Characterization of Functions with Fourier Transforms Supported on Orthants

1993 ◽  
pp. 167-173
Author(s):  
J. N. Pandey ◽  
O. P. Singh
Keyword(s):  
Fourier Transforms

Research on the Microscopic Characterization of Preparing Alpha-Hemi Hydrate Gypsum from FGD Gypsum at Atmospheric Pressure

2011 ◽  
Vol 99-100 ◽  
pp. 944-947
Author(s):  
Yun Zhang ◽  
Xiao Fei Li ◽  
Wen Xuan Yin
Keyword(s):  
Atmospheric Pressure ◽  
Solution Method ◽  
Fourier Transforms ◽  
Heating Temperature ◽  
Aqueous Salt Solution ◽  
Fgd Gypsum ◽  
Stereo Microscope ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Hemi Hydrate

The condition of preparing α-hemi hydrate gypsum from FGD gypsum at atmospheric pressure is easy to achieve. It acquires atmospheric pressure and low heating temperature. This paper introduces two different methods of preparing α-hemi hydrate gypsum, aqueous salt solution method and dry dehydration. Use the microscopic characterization of α-hemi hydrate gypsum to identify the product. Observe the crystal of product by stereo microscope and characterize the compounds with Fourier transforms infrared spectroscopy. Investigate the factors’ effects between the two methods.

Preparation and Characterization of NiO Nanoparticles through Thermal Decomposition of Bis(glycinato)Nickel(II)dihydrate

2012 ◽  
Vol 601 ◽  
pp. 21-25
Author(s):  
Wei Yi Dan ◽  
Jian Fen Li ◽  
Xiang Chen Tu ◽  
Kui Le Jia
Keyword(s):  
Reaction Time ◽  
Fourier Transforms ◽  
Infrared Spectrometry ◽  
Nio Nanoparticles ◽  
X Ray Diffraction ◽  
Fine Crystal ◽  
Transmission Electron ◽  
Mean Size ◽  
Ft Ir

NiO nanoparticles were successfully prepared by decomposing the predecessor bis(glycinato)nickel(II)dihydrate in the presence of oleylamine and triphenylphosphine (TPP), and different approaches including Fourier transforms infrared spectrometry(FT-IR), X-ray diffraction(XRD) and transmission electron microscopy (TEM) were used to characterize the NiO nanoparticles. Meanwhile, the effects of TPP concentration and reaction time on the size and yield of NiO nanoparticles derived from precursors were thoroughly investigated in this paper. The analysis results indicated that the prepared NiO nanoparticles were found spherical in shape and demonstrated weak agglomeration. They had generally high purity and a fine crystal phase of cubic syngony. Furthermore, the effects of the TPP concentration and reaction time on the size and yield of NiO nanoparticles are very crucial, higher concentration of TPP would results in reduction of both the mean size and yield of NiO particles. However both yields and particles size of NiO nanoparticles continuously increased as increasing reaction time, after more than 60 minutes, the size and yield of NiO nanoparticles kept hardly change.

scholarly journals Green Synthesis and Characterization of Gold Nanoparticles using Ethanolic Turmeric Crude Extract At Neutral Ph

2020 ◽  
Vol 8 (6) ◽  
pp. 1535-1539
Keyword(s):  
Gold Nanoparticles ◽  
Crude Extract ◽  
Fourier Transforms ◽  
Cost Effective ◽  
Green Method ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Effective Synthesis ◽  
Average Size

There is a great interest in the development of green protocols to avoid environmental and health hazards. In this research, the eco-friendly and cost-effective synthesis of gold nanoparticles (GNPs) has been achieved by the green method using ethanolic turmeric crude extract at pH 7. The bioac-tive compounds of turmeric crude extract are responsible for the reduction, capping and sta-bility of the GNPs. The characterization of GNPs was carried out by ultraviolet-visible (UV-vis) spectroscopy, Fourier transforms infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy. The UV-vis spectral study indicated the formation of GNPs with a surface plasmon resonance (SPR) band at 547 nm. FTIR analysis of turmeric crude extract and GNPs showed that phenolic groups reduced the gold ions. The FESEM analysis showed the polydisperse morphology of GNPs with average size of 26.6 nm±7.4 nm. The elemental composition determined by EDX re-vealed the presence of gold. The synthesized GNPs can be useful in a variety of applications involving medicine, cosmetics, environment and nutraceutical.

scholarly journals Preparation and Characterization of Polymer Electrolyte of Glycidyl Methacrylate-Methyl Methacrylate-LiClO4Plasticized with Ethylene Carbonate

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
M. Imperiyka ◽  
A. Ahmad ◽  
S. A. Hanifah ◽  
M. Y. A. Rahman
Keyword(s):  
Polymer Electrolyte ◽  
Fourier Transforms ◽  
Ethylene Carbonate ◽  
X Ray Diffraction ◽  
Solar Cell Application ◽  
Casting Technique ◽  
Dye Sensitized ◽  
Amorphous Nature ◽  
Solution Casting Technique

In the present investigation, we study the properties of the plasticized polyglycidyl methacrylate P(GMA) copolymerized with polymethyl methacrylate P(MMA)-LiClO4polymer electrolyte prepared by solution casting technique. The electrolyte was characterized using impedance spectroscopy (EIS), Fourier transforms infrared (FTIR), cyclic voltammetry (CV), and X-ray diffraction (XRD). The conductivity was improved from1.3×10−12 S cm−1to8.7×10−6 S cm−1upon the addition of 25 wt.% LiClO4salt into P(GMA-MMA). The conductivity was improved from1.4×10−6 S cm−1to3.0×10−4 S cm−1upon the addition of 80 wt.% EC into P(GMA-MMA)-LiClO4The band that belongs to C–O–C is shifted farther than the band of C=O upon the addition of LiClO4into P(GMA-MMA). The band of C–O–C stretching is shifted to lower wavenumber upon the addition of EC into P(GMA-MMA)-LiClO4. Upon the addition of EC into P(GMA-co-MMA), the intensity of the peaks decreases, implying the amorphous nature of the electrolyte increases with the concentration of the plasticizer. The electrolyte is electrochemically stable at 3.8 V, making it suitable for dye-sensitized solar cell application.

Preparation and Characterization of Chitosan from Perna viridis (Linnaeus, 1758) shell waste as raw material

2021 ◽  
pp. 2757-2762
Author(s):  
Thilagar Gobinath ◽  
Sasikumar Thamizhselvan ◽  
Arumugam Ramakrishnan ◽  
Samuthirapandian Ravichandran
Keyword(s):  
Fourier Transforms ◽  
Xrd Analysis ◽  
Raw Material ◽  
Perna Viridis ◽  
X Ray Diffraction ◽  
Alternative Source ◽  
Water Binding ◽  
Physiochemical Properties ◽  
Plasma Recalcification Time

Chitosan is extracted from Perna viridis as the staring source via the cycle of chitin deacetylation, which is conducted at 90°C for 6 hours using 40% NaOH. Physiochemical properties such as yield (18%), ash content (0.626%), moisture content (2.9%), and solubility, degree of deacetylation (55), fat binding capability (209%) and water binding ability (254 %) revealed that P.viridis is an important alternative source of chitosan. Fourier transforms infrared spectroscopy (FTIR) analysis showed the characteristic peaks of OH at 3400cm-1 and amine at 1660cm-1, the X-ray diffraction (XRD) analysis suggested two critical characteristic peaks at 18° and 34° at (2θ). Scanning electron microscope (SEM) was used to evaluate the surface morphology of isolated chitosan. Thermogravimetric analysis (TG/DTA) was also used to describe the thermal stability of P.viridis chitosan. The procoagulant capacity, plasma recalcification time assays and minimal bactericidal activity verified the hemocompatibility and antibacterial activity of the preparation of chitosan.

Projected Measures: A Simple Way to Characterize Fractal Structures and Interfaces

Fractals ◽  
1997 ◽  
Vol 05 (02) ◽  
pp. 295-308
Author(s):  
Massimiliano Giona ◽  
Manuela Giustiniani ◽  
Oreste Patierno
Keyword(s):  
Closed Form ◽  
Fourier Transforms ◽  
Fractal Structures ◽  
Multifractal Spectra ◽  
Self Similar ◽  
The Moment ◽  
Dynamic Phenomena

The properties of projected measures of fractal objects are investigated in detail. In general, projected measures display multifractal features which play a role in the evolution of dynamic phenomena on/through fractal structures. Closed-form results are obtained for the moment hierarchy of model fractal interfaces. The distinction between self-similar and self-affine interfaces is discussed by considering the properties of multifractal spectra, the orientational effects in the behavior of the moment hierarchies, and the scaling of the corresponding Fourier transforms. The implications of the properties of projected measures in the characterization of transfer phenomena across fractal interfaces are briefly analyzed.

A Contrasting Bipolar Jungian Method of Modeling Military Character and Nonmilitary Character

1984 ◽  
Vol 54 (1) ◽  
pp. 331-334
Author(s):  
Marshall Mak
Keyword(s):  
Fourier Transforms ◽  
Directed Search ◽  
Personality Psychology ◽  
Rotc Cadets ◽  
Military Unit ◽  
Reserve Officer Training Corps ◽  
Physics Model ◽  
Service Academy ◽  
The Military

A forced-choice, bipolar, Jungian inventory of representative items inspired by the Dictionary of Occupational Titles, the Strong-Campbell Interest Inventory and the Self-directed Search was administered to a military sample of 73 U. S. Air Force (USAF) and U. S. Army (USA) Reserve Officer Training Corps (ROTC) cadets and a nonmilitary sample of 74 civilian graduate students. Fourier transforms of the general trigonometric polynomial depicted from the graphed point plots of the statistically significant data indicated (a) a “direct-current” characterization of the military sample and (b) an “alternating-current” characterization of the nonmilitary sample. Equivalent system models were extrapolated from behavioral and clinical psychology, i.e., “paranoid” and “schizoid,” and personality psychology, i.e., “authoritarian” and “egalitarian.” The resulting characterizations from the physics model were pragmatically discussed as possible predictors of (a) identifying probable successful U. S. Service Academy enrollees, (b) profiling effective military recruiters, and (c) maximizing the potential combat effectiveness of the military unit.

scholarly journals Review: Synthesis, Characterization and Studies on Controlled Release Properties of Layered Compound

2021 ◽  
Vol 14 ◽  
pp. 1-17
Author(s):  
Sheikh ahmad izaddin Sheikh mohd ghazali
Keyword(s):  
Controlled Release ◽  
Fourier Transforms ◽  
Layered Compounds ◽  
Layered Compound ◽  
Water Treatment Process ◽  
Antimicrobial Studies ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Inorganic Structure

Layered inorganic structure such as Layered Double Hydroxide (LDH), zinc layered hydroxide (ZLH) and graphene, in nano-size, have been used widely in the nanotechnology areas as a new and promising problem solving materials. The ability of these inorganic layered compounds that able to encapsulate the organic anions were known to provide greatest benefits; were explained more details in this paper. Intercalations of anion into the interlayer spaces of layered inorganic structure such as anion-exchange, co-precipitation, hydrothermal method and reconstruction with ‘memory effect’ were also explained. The characterization of intercalated layered nanocomposites such as Fourier Transforms Infrared (FTIR) spectroscopy, PowderX-ray Diffraction (PXRD) analysis, Thermogravimetric analysis, surface analysis was used to explain the successful of anion intercalated in between the interlayer spaces of layered inorganic structures. The application of these hybrids that have been widely used such as controlled release properties in pharmaceutical area, antimicrobial studies, dyeing agent, enhancing UV Sunscreen protection, herbicides and water treatment process were also described in details.

scholarly journals Application of Direct Methods to Inorganic Materials Characterization

2014 ◽  
Vol 70 (a1) ◽  
pp. C29-C29
Author(s):  
Jordi Rius
Keyword(s):  
Fourier Transforms ◽  
Direct Methods ◽  
Inorganic Materials ◽  
Data Sets ◽  
Variable Degree ◽  
Patterson Function ◽  
Small Crystals ◽  
Structure Solution ◽  
Using Data

Although in the last years most attention has been paid to the development of direct methods (DM) in the macromolecular field, DM also play an important role in the characterization of inorganic materials. Very challenging is nowadays the structure solution of increasingly small crystals. Here the difficulty is not associated with the large number of atoms but with experimental limitations which may affect the data accuracy and the completeness of the data sets. It is obvious that DM have to adapt to this emerging scientific need. Particularly interesting has been the evolution of Patterson-function DM to cope with these objectives. The initial formulation based on the explicit use of triple-phase sums was modified to permit the calculation with Fourier transforms thus resulting in the more simple and accurate S-FFT algorithm [1]. Thanks to the resulting increased simplicity, this algorithm could be easily adapted to the treatment of powder diffraction data of complex inorganic materials [2]. The practical application of this algorithm is analyzed by using data of some synthetic and natural materials. Recently, the possibility of collecting good quality 3D intensity data from very small nanovolumes by new sophisticated electron diffraction (ED) techniques has become a reality. However, these data sets are often incomplete and, in addition, the intensities are not completely kinematical. The processing of these data sets represents a new challenge for DM. To this purpose a new (even more simple) Patterson-function DM (called delta-recycling) has been developed and tested on precession ED data from inorganic materials with variable degree of difficulty [3]. Phasing with delta-recycling proves to be highly efficient and from the interpretation of the results important practical conclusions can be drawn.

scholarly journals One Pot Synthesis and Characterization of Palladium [Pd(Anil-Tolu)4(H2O)2]by insitu Method

2019 ◽  
Vol 9 (2S4) ◽  
pp. 273-276
Keyword(s):  
Metal Complex ◽  
Fourier Transforms ◽  
Molar Ratio ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
One Pot ◽  
Prepared Material ◽  
Palladium Nitrate ◽  
Fourier Transforms Infrared Spectroscopy

The insitu synthesis of Schiff base metal complex using p-toluedine (p-tolu), p-anisaldehyde (p-anisal) as starting materials with Palladium nitrate hexahydrate (Pd(NO3)2.6H2O) as a metal precursor in the molar ratio (1:1:1 M) at room temperature. The prepared metal complex is washed with several times with ethanol and boiled water for the removal of un-reacted materials completely. To confirm the prepared material by the following characterization like UV-visible spectroscopy, Fourier Transforms Infrared spectroscopy, X-ray diffraction pattern and Cyclic Voltammetry.

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