Christo and Jeanne-Claude are artists who work together and create large-scale environment works. These works are temporary and they are removed from the site where they are installed, typically after about two weeks. Christo and Jeanne-Claude choose part of an environment in which to make their art and people then see the whole environment with fresh eyes, even after the artwork has been removed, for it remains in the memories of people who have viewed the transformed environment.

As a whole we tend to think of art in forms of paintings or mostly two dimensional works. But Christo and Jeanne-Claude thought outside the box when creating the art work The Gates. The Gates was a project that the two artists had conceived in 1979. February 2005 the artist’s long awaited design came to life in New York City, at Central Park. The installation consisted of thousands of panels of saffron and color fabric that was suspended from slender post and lintel portals crossing twenty three miles of the walkways in Central Park at intervals of 10 to 15 feet. The artist vision was to create a new and magical environment. The artists wanted the viewers to experience The Gates as a golden ceiling casting warm shadow. The artists wanted the forms to be seen from the buildings surrounding the park, the artists stated “They will seem like a golden river appearing through the bare branches of the trees and highlighting the shape of the footpaths”. Unlike most art works the artists paid for the project themselves, no funding was given to them to complete the project.

Although many viewers embraced the vision of the artists some viewers didn’t take well to this brightly color fabric hanging in a natural setting. Some thought the work was pointless and look as if the park was under construction. One critic went on to say it look like something you would wear during deer season. Another stated “Instead of spending 20 million dollars to ruin the Park with curtains that no...

...Book Report for The Lost Gate by Orson Scott Card
PLOT SUMMARY: Danny North grew up in a family of gods—or at least the poor remnants of the mages who once went by names like Odin, Thor, and Freya. When the gates that led to their home world of Westil were closed by Loki in 632 a.d., the Families lost much of their power. Despite this loss of power, the Families still consider themselves far superior to drowthers, the name they use for humans.
Drekka—mages that possess no magical talent—are considered little better than drowthers, and Danny North fears he is one. But when Danny finally does manifest his ability, it is unfortunately not a cause for celebration. For Danny is a gatemage, which is considered even worse than drekka, and if any of the Families were to learn of him, then he would be immediately killed. So Danny flees the family compound to make his own way in the world, at least until he learns to control his rare gift and hopefully reopen a gate between Mittlegard (Earth) and Westil.
It won’t be easy though. Not only does he face the ordinary dangers of a teenager trying to survive on his own in America, while hiding from mages who would kill him on sight, but there is also the mysterious Gate Thief, who seems determined to keep all gates toWestil closed by stripping gatemages of all their power.
ANALYSIS: The Lost Gate introduces readers to a magic system that is over...

...the output is needed. A half adder consists of two logic gates. These are an AND gate, and an Exclusive OR gate. A diagram of a half adder is shown below.
. Figure 1: Half Adder using XOR and AND gate.
For the design of the half adder, do the following. 1) Create a new project in Quartus. Where it asks for the family or device you wish to target for compilation, select the Cyclone II board. Under the list of available devices, click EP2C35F672C6. 2) Design the half-adder shown in figure 1 in a block diagram file (bdf). Remember that the XOR and AND gates are available by clicking the “Symbol Tool” icon. 3) Compile your design. 1
4) Simulate your design using a vector waveform file. Set your inputs to have every possible combination of adding before simulating. For example, set the inputs in a way that you add all the combination 0+0, 0+1, 1+0, and 1+1. Do your outputs show that the inputs are being added together? 5) In your report, include a logic table for your half-adder.
FULL-ADDER
The main difference between a half-adder (HA) and a full-adder (FA) is that a full adder takes 3 inputs rather than 2. Why is this significant? A full adder can add the same two input bits as a full adder PLUS an extra bit for an incoming carry. This is important for cascading adders together to create N-bit adders. Before we cascade adders together, we will design a simple full-adder. A full-adder is made up...

...Activity 6.3.2 Logic Gates Introduction A two-valued number system is the basis for all of the powerful computers and electronic devices in the world. Those two values are 0 and 1. Everything in the digital world is based on this binary system. While it seems very simple, the binary system is used to create the logic that dictates the actions of complex and simpler digital systems. But how do processors know what to do with all of those 0s and 1s Gates are used.Gates process the 0s and 1s and react based on how they are designed to function. When many gates are combined, computers can solve complex problems by using the logic set forth by the combination and order of the gates. Equipment Logic Gates presentation Gateway To Technology notebook Procedure You will decipher and create logic statements to compare conditions with outputs. Your instructor will present Logic Gates.ppt while you complete this document. Digital Signals Describe how digital signals are represented. The columns below represent 8 segments of time. Each time segment can hold a digital signal. Trace a wave pattern to represent the binary number 10001101. Complete the chart for the NOT Gate. SymbolFunction A logic gate that changes its input logic level to the opposite stateTruth Table A Y 0 1 1 0 Complete the chart for the AND Gate. SymbolFunction SHAPE MERGEFORMAT A...

...Introduction
LOGIC GATES
• Basic Logic Gates • Truth Tables • Logical Functions
Truth Tables Logical Expression Graphical Form G hi l F
Most Difficult Reading Topics
• Logic gates and figuring out how to read them th • Logical Circuit Equivalence • NAND NOR and XOR truth tables • Using the rules to create and read the logic gates using 0's and 1's • Transistor implementation • Difference between positive logic and negative logic
Logic
• Formal logic is a branch of mathematics that deals th ti th t d l with true and false values instead of numbers. • In the mid-19th century, George Bool developed many Logic ideas. • Boolean logic deals with equations where the operators are “AND” or “OR” instead of “add” and “multiply”.
1
Electric Logic
• Logical values can easily be expressed by an electrical circuit. l t i l i it • “True” or “1” can be defined as voltage on a wire while “False” or “0” can be defined as no voltage. We will use positive logic. • Analog values can be anything while digital only has discrete values, 0 or 1 • Electrical devices called “gates” can implement the logical
Logic Gates & Symbols
Note that gates can have more than 2 inputs.
AND gate
• The AND gate is an electronic circuit that gives a true output (1) only if all its inputs are true. A dot (·) is used to show the AND operation i.e. A·B. Note...

...WORKING OF LOGIC GATES
SUBMITTED BY:-
Shamil Choudhury
ROLL__________ No_____________
Karimganj Junior College Of Science
CONTENTS……..
TOPICS Page No
1. CERTIFICATE 1
2. INTRODUCTION 2
3. THEORY 3-4
4. EXPERIMENT 5-6
5. RESULTS 7
6. CONCLUSION. 7
7. ACKNOWLEDGEMENT 8
8. REFERENCE 9
INTRODUCTION
A gate is a digital circuit that follows certain logical relationship
between the input and output voltages. Therefore, they are generally known as logic gates — gates because they control the flow of information. The five common logic gates used are NOT, AND, OR, NAND, NOR. Each logic gate is indicated by a symbol and its function is defined by a truth table that shows all the possible input logic level combinations with their respective output logic levels. Truth tables help understand the behavior of logic gates. These logic gates can be realized using semiconductor devices. Here we will investigate on the working of first three logic gates i.e. OR, AND, and NOT gate.
OBJECTIVE OF THE PROJECT
To demonstrate the working of logic gates using torch bulb, battery and switches.
APPARATUS REQUIRED
To demonstrate the working of the logic gates we...

...A logic gate is an elementary building block of a digital circuit. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binaryconditions low (0) or high (1), represented by different voltage levels. The logic state of a terminal can, and generally does, change often, as the circuit processes data. In most logic gates, the low state is approximately zero volts (0 V), while the high state is approximately five volts positive (+5 V).
There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR.
The AND gate is so named because, if 0 is called "false" and 1 is called "true," the gate acts in the same way as the logical "and" operator. The following illustration and table show the circuit symbol and logic combinations for an AND gate. (In the symbol, the input terminals are at left and the output terminal is at right.) The output is "true" when both inputs are "true." Otherwise, the output is "false."
AND gate
Input 1
Input 2
Output
1
1
1
1
1
The OR gate gets its name from the fact that it behaves after the fashion of the logical inclusive "or." The output is "true" if either or both of the inputs are "true." If both inputs are "false," then the output is "false."
OR gate
Input 1
Input 2
Output
1
1
1
...

...AND GATE
The AND gate is a basic digital logic gate that implements logical conjunction - it behaves according to the truth
table to the right. A HIGH output (1) results only if both the inputs to the AND gate are HIGH (1). If neither or only
one input to the AND gate is HIGH, a LOW output results. In another sense, the function of AND effectively finds
the minimum between two binary digits, just as the OR function finds the maximum. Therefore, the output is always
0 except when all the inputs are 1s.
OR GATE
The OR gate is a digital logic gate that implements logical disjunction - it behaves according to the truth table to the
right. A HIGH output (1) results if one or both the inputs to the gate are HIGH (1). If neither input is HIGH, a LOW
output (0) results. In another sense, the function of OR effectively finds the maximum between two binary digits, just
as the complementary AND function finds the minimum.
AND GATE
The AND gate is a basic digital logic gate that implements logical conjunction - it behaves according to the truth
table to the right. A HIGH output (1) results only if both the inputs to the AND gate are HIGH (1). If neither or only
one input to the AND gate is HIGH, a LOW output results. In another sense, the function of AND effectively finds...

...where I have to control a vehicle barrier gate like this:
Our team has planned to work with Arduino but we are open to other suggestions.
My question is, can I use a DC motor for this sort of task or should I look into AC motors? And what kind of motor should I use? Is this even possible using Arduino?
I looked into some of the tutorials of automated garage door openers which kind of relates to what I am trying to do. But the problem is, most of them use commercial garage door openers which are already built in to the system. So I have no way to know which hardware (specifically, which motor) they used for the purpose.
I have worked with Arduino before so have some idea on how it operates.
Either AC or DC should work, but be careful with either. For control with Arduino or other microcontrollers, the first consideration is isolation. The gate will likely require current and voltage, far outside of an Arduino's capacity.
Perhaps the easiest solution would be to use a relay connected through an opto-isolator (Arduino->opto-isolator->relay->motor) to drive a simple on/off motor. Many other possibilities exists, including motor-dirvers/shields, and servos. However, they are more complex than appears to be needed. Unless you need to control the speed and/or angle of the gate, a simple relay should do the trick.
To pick a motor, consider the weight that needs to be moved, and the power sources available. A balsa wood...