Dental amalgam Sandra Bērziņa Definitions Amalgam: alloy of mercury with one or more other metals Amalgam alloy: alloy which combines with mercury to form amalgam Dental amalgam alloy: alloy that is combined with mercury to form amalgam used for dental purposes Dental amalgam • Dental amalgam has been the most widely used material for the restoration of posterior teeth due to: – High strength and durability – Ease of use – Good physical characteristics • However‚ its use
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3 Question 1 (Marks: 20) On a straight‚ flat section of road‚ a car follows a truck. Initially (t < 0)‚ both are travelling at speed v0 = 90 k.p.h. The truck maintains constant speed throughout. The car is initially 2.0 seconds behind the truck‚ i.e. for t < 0 the car
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Summary The topic investigated in this report is heat transfer in a concentric tube heat exchanger. A heat exchanger is a device used to transfer heat from a hot fluid to a colder fluid. Heat exchangers are widely used in the petroleum industry for various reasons. Some of the most important reasons are theta heat exchangers increase the process efficiency‚ conserve energy‚ reduce maintenance and provide employee safety among many other reasons. The main objectives of the lab study were to determine
Free Heat transfer Heat Heat transfer coefficient
Silicon Element Silicon is a chemical element with the symbol Si and atomic number 14 and atomic mass is 28. It is a tetravalent metalloid‚ less reactive than its chemical analog carbon‚ the nonmetal directly above it in the periodic table‚ but more reactive than germanium‚ the metalloid directly below it in the table. Controversy about silicon’s character dates to its discovery; it was first prepared and characterized in pure form in 1823. In 1808‚ it was given the name silicium‚ with an -ium
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virtually unbound electrons are free to leave their respective atoms and float around in the space between adjacent atoms‚ they are often called free electrons. Also‚ this relative mobility of electrons within a material is known as electric conductivity. Conductivity is determined by the types of atoms in a material (the number of protons in each atom’s nucleus‚ determining its chemical identity) and how the atoms are linked together with one another. Materials with high electron mobility (many free
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STPM/S(E)960 PEPERIKSAAN SIJIL TINGGI PERSEKOLAHAN MALAYSIA (MALAYSIA HIGHER SCHOOL CERTIFICATE) PHYSICS Syllabus Second Edition This syllabus applies for the 1999 examination and thereafter until further notice. However the form of examination for Physics stated in this booklet was first implemented in the 2001 examination as announced through a circular‚ Pemberitahuan MPM/2(AM)/2000. Teachers/candidates are to advised to contact Majlis Peperiksaan Malaysia for the latest information about the
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Engineering Materials Msc. Shaymaa Mahmood Introduction to Eng. Materials : Since the earliest days of the evolution of mankind ‚ the main distinguishing features between human begins and other mammals has been the ability to use and develop materials to satisfy our human requirements. Nowadays we use many types of materials‚ fashioned in many different ways‚ to satisfy our requirements for housing‚ heating‚ furniture‚ clothes‚ transportation‚ entertainment‚ medical care‚ defense and all the
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Building and the Environemnt Introduction A berm house is a house that is banked with earth. The design and building methods that are used aid the building to require less energy being put into the building when construction is complete and the building is being used as its intended. Construction The Caer Llan berm house was “designed to be “massive” rather than “lightweight”. The use of vast quantities of block‚ concrete‚ etc‚ is intended to act as a stabiliser‚ both structurally
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oHOSPITALS The implementation of sustainable energy systems is an objective of the European Union’s energy policy. This policy aims to support and promote secure energy supplies with a high quality of service at competitive prices and in an environmentally compatible manner. The European Commission DG for Energy and Transport initiates‚ coordinates and manages energy saving policy actions focusing on energy efficiency‚ maintaining and enhancing security of energy supply and international co-operation
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Heat is widely recognized as an excellent tracer for a range of hydro geological processes that can be inferred from temperature-depth measurements in boreholes. (Saar‚ 2011). A cross borehole thermal tracer test is then analyzed to identify fracture zones that are in hydraulic connection between boreholes and to estimate spatially distributed temperature breakthrough in each fracture zone. (T. Read‚ et al‚ 2013). Cone penetration test (CPT) Aim:
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