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Understanding the density of CO2 + n-decane is crucial for designing and operating CO2 capture, transport, and storage. The safety and effectiveness of CO2 burial is directly affected by the density of CO2 + n-decane mixtures. The liquid densities of CO2(1) + n-decane(2) mixtures with mole fractions of CO2 x1 = 0, 0.2032, 0.4434, 0.7589, and 0.8947 were measured using a vibrating tube densimeter. The combined expanded uncertainties of density with a level of confidence of 0.95 are estimated to be 0.6 kg·m−3. A total of 221 compressed liquid densities of CO2(1) + n-decane(2) mixtures along the five isotherms between T = (283 and 363) K with pressures up to 100 MPa were presented. The densities of mixtures were correlated by the modified Tait equation, resulting in absolute average deviations between the experimental and calculated values of 0.028%, 0.013%, 0.017%, 0.044%, and 0.042%. In addition, the isothermal compressibility, isobaric thermal expansivity, and excess molar volume were derived from the modified Tait equation. [ABSTRACT FROM AUTHOR]

Density, viscosity, refractive index, and ultrasonic velocity were measured for the pure materials anisole, methanol, and toluene, and for the binary mixtures: methanol—anisole and methanol—toluene. Excess molar volume VE, isobaric thermal compressibility α, excess Gibbs activation energy for fluid flow ΔGE*, and excess isentropic compressibility κSE were calculated from the measured quantities. For both binary mixtures VE and κSE were <0 while Δn > 0 and ΔGE* > 0 over the entire mole fraction composition range. Anisole mixtures exhibited more negative values for VE and κSE while more positive values were displayed for Δn and ΔGE* compared to toluene mixtures. For Δη, negative values were observed at low alcohol concentrations but positive values at high alcohol concentrations for both systems. [ABSTRACT FROM AUTHOR]

The high-pressure and high-temperature thermodynamic properties of rhodium (up to 2000 K and 300 GPa) are presented using the first principle approach within the quasi-harmonic approximation. The thermal Helmholtz free energy includes the contribution of both phonon vibrations and electronic excitations. The performance of three popular exchange-correlation functionals—local density approximation [Perdew et al., Phys. Rev. B 23, 5048 (1981)], Perdew–Burke–Ernzerhof generalized gradient approximation (PBE) [Perdew et al., Phys. Rev. Lett. 77, 3865 (1996)], PBE modified for dense solids [Perdew et al., Phys. Rev. Lett. 100, 136406 (2008)] are shown. The simulated thermal expansion coefficient, isobaric heat capacity, mode-Grüneisen parameter, thermodynamic average Grüneisen parameter, and bulk modulus are compared with the available experimental and theoretical reports. The contribution of thermal electronic excitations to the obtained thermodynamic parameters is significant at low pressure and high temperatures, except in bulk modulus, where it is small. The pressure-dependent elastic constant coefficient (Cij) and the Debye temperature are computed at 0 K. The Pugh ratio calculated from Cij indicates that rhodium undergoes brittle to ductile transitions at an average pressure of 7.45 GPa. [ABSTRACT FROM AUTHOR]

Featured Application: The research presented in this paper can be used to develop methods for determining optimal conditions for thermal and baric synthesis of materials. By the method of molecular dynamics, computer simulation of the processes of isobaric cooling of argon particle systems under initial conditions with a temperature of 150 K at pressure values from 0.1 to 4 MPa to a temperature of 40 K with cooling rates of 108, 109, 1010, 1011 and 1012 K/s was performed. As a result of a computer experiment, coordinate arrays of particles were obtained, which were subjected to the procedure of three-dimensional Voronoi partitioning to identify and calculate the number of elementary cells of the crystal structure. Analysis of the structure of argon solid phases formed during isobaric cooling allowed us to deduce an estimated pattern between the concentration of FCC (face-centered cubic) cells in solid argon and the cooling rate from the liquid state. The evaluation of the orientation of the axes of translation of crystal cells in the array of particle coordinates made it possible to classify the solid phases formed as a result of cooling as single crystals, glassy media with the inclusion of clusters and single cells of FCC structures. It was revealed that during isobaric cooling at a rate not exceeding 108 K/s, argon completely crystallizes, at isobaric cooling rates of 109–1010 K/s, the union of elementary cells of the crystal structure into clusters is observed in glassy argon, and at rates of 1011 K/s and higher at pressures of 1 MPa and lower, solid vitreous phases of argon are formed in which no crystal structure cells are detected. [ABSTRACT FROM AUTHOR]

Densities of pure furan, toluene, 1-octanol, n-hexane and of binary liquid mixtures containing furan, have been measured from 303.15 to 383.15 K at pressures up to 1.6 MPa, using a vibrating tube densimeter. Excess molar volumes have been calculated from the densities with an average standard uncertainty 0.02 cm3⋅mol−1. Excess molar enthalpies of the binary mixtures were measured at temperatures ranging from 313.15 to 383.15 K at 0.5 MPa and/or 1.0 MPa, using flow mixing calorimeter. The average standard uncertainty on the whole measurements is less than 1%. The excess molar properties derived from experimental data were correlated using Redlich–Kister polynomial functions and NRTL activity coefficient model and Prigogine–Flory–Patterson modelling is described and used to correlate the data. [ABSTRACT FROM AUTHOR]

The relevance of research into the thermophysical properties of lead is associated with the implementation of a BREST-300 reactor project. The enthalpy of solid and liquid lead in the range of 432–1327 K was measured by the mixing method using a massive isothermal calorimeter. The enthalpy of melting was determined. Approximation equations for the temperature dependence of enthalpy in the range of 298.15–1325 K were obtained to determine the isobaric heat capacity. The existence of a heat capacity minimum for liquid lead in the region of 830 K was established. An analysis of existing recommended and experimental data on the caloric properties of lead was performed. The need for new measurements of the enthalpy and heat capacity of a melt at temperatures above 1050 K is substantiated. [ABSTRACT FROM AUTHOR]

Accurate determination of the thermophysical properties of hydrogen is a crucial issue in hydrogen system design. By developing computational programs, a statistical thermodynamic model based on fundamental equations of state was implemented to determine hydrogen's thermophysical properties, including the ortho-hydrogen fraction in equilibrium hydrogen, para-ortho hydrogen conversion heat, isobaric heat capacities and enthalpies. The deviations of calculated para-hydrogen enthalpies from REFPROP data were within 2.22%, ranging from 20 K to 300 K at 0.1 MPa, and within 2.32% between 100 K and 1500 K at pressures from 0.1 MPa to 20 MPa. To quantitatively assess the convenience of the statistical thermodynamic method, the running speeds of programs with different methods for determining hydrogen's thermophysical properties were compared. The time required for statistical thermodynamic calculation was 7.95% that required for treading REFPROP data when the performance of the variable density multilayer insulation combined with a one vapor-cooled shield and para-ortho hydrogen conversion was calculated. The programs developed based on the statistical thermodynamic method can be used to determine the thermophysical properties of hydrogen or other fluids. [ABSTRACT FROM AUTHOR]

Despite its increasing application to estimate magma decompression rates for explosive eruptions, the embayment speedometer has long awaited critical experimental evaluation. We present the first experimental results on the fidelity of natural quartz‐hosted embayments in rhyolitic systems as recorders of magma decompression. We conducted two high pressure‐temperature isobaric equilibrium experiments and 13 constant‐rate, continuous isothermal decompression experiments in a cold‐seal pressure vessel where we imposed rates from 0.005 to 0.05 MPa s−1 in both H2O‐saturated and mixed‐volatile (H2O + CO2)‐saturated systems. In both equilibrium experiments, we successfully re‐equilibrated embayment melt to new fluid compositions at 780°C and 150 MPa, confirming the ability of embayments to respond to and record changing environmental conditions. Of the 32 glassy embayments recovered, seven met the criteria previously established for successful geospeedometry and were thus analyzed for their volatile (H2O ± CO2) concentrations, with each producing a good model fit and recovering close to the imposed decompression rate. In one H2O‐saturated experiment, modeling H2O concentration gradients in embayments from three separate crystals resulted in best‐fit decompression rates ranging from 0.012 to 0.021 MPa s−1, in close agreement with the imposed rate (0.015 MPa s−1) and attesting to the reproducibility of the technique. For mixed‐volatile experiments, we found that a slightly variable starting fluid composition (2.4–3.5 wt.% H2O at 150 MPa) resulted in good fits to both H2O + CO2 profiles. Overall our experiments provide confidence that the embayment is a robust recorder of constant‐rate, continuous decompression, with the model successfully extracting experimental conditions from profiles representing nearly an order of magnitude variation (0.008–0.05 MPa s−1) in decompression rate. Plain Language Summary: Embayments are pockets of melt within crystals that remain in open communication with the surrounding magma, allowing their compositions to change through time. When rising magma carries an embayment‐bearing crystal toward the surface, volatiles (e.g., H2O, CO2) dissolved in the melt will diffuse through the embayment to maintain equilibrium with the surrounding degassing melt. Upon eruption and rapid cooling, volatile concentration gradients are preserved within embayment channels. This is the basis for the embayment speedometer: the volatile concentration gradients can be directly measured and numerically modeled to estimate the rate of decompression experienced by the magma. Since its formalization over a decade ago, this technique has been applied extensively, with 11 published studies leveraging the embayment speedometer to estimate magma decompression rates for 17 rhyolitic to basaltic explosive eruptions, and several additional studies in preparation. Despite the increasing application of this technique, no work to date has experimentally evaluated embayments to assess their reliability as recorders of magma decompression under controlled conditions. In this study, we use high pressure‐temperature decompression experiments to subject embayments to the conditions experienced during magma ascent. We apply numerical models to volatile analyses of the embayments to evaluate how reliably embayments record the imposed conditions. Key Points: Using equilibrium and decompression experiments, we show that natural embayments partially equilibrate on timescales of magma ascentWe build upon previous work developing embayments as reliable recorders of magma decompression rates between 0.008–0.05 MPa s−1We produce the full range of textures (glassy to vesiculated) observed in natural embayments both inter‐ and intra‐experimentally [ABSTRACT FROM AUTHOR]

In the article, the real and optimal hourly thermal energy balance of the helical compressor was designed. Through a technically feasible measure, the specific consumption of the helical compressor was reduced, and the effective heat recovered was then calculated. [ABSTRACT FROM AUTHOR]

As part of the work the high-pressure sorptomat - a novel apparatus for sorption tests under conditions of high gas pressure was developed. The sorption measurement is carried out using the volumetric method, and the precise gas flow pressure regulator is used in the device to ensure isobaric conditions and regulate the sorption pressure in the range of 0-10 MPa. The uniqueness and high precision of sorption measurements with the constructed apparatus are ensured by the parallel use of many pressure sensors with a wide measurement range as well as high precision of measurement - due to the use of precise pressure sensors. The obtained results showed, i.a. that the time of reaching the isobaric conditions of the measurement is about 6-7 seconds and it is so short that it can be considered a quasi-step initiation of sorption processes. Moreover, the results of the measurement pressure stabilization tests, during the CO2 sorption test on activated carbon, have shown that the built-in pressure regulator works correctly and ensures isobaric sorption measurement conditions with the precision of pressure stabilization of ±1% of the measurement pressure. The maximum range of sorption measurement using the high-pressure sorptomat is 0-86 400 cm3/g, and the maximum measurement uncertainty is ±2% of the measured value. The activated carbon sample used for the tests was characterized by a high sorption capacity, reaching 104.4 cm³/g at a CO2 pressure of 1.0 MPa. [ABSTRACT FROM AUTHOR]

A review of recent advances in the study of the energy splitting between excited isobaric analogue states is presented. Some of the experimental developments, and new approaches, associated with spectroscopy of the most proton-rich members of isobaric multiplets, are discussed. The review focuses on the immense impact of the shell-model in the analysis of energy differences and their interpretation in terms of nuclear structure phenomena. [ABSTRACT FROM AUTHOR]

[Display omitted] • Presents a new semiempirical adsorbed phase activity coefficient model. • Proves thermodynamic consistency through model derivation and end-behavior analysis. • Model validated using over 25 systems after thoroughly testing data quality. • Binary and ternary adsorption predicted using Real Adsorbed Solution Theory. • Presents new binary adsorption data obtained using the Integral Mass Balance Method. The following study introduces a new adsorbed phase activity coefficient model, the SPLINT model, for describing nonideal multicomponent systems. The derivation is presented and simplification to the thermodynamically robust ABC model in the low‑coverage limit is shown. Both the SPLINT and ABC models are fit to 25 binary systems. Thermodynamic consistency of the data is established through multiple consistency tests including the intersection rule, closed‑loop reduced spreading pressure integration, the Gibbs‑Duhem integral equality, and alignment of pure and binary data. Regressed parameters are used in Real Adsorbed Solution Theory to predict both binary and ternary adsorption. The ABC and SPLINT models accurately describe systems with considerable nonideality when the activity coefficients are symmetric; however, the SPLINT model is required for accurate description of systems with complex, asymmetric activity coefficient behavior. The new model includes one more fitting parameter than the ABC model for a single binary system, but less across multiple data sets and higher‑order systems due to the theoretical basis. The importance of capturing activity coefficient asymmetry is demonstrated with a highly nonideal system across various pressures and temperatures measured by the present authors using the Integral Mass Balance method with HFC‑125 (pentafluoroethane), HFC‑32 (difluoromethane), and zeolite H‑ZSM‑5. The theoretical basis of the SPLINT model is further enforced by presenting two methods for predicting activity coefficients with the SPLINT model: correlating the fitting parameters individually and simultaneously regressing pure isosteric heat data to extract SPLINT fitting parameters. The study concludes with a discussion of pure and binary HFC‑125/HFC‑32 data with zeolite H‑ZSM‑5. A possible binary adsorption mechanism is proposed based on isosteric heat and excess enthalpy predictions and observed system irreversibility. [ABSTRACT FROM AUTHOR]

For several decades, the crucial question has arisen as to whether there exists any direct interconnection between the thermodynamic parameters of point defects in solids with the bulk properties of the solid under investigation. To answer this important question, an interrelation of the defect Gibbs energy g i in solids with bulk properties has been proposed almost half a century ago. Considering that g i corresponds to an isobaric and isothermal process, this interrelation states that, for different processes (defect formation, self-diffusion activation, and heterodiffusion), g i is proportional to the isothermal bulk modulus B and the mean volume per atom Ω , termed cB Ω model. Here, we review several challenging applications of this interrelation that appeared during the last decade (2011–2021), including high pressure diamond anvil measurements, high T c superconductors, nuclear fuels, and materials for micro-electronics devices, applications of usefulness in Geophysics and Seismology, a problem of major technological interest, search for compositions of better target properties in Cu-Co-Si alloys via machine learning as well as two independent studies on the physical origin of this interrelation that has been further strengthened during the last few years. [ABSTRACT FROM AUTHOR]

We present a simultaneous broad-band analysis of X-ray data obtained with the XMM – Newton and the Nuclear Spectroscopic Telescope Array (NuSTAR) for the asynchronous polar source, CD Ind. The spin-folded light curve in the soft 0.3–3.0 keV band shows a single broad hump-like structure superimposed with occasional narrow dips, indicating a single-pole accretion model with a complex intrinsic absorber. Lack of strong modulation in the folded light curve above 3 keV reveals that emission from the corresponding zone of the post-shock region (PSR) remains in view throughout the spin phase. The broad-band spectrum is modelled with a three-component absorbed plasma emission model and absorbed isobaric cooling flow model, both of which fit the data well with similar statistical significance. The presence of a partial covering absorber is evident in the spectra with equivalent column density |${\sim}7\times 10^{22}\, \text{cm}^{-2}$| and a covering fraction of ~25 per cent. Strong ionized oxygen Kα line emission is detected in the spectra. We notice spectral variability during the spin phase 0.75–1.05, when there is a considerable increase in the column density of the overall absorber (from |${\sim}1 \times 10^{20}\, \text{cm}^{-2}$| to |${\sim}9 \times 10^{20}\, \text{cm}^{-2}$|⁠). We required at least three plasma temperatures to describe the multitemperature nature of the PSR. The shock temperature |${\sim}43.3_{-3.4}^{+3.8}$| keV, represented by the upper temperature of the cooling flow model, implies a white dwarf mass of |${\sim}0.87^{+0.04}_{-0.03}\, \mathrm{M}_{\odot }$|⁠. The iron Kα line complex show strong He-like and weak neutral fluorescence lines. We could not unambiguously detect the presence of Compton reflection in the spectra, which is probably very small and signifies a tall shock height. [ABSTRACT FROM AUTHOR]

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Accurate models of H2O and CO2 solubility in silicate melts are vital for understanding volcanic plumbing systems. These models are used to estimate the depths of magma storage regions from melt inclusion volatile contents, investigate the role of volatile exsolution as a driver of volcanic eruptions, and track the degassing path followed by a magma ascending to the surface. However, despite the large increase in the number of experimental constraints over the last two decades, many recent studies still utilize an earlier generation of models which were calibrated on experimental datasets with restricted compositional ranges. This may be because many of the available tools for more recent models require large numbers of input parameters to be hand‐typed (e.g., temperature, concentrations of H2O, CO2, and 8–14 oxides), making them difficult to implement on large datasets. Here, we use a new open‐source Python3 tool, VESIcal, to critically evaluate the behaviors and sensitivities of different solubility models for a range of melt compositions. Using literature datasets of andesitic‐dacitic experimental products and melt inclusions as case studies, we illustrate the importance of evaluating the calibration dataset of each model. Finally, we highlight the limitations of particular data presentation methods, such as isobar diagrams, and provide suggestions for alternatives, and best practices regarding the presentation and archiving of data. This review will aid the selection of the most applicable solubility model for different melt compositions, and identifies areas where additional experimental constraints on volatile solubility are required. Plain Language Summary: Being able to accurately model the solubility of H2O and CO2 in magmas is very important for understanding a wide variety of volcanic processes, such as the depths at which magma is stored in the crust, the driving force behind volcanic eruptions, and the release of volatile elements into the atmosphere. However, there has been no easy way for volcanologists to perform calculations on large datasets, or to compare different models. This review uses a new, open‐source tool called VESIcal written in the popular programming language Python3. This allows us to compare different models for a wide variety of melt compositions, temperatures, and pressures, helping researchers to identify the most suitable model for their study. We also suggest areas where further experimental constraints are required. Finally, we highlight the limitations of particular data presentation methods, such as isobar diagrams, provide suggestions for alternative plots, and best practices regarding the presentation and archiving of data. Key Points: The Python3 tool VESIcal allows extensive comparisons to be drawn between different H2O‐CO2 solubility modelsSolubility models are not interchangeable—for a single magma composition, different models can predict a wide range of solubility relationshipsThe P‐T‐X calibration range of each solubility model must be critically evaluated before application to a specific volcanic system [ABSTRACT FROM AUTHOR]

[Display omitted] • Feasible column sequences for pressure sensitive azeotropes explored. • Influence of pressure on azeotropic composition highlighted. • Effect of type of azeotropic mixture on derived column configurations deduced. • Effect of feed composition on column sequencing and process feasibility. The separation of azeotropic mixtures, particularly, pressure sensitive azeotropes is intriguing, challenging, and inevitable in chemical industries in comparison to pressure insensitive azeotropic mixtures. The main bottleneck for separating pressure sensitive azeotropes lies in the pressure selection and sequencing of distillation columns. A conundrum in pressure swing distillation for both minimum and maximum boiling azeotropes primarily about the feasibility of column configurations has been discussed in this work. The two column configurations, Low pressure Column-High Pressure Column (LPC-HPC) and High Pressure Column-Low Pressure Column (HPC-LPC) are found to be dependent on the feed composition, type of azeotrope (whether, minimum or maximum), and the effect of pressure on azeotropic composition. This article has explored concomitantly pressure swing distillation technique (continuous one) and the effect of various feed compositions on the column sequencing and process feasibility. A comprehensive strategy for both minimum and maximum boiling azeotropes has been proposed depending upon the effect of pressure on azeotropic composition. Two example case studies have been also presented in support of the proposed strategies for pressure swing distillation technique. [ABSTRACT FROM AUTHOR]

Traditional methods for determining the solubility of oxygen in water are considered. Their advantages and disadvantages are shown. It is noted that especially great difficulties arise when measuring SO in a real chemical process, where the temperature and components of the system, as well as their ratios change over time. The new method for determining the solubility of oxygen based on thermodynamic calculation of the equilibrium phase and component composition of the oxygen-water system by minimizing the isobaric-isothermal potential of Gibbs using the software package "Selector" is proposed. The model is based on the exact equation of state for calculating the chemical potential of the vapor phase and the chemical potential of the liquid phase. The result is mathematical laws of dissolution of oxygen in water depending on a wide range of temperatures and pressures, which allows significantly facilitating and expanding the range of reliable control of the parameters of chemical-technological processes. The thermodynamic model allows calculations to be performed both in pure water and in acid and salt solutions, as well as taking into account the vapor phase and without it. The equation of Henry’s constant is given X2 = 0.0181P1exp(A + B T + C ln(T) + DT) for oxygen and air from temperatures in the range of 273...373 K and pressures up to 10 atm., which allows determining any intermediate values. To do this, it is necessary to substitute in the equation the current data of temperature and pressure, which are easily measurable. It is shown that within these ranges the deviation from the experimental values is minimal ∼1%, which allows using of the presented equations in technological calculations. The value of the temperature, at which the minimum solubility of oxygen is being observed, for pure oxygen is determined Tmin = 370.5K, for air Tmin = 370.3 K., the value of enthalpy changes sign. [ABSTRACT FROM AUTHOR]

Vapor‐compression refrigeration systems are widely used in refrigeration equipment. Theoretically, the process is typically divided into two isobaric processes: an adiabatic isentropic compression process and adiabatic isentropic throttling process. The refrigeration compressor is the main energy‐consuming component in vapor‐compression refrigeration systems. However, this device has a large energy loss and low overall efficiency in the adiabatic isentropic compression process. In this study, a modified vapor‐compression refrigeration cycle with an isothermal piston is proposed to realize near‐isothermal compression of a refrigerator to significantly reduce the energy loss in the compression process and improve the system performance. A real‐gas compression process model is established, and the heat transfer index Hex is set. By changing the heat transfer index Hex, the performances of the vapor‐compression refrigeration system under ideal and real compression conditions are compared and analyzed. Compared with a traditional vapor‐compression refrigeration system, the coefficient of performance of the compressor with an isothermal compression process is increased by approximately 17%. The results also demonstrate that the lower the evaporation temperature Te and higher the condensation temperature Tc, the greater the optimization effect of the isothermal compression. [ABSTRACT FROM AUTHOR]

The international Thermodynamic Equation of Seawater 2010 (TEOS-10) defined the enthalpy and entropy of seawater, thus enabling the global ocean heat content to be calculated as the volume integral of the product of in situ density, ρ , and potential enthalpy, h0 (with reference sea pressure of 0 dbar). In terms of Conservative Temperature, Θ , ocean heat content is the volume integral of ρcp0Θ , where cp0 is a constant "isobaric heat capacity". However, many ocean models in the Coupled Model Intercomparison Project Phase 6 (CMIP6) as well as all models that contributed to earlier phases, such as CMIP5, CMIP3, CMIP2, and CMIP1, used EOS-80 (Equation of State – 1980) rather than the updated TEOS-10, so the question arises of how the salinity and temperature variables in these models should be physically interpreted, with a particular focus on comparison to TEOS-10-compliant observations. In this article we address how heat content, surface heat fluxes, and the meridional heat transport are best calculated using output from these models and how these quantities should be compared with those calculated from corresponding observations. We conclude that even though a model uses the EOS-80, which expects potential temperature as its input temperature, the most appropriate interpretation of the model's temperature variable is actually Conservative Temperature. This perhaps unexpected interpretation is needed to ensure that the air–sea heat flux that leaves and arrives in atmosphere and sea ice models is the same as that which arrives in and leaves the ocean model. We also show that the salinity variable carried by present TEOS-10-based models is Preformed Salinity, while the salinity variable of EOS-80-based models is also proportional to Preformed Salinity. These interpretations of the salinity and temperature variables in ocean models are an update on the comprehensive Griffies et al. (2016) paper that discusses the interpretation of many aspects of coupled Earth system models. [ABSTRACT FROM AUTHOR]

In 1990, a well‐known model to predict pure component properties of triglycerides was presented by Wesdorp in "Liquid‐multiple solid phase equilibria in fats: theory and experiments" and has been shown to perform well despite making thermodynamically inconsistent predictions for certain test cases. In this study, the underlying parameter set is improved to deliver more physically consistent predictions, i.e., increasing melting point and enthalpy of fusion with increasing stability of the polymorphs, without deterioration of the primary model quality to describe the available experimental data. Interestingly, when a curated dataset containing only thermodynamically consistent data is compared to a broader dataset, it appears that the model's efficacy is highly dependent on the quantity of data, specifically the number of unsaturated triglycerides data. Quality and thermodynamic consistency of model predictions and the condition of a reliable description of monoacid triglycerides as a subset is discussed, addressing a potential interdependence. [ABSTRACT FROM AUTHOR]

Fe, Mg, and O are among the most abundant elements in terrestrial planets. While the behavior of the Fe–O, Mg–O, and Fe–Mg binary systems under pressure have been investigated, there are still very few studies of the Fe–Mg–O ternary system at relevant Earth's core and super-Earth's mantle pressures. Here, we use the adaptive genetic algorithm (AGA) to study ternary FexMgyOz phases in a wide range of stoichiometries at 200 GPa and 350 GPa. We discovered three dynamically stable phases with stoichiometries FeMg2O4, Fe2MgO4, and FeMg3O4 with lower enthalpy than any known combination of Fe–Mg–O high-pressure compounds at 350 GPa. With the discovery of these phases, we construct the Fe–Mg–O ternary convex hull. We further clarify the composition- and pressure-dependence of structural motifs with the analysis of the AGA-found stable and metastable structures. Analysis of binary and ternary stable phases suggest that O, Mg, or both could stabilize a BCC iron alloy at inner core pressures. [ABSTRACT FROM AUTHOR]

Under atmospheric pressure, the density, viscosity and speed of sound of the binary system of octamethylcyclotetrasiloxane (D4) with diesel fuel's main components n-decane, n-dodecane, n-tridecane and n-tetradecane were measured at T = 288.15 to 328.15 K. The excess molar volume, viscosity deviation, excess Gibbs activation energy of viscous flow, isobaric thermal expansivity and isentropic compressibility deviation were calculated from the experimental data. The results indicate that the interactions among mixed systems are somewhat weaker than those in pure components. [ABSTRACT FROM AUTHOR]

Experimental saturated vapor pressure data were measured using a Modified Swietoslawski-type ebulliometer and correlated with the Antoine, Clarke–Glew, and Wagner equations. A least root-mean-square deviation (RMSD) was obtained for the Antoine (0.667) and Wagner (0.796) equations while the group contribution and group interaction (GCGI) method by Nanoolal et al. showed an RMSD of 1.094. The estimated enthalpy of vaporization is found to be 46.87 kJ·mol−1 and 38.56 kJ·mol−1 at reference temperature (298.15 K) and normal boiling point (422.28 K), respectively, and was well verified with Watson's correlation. The critical properties and acentric factor are reported based on the GCGI method. Experimental density data are reported and are well correlated with the DIPPR 116 correlation with an RMSD of 0.00416. Joback's method predicted the densities well with a maximum absolute deviation (MAD) of 0.00548. The Vogel–Tamman–Fulcher equation correlated the experimental viscosities in the temperature range of 288.15–338.15 K with a MAD of 0.002. The isothermal expansivity for tribromomethane shows a linear trend with a weak temperature dependency. [ABSTRACT FROM AUTHOR]

Just like everything in nature, scientific topics flourish and perish. While existing literature well captures article's life-cycle via citation patterns, little is known about how scientific popularity and impact evolves for a specific topic. It would be most intuitive if we could 'feel' topic's activity just as we perceive the weather by temperature. Here, we conceive knowledge temperature to quantify topic overall popularity and impact through citation network dynamics. Knowledge temperature includes 2 parts. One part depicts lasting impact by assessing knowledge accumulation with an analogy between topic evolution and isobaric expansion. The other part gauges temporal changes in knowledge structure, an embodiment of short-term popularity, through the rate of entropy change with internal energy, 2 thermodynamic variables approximated via node degree and edge number. Our analysis of representative topics with size ranging from 1000 to over 30000 articles reveals that the key to flourishing is topics' ability in accumulating useful information for future knowledge generation. Topics particularly experience temperature surges when their knowledge structure is altered by influential articles. The spike is especially obvious when there appears a single non-trivial novel research focus or merging in topic structure. Overall, knowledge temperature manifests topics' distinct evolutionary cycles. [ABSTRACT FROM AUTHOR]

The Bi-Rh binary phase diagram was modelled by CALPHAD approach for the first time. The modelled phase diagram is based mainly on recently published experimental phase diagrams. Very good agreement with the experimental results was reached for the Bi-Rh phase diagram and for the calculated thermodynamic properties, namely the standard enthalpy of mixing of the BiRh phase at 25 °C. [ABSTRACT FROM AUTHOR]

The work continues the project of physicochemical characterization of terpenic substances that are present in plants and after emission to the atmosphere play an important role in the formation of cloud condensation nuclei. Two substances, which are solid at room temperature, were studied in this work, namely both enantiomers of menthol and (–)- α -terpineol. Temperatures and enthalpies of fusion were measured, isobaric heat capacities were measured in the temperature range 326.15–348.15 K and vapor pressures were measured in the temperature range 400–430 K. The experimental values were compared with predictions by COSMO-RS. Modern nonstatistical algorithms based on mathematical gnostics were used for data analysis. [ABSTRACT FROM AUTHOR]

Two methods were proposed to calculate the thermodynamic parameters of porous ceramic compacts depending on their molar volume change with applied pressure and heating temperature, respectively. Molar volume of the porous α-alumina (α-Al2 O3) compact was evaluated according to literature depending on both the applied pressure at room temperature and the heating temperature at atmospheric pressure. The isothermal compressibility coefficient, Gibbs energy, and work done on the compact by compression were calculated. The thermal shrinkage coefficient and activation energy as well as the change in enthalpy, entropy and Gibbs energy were calculated for partial sintering. The spontaneous nature of the treatments were discussed with respect to the obtained results. [ABSTRACT FROM AUTHOR]

The thermodynamic properties of crystalline platinum disulfide have been studied in the range from 5 to 875 K. The isobaric heat capacity of PtS2 has been determined by two methods: by adiabatic calorimetry from 5.32 to 344.96 K and by differential scanning calorimetry in the range 344.6–874.6 K. Using the experimental Cp(T) data, we evaluated the standard thermodynamic functions of platinum disulfide in a wide temperature range. The high-temperature Cp measurement results have been used to investigate regression models based on the Maier–Kelley and Khodakovsky equations for the temperature dependence of its isobaric heat capacity in the range from 298 to 875 K. The Debye characteristic temperature ΘD of PtS2 has been evaluated as a function of temperature. [ABSTRACT FROM AUTHOR]

The paper describes an experimental setup for the measurement of the isobaric thermal conductivity of molecular crystals in the temperature range from 80 K to 300 K. A scheme of the developed experimental setup for measuring the thermal conductivity by the linear-flow steadystate method under saturated vapor pressures has been presented. A modified heat potentiometer method with one thermometer was used, which allowed us to minimize the error in the estimation of the thermal conductivity due to the uncontrollable heat flows and different calibration of thermometers. The noncontrollable heat flows from thermal radiation were reduced considerably with a radiation shield on which the temperature field of the measuring cell was reproduced using a set of thermocouples and precision heat controllers. The total systematic error in the measurement of the thermal conductivity does not exceed 5%. [ABSTRACT FROM AUTHOR]

• New VLE data at 101.3 kPa for acetonitrile + water + ionic liquids were reported. • The azeotropy was eliminated by [HMIM][Cl], [BMIM][Cl], [AMIM][Cl] and [BMIM][OAC]. • The sequence of separation ability is [BMIM][OAC] > [AMIM][Cl] > [BMIM][Cl] ≈ [HMIM][Cl]. • A crossover effect of salting-in and -out of acetonitrile is observed. Isobaric vapour-liquid equilibrium (VLE) for the (acetonitrile + water) system containing 1-hexyl-3-methylimidazolium chloride ([HMIM][Cl]), 1-butyl-3-methylimidazolium chloride ([BMIM][Cl]), 1-allyl-3-methylimidazolium chloride ([AMIM][Cl]) and 1-butyl-3-methylimidazolium acetate ([BMIM][OAC]) are measured at atmospheric pressure (101.30 kPa). The experimental results show that the addition of ionic liquids (ILs) can improve the separation of acetonitrile and water and eliminate the azeotrope when the content of ILs reaches a certain value. The separation ability of ILs is [BMIM][OAC] > [AMIM][Cl] > [BMIM][Cl] ≈ [HMIM][Cl]. A crossover effect of salting-in and -out of acetonitrile in different concentration ranges is observed. The experimental VLE data are satisfactorily correlated with the non-random two liquid (NRTL) model. Additionally, COSMO-SAC is employed to predict the phase behaviours of the investigated systems and good trends are obtained. [ABSTRACT FROM AUTHOR]

This work investigated saturated vapor pressure and isothermal vapor-liquid equilibrium (VLE) for 1,1,1,2-Tetrafluoroethane (HFC-134a) + 3,3,3-trifluoropropene (HFO-1243zf) binary system. The saturated vapor pressures of HFC-134a and HFO-1243zf ranging from (273.17–353.13) K, and VLE data at four temperatures (283.15, 293.15, 313.15, 323.14) K for the HFC-134a + HFO-1243zf system were measured by a static-analytical apparatus. The vapor pressure data of HFO-1243zf were regressed by a Wagner type equation and compared with existing literature data. The experimental VLE data of HFC-134a + HFO-1243zf system were correlated by Peng-Robinson (PR) equation of state (EOS) combined with van der Waals (vdW) mixing rules. The binary interaction parameters were obtained, and correlation deviation was acceptable. Azeotropic behavior can be found for the HFC-134a + HFO-1243zf system at measured temperatures. Our work provides fundamental thermodynamic properties of new mixed refrigerants which are crucial to evaluate their cycle performance and optimize the design of refrigeration system. [ABSTRACT FROM AUTHOR]

n -Hexane is a significant component of industrial fluids. The speed of sound in supercritical n –hexane was measured by Brillouin light scattering (BLS) technique in the temperature range from (509.17–637.99) K along five isobars at p = (3.5, 4.5, 5.5, 6.5 and 7.5) MPa. The relative expanded measurement uncertainty in the speed of sound at the 95% confidence level is estimated to be 0.018. For the studied supercritical n –hexane, the change regularities of the speed of sound with increasing temperature and pressure are illustrated. Moreover, the well-known equation of state (EOS) proposed by Span and Wagner is assessed, and the absolute average deviation (AAD) between the experimental results and the calculated values is 0.89% for the whole examined p – T region. Image 1 ● New experimental data of the speed of sound in supercritical n -hexane along five isobaric lines were presented. ● An advanced optical method for measuring the speed of sound in supercritical fluid was reported. ● The EOS proposed by Span and Wagner was assessed by the experimental speed of sound in supercritical n -hexane. [ABSTRACT FROM AUTHOR]

In the development of CO2 capture and utilization, the physical and transport properties of the binary systems are significant, because these can affect the gas absorption and desorption processes. Thus, we report the densities and viscosities of two binary systems: 2-ethoxyethanol (ECS) + water (H2O) and ECS + dimethyl sulfoxide (DMSO), with various compositions at temperatures from (298.15 to 318.15) K. On the basis of these data, excess molar volumes ( V m E ) and viscosity deviations (Δη) were calculated. The V m E values of the two binary mixtures are negative and decrease with increasing temperatures; Δη values are positive at all compositions and decrease with increasing temperatures. The V m E and Δη values were fitted with the Redlich–Kister equation. The physico-chemical properties of the two binary systems, including activation enthalpy and entropy, were calculated from the kinematic viscosity. In addition, various spectral results offer evidence for the formation of weak interactions between ECS and DMSO or H2O. [ABSTRACT FROM AUTHOR]

Melt-grown single crystals of Ca 3 Al 4 ZnO 10 have been structurally characterized at ambient conditions (space group Pbcm , a = 5.1364(3), b = 16.7403(9), c = 10.7019(6) Å, V = 920.20(8) Å3, Z = 4, R(|F|) = 0.026 for 1116 reflections with I > 2σ(I) and 95 parameters). Our results show that the compound had been previously described in unnecessarily low symmetry. It represents a three-dimensional network of corner-sharing [(Al,Zn)O 4 ]-tetrahedra containing oxygen atoms simultaneously linking three adjacent tetrahedra. Charge compensation is provided by Ca ions residing in voids of the network. The high-temperature and high-pressure behavior was elucidated between 25(2) and 797(2) °C and between ambient pressure and 6.8(1) GPa. No indications for structural phase transitions have been found. However, a diffraction experiment performed at 9.0(1) GPa gave evidence for the beginning of an amorphization. From the evolution of the lattice parameters thermal expansion and compressibility tensors have been obtained. The behavior of Ca 3 Al 4 ZnO 10 at non-ambient conditions conforms with the so-called inverse relationship for temperature and pressure, i.e. isobaric thermal expansion and isothermal compression have opposite effects on changes of structural parameters. Representation surfaces of the thermal expansion and compressibility tensors for Ca 3 Al 4 ZnO 10. Image 1 • We report the revised crystal structure of Ca 3 Al 4 ZnO 10 at ambient conditions that had been previously described in an unnecessarily low space group symmetry. • In-situ high-temperature and high-pressure single-crystal diffraction studies have been performed between (i) room temperature and 797 °C and (ii) ambient pressure and 9.0 GPa. • The thermal expansion and compressibility tensors have been determined. • A detailed analysis of the evolution of the unusual tetrahedral framework as a function of T and P is presented. [ABSTRACT FROM AUTHOR]

Abstract In this work a new method for inclusion of pressure effects in COSMO-type activity coefficient models is proposed. The extension consists in the direct combination of COSMO-SAC and lattice-fluid ideas by the inclusion of free volume in form of holes. The effort when computing pressure (given temperature, volume, and mole numbers) with the proposed model is similar to the cost for computing activity coefficients with any COSMO-type implementation. For given pressure, computational cost increases since an iterative method is needed. This concept was tested for representative substances and mixtures, ranging from light gases to molecules with up to 10 carbons. The proposed model was able to correlate experimental data of saturation pressure and saturated liquid volume of pure substances with deviations of 1.16% and 1.59%, respectively. In mixture vapor-liquid equilibria predictions, the resulting model was superior to Soave-Redlich-Kwong with Mathias-Copeman α -function and the classic van der Waals mixing rule in almost all cases tested and similar to PSRK method, from low pressures to over 100 bar. Good predictions of liquid-liquid equilibrium were also observed, performing similarly to UNIFAC-LLE, with improved responses at high temperatures and pressures. Graphical abstract Image 1 [ABSTRACT FROM AUTHOR]

Highlights • A multiscale micromechanical homogenization framework is proposed for fluid-filled porous materials. • The overall elastic properties of the fluid-filled porous materials are determined in the framework. • The effects of pore distribution and fluid pressure on the effective elastic properties are quantified. • By considering the fluid diffusion from macro- to micro-scale pores, evolution of the effective properties is predicted. Abstract Fluid-filled porous materials are widely encountered in natural and artificial systems. A comprehensive understanding of the elastic behavior of such materials and its dependence on fluid diffusion is therefore of fundamental importance. In this work, a multiscale framework is developed to model the overall elastic response of fluid-filled porous materials. By utilizing a two-dimensional micromechanical model with porosity at two scales, the effects of fluid diffusion and the geometric arrangement of pores on the evolution of effective properties in fluid-filled porous materials are investigated. Initially, for a single-porosity model the effective elastic properties of the dry and fluid-filled porous materials with ordered pores are obtained theoretically by considering a geometrical factor, which is related to the distribution of pores in the matrix. Model predictions are validated by finite element simulations. By employing a double-porosity model, fluid diffusion from macro- to micro-scale pores driven by a pressure gradient is investigated, and the resulting time-dependent effective elastic properties are obtained for both constant pressure and constant injection rate conditions. It is found that the presence and diffusion of pressurized pore fluid significantly affect the elastic response of porous materials, and this must be considered when modeling such materials. It is expected that the proposed theoretical model will advance the understanding of the fluid-governed elastic response of porous materials with implications towards the analysis of geophysical, biological and artificial fluid-filled porous systems. Graphic abstract Image, graphical abstract [ABSTRACT FROM AUTHOR]

Abstract Thousands of polymers have been synthesized to produce membranes for gas permeation. Currently, their potential as a viable material is often bench-marked in the so-called Robeson plot. This plot gives a first impression of the transport properties at ideal low pressure conditions and ambient temperature. However, these data are of limited significance as they do not represent realistic process conditions. Here, we present a new methodology which allows a more comprehensive judgment of membrane transport properties based on their influence on overall processing costs. In particular, we apply this methodology to the question whether the materials discovered so far offer benefits when applied at sub-ambient temperatures. For a variety of applications, this rigorous approach proves that for certain materials the overall process costs can be minimized by applying sub-ambient process conditions. It also emphasizes that temperature-dependent permeation data is important to be reported for new materials. Graphical abstract fx1 Highlights • Adding temperature dependency to the Robeson-plot. • Extending the window of considerable operation conditions for membrane processes. • Data analysis of temperature dependence of gas permeability in polymers. • Economic evaluation of low temperature gas permeation processes. • Process optimization to find optimal operation temperature. [ABSTRACT FROM AUTHOR]

Highlights • The linear stability analysis of a fluid saturated inclined porous layer is presented. • The layer has a lower impermeable and an upper permeable boundary. • The layer boundaries are isothermal at different temperatures. • The longitudinal rolls turned out to be the most unstable modes. Abstract The linear stability analysis of a fluid saturated porous layer is carried out. The porous layer is inclined to the horizontal and is infinitely wide. One boundary of the layer is permeable while the other one is impermeable. The two boundaries are subject to different temperatures, so that convective instability may arise when such a temperature difference exceeds a threshold value. The basic state whose stability is studied consists of a single cell with no net mass flow rate. The critical values of the governing parameters are computed numerically and are presented as functions of the inclination angle. The threshold relative to the horizontal layer recovers the results already present in the literature. The inclination angle comes out to be a stabilising parameter such that the vertical layer cannot become unstable. [ABSTRACT FROM AUTHOR]

• Distinctly different mixing behaviors from different schemes are analyzed. • Two limiting mixing models are identified. • Theoretical analysis is confirmed with numerical simulation results. • Available experimental data is utilized to assess different mixing models. Accurate and robust simulations of transcritical real-fluid flows are crucial for many engineering applications. Diffuse-interface methods are frequently employed and several numerical schemes have been developed for simulating transcritical flows. These schemes can be categorized into two types, namely fully conservative (FC) and quasi-conservative (QC) schemes. In this study, numerical analysis is conducted to show that the mixing processes for isobaric systems follow the limiting cases of adiabatic and isochoric mixing models when FC and QC schemes are employed, respectively. It is shown that these distinct mixing behaviors are a consequence of numerical diffusion instead of physical diffusion, and can be attributed to insufficient spatial resolution. By considering several test cases, numerical simulations confirm these theoretical results. The analysis of experimental data suggests that the isochoric mixing provides better agreement in terms of the phase separation behavior. This analysis provides quantitative understanding on the interpretation of numerical simulation results and the mixing models that are commonly used to study transcritical flows. [ABSTRACT FROM AUTHOR]

Abstract The RM-wrap (RM = Refractory Metal) is a pressure-less, versatile and tailorable joining process: it consists of wrapping Si foils inside a refractory metal wrap (i.e., Mo, Nb, Ta) in order to prevent molten silicon from leaking outside the joined region and infiltrating the facing materials during the joining process. RM-wrap (RM = Mo, Nb, Ta) has been successfully applied to join C/SiC composites in this work: optimized joining treatment consisted of heating to 1450 °C with a heating rate of 1000 °C/h followed by a dwell time of 5 min in a non-reactive environment of Argon flow. The joints were characterized by morphological analysis and lap shear tests at room temperature and 1000 °C. Microscopical analysis revealed an in-situ formed composite joint consisting of a silicon matrix reinforced with silicides of the refractory metals. Joining material exhibited continuous and cracked free bonding with C/SiC irrespective of composite fibre orientation. Joints lap shear strength values at 1000 °C were higher than at room temperature, probably due to the brittle to ductile transition (BTDT) of silicon and silicides. Vickers microhardness on refractory metal disilicides measured inside the joints showed a trend similar to their mechanical strength, with higher lap shear strength and hardness for Mo-Wrap and lower for Ta-wrap joints. [ABSTRACT FROM AUTHOR]

Study of the hydrothermal dynamics of Yellowstone Lake (Wyoming, USA) is important for identifying potential changes in sublacustrine hydrothermal systems in response to external perturbations from earthquakes, seiches, large waves, and seasonal effects. Remotely operated vehicle (ROV) submersible-based investigations of hydrothermal vents offshore from Stevenson Island reveal numerous non-constructional ~10-cm-diameter orifices with diffuse fluid flow at temperatures up to 174 °C. The vent field occurs in a large roughly conical depression on the lake floor at a water depth of ~120 m. The volatile-rich composition (CO2, H2S) of the vent fluids is preserved by using a novel isobaric sampling system that precludes degassing effects. In addition to high temperatures, the vent fluids have high CO2 and H2S, but low chloride (Cl) and major element concentrations largely indistinguishable from those in ambient lake water. These results are consistent with steam addition to the sublacustrine hydrothermal system. Kaolinite- and boehmite-rich alteration indicates acidic conditions and provides a low-permeability substrate that may contribute to the development of a steam-heated upflow zone. At the scale of individual vent areas (centimeters to meters), perturbations cause bursts of steam-rich fluids that locally expel and disperse sediment and contribute to the formation of vent orifices. Here we report on chemical and physical phenomena associated with the hottest and deepest sublacustrine hydrothermal vents in Yellowstone Lake. Results indicate that vapor-dominated sublacustrine systems are fundamentally different in hydrothermal alteration and hydrothermal dynamic characteristics than their liquid-dominated counterparts. [ABSTRACT FROM AUTHOR]

Highlights • CO 2 huff 'n' puff process study on CO 2 storage and enhance heavy oil recovery. • A novel equation to predict relation between CO 2 and heavy oil production. • A new terminology is defined to analyze the production performance. • The soaking time and pressure depletion rate are optimized and upscaled. Abstract In order to study a potential way to store CO 2 and enhance heavy oil production performance, five experiments are implemented on the CO 2 huff 'n' puff process using long cores. The production profiles of the CO 2 huff 'n' puff process are analyzed, including pressure, heavy oil recovery factor, gas production, cumulative gas oil ratio, and pressure difference. The pressure drops indicate the CO 2 diffusion in heavy oil. The pressure drop in the first cycle is much lower than those in the subsequent cycles. The heavy oil recovery factor is higher than 32.75% and can reach as high as 38.02% under the pressure depletion rate of 1 kPa/min. A main trend observed for each test is that the heavy oil recovery factor decreases with increases in the cycle number. With oil production, a growing space is available for CO 2 injection in the core, resulting in a higher volume of injected CO 2 together with increasing gas production and a cumulative gas oil ratio. With less heavy oil production, the pressure difference between the end port and the production port decreases with the cycle number increases. A novel equation is developed to study the relationship between CO 2 production and heavy oil production, and the agreement between the equation and the experimental data is extremely high ( R 2 > 0.97). This novel equation can be applied to predict the production performance in the later production period in the same cycle and/or to predict the performance in the subsequent cycles. Via the analyzation of the production performance of the CO 2 huff 'n' puff process in heavy oil under different pressure depletion rates and different soaking times, the effect parameters, including pressure depletion rates, soaking time and cycle numbers, are optimized in this study. The optimized pressure depletion rates, soaking time, and cycle numbers are 1 kPa/min, 5 h and 3 cycles, respectively. The optimized parameters gained in the tests were upscaled using the scaling criteria, and the upscaled parameters can be applied in the field pilot test to enhance heavy oil recovery using the CO 2 huff 'n' puff process. [ABSTRACT FROM AUTHOR]

We present quantum molecular dynamics calculations of thermophysical properties of solid and liquid molybdenum in the vicinity of melting. Detailed analysis of available experimental isobaric expansion data and extensive comparison over a wide set of properties with results of first-principle calculations is presented, possible reasons of contradictions are discussed. Accurate calculation of zero isobar confirms the density of solid Mo measured by electrostatic levitation technique and the lowest density of molten Mo observed in pulse heating experiments, that gives a substantial volume change on melting of about 5.5%. [ABSTRACT FROM AUTHOR]

• The VLE data of R1234ze(E)/R1336mzz(E) mixed refrigerant were measured by the liquid phase circulation method. • The PR + vdW and PR + HV + NRTL models were used to correlate the experimental data. • R1234ze(E)/R1336mzz(E) mixed refrigerant shows zeotropic behavior within 283.15 to 313.15 K. Growing concerns regarding energy and environmental issues have prompted the development of refrigerants focused on energy conservation and environmental protection. Mixed refrigerants incorporating fourth-generation hydrofluoroolefins (HFOs) represent a promising advancement. Notably, R1234ze(E) and R1336mzz(E) are representative examples of environmentally friendly refrigerants within the HFO category. In this study, a vapor–liquid equilibrium (VLE) experimental apparatus was constructed based on the liquid-phase cycling method, and the VLE data for eleven R1234ze(E) + R1336mzz(E) mixed refrigerants with varying proportions were measured within the temperature range of 283.15 ∼ 313.15 K. In addition, all the experimental data were correlated using two models: the Peng-Robinson (PR) equation of state combined with the van der Waals (vdW) mixing rule, and the PR equation of state combined with the Huron-Vidal (HV) mixing rule involving the non-random two-liquid (NRTL) activity coefficient. The results indicate that R1234ze(E) + R1336mzz(E) mixed refrigerants do not exhibit azeotropic behavior within the studied temperature range. Furthermore, both the PR + vdW and PR + HV + NRTL models show good agreement with the experimental data, with the latter model demonstrating superior performance. [ABSTRACT FROM AUTHOR]