The most widely used technique to treat pulpal and periapical diseases To remove the infected substances To obturate canal in three dimension

Intensive stud Lighten Your Load and save Your life Para.1 If you often feel angry and overwhelmed, like the stress in your life is spinning out of control, then you may be hurting your heart. Para. 2 If you dont want to break your own heart, you need to learn to take charge of your life where you can-and recognize there are many things beyond your control

Ⅱ. Listening skills Listening for Telephone numbers 1. W: I' m wondering if the weather will be good for us to go cycling on Saturday M: Let's call the weather office. I know the phone number. It's 661-3047. If the weather is going to be bad, we'll have to wait for another week Q: What's the phone number for the weather office?

The telemetry, tracking and control subsystem provides vital communication to and from the spacecraft TT&C is the only way to observe and to control the spacecraft’s functions and condition from the ground October 29, 2003 Massachusetts Institute of Technology

Space Systems Laboratory Massachusetts Institute of Technology Objective and Outline Objective and Outline Objective : To determine the optimal trajectories to re￾orient a cluster of spacecraft Motivation : To maximize the full potential of a cluster of spacecraft with minimal resources

Colloidal thrusters are electrostatic accelerators of charged liquid droplets. They were first proposed and then intensively studied from around 1960 to 1975 as an alternative to normal ion engines. Their appeal at that time rested with the large “molecular mass” of the droplets, which was known to increase the thrust density of an ion engine

1. Introduction Hall thrusters are electrostatic ion accelerators in which the grid system (which serves in classical ion engines to anchor the negative charges used to accelerate the ions) is replaced with a relatively strong magnetic field perpendicular to the flow

It may be audacious even to attempt a definition of his greatness but it is not so difficult to describe the gifts that enabled him to create imaginative visions of pathos and mirth that, whether read or witnessed in the theatre, fill the mind and linger there he is a writer of great intellectual rapidity

The first three types of control devices we consider--gravity settlers, cyclone separators, and electrostatic precipitators--all function by driving the particles to a solid wall, where they adhere to each other to form agglomerates that can be removed from the collection device and disposed of. Although these devices look different from one another, they all use the same general idea and are described by the same general design equations

Solid wastes include all solid or semisolid materials that the possessor no longer considers of sufficient value to retain. The management of these waste materials is the fundamental concern of all the activities encompassed in solid waste management—whether the planning level is local, regional or subregional, or state and federal. For this reason, it is important to know as much about municipal solid waste (MSW) as possible. The purpose of this chapter is to identify the sources, types, and composition of solid wastes