1,154 research outputs found
Mobilisations catholiques en faveur de l’accueil des Chrétiens d’Orient
No full textDepuis quelques années, il est question de la cause des « Chrétiens d’Orient ». Une partie de l’opinion publique française se sent concernée par leur sort et désire agir en leur faveur.Quand et comment la cause des Chrétiens d’Orient est-elle apparue ? Qui sont celles et ceux qui se mobilisent en leur faveur ? Quels dispositifs de solidarité et d’accueil ont été mis en place ? Comment les Chrétiens d’Orient vivent-ils à l’heure actuelle en France ? Retourneront ils un jour dans leur pays d’origine ?Au-delà des questions philosophiques, morales et théologiques que ces questions supposent, Milad-Noël Saad a enquêté durant plus d’un an auprès d’associations et d’organisations chargées de favoriser l’accueil des Chrétiens d’Orient. Il a rencontré des hommes et des femmes politiques qui ont plaidé en faveur de cette minorité persécutée et qui se sont regroupés dans des collectifs tels que « Les Maires avec les Chrétiens d’Orient ». Il a aussi enquêté au cœur d’organisations catholiques et œcuméniques dont l’amour du prochain est le maître mot. Il a enfin rencontré, des mois durant, des dizaines de familles exilées afin de comprendre les souffrances endurées, mais aussi, de saisir les limites des dispositifs d’accueil existant.L’enquête à laquelle s’est livrée l’auteur nous plonge dans l’univers exceptionnel de l’accueil des réfugiés. L’ouvrage qui en est issu offre un regard renouvelé, et d’une profonde actualité, sur les nouvelles politiques d’accueil des réfugiés en France mais aussi sur la pluralité des mobilisations catholiques vis-à-vis de la question de l’immigration et tout spécifiquement celle des Chrétiens orientaux. Il pose, en filigrane, la question de leur conformisme à l’appel du Vatican depuis Benoit XVI jusqu’à l’Appel du Pape François pour les migrants et réfugiés
Performance of a micro-engineered ultrasonic particle manipulator
No full textAn ultrasonic microfluidic particle manipulator has been modeled and its experimentally measured separation performance has been compared with the modeled results for 1 µm latex particles, and yeast particles in water
Tribological characterisation of MoSe2 and MoSe2/DLC-W coatings under oil-lubricated sliding conditions.
No full textReducing frictional losses and wear of the piston rings/cylinder liner tribo-pair in a heavy-duty vehicle’s internal combustion engine is a key enabler for minimising fuel consumption, boosting engine efficiency and durability, and minimising hazardous greenhouse gas emissions. One possible approach for reducing friction and improving wear resistance of the piston rings/cylinder liner tribo-pair is to use surface coatings with low coefficients of friction and excellent wear resistance. Molybdenum diselenide (MoSe2) coating can be a promising candidate for the tribo-pair due to its desirable properties such as low coefficient of friction, high load-bearing capacity, high thermal stability, low sensitivity to air humidity, and good wear resistance. For the actual assessment of the potential of MoSe2 coating for the piston rings/cylinder liner tribo-pair, an in-depth investigation and understanding of its tribological performance with oil lubrication are needed because this tribo-pair typically operates under oil lubricated conditions. However, the entire attention of tribological research conducted on this coating has focused on its tribological performance under dry sliding conditions only, whereas its tribological performance under oil-lubricated sliding conditions has not gained overwhelming attention and remains unexplored. To evaluate its suitability for the piston rings/cylinder liner tribo-pair, it is imperative to have a thorough understanding of its tribological performance in conjunction with oil lubrication. Accordingly, the aim of the present work was to study and investigate the influence of oil lubrication on the tribological performance of MoSe2 coating when used under oil-lubricated sliding conditions. Using magnetron sputtering, pure MoSe2 coating and layered coating comprising MoSe2 and tungsten-doped diamond-like carbon (MoSe2/DLC-W) were deposited on steel discs and characterised using a variety of experimental techniques. Their tribological properties were evaluated against steel balls using a reciprocating tribometer in polyalphaolefin 4 (PAO4 - the most common synthetic base oil used in industrial and automotive lubricants). Their tribological properties were also evaluated under dry sliding conditions for comparative purposes. Following the tribological tests, different experimental techniques, including profilometry, SEM, EDS, Raman spectroscopy, FIB, and TEM were used for analysing the worn surfaces of coatings and their sliding counterparts to develop a better understanding of the underlying friction and wear mechanisms involved. When MoSe2 coating was assessed in PAO4-lubricated sliding, it demonstrated a high coefficient of friction (0.101). A crystalline MoSe2 tribo-layer with basal planes aligned parallel to the sliding direction, which is known to be crucial for the low-friction mechanism of this type of coatings, was not formed in the coating wear track. Similarly, no beneficial MoSe2 transfer layer was formed on the sliding counterpart. The combined effect of these two factors accounted for this high coefficient of friction. This high friction was accompanied by a low wear rate (15.2 x 10-6 mm3/N.m) because the oil worked as a sealant and protected the coating from oxidation. In dry sliding, the coating exhibited a low coefficient of friction (0.054). This low friction was attributed to the combined effect of the formation of a lubricous MoSe2 transfer layer on the sliding counterpart and the presence of a crystalline MoSe2 tribo-layer in the coating wear track with basal planes aligned parallel to the sliding direction. However, this low friction was accompanied by a high wear rate (20.8 x 10-6 mm3/N.m), caused by the oxidation of the coating during sliding and the formation of metal oxides that abraded the coating. When MoSe2 coating was tribologically assessed in PAO4-lubricated sliding at different applied loads and temperatures, it exhibited coefficients of friction in the range 0.067-0.101 and in the range 0.075-0.101, respectively. As the applied load or temperature increased, the coefficient of friction and wear rate of the coating were observed to decrease. Increasing the applied load or temperature was found to enhance the degree of transfer layer formation of the coating on its sliding counterpart, resulting in low friction and wear. When MoSe2/DLC-W coating was tribologically assessed in PAO4-lubricated sliding at different applied loads, it exhibited high coefficients of friction in the range 0.064-0.12. The oil acted as a barrier between sliding surfaces and significantly hindered the transfer of the coating to its sliding counterpart, making the formation of a beneficial transfer layer impossible. It also prevented the graphitisation of carbon during sliding. These two factors contributed to the ..
Religious and philosophical psychology in the works of N.M. Bogolyubov
No full textWe present the results of historical and psychological research filling the gaps of contemporary knowledge about personalities of religious and philosophical direction of Russian psychology in late XIX – early XX centuries. The author introduces the biography of events and the views of Russian psychologist N.M. Bogolyubov – a man of uneasy fate, embodied in his work the idea of spiritual practice in the analysis and description of a person's inner world. Psychological works of N.M. Bogolyubov reflect the views common for Russian spiritual direction in psychology: consideration of man's inner world by revealing how mental experience is given to the person, his self, recognition of the soul as a sphere of inner reality, recognition of the mental world of a person as an independent entity, living by its own laws, which do not depend on the laws of the material world, asserting that faith can be a valid knowledge. In the arsenal of creative achievements of N.M. Bogolyubov are determination of the value of psychology in studying the problem of religious consciousness and professionalism as a necessary quality of a researcher psychologist in the field
An improved thick-film piezoelectric material by powder blending and enhanced processing parameters
No full textThis paper details improvements of the d33 coefficient for thick-film lead zirconate titanate (PZT) layers. In particular, the effect of blending ball and attritor milled powders has been investigated. Mathematical modeling of the film structure has produced initial experimental values for powder combination percentages. A range of paste formulations between 8:1 and 2:1 ball to attritor milled PZT powders by weight have been mixed into a screen-printable paste. Each paste contains 10% by weight of lead borosilicate glass and an appropriate quantity of solvent to formulate a screen printable thixotropic paste. A d33 of 63.5 pC/N was obtained with a combination of 4:1 ball milled to attritor milled powder by weight. The improved paste combines the high d33 values of ball and the consistency of attritor milled powder. The measured d33 coefficient was further improved to 131 pC/N by increasing the furnace firing pro-file to 100
Spectral characterisation of shortened pulse position modulation format
No full textShortened pulse position modulation (SPPM) is a new modulation format that has recently been proposed for underwater wireless optical communications. A full spectral characterisation of SPPM is considered and original expressions are presented, which are validated numerically for predicting both the continuous and discrete spectrum
N.M. JADRINTSEV AND ALTAY: RESEARCH ACTIVITIES OF THE PUBLICIST AND HIS ROLE IN THE DEVELOPMENT OF ALTAI PERIODICALS
No full textPurpose. The purpose of this article is to study the role of Nikolai Mikhailovich Yadrintseva in the course of development of the Altai periodicals and its research and statistical activities in the Altai.
Methodology. When writing the article were used General scientific methods like analysis, comparison, generalization.
Results. As a result, the author analyzed the research, ethnographic and statistical activities of Nikolai Mikhailovich Yadrintsev in the Altai. Visiting with the research mission Altai, N.M. Yadrintsev published grandiose essays and articles not only about the ethnographic side of the Altaian “aliens”, but also was able to give his inhabitants a map of the locality and a detailed description of meteorological observations. The role of N.M. Yadrintsev in the development of the Altai periodicals and gives a general description of the newspaper “Eastern Review” under his leadership. Despite the fact that publications on behalf of N.M. Yadrintsev in the Altai were not preserved, with the exception of a small quatrain, he managed to raise the provincial periodicals to a completely new level. Together with Siberian correspondents, he was able to inspire a whole generation, as a result of which universities, museums and numerous Siberian publishing houses began to develop in the cities of Siberia. With the arrival of Nikolai Mikhailovich in the Altai, the periodical press noticeably developed and strengthened.
Practical implications. The article can be used in the teaching of local history, the history of Russia and Russian journalism
Spectral characterisation of nk pulse position modulation format
No full textnk pulse position modulation (PPM) is a new modulation format that has recently been proposed for the optical wireless channel. This Letter considers, for the first time, a full spectral characterisation of -PPM and presents original expressions, which are validated numerically, for predicting both the continuous and discrete spectrum
Conflits et stratégies d’acceptabilité sociale autour des projets d’unités de méthanisation en France: Etude socio-environnementale d’une filière d’EnR en voie de consolidation
No full textCe travail étudie les formes de mobilisations s’opposant aux projets d’unités de méthanisation en France. Il cherche à comprendre les arguments des personnes et collectifs qui s’engagent dans des actions de contestation de cette énergie renouvelable (EnR). La méthodologie employée fait appel à une étude de sources combinée à des entretiens et observations. Elle s’inscrit dans une démarche RSE qui pense conjointement les questions de développement durable, de dialogue avec les parties prenantes et d’économie circulaire. Grâce à cette méthode, il devient possible de mettre en lumière des stratégies permettant de promouvoir un dialogue serein et constructif avec les collectifs mobilisés contre l’installation de nouvelles unités de méthanisation, que ce soit à l’échelle locale, régionale ou nationale. Au final, différentes pistes encourageant l’acceptabilité sociale des EnR sont suggérées
Conflits et stratégies d’acceptabilité sociale autour des projets d’unités de méthanisation en France: Etude socio-environnementale d’une filière d’EnR en voie de consolidation
No full textCe travail étudie les formes de mobilisations s’opposant aux projets d’unités de méthanisation en France. Il cherche à comprendre les arguments des personnes et collectifs qui s’engagent dans des actions de contestation de cette énergie renouvelable (EnR). La méthodologie employée fait appel à une étude de sources combinée à des entretiens et observations. Elle s’inscrit dans une démarche RSE qui pense conjointement les questions de développement durable, de dialogue avec les parties prenantes et d’économie circulaire. Grâce à cette méthode, il devient possible de mettre en lumière des stratégies permettant de promouvoir un dialogue serein et constructif avec les collectifs mobilisés contre l’installation de nouvelles unités de méthanisation, que ce soit à l’échelle locale, régionale ou nationale. Au final, différentes pistes encourageant l’acceptabilité sociale des EnR sont suggérées
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