👀 بررسی تاثیرات سفر فضایی بر سلامت چشم فضانوردان 👀

لینک گزارش
@PDATLAB

Wednesday Weekly Seminar / Virtual format

Date:
Wednesday, Jun 26, 2024 / چهارشنبه، 6 تیر 1403

Time:
11:00 AM - 12:00 PM (Tehran time)

Speaker:
Dr. Sasan Ahmadian

Affiliation:
School of Particles and Accelerators, IPM

Title:
Towards a Greener Future: Sustainability in Particle Accelerator Design and operation

Title in Persian:

به سوی آینده ای سبز تر: پایداری در طراحی و عملکرد شتابدهنده های ذرات

Abstract:

Sustainability in particle accelerator facilities is essential for advancing scientific research while minimizing environmental impact. This involves implementing energy-efficient technologies, optimizing resource use, and adopting sustainable practices in facility operations. By reducing energy consumption, utilizing renewable energy sources, and managing waste effectively, particle accelerators can significantly lower their carbon footprint. Furthermore, integrating sustainable design principles in the construction and maintenance of these facilities ensures long-term environmental stewardship. This presentation explores various strategies and innovations that enhance the sustainability of particle accelerator facilities, highlighting their role in promoting eco-friendly scientific advancement.

Indico Link: https://indico.hep.ipm.ir/e/s.ahmadian

Link to Join Virtually: https://meet.google.com/bda-vsem-tuv

Journal Club: Experiments & Phenomenology / Hybrid format

Date:
Monday, Jun 24, 2024 /دوشنبه، 4 تیر 1403

Time:
11:00 AM - 12:00 PM (Tehran time)

Speaker:
Dr. Hossein Karimi

Affiliation:
Iranian Light Source Facility & School of Particles and Accelerators, IPM

Title:
The Pressure Profile Simulations and Heat-Load Study in the Vacuum System Design for Iranian Light Source Facility (ILSF)

Title in Persian:
شبیه سازی پروفایل فشار و بررسی بار حرارتی در طراحی سیستم خلاء چشمه نور ایران

Abstract:

In the process of designing the vacuum system for a synchrotron light source, it is essential to accurately estimate the pressure profile in the vacuum chambers. This is where simulation software plays a critical role. Among the various options available, Molflow and Synrad are standout programs widely used for this purpose. These software have also been used in the vacuum system design of ILSF, and will be showcased in detail in this presentation.

Another crucial consideration in designing the vacuum system is to handle the radiated power generated in dipole magnets and Insertion Devices (IDs). In this case, the photon absorbers are used to protect the vacuum equipment from the radiated power. As this photon absorber receives a high amount of power, several optimizations must be performed in their design to reduce the thermal stress and increase their operation lifetime. These optimizations will be achieved through finite element analysis, a topic that will be thoroughly discussed in this lecture.

Meeting Place: Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually: https://meet.google.com/bda-vsem-tuv

❇️ سیاهچاله های باستانی "هیولا" کشف شدند: ستاره شناسان MIT نور ستاره های گریزان از اختروش های اولیه را ضبط کردند ❇️

لینک گزارش
@PDATLAB

🟦 آیا سیاهچاله ها می‌توانند تنها توسط نور ساخته شوند؟ 🟦

لینک گزارش

@PDATLAB

💫 آزمایشگاه PDAT دو موقعیت خالی با موضوع تحقیقاتی آنالیز داده های کسر هیدروژن خنثی در دوره بازیونش کیهانی دارد 💫

✨ متقاضیان می‌توانند جهت ارسال درخواست خود برای ورود به این حوزه، رزومه خود را برای اکانت تلگرامی زیر ارسال بفرمایند ✨
@pdatlaboratory

💥 مهلت ارسال درخواست ها: ۱۳ ام تیر ماه 💥

دانشکده فیزیک

سمینار کیهان‌شناسی و اخترفیزیک

امواج گرانشی حاصل از تورم غیر جاذب و داده های نانوگرو (بخش دوم)

Induced gravitational waves from non-attractor inflation and NANOGrav data

دکتر امین نصیری

دانشکده فیزیک، دانشگاه صنعتی خواجه نصیر

چکیده: در این سخنرانی در مورد امواج گرانشی حاصل از تورم غیر جاذب صحبت خواهم کرد. به این منظور ابتدا مرور مختصری بر تورم و تورم غیر جاذب خواهم داشت. در ادامه در مورد آرایه زمان سنجی تپ اخترها به عنوان آشکارسازی برای امواج گرانشی صحبت خواهم کرد. در پایان در مورد پیش بینی تورم غیر جاذب در مورد امواج گرانشی صحبت کرده و نتایج را با داده های نانوگرو مقایسه خواهم کرد.

Abstract: In this talk I will talk about the induced gravitational waves from non-attractor inflation. To this end firstly, I will give a brief review about inflation and the non- attractor inflation. Then I will talk about the pulsar timing arrays as a detector of gravitational waves. Finally I will proceed with prediction of non-attractor inflation for the induced gravitational waves and compare the results with the data of NANOGrav.

زمان: ۴ تیر ۱۴۰۳ – ساعت ۱۶ الی ۱۷

مکان: سالن اجتماعات دکتر ابوالحسنی

حضور مجازی: meet.google.com/phx-pdzw-cwg

👑 لیست ۱۰ کورس آنلاین رایگان با مدرک مورد تایید دانشگاهی 👑

لینک گزارش

@PDATLAB

🛟 بهینه سازی یادگیری ماشین با Optuna 🛟

لینک گزارش

@PDATLAB

علاقه‌مندید کدام محتویات زیر را بیشتر در کانال ببینید؟
anonymous poll

موقعیت‌های دکترا و پسادکترا در کشورهای مختلف – 17
👍👍👍👍👍👍👍 40%

اطلاع رسانی سمینارها و وبینارهای علمی – 10
👍👍👍👍 24%

اخبار دنیای اخترفیزیک و کیهان‌شناسی – 8
👍👍👍 19%

آخرین مقالات آرکایوی منتشر شده در حوزه اخترفیزیک و کیهان‌شناسی – 5
👍👍 12%

اخبار دنیای علم به صورت کلی – 2
👍 5%

👥 42 people voted so far.

😍 ۱۰ تا از آخرین تصاویر جذاب تلسکوپ هابل 😍

لینک گزارش
@PDATLAB

🇨🇭 بورسیه فنی CERN سوئیس در حوزه های فناوری اطلاعات، ریاضیات و رباتیک 🇨🇭

لینک گزارش
@PDATLAB

🇦🇺PhD Scholarships in Astrophysics🇦🇺

Institution
University of Melbourne
Department
School of Physics
Number of Positions Available
10
Work Arrangement
In-Person
In-Person Location(s)
Parkville VIC
Australia

Job Denoscription

We invite applications from exceptionally talented students planning a PhD in astrophysics or cosmology for PhD scholarships at the University of Melbourne.

The University of Melbourne is engaged in cutting edge research in observational and theoretical astrophysics, cultural and Indigenous astronomy, high energy astrophysics and transients, state of the art simulations of the early Universe, LIGO gravitational wave analysis, high-redshift galaxies, the cosmic microwave background, and 21 cm observations. The group leads SpIRIT - the first mission of the Australian Space Agency which launched in 2023 and will detect and study high energy transients and gravitational wave counterparts. The group also hosts nodes of two research centres, OzGRAV and ASTRO-3D.

The scholarships come with a tax-free stipend of AUD$37,000/yr (in 2024) for 3.5 years.

Applicants should submit an Expression of Interest through the link, including a statement of research interests, CV, trannoscripts if possible, and two reference letters by July 26 (this deadline is for international students). Successful candidates will be supported through the formal U. Melbourne application process.

Established in 1853, the University of Melbourne helps graduates become well-rounded, thoughtful and skilled professionals who make a positive impact across the globe. It's consistently ranked among the leading universities in the world, with international rankings placing it as #1 in Australia and #31 in the world (THE World Rankings 2021). Our research helps solve challenges the world is facing today and into the future. We're tightly connected with our communities, at home and around the globe; a connection that enriches our learning, teaching and research. The University of Melbourne offers an unsurpassed learning experience on an urban campus located on the edge of downtown Melbourne. Melbourne, a bustling metropolis of around 5 million people, frequently stars on lists of the most liveable cities in the world.

Compensation and Benefits
Compensation Type
Salary
Currency
323
Stipend
$37,000.00AUD
Application Details
Link to Online Application
https://forms.gle/NDsySwincyCJQyjj7
Publication Start Date
2024 Jun 27
Application Deadline
2024 Jul 26
Inquiries
Name
Astrophysics Selection Panel
Email
astrophysics@lists.unimelb.edu.au

🇦🇹 PhD and Postdoc Positions in Lorentzian Geometry/General Relativity/Metric Geometry, Vienna, Austria 🇦🇹

Contact:  ef-applications.mathematics[AT]univie.ac.at
Location:  Vienna, Austria

We are seeking to fill up to five PhD and four Postdoc positions within the research project

A new Geometry for Einstein’s Theory of Relativity and beyond

The project is situated at the intersection of Lorentzian Geometry, General Relativity, Metric Geometry and Optimal Transport, and has received major funding by the Austrian Science Fund (FWF) in the framework of its “Emerging Fields” program.

We are looking for exceptional candidates with a strong background in at least one, preferably several, of the following fields: Riemannian/Lorentzian geometry, functional analysis and measure theory, optimal transport, metric geometry, calculus of variations, geometric analysis, mathematical General Relativity.

https://ef-geometry.univie.ac.at/call-for-praedoc-and-postdoc-positions/

✳️ ستاره شناسان شاهد بیدار شدن یک سیاهچاله عظیم هستند!!! ✳️

لینک گزارش
@PDATLAB

🛠 راهنمای مبتدیان برای تمیز کردن داده ها با Pyjanitor 🛠

لینک گزارش
@PDATLAB

🔭 کدام تلسکوپ برای مبتدیان بهتر است؟ 🔭

لینک گزارش
@PDATLAB

Journal Club: Experiments & Phenomenology / Hybrid format

Date:

Monday, Jul 1, 2024 / دوشنبه، 11 تیر 1403

Time:

11:00 AM - 12:00 PM (Tehran time)

Speaker:

Dr. Saeedeh Afhami



Affiliation:

Iranian Light Source Facility & School of Particles and Accelerators, IPM

Title:

Non-Evapourable Getters Coating, a novel route to achieve ultra high vacuum



Title in Persian:

لایه نشانی جاذب های غیر تبخیری، مسیری جدید برای دستیابی به خلاء بسیار بالا



Abstract:

The search for an effective solution to the problem of pumping conductance-limited vacuum systems, as those for particle accelerators, lead, at the end of 1995, to the start of the development of Non-Evaporable Getters (NEG) thin film coatings at CERN. Coating the whole inner surface of a vacuum chamber, after dissolving the NEG oxide layer by heating (activation), transforms it from a source of
gas into a pump providing very high pumping speed per unit length. In this talk, we will present the NEG physics and also describe how discharge voltage, magnetic field strength, and pressure effect on the deposition rate.



Based on: https://arxiv.org/pdf/2006.01537

Meeting Place: Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually: https://meet.google.com/bda-vsem-tuv

Seminar / Virtual format
Date:
Wednesday, Jul 3, 2024 / چهارشنبه، 13 تیر 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Mr. Mohammad Aghaie
 
Affiliation:
University of Pisa and INFN sezione di Pisa
Title:
Minimal Dark Matter and its Indirect Detection
 
Title in Persian:
مدل ماده تاریک مینیمال و شناسایی غیرمستقیم آن
 
Abstract:
In this study, we investigate the sensitivity of the Cherenkov Telescope Array (CTA) and Fermi Large Area Telescope (Fermi-LAT) to dark matter (DM) annihilation in γ-ray lines. We focus on observations of the Galactic Center (GC), dwarf Spheroidal galaxies (dSphs), and galaxy clusters (GCls). Specifically, we compare the reach of the GC with that of dSphs, considering the poorly known putative core radius of the DM distribution. Surprisingly, we find that the currently best dSph candidates present a more promising target than the GC, especially for core radii ranging from one to a few kiloparsecs.
In addition to CTA prospects, we extend our analysis to incorporate Fermi-LAT data. Recent advancements in computations have highlighted the impact of Sommerfeld enhancement and bound-state formation on the annihilation cross section of Minimal Dark Matter (MDM) multiplets. Exploring this new paradigm, we examine Fermi-LAT data to assess its capability to detect or rule out a potential line arising from bound-state formation processes. Our findings reveal that the Fermi-LAT data effectively rules out the MDM 5plet at a significance level of 2σ, demonstrating the importance of considering enhanced cross sections and new annihilation signatures in the quest to unravel the mysteries of dark matter.
Indico Link: https://indico.hep.ipm.ir/e/m.aghaie
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv