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Preparations take place before Catalina Margulis presents during an Analytical Corner called “Discovering Solid Legal Foundations for Central Bank Digital Currencies” for the 2021 Spring Meetings at the International Monetary Fund.
IMF Photo/Cory Hancock
25 March 2021
Washington, DC, United States
Photo ref: CH2103251640.arw
Carine Meyimdjui and Diego Gomes present during the Analytical Corner titled “Epidemics, Gender, and Human Capital” for the 2021 Annual Meetings at the International Monetary Fund.
IMF Photo/Cory Hancock
29 September 2021
Washington, DC, United States
Photo ref: CH210929022.arw
Participants attending the Technical Meeting on Particle Analysis of Environmental Samples for Safeguards Purposes held at the Agency headquarters in Vienna, Austria. 10 November 2015.
Photo Credit: Dean Calma / IAEA
Microsoft's answer to Google Analytics.
You can generate a tracking code for a single domain or multiple sub domains.
Confluence 2013 : “Unleash Your Genius” by finding Big Insights from Big Data.
September 17, Princeton, New Jersey.
解析天文学求解恒星距离的思考
周坚/2014年4月28日
解析天文学（Analytic Astronomy），又称为坐标天文学（Coordinate Astronomy），是使用代数方法进行研究的天文学，2008年6月29日发现的周坚定律就是它的理论基础，2009年3月8日创立的解析宇宙学（著作权登记证号是：2009-A-020687）的解析观点促成了它的提出。那么，解析天文学能够为我们带来什么呢？就让我们通过具体的实际应用来回答这个问题吧。
在日常生活中，观测者在观测发光强度恒定并相同的发光物体的时候，发光强度恒定并相同的特征始终不会随着观测距离的不同而改变。比如以不同的距离去观测发光强度为100瓦的恒定发光电灯泡，其发光强度不可能因为观测者观测它的距离不同而不同。
在日常生活中，观测者在观测发光强度恒定并相同的发光物体的时候，这种发光强度恒定并相同的特征不随观测距离的不同而改变的这一线索，在天文观测中是否也是如此呢？比如我们对太阳的观测，太阳恒定的发光特征至始至终都不可能因为观测者以不同的距离去观测它而改变。
在观测太阳过程中，太阳恒定的发光特征至始至终都不可能因为观测者以不同的距离去观测它而改变的这一线索，对恒星距离的求解是一条重要的线索，因为恒星恒定的发光特征至始至终也都是不可能因为观测者以不同的距离去观测它而改变。
在天文观测中，我们发现：
1、恒星在一般情况下的发光强度是恒定的。
2、光谱类型相同的恒星，其它们的发光强度（光度）也相同。
3、依据赫罗图的研究，恒星的光谱类型与恒星的绝对星等存在唯一相关性。
如此一来，由于恒星的视亮度，即视星等是我们能够通过直接观测来精确确定的参数，同时恒星的光谱类型也是我们能够通过直接观测来精确确定的，再通过赫罗图的光谱类型与绝对星等的对应关系，就能够获得恒星的精确绝对亮度，即恒星的绝对星等，因此，最后我们就能够依据距离模数定义式求解出恒星的精确距离，这就是解析天文学求解恒星距离的思考。
反观目前的天文现状，虽然我们观测到恒星的光谱类型完全一致，但由于观测距离难以精确确定，以至于通过距离模数定义式计算所获得它们的绝对亮度五花八门，即它们的绝对星等值竟然不一致。比如光谱类型为A1V型的主序星，依据SIMBAD天文数据库查询，编号为 HD 3、HD 53、HD 235和HD319，这四颗恒星的光谱类型都是A1V型，属于主序星，视星等分别是6.710等、7.410等、8.660等和5.942等，按道理，它们的绝对亮度，即绝对星等应该是一致的，但依据三角视差法进行观测，它们的视差分别是7.220毫角秒、8.840毫角秒、5.350毫角秒和12.760毫角秒，对应的估计距离分别是452光年、369光年、610光年和256光年，依据距离模数定义式计算，它们的绝对星等竟然分别显示为1.003等、2.142等、2.302等和1.471等，绝对星等值完全不一致，最大值与最小值竟然相差1.299等。
哈哈，这种恒星光谱类型所对应的绝对亮度不一致的观测现象就好比：
1、我们以不同的距离去观测我们赖以生存的太阳竟然获得它的绝对亮度是不一致的观测结果，但太阳恒定的发光特征是千真万确的。
2、在日常生活中，我们以不同的距离去观测一个发光强度恒定的发光物体（比如发光强度为100瓦的恒定发光电灯泡），所获得该发光物体的发光强度恒定的特征竟然随观测者对它进行观测的距离不同而不同，但只要同一个发光强度恒定的发光物体的发光条件不变，它的恒定发光特征是不可能因为观测者对它进行观测的距离不同而不同。
目前，在日常生活中的发光强度恒定并相同的特征始终不会因为观测者对它进行观测的距离不同而不同这样简单的道理，在天文观测中或许被天文学家们给忽略了，这幅编号为ZHOU-Jian-2014008的解析天文学求解恒星距离的思考示意图，不知是否能够提醒我们注意这个即简单又明了的天文道理。
Sébastien Leduc and Carolina Osorio-Buitron present during the Analytical Corner titled “Tax Policy for Inclusive Growth Post Pandemic” for the 2021 Annual Meetings at the International Monetary Fund.
IMF Photo/Cory Hancock
28 September 2021
Washington, DC, United States
Photo ref: CH210928028.arw
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Much as I'd love to do the life drawing course that's being offered by LoveLifeDrawing as a follow-up to Figuary, the course fee is slightly outside my range. Still, I decided to make use of the free sample lesson video they were offering.
This was a guided drawing session spending most of 30 minutes working on a relatively analytical drawing from a single photo. I think my actual drawing time was about 20 minutes (or perhaps a bit less).
The model, Artistic Physique, is one I recognise from the Croquis Café videos, and I suspect this photo may be from their reference library.
Research Thing - Remote Research
Blog post: makaylalewis.co.uk/2015/07/20/sketchnotes-the-research-th...
#TodaysDoodle (No. 269)
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Matthew O'Connor and I brainstormed some visualizations for different Wiki behaviors, with big assists from Shawn Devlin and Matt Liggett.
Panel:
Jonas Damgaard Nielsen, Omniture
Dennis Mortensen, IndexTools
Steve Jackson, Satama
Ian Tickle, WebTrends
Eric T. Peterson, Web Analytics Demystified
Read more about our Google Analytics segmentation and custom reporting on our blog: www.swellpath.com/2008/11/segmentation-and-custom-reporti...
Myrto Oikonomou and Ippei Shibata present on Plentiful Jobs, Scarce Workers? Labor Market Tightness during COVID Times during an Analytical Corner recording at the International Monetary Fund.
IMF Photo/Cory Hancock
6 April 2022
Washington, DC, United States
Photo ref: CH220406028.arw
Our curriculum provides the skills necessary to work in the field of information technology, computer security, networking, data analytics, healthcare informatics, project management, or computer forensics. Our instructors have professional experience and understand the needs of industry and working adults. The instruction is a combination of interactive lecture, hands-on experience, real world case studies, group work, and research.
Microsoft's answer to Google Analytics.
What's interesting is the "Automatically insert tracking script" feature, which requires you to reveal your login/pass of your server.
A member of the AV team moves the monitor displaying Ervin Prifti before recording an Analytical Corner called “Food (in)security: Collateral Damage of the Pandemic” for the 2021 Spring Meetings at the International Monetary Fund.
IMF Photo/Cory Hancock
26 March 2021
Washington, DC, United States
Photo ref: CH210326026.arw
Representatives from IBM visited Wake Forest to talk about technology, the Internet of Things, Blockchain, Watson, and more.
The site overlay tool lets you see your home page with a whole bunch of percentages on all your click'able areas showing you where you get the most hits.. its damn handy!
Participants attending the Technical Meeting on Particle Analysis of Environmental Samples for Safeguards Purposes at the Agency headquarters in Vienna, Austria. 10 November 2015.
Photo Credit: Dean Calma / IAEA