209 research outputs found
Organisation und Profession Sozialer Arbeit: Kognitive Vermittlungsprozesse:Eine neo-institutionalistische Betrachtung
Das VerhĂ€ltnis von Profession und Organisation Sozialer Arbeit wird aus einer â innerhalb des sozialpĂ€dagogischen Diskurses bis dato kaum beachteten â innovativen Perspektive, dem neo-institutionalistischen Ansatz, in den Blick genommen. Dabei stellt der familiale Wandel, der sich seit Mitte des 20. Jahrhunderts ereignet hat, den Ausgangspunkt dieser Ăberlegungen dar, welche den Einfluss der professionellen Thematisierung dieser familialen Transformationsprozesse auf die organisationale Praxis fokussieren. Es werden die Grundlagen des Neo-Institutionalismus und die sozialpĂ€dagogische Professionstheorie dargelegt, um die organisations- mit der professionstheoretischen Dimension zu verknĂŒpfen. Auf diese Weise erfolgt eine Erweiterung des professionstheoretischen Zugangs auf der Hintergrundfolie des Neo-Institutionalismus. Auf Basis von Expert_inneninterviews wird eine empirische Analyse der theoretischen AusfĂŒhrungen, beispielhaft an der SozialpĂ€dagogischen Familienhilfe, vorgenommen. <br/
Controllable manipulation and detection of local densities and bipartite entanglement in a quantum gas by a dissipative defect
We study the complex dynamics of a one-dimensional Bose gas subjected to a
dissipative local defect which induces one-body atom losses. In experiments
these atom losses occur, for example, when a focused electron or light beam or
a single trapped ion is brought into contact with a quantum gas. We discuss how
within such setups one can measure or manipulate densities locally and specify
the excitations that are induced by the defect. In certain situations the
defect can be used to generate entanglement in a controlled way despite its
dissipative nature. The careful examination of the interplay between hole
excitations and the collapse of the wave function due to nondetection of loss
is crucial for the understanding of the dynamics we observe.Comment: 4+ pages, 3 figure
Reducing Carbon Emissions from the Tourist Accommodation Sector on Non-Interconnected Islands : A Case Study of a Medium-Sized Hotel in Rhodes, Greece
Acknowledgments: The authors would like to thank Mikhalis Markopoulos and Manolis Markopoulos for their assistance in gathering comprehensive information about the special demands of hotels, the hotelâs energy consumption and energy bills.Peer reviewedPublisher PD
A new crystal modification of diammonium hydrogen phosphate, (NH4)2(HPO4)
The addition of hexaÂfluoridoÂphosphate salts (ammonium, silver, thallium or potassium) is usually used to precipitate complex cations from aqueous solutions. It has long been known that PF6
â is sensitive towards hydrolysis under acidic conditions [Gebala & Jones (1969 â¶). J. Inorg. Nucl. Chem.
31, 771â776; Plakhotnyk et al. (2005 â¶). J. Fluorine Chem.
126, 27â31]. During the course of our investigation into coinage metal complexes of diphosphine ligands, we used ammonium hexaÂfluoridoÂphosphate in order to crystallize [Ag(diphosÂphine)2]PF6 complexes. From these solutions we always obtained needle-like crystals which turned out to be the title compound, 2NH4
+·HPO4
2â. It was received as the hydrolysis product of NH4PF6. The crystals are a new modification of diammonium hydrogen phosphate. In contrast to the previously published polymorph [Khan et al. (1972 â¶). Acta Cryst. B28, 2065â2069], ZâČ of the title compound is 2. In the new modification of the title compound, there are eight molÂecules of (NH4)2(HPO4) in the unit cell. The structure consists of PO3OH and NH4 tetraÂhedra, held together by OâHâŻO and NâHâŻO hydrogen bonds
Tropospheric transport and unresolved convection: numerical experiments with CLaMS 2.0/MESSy
Pure Lagrangian, i.e., trajectory-based transport models, take into account only the resolved advective part of transport. That means neither mixing processes between the air parcels (APs) nor unresolved subgrid-scale advective processes like convection are included. The Chemical Lagrangian Model of the Stratosphere (CLaMS 1.0) extends this approach by including mixing between the Lagrangian APs parameterizing the small-scale isentropic mixing. To improve model representation of the upper troposphere and lower stratosphere (UTLS), this approach was extended by taking into account parameterization of tropospheric mixing and unresolved convection in the recently published CLaMS 2.0 version. All three transport modes, i.e., isentropic and tropospheric mixing and the unresolved convection can be adjusted and optimized within the model. Here, we investigate the sensitivity of the model representation of tracers in the UTLS with respect to these three modes. For this reason, the CLaMS 2.0 version implemented within the Modular Earth Submodel System (MESSy), CLaMS 2.0/MESSy, is applied with meteorology based on the ERA-Interim (EI) and ERA5 (E5) reanalyses with the same horizontal resolution (1.0Ă1.0â) but with 60 and 137 model levels for EI and E5, respectively. Comparisons with in situ observations are used to rate the degree of agreement between different model configurations and observations. Starting from pure advective runs as a reference and in agreement with CLaMS 1.0, we show that among the three processes considered, isentropic mixing dominates transport in the UTLS. Both the observed CO, O3, N2O, and CO2 profiles and COâO3 correlations are clearly better reproduced in the model with isentropic mixing. The second most important transport process considered is convection which is only partially resolved in the vertical velocity fields provided by the analysis. This additional pathway of transport from the planetary boundary layer (PBL) to the main convective outflow dominates the composition of air in the lower stratosphere relative to the contribution of the resolved transport. This transport happens mainly in the tropics and sub-tropics, and significantly rejuvenates the age of air in this region. By taking into account tropospheric mixing, weakest changes in tracer distributions without any clear improvements were found.</p
Tropospheric transport and unresolved convection: numerical experiments with CLaMS 2.0/MESSy
Pure Lagrangian, i.e., trajectory-based transport models, take into account only the resolved advective part of transport. That means neither mixing processes between the air parcels (APs) nor unresolved subgrid-scale advective processes like convection are included. The Chemical Lagrangian Model of the Stratosphere (CLaMS 1.0) extends this approach by including mixing between the Lagrangian APs parameterizing the small-scale isentropic mixing. To improve model representation of the upper troposphere and lower stratosphere (UTLS), this approach was extended by taking into account parameterization of tropospheric mixing and unresolved convection in the recently published CLaMS 2.0 version. All three transport modes, i.e., isentropic and tropospheric mixing and the unresolved convection can be adjusted and optimized within the model. Here, we investigate the sensitivity of the model representation of tracers in the UTLS with respect to these three modes.
For this reason, the CLaMS 2.0 version implemented within the Modular Earth Submodel System (MESSy), CLaMS 2.0/MESSy, is applied with meteorology based on the ERA-Interim (EI) and ERA5 (E5) reanalyses with the same horizontal resolution (1.0Ă1.0) but with 60 and 137 model levels for EI and E5, respectively. Comparisons with in situ observations are used to rate the degree of agreement between different model configurations and observations. Starting from pure advective runs as a reference and in agreement with CLaMS 1.0, we show that among the three processes considered, isentropic mixing dominates transport in the UTLS. Both the observed CO, O, NO, and CO profiles and COâO correlations are clearly better reproduced in the model with isentropic mixing. The second most important transport process considered is convection which is only partially resolved in the vertical velocity fields provided by the analysis. This additional pathway of transport from the planetary boundary layer (PBL) to the main convective outflow dominates the composition of air in the lower stratosphere relative to the contribution of the resolved transport. This transport happens mainly in the tropics and sub-tropics, and significantly rejuvenates the age of air in this region. By taking into account tropospheric mixing, weakest changes in tracer distributions without any clear improvements were found
Light-cone-like spreading of correlations in a quantum many-body system
How fast can correlations spread in a quantum many-body system? Based on the
seminal work by Lieb and Robinson, it has recently been shown that several
interacting many-body systems exhibit an effective light cone that bounds the
propagation speed of correlations. The existence of such a "speed of light" has
profound implications for condensed matter physics and quantum information, but
has never been observed experimentally. Here we report on the time-resolved
detection of propagating correlations in an interacting quantum many-body
system. By quenching a one-dimensional quantum gas in an optical lattice, we
reveal how quasiparticle pairs transport correlations with a finite velocity
across the system, resulting in an effective light cone for the quantum
dynamics. Our results open important perspectives for understanding relaxation
of closed quantum systems far from equilibrium as well as for engineering
efficient quantum channels necessary for fast quantum computations.Comment: 7 pages, 5 figures, 2 table
Stem Cell-Specific Mechanisms Ensure Genomic Fidelity within HSCs and upon Aging of HSCs
SummaryWhether aged hematopoietic stem and progenitor cells (HSPCs) have impaired DNA damage repair is controversial. Using a combination of DNA mutation indicator assays, we observe a 2- to 3-fold increase in the number of DNA mutations in the hematopoietic system upon aging. Young and aged hematopoietic stem cells (HSCs) and hematopoietic progenitor cells (HPCs) do not show an increase in mutation upon irradiation-induced DNA damage repair, and young and aged HSPCs respond very similarly to DNA damage with respect to cell-cycle checkpoint activation and apoptosis. Both young and aged HSPCs show impaired activation of the DNA-damage-induced G1-S checkpoint. Induction of chronic DNA double-strand breaks by zinc-finger nucleases suggests that HSPCs undergo apoptosis rather than faulty repair. These data reveal a protective mechanism in both the young and aged hematopoietic system against accumulation of mutations in response to DNA damage
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