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Sandusky High School (SHS) is a secondary school in Sandusky, Ohio, United States. It is the only high school in the Sandusky City School District, and one of two high schools in the city of Sandusky; the other high school is St Mary Central Catholic High School.

SHS was one of the first high schools established in the state of Ohio, with the first building commissioned in 1845. The first class - just four students - graduated in 1855. The facility is one of the largest secondary schools, under one roof, in the state of Ohio.

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The International Society of Arboriculture, commonly known as ISA, is an international non-profit organization headquartered in Atlanta, Georgia, United States. Its mission statement is: "Through research, technology, and education, the International Society of Arboriculture (ISA) promotes the professional practice of arboriculture and fosters a greater worldwide awareness of the benefits of trees."

The International Society of Arboriculture (ISA) serves the tree care industry as a membership association and a credentialing organization that promotes the professional practice of arboriculture. ISA focuses on research, technology, and education to advance best tree care practices and deliver educational publications, services, events, and credentials that provide opportunities for tree care professionals to develop their knowledge, skills, and arboricultural expertise. ISA also works to educate the public about the benefits of trees and the need for proper tree care.

Worldwide, ISA has more than 22,000 members and 31,000 ISA-certified tree care professionals with 59 chapters, associate organizations, and professional affiliates throughout North America, as well as in Asia, Australia, Europe, New Zealand, and South America.

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Touro University California is a private graduate school focused primarily on health professions and located on Mare Island in Vallejo, California. It is part of the Touro College and University System and is jointly administered with its sister campus Touro University Nevada.

The university was founded in 1997 and was originally established in San Francisco as an independent, Jewish-sponsored institution, but relocated to Vallejo. Today, the university confers degrees in graduate studies of various disciplines including education, osteopathic medicine, pharmacy, physician assistant studies, nursing, and public health. The school's campus consists of 44 acres (18 ha) and 23 buildings of the former Mare Island naval base located east of the San Pablo Bay. Although sponsored by a Jewish organization, the school has a diverse student body of about 1,400 students as well as 100 faculty members.

The Technical University of Crete (TUC; Greek: Πολυτεχνείο Κρήτης, Polytechneio Kritis) is a state university under the supervision of the Greek Ministry of Education and was founded in 1977 in Chania, Crete. The first students were admitted in 1984. The purpose of the institution is to conduct research, to provide under-graduate and graduate educational programs in modern engineering fields as well as to develop links with the Greek industry.

The Technical University of Crete ranks highly among the Greek technical universities in terms of research productivity, research funding, scientific publications and citation per faculty member.

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In physics, gravitational acceleration is the acceleration of an object in free fall within a vacuum (and thus without experiencing drag). This is the steady gain in speed caused exclusively by the force of gravitational attraction. At a fixed point on the Earth's surface, all bodies accelerate in vacuum at the same rate, regardless of the masses or compositions of the bodies; the measurement and analysis of these rates is known as gravimetry.

At different points on Earth's surface, the free fall acceleration ranges from 9.764 m/s2 to 9.834 m/s2 depending on altitude, latitude, and longitude. A conventional standard value is defined exactly as 9.80665 m/s2 (approximately 32.17405 ft/s2). Locations of significant variation from this value are known as gravity anomalies. This does not take into account other effects, such as buoyancy or drag.

In thermodynamics, the Gibbs free energy (or Gibbs energy) is a thermodynamic potential that can be used to calculate the maximum reversible work that may be performed by a thermodynamic system at a constant temperature and pressure. The Gibbs free energy ( Δ G = Δ H − T Δ S {\displaystyle \Delta G=\Delta H-T\Delta S} , measured in joules in SI) is the maximum amount of non-expansion work that can be extracted from a thermodynamically closed system (one that can exchange heat and work with its surroundings, but not matter). This maximum can be attained only in a completely reversible process. When a system transforms reversibly from an initial state to a final state, the decrease in Gibbs free energy equals the work done by the system to its surroundings, minus the work of the pressure forces.

The Gibbs energy (symbol G {\displaystyle G} ) is also the thermodynamic potential that is minimized when a system reaches chemical equilibrium at constant pressure and temperature. Its derivative with respect to the reaction coordinate of the system vanishes at the equilibrium point. As such, a reduction in G {\displaystyle G} is necessary for a reaction to be spontaneous at constant pressure and temperature.

The Gibbs free energy, originally called available energy, was developed in the 1870s by the American scientist Josiah Willard Gibbs. In 1873, Gibbs described this "available energy" as: 400 

the greatest amount of mechanical work which can be obtained from a given quantity of a certain substance in a given initial state, without increasing its total volume or allowing heat to pass to or from external bodies, except such as at the close of the processes are left in their initial condition.

The initial state of the body, according to Gibbs, is supposed to be such that "the body can be made to pass from it to states of dissipated energy by reversible processes". In his 1876 magnum opus On the Equilibrium of Heterogeneous Substances, a graphical analysis of multi-phase chemical systems, he engaged his thoughts on chemical-free energy in full.

If the reactants and products are all in their thermodynamic standard states, then the defining equation is written as Δ G ∘ = Δ H ∘ − T Δ S ∘ {\displaystyle \Delta G^{\circ }=\Delta H^{\circ }-T\Delta S^{\circ }} .

The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is electrical conductance, measuring the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S) (formerly called "mho"s and then represented by ℧).

The resistance of an object depends in large part on the material it is made of. Objects made of electrical insulators like rubber tend to have very high resistance and low conductivity, while objects made of electrical conductors like metals tend to have very low resistance and high conductivity. This relationship is quantified by resistivity or conductivity. The nature of a material is not the only factor in resistance and conductance, however; it also depends on the size and shape of an object because these properties are extensive rather than intensive. For example, a wire's resistance is higher if it is long and thin, and lower if it is short and thick. All objects resist electrical current, except for superconductors, which have a resistance of zero.

The resistance R of an object is defined as the ratio of voltage V across it to current I through it, while the conductance G is the reciprocal:

For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R and G are constants (although they will depend on the size and shape of the object, the material it is made of, and other factors like temperature or strain). This proportionality is called Ohm's law, and materials that satisfy it are called ohmic materials.

In other cases, such as a transformer, diode or battery, V and I are not directly proportional. The ratio V/I is sometimes still useful, and is referred to as a chordal resistance or static resistance, since it corresponds to the inverse slope of a chord between the origin and an I–V curve. In other situations, the derivative d V d I {\displaystyle {\frac {\mathrm {d} V}{\mathrm {d} I}}} may be most useful; this is called the differential resistance.

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