Hector Parra

Blood pressure

Mon, 15 Mar 2010 21:36:45 -0700

Blood pressure (BP) is a force exerted by circulating blood on the walls of blood vessels, and is one of the principal vital signs. During each heartbeat, BP varies between a maximum (systolic) and a minimum (diastolic) pressure. The mean BP, due to pumping by the heart and resistance in blood vessels, decreases as thecirculating blood moves away from the heart through arteries. It has its greatest decrease in the small arteries and arterioles, and continues to decrease as the blood moves through the capillaries and back to the heart through veins.^[1] Gravity, valves in veins, and pumping from contraction of skeletal muscles, are some other influences on BP at various places in the body.

The term blood pressure usually refers to the pressure measured at a person’s upper arm. It is measured on the inside of an elbow at the brachial artery, which is the upper arm’s major blood vessel that carries blood away from the heart. A person’s BP is usually expressed in terms of the systolic pressure and diastolic pressure, for example 120/80.

CouchDB: The Definitive Guide

Mon, 15 Mar 2010 02:11:50 -0700

CouchDB: The Definitive Guide

Erlang vs. Scala

Mon, 15 Mar 2010 02:09:18 -0700

Erlang vs. Scala

Pragmatic Programming Techniques: Search Engine Basics

Mon, 15 Mar 2010 02:08:42 -0700

Pragmatic Programming Techniques: Search Engine Basics

HumbleFinance: Dynamic Charts with HTML5, Canvas, and Flotr for Prototype

Sun, 14 Mar 2010 23:55:28 -0700

HumbleFinance: Dynamic Charts with HTML5, Canvas, and Flotr for Prototype:

HumbleFinance is an HTML5 data visualization tool written as a demonstration of interactive graphing in HTML5. It is similar to the Flash tool on http://finance.google.com/. The tool itself is written entirely in JavaScript, using the Prototype and Flotr libraries. It can be used to display any two 2-D data sets of real numerical data which share an axis.

kiwiclx: The Communicators: Martin Cooper (via CSPAN)Origins of...

Sat, 13 Mar 2010 13:50:28 -0800

kiwiclx:

The Communicators: Martin Cooper (via CSPAN)

Origins of cellular telephony, discussion of spectral efficiency, and new technologies.

Is Skype HIPAA-compliant?

Sat, 13 Mar 2010 12:21:58 -0800

Is Skype HIPAA-compliant?

Steve Lawler - Violet (Original Mix)

Fri, 12 Mar 2010 00:25:08 -0800

Steve Lawler - Violet (Original Mix)

Sasha - Who Killed Sparky (Exclusive EmFire Edit)

Fri, 12 Mar 2010 00:13:32 -0800

Sasha - Who Killed Sparky (Exclusive EmFire Edit)

Light for sleep disorder

Thu, 11 Mar 2010 21:39:07 -0800

Light for sleep disorder

The Case Against Vertical Navigation

Thu, 11 Mar 2010 00:46:52 -0800

The Case Against Vertical Navigation:

Louis Lazaris: “Left-hand vertical navigation is an out-of-date method.”

jQuery Quicksand plugin

Thu, 11 Mar 2010 00:38:29 -0800

jQuery Quicksand plugin:

allenluo:

This is awesome o.o

I concur! Quicksand allows you to “Reorder and filter items with a nice shuffling animation.” Inspired by Mac OS X’s CoreAnimation.

Code Bubbles: Rethinking the User Interface Paradigm of...

Wed, 10 Mar 2010 23:41:59 -0800

Code Bubbles: Rethinking the User Interface Paradigm of Integrated Development Environments

Take that, Seasonal Affective Disorder!

Wed, 10 Mar 2010 21:40:00 -0800

Take that, Seasonal Affective Disorder!

Academy Award Winning Movie Trailer

Wed, 10 Mar 2010 00:44:50 -0800

Academy Award Winning Movie Trailer

“Students”: I’ve had a similar dream about a...

Tue, 09 Mar 2010 23:59:35 -0800

“Students”: I’ve had a similar dream about a mysterious math class that I haven’t been to all year. Last time I had it was 6 months ago. The author is right!

Sen. Roy Ashburn: 'I'm gay'

Mon, 08 Mar 2010 16:36:49 -0800

Sen. Roy Ashburn: 'I'm gay':

… and I voted against all gay rights. Sad.

Properly Timed Light, Melatonin Lift Winter Depression by Syncing Rhythms

Mon, 08 Mar 2010 16:17:42 -0800

Properly Timed Light, Melatonin Lift Winter Depression by Syncing Rhythms:

Lewy AJ, Lefler BJ, Emens JS, Bauer VK. The circadian basis of winter depression. Proc Natl Acad Sci U S A. 2006 Apr 28.

Polycom Touch Control: Looks like Apple did their homework for...

Fri, 05 Mar 2010 12:31:00 -0800

Polycom Touch Control: Looks like Apple did their homework for them, and you know they’re getting royalties for the multitouch. It’s still great UI design.

Ping

Thu, 04 Mar 2010 15:56:44 -0800

Ping:

Verifies IP-level connectivity to another TCP/IP computer by sending Internet Control Message Protocol (ICMP) Echo Request messages. The receipt of corresponding Echo Reply messages are displayed, along with round-trip times. Ping is the primary TCP/IP command used to troubleshoot connectivity, reachability, and name resolution.