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Articoli di riviste sul tema "Dispersion management"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 maggio 2024

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1

Berntson, Anders, and Boris A. Malomed. "Dispersion management with filtering." Optics Letters 24, no. 8 (April 15, 1999): 507. http://dx.doi.org/10.1364/ol.24.000507.

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2

Porsezian, Kuppusamy, Ramanathan Ganapathy, Akira Hasegawa, and Vladimir N. Serkin. "Nonautonomous Soliton Dispersion Management." IEEE Journal of Quantum Electronics 45, no. 12 (December 2009): 1577–83. http://dx.doi.org/10.1109/jqe.2009.2027819.

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3

Turitsyn, Sergei K., Vladimir K. Mezentsev, and Elena G. Shapiro. "Dispersion-Managed Solitons and Optimization of the Dispersion Management." Optical Fiber Technology 4, no. 4 (October 1998): 384–452. http://dx.doi.org/10.1006/ofte.1998.0271.

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4

Dombi, Péter, Péter Rácz, Miklós Lenner, Volodymyr Pervak, and Ferenc Krausz. "Dispersion management in femtosecond laser oscillators with highly dispersive mirrors." Optics Express 17, no. 22 (October 23, 2009): 20598. http://dx.doi.org/10.1364/oe.17.020598.

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5

Leo, Annalisa De, and Nicoletta Tambroni, Alessandro Stocchino. "EXPERIMENTAL STUDY OF LAGRANGIAN MIXING IN WEAKLY DISSIPATIVE TIDAL CHANNELS." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 33. http://dx.doi.org/10.9753/icce.v37.management.33.

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Estuaries are extremely dynamic environments, allowing wildlife to grow in a wide variety of ecosystems because of the interaction of masses of water with different characteristics. In particular, coastal bays and estuaries are characterized by flows driven by hydraulic unbalance such as baroclinic pressure gradients, river inflows and wind stresses, and tidal waves. Here, following a reductionist approach, we examine dispersion processes in a physical model of a tidal channel bounded by an inlet mouth, with tides as the dominant forcing. The presence of a tidal inlet can generate macro-vortices that during a tidal cycle may influence the momentum and mass transport on relatively large distances (Awaji et al. (1980), Awaji (1982), Branyon et al. (2022)). Moreover, tides tend to produce non-monotonic particle velocity correlation leading to possible particle looping trajectories that also reflect on a looping character of the Lagrangian integral time scales, differently from the classical statistically steady or homogeneous turbulence (Enrile et al. (2019)). Our goal is to examine the dispersion regimes by means of two-dimensional velocity measurements at the free surface reproduced in a large-scale physical model as a starting point for Lagrangian analysis. We show how the presence of a tidal inlet generates complex flow patterns depending on the character of the forcing tides. Furthermore, the mixed nature of tides may be crucial to dispersion processes, as it enhances the ability of the flow to transport mass in the direction of the main flow.

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de Silva, Harindra, Steven Sapra, and Steven Thorley. "Return Dispersion and Active Management." Financial Analysts Journal 57, no. 5 (September 2001): 29–42. http://dx.doi.org/10.2469/faj.v57.n5.2479.

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Sackley, William H. "Return Dispersion and Active Management." CFA Digest 32, no. 2 (May 2002): 92–93. http://dx.doi.org/10.2469/dig.v32.n2.1094.

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8

Zharnitsky, Vadim, Emmanuel Grenier, Christopher K. R. T. Jones, and Sergei K. Turitsyn. "Stabilizing effects of dispersion management." Physica D: Nonlinear Phenomena 152-153 (May 2001): 794–817. http://dx.doi.org/10.1016/s0167-2789(01)00213-5.

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9

Shi, Guifeng, Jianfei Sun, and Rui Luo. "Geographic dispersion and earnings management." Journal of Accounting and Public Policy 34, no. 5 (September 2015): 490–508. http://dx.doi.org/10.1016/j.jaccpubpol.2015.05.003.

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10

Atai, Javid, and Boris A. Malomed. "Stabilized scheme for dispersion management." Journal of the Optical Society of America B 17, no. 7 (July 1, 2000): 1134. http://dx.doi.org/10.1364/josab.17.001134.

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11

Xu, Zheng, Yan Xue, and Zhihao Huang. "Dependence of Dispersion on Metamaterial Structural Parameters and Dispersion Management." Applied Sciences 8, no. 7 (June 28, 2018): 1057. http://dx.doi.org/10.3390/app8071057.

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12

Jianjun, Yu, Guan Kejian, Yang Qimin, and Yang Bojun. "Allocating different normal-and abnormal-dispersion fibers for dispersion management." Microwave and Optical Technology Letters 15, no. 2 (June 5, 1997): 106–10. http://dx.doi.org/10.1002/(sici)1098-2760(19970605)15:2<106::aid-mop13>3.0.co;2-8.

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13

Khelil, K., K. Saouchi, and D. Bahloul. "Effect of Fourth-Order Dispersion on Solitonic Interactions." Ukrainian Journal of Physics 65, no. 5 (May 11, 2020): 378. http://dx.doi.org/10.15407/ujpe65.5.378.

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Solitons became important in optical communication systems thanks to their robust nature. However, the interaction of solitons is considered as a bad effect. To avoid interactions, the obvious solution is to respect the temporal separation between two adjacent solitons determined as a bit rate. Nevertheless, many better solutions exist to decrease the bit rate error. In this context, the aim of our work is to study the possibility to delete the interaction of adjacent solitons, by using a special dispersion management system, precisely by introducing both of the third- and fourth-order dispersions in the presence of a group velocity dispersion. To study the influence of the fourth- and third-order dispersions, we use the famous non-linear Schr¨odinger equation solved with the Fast Fourier Transform method. The originality of this work is to bring together the dispersion of the fourth, third, and second orders to separate two solitons close enough to create the Kerr-induced interaction and consequently to improve the propagation by decreasing the bit rate error. This study illustrates the influence of the fourth-order dispersion on one single soliton and two co-propagative solitons with different values of the temporal separation. Then the third order dispersion is introduced in the presence of the fourth-order dispersion in the propagation of one and two solitons in order to study its influence on the interaction. Finally, we show the existence of a precise dispersion management system that allows one to avoid the interaction of solitons.

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14

Chi, Yu-Ho, and David A. Ziebart. "Benefits of management disclosure precision on analysts’ forecasts." Review of Accounting and Finance 13, no. 4 (November 4, 2014): 371–99. http://dx.doi.org/10.1108/raf-06-2012-0061.

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Purpose – The purpose of this paper is to examine the impact of management’s choice of forecast precision on the subsequent dispersion and accuracy of analysts’ earnings forecasts. Design/methodology/approach – Using a sample of 3,584 yearly management earnings per share (EPS) forecasts and 10,287 quarterly management EPS forecasts made during the period of 2002-2007 and collected from the First Call database, the authors controlled for factors previously found to impact analysts’ forecast accuracy and dispersion and investigate the link between management forecast precision and attributes of the analysts’ forecasts. Findings – Results provide empirical evidence that managements’ disclosure precision has a statistically significant impact on both the dispersion and the accuracy of subsequent analysts’ forecasts. It was found that the dispersion in analysts’ forecasts is negatively related to the management forecast precision. In other words, a precise management forecast is associated with a smaller dispersion in the subsequent analysts’ forecasts. Evidence consistent with accuracy in subsequent analysts’ forecasts being positively associated with the precision in the management forecast was also found. When the present analysis focuses on range forecasts provided by management, it was found that lower precision (a larger range) is associated with a larger dispersion among analysts and larger forecast errors. Practical implications – Evidence suggests a consistency in inferences across both annual and quarterly earnings forecasts by management. Accordingly, recent calls to eliminate earnings guidance through short-term quarterly management forecasts may have failed to consider the linkage between the attributes (precision) of those forecasts and the dispersion and accuracy in subsequent analysts’ forecasts. Originality/value – This study contributes to the literature on both management earnings forecasts and analysts’ earnings forecasts. The results assist in policy deliberations related to calls to eliminate short-term management earnings guidance.

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15

Musliman, I. A., and L. Yohnny. "Modelling airborne dispersion for disaster management." Journal of Physics: Conference Series 852 (May 2017): 012026. http://dx.doi.org/10.1088/1742-6596/852/1/012026.

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16

Ganapathy, R., K. Porsezian, A. Hasegawa, and V. N. Serkin. "Soliton Interaction Under Soliton Dispersion Management." IEEE Journal of Quantum Electronics 44, no. 4 (April 2008): 383–90. http://dx.doi.org/10.1109/jqe.2007.914778.

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17

Michalik, Damian, Tomasz Stefaniuk, and Ryszard Buczynski. "Dispersion Management in Hybrid Optical Fibers." Journal of Lightwave Technology 38, no. 6 (March 15, 2020): 1427–34. http://dx.doi.org/10.1109/jlt.2019.2952250.

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18

Kutz, J. Nathan, C. Lyngå, and B. J. Eggleton. "Enhanced Supercontinuum Generation through Dispersion-Management." Optics Express 13, no. 11 (2005): 3989. http://dx.doi.org/10.1364/opex.13.003989.

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19

., Suruchi Bala. "SOLITONS: NOVEL APPROACH FOR DISPERSION MANAGEMENT." International Journal of Research in Engineering and Technology 04, no. 07 (July 25, 2015): 411–18. http://dx.doi.org/10.15623/ijret.2015.0407066.

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20

Byun, Sanghyuk, Youngjoo Lee, and Ohjin Kwon. "The Effect Of Abnormal Pay Dispersion On Earnings Management." Journal of Applied Business Research (JABR) 32, no. 2 (March 1, 2016): 687. http://dx.doi.org/10.19030/jabr.v32i2.9604.

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This study examines the effect of the abnormal pay dispersion on earnings management. Prior studies find that pay dispersion among top executives affect firm performance and executive turnover. We expect that abnormal pay dispersion among top executives affects financial reporting practice as well as firm performance and turnover and provide evidence of positive association between abnormal pay dispersion and earnings management. This result suggests that executives are more likely to be engaged in earnings management to increase their compensation when they feel unfairness from the relative level of compensation. This finding helps financial statement users interpret firm performance and anticipate future outcomes by implying that additional managerial incentives for financial reporting are derived from internal pay dispersion. Our finding that abnormal pay dispersion leads to higher agency costs should also be of interest to shareholders.

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21

Wang, Shan, Zhiguo Lv, and Jintao Qiu. "Dispersion Management Nonlinear Multimode Interference Mode-Locked Ytterbium Fiber Laser." Nanomaterials 13, no. 3 (January 28, 2023): 535. http://dx.doi.org/10.3390/nano13030535.

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Dispersion management plays an important role in improving the output performance of a mode-locked fiber laser. Therefore, dispersion management is carried out by introducing the grating pair in our experiment. Through adjusting the distance between the grating pair, mode-locked pulses corresponding to different dispersion regimes can be realized, which typically range from soliton state in the anomalous dispersion regime to the dissipative soliton format in the normal dispersion regime. Furthermore, tunable spectrum distribution can be achieved by adjusting two intra-cavity polarization controllers. The proposed dispersion management method complements mode-locking techniques based on nonlinear multimode interference (NL-MMI). The laser can operate with self-start mode locking stably and is useful for practice applications.

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22

Bushman, Robert M., Zhonglan Dai, and Weining Zhang. "Management Team Incentive: Dispersion and Firm Performance." Accounting Review 91, no. 1 (March 1, 2015): 21–45. http://dx.doi.org/10.2308/accr-51112.

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ABSTRACT Recent theory suggests that firms incorporate synergistic interrelationships among executives into optimal incentive design (Edmans, Goldstein, and Zhu 2013). We focus on Pay Performance Sensitivities (PPS) and use dispersion in PPS across top executives as a proxy for the incentive design component shaped by an executive team's synergy profile. We model optimal PPS dispersion and use residuals from this model to measure deviations from optimal. We find that firm performance is increasing (decreasing) in the residual when PPS dispersion is too low (too high). We conjecture that deviations from optimal are sustained by adjustment costs, finding that firms only close around 60 percent of the gap between target and actual PPS dispersion over the subsequent year. Viewing a team's equity grants as a vector, we provide evidence that firms use subsequent equity grants to actively manage PPS dispersion toward optimality. Cross-sectional analysis reveals that the deleterious effect of deviations from optimal is decreasing in the duration of a team's tenure together, and increasing in the importance of effort coordination across team members for firm performance. JEL Classifications: M41.

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23

Renversez, G., B. Kuhlmey, and R. McPhedran. "Dispersion management with microstructured optical fibers: ultraflattened chromatic dispersion with low losses." Optics Letters 28, no. 12 (June 15, 2003): 989. http://dx.doi.org/10.1364/ol.28.000989.

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24

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 (October 28, 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 pure drug. In in vitro release profiles revealed that formulation SD20, having drug: Kolliphor® P 407 in 1:9 ratio exhibited highest dissolution rate. The powder X-ray diffraction study and scanning electron microscopy (SEM) exhibited a crystalline to an amorphous transformation in the solid dispersion. The study demonstrated that solid dispersions are a highly effective technique to increase solubility and bioavailability of febuxostat.

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25

Wang, Jing-Shang, Dong-Liang Wang, and Guo-Qing Chang. "Dispersion management dual-pass self-phase modulation-enabled spectral selection." Acta Physica Sinica 72, no. 9 (2023): 094205. http://dx.doi.org/10.7498/aps.72.20230088.

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Self-phase modulation-enabled spectral selection (SESS) technology can generate wavelength-tunable femtosecond pulses, and it is expected to replace traditional complex optical parametric oscillators, and thus has attracted much attention. However, the positive dispersion in the fiber leads the modulation depth of the spectral lobes to decrease, while optical wave breaking hinders the spectral broadening. In order to solve the two problems, we propose a dual-pass SESS technology based on dispersion management which optimizes the shape of the front edge and rear edge of the pulse prior to the second pass by introducing negative dispersion, and compresses the pulse width for increasing the peak power of the pulse. The resulting spectrum features broader spectrum with a deeper modulation depth. By numerical simulation, we find that adjusting the value of the second-order dispersion compensated after the single pass, a broader spectral lobe can be obtained than both the single-pass case and the double-pass case without dispersion compensation. To verify our numerical simulation, we conduct experiments by using a 2-cm-long LMA-8 fiber for spectral broadening and several chirped mirrors to provide negative dispersion, which controls the nonlinear evolution of the pulse in the second pass of the LMA-8 fiber. We study the spectral output corresponding to different amounts of dispersion compensation and find that an optimal dispersion value is required to produce a clear and broader spectral lobe. We also investigate the effect of input pulse energy on spectral broadening under the same dispersion compensation conditions. With 15-nJ input pulse energy and –420 fs<sup>2</sup> dispersion compensation, the resulting SESS source delivers 6 nJ, 113-fs pulses with the peak wavelength at 920 nm.

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Yadav, Pankajkumar. "Abstract 10 — Enhancing Dissolution Efficiency of Ketoprofen, A Rheumatoid Arthritis Pain Management Drug, through Solid Dispersion Formulation." Journal of Clinical Rheumatology and Immunology 23, Supp01 (November 2023): 29. http://dx.doi.org/10.1142/s2661341723740267.

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Background Ketoprofen (KPN) is commonly prescribed drug to alleviate pain related with rheumatoid arthritis (RA). However, KETO belongs to the BCS class-II category, characterized by poor water solubility, resulting in less dissolution capability leading to limited systemic absorption. Purpose of this study was to increase aqueous solubility as well as rate of dissolution of KPN using solid-dispersion technique. Methods Two different hydrophilic carriers, D-mannitol and polyvinylpyrrolidone K30 (PVP K30) and, were utilized, in varying ratios with the drug, to formulate solid dispersions. Kneading and solvent evaporation techniques were employed for preparing KPN solid dispersions with PVP K30, while kneading and melting methods were utilized for solid dispersions containing D-mannitol. The liquid state of the formulations was characterized through phase-solubility studies, while Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR) spectroscopy, Differential Scanning Calorimetry (DSC) and X-ray diffraction (XRD) analysis were performed to examine the solid state. Results Both carriers demonstrated a favorable impact on the aqueous solubility of KPN. Solid state examination of D-mannitol solid dispersions revealed that KPN existed as fine particles, while it was entrapped within the polymer matrix in solid dispersions with PVP K30. Compared to poor rate of dissolution of pure drug KPN, the drug dispersions in both carriers showed a significantly improved dissolution rate. Improvement of dissolution rate can be ascribed to enhanced wetting behavior and dispersion of fine particles along with reduced crystalline fraction and an increase in the amorphous nature of KPN. Conclusion PVP K30 solid dispersions of KPN exhibited a noteworthy enhancement in the dissolution efficacy of KPN. Moreover, physical mixtures of KPN exhibited better dissolution profiles with D-mannitol and PVP K30 in comparison to pure KPN.

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Figueiredo, Alex, Thadeu Rodrigues de Melo, Jean Carlo Santos de Oliveira, Wesley Machado, José Francirlei de Oliveira, Julio Cezar Franchini, Henrique Debiasi, and Maria de Fátima Guimarães. "The no-tillage, with crop rotation or succession, can increase the degree of clay dispersion in the superficial layer of highly weathered soils after 24 years." Semina: Ciências Agrárias 42, no. 1 (January 19, 2021): 57–70. http://dx.doi.org/10.5433/1679-0359.2021v42n1p57.

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Clay dispersion is directly related to water erosion, especially during detaching and dragging of particles. No-till is one of the most important strategies for soil and water conservation in tropical and sub-tropical regions, and when associated with crop rotation, may reduce the degree of clay dispersion. The study aimed to evaluate, after 24 years, the effect of different soil management systems and crop systems on the degree of clay dispersion of a Rhodic Ferralsol. The experimental design was completely randomized in a 4x2 factorial scheme, with four soil managements (continuous no-tillage, no-tillage with chiseling every three years, disk plowing followed by light harrowing and heavy disking followed by light harrowing) and with two crop systems (crop succession and rotation). The degree of clay dispersion was evaluated and associated with soil chemical attributes from layer 0.00-0.10 m. The degree of clay dispersion is affected by the soil management systems with no effect of crop systems. The soil management system with the lowest soil disturbance (continuous no-tillage) has a higher degree of clay dispersion than the ones that disturb the soil, regardless of the agricultural implement used or soil disturbance intensity. The soil electrochemical imbalance, primarily caused by soil potential acidity, is positively correlated to the increase in the degree of clay dispersion of the superficial soil layer under continuum no-tillage.

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Pinto, Luís Abegão, Ingeborg Stalmans, and Camille Van Mierlo. "Surgical Management of Iatrogenic Pigment Dispersion Glaucoma." Journal of Current Glaucoma Practice 9, no. 1 (January 15, 2015): 28–32. http://dx.doi.org/10.5005/jp-journals-10008-1180.

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Gabitov, I. R., and P. M. Lushnikov. "Nonlinearity management in a dispersion-managed system." Optics Letters 27, no. 2 (January 15, 2002): 113. http://dx.doi.org/10.1364/ol.27.000113.

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Moeser, J., I. Gabitov, and C. K. R. T. Jones. "Pulse stabilization by high-order dispersion management." Optics Letters 27, no. 24 (December 15, 2002): 2206. http://dx.doi.org/10.1364/ol.27.002206.

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Biswas, Anjan. "Dynamics of optical solitons with dispersion-management." Chaos, Solitons & Fractals 14, no. 3 (August 2002): 447–68. http://dx.doi.org/10.1016/s0960-0779(01)00215-6.

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Gallino, Santiago, Antonio Moreno, and Ioannis Stamatopoulos. "Channel Integration, Sales Dispersion, and Inventory Management." Management Science 63, no. 9 (September 2017): 2813–31. http://dx.doi.org/10.1287/mnsc.2016.2479.

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Shuai Li, Cheng Wang, Yanqi Liu, Yi Xu, Zhengzheng Liu, Jun Lu, Yanyan Li, et al. "Dispersion management of the SULF front end." Quantum Electronics 47, no. 3 (March 31, 2017): 179–83. http://dx.doi.org/10.1070/qel16318.

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Ganapathy, R. "Soliton dispersion management in nonlinear optical fibers." Communications in Nonlinear Science and Numerical Simulation 17, no. 12 (December 2012): 4544–50. http://dx.doi.org/10.1016/j.cnsns.2012.03.039.

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Chen, Peter Y. P., Boris A. Malomed, and Pak L. Chu. "Optimal preprocessing of pulses for dispersion management." Journal of the Optical Society of America B 23, no. 7 (July 1, 2006): 1257. http://dx.doi.org/10.1364/josab.23.001257.

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Sysoliatin, Alexej A., Andrew K. Senatorov, Andrey I. Konyukhov, Leonid A. Melnikov, and Vladimir A. Stasyuk. "Soliton fission management by dispersion oscillating fiber." Optics Express 15, no. 25 (2007): 16302. http://dx.doi.org/10.1364/oe.15.016302.

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Ablowitz, Mark J., and Jamison T. Moeser. "Dispersion management for randomly varying optical fibers." Optics Letters 29, no. 8 (April 15, 2004): 821. http://dx.doi.org/10.1364/ol.29.000821.

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Qin, Xilin, Zhixian Gui, Fei Yang, and Yuanyuan Liu. "Anisotropic frequency-dependent characteristics of PP- and PS-waves in partially saturated double-porosity rocks." Journal of Geophysics and Engineering 18, no. 3 (June 2021): 355–68. http://dx.doi.org/10.1093/jge/gxab019.

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Abstract Most frequency-dependent AVO inversions are currently based on an approximate equation derived using an isotropic medium. However, actual reservoirs usually show anisotropy, such as shale reservoirs, tight sandstone reservoirs and fractured reservoirs. We propose a joint frequency-dependent AVO (JFAVO) inversion in an anisotropic medium based on a periodic layered double-porosity medium. This JFAVO will allow us to quantitatively study the influence of fluids on the dispersion of PP- and PS-wave velocities and anisotropic parameters. First, we used a double-porosity medium to analyse the frequency-dependent characteristics of velocities and anisotropy parameters. We found that the anisotropic parameters show obvious dispersions, similar to those of velocities. Then, we derived the JFAVO inversion based on Rüger's equation to extract the dispersion of velocities and anisotropic parameters. Finally, we analysed the stability and applicability of the inversion algorithm, and used three sets of models to analyse the sensitivity of dispersion properties to fluids. The numerical analysis results show that PP-wave velocity dispersion and anisotropic parameter δ dispersion are sensitive to fluids, whereas, the velocity dispersion of the PS-wave is not. When saturation exceeds 80%, the velocity dispersion and anisotropic parameter dispersion properties are not sensitive to fluids.

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Garnier, J. "Stabilization of dispersion-managed solitons in random optical fibers by strong dispersion management." Optics Communications 206, no. 4-6 (June 2002): 411–38. http://dx.doi.org/10.1016/s0030-4018(02)01404-9.

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Liu, Ziwei, and Yibing Ding. "Dispersion or Agglomeration." Journal of Global Information Management 31, no. 6 (April 13, 2023): 1–17. http://dx.doi.org/10.4018/jgim.321177.

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The paper analyzes the agglomeration of China's OFDI across 35 industries in 43 countries from 2014 to 2019 to provide a characterization of China's international production system and its dynamic changes. It examines how digital service trade barriers and regulatory heterogeneity impact China's OFDI agglomeration. The paper finds that China's OFDI distribution shows a trend of agglomerating at the host country-industry level year by year, especially in capital-intensive and technology-intensive industries. Empirical results indicate that digital services trade barriers significantly hinder the agglomeration of China's OFDI. Digital service trade barriers negatively affect OFDI agglomeration in technology-intensive industries and positively affect it in labor-intensive industries. Deconstructing digital service trade barriers in different policy areas, the paper finds that the negative impact of infrastructure and connectivity and intellectual property rights is greater than that in electronic transactions, while the impact of barriers in the payment system is not significant.

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Pawar, Anil Raosaheb, Pralhad Vitthalrao Mundhe, Vinayak Kashinath Deshmukh, Ramdas Bhanudas Pandhare, and Tanaji Dilip Nandgude. "Enrichment of aqueous solubility and dissolution profile of mesalamine: In vitro evaluation of solid dispersion." Journal of Pharmaceutical and Biological Sciences 9, no. 2 (November 15, 2021): 127–35. http://dx.doi.org/10.18231/j.jpbs.2021.018.

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The aim of the present study was to formulate solid dispersion (SD) of Mesalamine to enrich the aqueous solubility and dissolution rate. Mesalamine is used in the management of acute ulcerative colitis and for the prevention of relapse of active ulcerative colitis. In the present study, Solid dispersion of Mesalamine was prepared by Fusion and Solvent evaporation method with different polymers. SD’s were characterized by % practical yield, drug content, Solubility, FT-IR, PXRD (Powder X- ray diffractometry), SEM (Scanning electron microscopy), in vitro dissolution studies and Stability studies. The percent drug release of prepared solid dispersion of Mesalamine by fusion and solid dispersion method (FM47, FM67, SE47 and SE67) in 1:7 ratio was found 81.36±0.41, 86.29±0.64, 82.45±0.57and 87.25±1.14 respectively. The aqueous solubility and percent drug release of solid dispersion of Mesalamine by both methods was significantly increased. The PXRD demonstrated that there was a significant decrease in crystallinity of pure drug present in the solid dispersions, which resulted in an increased aqueous solubility and dissolution rate of Mesalamine.The significant increase in aqueous solubility and dissolution rate of Mesalamine was observed in solid dispersion as the crystallinity of the drug decreased, absence of aggregation and agglomeration, increased wetability and good dispersibility after addition of PEG 4000 and PEG 6000.

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42

Bose, S. K., P. Ray, and B. K. Dutta. "Mathematical Models for Mixing and Dispersion in Forecasting and Management of Estuarine Water Quality." Water Science and Technology 19, no. 9 (September 1, 1987): 183–93. http://dx.doi.org/10.2166/wst.1987.0079.

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Abstract (sommario):

The dispersion or spread of a dissolved or suspended substance in an estuarine system occurs mainly due to the non-uniformity of velocity distribution, including turbulent fluctuations, shear stress at the boundary and surface stress caused by winds. The mixing and dispersion phenomena in rivers and estuaries are extremely important in water quality management and control. The development of a dispersion model in harmony with the nature of the flow field in a river or estuary is necessary in the estimation and correlation of dispersion parameters, called dispersion coefficients, which may, in general, be anisotropic in a multidimensional transport process. The earlier one-dimensional models have gradually given way to higher dimensional models for better description of the phenomena as well as for more accurate estimation of parameters. Field studies of dispersion of tracers have been the most important method of generating data for parameter estimation. A number of correlations for mixing and dispersion coefficients in terms of flow rates and other fundamental system parameters are available. The present study incorporates the analysis, assessment and applications of various dispersion and mixing models available. Also, a critical appraisal of the validity, inherent degree of uncertainty and the range of applications of different correlations has been incorporated.

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43

Aleshkina, Svetlana, and Mikhail Likhachev. "All-glass hybrid fibers for dispersion management [Invited]." Journal of the Optical Society of America B 38, no. 12 (November 17, 2021): F115. http://dx.doi.org/10.1364/josab.437891.

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44

Liu, Xingyan, Cheng Wang, Xinliang Wang, Xiaoming Lu, Peile Bai, Yanqi Liu, Yanyan Li, et al. "Dispersion Management in 10-PW Laser Front End." Optics 1, no. 2 (July 15, 2020): 191–201. http://dx.doi.org/10.3390/opt1020015.

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Abstract (sommario):

To improve pulse contrast in chirped pulse amplification petawatt laser systems, the regenerative amplifier is substituted with a multipass amplifier at the Shanghai Superintense Ultrafast Laser Facility (SULF). To reduce the consequent angular dispersion of the broadband spectrum, a double-grating stretcher is established in the SULF front end. A grating compressor is set up for the 10-PW front end to obtain 20-TW output. An accurate adjustment method of grating attitude (angular position) is presented, which references the direction of gravity, improving dispersion management and focusing ability of the beam. After a pulse passes the front end compressor, its duration and phase in the frequency domain are measured, and the duration can be continuously compressed to <24 fs.

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45

Paré, C., and P. A. Bélanger. "Spectral domain analysis of dispersion management without averaging." Optics Letters 25, no. 12 (June 15, 2000): 881. http://dx.doi.org/10.1364/ol.25.000881.

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46

Paré, C., V. Roy, F. Lesage, P. Mathieu, and P. A. Bélanger. "Coupled-field description of zero-average dispersion management." Physical Review E 60, no. 4 (October 1, 1999): 4836–42. http://dx.doi.org/10.1103/physreve.60.4836.

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47

Smith, N. J., and N. J. Doran. "Modulational instabilities in fibers with periodic dispersion management." Optics Letters 21, no. 8 (April 15, 1996): 570. http://dx.doi.org/10.1364/ol.21.000570.

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48

Forysiak, W., J. F. L. Devaney, N. J. Smith, and N. J. Doran. "Dispersion management for wavelength-division-multiplexed soliton transmission." Optics Letters 22, no. 9 (May 1, 1997): 600. http://dx.doi.org/10.1364/ol.22.000600.

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49

Kurtzke, C. "Suppression of fiber nonlinearities by appropriate dispersion management." IEEE Photonics Technology Letters 5, no. 10 (October 1993): 1250–53. http://dx.doi.org/10.1109/68.248444.

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50

Posth, J. A., T. Schäfer, E. W. Laedke, and K. H. Spatschek. "Fast optimization procedures for third-order dispersion management." Optics Communications 219, no. 1-6 (April 2003): 241–49. http://dx.doi.org/10.1016/s0030-4018(03)01318-x.

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