Journal articles: 'Partial transfer absorption imaging'

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Seroka, Erin Marshall, Ana Valdés Curiel, Dimitrios Trypogeorgos, Nathan Lundblad, and Ian B. Spielman. "Repeated measurements with minimally destructive partial-transfer absorption imaging." Optics Express 27, no. 25 (December 2, 2019): 36611. http://dx.doi.org/10.1364/oe.27.036611.

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Ramanathan, Anand, Sérgio R. Muniz, Kevin C. Wright, Russell P. Anderson, William D. Phillips, Kristian Helmerson, and Gretchen K. Campbell. "Partial-transfer absorption imaging: A versatile technique for optimal imaging of ultracold gases." Review of Scientific Instruments 83, no. 8 (August 2012): 083119. http://dx.doi.org/10.1063/1.4747163.

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Park, Changyong, and Paul A. Fenter. "Phasing of resonant anomalous X-ray reflectivity spectra and direct Fourier synthesis of element-specific partial structures at buried interfaces." Journal of Applied Crystallography 40, no. 2 (March 12, 2007): 290–301. http://dx.doi.org/10.1107/s0021889806053131.

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A formalism for model-independent determination of element-specific partial structures at buried interfaces using the phase-dependent behavior of resonant anomalous X-ray reflectivity (RAXR) data is described. Each RAXR spectrum (i.e.reflectivityversusenergy at a fixed momentum transfer near the absorption edge of interest) is uniquely constrained by the amplitude and phase of the resonant partial structure factor with pre-determined non-resonant total structure factor and anomalous dispersion corrections of the resonant species. The element-specific partial density distribution is then imaged by discrete Fourier synthesis with the partial structure factor. The utility of this approach is demonstrated in the comparison of Rb+and Sr2+distributions at muscovite (001)–aqueous solution interfaces derived by model-independent and model-dependent approaches. This imaging method is useful for rapid determination of complex buried interfacial structures where element-specific atomic distributions are poorly constrained by conventional X-ray reflectivity analysis.

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Li, Liushuang, Ye Yuan, Jiawen Wu, Baohua Zhu, and Yuzong Gu. "The Third-Order Nonlinear Optical Properties of Sb2S3/RGO Nanocomposites." Photonics 9, no. 4 (March 23, 2022): 213. http://dx.doi.org/10.3390/photonics9040213.

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Antimony sulfide/reduced graphene oxide (Sb2S3/RGO) nanocomposites were synthesized via a facile, one-step solvothermal method. XRD, SEM, FTIR, and Raman spectroscopy were used to characterize the uniform distribution of Sb2S3 nanoparticles on the surface of graphene through partial chemical bonds. The third-order nonlinear optical (NLO) properties of Sb2S3, RGO, and Sb2S3/RGO samples were investigated by using the Z-scan technique under Nd:YAG picosecond pulsed laser at 532 nm. The results showed that pure Sb2S3 particles exhibited two-photon absorption (TPA), while the Sb2S3/RGO composites switched to variable saturated absorption (SA) properties due to the addition of different concentrations of graphene. Moreover, the third-order nonlinear susceptibilities of the composites were also tunable with the concentration of the graphene. The third-order nonlinear susceptibility of the Sb2S3/RGO sample can achieve 8.63 × 10−12 esu. The mechanism for these properties can be attributed to the change of the band gap and the formation of chemical bonds supplying channels for photo-induced charge transfer between Sb2S3 nanoparticles and the graphene. These tunable NLO properties of Sb2S3/RGO composites can be applicable to photonic devices such as Q-switches, mode-locking devices, and optical switches.

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5

Castañeda, Román. "Spatially partial coherence transfer and imaging." Journal of Modern Optics 46, no. 11 (September 1999): 1605–10. http://dx.doi.org/10.1080/09500349908231359.

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Castaneda, Roman. "Spatially partial coherence transfer and imaging." Journal of Modern Optics 46, no. 11 (September 15, 1999): 1605–10. http://dx.doi.org/10.1080/095003499148864.

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Pongayi Ponnusamy Selvi and Rajoo Baskar, Pongayi Ponnusamy Selvi and Rajoo Baskar. "Mass Transfer Enhancement for CO2 Absorption in Structured Packed Absorption Column." Journal of the chemical society of pakistan 41, no. 5 (2019): 820. http://dx.doi.org/10.52568/000803/jcsp/41.05.2019.

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The acidic gas, Carbon dioxide (CO2) absorption in aqueous ammonia solvent was carried as an example for industrial gaseous treatment. The packed column was provided with a novel structured BX-DX packing material. The overall mass transfer coefficient was calculated from the absorption efficiency of the various runs. Due to the high solubility of CO2, mass transfer was shown to be mainly controlled by gas side transfer rates. The effects of different operating parameters on KGav including CO2 partial pressure, total gas flow rates, volume flow rate of aqueous ammonia solution, aqueous ammonia concentration, and reaction temperature were investigated. For a particular system and operating conditions structured packing provides higher mass transfer coefficient than that of commercial random packing.

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Norton, Valerie A., and Daniel P. Weitekamp. "Communication: Partial polarization transfer for single-scan spectroscopy and imaging." Journal of Chemical Physics 135, no. 14 (October 14, 2011): 141107. http://dx.doi.org/10.1063/1.3652965.

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Tang, Chun Li, and Qian Wang. "The Pressure Differential Analysis of LiCl Solution Absorption Process." Advanced Materials Research 732-733 (August 2013): 541–47. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.541.

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To improve indoor air quality, mass transfer is an important part in air handling process, which is helpful for the control of humidity of air. This paper presents mass transfer dynamic analysis of isothermal and opposite flow process theoretically. The pressure difference analysis is used to show the changing of pressures of two phases in dehumidification process. It calculates the partial pressure of water vapor in wet air and the vapor pressure of LiCl solution. Also it gives the curves of pressure change in dehumidification of isothermal and opposite flow by lithium chloride. Results from this paper can be used as theoretical foundation for the experimental design of dehumidification of air by LiCl solution.

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Sufyan, Abu, Yani Rohmayani, Tubagus Chaeru Nugraha, and Mohammed H. Al-Khresheh. "INTERFERENCE IN THE DEVELOPMENT OF ARABIC VOCABULARY (A MORPHOLOGICAL REVIEW)." Humanities & Social Sciences Reviews 8, no. 4 (September 26, 2020): 1319–29. http://dx.doi.org/10.18510/hssr.2020.84124.

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Purpose: This study aims to describe the forms of Arabic language interference on terminologies in the domains of science, technology, and art. Methodology: The study was conducted morphophonologically using descriptive-analytical research methods. The descriptive-analytic research method was used to facilitate the achievement of goals specified in this study. The data findings were reviewed using the distributional method. Main Findings: The study found that language interference is an aspect of vocabulary development and enrichment, which requires harmonization of speech sounds. The results showed that in the Arabic language, interference produced partial absorption and full absorption. Phonologically, partial absorption occurred through the absorption of sound elements at the beginning or end of a word. Applications: Understanding the issue of language transfer in the development of Arabic vocabulary is useful for non- native Arabic speakers. The findings can also help Arabic teachers revise their teachings methods accordingly. Novelty/Originality of this study: This study contributed to a better understanding of the forms of phonological interference of foreign languages into the Arabic language. These forms can be represented as partial absorption, total absorption, and sound change. While in morphological forms, interference causes different developments of word patterns from classical Arabic.

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11

Bhandari, A., and R. K. Pavan Kumar Pannala. "Optimization of Heat Transfer Properties of Nanofluid Flow Over a Shrinking Surface Through Mathematical Modeling." International Journal of Applied Mechanics and Engineering 25, no. 2 (June 1, 2020): 40–56. http://dx.doi.org/10.2478/ijame-2020-0019.

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AbstractIn the current study, a three dimensional incompressible magnetohydrodynamic (MHD) nanofluid flow over a shrinking surface with associated thermal buoyancy, thermal radiation, and heating absorption effects, as well as viscous dissipation have been investigated. The model has been represented in a set of partial differential equations and is transformed using suitable similarity transformations which are then solved by using the finite element method through COMSOL. The results for velocity and temperature profiles are provided for various values of the shrinking parameter, Biot’s number, heat generation/absorption parameter, thermal Grashof number, nanoparticle volume fraction, permeability parameter, magnetic parameter and radiation parameter.

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Ghaemi, Ahad. "Mass transfer and thermodynamic modeling of carbon dioxide absorption into MEA aqueous solution." Polish Journal of Chemical Technology 19, no. 3 (September 1, 2017): 75–82. http://dx.doi.org/10.1515/pjct-2017-0052.

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Abstract In this research, thermodynamic and absorption rate of carbon dioxide in monoethanolamine (MEA) solution was investigated. A correlation based on both liquid and a gas phase variable for carbon dioxide absorption rate was presented using the π-Buckingham theorem. The correlation was constructed based on dimensionless numbers, including carbon dioxide loading, carbon dioxide partial pressure, film parameter and the ratio of liquid phase film thickness and gas phase film thickness. The film parameter is used to apply the effect of chemical reactions on absorption rate. A thermodynamic model based on the extended-UNIQUAC equations for the activity coefficients coupled with the Virial equation of state for representing the non-ideality of the vapor phase was used to predict the CO2 solubility in the CO2-MEA-H2O system. The average absolute error of the results for the correlation was 6.4%, which indicates the accuracy of the proposed correlation.

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Edström, Per, Magnus Neuman, and Ludovic G. Coppel. "A partial explanation of the dependence between light scattering and light absorption in the Kubelka-Munk model." Nordic Pulp & Paper Research Journal 27, no. 2 (May 1, 2012): 426–30. http://dx.doi.org/10.3183/npprj-2012-27-02-p426-430.

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Abstract The Kubelka-Munk scattering and absorption coefficients of a set of paper samples are assessed using reflectance measurements in d/0 geometry. The coefficients display the widely studied dependence between light scattering and light absorption, since the light scattering coefficient decreases in regions of high absorption. It is shown using general radiative transfer theory that part of this dependence can be explained and eliminated by taking into account the geometry of the d/0 instrument and the single scattering anisotropy, thus capturing the angular variations of the light reflected from the samples. These findings allow the papermaker to better predict the reflectance from mixtures of pulps, fillers, dye, and FWA, and to better evaluate bleaching efforts.

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Grancini, Giulia, Dario Polli, Daniele Fazzi, Juan Cabanillas-Gonzalez, Giulio Cerullo, and Guglielmo Lanzani. "Transient Absorption Imaging of P3HT:PCBM Photovoltaic Blend: Evidence For Interfacial Charge Transfer State." Journal of Physical Chemistry Letters 2, no. 9 (April 20, 2011): 1099–105. http://dx.doi.org/10.1021/jz200389b.

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15

MacLellan, Christopher J., David Fuentes, Andrew M. Elliott, Jon Schwartz, John D. Hazle, and R. Jason Stafford. "Estimating nanoparticle optical absorption with magnetic resonance temperature imaging and bioheat transfer simulation." International Journal of Hyperthermia 30, no. 1 (December 18, 2013): 47–55. http://dx.doi.org/10.3109/02656736.2013.864424.

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Cao, Jian Da, and Xuan Run Wu. "Partial Correlation Analysis of Color Reflectance of Dynamic Moisture Transfer of Fabric and Static Physical Indicators of Fabric." Applied Mechanics and Materials 170-173 (May 2012): 2987–90. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2987.

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This article first selects the seven kinds of fabric to observe fabrics for cobalt chloride drying, moisture absorption color from blue to pink change processes, and in 0 minutes to 30 minutes seven time taking pictures of fabric. Photos of extracting the spectral photometry instrument of reflectance as the characteristic value, also measured the seven fabric static physics index, and then the reflectivity of fabric and static physical indexes of the partial correlation analysis. The results show that when Controlling the moisture content, partial correlation coefficient of the reflectivity and thermal resistance is the highest, about 0.916, the second is when the moisture vapor transmission control, partial correlation coefficient of the thickness and the reflectivity is 0.884; The moisture content and moisture vapor transmission rate, air rate and reflectivity also has certain relations, core suck height and reflectivity does not exist partial correlation relationship.

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17

Ho, Chii-Dong, Hsuan Chang, Yih-Hang Chen, Jun-Wei Lim, and Jing-Wei Liou. "Conjugated Mass Transfer of CO2 Absorption through Concentric Circular Gas–Liquid Membrane Contactors." Processes 9, no. 9 (September 3, 2021): 1580. http://dx.doi.org/10.3390/pr9091580.

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A new design of gas absorption that winds the permeable membrane onto an inner concentric tube to conduct a concentric circular gas–liquid membrane module has been studied theoretically in the fully developed region. An analytical formulation, referred to as conjugated Graetz problems, is developed to predict the concentration distribution and Sherwood numbers for the absorbent fluid flowing in the shell side and CO2/N2 gas mixture flowing in the tube side under various designs and operating parameters. The analytical solutions to the CO2 absorption efficiency were developed by using a two-dimensional mathematical modeling, and the resultant conjugated partial differential equations were solved analytically using the method of separation variables and eigen-function expansion in terms of power series. The predictions of CO2 absorption rate by using Monoethanolamide (MEA) solution in concentric circular membrane contactors under both concurrent- and countercurrent-flow operations are developed theoretically and confirmed with the experimental results. Consistency in both a good qualitative and quantitative sense is achieved between the theoretical predictions and experimental results. The advantage of the present mathematical treatment provides a concise expression for the chemical absorption of CO2 by MEA solution to calculate the absorption rate, absorption efficiency, and average Sherwood number. The concentration profiles with the mass-transfer Graetz number, inlet CO2 concentration, and both gas feed and absorbent flow rates are also emphasized. Both theoretical predictions and experimental results show that the device performance of the countercurrent-flow operation is better than that of the concurrent-flow device operation. The availability of such simplified expressions of the absorption rate and averaged Sherwood as developed directly from the analytical solutions is the value of the present study.

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Al-Sudani, Farah T. "Absorption of Carbon Dioxide into Aqueous Ammonia Solution using Blended Promoters (MEA, MEA+PZ, PZ+ArgK, MEA+ArgK)." Engineering and Technology Journal 38, no. 9A (September 25, 2020): 1359–72. http://dx.doi.org/10.30684/etj.v38i9a.876.

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Absorption of CO2 into promoted-NH3 solution utilize a packed column (1.25 m long, 0.05m inside diameter) was examined in the present work. The process performance of four different blended promoters monoethanolamine (MEA)+ piperazine (PZ), piperazine (PZ)+ potassium argininate (ArgK) and monoethanolamine +potassium argininate was compared with unpromoted-NH3 solution by evaluated the absorption rate (φ_(CO_2 )) and overall mass transfer coefficient (K_(G,CO_2.) a_v) over the operating ranges of the studied process variables (1-15Kpa initial partial pressure of CO2, 5-15 Liter/min gas flow rate, 0.25-0.85 Liter/min liquid flow rate). The results exhibit that the absorption behavior and efficiency can be enhanced by rising volumetric liquid ﬂow rate and initial CO2 partial pressure. However, the gas ﬂow rate should be kept at a suitable value on the controlling gas film. Furthermore, it has been observed that the (PZ+ArgK) promoter was the major species that can accelerate the absorption rate and reached almost 66.166% up to123.23% over that of the unpromoted-NH3 solution.

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Yoshida, Koei, Ryo Takahashi, Hiroyuki Torikai, and Akihiko Ito. "Effect of Gravity on Radiative Heat Feedback on Small-Scale Pool Fires Using the Radiative Absorption Model." Modern Applied Science 10, no. 10 (July 7, 2016): 150. http://dx.doi.org/10.5539/mas.v10n10p150.

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The flame characteristics of pool fires such as their height vary depending on gravity. To improve our understanding of the effects of gravity on flame characteristics, we experimentally investigated small-scale pool fires under conditions of normal to partial gravity; using the drop tower at Hirosaki University in Japan to obtain arbitrary partial gravity condition, which varied from 1 G to 0.55 G. We performed the measurement of the temperature distribution with a thermocouple and that of the flame shape with a digital camera. Based on these data, we estimated radiative heat feedback using our new model “The radiative absorption model”. It becomes easy to estimate radiative heat transfer using this model if flames have complicated shapes and time variability. From these analyses, we made clear that the radiative heat feedback of small-scale pool fires decreases under partial gravity environment.

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Malvandi, A., F. Hedayati, and G. Domairry. "Stagnation Point Flow of a Nanofluid toward an Exponentially Stretching Sheet with Nonuniform Heat Generation/Absorption." Journal of Thermodynamics 2013 (August 18, 2013): 1–12. http://dx.doi.org/10.1155/2013/764827.

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This paper deals with the steady two-dimensional stagnation point flow of nanofluid toward an exponentially stretching sheet with nonuniform heat generation/absorption. The employed model for nanofluid includes two-component four-equation nonhomogeneous equilibrium model that incorporates the effects of Brownian diffusion and thermophoresis simultaneously. The basic partial boundary layer equations have been reduced to a two-point boundary value problem via similarity variables and solved analytically via HAM. Effects of governing parameters such as heat generation/absorption λ, stretching parameter ε, thermophoresis , Lewis number Le, Brownian motion , and Prandtl number Pr on heat transfer and concentration rates are investigated. The obtained results indicate that in contrast with heat transfer rate, concentration rate is very sensitive to the abovementioned parameters. Also, in the case of heat generation , despite concentration rate, heat transfer rate decreases. Moreover, increasing in stretching parameter leads to a gentle rise in both heat transfer and concentration rates.

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Rajiman, Viga, Hairul Nazirah Abdul Halim, Azmi Mohd Shariff, Muhammad Zubair Shahid, Abdulhalim Shah Maulud, Kok Keong Lau, and Lian See Tan. "CO2 Absorption from Biogas Using Piperazine-Promoted 2-Amino-2-methyl-1-propanol: Process Performance in a Packed Column." Sustainability 14, no. 12 (June 9, 2022): 7095. http://dx.doi.org/10.3390/su14127095.

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In this work, CO2 absorption from simulated biogas is investigated using different blends of a PZ + AMP solution in an absorption system at CO2 partial pressures ranging between 20 and 110 kPa. The collected data were presented as CO2 removal profiles along the packed column and were evaluated in terms of CO2 removal efficiency (%) and average overall volumetric mass transfer coefficient in the gas phase (KGav¯). An increased PZ concentration in the AMP solution was found to significantly increase the CO2 removal efficiency and KGav¯ values. It was observed that, when conducted at different CO2 partial pressures, gas and liquid flow rates, and chemical concentrations, the Lamine/GCO2 ratio strongly influenced the process behaviour in the packed column. Additionally, the optimal inlet liquid temperature was observed to be 35 ± 2 °C in this study.

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Zhang, Hongmei, and Michael F. Modest. "Scalable Multi-Group Full-Spectrum Correlated-k Distributions for Radiative Transfer Calculations." Journal of Heat Transfer 125, no. 3 (May 20, 2003): 454–61. http://dx.doi.org/10.1115/1.1560156.

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A new full-spectrum k-distribution method has been developed, in which spectral locations are sorted into M spectral groups, according to their absorption coefficient dependence on (partial) pressure and temperature. Calculating correlated-k full-spectrum k-distributions for each of the M groups, LBL accuracy can be obtained with M⩽32. Database values have been assembled for CO2 mixtures at atmospheric pressure. The method is fully scalable, i.e., spectral groups from the database can be combined to obtain coarser group models M=1,2,4,… for greater numerical efficiency (accompanied by slight loss in accuracy).

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Sattarivand, Mike, Maggie Kusano, Ian Poon, and Curtis Caldwell. "Symmetric geometric transfer matrix partial volume correction for PET imaging: principle, validation and robustness." Physics in Medicine and Biology 57, no. 21 (October 10, 2012): 7101–16. http://dx.doi.org/10.1088/0031-9155/57/21/7101.

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PARK, CHAN WOO, DA YOUNG YOU, HYOUNG JIN KIM, and IK-TAE IM. "PERFORMANCE ANALYSIS FOR THE CHARACTERISTICS OF DOUBLE/SINGLE EFFECT HYBRID TYPE ABSORPTION CHILLER." International Journal of Air-Conditioning and Refrigeration 18, no. 01 (March 2010): 23–29. http://dx.doi.org/10.1142/s2010132510000046.

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In this study, the characteristics of the hybrid type absorption chiller, combined with the single effect absorption chiller and the double effect absorption chiller, are numerically studied to use waste hot water effectively. In the case of the full load for hybrid type absorption system, the concentration and temperature of LiBr solution increase about 2.2°C and 0.7%, respectively, at the single effect generator by the hot water. As the partial load decreases, the COP decreasing ratio of the hybrid type absorption chiller is higher than that of the double effect absorption chiller. On the other hand, COP f shows the opposite result of COP. The cycle COP of the hybrid type is about 1.07 on the full load which is 0.11 lower than that of the conventional double effect type. But COP f of the hybrid type is 1.28 which is 0.22 larger than that of double effect type. In the case of 50% partial load, COP f of the hybrid type is 2.66 and at below 50% partial load, system can be operated without any fuels. As the temperature of hot water and the mass flow ratio of hot water increase, the fuel saving ratio increases. The effect of the inlet temperature on the COP and COP f is much more significant than that of the mass flow rate of the hot water.

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Yang, Wenge, Yijin Liu, Junyue Wang, Wendy Mao, and Ho-kwang Mao. "In-situ nanoscale imaging of charge transfer of BiNiO3 under high pressure." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C403. http://dx.doi.org/10.1107/s2053273314095965.

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Over last decades, both synchrotron radiation techniques and high pressure research have made great progress. Advanced synchrotron capabilities with high spatial resolution, high flux, and high energy resolution provides us many new avenues to conduct advanced high pressure researches. In this talk, we will focus on the new developments of the nanoscale imaging techniques on the pressure induced phase separation in three dimensions. BiNiO3 under goes a charge transfer induced phase transition under high pressure or temperature, which shows excellent colossal negative thermal expansion effect [1]. Co-exist of both high density and low density phases over a wide range pressure or temperature plays the key roles on the negative thermal expansion behavior. We utilized a newly developed X-ray absorption near edge spectroscopy tomography method, and successfully resolved the mixture of high/low pressure phases as a function of pressure at tens of nanometer resolution. By choosing incident x-ray energy near Ni absorption edge, the pressure induced valence transition can be mapped at tens of nanometer scale in 3d, which provides crucial information on the HP-LP phase boundary [2]. As temperature driven grain growth upon heating, we can draw fundamental information on the pressure-induced phase growth mechanism.

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Abo-Eldahab, Emad M., and Mohamed A. El Aziz. "Hydromagnetic three-dimensional free convective heat transfer overa stretching surface embedded in a non-Darcian porous medium inthe presence of heat generation or absorption." Canadian Journal of Physics 83, no. 7 (July 1, 2005): 739–51. http://dx.doi.org/10.1139/p05-022.

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A general analysis is developed to study fluid-flow and heat-transfer characteristics for steady, three-dimensional flow over a linearly stretching porous vertical surface embedded in a non-Darcian medium. A generalized flow model is used in the present study to include the effects of the macroscopic viscous term and the microscopic inertial force. The flow is subjected to a uniform transverse magnetic field normal to the plate. The effect of internal heat generation or absorption is also considered. The governing three-dimensional partial-differential equations for the present case are transformed into ordinary-differential equations using three-dimensional similarity variables. The resulting equations are solved numerically. Velocity distribution, temperature distribution, surface shear stresses, and wall-heat transfer rate are computed for various values of the Prandtl number, magnetic field parameter, inverse Darcy number, porous-medium inertia coefficient, heat generation/absorption coefficient, and mass-transfer coefficient.PACS No.: 44.30.+v

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Liu, Ke, Honggang Chang, Gang Xiong, Jinlong He, Qisong Liu, and Jinjin Li. "Modeling CO2, H2S, COS, and CH3SH Simultaneous Removal Using Aqueous Sulfolane–MDEA Solution." Processes 9, no. 11 (October 31, 2021): 1954. http://dx.doi.org/10.3390/pr9111954.

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In this study, a rate-based absorption model coupled with an improved thermodynamic model was developed to characterize the removal of acid components (CO2 and H2S) and organic sulfur (COS and CH3SH) from natural gas with an aqueous sulfolane–MDEA solution. First, the accuracy of the thermodynamic model was validated by comparing the calculated partial pressure of CO2, H2S, and CH3SH with those of the experimental data reported in the literature. Then, the industrial test data were employed to validate the absorption model and the simulation results agreed well with the experimental data. The average relative errors of the removal rates of CO2, COS, and CH3SH are 3.3%, 3.0%, 4.1%, respectively. Based on the validated coupled model, the total mass transfer coefficient and mass transfer resistance of each solute component at different column positions were analyzed. The effects of the gas–liquid ratio, overflow weir height, and absorption pressure on the absorption performance of each component were studied, and the influence of the acid component concentration in the feed gas on the removal efficiency of methyl mercaptan (CH3SH) was also discussed. It is found that the improved absorption model can better characterize the absorption performance and be conducive to the optimal design of the absorber column.

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Kumar, P. Veera Sanjeeva, and L. Rama Mohan Reddy. "MHD FLOW PAST A VERTICAL PLATE OF CASSON FLUID WITH HEAT AND MASS TRANSFER EFFECTS." South East Asian J. of Mathematics and Mathematical Sciences 18, no. 02 (September 26, 2022): 369–78. http://dx.doi.org/10.56827/seajmms.2022.1802.30.

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The mode of heat transfer will play an important role in the heat engineering applications. The present work is focused on analytical investigation of unsteady heat and mass transfer rate through porous medium in the presence of uniform transverse magnetic field along with radiation/absorption, heat generation/ absorption and homogeneous chemical reaction effects. The coupled nonlinear partial equations into ordinary differential equations by perturbation method. The effects of various parameters on flow characteristics are investigated .The results are presented through various graphs which are plotted for the effect of different parameters on fluid flow. Impact of Casson parameter leads to decrease the fluid velocity. The heavier species with low conductivity reduces the flow within the boundary layer.The Casson parameter is taken due to the significance of nonNewtonian fluids in real time applications in chemical industries and petroleum refineries.

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Parveen, N., and M. A. Alim. "MHD NATURAL CONVECTION FLOW ALONG A VERTICAL WAVY SURFACE IN PRESENCE OF HEAT GENERATION/ABSORPTION WITH VISCOSITY DEPENDENT ON TEMPERATURE." Journal of Mechanical Engineering 42, no. 1 (July 30, 2013): 47–55. http://dx.doi.org/10.3329/jme.v42i1.15944.

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The present numerical simulation is analyzed the Magnetohydrodynamic natural convection flow andheat transfer along a uniformly heated vertical wavy surface in presence of heat generation/absorption withtemperature dependent variable viscosity. Using the appropriate transformations the governing boundary layerequations are reduced to non-dimensional forms. The resulting nonlinear system of partial differentialequations are mapped into the domain of a vertical flat plate and then solved numerically applying implicitfinite difference method together with Keller-box scheme. The solutions are expressed in terms of the skinfriction coefficient, the rate of heat transfer, the streamlines as well as the isotherms over the whole boundarylayer. The implications of heat generation/absorption parameter (Q) and viscosity parameter (?) on the flowstructure and heat transfer characteristics are investigated in detail while, Prandtl number (Pr), magneticparameter (M) and the amplitude-to-length ratio of the wavy surface (?) are considered fixed. Comparison withpreviously published work is performed and is found to be in good agreement.DOI: http://dx.doi.org/10.3329/jme.v42i1.15944

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Akanji, Olaitan L., and Andrei V. Kolesnikov. "Modeling of heat and mass transfer in LaNi5 matrix during hydrogen absorption-desorption cycle." Polish Journal of Chemical Technology 14, no. 3 (October 1, 2012): 71–76. http://dx.doi.org/10.2478/v10026-012-0087-0.

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Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen storage systems. Some operational and design variables are major constraints to obtain a proper infl ow/outfl ow of hydrogen into a metal hydride reactor. These variables include packed bed thermal conductivity, porosity, pressure and temperature distributions in the reactor during the absorption/desorption cycle. They also cause a mechanical stress induced by temperature gradient. In this paper, two dimensional models are implemented in COMSOL multiphysics to simulate the hydrogen fl ow, pressure and temperature distributions in the packed bed reactor during absorption/desorption cycle. Also, stresses in porous metal hydride induced by temperature variation in the heating/cooling cycle were evaluated. A possible effect of stress induced, porosity changes on diffusion and heating of hydrogen in both radial and axial direction in packed bed is discussed. The model consists of a system of partial differential equations (PDE) describing structural mechanics of stress, heat and mass transfer of hydrogen in the porous matrix of the packed bed reactor.

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Hayat, Tanzila, S. Nadeem, and A. U. Khan. "Numerical analysis of Ag–CuO/water rotating hybrid nanofluid with heat generation and absorption." Canadian Journal of Physics 97, no. 6 (June 2019): 644–50. http://dx.doi.org/10.1139/cjp-2018-0011.

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The present work is committed to examining the impacts of magnetohydrodynamics (MHD), heat generation–absorption, and volume fraction of nanoparticles on the flow of hybrid nanofluid past a stretching surface. The comparison of heat transfer properties of rotating, conventional nanofluid with that of developing hybrid nanofluid is also studied. To examine the Lorentz force impacts on three-dimensional stretching surface, another model of “thermophysical properties” is used. The whole system, including nanofluid and stretching surface, is in rigid body rotation about an axis normal to the plane of the stretching surface with constant angular velocity. The system of governing nonlinear partial differential equations has been simplified by using suitable similarity transformations and then solved via an efficient numerical technique, BVP-4C. The velocity and local skin friction are obtained in both directions. The rate of heat transfer is determined on the surface. The effects of pertinent physical parameters, which are magnetic parameter, rotation parameter, stretching parameter, heat generation or absorption parameter, and Prandtl number, have been discussed through graphical and tabular form. From the present study, it is noticed that the rate of heat transfer of hybrid nanofluid is higher than that of ordinary nanofluid. In hybrid nanofluid, the required rate of heat transfer can be accomplished by picking distinctive and suitable nanoparticle extents.

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Nurul Amira Zainal, Kohilavani Naganthran, and Roslinda Nazar. "Unsteady MHD Rear Stagnation-Point Flow of a Hybrid Nanofluid with Heat Generation/Absorption Effect." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 87, no. 1 (September 7, 2021): 41–51. http://dx.doi.org/10.37934/arfmts.87.1.4151.

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The study of unsteady flow is essential in various engineering systems, for instance, the periodic fluid motion and start-up process. Therefore, this numerical study focuses on examining the unsteady magnetohydrodynamics (MHD) rear stagnation-point flow in Al2O3-Cu/H2O hybrid nanofluid past a permeable stretching/shrinking surface with the impact of heat generation/absorption. By choosing a suitable similarity transformation, partial differential equations are transformed into a system of nonlinear ordinary differential equations and solved using the bvp4c function in the MATLAB package. The effects of the solution domain’s operating parameters are analysed, and dual solutions are observable as the sheet shrinks. It is found that the addition of the suction parameter escalates the heat transfer efficiency. Eventually, the existence of the unsteadiness parameter and the heat generation/absorption effect significantly encourage heat transfer deterioration.

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Brown, P. N., P. C. Jackson, G. E. Staddon, R. B. Richardson, and H. B. Griffith. "Compartmental analysis of cerebrospinal fluid transfer and absorption in simulated hydrocephalus." Physics in Medicine and Biology 30, no. 10 (October 1, 1985): 1113–21. http://dx.doi.org/10.1088/0031-9155/30/10/010.

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Liu, I.-C. "Exact Solutions for a Fluid-Saturated Porous Medium with Heat and Mass Transfer." Journal of Mechanics 21, no. 1 (March 2005): 57–62. http://dx.doi.org/10.1017/s1727719100000551.

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AbstractAn analysis is performed to the study of the momentum, heat and mass transfer of a viscous fluid-saturated porous medium past an impermeable, non-isothermal stretching sheet with internal heat generation or absorption and chemical reaction. The governing partial differential equations are converted into ordinary differential equations by means of a similarity transformation. Exact solutions of velocity components together with the pressure distribution, which can not be found in the boundary layer theory, are obtained analytically; in addition, the temperature and concentration functions are given in terms of confluent hypergeometric functions. The velocity, temperature (concentration) profiles and thermal characteristics at the sheet for relevant parameters are plotted, tabulated and discussed.

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WANG, XIAO-PING, HUAI-NA YU, and TONG-SHENG CHEN. "QUANTITATIVE FRET MEASUREMENT BASED ON CONFOCAL MICROSCOPY IMAGING AND PARTIAL ACCEPTOR PHOTOBLEACHING." Journal of Innovative Optical Health Sciences 05, no. 03 (July 2012): 1250015. http://dx.doi.org/10.1142/s1793545812500150.

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Fluorescence resonance energy transfer (FRET) technology had been widely used to study protein–protein interactions in living cells. In this study, we developed a ROI-PbFRET method to real-time quantitate the FRET efficiency of FRET construct in living cells by combining the region of interest (ROI) function of confocal microscope and partial acceptor photobleaching. We validated the ROI-PbFRET method using GFPs-based FRET constructs including 18AA and SCAT3, and used it to quantitatively monitor the dynamics of caspase-3 activation in single live cells stably expressing SCAT3 during staurosporine (STS)-induced apoptosis. Our results for the first demonstrate that ROI-PbFRET method is a powerful potential tool for detecting the dynamics of molecular interactions in live cells.

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Ho, Chii-Dong, Luke Chen, Chien-Chang Huang, Chien-Hua Chen, Thiam Leng Chew, and Yu-Han Chen. "Two-Dimensional Conjugated Mass Transfer of Carbon Dioxide Absorption in a Hollow-Fiber Gas-Liquid Membrane Contactor." Membranes 12, no. 10 (October 20, 2022): 1021. http://dx.doi.org/10.3390/membranes12101021.

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The absorption efficiencies of CO2 in hollow-fiber membrane contactors using an ethanolamine (MEA) solvent under both concurrent- and countercurrent-flow operations were investigated theoretically and experimentally. Two-dimensional mathematical modeling was developed by Happel’s free surface model, and the resultant partial differential equations were solved analytically using the separated variables method with the use of an orthogonal expansion technique. A simplified expression of Sherwood number variations was reported by employing the relevant operations conditions and expressed in terms of the computed eigenvalues for predicting concentration distribution and absorption efficiency. It is emphasized that, in comparing various fiber packing configurations, both theoretical predictions and experimental results should be compared to find the absorption flux increment accomplished by the CO2/N2 stream passing through the fiber cells under the same mass flow rate. The value of the present mathematical treatment is evident to propose a simplified expression of the averaged Sherwood number variations, and provides the predictions of the absorption flux, absorption efficiency, average Sherwood number with the absorbent Graetz number, inlet CO2 concentration, and absorbent flow rates as parameters. The availability of such concise expressions, as developed directly from the analytical formulations, is the value of the present study. The experiments of the CO2 absorption using MEA with alumina (Al2O3) hollow fiber membranes are also set up to confirm the accuracy of the theoretical predictions. The accuracy derivations between the experimental results and theoretical predictions for concurrent- and countercurrent-flow operations are 4.10×10−2≤E≤1.50×10−2 and 1.40×10−2≤E≤9.0×10−1, respectively. The operations of the hollow-fiber membrane contactor implementing N = 7 fiber cells and N = 19 fiber cells offer an inexpensive method of improving absorption efficiency by increasing fiber numbers with consideration of device performance.

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Pavithra, G. M., and B. J. Gireesha. "Effect of Internal Heat Generation/Absorption on Dusty Fluid Flow over an Exponentially Stretching Sheet with Viscous Dissipation." Journal of Mathematics 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/583615.

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A numerical analysis has been carried out to describe the boundary layer flow and heat transfer of a dusty fluid over an exponentially stretching surface in the presence of viscous dissipation and internal heat generation/absorption. The governing partial differential equations are reduced to nonlinear ordinary differential equations by a similarity transformation, before being solved numerically by Runge-Kutta-Fehlberg 45 method. The heat transfer analysis has been carried out for both PEST and PEHF cases. The numerical results are compared with the earlier study and found to be in excellent agreement. Some important features of the flow and heat transfer in terms of velocities and temperature distributions for different values of the governing parameters like fluid-particle interaction parameter, Prandtl number, Eckert number, Number density, heat source/sink parameter, and suction parameter which are of physical and engineering interests are analyzed, discussed, and presented through tables and graphs.

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Burger, T., H. J. Ploss, J. Kuhn, S. Ebel, and J. Fricke. "Diffuse Reflectance and Transmittance Spectroscopy for the Quantitative Determination of Scattering and Absorption Coefficients in Quantitative Powder Analysis." Applied Spectroscopy 51, no. 9 (September 1997): 1323–29. http://dx.doi.org/10.1366/0003702971941999.

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A three-flux approximation of the equation of radiative transfer is used to separately determine the effective specific scattering and absorption coefficients of powder mixtures from hemispherical reflectance and transmittance measurements. For a two-component mixture of lactose and paracetamol, it is demonstrated how the knowledge of the separately known scattering coefficient can be used to improve partial least-squares regression (PLS) calibrations of diffuse reflectance data pretreated by multiplicative scatter correction (MSC). Furthermore it is shown that the measured specific absorption coefficient of the investigated mixtures is not generally a linear function of the constituents concentration, a result which might be caused by the mixing procedure of the samples. With the use of the absorption coefficient, it is demonstrated that artificial neural networks are superior to PLS calibrations when modeling a nonlinear relation.

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Palacios, Rodrigo E., Stephanie L. Gould, Christian Herrero, Michael Hambourger, Alicia Brune, Gerdenis Kodis, Paul A. Liddell, et al. "Bioinspired energy conversion." Pure and Applied Chemistry 77, no. 6 (January 1, 2005): 1001–8. http://dx.doi.org/10.1351/pac200577061001.

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Artificial photosynthetic antenna systems have been synthesized based on carotenoid polyenes and polymer-polyenes covalently attached to tetrapyrroles. Absorption of light in the blue/green region of the spectra excites the polyenes to their S2 state, and ultrafast singlet energy transfer to the tetrapyrroles occurs when the chromophores are in partial conjugation. The additional participation of other excited states of the polyene in the energy-transfer process is a requirement for perfect antenna function. Analogs of photosynthetic reaction centers consisting of tetrapyrrole chromophores covalently linked to electron acceptors and donors have been prepared. Excitation of these constructs results in a cascade of energy transfer/electron transfer which, in selected cases, forms a final charge-separated state characterized by a giant dipole moment (>150 D), a quantum yield approaching unity, a significant fraction of the photon energy stored as chemical potential, and a lifetime sufficient for reaction with secondary electron donors and acceptors. A new antenna-reaction center complex is described in which a carotenoid moiety is located in partial conjugation with the tetrapyrrole π-system allowing fast energy transfer (<100 fs) between the chromophores. In this assembly, the energy transduction process can be initiated by light absorbed by the polyene.

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Begani Provinciali, Ginevra, Alessia Cedola, Ombeline de La Rochefoucauld, and Philippe Zeitoun. "Modelling of Phase Contrast Imaging with X-ray Wavefront Sensor and Partial Coherence Beams." Sensors 20, no. 22 (November 12, 2020): 6469. http://dx.doi.org/10.3390/s20226469.

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The Hartmann wavefront sensor is able to measure, separately and in absolute, the real δ and imaginary part β of the X-ray refractive index. While combined with tomographic setup, the Hartman sensor opens many interesting opportunities behind the direct measurement of the material density. In order to handle the different ways of using an X-ray wavefront sensor in imaging, we developed a 3D wave propagation model based on Fresnel propagator. The model can manage any degree of spatial coherence of the source, thus enabling us to model experiments accurately using tabletop, synchrotron or X-ray free-electron lasers. Beam divergence is described in a physical manner consistent with the spatial coherence. Since the Hartmann sensor can detect phase and absorption variation with high sensitivity, a precise simulation tool is thus needed to optimize the experimental parameters. Examples are displayed.

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Mat Noor, Nur Azlina, Sharidan Shafie, and Mohd Ariff Admon. "Unsteady MHD Flow of Cassonnano Fluid with Chemical Reaction, Thermal Radiation and Heat Generation/Absorption." MATEMATIKA 35, no. 4 (December 31, 2019): 33–52. http://dx.doi.org/10.11113/matematika.v35.n4.1262.

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The hydromagnetic mixed convection flow of Cassonnano fluid under the influence of chemical reaction,thermal radiation and heat generation or absorption is investigated. The flow is induced due to unsteady nonlinearly stretching sheet saturated in a porous medium. The governing nonlinear coupled partial differential equations are converted into the system of coupled ordinary differential equations using similarity transformations and then solved numerically via Keller box method. The effects of pertinent parameters on velocity, temperature and nanoparticles concentration as well as wall shear stress, heat and mass transfer rate are analyzed and displayed graphically. The results for skin friction coefficient and local Nusselt number are compared with previously published work and found to be in good agreement. Findings demonstrate that increase in Casson parameter enhanced the friction factor and heat transfer rate. It is noticed that the heat transfer rate is declined with increment in Brownian motion and thermophoresis parameters. The nanoparticles concentration is seen to be higherin generative chemical reaction and opposite effect is observed in destructive chemical reaction. Increase in unsteadiness parameter decreased the fluid velocity, temperature and nanoparticles concentration. The magnitude of wall shear stress is also reduced with increase in unsteadiness and porous medium parameters.

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Pérez, M., O. I. Abbate, J. Lipovetzky, F. Alcalde Bessia, F. A. Sánchez, M. Sofo Haro, J. Longhino, M. Gómez Berisso, and J. J. Blostein. "Neutron imaging based on transfer foil activation and COTS CMOS image sensors." Journal of Instrumentation 17, no. 02 (February 1, 2022): P02004. http://dx.doi.org/10.1088/1748-0221/17/02/p02004.

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Abstract In this paper we present a method for obtention of neutron images with Commercial-Off-The-Shelf (COTS) CMOS image sensors through the activation of indium foils. This detection method has been designed specifically for the acquisition of thermal and epitermal neutron images in mixed beams with a high gamma flux, and also for the study of high radioactive samples that are usually placed into research reactor pools. We also present a technique to obtain multi-spectral neutron images taking advantage of the high neutron absorption cross-section of this material in the thermal energy range, as well as around the 1.45 eV resonance. Measurements performed in a neutron beam of the RA6 nuclear research reactor located in Bariloche, Argentina, confirm the capability of the proposed technique.

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Abdul Muiz Mohd Zaki, Nurul Farahain Mohammad, Siti Khuzaimah Soid, Muhammad Khairul Anuar Mohamed, and Rahimah Jusoh. "Effects of Heat Generation/Absorption on a Stagnation Point Flow Past a Stretching Sheet Carbon Nanotube Water-Based Hybrid Nanofluid with Newtonian Heating." Malaysian Journal of Applied Sciences 6, no. 2 (October 31, 2021): 34–47. http://dx.doi.org/10.37231/myjas.2021.6.2.297.

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This study investigates the mathematical modelling of heat generation/absorption effect on the convective flow of single wall carbon nanotube-copper (SWCNT-Cu)/water hybrid nanofluid towards a stagnation point past a stretching sheet with Newtonian heating. The set of governing equations in the form of non-linear partial differential equations are first transform using the similarity transformation technique then solved numerically by the Runge-Kutta-Fehlberg (RKF45) method in Maple software. The numerical solutions were obtained for the surface temperature, the heat transfer coefficient and the skin friction coefficient as well as the velocity and the temperature profiles. The features of the flow and heat transfer characteristics for various values of the stretching parameter, the conjugate parameter, the nanoparticle volume fraction parameter and the heat source/sink parameter are analyzed and discussed. It is found that effects of hybrid nanoparticles are more significant for lower stretching parameter and for large conjugate parameter values, as well as the heat generation/absorption.

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Bhattacharyya, Krishnendu, and G. C. Layek. "Thermal Boundary Layer in Flow due to an Exponentially Stretching Surface with an Exponentially Moving Free Stream." Modelling and Simulation in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/785049.

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A numerical investigation is made to study the thermal boundary layer for flow of incompressible Newtonian fluid over an exponentially stretching sheet with an exponentially moving free stream. The governing partial differential equations are transformed into self-similar ordinary differential equations using similarity transformations in exponential forms. Then those are solved numerically by shooting technique using Runge-Kutta method. The study reveals that the momentum boundary layer thickness for this flow is considerably smaller than the linear stagnation point flow past a linearly stretching sheet. The momentum and thermal boundary layer thicknesses reduce when the velocity ratio parameter increases. For the temperature distribution, in addition to the heat transfer from the sheet, the heat absorption at the sheet also occurs in certain situations and both heat transfer and absorption increase with the velocity ratio parameter and the Prandtl number. The temperature inside the boundary layer significantly decreases with higher values of velocity ratio parameter and the Prandtl number.

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Ibrahim, Wubshet, and Gosa Gadisa. "Finite Element Method Solution of Boundary Layer Flow of Powell-Eyring Nanofluid over a Nonlinear Stretching Surface." Journal of Applied Mathematics 2019 (July 4, 2019): 1–16. http://dx.doi.org/10.1155/2019/3472518.

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The nonlinear convective flow of Eyring-Powell nanofluid using Catteneo-Christov model with heat generation or absorption term and chemical reaction rate over nonlinear stretching surface is analyzed. The simultaneous nonlinear partial differential equations governing the boundary layer flow are transformed to the corresponding nonlinear ordinary differential equations using similarity solution and then solved using Galerkin finite element method (GFEM). The impacts of pertinent governing parameters like Brownian diffusion, thermophoresis, mixed convection, heat generation or absorption, chemical reaction rate, Deborah numbers, Prandtl number, magnetic field parameter, Lewis number, nonlinear stretching sheet, and Eyring-Powell fluid parameters on velocity field, temperature, and nanoparticle concentration are given in both figures and tabular form. The result shows that the rise in chemical reaction rate will improve mass transfer rate and reduce heat transfer rate and local buoyancy parameter has quit opposite effect. The attributes of local skin friction coefficient, Nusselt number, and Sheer wood number are investigated and validated with existing literatures.

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Wu, Jie, Jia Bi Chen, and Xue Long Zhang. "X Ray Phase Contrast Imaging for the Extreme Low Density or Weak Absorption Materials." Advanced Materials Research 366 (October 2011): 322–25. http://dx.doi.org/10.4028/www.scientific.net/amr.366.322.

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In order to get better images from the extreme low density or weak absorption materials, a new modulation transfer function model is established for the X ray phase contrast imaging. Then the parameter effects of ray source size are elaborated on the basis of the partially coherent optical theory. From the simulation and calculation, the proposal and parameter optimization are revealed according to the actual materials experiment conditions.

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Ar’ev, I. A., N. I. Lebovka, and E. A. Solovieva. "Effects of partial charge-transfer solute – solvent interactions in absorption spectra of aromatic hydrocarbons in aqueous and alcoholic solutions." Molecular Physics 111, no. 20 (October 31, 2013): 3077–80. http://dx.doi.org/10.1080/00268976.2013.770175.

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Fumey, Benjamin, Andreas Borgschulte, Sascha Stoller, Reto Fricker, Ralf Knechtle, Anders Kaestner, Pavel Trtik, and Luca Baldini. "Enhanced gas-liquid absorption through natural convection studied by neutron imaging." International Journal of Heat and Mass Transfer 182 (January 2022): 121967. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121967.

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P, Chinna Ayya Swamy, and Pakkirisamy Thilagar. "Multiple emissive triarylborane-A2H2 and triarylborane-Zn-A2H2 porphyrin conjugates." Dalton Transactions 45, no. 11 (2016): 4688–96. http://dx.doi.org/10.1039/c5dt02678d.

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The rational design and synthesis of triarylborane-A₂H₂ (1) and triarylborane-Zn-A₂H₂ porphyrins (2) have been reported. Compounds 1 and 2 showed multiple emission bands upon excitation at the triarylborane dominated absorption region (350 nm). The detailed optical and computational studies showed that the multiple emission features of 1 and 2 are because of a partial energy transfer from the donor (triarylborane) to the acceptor (porphyrin).

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Jain, S., and S. Bohra. "Entropy Generation on MHD Slip Flow Over a Stretching Cylinder with Heat Generation/Absorption." International Journal of Applied Mechanics and Engineering 23, no. 2 (May 1, 2018): 413–28. http://dx.doi.org/10.2478/ijame-2018-0024.

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Abstract In the present study, we have investigated entropy generation on a magnetohydrodynamic fluid flow and heat transfer over a stretching cylinder with a porous medium in slip flow regime. A uniform heat source and radiation is also considered. Similarity transformation has been applied for making an ordinary differential equation from nonlinear governing partial differential equations. The numerical solution for the set of nonlinear ordinary differential equations has been obtained by using the fourth-order Runge-Kutta scheme together with the shooting method. The effects of pertinent parameters such as the magnetic field parameter, permeability parameter, slip parameter, Prandtl number and radiation parameter on the fluid velocity distribution, temperature distribution, entropy generation and Bejan number are discussed graphically.

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Journal articles on the topic 'Partial transfer absorption imaging'

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