R. Abraham b. David aus Posquières : ein literarhistorischer Versuch

Heinrich Gross

R. Abraham b. David aus Posquières : ein literarhistorischer Versuch

Heinrich Gross

R. Abraham b. David aus Posquières : ein literarhistorischer Versuch

Heinrich Gross

R. Abraham b. David aus Posquières : ein literarhistorischer Versuch

Heinrich Gross

A new boundary condition solved with B.I.E.M.

Among the classical operators of mathematical physics the Laplacian plays an important role due to the number of different situations that can be modelled by it. Because of this a great effort has been made by mathematicians as well as by engineers to master its properties till the point that nearly everything has been said about them from a qualitative viewpoint. Quantitative results have also been obtained through the use of the new numerical techniques sustained by the computer. Finite element methods and boundary techniques have been successfully applied to engineering problems as can be seen in the technical literature (for instance [ l ] , [2], [3] . Boundary techniques are especially advantageous in those cases in which the main interest is concentrated on what is happening at the boundary. This situation is very usual in potential problems due to the properties of harmonic functions. In this paper we intend to show how a boundary condition different from the classical, but physically sound, is introduced without any violence in the discretization frame of the Boundary Integral Equation Method. The idea will be developed in the context of heat conduction in axisymmetric problems but it is hoped that its extension to other situations is straightforward. After the presentation of the method several examples will show the capabilities of modelling a physical problem.

Programa de historia y elementos de D[e]r[ech]o Civil español común y foral [Manuscrito] : en el curso de 1873 á 1874

El texto comienza a mitad de la lección 7ª

EMPRESA, victorias y desgracias de el Principe Carlos Eduardo Stuard, pretendiente de Inglaterra... [Texto impreso]

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Reductive electrochemical formation of 6H-dibenzo[b,d]pyran-6-one and 2-benzopyran-1(1H)-one

In the present Letter several carbolactones (oxidative products) are obtained under aprotic cathodic conditions in the preparative scaled electrolysis of 1,2-quinones in a divided electrochemical cell and in the presence of oxygen. When 9,10-phenanthrenequinone is reduced 6H-dibenzo[b,d]pyran-6-one and [1,1′-biphenyl]-2,2′-dicarboxylic acid are obtained as major products. In the reduction of 1,2-naphthoquinone, 2-benzopyran-1(1H)-one, and 2-(2-carboxyethenyl)-benzoic acid were formed as main products. The proposed mechanism to explain the formation of these and other products, that involves an electron-transfer reaction to the oxygen in air, is now discussed.

Palladium nanoparticles supported on graphene and reduced graphene oxide as efficient recyclable catalyst for the Suzuki–Miyaura reaction of potassium aryltrifluoroborates

Palladium nanoparticles supported on graphene platelets have been efficiently used as catalyst in the Suzuki–Miyaura coupling between aryl bromides and potassium aryltrifluoroborates using 0.1 mol% of Pd and potassium carbonate as base in MeOH/H2O as solvent at 80 °C. The reaction can be performed using conventional and microwave heating showing the catalyst high reusability, particularly with microwaves, where lower aggregation of Pd nanoparticles has been observed. A dissolution/re-deposition catalytic mechanism is proposed, based on the fact that palladium leaching to the solution is detected under microwave irradiation.

al- Taʻrīb��t al-shāfiyah li-murīd al-jughrāfiyah

Rifāʻah Badawī Rāfiʻ al-Ṭahṭāwī.

Kitāb Manāhij al-alb��b al-Miṣrīyah fī mab��hij al-ādāb al-ʻaṣrīyah

taʼlīf Rifāʻah Rāfiʻ.

Kitāb Maṭālib ahl al-qurbah fī sharḥ duʻāʼ Ab�� Ḥarbah / taʼlīf al-Shaykh al-ʻĀlim al-ʻĀmil al-ʻAllāmah al-Muḥaqqiq al-Mudaqqiq al-Fahhāmah al-Sayyid Badr al-Dīn Ḥusayn ibn al-Sharīf ʻAbd al-Raḥmān ibn Muḥammad ibn ʻAlī al-Ahdal : manuscript, 1714

Foliated 1-442. Missing f. 441.

Marx y Bakunin : la Primera Internacional, 1864-1873 /

Mode of access: Internet.

Zenon papyri; business papers of the third century B.C. dealing with Palestine and Egypt,

Vol. 2 cite as: P.Col. IV

Huwa hādhā kitāb Mashāriq al-aḥkām /

Caption title.