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Santiago Giraldo regresaría a una convocatoria de Colombia para Copa Davis, tras estar ausente ante Barbados en enero de este año.

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El tenista colombiano Santiago Giraldo afirmó este jueves que el calor y la humedad propias de Barranquilla favorecerán a su equipo en la serie contra Brasil por la Copa Davis.

Santiago Giraldo afirmó este jueves

Ambos países se enfrentarán el 6 y el 7 de abril próximo en el complejo de raquetas de esta ciudad caribeña, por la segunda ronda del Grupo 1 de la zona americana.

raquetas de esta ciudad caribeña,

" Además del apoyo de la gente y de la localía, las condiciones en Barranquilla son particulares porque hay brisa, calor y humedad, y eso es conveniente para el equipo porque ya hemos jugado en condiciones similares ", dijo Giraldo en una rueda de prensa en la citada ciudad.

es conveniente para el equipo
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El complejo de raquetas es uno de los escenarios construidos para los XXIII Juegos Centroamericanos y del Caribe 2018 que se celebrarán del 19 de julio al 3 de agosto en Barranquilla.

XXIII Juegos Centroamericanos y del Caribe 2018 19 de julio al 3 de agosto en Barranquilla.

Barranquilla, la casa de Colombia para enfrentar a Brasil en @CopaDavis >> https://t.co/j3QiUepYhw pic.twitter.com/H3DGzYD9Hx

Giraldo, que ocupó el puesto 28 del ránking de la ATP en 2014, agregó que el equipo está listo para vencer a Brasil.

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Mathematician and knitter sarah-marie belcastrouses math to inspire her knitting projects

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Step aside, infinity scarves , you aren't infinite at all. The (5,3) torus knot cowl is where it's at.

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was the mathematical fiber arts session . You can view a slide show I put together from the session . During the session, co-organizer sarah-marie belcastro gave a talk about her beautiful knitted torus knots and links. I included a picture of them in the slide show but wanted to share a few more details about them here on the blog.

In mathematics, a knot is basically what it is in the real world. You take a length of string, tie it up somehow, and attach the free ends together so it doesn't have a starting or stopping point. (I wrote about knots in a blog post last year , in case you'd like to explore them more.) A link is any number of knots put together. They might just be stuck next to each other, or they might be entwined in some interesting way.

Torus knots and links, the subject of belcastro's talk, can be made by wrapping a string around a torus, or a donut. You can think of a torus as the shape you get when you sweep a circle around another circle as in the diagram below.

We can think of the red circle and the pink circle, the circles that wrap through the hole or around the hole, respectively, as the two main "directions" on the torus, analogous to latitude and longitude on a sphere.

A torus knot or link is defined by how many times it wraps around the two main directions. A ( p,q ) torus link* wraps p times through the center (along the red circle) and q times around the hole (along the pink circle). If we use a negative number instead a positive one for p or q , the description is the same, but the knot or link spirals around the torus in a different direction. For more illustrations of torus knots, check out the Knot Atlas .

Any two integers p and q can define a torus link. If the numbers don't share a common factor, the link only has one piece, so we call it a knot. If they do share a common factor, the link has more than one piece, like this (4,2) torus link. (The number of pieces is the same as the largest common factor that p and q share.)

Belcastro is both a mathematician and a knitter, and she has become adept at combining the two subjects. She uses mathematics to understand and guide her knitting and knitting to visualize complicated mathematical objects. A few years ago, belcastro started knitting tori using contrasting yarn to illustrate torus knots on them.

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The above tweet fairly accurately captures millennials’ current attitude about climate change. It’s easy to retweet a pithy status in support of saving the earth; it’s harder to actually save the earth.

Collectively , a media platform that launched last week, aims to transform that apathy into earth-altering action by channeling to its cause the feel-good shareability of Upworthy and the financial backing of 29 brand partners .

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, the platform is the result of talks at the World Economic Forum about “how to inspire and accelerate the shift toward a more sustainable way of life.” It’s dedicated to “altering the course of our collective futures” and repairing “the disconnect between our wishes for the future of the planet and the tools we have to get there.”

While today’s media is “obsessed with fear-mongering tactics” that leave people fearful of and ineffectual towards earth’s imminent self-inflicted demise, writes Carr-Harris, “Collectively will break through that negativity and cynicism to help people learn how they can help. Take meaningful action. Choose to make a difference.”

Upworthy’s influence on Collectively’s editorial strategy is evident. Its headlines range from intriguing with a sexual bent (“ The Unexpected Father–Daughter Team Making Condoms People Will Love Having Inside Them ”) and hoo-rah positive (“ These 20-Somethings Beat a Huge Energy Corporation and Took Control of the Power Grid ”) to look-what-you-can-do informative(“ Your Old Phone Could Be the Key to Creating a Better City ”) and culturally relevant clickbait (“ How Science Fiction Is Making Our Society Smarter ”).

Collectively CEO Will Gardner told Mashable via email that the site would be editorially independent of the brands backing it.

“Our brand sponsors have signed up to support an editorially independent site. Our policy is to highlight a range of positive and exciting ideas and solutions to sustainable living challenges, from wherever they come in the world,” Gardner said.

However, Mashable’sJason Abbruzzese wonders if that’s possible , notingthat some of Collectively’s coverage areas (e.g., food) are at odds with some of its sponsors (e.g., McDonald’s and Nestlé). He also speculates that Collectively’s coverage of climate change issues willbe handled with brand-friendly restraint.

“Carr-Harris noted that companies and people need to work together figure out what we can do about climate issues,” writes Abbruzzese, “as long as that means not pointing to the cause of these issues.”

Gawker’s Hamilton Nolan also expressed doubts over the site’s supposed editorial independence, lacing his post with heavy sarcasm:

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Encryption context is a set of key-value pairs that you can pass to AWS KMS when you call the Altuzarra Embellished Printed Top Outlet Store Locations Sale Outlet Locations hWTsl96htS
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, ReEncrypt , GenerateDataKey , and GenerateDataKeyWithoutPlaintext APIs. It is checked for integrity but not stored as part of the ciphertext that is returned. Although the encryption context is not included in the ciphertext, it is cryptographically bound to the ciphertext during encryption and must be passed again when you call the Decrypt (or ReEncrypt ) API. Decryption only succeeds if the encryption context you pass for decryption is exactly the same as the encryption context you passed during encryption. The encryption context is logged by AWS CloudTrail.

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on the AWS Security Blog.

Encryption context can consist of any values that you want. However, because it is not encrypted and because it is logged if CloudTrail logging is turned on, your encryption context should not include sensitive information. We further recommend that your encryption context describe the data being encrypted or decrypted so that you can better understand the CloudTrail log entries produced by AWS KMS. For example, Amazon EBS uses the ID of the encrypted volume as the encryption context for server-side encryption. If you are encrypting a file, you might use part of the file path as encryption context.

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Encryption Context in Grants and Key Policies

In addition to using encryption context to check ciphertext integrity and authenticity, AWS KMS supports authorization by using grants and key policies that incorporate encryption context. Authorization that uses encryption context more tightly controls access to encrypted resources. When you create a grant , for example, you can optionally specify a set of constraints that specify an encryption context that unambiguously identifies the resource to which long-term access is being granted. For example, consider encrypted volumes with Amazon EBS and Amazon EC2: When an EBS volume is attached to an EC2 instance, a grant is created that allows only that instance to decrypt only that volume. This is accomplished by encoding the volume ID as the encryption context in the Constraint that is passed to the CreateGrant API. Without the encryption context in the constraint, the Amazon EC2 instance would obtain access to all volumes encrypted under the customer master key (CMK) rather than a specific volume.

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