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Journal articles on the topic 'Dispersion ratio'

Author: Grafiati

Published: 4 June 2025

Last updated: 14 July 2025

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1

Thonglerth, P., P. Sujaridworakun, and O. Boondamnoen. "Preparation of ZnO Nanoparticles Water-based Dispersion." Journal of Physics: Conference Series 2175, no. 1 (2022): 012029. http://dx.doi.org/10.1088/1742-6596/2175/1/012029.

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Abstract In this work, an attempt was made to stabilize ZnO NPs as water-based dispersion. The dispersing agents used are 3-glycidoxypropyltrimethoxysilane (GPTMS), polyvinyl alcohol (PVA) and oleic acid (OA). These dispersing agents were combined with sodium dodecyl sulfate (SDS) to facilitate better dispersion stability. Different wt% content of modified ZnO NPs such as 0.2, 0.4, 1 and 3% w/v was used at a fixed ratio of ZnO NPs:SDS:dispersing agent. The highest dispersion stability was achieved at 1% w/v content of modified ZnO NP, whereas some precipitate was observed at 3% w/v. The result

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Jiu, Yong Bin, Xin Miao Zeng, Jun Hui Ji, Yu Zhai, and Lian Cai Wang. "Properties of Waterborne Polyurethanes: Effect of NCO/OH Ratio." Advanced Materials Research 284-286 (July 2011): 624–27. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.624.

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Waterborne polyurethanes(WPUs) based on isophorone diisocyanate(IPDI), Polybutylene adipate (PBA) and dimethylolproprionic acid(DMPA) were synthesized by prepolymer mixing process. Effect of NCO/OH ratio on the properties of the dispersions was studied. The structure of the WPUs was studied by FT-IR. Besides the mechanical properties and water swelling of the films, the number average diameters of the dispersions and the viscosity of WPUs were characterized, results showed that all WPUs had higher solid content (over 45%). With higher NCO/OH ratio, WPUs had bigger dispersion size and lower dis

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3

Fitriani, Lili, Sherly Ramadhani, and Erizal Zaini. "PREPARATION AND CHARACTERIZATION OF SOLID DISPERSION FAMOTIDINE – MANNITOL BY CO-GRINDING METHOD." Asian Journal of Pharmaceutical and Clinical Research 10, no. 3 (2017): 249. http://dx.doi.org/10.22159/ajpcr.2017.v10i3.16112.

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ABSTRACTObjective: This study aims to prepare and characterize solid dispersion of famotidine using mannitol to enhance the solubility and dissolution rate.Methods: Solid dispersions were prepared by co-grinding method in 9 formulas. The ratio of famotidine and mannitol was varied (1:1, 1:2, 2:1 w/w),and each ratio was milled at three different times (30, 60, and 90 minutes). The physical mixture was also prepared as comparison at ratio 1:1 w/w.Solid dispersions were characterized by X-ray diffraction analysis, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry(D

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An, Seok Hwan, Ki Yun Kim, and Jea Uk Lee. "Reinforcement of Cement Nanocomposites through Optimization of Mixing Ratio between Carbon Nanotube and Polymer Dispersing Agent." Polymers 16, no. 3 (2024): 428. http://dx.doi.org/10.3390/polym16030428.

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Carbon nanotubes (CNTs), known for their exceptional mechanical, thermal, and electrical properties, are being explored as cement nanofillers in the construction field. However, due to the limited water dispersion of CNTs, polymer dispersing agents like polycarboxylate ether (PCE) and sulfonated naphthalene formaldehyde (SNF) are essential for uniform dispersion. In a previous study, PCE and SNF, common cement superplasticizers, effectively dispersed CNTs in cement nanocomposites. However, uncertainties remained regarding the extent to which all dispersing agents interacted efficiently with CN

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Ivanov, D. V., V. A. Ivanov, N. V. Ryabova, and A. A. Kislitsyn. "Implementation of the Maximum Bandwidth Ratio of Satellite Radio Communication Systems under the Conditions for Intramodal Dispersion of Transionospheric Radio Channels." Радиотехника и электроника 68, no. 6 (2023): 571–78. http://dx.doi.org/10.31857/s0033849423060049.

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The problem of significant extension of the band of the transionospheric radio channel to the maximum possible values is solved to improve the efficiency of satellite communication systems. Hardware and software are created to suppress the group delay dispersion using methods of data mining for experimental diagnostics of a transionospheric communication line. Algorithms and tools for intelligent sensory diagnostics of wideband radio channels with adaptation to dispersion variability are developed. In the absence of adaptation, it is possible to create radio channels of undistorted transmissio

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Mavko, Gary, and Diane Jizba. "The relation between seismic P‐ and S‐wave velocity dispersion in saturated rocks." GEOPHYSICS 59, no. 1 (1994): 87–92. http://dx.doi.org/10.1190/1.1443537.

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Seismic velocity dispersionin fluid-saturated rocks appears to be dominated by tow mecahnisms: the large scale mechanism modeled by Biot, and the local flow or squirt mecahnism. The tow mechanisms can be distuinguished by the ratio of P-to S-wave dispersions, or more conbeniently, by the ratio of dynamic bulk to shear compliance dispersions derived from the wave velocities. Our formulation suggests that when local flow denominates, the dispersion of the shear compliance will be approximately 4/15 the dispersion of the compressibility. When the Biot mechanism dominates, the constant of proporti

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Bhide, Prashant, and Reeshwa Nachinolkar. "FORMULATION DEVELOPMENT AND CHARACTERISATION OF MECLIZINE HYDROCHLORIDE FAST DISSOLVING TABLETS USING SOLID DISPERSION TECHNIQUE." International Journal of Applied Pharmaceutics 10, no. 4 (2018): 141. http://dx.doi.org/10.22159/ijap.2018v10i4.26493.

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Objective: The aim of the present investigation was to design and evaluate fast dissolving tablet (FDT) for the oral delivery containing solid dispersion of meclizine (MCZ) hydrochloride, an antiemetic drug.Methods: The solubility of meclizine was increased by preparing solid dispersions using mannitol as a carrier by fusion method. The prepared solid dispersion, was subjected for in vitro drug release, percent practical yield, drug content, infrared spectroscopy (IR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM). Optimized solid dispersion was incorporated to pr

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8

Kojima, Keiko, Nodoka Kosugi, Hirokuni Jintoku, Kazufumi Kobashi, and Toshiya Okazaki. "Preparing a liquid crystalline dispersion of carbon nanotubes with high aspect ratio." Beilstein Journal of Organic Chemistry 20 (January 11, 2024): 52–58. http://dx.doi.org/10.3762/bjoc.20.7.

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We successfully prepared a surfactant-assisted carbon nanotube (CNT) liquid crystal (LC) dispersion with double-walled CNTs (DWCNTs) having a high aspect ratio (≈1378). Compared to dispersions of single-walled CNTs (SWCNTs) with lower aspect ratio, the transition concentrations from isotropic phase to biphasic state, and from biphasic state to nematic phase are lowered, which is consistent with the predictions of the Onsager theory. An aligned DWCNT film was prepared from the DWCNT dispersion by a simple bar-coating method. Regardless of the higher aspect ratio, the order parameter obtained fr

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Kunčická, L., and J. Svoboda. "Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging." Materialwissenschaft und Werkstofftechnik 55, no. 5 (2024): 588–97. http://dx.doi.org/10.1002/mawe.202400023.

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AbstractSteels strengthened by alloying elements and precipitates typically maintain their enhanced properties up to the ferrite‐austenite transformation. However, oxide dispersion strengthened ferritic steels are creep resistant even at much higher temperatures given by dispersions of nanosized oxides. To ensure homogeneous dispersion of the oxides, powder metallurgy is used for preparation of the original material. The presented study investigates the effects of direct consolidation of powder of ferritic steel strengthened with yttrium oxide nanoparticles. The powders were mechanically alloy

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10

Al Masum, Md Abdullah, Florida Sharmin, S. M. Ashraful Islam, and Md Selim Reza. "Enhancement of Solubility and Dissolution Characteristics of Ibuprofen by Solid Dispersion Technique." Dhaka University Journal of Pharmaceutical Sciences 11, no. 1 (2012): 1–6. http://dx.doi.org/10.3329/dujps.v11i1.12480.

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In this study solid dispersions (SDs) of ibuprofen were prepared by melt dispersion technique using macrogol 4000 and macrogol 6000 as carrier. Physical mixtures (PMs) of ibuprofen were also prepared with the same carrier and in the same drug-carrier ratio (1:0.5, 1:1 and 1:1.5) to compare the dissolution profile. The solid dispersions and physical mixtures were investigated for drug loading, saturation solubility and dissolution behavior. Saturation solubility study was carried out in phosphate buffer (pH 7.2), 0.1 N HCl solution and distilled water. Solid dispersions were found effective to

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11

Dimas, Ari Setyawan. "IMPLEMENTASI FUNGSI DISPERSION RATIO PADA PROSES SPLITING ATRIBUT ALGORITMA DECISION TREE." MADANI: Jurnal Ilmiah Multidisiplin 1, no. 2 (2023): 86–91. https://doi.org/10.5281/zenodo.7782439.

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Metode klasifikasi yang memiliki proses seleksi fitur adalah algoritma decision tree. Proses seleksi fitur pada algortima decision tree biasanya menggunakan fungsi Information Gain. Information gain  pada algoritma decision tree memiliki kelemahan jika ada dataset yang memiliki atribut key seperti Product-ID. Fungsi dispersion ratio pada algoritma decision tree dapat meningkatkan signifikansi proses seleksi fitur, sehingga dapat mengatasi kekurangan fungsi information gain. Proses splitting atribut pada decision tree menggunakan fungsi dispersion ratio dengan menggunakan dataset yang diam

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12

Huang, Bin Bin, Dong Xu Liu, De Kun Liu, and Gang Wu. "Application of Solid Dispersion Technique to Improve Solubility and Sustain Release of Emamectin Benzoate." Molecules 24, no. 23 (2019): 4315. http://dx.doi.org/10.3390/molecules24234315.

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The solid dispersion technique, which is widely used in the medical field, was applied to prepare a pesticide dosage form of emamectin benzoate (EM). The preparation, physicochemical characterization, aqueous solubility, release dynamics, photolytic degradation, bioactivity, and sustained-release effects of the prepared EM solid dispersions were studied by a solvent method, using polymer materials as the carriers. Water-soluble polyvinyl pyrrolidone (PVP) K30 and water-insoluble polyacrylic resin (PR)III were used as the carriers. The influence of various parameters, such as different EM:PVP-K

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13

Pathak, Deepa, Sunita Dahiya, and Kamla Pathak. "Solid dispersion of meloxicam: Factorially designed dosage form for geriatric population." Acta Pharmaceutica 58, no. 1 (2008): 99–110. http://dx.doi.org/10.2478/v10007-007-0048-y.

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Solid dispersion of meloxicam: Factorially designed dosage form for geriatric populationThe objective of the present work was to improve the dissolution properties of the poorly water-soluble drug meloxicam by preparing solid dispersions with hydroxyethyl cellulose (HEC), mannitol and polyethylene glycol (PEG) 4000 and to develop a dosage form for geriatric population. Differential scanning calorimetry, X-ray diffractometry, Fourier transform infrared spectroscopy and scanning electron microscopy were used to investigate the solid-state physical structure of the prepared solid dispersions. Hig

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Noval, Noval, and Rosyifa Rosyifa. "SOLID DISPERSION FOR INCREASING DISSOLUTION RATE OF SODIUM DICLOFENAC WITH VARIATIONS OF POLYVINYL PYRROLIDONE K30." Journal of Pharmaceutical Care Anwar Medika 3, no. 2 (2021): 86–98. http://dx.doi.org/10.36932/jpcam.v3i2.46.

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Diclofenac sodium is included in class II category based on biopharmaceutics classification system (BCS), sodium diclofenac has low solubility and high permeability. Low solubility will affect absorption of drugs in body because rate of dissolution will decrease. PVP K30 is inert carrier that dissolves easily in water and can affect solubility of an active drug substance. To know solid dispersion system increasing dissolution rate of sodium diclofenac by adding variations concentration of PVP K30. Solid dispersion uses solvent method with variations concentration of PVP K30 1:3, 1:5, 1:7 and 1

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15

Cordeiro, Gauss M., Gilberto A. Paula, and Denise A. Botter. "Improved Likelihood Ratio Tests for Dispersion Models." International Statistical Review / Revue Internationale de Statistique 62, no. 2 (1994): 257. http://dx.doi.org/10.2307/1403512.

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16

Kuo, Yung-Chih, and Jyh-Ping Hsu. "Dynamic stability ratio of a colloidal dispersion." Chemical Physics 250, no. 3 (1999): 285–94. http://dx.doi.org/10.1016/s0301-0104(99)00327-4.

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17

Mankar, S. D., and Arpita Tupe. "Solubility enhancement and evaluation of Cilnidipine using solid Dispersion techniques." International Journal of Experimental Research and Review 32 (August 30, 2023): 347–57. http://dx.doi.org/10.52756/ijerr.2023.v32.030.

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The poor solubility of Cilnidipine leads to low bioavailability and limits its therapeutic efficacy. To develop a dosage form that is stable, effective and has a higher bioavailability. It is necessary to increase the solubility of such medications. The present study aimed to improve the solubility by solid dispersion technique of Cilnidipine by solid dispersion techniques. Solvent evaporation and melt fusion methods were used to prepare solid dispersions of the drug cilnidipine with various polymers. The solubility of these prepared solid dispersions was evaluated by FT-IR spectroscopy, Diffe

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18

Ibrahim, Berivan, and Nozad Hussein. "Optimization of solid dispersion technique and gliclazide to carrier (PVP K30) ratio for solubility enhancement." Zanco Journal of Medical Sciences 28, no. 2 (2024): 192–206. http://dx.doi.org/10.15218/zjms.2024.20.

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Background and objective: Poorly water-soluble dugs provide less dissolution rate and bioavailability; hence, it minimizes the pharmacological effect of orally administered medications. Gliclazide is a sulfonylurea antidiabetic medication of the second generation, used to treat type II diabetes mellitus. It belongs to the class II drugs of biopharmaceutic classification system, indicating that it has high permeability and poor aqueous solubility. The aim of this study is to determine an optimum solid dispersion method and drug to carrier ratio to improve the solubility of gliclazide. Methods:

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19

Yang, Shu-Cheng, Wen-Biao Han, Shuo Xin, and Chen Zhang. "Testing dispersion of gravitational waves from eccentric extreme-mass-ratio inspirals." International Journal of Modern Physics D 28, no. 15 (2019): 1950166. http://dx.doi.org/10.1142/s0218271819501669.

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In general relativity, there is no dispersion in gravitational waves, while some modified gravity theories predict dispersion phenomena in the propagation of gravitational waves. In this paper, we demonstrate that this dispersion will induce an observable deviation of waveforms if the orbits have large eccentricities. The mechanism is that the waveform modes with different frequencies will be emitted at the same time due to the existence of eccentricity. During the propagation, because of the dispersion, the arrival time of different modes will be different, then produce the deviation and deph

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Lee, Jeong Gyun, Su Min Lee, Seo Wan Yun, and Kyeong Soo Kim. "Development of Enzalutamide Solid Dispersion Loaded Tablet with Enhanced Solubility." Yakhak Hoeji 66, no. 5 (2022): 283–91. http://dx.doi.org/10.17480/psk.2022.66.5.283.

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The objective of this study was to develop a novel enzalutamide tablet formulation with enhanced solubility and bioavailability, and inhibited recrystallization. Kollidon VA64 was selected as a soluble polymer for preparing enzalutamide solid dispersions. Solid dispersions with different enzalutamide to Kollidon VA64 weight ratios were prepared via solvent evaporation method. The enzalutamide solid dispersion consisting of enzalutamide and Kollidon VA64 at a weight ratio of 1:1, exhibited an excellent dissolution rate and potent inhibition of recrystallization. Enzalutamide solid dispersions w

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Sun, Ren Juan, Shan Shan Wei, Zhi Qin Zhao, Da Wei Huang, and Zhi Ge. "Dispersion of Mutiwall Carbon Nanotubes." Applied Mechanics and Materials 357-360 (August 2013): 986–89. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.986.

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This paper studied the ratio of dispersion of multiwall carbon nanotubes (MWNTs) in different surfactant solutions. Effects of surfactant type and concentration and MWNTs to surfactant ratio were investigated. Test results indicate that sodium dodecyl sulfate (SDS) and TNWDIS were better surfactants. Samples with SDS to MWNTs ratio of 6 or TNWDIS to MWNTs ratio of 0.6 had higher ratio of dispersion.

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Frømyr, Tomas Roll, Finn Knut Hansen, and Torbjørn Olsen. "The Optimum Dispersion of Carbon Nanotubes for Epoxy Nanocomposites: Evolution of the Particle Size Distribution by Ultrasonic Treatment." Journal of Nanotechnology 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/545930.

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The ultrasonic dispersion of multiwalled carbon nanotube (MWCNT) suspensions was assessed by studying the differential sedimentation of the particles in an acid anhydride often employed as a curing agent for epoxy resins. The particle size distributions were characterized by the means of a disc centrifuge, and the effect of dispersion time, power density, and total energy input, for both bath and circulation probe ultrasonic dispersing equipment was investigated. The mass of freely suspended MWCNTs relative to agglomerated MWCNTs was estimated as a measure of the quality of the dispersions, an

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Noval, Noval, and Rosyifa Rosyifa. "Dispersi Padat untuk Peningkatan Laju Disolusi Natrium Diklofenak dengan Variasi Konsentrasi Polivinil Pirolidon K30." Jurnal Surya Medika 6, no. 2 (2021): 94–101. http://dx.doi.org/10.33084/jsm.v6i2.2125.

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Diclofenac sodium is included in the class II category based on the biopharmaceutics classification system (BCS), sodium diclofenac has low solubility and high permeability. Low solubility will affect the absorption of drugs in the body because the rate of dissolution will decrease. Polyvinyl Pyrrolidone (PVP) K30 is an inert carrier that dissolves easily in water and can affect the solubility of an active drug substance. To know solid dispersion system increasing dissolution rate of sodium diclofenac by adding variations concentration of PVP K30. Solid dispersion uses a solvent method with va

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Okonogi, Siriporn, Adchareeya Kaewpinta, Sakornrat Khongkhunthian, and Pisaisit Chaijareenont. "Development of Controlled-Release Carbamide Peroxide Loaded Nanoemulgel for Tooth Bleaching: In Vitro and Ex Vivo Studies." Pharmaceuticals 14, no. 2 (2021): 132. http://dx.doi.org/10.3390/ph14020132.

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Burst release of carbamide peroxide (CP) from traditional hydrogels causes severe inflammation to periodontal tissues. The present study explores the development of a novel CP nanoemulgel (CP-NG), an oil-in-water nanoemulsion-based gel in which CP was loaded with a view to controlling CP release. CP solid dispersions were prepared, using white soft paraffin or polyvinylpyrrolidone-white soft paraffin mixture as a carrier, prior to formulating nanoemulsions. It was found that carrier type and the ratio of CP to carrier affected drug crystallinity. Nanoemulsions formulated from the optimized CP

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Kovalevska, Inna, Olena Ruban, Olga Kutova, and Julia Levachkova. "Optimization of the composition of solid dispersion of quercetin." Current Issues in Pharmacy and Medical Sciences 34, no. 1 (2021): 1–4. http://dx.doi.org/10.2478/cipms-2021-0001.

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Abstract Increasing the solubility of drugs is one of the most important problems in pharmacy, because most manufactured pharmaceutical substances are sparingly soluble. Typically, such compounds represent Classes II and IV in the biopharmaceutical classification system, which is based on the classification of pharmaceutical substances by solubility and permeability. For poorly soluble substances, the limiting step of the absorption process is usually the degree and dissolution rate, so in the pharmaceutical development, much attention is paid to their improvement. To solve this problem, the t

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Wei, Xiao Li, and Fa Xing Zhang. "Study on Polyurethane Dispersions with PES/PPG and High-Solid Content." Advanced Materials Research 864-867 (December 2013): 588–91. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.588.

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A series of novel stable and high-solid-content polyurethane were prepared by self-emulsification,use PES and PPG as mixed soft segments.Influence of APAETMS content and mole ratio of PES/PPG on properties of polyurethane dispersions and films were analyzed .Results show that: the cross-linked complex were multivariate distribution in particle size. With an increase of the mass ratio of PES and PPG and content of APAETMS average particles diameter of polyurethane dispersions became bigger , poly-dispersion became wider., solid content of dispersions decrease.. It is also noticed that the high-

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Hu, Zhi Jun. "Research on Surface Treatment of Carbon Fiber and the Conductive Properties of Paper." Advanced Materials Research 424-425 (January 2012): 1007–10. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.1007.

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The influences of the oxidative modification, coupling treatment and dispersing agent for carbon fiber dispersion and binding properties were investigated, and the relationships of different ratio of carbon fiber with the physical strength and electrical conductivity of the paper were analyzed. Meanwhile fiber surface morphology, zeta potential and absorbance slurry were tested. The result showed that: coupling modification significantly improved the dispersion performance of carbon fiber, superior than oxidative modification, the increase of the dispersion would enhance the conductivity of ca

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Zhang, Jizhi, and Xiankai Jiang. "Synthesis and characterization of alicyclic two-component waterborne polyurethane." Pigment & Resin Technology 47, no. 4 (2018): 315–22. http://dx.doi.org/10.1108/prt-07-2017-0064.

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Purpose The purpose of this paper is to synthesize and characterize a series of alicyclic two-component waterborne polyurethane (2K-WPU) which is composed of non-ionic polyisocyanate aqueous dispersion and hydroxyl aqueous dispersion. Design/methodology/approach The appearances of aqueous dispersions and 2K-WPU films were observed by photographs. The micromorphology of alicyclic polyisocyanate aqueous dispersion was examined by scanning electron microscopy (SEM). The molecule structures of WPU were studied by Fourier transform infrared (FTIR). The effect of NCO:OH molar ratio of two components

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Tang, Sha, Xiaoyang Han, and Yansheng Zhi. "Numerical Simulation of Pollutant Channeling between Adjacent Road Tunnels." E3S Web of Conferences 536 (2024): 03013. http://dx.doi.org/10.1051/e3sconf/202453603013.

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With the development of highway tunnels, the increasing number of continuous tunnels has brought forth a growing concern regarding the dispersion of pollutants between tunnel entrances. This study employs numerical simulations with Star CCM+ to analyze factors influencing pollutant dispersion between continuous tunnel entrances, such as inlet and outlet velocities, longitudinal spacing, and lateral wind. Results indicate that maintaining a constant longitudinal size ratio while increasing velocity ratio augments intrusion ratio. Altering longitudinal spacing and equivalent diameter does not af

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Dabhade, Dhiraj, Kamlesh Wadher, Shrikant Bute, Nikita Naidu, Milind Umekar, and Sanjay Anantwar. "Preparation and Characterization of Artemether Solid Dispersion by Spray Drying Technique." Journal of Drug Delivery and Therapeutics 11, no. 2 (2021): 1–5. http://dx.doi.org/10.22270/jddt.v11i2.4557.

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Introduction: Artemether, a BCS class IV drug (poorly water soluble and poorly permeable, less bioavailability) but is found to be effective against falciparum malaria. Preparation of water soluble formulation could be the technique to improve bioavailability of such drug. The most ideally used technique to enhance the solubility and dissolution of poorly water soluble drugs is Solid dispersion method. Method: The objective of the study was to enhance the solubility and dissolution rate of Artemether by preparing solid dispersions using Soluplus, at different ration of 1:1, 1:2, 1:3 and

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N. Deshpande, Mangirish, Shruti S. Dessai, and Pearl Dighe. "SOLID DISPERSION SYSTEMS OF POORLY WATER SOLUBLE DRUG FEBUXOSTAT: PREPARATION, CHARACTERIZATION AND OPTIMIZATION." INDIAN DRUGS 60, no. 10 (2023): 40–47. http://dx.doi.org/10.53879/id.60.10.13648.

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Febuxostat is a poor soluble drug used in the management of hyperuricemia and gout. The present study aims at increasing the solubility of febuxostat by solid dispersion technique with the aid of various polymers (Beta cyclodextrin, Soluplus®, HPMC E5, and Kolliphor® P 407) in various drug: carrier ratios employing the solvent evaporation method. Solid dispersions were evaluated for physical appearance, percentage yield, drug content, saturation solubility and dissolution properties. Saturation solubility data of the study depict an increased solubility of the solid dispersion compared to the

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Filip, Ferdinánd, Ladislav Mišík, and János T. Tóth. "Dispersion of ratio block sequences and asymptotic density." Acta Arithmetica 131, no. 2 (2008): 183–91. http://dx.doi.org/10.4064/aa131-2-5.

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GUELL, D. C., R. G. COX, and H. BRENNER. "TAYLOR DISPERSION IN CONDUITS OF LARGE ASPECT RATIO†." Chemical Engineering Communications 58, no. 1-6 (1987): 231–44. http://dx.doi.org/10.1080/00986448708911970.

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Appelhans, Anthony D., James E. Delmore, and John E. Olson. "Wide dispersion multiple collector isotope ratio mass spectrometer." International Journal of Mass Spectrometry 241, no. 1 (2005): 1–9. http://dx.doi.org/10.1016/j.ijms.2004.10.020.

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Roy, Smita, Samrat Mondal, Asif Ekbal, and Maunendra Sankar Desarkar. "Dispersion Ratio based Decision Tree Model for Classification." Expert Systems with Applications 116 (February 2019): 1–9. http://dx.doi.org/10.1016/j.eswa.2018.08.039.

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Ali, Wedad Kamal, Methaq Hamad Sabar, Athmar Dhahir Habeeb, and Zainb Hassan Mahdi. "Enhancing Dissolution of Ibuprofen via Solid Dispersion Using Hydrophilic Carrier and Fast Dissolving Sugars." Al Mustansiriyah Journal of Pharmaceutical Sciences 14, no. 1 (2014): 52–61. http://dx.doi.org/10.32947/ajps.v14i1.127.

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In this study, solid dispersion using hydrophilic carriers (polyethylene glycols) and fast dissolving sugars (sorbitol and lactose) has been employed to enhance dissolution and hence the bioavailability of ibuprofen.Solid dispersions of different weight ratios (drug: carrier: fast dissolving sugars) have been prepared using fusion method.Microscopic images showed disappearance of specific features of ibuprofen, carriers and sugars in the solid dispersions.Release study of ibuprofen from prepared systems was performed in phosphate buffer pH 6.8; faster drug release was obtained from solid dispe

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Jeet, Kamal, Kapil Kumar, Aparna Joshi, Ikram Ikram, and Vaishali Rajput. "Development and Evaluation of Solid Dispersion Formulations of Olanzepine." Journal of Drug Delivery and Therapeutics 13, no. 10 (2023): 109–16. http://dx.doi.org/10.22270/jddt.v13i10.5985.

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The purpose of present study was to enhance the aqueous solubility of olanzapine by using the Solid dispersion technique. Solid dispersions of olanzapine were prepared by the dispersion method using PGS and SSG as carriers. Drug-carrier ratios such as 1 : 1, 1 : 2, 1 : 4, 1 : 6, 1: 8 and 1 : 10 were tried for optimization. Characterization was done by phase solubility, in-vitro release, saturation solubility, permeation, wettability, XRD and FTIR analysis. Solid dispersions showed higher solubility and an improved drug release profile than the pure drug. Solid dispersion and physical mixture w

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S, Okonogi, Sirithunyalung J, Sirithunyalig B, Wolschann P, and Viernstein H. "EFFECT OF CARRIER TYPES ON THE PHYSICOCHEMICAL AND DISSOLUTION CHARACTERISTICS OF OFLOXACIN SOLID DISPERSION." Scientia Pharmaceutica 70, no. 3 (2002): 309–16. http://dx.doi.org/10.3797/scipharm.aut-02-29.

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Solid dispersions of ofloxacin (OFX) and of a number of carriers including chitosan and the water soluble polymers polyethylene glycol (PEG) 4000, PEG 20000, and polyvinylpyrrolidone K- 90 were prepared by solvent evaporation method in order to increase the dissolution of the drug. The solid dispersions were subjected to X-ray diffraction, DSC, and dissolution to characterize their physicochemical and dissolution properties. The results demonstrated a decrease in drug crystallinity at higher amounts of carrier. Dissolution studies indicated that the dissolution rate of OFX was markedly increas

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Harmely, Fifi, Salman Umar, Yufri Aldi, Ellyza Nasrul, and Erizal Zaini. "Preparation and Physicochemical Characterization of Solid Dispersion of Irbesartan with Poloxamer 188." Open Access Macedonian Journal of Medical Sciences 8, A (2020): 16–19. http://dx.doi.org/10.3889/oamjms.2020.3102.

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AIM: The aim of the present study was to prepare and characterize the solid dispersion of poorly soluble drugs irbesartan with hydrophilic polymer poloxamer 188 by solvent co-evaporation technique. METHODS: The ratio of irbesartan to poloxamer 188 in solid dispersion system was 1:0.5; 1:1; and 1:3. Physicochemical properties characterization was analyzed by X-ray powder diffraction, Fourier-transform infrared (FT-IR) spectroscopy, differential thermal analysis, and scanning electron microscopy (SEM). The in vitro dissolution rate profile of solid dispersion was performed by Type II Unite

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Sultan, Asriana, Nur Ida, and Isriany Ismail. "Peningkatan Kadar Ketoprofen Terdisolusi melalui Pembentukan Dispersi Padat menggunakan Polivinil Alkohol (PVA)." Jurnal Farmasi Galenika (Galenika Journal of Pharmacy) (e-Journal) 5, no. 1 (2019): 43–48. http://dx.doi.org/10.22487/j24428744.2019.v5.i1.12096.

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Ketoprofen is included in the Class II of Biopharmaceutical Classification System (BCS) which has low solubility. Low solubility will affect the dissolution rate and the dissolved concentration, so the absorption and bioavailability are low as well. Several studies have been conducted to improve the solubility and the dissolution of drugs from these group, such as by solid dispersion system. This study aims to determine the effect of polyvinyl alcohol (PVA) on the dissolved concentration of ketoprofen in solid dispersion and in physical mixture, and to decidethe optimum formula.Solid dispersio

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Lalovic, Ana. "Calculation of velocity dispersion of the nearby galaxies using different stellar template libraries." Serbian Astronomical Journal, no. 180 (2010): 57–69. http://dx.doi.org/10.2298/saj1080057l.

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We present the central velocity dispersion measurements of the nearby galaxies from the Sloan Digital Sky Survey (SDSS). Using the sample from the paper by Ho et al. 2009, we have selected 23 galaxies for which we calculate the velocity dispersion. We have used the Penalized Pixel-Fitting code (Cappellari and Emsellem2004) to measure the velocity dispersion throughout the four chosen spectral regions: (3800,4568)?A, (4568,5336)?A, (5336,6104) and (6104,6872)?A. In all these regions, we have separately calculated dispersions and corresponding errors. We found that the measured values may vary w

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Chiaraluce, E., F. Vagnetti, F. Tombesi, and M. Paolillo. "The X-ray/UV ratio in active galactic nuclei: dispersion and variability." Astronomy & Astrophysics 619 (November 2018): A95. http://dx.doi.org/10.1051/0004-6361/201833631.

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Context. The well established negative correlation between the αOX spectral slope and the optical/ultraviolet (UV) luminosity, a by-product of the relation between X-rays and optical/UV luminosity, is affected by relatively large dispersion. The main contributors to this dispersion can be variability in the X-ray/UV ratio and/or changes in fundamental physical parameters. Aims. We want to quantify the contribution from variability within single sources (intra-source dispersion) and that from variations of other quantities different from source to source (inter-source dispersion). Methods. We u

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Dyah, Ayu Kunthi Puspitasari, and Basti Farani Dinesh. "ANALISIS KINERJA PENGAJAR : PENGARUH KEPEMIMPINAN TRANSFORMASIONAL, IKLIM KERJA, DAN KEPUASAN KERJA." MADANI: Jurnal Ilmiah Multidisiplin 1, no. 2 (2023): 92–100. https://doi.org/10.5281/zenodo.7782501.

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Metode klasifikasi yang memiliki proses seleksi fitur adalah algoritma decision tree. Proses seleksi fitur pada algortima decision tree biasanya menggunakan fungsi Information Gain. Information gain  pada algoritma decision tree memiliki kelemahan jika ada dataset yang memiliki atribut key seperti Product-ID. Fungsi dispersion ratio pada algoritma decision tree dapat meningkatkan signifikansi proses seleksi fitur, sehingga dapat mengatasi kekurangan fungsi information gain. Proses splitting atribut pada decision tree menggunakan fungsi dispersion ratio dengan menggunakan dataset yang diam

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Zhou, Heng, Zhiguo Luo, Tao Zhang, Yang You, Haifeng Li, and Zongshu Zou. "Influence of Rolling Friction Coefficient on Inter-Particle Percolation in a Packed Bed by Discrete Element Method." Archives of Metallurgy and Materials 61, no. 4 (2016): 1795–804. http://dx.doi.org/10.1515/amm-2016-0291.

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Abstract Rolling friction representing the energy dissipation mechanism with the elastic deformation at the contact point could act directly on particle percolation. The present investigation intends to elucidate the influence of rolling friction coefficient on inter-particle percolation in a packed bed by discrete element method (DEM). The results show that the vertical velocity of percolating particles decreases with increasing the rolling friction coefficient. With the increase of rolling friction coefficient, the transverse dispersion coefficient decreases, but the longitudinal dispersion

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Dong, Xia, Zhao He Zheng, and Jin Xin He. "Influence of Dye-Polyether Derivatives Architecture on Parent C. I. Disperse Yellow 64 Dispersion." Advanced Materials Research 79-82 (August 2009): 1931–34. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1931.

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Interface stability has been the subject of extensive investigation by the scientists working in the field of micron or nanometer materials for centuries and the control of the colloidal properties and stability of particle dispersions is of significant importance in the manufacture of high quality water-based dispersions or solvent-based systems. The waterborne dispersion of C.I. Disperse Yellow 64 requires the use of dispersant additives. By the reaction of C.I. Disperse Yellow 64 with poly(oxyalkylene)-amines, a series of dye-polyether derivatives, supposed to be used as dispersants for par

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Gao, Jie, Xin-Kang Wang, and Hui Chen. "The Relationship Between P-Wave Dispersion, QTc Dispersion, and Gestational Hypertension." American Journal of Hypertension 35, no. 2 (2022): 207. http://dx.doi.org/10.1093/ajh/hpab118.

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Abstract Background To analyze the relationship between gestational hypertension and P-wave dispersion and QTc interval dispersion. Methods From January 2017 to December 2019, 213 pregnant women who met the diagnosis of hypertension were selected as gestational hypertension with 248 healthy pregnant women as controls. The basic data, P-wave dispersion, and QTc dispersion were compared between the 2 groups, and binary logistic regression analysis was performed. Results The minimum time of P wave (78.59 ± 9.32 vs. 94.61 ± 7.03 ms) and the minimum time of QTc (384.65 ± 21.69 vs. 401.91 ± 15.49 ms

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Eitzen, Lars, Aki Sebastian Ruhl, and Martin Jekel. "Particle Size and Pre-Treatment Effects on Polystyrene Microplastic Settlement in Water: Implications for Environmental Behavior and Ecotoxicological Tests." Water 12, no. 12 (2020): 3436. http://dx.doi.org/10.3390/w12123436.

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Microplastic (MP) particle dispersions used in many recent publications covering adsorption or toxicological studies are not characterized very well. The size distribution of polydisperse dispersions is highly dependent on the agglomeration processes and influences experimental outcomes. Therefore, pre-treatment is a prerequisite for reproducibility. In this study, manual/automated shaking and ultrasonic treatment as different mechanical dispersion techniques were applied for the dispersion of cryomilled polystyrene (PS). Particle numbers and size distribution of dispersions were analyzed by a

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Shin, Jaehyun, Sunmi Lee, and Inhwan Park. "Influences of Momentum Ratio on Transverse Dispersion for Intermediate-Field Mixing Downstream of Channel Confluence." International Journal of Environmental Research and Public Health 20, no. 4 (2023): 2776. http://dx.doi.org/10.3390/ijerph20042776.

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This study aims to analyze the influences of momentum ratio (Mr) and confluence angle (α) on the transverse dispersion in an urban scale confluence channel from the numerical simulation results using the Environmental Fluid Dynamics Code model. By changing the momentum flux and confluence angle from the simulation results, the analysis focused on the relations between the vertical variations of transverse velocity and transverse dispersion. The high momentum tributary aligned the mixing interface toward the outer bank and created a strong helical motion, which transported the contaminated wate

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Goyani, Manish, Meghraj Suryawanshi, and Nikunjkumar Gandhi. "PREPARATION AND CHARACTERIZATION OF SOLID DISPERSION USEFUL IN MAKING SUBLINGUAL TABLETS OF PIROXICAM." INDIAN DRUGS 61, no. 05 (2024): 59–63. http://dx.doi.org/10.53879/id.61.05.14597.

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This study aimed to investigate the usage of solid dispersion (SD) to enhance the dissolution rate of the poorly soluble drug piroxicam for sublingual formulation. Poloxamer grade 407 (Kolliphor® P-407), a commercially available polymer, was chosen, and various solid dispersions with different weight ratios of piroxicam and Poloxamer were prepared using the hot melt method. Compatibility tests using FTIR spectroscopy, DSC, and XRD were conducted to assess any chemical or physical interactions between the drug and polymer. In vitro dissolution tests were performed on the solid dispersions. The

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Kyoung, Jaisun, Younggil Park, and Nari Ahn. "P‐260: Late‐News Poster: Doping Ratio Control of Organic Composite Layer in OELDs by Spectroscopic Ellipsometry." SID Symposium Digest of Technical Papers 55, no. 1 (2024): 2248–49. http://dx.doi.org/10.1002/sdtp.18060.

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The OLEDs industry needs a reliable nondestructive process control method for measuring the correct thickness of layers and estimation of doping or mixing ratio. Using spectroscopic ellipsometry, we applied for thickness and doping ratio monitoring for emission layer (EML) and mixed electron transport layer (mETL) grown on glass by evaporator. Optical properties of EML host and dopant, mETL host and mixing material have been investigated. We present the effect of doping on optical constants dispersions of EML and mETL layers in the photon energy range 1.2 to 5.0 eV. We adopted the Effective Me

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