rua idume. Absolute zero is the lowest limit of the thermodynamic temperature scale; a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin. rua idume

 
 Absolute zero is the lowest limit of the thermodynamic temperature scale; a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvinrua idume Rubidium hydroxide hydrate; CAS Number: 12026-05-0; EC Number: 215-186-0; Synonyms: Rubidium hydroxide,Rubidium(1+) hydroxide hydrate; Linear Formula: RbOH · xH2O; find Sigma-Aldrich-401293 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-AldrichRubidium hydrogen sulphate | RbHSO4 or HO4RbS | CID 23689122 - structure, chemical names, physical and chemical properties, classification, patents, literature

Listing details: 1 bedroom, 1 bathroom, 25 sq m. As coordenadas geográficas de Rua Jaboti são latitude -22. 99% (trace metals analysis) Synonym (s): Carbonic acid dirubidium, Dirubidium carboxide. 99, 24. Use Coulomb's law to estimate the average distance between the rubidium nucleus and the 5s electron. 8 years) suffering from major depression who had been treated with 360/720 mg/die rubidium chloride for 60 days. The atomic number is equal to. They both have similar reactions. #687 opened 5 days ago by Charismara. 999 g/mol. Rubidium hydride is the hydride of rubidium. 2) Photoelectric Cells. 1. Original Repo info. One is to use a mixed reaction of rubidium hydroxide and hydriodic acid/hydrogen iodide:. 25–1. Each entry has a full citation identifying its source. • 1 yr. Based around an atomic clock, the IQRB-1 delivers an accuracy of ±0. Rubidium compounds are often used in the fireworks to give them a red color. 5 baths, 3073 sq. EDIT: Changed my post to say that Rubidium. 8. grating,producingafree-spacebeamdiameterof320um 44 and3mm45 and used as a probebeamin a rubidium spectroscopy reference 46 and micrometer-size focused beams for ion-trap quantum computing 47. This is done by moving the sliders or typing in numbers into the text inputs. Block in periodic table: s. To write the formula for Rubidium iodide we’ll use the Periodic Table and follow som. 040: Miller, Leopold, et al. Introduction. Rubidium (Rb) valence electronsRubidium acetate | CH3COORb or C2H3O2Rb | CID 23673628 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological. 92. Host your Minecraft server on BisectHosting - get 25% off your first. For a satellite navigation system to work correctly, it is necessary that the signals broadcast by the satellites are transmitted synchronously. 1. . 3 oC. Period in periodic table: 5. A Sinai tem o prazer de apresentar esta aconchegante casa localizada na Rua Idumé, uma região estratégica próxima à Estação de Trem de Braz de Pina e ao Merc. . The detectors that can be used with Shimadzu gas chromatographs are shown below. Atomic Number: 37. Rubidium ion | Rb+ | CID 105153 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety. 3. 1 1. Rua Idume está no bairro Braz de Pina, município de Rio de Janeiro, estado do Rio de Janeiro, região Sudeste do Brasil. . 1. Period Number: 5. Use the pull-down boxes to specify states such as (aq) or (s). 76°F) Boiling Point: 961 K (688°C or 1270°F) Density: 1. With over 800 million mods downloaded every. 3 OVERVIEW Rubidium is a soft, ductile, silvery-white metal that melts at 39. 6. [Rb+] Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Melting Point: 312. 15%) and rubidium -87 (atomic mass = 86. It is a rubidium molecular entity and an. 99, and 25. This is obviously a deal-breaker if you use Tinkers in a modpack. 3+1 Pack used: MC Connected CTM I've noticed with Rubidium that the connected textures system used by both Rechiseled and the CTM mod does not function with Rubidium, block textures simply do not connect. A Rua Idume está localizada no bairro Braz de Pina, na cidade de Rio de Janeiro – Rio de Janeiro e de acordo com a nossa base de informações o CEP desse endereço é: 21215300 Veja no Mapa: Você pode verificar o mapa interativo a partir do CEP da Rua Idume: ⇧ Usando o Mapa do Google YouTube. It is a cubic crystal with rock-salt structure. , 2020b; Zhang et al. Phase at Room Temperature: Solid. For neutral rubidium 430684. The electron configuration of rubidium ion (Rb +) is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6. 020274 USD with a 24-hour trading volume of not available. Despite the name, Rubidium Extra is being developed for Embeddium (for the sole reason that it is faster to update). 7) Atomic Clocks. 9 x 10 10 years. Veja também em Rua Idume. They are primarily driven by supply, demand and energy prices. Protons and neutrons have similar mass. Rubidium es un Mod de optimización de juego, que permite obtener más FPS en Minecraft. 4 - watch how to install a new FPS mod 1. 4678. Check the study I found and linked in OP "Rubidium in the food chain". 8286729 e longitude -43. ∙ 1 banho ∙ 40 m² Rua Idume está no bairro Braz de Pina, município de Rio de Janeiro, estado do Rio de Janeiro, região Sudeste do Brasil. 9000 5. Rubidium iodide 99. This is called bromism and can result in central reactions reaching from somnolence to coma, cachexia, exicosis, loss of reflexes or. FALSE Protons are smaller than a neutron or an electron. Use of the information, documents and data from the ECHA website is subject to the terms and conditions of this Legal Notice, and subject to other binding limitations provided for under applicable law, the information, documents and data made available on the ECHA website may be reproduced, distributed and/or used, totally or in part, for non. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Table 1 gives the key target specifications of IRAFS. 5 modpack I made for myself, and I'm trying to use some low end shaders to enhance the way the world works a bit. Our pharmacies are “open formulary” providing customers with a full array of radiopharmaceutical options allowing clinicians to select the products that achieve the highest benefit for their patients. This mod has the same functionality as Reese's Sodium Options, but is for Rubidium (Magnesium may. arathimoteo@hotmail. 1] No tape measure block highlighting with shader. Mods I've installed in both versions: -Rubidium,-Rubidium Extra,-TexTrue's rubidium options,-Magnesium/Rubidium Extras,-Starlight,-Oculus. client. 0. 2. It seems that rubidium tends to increase the length of manic phases and possibly reduces the extremes of mood. 19. Element Rubidium (Rb), Group 1, Atomic Number 37, s-block, Mass 85. The Rb standard is the most inexpensive, compact, and widely produced atomic clock, used to control the frequency of television stations, cell phone base stations, in test equipment, and global navigation satellite systems like GPS. I generally wouldn't recommend using optifine as it leads to a lot of compatability issues. Rubidium bromide 99. This is obviously a deal-breaker if you use Tinkers in a modpack. Rubidium was discovered in 1861 but had extremely limited industrial use until the 1920s. 94. 6) Copper used in electric wires comes in two flavors (isotopes): 63Cu and 65Cu. The satellite base-plate has an operating temperature range of -5 °C to + 15 °C. Given that Stable JEI crashes with Rubidium Extras, you now have to choose between running Alpha JEI to work with Rubidium Extras and no Tinkers integration, or not use Rubidium Extras with stable JEI so that Tinkers integration works. body-centered cubic (bcc) Rubidium is a chemical element; it has symbol Rb and atomic number 37. Also provides the atomic number, element name, base atomic weight and formula weight for the calcutated molecular formula. Be quick to check out this 4 bedroom, 2 bathroom home ready to move in today! The master bedroom comes with the convenience of an ensuite & walk-in robe. An example of this is the create mod: when shaders are used with oculus the contraption rendering breaks. . This Electron configuration is so because rubidium has a total of 37 electrons because its atomic number is precisely 37. 3% of the human genome. 1) Specialty Glasses. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. The half-life (in hours) for 86Rb is mathematically given as. På grund av de ljusa röda linjerna i strålningen valde de ett latinskt namn, rubidus, som har betydelsen mörkröd. Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others. 18. Historically, the most important use for cesium has been in research and development, primarily in chemical and electrical applications. EA (eV) Reference Comment; 0. I have my own Discord server for my mods if you. LocalizedMC / MgRbExtras-i18n Public archive. Apartment location: Rua Idume, Brás de Pina, Região Geográfica Intermediária do Rio de Janeiro - RJ, 21215-100, Brazil. . This can make a huge difference to frame rates for most computers that are not bottle-necked by the. 8 CTM v1. With the addition of Na 2 CO 3, the slag-liquid appeared in the system. Rubidium is the second most reactive metal after cesium and is very soft, with a silvery white lustre. Pulsing crimson veins spread across the creature’s skin. partnered with Rubidium Ltd. Failure to gain weight, ataxia, hyper irritation, skin. Their observation marks the culmination of a period of development of techniques for achieving very low temperatures and the confinement of atoms at those temperatures. The rubidium atomic clock and basic research. 31°C or 102. Rubidium nitrite | RbNO2 or NO2Rb | CID 23690532 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological. 5) Naturally occurring chlorine that is put in pools is 75. 1. 3. 1 2 1 @ ’ = =. Sulfate compounds are salts or esters of sulfuric acid formed by replacing one or both of the hydrogens with a metal. 1 / 4. (8. When rubidium hydrogen carbonate is heated, it decomposes to rubidium carbonate, carbon dioxide, and water vapor. 402. The periodic table is a chart that shows how chemical elements are related to one another. Currently, the process of extracting rubidium from ores has attracted a great deal of attention due to the increasing application of rubidium in high-technology field. and more. Ft. 11 on Modrinth. The exact atomic masses of the rubidium-85 and rubidium-86 isotopes. RbCl. The Lewis dot structure is a way to represent the valence electrons of an atom using dots. Rubidium hydroxide is the inorganic compound with the formula RbOH. OS (=O) (=O) [O-]. 19. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). 9092 amu; abundance = 27. Get Started. Normal mixes [clarification needed] of rubidium are radioactive enough to fog photographic film in approximately 30 to 60 days. The review includes the occurrence of rubidium in various resources, and the processes and mechanism of rubidium extraction from mineral (lepidolite, zinnwaldite, pollucite, kaolin, muscovite and biotite) and brine (salt lake and seawater) resources. #689 opened 16 hours ago by VirtualGaming1. Other Group 1 (IA) elements include lithium, sodium. In this video we'll write the correct formula for Rubidium sulfide (Rb2S). 16. g. [Rb+] Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). IDENTIFICATION. Rubidium oxide is a yellow solid that is a strong base, reacting easily and exothermically with water to form rubidium hydroxide. 2. , 2009). First, as a counterexample, Hydrogen clocks achieve lower Allan deviation (roughly two orders of magnitude) at 1. 5-mm-thick silicon wafer bonded to glass wafers on either side. S. TRUE Protons and electrons have similar mass. . RUBIDIUM . Explanation: In the periodic table, rubidium comes below the potassium, and iodine comes below bromine. Rubidium is obtained as a minor byproduct of. 1. It should have been already fixed since it is resolved by Mojang in 1. 81 10. You'll likely have some weird shader rendering issues, but if you can. Study with Quizlet and memorize flashcards containing terms like Which of the following is soluble in water at 25∘C?, With which of the following will the Potassium ion form an insoluble salt?, The net ionic equation for formation of an aqueous solution of Al(NO3)3 via mixing solid Al(OH)3 and aqueous nitric acid is _____. Ring Road (R40) is a residence building on. The elements in Group 1, including lithium, sodium, potassium,. 3 degrees Celsius) Number of natural isotopes (atoms of the same element. Na rozdíl od předchozích alkalických kovů má větší hustotu než voda. - GitHub - Asek3/Rubidium: Rubidium is an Unofficial Fork of CaffeineMC's "Sodium", made to work with Forge Mod Loader. When the Na 2 CO 3 dosage increased from 0% to 20%, the content of Li 2. Why does rubidium react violently with water? Rubidium is denser than water and so sinks. Idumea is the name given to. RbI Ground state 1s 22s 2p63s23p63d104s24p65s 2S 1/2 Ionization energy 33690. View Price and Availability. 11. Reload to refresh your session. The total number of electrons in a valence shell is called valence electrons. Atomic Number: 37. On-chip vapor dispensing was carried out by laser thermal activation of a. Rubidium is an Unofficial Fork of CaffeineMC's "Sodium", made to work with Forge Mod Loader. It is soft and silvery. 3 Kilo Tons. 1, 1. Geological Survey, Mineral Commodity Summaries, January 2021 . Rubidium is an alkali metal that is silvery-white in appearance and possesses physical and chemical properties similar to those of other alkali metals, such as potassium and cesium. The frequencies ω 0 of the D 2 and D 1 transitions were measured in [6] and [7], respectively (see also [8, 9] for more information on the D 1 transition measurement); the vacuum wavelengths λandthe wavenumbersk L arethen. render. Apartment for rent #62414625. Drug information provided by: Merative, Micromedex® Along with its needed effects, a medicine may cause some unwanted effects. You signed out in another tab or window. 5. It consists of rubidium cations and an equal number of hydroxide anions. Sal temperado como diz o nome é um produto q leva ervas finas,coentro,cominho,alho. Shell structure: 2. The biomedical research sector is adversely affected because of the pandemic, which slowed down new advancements in. 8% trace metals basis; CAS Number: 13446-74-7; EC Number: 236-603-2; Synonyms: Rubidium monofluoride,Rubidium(I) fluoride; Linear Formula: RbF; find Sigma-Aldrich-251429 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich3. Gerhard Hübner and Ernst Jechart established the firm in 1971 and a year later supplied examples of the clock to NRL. Rubidium is a soft, silvery metal. 8) Other Uses of Rubidium and its Salts. If you want to use shaders, then you could try rubidium and oculus. 46. The IQD Frequency Products IQRB-1 high-performance rubidium oscillator offers stability around 1,000 times more accurate than a typical oven controlled crystal oscillator (OCXO). 15%) and rubidium-87 (atomic mass = 86. Rubidium is also used in the study of fundamental particles and in atomic and molecular physics. Apartment for rent #62414625. If the radiation is of the correct frequency, a number of atoms will transition to the other energy state. Rubidium adalah sebuah logam abu-abu keputihan yang sangat lunak dalam golongan logam alkali. SUPPORTS GLANDULAR HEALTH: Rubidium is a trace mineral that helps all glands of the body to function properly. Based on current estimations for the total number of genes, around 400 poreforming ion channel genes can be expected corresponding to about 1. Do not report issues encountered with it to their bug tracker or in their Discord. With over 800 million mods downloaded every month and over 11 million active monthly users, we are a growing community of avid gamers, always on the hunt for the next thing in user-generated content. The vapor-cell atomic clock finds application today in the global positioning system and telecommunications. 19. The rubidium atomic number is equal to 37. 1 Introduction. Supports 1. Both double-cation and triple-cation perovskites containing a combination of methylammonium, formamidinium, cesium, and Rb have been investigated. Ônibus de Rua Carolina Machado próximo ao 359 para Avenida Braz De Pina próximo ao 1047 Duração média 46 min Frequência A cada 10 minutos Estimativa de preço R$ 3 - R$ 5 Site Urbano R$ 5 Ônibus de Rua Carolina Machado próximo ao 359 para Estrada Do Quitungo próximo ao 587 Duração médiaLithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs) are grouped together in the same row of the periodic table, specifically in Group 1 or the alkali metals. However, the origin of such success derived from irreplaceable superiorities brought by Rb + remains ambiguous. Here's the crash report: crash-2023-09-10_16. External resources. CurseForge is one of the biggest mod repositories in the world, serving communities like Minecraft, WoW, The Sims 4, and more. TexTrue's Rubidium Options (TRO) TexTrue's Rubidium Options is an unofficial Forge port fork of FlashyReese's "Reese's Sodium Options", made to work with FML. To improve and miniaturize the humble device for future applications will require a deeper understanding of atomic and chemical physics. 79847 0. Rubidium iodide 99. As coordenadas geográficas de Rua Idume são latitude -22. 2 87RB PHYSICAL AND OPTICAL PROPERTIES 2 because it has a cycling transition that is used for cooling and trapping 87Rb. 5a, and dont use optifine, optiforge or any other "magic fps fix" type mod. 1. 007 - 0. Rubidium hydride is a powerful superbase and reacts violently with water. [Rb+]. Raw materials prices change daily. 11-client. crash-2022-09-17_23. . 46217 downloads. Now, weighted average simply means that each isotope contributes to the average atomic mass of the element proportionally to its percent abundance. , 2007, Li et al. This medicine shows how much blood is getting to your heart muscle when you are resting or exercising (stressed). Dating - Rubidium-Strontium, Geochronology, Method: The radioactive decay of rubidium-87 (87Rb) to strontium-87 (87Sr) was the first widely used dating system that utilized the isochron method. Low-profile, high-performance rubidium oscillator. Stubby spurs of ruidium crystal protrude from the creature’s body. 9. CurseForge is one of the biggest mod repositories in the world, serving communities like Minecraft, WoW, The Sims 4, and more. The K isotopic compositions were measured on the exact same sample aliquots as were. Rubidium - 37 Rb: radii of atoms and ions. /flywheel backend off does al. The atomic number reflects the number of protons an element has in its. 18+ by Sodium. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. Its atomic mass is 85. The rubidium-strontium dating method (Rb-Sr) is a radiometric dating technique, used by scientists to determine the age of rocks and minerals from their content of specific isotopes of rubidium (87 Rb) and strontium (87 Sr, 86 Sr). I'm playing in a custom 1. How to calculate the average atomic mass of element ? To calculate the average atomic mass of element use this. The ground state electronic configuration of neutral rubidium is [ Kr ]. With the formula RbH, it is classified as an alkali metal hydride. It is synthesized by treating rubidium metal with hydrogen. CAS Registry: 7440-17-7. 092 imóveis à venda na Rua Idume, Braz de Pina, Rio de Janeiro - RJ? No Viva Real você encontra muitas ofertas de imóveis à venda na. [7] Rubidium is the first alkali metal in the group to have a density higher than water. 5) Rubidium-82 in Positron Emission Tomography (PET) 6) Satellite Navigation and Communication. This study reveals remarkable. If the abundance of 234U is. Expert-verified. 20. Without the addition of Na 2 CO 3, α-spodumene only transformed into β-spodumene. The resulting absolute 85 Rb/ 87 Rb ratio is 2. It is used in a procedure called a positron emission tomography (PET) scan to help your doctor see an image of your heart. Its atomic number is 37 whereas its atomic mass is 85. This paper reports the on-going development of MEMS-based Rubidium vapor cells for miniaturized frequency standard applications. Embeddium is not supported by CaffeineMC. The latest rubidium update crashes the client when I try to open video settings. It features low phase noise performance. 55 g/cm, what is the radius of the rubidium ion (in pm)? a. Layered perovskites such as Ruddlesden–Popper (RP) perovskites have been intensively studied in the past few years due to its better environmental stability [1-7] and less trend of ion migration. Residential / Apartment ∙ Rua Idume, Rio de Janeiro, 21215-300 is currently listing for sale at R$ 800 ∙ 1 qt. 18. house located at 9932 E Rubidium Ave, Mesa, AZ 85212 sold for $825,000 on Sep 19, 2023. The cells have been fabricated using bulk silicon micromachining process of a 1. 53 percent 35Cl (mass = 34. 19. Rubidium peroxide can be produced by rapidly oxidizing rubidium in liquid ammonia at −50°C. install the Not Enough Crashes mod and retry it. 0. Rubidium sulfide is an inorganic compound and a salt with the chemical formula Rb 2 S. Therefore, it can be said that the ion of rubidium is larger in comparison to potassium ion, and similarly the ion of iodine is larger. 08 T, and the probe laser wavelength is 794. Also included are discussions of hyperfine structure and resonance fluorescence. Fix MC-70850, an invisible chunks issue brought back to MC1. Rubidium is a member of the alkali family. Rubidium was discovered (1861) spectroscopically by German scientists Robert Bunsen and Gustav Kirchhoff and named. It was discovered underneath Ank'Harel by the Allegiance of Allsight and named by the Consortium of the Vermilion Dream after Ruidus because of its red color. 18. MLS# 6575802. 15 °C) is defined as absolute zero. Rubidium has two naturally occurring isotopes, rubidium -85 ( atomic mass = 84. It vigorously reacts with water and combines with the halogens. forked from anthxnymc/MagnesiumExtras. Mod. Download Rubidium 0. Rubidium is up 0. As a result of its drivers which include low-grade chronic inflammation, oxidative. First, the exact atomic mass of each isotope must be obtained. Magnesium Extras adds a lot of features to Magnesium or Rubidium (Forge Sodium) to improve the mod. We update our RBD to USD price in real-time. rubidium, Metallic chemical element that is part of the alkali metal group, chemical symbol Rb, atomic number 37. 4) Rubidium Chloride Uses. Beezy322005. All of the cations currently used in perovskite solar cells abide by the tolerance factor for incorporation into the lattice. Further data for radioisotopes (radioactive isotopes) of rubidium are listed (including any which occur naturally) below. 7. Metal halide perovskite materials have attracted worldwide attention due to their promising application as solar cell absorbers, and have undergone great strides in their development since the first report of a solar cell application appeared. 468. A gradual and significant improvement in depressive symptoms (HDRS and Zung Scale) and anxiety (Stai X1 and HamARS) was. The bromide ion is a central nervous system depressant and chronic exposure produces neuronal effects. Ruidium is a red mineral that emits the power of Alyxian, the Apotheon. The ZBS deposit is mainly hosted in the highly evolved Baishitouquan (BST). Chemistry questions and answers. Directory of services close to Rua Idume, Rio de Janeiro (Zona Norte do Rio de Janeiro: shops,. [8-10] Compared with its 3D counterparts, RP perovskite solar cells (PSCs) generally show lower power conversion efficiencies (PCEs) because. Download Rubidium 0. Fig. Given that Stable JEI crashes with Rubidium Extras, you now have to choose between running Alpha JEI to work with Rubidium Extras and no Tinkers integration, or not use Rubidium Extras with stable JEI so that Tinkers integration works. Rubidium superoxide or Rubidium hyperoxide is a compound with the formula RbO2. 92 × 1010 years. SECTION 1. Step-3: Determine the valence shell and calculate the total electrons. Tariff: Item Number Normal Trade Relations 12–31–19 Alkali metals, other 2805. The first ionization energy of rubidium is 403 kJ/mol. A three-level optically end-pumped model in a hot rubidium vapor cell is demonstrated, which takes into account the hyperfine structure of the ground state, various collisional processes, and the nonlinear absorption of the pump light along. 6/Annex III-7 (b), allowing exemptions of Pb free soldering for. The current CoinMarketCap ranking is #8074, with a live market cap of not available. Reactants. Rubidium (Rb), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. When the vapor density of Rb is 1 × 10 20 m −3, the constant magnetic field intensity is 0. The average atomic mass of an element is determined by taking the weighted average of the atomic masses of its naturally occurring isotopes. IDENTIFICATION. The Rubidium Market size is expected to grow from 6. [] The tunable bandgap energy (E g) of metal halide perovskites has led to one of the most. Rb – e – → Rb +. 710 ± 0. Supports 1. Time: 2023-07-26 11:43:20 Description: Initializing game java. Rubidium does not combine with other elements or ions to create minerals. Rb+ Electron Configuration (Rubidium Ion)In this video we will write the electron configuration for Rb+, the Rubidium ion. 2) Photoelectric Cells. Seperti logam alkali yang lain, logam rubidium bertindak balas dengan pantas apabila bertindak balas dengan air bahkan dengan ais pada suhu -100 C lalu menghasilkan api. Mais de 4. It has 37 protons and 37 electrons. The only stable liquid elemental metal at room temperature is mercury (Hg), which is molten above −38. 59 Rubidium v0.