4,880 research outputs found
A Geometric Monte Carlo Algorithm for the Antiferromagnetic Ising model with "Topological" Term at
In this work we study the two and three-dimensional antiferromagnetic Ising
model with an imaginary magnetic field at . In order to
perform numerical simulations of the system we introduce a new geometric
algorithm not affected by the sign problem. Our results for the model are
in agreement with the analytical solutions. We also present new results for the
model which are qualitatively in agreement with mean-field predictions
A New Perspective on Clustered Planarity as a Combinatorial Embedding Problem
The clustered planarity problem (c-planarity) asks whether a hierarchically
clustered graph admits a planar drawing such that the clusters can be nicely
represented by regions. We introduce the cd-tree data structure and give a new
characterization of c-planarity. It leads to efficient algorithms for
c-planarity testing in the following cases. (i) Every cluster and every
co-cluster (complement of a cluster) has at most two connected components. (ii)
Every cluster has at most five outgoing edges.
Moreover, the cd-tree reveals interesting connections between c-planarity and
planarity with constraints on the order of edges around vertices. On one hand,
this gives rise to a bunch of new open problems related to c-planarity, on the
other hand it provides a new perspective on previous results.Comment: 17 pages, 2 figure
Advances on Testing C-Planarity of Embedded Flat Clustered Graphs
We show a polynomial-time algorithm for testing c-planarity of embedded flat
clustered graphs with at most two vertices per cluster on each face.Comment: Accepted at GD '1
Effect of decreasing dietary crude protein on growth performance, feed efficiency and meat quality of finishing Charolais bulls
This study aimed to evaluate the effect of decreasing dietary crude protein (CP) on the performance of finishing Charolais bulls in the Italian rearing system. Animals were fed two diets, differing only in the CP level (low protein (LP), 13.5% CP versus control (CON), 15.0% CP). Dry matter (DM) intake (DMI) and animals\u2019 weights were recorded to obtain average daily gain (ADG) and feed conversion rate (FCR). Feed and fecal samples were collected to evaluate digestibility of diet components. Daily cost of the ration (DRC), feed cost per kg of daily weight gain (CDG) and daily gross margin (DGM) were calculated to analyze the possible benefits of decreasing the protein level. Meat quality analyses were also conducted. Higher DMI (10.6 versus 10 kg/d; p < 0.05) and ADG (1.47 versus 1.36 kg/d; p < 0.05) were observed for CON. No differences in FCR or digestibility were found. Even if the DRC was lower (p < 0.05) for the LP diet (2.26 versus 1.97 \u20ac; CON versus LP), no difference was reported for CDG and DGM. Meat lightness and redness were significantly lower and higher in the LP, respectively. To conclude, the CP requirement in these rearing conditions appeared to be higher than 13.5%
Efficacy on sleep parameters and tolerability of melatonin in individuals with sleep or mental disorders: A systematic review and meta-analysis
âEverything Will Be Fineâ: A Study on the Relationship between Employeesâ Perception of Sustainable HRM Practices and Positive Organizational Behavior during COVID19
Sustainable human resource management practices represent one of the main organizational
strategy to survive and to prosper within the fast-moving current scenario. According to this view,
sustainability is strictly linked to the consideration of the unique and distinctive value that each
human resource means for organizations. The recent COVID19 pandemic is having a serious
impact on organizations and on their employees, it is profoundly changing the working modalities,
mainly introducing smart working practices that were showed to have significant consequences on
workersâ wellbeing. This study aims to investigate employeesâ perception of sustainable HRM in
the frame of the COVID19 emergency, exploring if and to what extent perceptions of involvement
and organizational support together with individual coping strategies associated with organizational
change could influence positive organizational behaviors, namely organizational engagement and
extra-role behavior. The research involved 549 participants who completed a self-report online
questionnaire encompassing psycho-social measures of the abovementioned variables. Results
confirmed the important role played by sustainable HRM practices both for the capitalization of
human resources and of organizational performance in a time of great uncertainty and global crisis.
Implications for theory and HRM practice development were also discussed
Does the end justify the means? The role of organizational communication among workâfromâhome employees during the covidâ19 pandemic
During the first months of 2020, the world, and Italy at an early stage, went through the Covidâ19 emergency that had a great impact on individual and collective health, but also on working processes. The mandatory remote working and the constant use of technology for employees raised different implications related to technostress and psychoâphysical disorders. This study aimed to detect, in such a period of crisis and changes, the role of organizational communication considering the mediating role of both technostress and selfâefficacy, with psychoâphysical disorders as outcome. The research involved 530 workers working from home. A Structural Equations Model was estimated, revealing that organizational communication is positively associated with selfâefficacy and negatively with technostress and psychoâphysical disorders. As mediators, technostress is positively associated with psychoâphysical disorders, whereas selfâefficacy is negatively associated. As regards mediated effects, results showed negative associations between organizational communication and psychoâphysical disorders through both technostress and selfâefficacy. This study highlighted the potential protective role of organizational communication that could buffer the effect of technostress and enhance a personal resource, selfâefficacy, which is functional to the reduction of psychoâphysical disorders. This study contributed to literature underlying the role of communication in the current crisis and consequent reorganization of the working processes
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