to understand the polaronic destabilization process on the grain surface regime of these phase separated nano-mangnatie systems. Temperature dependent resistivity and magnetoresistance data in presence of external magnetic fields are investigated in details with various compatible models.

California's Stressed Water System: A Primer

Weatherwise ◽  
2016 ◽  
Vol 70 (1) ◽  
pp. 12-19
Author(s):  
Jan Null
Keyword(s):  
Water System ◽  
System A

scholarly journals Error Correction for FSI-Based System without Cooperative Target Using an Adaptive Filtering Method and a Phase-Matching Mosaic Algorithm

2018 ◽  
Vol 8 (10) ◽  
pp. 1954 ◽  
Author(s):  
Xing-Ting Xiong ◽  
Xing-Hua Qu ◽  
Fu-Min Zhang
Keyword(s):  
Adaptive Filtering ◽  
Signal To Noise Ratio ◽  
Incident Angle ◽  
External Cavity ◽  
Phase Matching ◽  
Maximum Deviation ◽  
External Cavity Laser ◽  
Filtering Method ◽  
System A ◽  
Sampling Points

In our frequency scanning interferometry-based (FSI-based) absolute distance measurement system, a frequency sampling method is used to eliminate the influence of laser tuning nonlinearity. However, because the external cavity laser (ECL) has been used for five years, factors such as the mode hopping of the ECL and the low signal-to-noise ratio (SNR) in a non-cooperative target measurement bring new problems, including erroneous sampling points, phase jumps, and interfering signals. This article analyzes the impacts of the erroneous sampling points and interfering signals on the accuracy of measurement, and then proposes an adaptive filtering method to eliminate the influence. In addition, a phase-matching mosaic algorithm is used to eliminate the phase jump, and a segmentation mosaic algorithm is used to improve the data processing speed. The result of the simulation proves the efficiency of our method. In experiments, the measured target was located at eight different positions on a precise guide rail, and the incident angle was 12 degrees. The maximum deviation of the measured results between the FSI-based system and the He-Ne interferometer was 9.6 μm, and the maximum mean square error of our method was 2.4 μm, which approached the Cramer-Rao lower bound (CRLB) of 0.8 μm.

scholarly journals Dynamics in the Hydrogen Cyanide -- Water System. A Carbon-13 NMR Study.

1992 ◽  
Vol 46 ◽  
pp. 142-146 ◽  
Author(s):  
István Banyai ◽  
Johan Blixt ◽  
Julius Glaser ◽  
Imre Tóth ◽  
Susan Jagner ◽  
...  
Keyword(s):  
Hydrogen Cyanide ◽  
Water System ◽  
System A ◽  
Nmr Study

Phase separation in a PSf/DMF/water system: a proposed mechanism for macrovoid formation

RSC Advances ◽  
2014 ◽  
Vol 4 (80) ◽  
pp. 42391-42402 ◽  
Author(s):  
Lei Yu ◽  
Feng Yang ◽  
Ming Xiang
Keyword(s):  
Phase Separation ◽  
Water System ◽  
System A

The formation of polysulfone (PSf) membranes from the PSf/N,N-dimethylformamide (DMF)/water system was studied with optical microscopic observations.

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