bluuebunny/crossref_metadata_2025_split huggingface dataset:
Equation of Motion and Radiation damping for a relativistic charged particle
Authors: Hénin Françoise 
Published: April 2023

I. Prigogine et l'auteur ont publié, récemment, une généralisation relativiste de la théorie de l'électron étendu de Sommerfeld. L'équation du mouvement qu'ils ont obtenue est étudiée dans le cas du mouvement à une dimension. L'élimination des solutions non physiques de l'équation de Lorentz Dirac et l'existence de solutions self oscillantes sont discutées.
Nous calculons ensuite l'énergie rayonnée par la particule soumise à l'action d'un champ extérieur oscillant d'amplitude faible en fonction de la fréquence et comparons les résultats obtenus à ceux de la théorie de Lorentz-Dirac et de la théorie non locale de Peierls-McManus. Les différences entre les trois théories apparaissent clairement aux grandes fréquences et sont liées aux hypothèses différentes sur la structure de la particule. L'effet des termes non linéaires de l'équation du mouvement de notre théorie est étudié dans le cas d'une force extérieure constante ; ces termes conduisent à l'introduction d'une masse effective dépendant de l'accélération.
Comparaison entre les effets de l'impact électronique sur le benzène et sur les isomères du benzène en chaîne ouverte
Authors: Momigny Jacques , Brakier-Gingras Léa , Or Louis d' 
Published: April 2023

In order to get more information about the behaviour of the benzene molecule under electron impact, five open chain isomers of this molecule have been synthetized (the four hexadiynes and the butadienylacetylene) .
A comparative study of their mass spectra and of the enthalpies of formation of some common ions has been carried out.
This work resulted in the very close similarity found between the mass spectra of benzene and of the only butadienylacetylene. This similarity suggests that our previous hypothesis about the occurrence of an open chain ion as an intermediary step in the decomposition of the benzene molecule under electron impact is strongly reinforced.
Isomerization of the benzene ion into the butadienylacetylene ion is on the other hand supported by the existence of an electronic state of the benzene ion at 10.3 volts, recently discovered by photoionization, and consistent with the heat of isomerization we have calculated from the enthalpies of formation measured in both substances for C6H6+ in its ground state.
This research enables us also to decide that, not only C6H6+ in any excited state but also C6H5+ and C6H4+ in their ground states, deriving from benzene, are not cyclic but linear.
Sur l'effet pelliculaire dans un barreau cylindrique de section quelconque, en basse fréquence
Authors: Beaufays Oscar 
Published: April 2023

On considère un barreau cylindrique conducteur de section quelconque traversé par un courant fonction périodique du temps.
On détermine la résistance et la self du barreau lorsque la fréquence du courant est faible au point qu'on peut négliger les effets de propagation.
Les résultats sont valables que le courant varie sinusoïdalement ou non.
On particularise les résultats à quelques cas simples : section circulaire, elliptique, rectangulaire.
Sur quelques aspects pratiques de la théorie des accélérations réduites d'ordre quelconque
Authors: Mangeron Démètre J. , Croitoru Hélène 
Published: April 2023

Dans une série de notes antérieures, élaborées par l'un des auteurs seul ou bien en collaboration [3]-[12], basées sur la théorie des accélérations réduites d'ordre quelconque, définies par [1]-[3] pour la cinématique plane et par [5]-[7] ou bien [12] pour la cinématique de l'espace, on a étudié le problème des champs d'accélérations. On a appliqué ensuite les résultats acquis à l'étude des mouvements des mécanismes plans et des groupes d'Assour les plus généraux.
Après avoir donné ci-dessous les définitions des accélérations réduites d'ordre et d'espèce quelconques concernant les mouvements des chaînes des solides rigides et avoir énoncé nombre de théorèmes relatifs à ce sujet, on indique comme application quelques procédés de la méthode des accélérations réduites d'ordre quelconque qui s'en est montrée assez utile dans la résolution systématique du problème des distributions des accélérations dans différents organes des mécanismes et des machines.
A Thermodynamic Approach to Stability Problems
Authors: Strieder William 
Published: April 2023

Les travaux récents de P. Glansdorff et T. Prigogine permettent d'étendre le domaine d'application de la Thermodynamique des Phénomènes Irréversibles aux processus loin de l'équilibre et incluant l'effet de grandeurs hydromagnétiques.
L'objet de ce travail est de présenter l'inégalité fondamentale de Glansdorff et Prigogine pour un système en présence de champs électromagnétiques. La production d'entropie généralisée est calculée pour des problèmes de stabilité hydromagnétique. Cette production d'entropie s'exprime comme d'habitude en termes de flux et de forces généralisées. Son signe donne directement la stabilité du système par rapport à de petites perturbations dans le cadre d'une théorie linéaire. L'auteur étudie la relation entre les principes variationnels usuels de la Théorie de la Stabilité et la production d'entropie généralisée.
A titre d'application le problème de l'instabilité thermique d'une couche liquide par rapport à la convection est étudié dans le cas hydromagnétique.
Métabolisme du tréhalose et du glycogène chez le Ver à soie, en relation avec la mue, le filage et les métamorphoses
Authors: Florkin Marcel , Jeuniaux Charles 
Published: April 2023

In the silkworm, as is the case in most other insects, trehalose is the principal circulating form of the saccharidic cellular food. The hemolymph contains an enzyme, trehalase, which is normally inhibited. The inhibition is only suppressed during the periods of molting, causing a decrease of the trehalose concentration and an increase of the amount of free glucose.
The muscles and most other tissues, such as the digestive tract, are able to use blood trehalose, thanks to an intracellular trehalase. The epidermis and the silk-glands are devoid of trehalase : they use the free glucose liberated by the hydrolysis of the hemolymph trehalose during the periods of molting and spinning.
The problem of the origin of the trehalose is discussed, in the light of recent experiments, in which the incorporation of radioactivity from labelled pyruvate and glucose-1-phosphate into fat-body glycogen and hemolymph trehalose has been followed.
The chitin of the cuticle is synthesized at every molting process, partly at the expense of the glucose liberated by the hydrolysis of the trehalose in the hemolymph. On the other hand, the old cuticle is destroyed by the proteolytic and chitinolytic enzymes of the exuvial fluid. The hydrolytic products, especially N-acetylglucosamine, are resorbed by the epidermis and can be used for the biosynthesis of the chitin of the new cuticle.
Mise en évidence d'une relation quantitative entre la synthèse des anticorps et celle des γ-globulines non spécifiques impliquée par la théorie de Burnet sur l'origine de la spécificité des anticorps
Authors: Valette-Robin Y. , Dupont-Mairesse N. , Jeener Raymond 
Published: April 2023

1. The quantities of γ-globulins secreted in vitro by fragments of spleen, synthesized in vivo by lymph node cells during short periods, or secreted in the blood by the entire immune system of rabbits hyperimmunized against tobacco mosaic virus or the flagellae of Salmonella paratyphi have been studied by incorporation of [3H] phenylalanine. In each case the quantities of [3H] phenylalanine simultaneously incorporated into the antibodies and into the non specific γ-globulins have been found to be equal.
2. It is proposed that all antibody producing cells synthesize equal quantities of antibody and of non specific γ-globulin.
Such a parallelism might been expected if the clonal selection theory of antibody production proposed by Burnet is correct. Other interpretations are discussed.
Ionisation et dissociation de l'éthane sous l'impact électronique. Spectres de masse et phénomènes d'échange dans C2H0, C2H5D, CH3CD3 et C2D6
Authors: Or Louis d' , Collin Jacques E. , Longrée D. 
Published: April 2023

Summary. — The mass spectra and appearance potentials of C2H6, C2H5D, CH3CD3 and C2D6 have been measured, in order to study the dissociation processes of ethane under electron impact.
Special attention has been drawn on the exchange phenomena occurring between hydrogen and deuterium in CH3CD3. This exchange makes difficult the study of dissociation processes. Two theoretical explanations have been previously given for the exchange phenomena, and their relative merits for the interpretation of the exchange mechanisms in ethane are discussed. Appearance potentials show that the activation energy of exchange is small. Some experimental data suggest that the rate of exchange in CH3CD3+ could be higher than 1015 sec-1 and lower than 1020 sec-1, and that exchange might also happen in fragment ions such as CH2CD2+.
Some isotope effects resulting from the substitution of hydrogen by deuterium have been observed.
Calcul du coefficient de débit de quelques tuyères débitant en atmosphère illimitée (2e note)
Authors: Jaumotte André Louis , Hirsch Charles 
Published: April 2023

Dans une note antérieure (*), nous avons considéré trois tuyères débitant en atmosphère illimitée et nous avons déterminé leur coefficient de débit par le calcul de l'épaisseur de quantité de mouvement relative à la couche limite dans la section finale, pour la répartition de pression à la paroi correspondant à un écoulement par tranches parallèles. Le calcul était limité au domaine laminaire de la couche limite (Red < 1 à 1,2 105). La confrontation avec l'expérience avait montré un excellent accord.
Dans la présente note, la même méthode de calcul est employée, mais la répartition de pression à la paroi est celle correspondant à un écoulement de révolution à potentiel, obtenue à partir de mesures à la cuve rhéoélectrique. Cette répartition est plus proche de la réalité.
L'épaisseur de déplacement de la couche limite est un peu plus élevée que pour l'écoulement par tranches parallèles et par conséquent le coefficient de débit est un peu plus faible. Les écarts restent minimes.
Variational formulation of nonlinear differential equations (I)
Authors: Tonti Enzo 
Published: April 2023

This paper gives a self-sufficient treatment of the problem of knowing when a nonlinear equation or a system of nonlinear equations admits a variational formulation and how to find the corresponding functional.
The paper is divided into two parts that will be published separately : the first part deals with the general theory whereas the second part deals with rules for practical application and gives a number of examples.
Poète, prends ton luth
Authors: Leduc Jacques 
Published: April 2023

Duparc, Fauré, Debussy, Boulez,... and facing them, Baudelaire, Verlaine, Maeterlinck, Char, ... What are the thoughts processes of the ones and the others ? How does poetry inspire musicians ? And what are their contributions to the poets ?
The text above sheds light on these questions and their sometimes sharp asides.
Le théâtre liégeois de Jean-Noël Hamal, feu d'artifice ou comète périodique ?
Authors: Quitin José 
Published: April 2023

The Liegeois Theater is a set of four operas composed in 1757-1758 by Jean-Noël Hamal (Liège 1709-1778), singing master at the Liege Cathedral, on libretti in Walloon dialect due to four aristocrats of the country. They took the operas buffas in Napolitan dialect by Pergolesi and Latilla as models, but introduced into them such modern tendencies as truthfulness, naturalness, actuality of theme called by Diderot for the French theater about 1750.
Faithful to his Italian patterns, Hamal uses recitativo secco, aria da capo and ensembles at the end of an act, all of them being accompanied by a simple string quartet. On occasion pastiches of Parisian sentimental songs and ariettes, but also real tunes in the French fashion are inserted into the theatrical action.
The success of the Liegois Theater was abruptly annihilated by that of the new opera with spoken dialogue precisely in 1769 after the first performance in liège of Le Huron by Grétry (Liège 1741-Montmorency 1813). Yet, just like a recurrent comet, it reappears on playbills for the greatest enjoyment of those who love the lyrical dialect theater.
Le patrimoine architectural : enjeu du défi de l'ère post-industrielle
Authors: Barthélémy Jean 
Published: April 2023

Putting an end to this era of pollution and enslavement in human history and successfully bringing the worlds of computer science and craftsmanship to live together in perfect harmony - those two poles of technology being equally indispensable to the quality of human life - this is definitely our challenge for the future.
The architectural and urbanistic heritage is thoroughly involved in this challenge. It is essential to protect it and to adapt it to our times in order to prepare a world which will again aspire to foster that extraordinary asset for the human species which the diversity of its cultures and the impressive extent of its geographical features represent.
Franz Liszt, un virtuose «mal assis»
Authors: Wangermée Robert 
Published: April 2023

The 1830s were a golden age of instrumental virtuosity. With the end of the Ancien Régime, musicians -composers and players alike - were no longer the paid servants of princes or the Church. They had acquired their freedom, but the need to earn a living often led them to produce music which pandered to the tastes of an audience which now included new layers of the bourgeoisie, and to sell it like merchandise.
Franz Liszt, one of the most illustrious of these virtuosi, was torn between the desire to affirm himself as the greatest virtuoso of his day and the wish to win recognition from the intelligentsia of philosophers, poets, painters and innovative composers (Berlioz, Schumann,...) as a successor to Beethoven.
His «cultural» aspirations are expressed in several series of articles inspired variously by Saint-Simon, Lamennais and Ballanche. In them, he presents a lucid criticism of the musical institutions, the lyrical theatres, concerts and music teaching of his time, and sets out proposals for reform.
What is ambiguous in Liszt's attitude is that, for all this, he did not renounce his ambitions as a piano athlete. These contratst did not fail to strike lucid minds, provoking in particular the irony of Heinrich Heine, who saw in him a pianist "badly seated" between contradictory options, and ill at ease with his success as a virtuoso. It was only from 1847 onwards, as Kapellmeister of the Duke of Weimar, that Liszt escaped form the temptations of commercializing his art. However, with artists having lost their clearly defined social function, he was no longer a paid musician-servant as under the Ancien Régime.
From that time on, it was clear that music which wanted to escape from market constraints could survive only by subsidies and support from public or private benefactors. 1847 onwards, as Kapellmeister of the Duke of Weimar, that Liszt escaped form the temptations of commercializing his art. However, with artists having lost their clearly defined social function, he was no longer a paid musician-servant as under the Ancien Régime.
From that time on, it was clear that music which wanted to escape from market constraints could survive only by subsidies and support from public or private benefactors.
Franz Liszt au Pays de Liège
Authors: Quitin José 
Published: April 2023

Combining information from Liszt's correspondence and contemporary newspapers, Quitin shows the virtuoso leaving to conquer Belgium in 1841. Quitin accords particular attention to Franz Liszt's «Liège» performances of 13, 19 and 24 February and 11 October 1841, and of 17 and 20 July 1842 (inauguration of the statue of Grétry), to his performance at Spa on 20 August 1845 (on his way back from the inauguration of the Beethoven monument in Bonn on 15 August), and his unscheduled participation on 28 January 1846 at the Liège Musical Society's charity concert. The difficulties aroused by the practical organization of these concerts and the reactions of the audience and of Liszt himself are evoked in a number of often unpublished documents. Similarly, in the programmes, we perceive the evolution of the virtuoso's musical concepts shortly before setting up in Weimar.
Franz Liszt was not to return to Liège until 40 years later, to attend a monumental concert of his work offered to him by the Société Libre d'Émulation on 27 March 1886, and conducted by Eugène Hutoy (Liège 1844-1889). The triumphantly successful performance of his Messe de Gran was a prelude to its triumph in Paris on 25 March. 17 and 20 July 1842 (inauguration of the statue of Grétry), to his performance at Spa on 20 August 1845 (on his way back from the inauguration of the Beethoven monument in Bonn on 15 August), and his unscheduled participation on 28 January 1846 at the Liège Musical Society's charity concert. The difficulties aroused by the practical organization of these concerts and the reactions of the audience and of Liszt himself are evoked in a number of often unpublished documents. Similarly, in the programmes, we perceive the evolution of the virtuoso's musical concepts shortly before setting up in Weimar.
Franz Liszt was not to return to Liège until 40 years later, to attend a monumental concert of his work offered to him by the Société Libre d'Émulation on 27 March 1886, and conducted by Eugène Hutoy (Liège 1844-1889). The triumphantly successful performance of his Messe de Gran was a prelude to its triumph in Paris on 25 March.
Les cent cinquante ans de la Classe des Beaux-Arts
Authors: Colman Pierre 
Published: April 2023

The President of the Academie thanks their Majesties the King and the Queen for their presence today. He reminds those present that the King is the Protector of the Academie.
The anniversary which we are celebrating today is not that of the creation of this venerable institution, but that of its reorganization, when the Fine Arts class was added to those of Science and of Literature.
The balance sheet of 150 years of activity by the class whose anniversary we are celebrating is an attractive one. Its members have included Adolphe Quételet, the Leonardo da Vinci of the Jeune Belgique movement, James Ensor and Paul Delvaux, to mention just three. It has published abundantly, including the catalogues of two memorable exhibitions. It is benefited from the gifts of a host of benefactors. It has awarded a quantity of prizes and subsidies.
The whole Académie is very concerned to preserve its independence vis-à-vis the powers which command this world. In all circumstances it upholds intelligence, sensitivity and creativity, the cult of Truth, Beauty and Goodness. Its vocation is to reward merit. It is resolutely elitist, but in no ways haughty. It is not afraid to descend into the arena. The palace in which it lives is a large house of noble appearance, but it is no ivory tower, no fortress. Symbolically it bears comparison with a lighthouse.
Living Chinese Herbal Scaffolds from Microfluidic Bioprinting for Wound Healing
Authors: Wang Xiaocheng , Jia Jinxuan , Niu Mengying , Li Wenzhao , Zhao Yuanjin 
Published: April 2023

Biological scaffolds have been widely employed in wound healing applications, while their practical efficiency is compromised by insufficient oxygen delivery to the 3-dimensional constructs and inadequate nutrient supply for the long-term healing process. Here, we present an innovative living Chinese herbal scaffold to provide a sustainable oxygen and nutrient supply for promoting wound healing. Through a facile microfluidic bioprinting strategy, a traditional Chinese herbal medicine (Panax notoginsengsaponins [PNS]) and a living autotrophic microorganism (microalgaeChlorella pyrenoidosa[MA]) were successfully encapsulated into the scaffolds. The encapsulated PNS could be gradually released from the scaffolds, which promoted cell adhesion, proliferation, migration, and tube formation in vitro. In addition, benefiting from the photosynthetic oxygenation of the alive MA, the obtained scaffolds would produce sustainable oxygen under light illumination, exerting a protective effect against hypoxia-induced cell death. Based on these features, we have demonstrated through in vivo experiments that these living Chinese herbal scaffolds could efficiently alleviate local hypoxia, enhance angiogenesis, and thereby accelerate wound closure in diabetic mice, indicating their great potential in wound healing and other tissue repair applications.
Kinerja Pozzolan Glasspowder Pada Karakteristik Mekanis dan Fisis Paving Blok Geopolimer
Authors: Sofyan Muhammad , Dasar Amry , Okvianti Irlan Ade , Wirantina K Irma , Ageng Kinasti Rr Mekar , Sujanes Velizar , Amiruddin Aswar 
Published: April 2023

Fly ash merupakan salah satu bahan pozzolan yang diperoleh dari limbah hasil pembakaran batu bara. fly ash pada dasarnya tidak memiliki kemampuan mengikat seperti semen portland. Dibutuhkan larutan aktivator agar fly ash dapat memiliki daya ikat seperti semen portland. Selain fly ash, limbah kaca dari industri maupun rumah tangga dapat diolah untuk dapat dimanfaatkan sebagai material yang dapat memperbaiki kinerja bahan geopolimer karena mengandung senyawa silica (SiO2) dan zat kapur (CaO) yang cukup signifikan. Penelitian berfokus pada glass powder yang digunakan sebagai subtitusi fly ash pada paving blok geopolimer dengan persentase 0%, 15%, 30%, 45% dan 60%. Kinerja paving blok diuji berdasarakan kuat tekan dan penyerapan air. Pengujian dilakukan pada saat sampel berumur 7 hari. Hasil penelitian menunjukan bahwa nilai kuat tekan optimum terdapat pada paving block geopolymer dengan variasi glass powder 15% dan fly ash 85% yaitu 30,67 MPa yang termasuk paving block mutu B. Penyerapan air terendah terdapat pada paving block geopolymer variasi glass powder 15%, paving block yang dihasilkan pada penelitian ini adalah paving block dengan mutu B.
Perovskite quantum dots with potassium oleate ligands for light-emitting diode applications
Authors: Morikawa Yusaku , Sato Ryota , Oshita Naoaki , Kimura Taisei , Yoshida Kenshin , Goto Mao , Asakura Satoshi , Kashiwagi Motofumi , Masuhara Akito 
Published: April 2023

Abstract
Lead tri-halide perovskite quantum dots (PeQDs) have attracted attention as a light source such as LEDs. However, this causes a decrease in not only their dispersibility but also photoluminescence quantum yield (PLQY), which is one of the factors for external quantum efficiency (EQE) of LEDs when the ligand as an insulating component is removed. Herein, we proposed a strategy to prepare PeQDs, which selectively coordinated potassium oleate on the surface of PeQDs. As a result, PeQDs were successfully prepared, while maintaining the dispersibility and high PLQY after removing the ligands and achieving improved EQE.