480 research outputs found
Government Response to Political Activism: Conflict between the Public and the State, Genoa 2001
Protests represent an extremely delicate issue for governments and authorities in terms of security and democracy. Most recently in the last decade, demonstrations have acquired a global and international characterisation, rendering these trans-national phenomena. This research is a case study which aims to contribute to the political development of Italy by analysing the policies in relation to the management of protests by using theoretical frameworks drawn from fields of social and political sciences such as Public Policy and Peace and Conflict studies. The goal of this research is to analyse events in a broader picture, investigating democratic values and state response to social movements such as protests. In other words, it seeks to answer the following questions: How was the government response conceived and what impact did this have on state values of security, democracy and justice? Considering comparable cases, what was the impact in terms of policy and practice of these strategies? How can public policy theories of social construction help to explain the government response and thus contribute to prevention of such violence in future
Strong Exchange Couplings Drastically Slow Down Magnetization Relaxation in an Air‐Stable Cobalt(II)‐Radical Single‐Molecule Magnet (SMM)
The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four‐coordinate cobalt(II) building block into a strongly coupled fully air‐ and moisture‐stable three‐spin system, it proved possible to suppress under‐barrier Raman processes leading to 350‐fold increase of magnetization relaxation time and pronounced hysteresis. Relaxation times of up to 9 hours at low temperatures were found
Direct Observation of Quantum Coherence in Single-Molecule Magnets
Direct evidence of quantum coherence in a single-molecule magnet in frozen
solution is reported with coherence times as long as T2 = 630 ns. We can
strongly increase the coherence time by modifying the matrix in which the
single-molecule magnets are embedded. The electron spins are coupled to the
proton nuclear spins of both the molecule itself and interestingly, also to
those of the solvent. The clear observation of Rabi oscillations indicates that
we can manipulate the spin coherently, an essential prerequisite for performing
quantum computations.Comment: 5 Pages, 4 Figures, final version published in PR
(Electro)catalytic C-C bond formation reaction with a redox-active cobalt complex
Cooperativity between cobalt and non-innocent ligands in electron transfer
processes has been utilized for (electro)catalytic C–C bond formation
reactions
Facile Synthesis and Characterization of Pure Tochilinite‐like Materials from Nanoparticulate FeS
Abstract In this work, three different tochilinite‐like materials have been obtained by sophisticated synthetic methods that allow to control the distribution of iron ions. The purity of the samples was confirmed by powder X‐ray diffraction. From elemental analysis and Mössbauer spectroscopy data, detailed compositions could be determined: T1) Fe 0.76 S*0.86 [Fe 2+ 0.01 Fe 3+ 0.56 Mg 2+ 0.43 (OH) 2.01 ]; T2) Fe 0.89 S*0.85 [Fe 2+ 0.55 Fe 3+ 0.11 Al 3+ 0.33 (OH) 1.84 (O) 0.16 ]; T3) Fe 0.71 S*0.79 [Fe 2+ 0.25 Fe 3+ 0.73 Mg 2+ 0.01 Al 3+ 0.01 (OH) 1.98 (O) 0.02 ]. These compositions fit to typical compositions of tochilinite in regard of the amount of iron vacancies and the volume ratio of the hydroxide layers to the sulfide layers. Besides hydroxide ions, oxide ions are also present in the hydroxide layers as a result of surface oxidation after the synthesis due to the high reactivity of the particles. TEM and SEM investigations show that the obtained powders consist mainly of thin sheets accompanied by nanotubes with BET surface areas ranging between 20 m 2 /g and 40 m 2 /g. The thermal stability was investigated by TGA and DSC analysis and it depends significantly on the composition.imag
From There to Here: Evaluating the Transition of an International Advanced Pharmacy Practice Experience in London
Purdue University College of Pharmacy offers an international advanced pharmacy practice experience (APPE) in London, England, where student pharmacists have the opportunity to work with pharmacy specialists at St. Bartholomew’s Hospital. The COVID-19 pandemic has significantly impacted travel across the world and created the need to transition this experience from in-person to virtual.
Virtual interaction with international preceptors and revised research and clinical activities can provide students with a valuable learning experience
Probing bistability in FeII and CoII complexes with an unsymmetrically substituted quinonoid ligand
The generation of molecular platforms, the properties of which can be
influenced by a variety of external perturbations, is an important goal in the
field of functional molecular materials. We present here the synthesis of a
new quinonoid ligand platform containing an [O,O,O,N] donor set. The ligand is
derived from a chloranilic acid core by using the [NR] (nitrogen atom with a
substituent R) for [O] isoelectronic substitution. Mononuclear FeII and CoII
complexes have been synthesized with this new ligand. Results obtained from
single crystal X-ray crystallography, NMR spectroscopy,
(spectro)electrochemistry, SQUID magnetometry, multi-frequency EPR
spectroscopy and FIR spectroscopy are used to elucidate the electronic and
geometric structures of the complexes. Furthermore, we show here that the spin
state of the FeII complex can be influenced by temperature, pressure and light
and the CoII complex displays redox-induced spin-state switching. Bistability
is observed in the solid-state as well as in solution for the FeII complex.
The new ligand presented here, owing to the [NR] group present in it, will
likely have more adaptability while investigating switching phenomena compared
to its [O,O,O,O] analogues. Thus, such classes of ligands as well as the
results obtained on the reversible changes in physical properties of the metal
complexes are likely to contribute to the generation of multifunctional
molecular materials
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