Associating Behavior of Mixed Liquids: Dielectric Properties of the Ethane-1,2-Diol+1,4-Dioxan Solvent System From -10 to +80°C

1995 ◽  
Vol 48 (6) ◽  
pp. 1193 ◽  
Author(s):  
F Corradini ◽  
A Marchetti ◽  
M Tagliazucchi ◽  
L Tassi ◽  
G Tosi
Keyword(s):  
Dielectric Properties ◽  
Complex Formation ◽  
Binary Mixtures ◽  
Relative Permittivity ◽  
Solvent System ◽  
Quantitative Information ◽  
Experimental Measurements ◽  
Empirical Equations ◽  
Qualitative And Quantitative ◽  
Temperature Range

The associating behaviour of ethane-1,2-diol (component 1)+1,4-dioxan (component 2) in their binary mixtures has been investigated through their dielectric properties. The experimental measurements of the relative permittivity (є) in the temperature range -10 ≤ X1 ≤ 80 for nine binary mixtures covering the whole miscibility field 0 ≤ X1 ≤ 1 have been utilized to test empirical equations representing the functions є = є(T), є = є (X1) and є = є(T,X1). Furthermore, the excess mixing function, єE, has been evaluated to obtain qualitative and quantitative information about the possibility of 'solvent- cosolvent ' complex formation.

Densities and Excess Molar Volumes of 2-Methoxyethanol/Water Binary Mixtures

1992 ◽  
Vol 45 (7) ◽  
pp. 1109 ◽  
Author(s):  
F Corradini ◽  
G Franchini ◽  
L Marcheselli ◽  
L Tassi ◽  
G Tosi
Keyword(s):  
Experimental Data ◽  
Binary Mixtures ◽  
Excess Volume ◽  
Composition Range ◽  
Excess Molar Volumes ◽  
Solvent System ◽  
Molar Volumes ◽  
Temperature Range ◽  
Empirical Relations ◽  
Kister Equation

Densities (ρ) are reported for the 2-methoxyethanol (component l)/water (component 2) solvent system, over the full composition range (0 ≤ X1 ≤ 1) at temperatures (t) from -10 to +80�C. The experimental data have been fitted by three empirical relations that represent the functions ρ = ρ(t), ρ = ρ(X1), ρ = p(t,X1), and the excess volume values by a Redlich-Kister equation. The 1:2 2-methoxyethanol/water adduct appears to be stable throughout the temperature range.

In situ microprobe quantitation of inorganic particle burden in paraffin sections of lung tissue

1988 ◽  
Vol 46 ◽  
pp. 990-991
Author(s):  
Jerrold L. Abraham
Keyword(s):  
Lung Tissue ◽  
Quantitative Information ◽  
Particulate Material ◽  
Paraffin Sections ◽  
Tissue Samples ◽  
Qualitative And Quantitative ◽  
The Past ◽  
Quantitative Analyses ◽  
Data Result

Inorganic particulate material of diverse types is present in the ambient and occupational environment, and exposure to such materials is a well recognized cause of some lung disease. To investigate the interaction of inhaled inorganic particulates with the lung it is necessary to obtain quantitative information on the particulate burden of lung tissue in a wide variety of situations. The vast majority of diagnostic and experimental tissue samples (biopsies and autopsies) are fixed with formaldehyde solutions, dehydrated with organic solvents and embedded in paraffin wax. Over the past 16 years, I have attempted to obtain maximal analytical use of such tissue with minimal preparative steps. Unique diagnostic and research data result from both qualitative and quantitative analyses of sections. Most of the data has been related to inhaled inorganic particulates in lungs, but the basic methods are applicable to any tissues. The preparations are primarily designed for SEM use, but they are stable for storage and transport to other laboratories and several other instruments (e.g., for SIMS techniques).

scholarly journals Land Saturation in SE Niger: Triangulating Qualitative and Quantitative Information for Critical Assessment of Land Use Trajectories

Land ◽  
2013 ◽  
Vol 2 (3) ◽  
pp. 508-533 ◽  
Author(s):  
Anette Reenberg ◽  
Issoufou Maman ◽  
Ibrahim Bouzou Moussa ◽  
Bjarne Fog
Keyword(s):  
Land Use ◽  
Quantitative Information ◽  
Critical Assessment ◽  
Qualitative And Quantitative

Effect of TiO2 doping on rapid densification of alumina by plasma activated sintering

1996 ◽  
Vol 11 (5) ◽  
pp. 1144-1148 ◽  
Author(s):  
R. S. Mishra ◽  
A. K. Mukherjee ◽  
K. Yamazaki ◽  
K. Shoda
Keyword(s):  
Dielectric Properties ◽  
Full Density ◽  
Activated Sintering ◽  
Sintering Kinetics ◽  
Temperature Range ◽  
Plasma Activated Sintering

The effects of plasma cycle and TiO2 doping on sintering kinetics during plasma activated sintering (PAS) of γ−Al2O3 have been studied in the temperature range of 1473–1823 K. Multiple plasma cycle leads to higher densification. Also, TiO2 doping enhances the sintering kinetics during PAS. In TiO2 doped specimens, near full density was obtained at 1673 K in less than 6 min using multiple plasma cycle. It is suggested that the dielectric properties of a material are critical for the success of the PAS process.

The result of instrumental analysis of the amount of motion in patients with different occlusive and skeletal classes according to the condylography

2021 ◽  
Vol 1 (38) ◽  
pp. 8-13
Author(s):  
M. G. Soykher ◽  
A. V. Lepilin ◽  
M. I. Soykher ◽  
I. K. Pisarenko ◽  
G. T. Saleeva ◽  
...  
Keyword(s):  
Complex Formation ◽  
Temporomandibular Joint ◽  
Temporal Bone ◽  
Qualitative And Quantitative ◽  
Lower Jaw ◽  
Individual Function ◽  
Mandibular Fossa ◽  
Quantitative Characteristics ◽  
Mandibular Movements ◽  
Qualitative And Quantitative Characteristics

The temporomandibular joint is paired, a complex formation of an ellipsoid shape, which is formed by the articular head of the lower jaw, the mandibular fossa and the articular tubercle of the temporal bone, covered with fibrous cartilage. There are two types of movements in the temporomandibular joint: translation and rotation, which implement protrusion-retrusion, right and left mediotrusion, and opening-closing. Computerized axiography is used for assessment of the mandibular movements and the patient’s skeletal parameters. This type of examination allows you to adjust the articulator for an individual function and to study the qualitative and quantitative characteristics of the temporomandibular joint.

Phytopharmacognostical and Chromatographic Evaluation of Leaves of Launaea procumbens

2021 ◽  
pp. 4291-4299
Author(s):  
Brijesh Charadva ◽  
Urvashi Ghataliya ◽  
Pooja Meena ◽  
Krishna Karia ◽  
Tixa Lakhlani ◽  
...  
Keyword(s):  
Solvent System ◽  
Acid Anhydride ◽  
Phase System ◽  
Phytochemical Screening ◽  
Calcium Oxalate Crystal ◽  
Quantitative Microscopy ◽  
Qualitative And Quantitative ◽  
Anomocytic Stomata ◽  
Chloroform Methanol ◽  
Launaea Procumbens

Launaea procumbens leaves are galactagogue, diuretic, antifungal, anorexic, anti-arthritic and hepatoprotective according to Ayurvedic texts as well as modern research. Launaea species, particularly L. pinnatifida, is mentioned as one of the sources of Gojihva, regarding which there is controversy with respect to its true botanical identity. However, no detailed anatomical, phytochemical or chromatographic investigation is available for leaf of L. procumbens which can differentiate it from L. pinnatifida. The aim of this work is to develop standardization parameters of L. procumbens leaves by performing its pharmacognostical evaluation, preliminary phytochemical screening, HPTLC and GC-MS fingerprints. Pharmacognostic investigation of the leaves was performed by its morphological study, qualitative and quantitative microscopy as well as powder microscopy. Extraction of leaves was done by maceration using methanol. This extract was used for preliminary phytochemical screening and chemoprofiling by GC-MS, as well as for developing its HPTLC fingerprint. A mobile phase system was developed by pilot TLC, following which an HPTLC fingerprint was performed using the solvent system chloroform: methanol: ethyl acetate (3:7:6). Diagnostic microscopic characters identified in powder include unicellular covering trichome, xylem vessels, anomocytic stomata, and prisms of calcium oxalate crystal. Phytochemical screening revealed the presence of phytoconstituents classes like phenolics, anthraquinones, saponin glycosides, carbohydrates, sterols, triterpenoids and flavonoids. HPTLC fingerprinting detected 6 peaks with Rf 0.25, 0.37, 0.41, 0.50, 0.65, 0.78 at 254nm and 4 peaks with Rf 0.32, 0.37, 0.50, 0.66 at 366nm. GC-MS fingerprint revealed presence of propanoic acid anhydride, valeric anhydride, 2- Pyrrolidine acetic acid, phthalan, 5- (Hydroxy methyl)-2-(dimethoxy methyl) furan, vanillin, methyl β-l-Arabino pyranoside, 1,6-anhydro-β-D-Gluco pyranose and 6-Methyl-2-Heptanone, 6-(3,5-dimethyl-2-furanyl). Present study will be very useful for herbal industry in differentiating Launaea procumbens from other species of the genus Launaea, particularly L. pinnatifida (Gojihva) as well as for authentication, standardization and detection of adulteration in the leaf formulations of Launaea procumbens.

Bone permittivity and its effect on using ground-penetrating radar

Geophysics ◽  
2018 ◽  
Vol 83 (1) ◽  
pp. H1-H11
Author(s):  
Blair B. Schneider ◽  
Georgios Tsoflias ◽  
Don W. Steeples ◽  
Rolfe Mandel ◽  
Jack Hofman
Keyword(s):  
Dielectric Properties ◽  
Dielectric Property ◽  
Ground Penetrating Radar ◽  
Relative Permittivity ◽  
Water Saturation ◽  
Mixing Models ◽  
Bone Properties ◽  
Animal Bone ◽  
Bone Minerals ◽  
Ground Penetrating

Ground-penetrating radar (GPR) is a powerful tool that is still being developed for archaeological investigations. We investigated the dielectric properties of mammoth bone and bone from modern bison, cow, deer, and elk as a proxy for applying GPR for detecting prehistoric animal remains. Sample dielectric properties (relative permittivity, loss factor, and loss-tangent values) were measured with an impedance analyzer over frequencies ranging from 10 MHz to 1 GHz. Bone-sample porosity, bulk density, water saturation, and volumetric water content of the specimens were also measured. The measured sample-relative permittivity values were then compared with modeled relative permittivity values using common dielectric-mixing models to determine which parameters control the best-fit predictions of relative permittivity of animal bone. We observe statistically significant dielectric-property differences among different animal fauna, as well as variation as a function of frequency. In addition, we determine that the relative permittivity values of 8–9 for similar minerals, such as apatite, are not suitable as a proxy for predicting animal bone properties. We estimate new relative permittivity values of 3–5 for dry animal bone minerals in the frequency range of 100–1000 MHz using these common dielectric-mixing models. We postulate that differences in bone microstructure contribute to dielectric-property variability.

Static dielectric constants of the N,N-dimethylformamide/2-methoxyethanol solvent system at various temperatures

1992 ◽  
Vol 70 (12) ◽  
pp. 2895-2899 ◽  
Author(s):  
Fulvio Corradini ◽  
Luigi Marcheselli ◽  
Lorenzo Tassi ◽  
Giuseppe Tosi
Keyword(s):  
Liquid State ◽  
Specific Interaction ◽  
Solvent System ◽  
Liquid Mixtures ◽  
Dielectric Constants ◽  
Empirical Equations ◽  
Binary Liquid ◽  
Fraction Mixture ◽  
Static Dielectric Constants ◽  
Formation Of Complexes

Measurements of static dielectric constants (ε) have been made for binary liquid mixtures of N,N-dimethylformamide (DMF)/2-methoxyethanol (ME) at 19 temperatures ranging from −10 to +80 °C. Some empirical equations of the type ε = ε(T), ε = ε(X1), and ε = ε(T,X1) have been applied to check their validity. The εE values, which refer to the deviation of the dielectric constants of the binaries from the values arising from mole fraction mixture law, have been calculated. Deviations from ideal behaviour have been found to be positive at all temperatures. The positive εE values are attributed to a specific interaction between unlike molecules, which leads to the formation of complexes between DMF and ME in the liquid state. These nDMF•mME complex moieties were found to have the stoichiometric ratios 2:1, 1:1, and 1:2 in the temperature range of −10 to +80 °C.

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