Published on Jun 23, 2014
Category
Education
License
Standard YouTube License
- Author:
- youtube
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Published on Jun 23, 2014
Category
Education
License
Standard YouTube License
- Author:
- youtube
AES is a ‘symmetric block cipher’ for encrypting texts which can be decrypted with the original encryption key.
For many purposes, a simpler encryption algorithm such as TEA is perfectly adequate – but if you suspect the world’s best cryptographic minds, and a few million dollars of computing resource, might be attempting to crack your security, then AES, based on the Rijndael algorithm, is the tightest security currently available (approved by the US government for classified information up to ‘Secret’ – and in in 192 or 256 key lengths, up to ‘Top Secret’). AES was adopted by NIST in 2001 as FIPS-197, and is the replacement for DES which was withdrawn in 2005.
I developed this JavaScript implementation to to illustrate the original AES standard (NIST FIPS-197) as closely as possible. It is intended as an introduction for people seeking to learn something about implementing encryption, not an authoritative implementation – cryptography experts will already know more than I present here. The emphasis is on transparency and fidelity to the standard rather than efficiency.
This script also includes a wrapper function which implements AES in the ‘Counter’ mode of operation (specified in NIST SP 800-38A) to encrypt arbitrary texts – many descriptions of AES limit themselves to the Cipher routine itself, and don’t consider how it can be used to encrypt texts.
This is principally a learning exercise, and I am not a cryptographic expert. I can provide no warranty or guarantees if you choose to use this code in production environments.
As the carbon dioxide concentration of our atmosphere increases and our climate warms, the hay fever season seems to be getting longer and more severe. In this case study, students assume the a role of a public relations specialist contracted to communicate the link between climate change and pollen allergies. The activity focuses on the importance of scientific skills to careers outside science, and is most suitable for a lower-level introductory biology, human health, or environmental science course.
- Author:
- Luke Sandro
- Richard E. Lee, Jr.
- Juanita Constible
فيديو يوضح كيفية تمثيل المعرفة بواسطة الذماء الاصطناعي
- Author:
- Adel Sabour
Student groups create working radios by soldering circuit components supplied from AM radio kits. By carrying out this activity in conjunction with its associated lesson concerning circuits and how AM radios work, students are able to identify each circuit component they are soldering, as well as how their placement causes the radio to work. Besides reinforcing lesson concepts, students also learn how to solder, which is an activity that many engineers perform regularly giving students a chance to be able to engage in a real-life engineering activity.
- Author:
- Techtronics Program,
- Emily Spataro, Lisa Burton, Lara Oliver, Brandon Jones
Aseptic processing is the main technical operation in Pharmaceutical and Biopharmaceutical Production. The presentation teaches all the educational details for students and young executives
- Author:
- Biobridge Healthcare
For students interested in studying biomechanical engineering, especially in the field of surgery, this lesson serves as an anatomy and physiology primer of the abdominopelvic cavity. Students are introduced to the abdominopelvic cavity—a region of the body that is the focus of laparoscopic surgery—as well as the benefits and drawbacks of laparoscopic surgery. Understanding the abdominopelvic environment and laparoscopic surgery is critical for biomechanical engineers who design laparoscopic surgical tools.
- Author:
- TeachEngineering.org
- Integrated Teaching and Learning Program,
- Benjamin S. Terry, Brandi N. Briggs, Stephanie Rivale, Denise W. Carlson
Published on Feb 19, 2015
See the written guide alongside the video on our website http://geekymedics.com/2010/09/30/abd...
This video aims to give you an idea of what's required in the Abdominal Examination OSCE.
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Always adhere to your medical schools / local hospital trusts guidelines when performing examinations or clinical procedures. Do NOT perform any examination or procedure on patients based purely upon the content of these videos. Geeky Medics accepts no liability for loss of any kind incurred as a result of reliance upon information provided in this video.
REFERENCES
Finger clubbing image - "ClubbingCF" by Jerry Nick, M.D. - http://knol.google.com/k/jerry-nick-m....
Acanthosis Nigricans image - „Fibrome“ von Klaus D. Peter, Gummersbach, Germany - Eigenes Werk (own photograph).
Spider naevi image - By Herbert L. Fred, MD and Hendrik A. van Dijk (http://cnx.org/content/m14900/latest/) Follow us on Instagram at http://www.instagram.com/geekymedics
Category
Education
License
Standard YouTube License
- Author:
- Geeky Medics
Students learn about the concepts of accuracy and approximation as they pertain to robotics, gain insight into experimental accuracy, and learn how and when to estimate values that they measure. Students also explore sources of error stemming from the robot setup and rounding numbers.
- Author:
- AMPS GK-12 Program,
- TeachEngineering.org
- Ronald Poveda
At this point in the unit, students have learned about Pascal's law, Archimedes' principle, Bernoulli's principle, and why above-ground storage tanks are of major concern in the Houston Ship Channel and other coastal areas. In this culminating activity, student groups act as engineering design teams to derive equations to determine the stability of specific above-ground storage tank scenarios with given tank specifications and liquid contents. With their floatation analyses completed and the stability determined, students analyze the tank stability in specific storm conditions. Then, teams are challenged to come up with improved storage tank designs to make them less vulnerable to uplift, displacement and buckling in storm conditions. Teams present their analyses and design ideas in short class presentations.
- Author:
- Emily Sappington, Mila Taylor
- National Science Foundation GK-12 and Research Experience for Teachers (RET) Programs,
Students are provided with an introduction to above-ground storage tanks, specifically how and why they are used in the Houston Ship Channel. The introduction includes many photographic examples of petrochemical tank failures during major storms and describes the consequences in environmental pollution and costs to disrupted businesses and lives, as well as the lack of safety codes and provisions to better secure the tanks in coastal regions regularly visited by hurricanes. Students learn how the concepts of Archimedes' principle and Pascal's law act out in the form of the uplifting and buckling seen in the damaged and destroyed tanks, which sets the stage for the real-world engineering challenge presented in the associated activity to design new and/or improved storage tanks that can survive storm conditions.
- Author:
- Emily Sappington, Mila Taylor
- National Science Foundation GK-12 and Research Experience for Teachers (RET) Programs,
هذا الملف مفيد جدا للباحثين وطلاب الدراسات العليا للكتابه العلمية الجيدة
Students work as physicists to understand centripetal acceleration concepts. They also learn about a good robot design and the accelerometer sensor. They also learn about the relationship between centripetal acceleration and centripetal force governed by the radius between the motor and accelerometer and the amount of mass at the end of the robot's arm. Students graph and analyze data collected from an accelerometer, and learn to design robots with proper weight distribution across the robot for their robotic arms. Upon using a data logging program, they view their own data collected during the activity. By activity end , students understand how a change in radius or mass can affect the data obtained from the accelerometer through the plots generated from the data logging program. More specifically, students learn about the accuracy and precision of the accelerometer measurements from numerous trials.
- Author:
- AMPS GK-12 Program,
- Carlo Yuvienco
- Jennifer S. Haghpanah
An overview of the different measurement systems
- Author:
- University of South Carolina (University of South Carolina)
In this activity, students explore the effect of chemical erosion on statues and monuments. They use chalk to see what happens when limestone is placed in liquids with different pH values. They also learn several things that engineers are doing to reduce the effects of acid rain.
- Author:
- Janet Yowell
- Malinda Schaefer Zarske
- Integrated Teaching and Learning Program,
- Melissa Straten
- Jessica Todd
Students conduct a simple experiment to model and explore the harmful effects of acid rain (vinegar) on living (green leaf and eggshell) and non-living (paper clip) objects.
- Author:
- Janet Yowell
- Malinda Schaefer Zarske
- Natalie Mach
- Integrated Teaching and Learning Program,
- Amy Kolenbrander
- Denise Carlson
Students are introduced to the differences between acids and bases and how to use indicators, such as pH paper and red cabbage juice, to distinguish between them.
- Author:
- Janet Yowell
- Malinda Schaefer Zarske
- Natalie Mach
- Amy Kolenbrander
- Sharon Perez
- Denise Carlson
- Gwendolyn Frank
Students construct rockets from balloons propelled along a guide string. They use this model to learn about Newton's three laws of motion, examining the effect of different forces on the motion of the rocket.
- Author:
- Ben Heavner
- Malinda Schaefer Zarske
- Integrated Teaching and Learning Program,
- Denise W. Carlson
- Sabre Duren
Conditional Remix & Share Permitted
CC BY-NC-SA
In this unit, aimed at teachers of Physical Education, we begin by looking at some of the common misconceptions relating to fitness and activity levels together with accepted definitions of these concepts. We consider how active young people should actually be, and discuss how PE teachers can ensure they are making an effective contribution to this area of public health.
- Subject:
- Applied Science
- Health, Medicine and Nursing
- Material Type:
- Teaching/Learning Strategy
- Date Added:
- 09/06/2007