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Mononuclidic element

A mononuclidic element or monotopic element is one of the 21 chemical elements, found on Earth as a single nuclide. This single nuclide will have a characteristic atomic mass. Thus, the element's natural isotopic abundance is dominated either by one stable isotope or by one long-lived isotope. There are 19 elements in the first category, 2 in the second category. A list of the 21 mononuclidic elements is given at the end of this article. Of the 26 monoisotopic elements that, by definition, have only one stable isotope, there exist 7 which are not considered mononuclidic, due to the presence of a significant fraction of a long-lived radioisotope occurring in their natural abundance; these elements are vanadium, indium, europium and rhenium. Mononuclidic elements are of scientific importance because their atomic weights can be measured to high accuracy, since there is minimal uncertainty associated with the isotopic abundances present in a given sample. Another way of stating this, is that, for these elements, the standard atomic weight and atomic mass are the same.

In practice, only 11 of the mononuclidic elements are used in standard atomic weight metrology. These are aluminium, caesium, gold, phosphorus, sodium and thorium. In nuclear magnetic resonance spectroscopy, the three most sensitive stable nuclei are hydrogen-1, fluorine-19 and phosphorus-31. Fluorine and phosphorus are monoisotopic, with hydrogen nearly so. 1H NMR, 19F NMR and 31P NMR allow for identification and study of compounds containing these elements. Trace concentrations of unstable isotopes of some mononuclidic elements are found in natural samples. For example, beryllium-10, with a half-life of 1.4 million years, is produced by cosmic rays in the Earth's upper atmosphere. Such isotopes are used in a variety of forensic applications. Data from Atomic Weights and Isotopic Compositions ed. J. S. Coursey, D. J. Schwab and R. A. Dragoset, National Institute of Standards and Technology. Primordial element Table of nuclides sorted by half-life Table of nuclides Isotope geochemistry Radionuclide List of elements by stability of isotopes

James Henry Gardiner

James Henry Gardiner was an early Australian rules football administrator and public servant. He is known for the pivotal role he played in establishing the North Melbourne Football Club, which now competes in the Australian Football League. For a man who played such a vital role in the nurturing of Australia's national code of football, it is surprising to learn that James Gardiner began his life inconspicuously in the London borough of Deptford, far away from his adopted home of Australia. Born close to the famous Royal Dockyards in 1848, Gardiner had a difficult start to his life growing up during a troubled period in European history. Early on in his childhood his family and sibling made the move from England to the brighter shores of Australia, they settled in North Melbourne where Gardiner spent his childhood shooting ducks on the future site of the Arden St Oval. In 1869 at the young age of 21 years, James Gardiner took a leading part in launching a small sporting enterprise that would burgeon into one of Australia's top football clubs – the North Melbourne Football Club.

By helping to establish a club where the local lads of the district could socialise and keep fit, he had unknowingly started something that would grow to become much bigger. Over several decades, James Gardiner would go on to occupy every position within the club from president to vice president to treasurer, chairman of the match committee and position of delegate to the VFA, he would maintain an active involvement in club affairs at great expense to his personal health. Not much is known of James Gardiner's early exploits as a player; the only contemporary account that survived to this day is an account from The Footballer which described Gardiner as being: "A'Tiger' at working, never tires at following, is a grand place and drop kick, but a trifle rough in play" His approach to the game earnt him the nickname Tiger, which stuck with him through life and characterised his attitude to how he dealt with sport and public life. Gardiner was married twice, was blessed with having six sons and five daughters.

His family lived in the former North Melbourne sub-division of East Hotham. Gardiner had a huge commitment to public life and the community, serving as a local councillor of the City of North Melbourne from 1892 to 1899 and again from 1902 to 1905. in 1894 he was elected Mayor of the City. As city father he helped establish many of the landmarks around North Melbourne in his roles with the Public Works and Parks Committee. Gardiner continued to serve the North Melbourne community as representative of the Hopetoun Ward after 1905, when the City of North Melbourne was merged with the City of Melbourne. Gardiner's abiding vision was to see the club he helped found, rise to compete on the greatest stage in the land. Throughout the late 19th and early 20th centuries, Gardiner was at the forefront of several pushes to have North Melbourne admitted to the VFL. In his position as local councillor, senior football figure and respected public servant in Melbourne, Gardiner campaigned vigorously on North's behalf.

By 1921 North was in crisis, after a planned merger between North and rivals Essendon failed to materialise. The end result was. Rising from his sick bed – at great risk to his personal health – Gardiner headed an unsuccessful delegation to the VFL to plead to have North accepted to that competition. Gardiner sadly would not live to see the fulfillment of his dream. Several weeks he died, on 9 December 3 years before North were promoted to the VFL, he was laid to rest by his old friend Joseph Allison and his body now lies at the Fawkner Cemetery. Dowling, G; the North Story – Official history of the North Melbourne Football Club

Rituraj Singh (actor)

Rituraj Singh is an Indian television actor. He has played his different roles in a number of Indian TV shows like Banegi Apni Baat aired on Zee TV in 1993, Hitler Didi, Warrior High and Adaalat, Diya Aur Baati Hum, he is famous for the role of Balwant Chodhary in the Colors TV serial Laado 2. Singh has worked in theatre in Delhi along with Barry John's Theatre Action Group for 12 years and has been featured in the popular Hindi TV game show, Tol Mol Ke Bol, broadcast on Zee TV. Rituraj Singh is now part of a web series titled'Abhay' which will be available on Zee5; this web series marks the digital debut of Kunal Khemu. Feature filmsShort filmsWebseriesTelevision series Rituraj Singh on IMDb

Boeta Hamman

Christo Lategan'Boeta' Hamman is a South African rugby union player who last played for the Bulls in Super Rugby, the Blue Bulls in the Currie Cup and the Blue Bulls XV in the Rugby Challenge. His regular position is fly-half. Hamman attended Hoër Landbouskool Oakdale in nearby Riversdale, he represented the SWD Eagles at various age groups throughout his school career. After school, Hamman moved to Pretoria to join the Blue Bulls academy, played for them at Under-19 level in 2016 and Under-21 level in 2017, as well as representing local university side UP Tuks in the Varsity Cup competition, he made his first class debut in the 2018 Rugby Challenge, coming on as a replacement in their opening match of the season against the Pumas, made his first start a week against Namibian side the Welwitschias. In July 2018, he was included in the Bulls squad for their final match of the 2018 Super Rugby season against trans-Jukskei rivals the Lions, he made his Super Rugby debut by coming on as a second half replacement

Carl Dreher

Carl Dreher was an electrical engineer, two-time Academy Award-nominated sound engineer, an author who dealt with technical and scientific topics. Directly involved with two technological revolutions—the introduction of radio broadcasting and the development of sound movies—he observed that "No form of communication was safe from the innovative drive of electronics." Dreher was born in Vienna, Austria-Hungary in 1896, emigrated to the United States in 1899. Beginning in 1908 he operated a small amateur radio station while living in the Bronx, in 1916 qualified for a First Class-First Grade commercial radiotelegraph operator's license, he attended Townsend Harris Hall, the City College of New York preparatory school, graduating in 1913. He enrolled at CCNY, where his primary instructor was Dr. Alfred N. Goldsmith; the United States entered World War One in April 1917, Dreher received his B. S. degree in May, a month early, on the condition that he take a civilian position that aided the war effort.

He began employment with the Marconi Wireless Telegraph Company of America, working on war contracts in the company's test shop in Aldene, New Jersey, became a member of the Institute of Radio Engineers. In 1919 American Marconi's assets were purchased by General Electric and reorganized as the Radio Corporation of America. From 1921 to 1923 Dreher worked as an operating engineer at RCA's transatlantic radiotelegraph station located at Riverhead, Long Island. In May 1923, RCA established two showcase broadcasting stations, WJZ and WJY, at "Aeolian Hall" in New York City. Dreher was the facility's chief control operator, but was soon promoted to engineer-in-charge. Drawing on his experiences, he published articles about radio technology and the emerging broadcasting industry, beginning in March 1925, the monthly "As the Broadcaster Sees It" column in Radio Broadcast magazine. In 1922, Dreher had participated in RCA's review of Charles A. Hoxie's system for recording radiotelegraph signals, it was found to be impractical for that purpose, but was developed into the RCA Photophone sound-on-film process for recording movie audio.

In March 1928 an RCA subsidiary was incorporated in order to promote Photophone, Dreher became chief engineer of the new company. In October 1928 RCA joined with Joseph P. Kennedy to form the Radio-Keith-Orpheum movie studio in Hollywood, California. A year Dreher became the new studio's Director of Recording — a promotion that resulted in his salary being doubled. While at RKO, he developed a parabolic microphone, wrote about the changing technological advances. During this time, Dreher was nominated for two Sound Recording Academy Awards, for the films The Gay Divorcee and I Dream Too Much. RKO was formed with the expectation. However, due to the effects of the Great Depression, plus mismanagement and general organizational turmoil, the company went into a bankruptcy receivership that lasted for seven years. Dreher's writing career dated back to early 1915, when he produced a weekly column, "Wireless for Amateurs", for the Rockville Centre Owl. Disillusioned by the chaos of the constant and ineffective reorganizations at RKO, in 1936, at the age of forty, he decided to quit his "job you could do only by sabotaging yourself as a human being", to become a full-time freelance writer.

He was successful in his new career. During World War II, he served as a Major with the Army Air Corps and directing training films. After the war he wrote for multiple publications including Popular Science, The Rotarian and the Journal of the Society of Motion Picture Engineers, in addition to being the science editor for The Nation for the last fifteen years of his life, his final book, Sarnoff: An American Success, was published posthumously in 1977. It is best known for dispelling the myth that in 1912 David Sarnoff, while working as a New York City radiotelegraph operator, had been the first person to hear the distress call sent by the RMS Titanic and had operated as the primary contact in the subsequent communications; the Gay Divorcee I Dream Too Much The Crime of Doctor Hallet Carl Dreher on IMDb

Mearley Brook

Mearley Brook is a minor river in Lancashire, England. It is 4.5 miles long and has a catchment area of 8.79 square miles. The stream rises on Pendle Hill and heads northwest, descending through Mearley Clough, passing Little Mearley Hall and crossing under the A59 Clitheroe Bypass. Close to Upbrooks Farm it turns to the southeast. Nearby it met by a small brook from Bracken Hey and the culvert of another at the Waterloo Bridge, as it enters the centre of Clitheroe. At the Shaw Bridge it is joined by Shaw Brook and continues to the east of the hill topped by Clitheroe Castle. In the south of the town, the river flows into the mill lodge of the old Primrose Mill and into Pendleton Brook nearby at Lower Standen Hey, just before that river joins the River Ribble. Mearley is thought to be from the Old English mǣre lēah, meaning the meadow or clearing at the boundary. Brook is a common name for a stream, most found in southern and central England. Notes Citations