Methane and Carbon Dioxide Hydrate Formation and Dissociation in Presence of a Pure Quartz Porous Framework Impregnated with CuSn12 Metallic Powder: An Experimental Report

Hydrate formation and dissociation processes were carried out in the presence of a pure quartz porous medium impregnated with a metallic powder made with a CuSn12 alloy. Experiments were firstly made in the absence of that powder; then, different concentrations were added to the porous medium: 4.23 wt.%, 18.01 wt.%, and 30.66 wt.%. Then, the hydrate dissociation values were compared with those present in the literature. The porous medium was found to act as an inhibitor in the presence of carbon dioxide, while it did not alter methane hydrate, whose formation proceeded similarly to the ideal trend. The addition of CuSn12 promoted the process significantly. In particular, in concentrations of up to 18.01 wt.%, CO2 hydrate formed at milder conditions until it moved below the ideal equilibrium curve. For methane, the addition of 30.66 wt.% of powder significantly reduced the pressure required to form hydrate, but in every case, dissociation values remained below the ideal equilibrium curve.

Teologika Kepemimpinan Pelayanan Konstrutif

Leadership in the title describes the attitudes and abilities of a person who is selected with competence and Christian character based on theological studies, so as to be able to support constructive service fields. Nowadays the productivity review and leadership principles are often absent to fill the fundamentals that remain true to theological ground because of the wide range of experiential product offerings. However, the product is at a distance, then the equilibrium curve is inversely proportional and there is a weak understanding of the theological basis, so that it loses the authority and spiritual competency due to no longer relying on the Bible, as a result constructive service becomes sloping. This paper aims to systematically describe the capacities and capabilities of leadership in the context of constructive service to the people, so that the framework as well as the sketches that have been presented in this paper is able to answer the crisis and friction surrounding leadership. This research approach uses descriptive, literary and exegetical methods, which means explaining by investigating various related literatures and then analyzing it word for word to extract the hidden meanings of the text and context. Kepemimpinan dalam judul tersebut memaparkan tentang sikap dan skill seorang terpilih dengan kompetensi serta karakter kristiani yang berpijak pada kajian teologika, sehingga mampu mem’back-up’ untuk menunjang bidang layanan yang konstruktif. Dewasa ini produktivitas tinjauan dan kaidah kepemimpinan acapkali absen mengisi soal-soal fundamental yang tetap setia pada pijakan teologis oleh karena maraknya tawaran produk pengalaman. Akan tetapi produk tersebut berjarak yang kemudian kesetimbangan kurva berbanding terbalikdan terjadi adanya lemahnya pemahaman pijakan teologis.Sehingga kehilangan kewibawaan dan kewenangan spiritualitas disebabkan tidak bertumpu lagi pada Alkitab akibatnya pelayanan konstruktif melandai. Tulisan ini bertujuan untuk membentangkan secara sistematis akademis tentang kapasitas dan kapabilitas kepemimpinan dalam rangka pelayanan konstruktif kepada umat. Sehingga kerangka sekaligus sketsa yang sudah disuguhkan dalam tulisan ini mampu menjawab krisis dan friksi seputar kepemimpinan. Pendekatan riset ini dengan metoda deskriptif, pustaka dan eksegesa yang artinya memaparkan dengan menyelidiki berbagai literatur terkait kemudian ditelaah kata demi kata untuk mengeluarkan makna tersembunyi dari teks dan konteks.

Numerical description of the viscoelastic properties of low- and high-filled elastomeric nanocomposites

In this work, an analytical solution is found for the change in the dissipative (inelastic) part of the stress tensor at a constant rate of uniaxial loading of the material within the framework of a new thermodynamic model of the behavior of viscoelastic materials. At the same time, a fairly accurate coincidence of the theoretical curve constructed on the basis of the obtained solution with the experimental results was demonstrated. For this, uniaxial tests with nested loading cycles were carried out for samples of low- and high-filled elastomeric nanocomposites with various fillers. At each section of loading and unloading, time holdings were set, which made it possible to neglect the temporal processes taking place in the material, this makes it possible to experimentally find the equilibrium deformation curve. The resulting equilibrium curve can be described using the elastic potential. Having determined the equilibrium (elastic) and finding the dissipative (inelastic) parts of the stress tensor, the viscoelastic response of the considered elastomeric materials was described with high accuracy.

NOTA SULLA NON LINEARITÀ DEL SISTEMA RESPIRATORIO: COME L’EMOGLOBINA LEGA GASTON TISSANDIER A REINHOLD MESSNER

This article starts from an aeronautical tragedy to track briefly the history of the oxygen equilibrium curve and the creation of Hill’s model of it. After having argued that the characteristics of such a curve determine the non-linear behaviour of the respiratory system, I discussed some functional consequences of this behaviour, which explain how it happened that Reinhold Messner succeeded in the extraordinary enterprise of climbing Mount Everest without supplementary oxygen.

Research and derivation for Wien’s displacement law by using catastrophe theory

In this paper, Wien’s displacement law as one of the most important laws of thermal radiation, for which Wien has won the Nobel Prize in Physics, is studied and derived from the perspective of phase transition by using catastrophe theory. This paper describes in detail how the control variable causes the phase transition of the system potential function and the main indexes for judging whether the phase transition occurs. By extending the control variable in the catastrophe theory affecting the thermal radiation into multi-parameters form, the function equilibrium curve of the blackbody radiation is solved, and then the two expressions of Wien’s displacement law including wavelength-temperature and wavelength-temperature are derived theoretically. Furthermore, a phase transition method is proposed to study the thermal radiation of blackbody. This not only provides a new perspective for the research of thermal radiation, but also provides a new idea for the study of other phase transitions.

The Effect of CO2 Partial Pressure on CH4 Recovery in CH4-CO2 Swap with Simulated IGCC Syngas

To investigate the influence of CO2 partial pressure on efficiency of CH4-CO2 swap from natural gas hydrates (NGHs), the replacement of CH4 from natural gas hydrate (NGH) is carried out with simulated Integrated Gasification Combined Cycle (IGCC) syngas under different pressures, and the gas chromatography (GC), in-situ Raman, and powder X-ray diffraction (PXRD) are employed to analyze the hydrate compositions and hydrate structures. The results show that with the P-T (pressure and temperature) condition shifting from that above the hydrate equilibrium curve of IGCC syngas to that below the hydrate equilibrium curve of IGCC syngas, the rate of CH4 recovery drastically rises from 32% to 71%. The presence of water can be clearly observed when P-T condition is above the hydrate equilibrium curve of IGCC syngas; however the presence of water only occurs at the interface between gas phase and hydrate phase. No H2 is found to present in the final hydrate phase at the end of process of CH4-CO2 swap with IGCC syngas.