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Dubnium ( Db ) is an artificial element, and thus a standard atomic mass cannot be given.
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Dubnium and Db
Dubnium ( ), is a chemical element with the symbol Db and atomic number 105, named after the town of Dubna in Russia, where it was first produced.
| Db || Dubnium || 104 || Proposed name for rutherfordium.
* Dubnium ( Db ), a chemical element
In recognition of that, in 1997 the chemical element 105 Dubnium ( Db ) was named after the town.
* 105 Dubnium, Db
Dubnium and element
* Hahnium, an element now called Dubnium
* Dubnium in 1970 ( element 105 )
Db and is
** 105. dubnium, Db, an element that is named after the city of Dubna, where the JINR is located.
This score is similar to a piano score, but with an additional convention: The C # above middle C and all notes below are always written in the bass clef, and the Db above middle C and all notes above are always written in the treble clef.
According to the digital music sheet published at musicnotes. com, the song is written in the key of Db Major.
It is abbreviated Db and is divided into 100 cêntimos, although inflation has rendered the cêntimo obsolete.
The longest-lived isotope is < sup > 268 </ sup > Db with a half-life of 32 hours.
Db and standard
Instruments made according to an older pitch standard, used principally in wind-band music, include Db piccolo, soprano flute ( the primary instrument, equivalent to today's concert C flute ), F alto flute, and Bb bass flute.
Db and be
The first isotope to be synthesized was < sup > 261 </ sup > Db in 1968.
Db and .
Based on the results of other cold fusion reactions, they concluded that they were due to < sup > 261 </ sup > Bh and < sup > 257 </ sup > Db respectively.
The assignment of the dubnium activity was later changed to < sup > 258 </ sup > Db, presuming that the decay of bohrium was missed.
They continued their study in 2003 using newly developed bismuth ( III ) fluoride ( BiF < sub > 3 </ sub >) targets, used to provide further data on the decay data for < sup > 262 </ sup > Bh and the daughter < sup > 258 </ sup > Db.
The team successfully detected 8 atoms of < sup > 260 </ sup > Bh decaying by correlated 10. 16 MeV alpha particle emission to < sup > 256 </ sup > Db.
They reported a 9. 40 MeV and a 9. 70 MeV alpha-activity and assigned the decays to the isotope < sup > 260 </ sup > Db or < sup > 261 </ sup > Db:
published a convincing synthesis of < sup > 260 </ sup > Db in the reaction between californium-249 target and nitrogen-15 ions and measured the alpha decay of < sup > 260 </ sup > Db with a half-life of 1. 6 seconds and a decay energy of 9. 10 MeV, correlated with the daughter decay of lawrencium-256:
However, in 1997 they resolved the dispute and adopted the current name, dubnium ( Db ), after the Russian town of Dubna, the location of the Joint Institute for Nuclear Research.
The Dubna-Livermore collaboration has strengthened their claim for the discovery of ununtrium by conducting chemical experiments on the decay daughter < sup > 268 </ sup > Db.
In experiments in June 2004 and December 2005, the dubnium isotope was successfully identified by milking the Db fraction and measuring any SF activities.
* Ernő Dohnányi – String Quartet No. 2 in Db
We are again taken to Db Major.
is and artificial
There is evidence to suggest, in fact, that many authors of the humorous sketches were prompted to write them -- or to make them as indelicate as they are -- by way of protesting against the artificial refinements which had come to dominate the polite letters of the South.
To most observers, there is little doubt that he placed an artificial strait jacket of unity upon the years of Anne's reign which in reality existed only in the pages of his history.
In so far as this goal is achieved, the society becomes more fluid, artificial barriers to social mobility are reduced, and people at the lower end of the social hierarchy share more fully in the material and cultural goods of society.
A woman who undergoes artificial insemination against the wishes of her husband is the unlikely heroine of `` A Question Of Adultery '', yesterday's new British import at the Apollo.
Her whole body is made of highly advanced synthetic jelly silicon and with 60 artificial joints in her face, neck, and lower body ; she is able to demonstrate realistic facial expressions and sing while simultaneously dancing.
Since the evolution of the Aramaic alphabet out of the Phoenician one was a gradual process, the division of the world's alphabets into those derived from the Phoenician one directly and those derived from Phoenician via Aramaic is somewhat artificial.
Turing is widely considered to be the father of computer science and artificial intelligence.
If amber is heated under the right conditions, oil of amber is produced, and in past times this was combined carefully with nitric acid to create " artificial musk " – a resin with a peculiar musky odor.
Another place popular with children is the Parque Papagayo which is a large family park which has life-sized replicas of a Spanish galleon and the space shuttle Columbia, three artificial lakes, aviary, skating rink, rides, go-karts and more.
The epideictic speech in praise of love which Agathon recites in the Symposium is full of beautiful but artificial rhetorical expressions, and has led some scholars to believe he may have been a student of Gorgias.
Analytical chemistry is the study of the separation, identification, and quantification of the chemical components of natural and artificial materials.
To the north of the city is a large artificial lake, called Anasagar with a marble structure known as Baradari.
Lake Foy Sagar is situated in the outskirts of the city, it is a picturesque artificial lake that was created as a famine relief project in 1892.
A more precise way to measure resistance is to place an object within an artificial, uniform stream of air where the velocity is known.
In the field of artificial intelligence, the most difficult problems are informally known as AI-complete or AI-hard, implying that the difficulty of these computational problems is equivalent to solving the central artificial intelligence problem — making computers as intelligent as people, or strong AI.
It is recommended that the tank mimic their natural environment, so artificial or natural rock is highly appreciated.
The Teufelsberg is in fact an artificial hill composed of a pile of rubble from the ruins of World War II.
Disraeli's writing is considered generally interesting, and his books teem with striking thoughts, shrewd maxims, and brilliant phrases which stick in the memory ; on the other hand, he is often considered artificial, extravagant, and turgid.
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