A new synthetic route to heterobimetallic carbamato complexes and their use as precursors to nanosized magnetic oxide particles

Zusammenfassung Die vorliegende Arbeit beschäftigt sich mit der Synthese und Charakterisierung von neuen heterobimetalischen Carbamat-Komplexen und ihren chemischen Eigenschaften. CO2-Fixierung durch Insertion in die Zn-N Bindung von EtZnN(iPr)2 führt zur Bildung des tetrameren Carbamat-Komplexes [ZnEt(O2CN(iPr)2)]4, welcher in dieser Arbeit als Ausgangsverbindung eingesetzt wurde. Die thermische Zersetzung dieses Carbamat-Komplexes wurde mit verschiedenen Methoden analysiert, wobei die Untersuchungen zeigen, dass der Komplex [ZnEt(O2CN(iPr)2)]4 eine gute Vorläuferverbindung für ZnO-Nanopartikel darstellt. Die ZnO-Nanopartikel mit einer Partikelgröße von ca. 10 nm können unter milden Reaktionsbedingungen erhalten werden, wobei die Sauerstoff-Atome des Oxids aus dem CO2 stammen. Das tetramere Carbamat [ZnEt(O2CN(iPr)2)]4 wurde mit den verschiedenen Stickstoffbasen Pyridin, N,N,N',N'-Tetramethylguanidin und bis-N,N,N',N'- Tetramethylguanidinonaphthalin umgesetzt, wobei eine Vielzahl neuer mono-, biund trinuklearer Zn-Carbamat-Komplexe erhalten werden konnte. Der erste strukturell charakterisierte mononukleare Zn-Biscarbamat-Komplex mit η1-koordinierten Carbamat-Liganden entstand bei der Reaktion von [ZnEt(O2CN(iPr)2)]4 und einer Guanidin-Base. Die Reaktion von [ZnEt(O2CN(iPr)2)]4 mit Co(II)- und Mn(II)-dichlorid-Komplexen, welche 2-(Methylamino)pyridin als weiteren Ligand enthalten, führt zu neuen tetraund oktanuklearen gemischten Zn/Co und Zn/Mn Carbamat-Komplexen. Im Fall von Kobalt entstanden tetranukleare ([M4R2(O2CN(iPr)2)6] (M =Zn, Co; R = Et, Me)) und oktanukleare Komplexe ([M8(my4-O)2(O2CN(iPr)2)6] (M =Zn, Co)), während mit Mn der oktanukleare Komplex [Zn2Mn6(my4-O)2(O2CN(iPr)2)6] gebildet wurde. Bei der Oxidation des oktanuklearen Zn/Mn-Komplexes [Zn2Mn6(my4-O)2(O2CN(iPr)2)6] mit Sauerstoff entsteht der neue Komplex [Zn2Mn6(my4-O)2(my3-O)(O2CN(iPr)2)6]. Die thermische Zersetzung der gemischten Zn/Co und Zn/Mn Carbamat-Komplexe unter milden Bedingungen (200-300°C) führt zu magnetischen gemischten Oxid-Nanopartikeln

EMERGENCY STATUS MANAGEMENT IN ENERGETIC FIELD . RISK TRANSFER

The state of emergency in the energy sector generates technical problems such as: disruption in the operation of machinery and equipment, replacement of equipment or others needs. Besides the technical problems which appear, also intervene economic and financial issues that generate costs for the replacement of machines, equipment and installations and expenses of compensation to third parties who have suffered losses by disconnecting the power supply or lack of electricity over a longer or shorter period. Modern methods of risk management include also economic solutions. Some of these solutions will be treated in this paper

ON THE COMPUTATION OF ELECTRICAL RESISTANCE OF HYDRODYNAMIC JOURNAL BEARING

The paper approaches the mathematical model of electrical resistance of hydrodynamic journal bearing under different parameters of operation so as to predict bearing performance and safe load carrying capacity. The currents circulating in the journal bearing of electrical machine causes reducing of lifespan by appearance of pitting on their surface and the degradation of the lubricant. In a hydrodynamic journal bearing, the zone of minimum film thickness, load-carrying oil film varies along the circumference of a bearing through its length. This has been found to form a capacitor of varying capacitance between the journal and the bearings dependent on permittivity of the lubricant used, the bearing length, the eccentricity ratio and the clearance ratio. Besides this, load-carrying on oil film offers resistance that depends on operating parameters and resistivity of the lubricant

1,8-Bis(silylamido)naphthalene complexes of magnesium and zinc synthesized through alkane elimination reactions

The reactions between magnesium or zinc alkyls and 1,8-bis(triorganosilyl)diaminonaphthalenes afford the 1,8-bis(triorganosilyl)diamidonaphthalene complexes with elimination of alkanes. The reaction between 1,8-C10H6(NSiMePh2H)2 and one or two equivalents of MgnBu2 affords two complexes with differing coordination environments for the magnesium; the reaction between 1,8-C10H6(NSiMePh2H)2 and MgnBu2 in a 1:1 ratio affords 1,8-C10H6(NSiMePh2)2{Mg(THF)2} (1), which features a single magnesium centre bridging both ligand nitrogen donors, whilst treatment of 1,8-C10H6(NSiR3H)2 (R3 = MePh2, iPr3) with two equivalents of MgnBu2 affords the bimetallic complexes 1,8-C10H6(NSiR3)2{nBuMg(THF)}2 (R3 = MePh2 2, R3 = iPr3 3), which feature four-membered Mg2N2 rings. Similarly, 1,8-C10H6(NSiiPr3)2{MeMg(THF)}2 (4) and 1,8-C10H6(NSiMePh2)2{ZnMe}2 (5) are formed through reactions with the proligands and two equivalents of MMe2 (M = Mg, Zn). The reaction between 1,8-C10H6(NSiMePh2H)2 and two equivalents of MeMgX affords the bimetallic complexes 1,8-C10H6(NSiMePh2)2(XMgOEt2)2 (X = Br 6; X = I 7). Very small amounts of [1,8-C10H6(NSiMePh2)2{IMg(OEt2)}]2 (8), formed through the coupling of two diamidonaphthalene ligands at the 4-position with concomitant dearomatisation of one of the naphthyl arene rings, were also isolated from a solution of 7

PRACTICAL APPLICATION WITH PLC IN MANIPULATION OF A ROBOTIC ARM

This paper presents the use of a robotic arm PLC Siemens in order not using CNC commands. This is done by programming the PLC ladder diagram language that makes movement on the three axes of the arm by means of stepper motors. Required command console PLC is built with the help of a touch screen HMI Weintek. In the user interface are introduced distances and displacement speeds on the three axes

TVB-EduPack: An interactive learning and scripting platform for The Virtual Brain

The Virtual Brain (TVB; thevirtualbrain.org) is a neuroinformatics platform for full brain network simulation based on individual anatomical connectivity data. The framework addresses clinical and neuroscientific questions by simulating multi-scale neural dynamics that range from local population activity to large-scale brain function and related macroscopic signals like electroencephalography and functional magnetic resonance imaging. TVB is equipped with a graphical and a command-line interface to create models that capture the characteristic biological variability to predict the brain activity of individual subjects. To enable researchers from various backgrounds a quick start into TVB and brain network modeling in general, we developed an educational module: TVB-EduPack. EduPack offers two educational functionalities that seamlessly integrate into TVB's graphical user interface (GUI): (i) interactive tutorials introduce GUI elements, guide through the basic mechanics of software usage and develop complex use-case scenarios; animations, videos and textual descriptions transport essential principles of computational neuroscience and brain modeling; (ii) an automatic script generator records model parameters and produces input files for TVB's Python programming interface; thereby, simulation configurations can be exported as scripts that allow flexible customization of the modeling process and self-defined batch- and post-processing applications while benefitting from the full power of the Python language and its toolboxes. This article covers the implementation of TVB-EduPack and its integration into TVB architecture. Like TVB, EduPack is an open source community project that lives from the participation and contribution of its users. TVB-EduPack can be obtained as part of TVB from thevirtualbrain.org

Brain simulation as a cloud service: The Virtual Brain on EBRAINS

The Virtual Brain (TVB) is now available as open-source services on the cloud research platform EBRAINS (ebrains.eu). It offers software for constructing, simulating and analysing brain network models including the TVB simulator; magnetic resonance imaging (MRI) processing pipelines to extract structural and functional brain networks; combined simulation of large-scale brain networks with small-scale spiking networks; automatic conversion of user-specified model equations into fast simulation code; simulation-ready brain models of patients and healthy volunteers; Bayesian parameter optimization in epilepsy patient models; data and software for mouse brain simulation; and extensive educational material. TVB cloud services facilitate reproducible online collaboration and discovery of data assets, models, and software embedded in scalable and secure workflows, a precondition for research on large cohort data sets, better generalizability, and clinical translation

DANZA URBANA

Trabajo Fin de Grado leído en la Universidad Rey Juan Carlos en el curso académico 2023/2024. Directores/as: Alfonso Palazón MeseguerDocumental biográfico acerca de la danza urbana y el lado que no sé ve, aquello que no te cuentan. Nos adentramos en la reflexión de la mano de Luna Mena en "Luna Mena, A través de la Danza"