scholarly journals GraviDy: a modular, GPU-based, direct-summation N-body code

2014 ◽  
Vol 10 (S312) ◽  
pp. 252-253
Author(s):  
Cristián Maureira-Fredes ◽  
Pau Amaro-Seoane
Keyword(s):  
Galactic Nuclei ◽  
Complex Problem ◽  
Massive Black Hole ◽  
Single Node ◽  
Initial Release ◽  
Dense Cluster ◽  
Binary Evolution ◽  
The Impact ◽  
Direct Summation

AbstractThe direct-summation of N gravitational forces is a complex problem for which there is no analytical solution. Dense stellar systems such as galactic nuclei and stellar clusters are the loci of different interesting problems. In this work we present a new GPU, direct-summation N-body integrator written from scratch and based on the Hermite scheme. The first release of the code consists of the Hermite integrator for a system of N bodies with softening. We find an acceleration factor of about ≈ 90 of the GPU version in a single node as compared to the Serial-Single-CPU one. We additionally investigate the impact of using softening in the dynamics of a dense cluster. We study how it affects the two body relaxation, as compared with another code, NBODY6, which uses KS regularization, so as to understand the role of softening in the evolution of the system. This initial release is the first step towards more and more realistic scenarios, starting for a proper treatment for binary evolution, close encounters and the role of a massive black hole.

DAMPAK BADAN USAHA MILIK DESA (BUMDES) TERHADAP KESEJAHTERAAN MASYARAKAT DI DESA TUTUR

2021 ◽  
Vol 4 (1) ◽  
pp. 131
Author(s):  
Khumaidi Khumaidi ◽  
Siti Zaynab
Keyword(s):  
Rural Communities ◽  
Rural Economy ◽  
Complex Problem ◽  
Business Development ◽  
Qualitative Approach ◽  
Depth Interview ◽  
New Business ◽  
The Impact ◽  
The Village

Badan Usaha Milik Desa thereafter called BUMDes is an alternative to improve the rural economy. Unfortunately, however, the position of BUMDes had not been governed completely in existing legislation. Another more complex problem is that in choosing an appropriate enterprise for establishing BUMDes. This study aims to describe the impact of BUMDES on the welfare of rural communities. BUMDES is one of the programs to strengthen the role of the region.This research was conducted using a qualitative approach and used in-depth interview and observation techniques. The results of the study have shown that BUMDES has had an impact on the village economy. BUMDES has an impact on community business development in Tutur Village. In addition, BUMDES encourages people to start a new business according to the potential of the community. The impact of other BUMDES is to improve the level of children's education and improve public health

scholarly journals The Effect of Odour Valence and Odour Detection Threshold on the Withholding and Cancellation of Reach-to-Press Responses

2021 ◽  
Author(s):  
Javier Albayay ◽  
Umberto Castiello ◽  
Valentina Parma
Keyword(s):  
Response Inhibition ◽  
Detection Threshold ◽  
Threshold Levels ◽  
Initial Release ◽  
Clean Air ◽  
Main Components ◽  
Task Irrelevant ◽  
The Impact ◽  
Healthy Participants

Abstract Introduction Withholding uninitiated actions and cancelling ongoing ones are two main components of response inhibition, a key element of the executive control. Inhibitory performance is sensitive to emotional contexts elicited by subliminal and supraliminal visual material. However, whether stimuli from other sensory modalities, such as odours, would equally modulate response inhibition remains unclear. Here, we aimed to assess the effect of task-irrelevant odours as a function of their valence and threshold on both action withholding and action cancellation of reach-to-press movements. Method Thirty-two healthy participants performed a Go/No-Go task that included the presentation of pleasant (orange) and unpleasant (trimethyloxazole) odour primes at supra- and sub-threshold levels; clean air was included as a control condition. The reach-to-press responses were composed of an initial release phase and a subsequent reaching phase. Results Only the supra-threshold pleasant (vs. control) odour impaired action withholding. Moreover, the pleasant (vs. control) odour—presented at both sub- and supra-threshold levels—elicited more accurate Go responses, whereas the sub- and supra-threshold pleasant and unpleasant (vs. control) odours triggered faster responses in the release phase. Additionally, only the supra-threshold pleasant (vs. unpleasant) odour impaired action cancellation in the reaching phase. Furthermore, reaching responses were slower following the supra-threshold unpleasant (vs. control) odour. Conclusions Our findings extend the sparse literature on the impact of odour stimuli on goal-directed behaviour, highlighting the role of both odour valence and threshold in the modulation of response inhibition. Implications Determining the mechanisms by which odour stimuli modulate response inhibition lays the foundations for research on odour-triggered disinhibition.

Produção cientifica de enfermagem na perspectiva do controle da infecção hospitalar

2009 ◽  
Vol 3 (4) ◽  
pp. 1065
Author(s):  
Fernanda De Paula Rossini ◽  
Jucelia Alves Silva ◽  
Maria Amélia Belissario Santos ◽  
Denise Andrade
Keyword(s):  
Nosocomial Infection ◽  
Complex Problem ◽  
Scientific Production ◽  
Hospital Infection ◽  
Change Behavior ◽  
Hospital Infection Control ◽  
Number Of Publications ◽  
And Control ◽  
The Impact

Objectives: to analyze the scientific production of nurses on hospital infection, to evaluate the impact of the ordinance MS-196/83 to quantify the production in different decades and list the main measures of prevention and control. Methodology: literature review study was carried out manually from 1980 to 2006, in Brazilian nursing journals of the acquis of the Central Library of the University of São Paulo. Results: 33 publications totaled up nursing on hospital infection, from 2000 to 2006 concentrates the largest number of jobs in this area. Showing participation of 65% of teachers in scientific production. We noticed the high number of publications in order to study law, ethics and CCIH 13 (40%) which emphasize the role of nurses in the context of nosocomial infection and the importance of the role of the Committee for Hospital Infection Control, and the high percentage of studies descriptive / exploratory, seeking to change behavior and control of hospital infection. Conclusion: the fight against hospital infections presents itself today as a complex problem. We recognize that although the theme hospital infection is very common and widely disseminated in the national nursing is still poorly addressed. Descriptors: nosocomial infection; nursing; cientific production.

The role of stellar rotation in Tidal Disruption Events

2018 ◽  
Vol 14 (S342) ◽  
pp. 272-274
Author(s):  
Andrea Sacchi ◽  
Giuseppe Lodato
Keyword(s):  
Black Hole ◽  
Galactic Nuclei ◽  
High Energy ◽  
Stellar Structure ◽  
Rotating Stars ◽  
Stellar Rotation ◽  
Tidal Disruption ◽  
Massive Black Hole ◽  
Smoothed Particle ◽  
The Impact

AbstractTidal Disruption Events (TDEs) are highly variable high energy phenomena originating from Galactic Nuclei (Komossa & Bade 1999). TDEs are thus powerful tools to study quiescent Galactic Nuclei given their extreme brightness (several times super-Eddington) and the possibility of being seen in non-AGN galaxies. A TDE is the violent disruption of a star passing by a Super Massive Black Hole (SMBH); after the disruption, roughly half of the star mass gains enough energy to escape from the Black Hole, while the other half is bound to the Hole, falls back and eventually accretes onto it. Early works, (Rees 1988), pointed out a t−5/3 behaviour for the light curves of this event and since then such a time dependency became the signature of these events. Strong deviations are however introduced when one considers the internal stellar structure or if one considers partial disruptions. One feature that has never been taken into account is the effect of stellar rotation in the resulting fallback rate, which is the aim of the present work. Firstly, we will show analytical estimates of the impact of stellar rotation on the TDE and we will then present a set of Smoothed Particle Hydrodynamic simulations of the tidal disruption of rotating stars, performed in order to test these analytical estimates.

Intergroup Threat and Outgroup Attitudes

2013 ◽  
Vol 44 (5) ◽  
pp. 311-319 ◽  
Author(s):  
Marco Brambilla ◽  
David A. Butz
Keyword(s):  
Gay Men ◽  
Social Group ◽  
Welfare Recipients ◽  
Intergroup Attitudes ◽  
Social Policies ◽  
Intergroup Threat ◽  
Economic Threat ◽  
The Impact ◽  
General Climate

Two studies examined the impact of macrolevel symbolic threat on intergroup attitudes. In Study 1 (N = 71), participants exposed to a macrosymbolic threat (vs. nonsymbolic threat and neutral topic) reported less support toward social policies concerning gay men, an outgroup whose stereotypes implies a threat to values, but not toward welfare recipients, a social group whose stereotypes do not imply a threat to values. Study 2 (N = 78) showed that, whereas macrolevel symbolic threat led to less favorable attitudes toward gay men, macroeconomic threat led to less favorable attitudes toward Asians, an outgroup whose stereotypes imply an economic threat. These findings are discussed in terms of their implications for understanding the role of a general climate of threat in shaping intergroup attitudes.

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