Since the 1920s this discrepancy has been explained by the presence of isotopes ; the atomic mass of any isotope is very close to satisfying the whole number rule, with the mass defect caused by differing binding energies being significantly smaller.

Since the 1920s, Oxford has been the most popular candidate among " anti-Stratfordians ," a collective term for adherents of the various alternative-authorship theories.

Since the 1920s, Prime Ministers have typically been conferred the Grand Cordon of the Order of the Rising Sun, or the Grand Cordon of the Order of the Paulownia Flowers ( until 2003 a special higher class of the Order of the Rising Sun ), depending on tenure and eminence.

Since the production of high-quality semiconductor materials was still decades away, Lilienfeld's solid-state amplifier ideas would not have found practical use in the 1920s and 1930s, even if such a device were built.

Since the 1920s, it has experienced rapid growth and established many industries for agricultural products and machinery, textiles, pharmaceuticals, metal products, and services.

Since the 1920s, X-ray diffraction has been the principal method for determining the arrangement of atoms in minerals and metals.

Since the end of the 20th century, the economic strength during the 1920s has drawn close comparison with the 1950s and 1990s, especially in the United States of America.

Since the 1920s, the appearance of the " modern girl " ( moga ) and " modern boy " ( mobo ) saw an increase in the number of women taking on the role of industrial and white-collar workers and consumers.

Since the 1920s, Lancaster had been the much larger and principal community of the Antelope Valley, as well as the rest of California's Mojave Desert.

Since the 1960s Leiston became famous outside the UK as the home of the Summerhill School, founded by A. S. Neill in the 1920s, which was the first major " free school "-referring to freedom in education.

Since the district's period of significance extends to 1944, most of those buildings erected after the 1920s were built as infill within the areas already subdivided by the 1920s.

Since the district's period of significance extends to 1944, most of those buildings erected after the 1920s were built as infill within the areas already subdivided by the 1920s.

Since the early 1920s, 150 movies and about a dozen television shows have been filmed here, including Tom Mix films, Hopalong Cassidy films, The Gene Autry Show, and The Lone Ranger.

Since the 1920s, the economy has been based primarily on agriculture.

Since the 1920s, an increasingly elaborate sub-culture of organized science fiction fandom has arisen, initially among correspondents to the letter columns of science fiction magazines.

Since the 1920s, Governors-General have acted solely on the advice of the local ministers, rather than on that of the British Government.

Since the 1920s the Wallabies have worn green and gold jerseys.

Since the late 1920s the tension between the air and naval services had declined.

Since the 1920s, the street's name has been synonymous with the American advertising industry.

Since the early 1920s, this modern vernacular form has been the standard style of writing for speakers of all varieties of Chinese throughout mainland China, Taiwan, Malaysia and Singapore as the written form of Modern Standard Chinese.

Since late 1920s, nearly all Chinese newspapers, books, and official and legal documents have been written in vernacular Chinese using the national standard.

Since the 1920s, 1.

Since two of these could be trustees of the college, actually it would be necessary to have the consent of only one elected official to impose a levy of millions of dollars of tax revenue.

Since accurate base maps are necessary for any planning program, the first step taken by the planning division to implement the long-range state plan has been to prepare two series of base maps -- one at a scale of 1 inch to a mile, and the second a series of 26 sheets at a scale of 1 inch to 2000 feet, covering the entire state.

A final class of exceptional lines is identifiable from the following considerations: Since no two generators of Af can intersect, it follows that their image curves can have no free intersections.

Since two curves of symbol Af on Q intersect in Af points, it follows that there are Af lines of Af which are tangent to Aj.

Since Parts 1, and 2, were prepared independently, the abbreviation schemes and the chemical symbols used differ in the two parts.

Since the days when their two thousand pairs of skis outnumbered those assembled anywhere else in the United States, the students have stopped regarding the Olympic Ski Team as another name for their own.

( page 33 ) On the other hand, a little later on he says: `` Since 1692 a great but superficial change has wiped out God's beard and the Devil's horns, but the world is still gripped between two diametrically opposed absolutes.

Since the hero, a sterling and upright fellow, is a rich Brown senior, while two Yalies are cast as virtual rapists, I suppose I should disqualify myself from sitting in judgment on `` Where The Boys Are '', but I shall do nothing of the sort.

Since the 1950s, this type of fiction has to a large extent merged with science fictional tropes involving cross-time travel between alternate histories or psychic awareness of the existence of " our " universe by the people in another ; or ordinary voyaging uptime ( into the past ) or downtime ( into the future ) that results in history splitting into two or more time-lines.

Since complex scalar fields admit two different kinds of annihilation operators, which are related by conjugation, such fields describe charged bosons.

Since the 1960s, composite airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control.

Since the English Reformation, the Church of England has been more explicitly a state church and the choice is legally that of the British crown ; today it is made in the name of the Sovereign by the Prime Minister, from a shortlist of two selected by an ad hoc committee called the Crown Nominations Commission.

Since its video release it has acquired a cult following, along with the other two films in the trilogy.

Since 1990, Bulgaria has an unstable party system, in the past two decades differently dominated by the post-communist Bulgarian Socialist Party or by the right Union of Democratic Forces and recently by the new right-oriented party-Citizens for European Development of Bulgaria.

Since 1961, only two new parties ( Bündnis 90 / Die Grünen and PDS / Die Linke ) have entered the Bundestag.

Since these two constructions are inverses of each other, we can say that every Boolean ring arises from a Boolean algebra, and vice versa.

* Since Big Brother 2, the UK series always opens with a twist which have included the public being able to choose the final housemate out of three possibilities ( Big Brother 2 ), the public voting for a housemate to leave during the first week and then the housemates choosing between the two housemates with the least number of votes ( Big Brother 3 ), First Night Nominations ( Big Brother 4 ), Suitcase Nominations ( Big Brother 5 ), Unlucky Housemate 13 ( Big Brother 6 ), Big Brother Hood ( Big Brother 7 ), an all-female House and the first inclusion of twins as contestants ( Big Brother 8 ), the first couple to enter as housemates and set a secret task to hide their real relationship ( Big Brother 9 ), all " housemates " really being " non-housemates " who had to earn their housemate status ( Big Brother 10 ), a mole entering the House with an " Impossible Task " ( Big Brother 11 ), Jackie Stallone entering a house containing her son's ex-wife ( Celebrity Big Brother 3 ), the entrance of a non-celebrity in a celebrity edition ( Celebrity Big Brother 4 ) and Jade Goody's family announced to be visiting.

Since these are a basis, any quantum state of the particle can be expressed as a linear combination ( i. e., quantum superposition ) of these two states:

Since then, with several relaunches, an increase in funding and resources from the BBC and improvements in digital television technology, the channel has been able to diversify content, with two minute looped bulletins available to view via BBC Red Button, BBC News Online and the BBC's mobile website, alongside individual weather and sport bulletins.

Since this is a second-order differential equation, there must be two linearly independent solutions.

Since the following two hundred years saw the rise of the Classical Greek civilization, which has been enduringly influential in western society, the Battle of Marathon is often seen as a pivotal moment in European history.

Since the late nineteenth century, only two brief periods of violence have marred its democratic development.

Since 1974, the internationally recognised Republic of Cyprus has controlled the south two thirds, and the Turkish Republic of Northern Cyprus the northern one-third.

Since 1964, following clashes between the two communities, the Turkish Cypriot seats in the House remained vacant, while the Greek Cypriot Communal Chamber was abolished.

Since these are two very different referents, the validity of the term has been called into question.