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Nature article!
Source:  Universe@Home
mardi 12 juillet 2016 10:42

Results from the Universe@Home project were published in the most prominent
scientific journal, Nature! The article depicts a stellar evolutionary scenario
that leads to the formation of double black holes, which are probable
sources of gravitational waves similar to those observed recently.

It is a sequel to the article from year 2010, which predicted that the first
detection of gravitational waves will rather origin from a double black hole
merger than from a
double neutron star merger. The latter had been favoured by the majority of
scientists until recent discoveries.

The links to the article are provided below. Please notice especially the
acknowledgements in the Nature publication.

Nature article:
http://arxiv.org/pdf/1602.04531v2 (this article is identical to the Nature
publication, which does not have a free access:
http://www.nature.com/nature/journal/v534/n7608/full/nature18322.html)

The 2010 paper:
http://arxiv.org/pdf/1004.0386v2

---------------

Wyniki otrzymane w ramach projektu Universe@Home zostały opublikowane w
najbardziej prestiżowym czasopiśmie naukowym Nature! Artykuł opisuje evolucję
gwiazdową, która prowadzi do formowania się podwójnych czarnych dziur. Są one
potencjalnymi źródłami fal grawitacyjnych, takich jakie te, które zaobserwowano
niedawno.

Jest to uaktualniona wersja artykułu z 2010 roku, w którym przewidziano, że
pierwsza detekcja fal grawitacyjny będzie pochodziła z koalescencji czarnych
dziur, a nie dwóch gwiazd neutronowych. Ta druga opcja była przewidywana przez
większość naukowców, co zmieniły dopiero niedawne odkrycia.

Poniżej znajdziecie namiary na oba artykuły. Zwróccie szczególnie uwagę na
podziękowania w Nature.

Nature article:
http://arxiv.org/pdf/1602.04531v2 (tan artykuł jest identyczny z tym w Nature,
który nie jest niestety dostępny za darmo:
http://www.nature.com/nature/journal/v534/n7608/full/nature18322.html)

The 2010 paper:
http://arxiv.org/pdf/1004.0386v2


No More Work From Modfit Project
Source:  Milkyway@home
lundi 11 juillet 2016 20:50

Hello Crunchers,

We will no longer be sending work units out through the Modfit project. You will still receive work units tagged as Modfit, but they will not be coming from the official MilkyWay@home application.

Thank you for your patience during the transition.

Jake


ATLAS@home releases a beta application for the multi core jobs
Source:  ATLAS@Home
lundi 11 juillet 2016 17:51

We have released a beta application named "ATLAS_MCORE" for the ATLAS multi-core jobs.

If you are interested in testing it on your machine, you need to allow test task in your project preference to receive jobs from this new application.

This can be enabled by login to your account on the atlasathome webpage, then click on "Your account", then click on "ATLAS@Home preferences", then check the box next to "Run test applications".

The multi-core version will check the BOINC client for both the available CPU cores(the number of CPU cores the client is configured to give to BOINC to use) and available memory size(the number of memory size the client is configured to give to BOINC to use) to decide how many cores will be allocated to one virtual machine which runs the ATLAS job.


For the ATLAS multi-core job, the relation between memory size and number of CPU cores is defined in this formula:

Total_Memory=1300MB+1000MB*Number_of_CPU_Cores

For example, a 1 core job requires 2300 MB memory, and a 2 core job requires 3300 MB memory.

The number of CPU cores which will be allocated to the virtual machine is also calculated according to this formula.
Number_of_CPU_cores=(Total_Memory-1300MB)/1000MB
The minimum number between Number_of_CPU_cores and the available CPU cores from the client is used to allocate to the virtual machine.


Currently, this test app can utilize from 2 to 8 cores of the client depending on the available CPU cores and memory size from the client.

By using multi-core jobs, we expect the runtime of jobs is close to runtime_of_single_core_job/number_of_cores, and it can significantly saves the usage of memory for clients which offers multi-cores to BOINC.
____________


Vice Magazine article about Arecibo Closure
Source:  SETI@Home
dimanche 10 juillet 2016 19:14

Vice Magazine has posted an article about the potential closure of the Arecibo observatory.


Summer Plans for Outsmart Ebola Together
Source:  World Community Grid News and Updates
samedi 9 juillet 2016 15:11

In this brief update, Dr. Erica Saphire talks about the continuing need for research on the Ebola virus, and the search for funding to help analyze the data generated so far by World Community Grid volunteers.


100s of deaths in two cities in 2003 heatwave due to man-made climate change
Source:  Climateprediction.net
vendredi 8 juillet 2016 17:23

CPDN scientists and their colleagues have specified how many deaths can be attributed to man-made climate change during an extreme heatwave in two European cities in 2003. They calculate that in Paris, the hottest city in Europe during the heatwave in summer 2003, 506 out of 735 summer deaths recorded in the French capital were due to a heatwave made worse by man-made climate change. The impact of climate change was less severe in London, with an additional 64 deaths out of a total of 315 heat-related deaths, says the paper ‘Attributing human mortality during extreme heatwaves to anthropogenic climate change, published in the scientific journal Environmental Research Letters. The study, led by ECI scientists, suggests that such research gives policymakers better information about the damaging effects of heatwaves to help them respond to the future challenges of climate change.

The findings were generated by putting the results of climate model simulations of the 2003 heatwave into a health impact assessment of death rates. Using computer time donated by thousands of volunteers from the weather@home project, the researchers ran many thousands of high-resolution regional climate model simulations. They found that human-induced climate change increased the risk of heat-related deaths in central Paris by around 70% and by 20% in London. 

The paper says the mortality rate attributed to man-made climate change in both these cities is notably high, but they are just two of a large number of cities that were affected by the heatwave that year. It suggests that the resulting total number of deaths across Europe due to climate change is likely to be substantially higher.

The paper looks at the three months June to August. It warns that no heatwave on record has ever had such a widespread effect on human health, as experienced during those months of 2003. Previous studies have attributed changes in heatwave frequency and severity to human-caused climate change, or demonstrated the effect of extreme heat on human mortality. This paper is the first to attribute the number of premature deaths to climate change during extreme heat waves.

Lead author Dr Daniel Mitchell, from the Environmental Change Institute, comments: ‘It is often difficult to understand the implications of a planet that is one degree warmer than preindustrial levels in the global average, but we are now at the stage where we can identify the cost to our health of man-made global warming. This research reveals that in two cities alone hundreds of deaths can be attributed to much higher temperatures resulting from human-induced climate change.’

Co-author Dr Chris Huntingford, of the Centre for Ecology and Hydrology, says: ‘Traditionally, climate research has linked increasing levels of greenhouses gases simply to trends in weather, such as generally higher day-to-day temperatures. However, linking the impact of burning of fossil fuels right through to health implications enables much better planning to prepare for any further climatic changes.’

‘By starkly showing we can measure the toll in human lives that climate change is already taking through worsening extreme heat, this study shines a spotlight on our responsibilities as a society for limiting further damage,’ adds co-author Dr Peter Frumhoff of the Union of Concerned Scientists, Cambridge, USA.

The paper concludes that with climate change projected to increase the frequency and severity of future heatwaves, these results highlight an emerging trend. It suggests that further research should focus on possible changes in future death rates, taking into account population and demographic changes.

Media coverage so far:



Simulations are back!
Source:  DENIS@Home
vendredi 8 juillet 2016 12:43

Dear all,
We are putting new simulations in DENIS (in the CRLP2011 app). These first simulations will be in small groups and little by little the groups will increase in size.

Thank you for your patient!

Best regards,
Jesús.
Source: DENIS News
Link: Simulations are back!




Computation errors
Source:  vLHCathome
vendredi 8 juillet 2016 11:28

Since we added the 64bit theory application, a number of tasks are failing with Computation Error. This is due to three reasons.

  • The need for Hardware-assisted virtualization for 64bit
  • Additional checks for issues that were not previously detected e.g. idling VMs.
  • A technology change that still requires some hardening for all the issues that we experience when running on random machines around the world.

In the past 24 hours 71.79% of hosts returned a successful task using v2619.31 but 35.38% failed tasks with 7.18% returning both successful and unsuccessful tasks. This suggests that things are working but we still have some improvements to make.

To help the situation, please could everyone periodically (no more than once per day) visit your account page and click on the Task View link in the Computing and credit section to view the results of your tasks. If you do see a computation error, click on the task to see the exit status code and the logging output.

The breakdown of failures by exit code is as follows.


  • 35.14% -1073740791
  • 27.17% 206
  • 18.84% 194
  • 6.16% 207
  • 4.35% 255
  • 3.26% -2135228415
  • 2.54% 1
  • 2.17% 203
  • 2.17% 5
  • 1.45% -186
  • 0.72% 197
  • 0.36% -2147467259
  • 0.36% -185

We will address each one of these in subsequent posts and once we have arrived at a final solution, the issue will either be fixed to stop it occurring or an entry will be added to the FAQ to explain what is going on.




Breakthrough Listen: Expanding the Search for Life Beyond Earth
Source:  SETI@Home
jeudi 7 juillet 2016 21:07

BSRC's Dr. Steve Croft recently gave a one-hour public talk about how we find planets around other stars, the search for life beyond Earth, and the new Breakthrough Listen project. Watch the video at https://youtu.be/LJaQi8XYzRU

Follow Berkeley SETI on Facebook: http://www.facebook.com/BerkeleySETI
and on Twitter: https://twitter.com/setiathome


Network Updates: Saturday, July 16, 2016 at 1:00am UTC [ Completed ]
Source:  World Community Grid News and Updates
jeudi 7 juillet 2016 20:55

Network updates will be performed Saturday, July 16th. The World Community Grid website and BOINC servers may be affected during this update. [Completed@03:02]