Elementarwellen                                                                    Erklärung zur Grund-Gleichung (deutsch)        Forum (deutsche Kurz-Hilfe)        Umrechner        LM   PSE-Tabelle einblenden Please Select Elements   all   nothing Z=1 Wasserstoff H Z=2 Helium He Z=3 Lithium Li Z=4 Beryllium Be Z=5 Bor B Z=6 Kohlenstoff C Z=7 Stickstoff N Z=8 Sauerstoff O Z=9 Fluor F Z=10 Neon Ne Z=11 Natrium Na Z=12 Magnesium Mg Z=13 Aluminium Al Z=14 Silizium Si Z=15 Phosphor P Z=16 Schwefel S Z=17 Chlor Cl Z=18 Argon Ar Z=19 Kalium K Z=20 Calcium Ca Z=21 Scandium Sc Z=22 Titan Ti Z=23 Vanadium V Z=24 Chrom Cr Z=25 Mangan Mn Z=26 Eisen Fe Z=27 Kobalt Co Z=28 Nickel Ni Z=29 Kupfer Cu Z=30 Zink Zn Z=31 Gallium Ga Z=32 Germanium Ge Z=33 Arsen As Z=34 Selen Se Z=35 Brom Br Z=36 Krypton Kr Z=37 Rubidium Rb Z=38 Strontium Sr Z=39 Yttrium Y Z=40 Zirkon Zr Z=41 Niob Nb Z=42 Molybdän Mo Z=43 Technetium Tc Z=44 Ruthenium Ru Z=45 Rohdium Rh Z=46 Palladium Pd Z=47 Silber Ag Z=48 Cadmium Cd Z=49 Indium In Z=50 Zinn Sn Z=51 Antimon Sb Z=52 Tellur Te Z=53 Jod J Z=54 Xenon Xe Z=55 Cäsium Cs Z=56 Barium Ba Z=57 Lanthan La Z=58 Cer Ce Z=59 Praseodym Pr Z=60 Neodym Nd Z=61 Promethium Pm Z=62 Samarium Sm Z=63 Europium Eu Z=64 Gadolinium Gd Z=65 Terbium Tb Z=66 Dysprosium Dy Z=67 Holmium Ho Z=68 Erbium Er Z=69 Thulium Tm Z=70 Ytterbium Yb Z=71 Lutetium Lu Z=72 Hafnium Hf Z=73 Tantal Ta Z=74 Wolfram W Z=75 Rhenium Re Z=76 Osmium Os Z=77 Iridium Ir Z=78 Platin Pt Z=79 Gold Au Z=80 Quecksilber Hg Z=81 Thallium Tl Z=82 Blei Pb Z=83 Wismut Bi Z=84 Polonium Po Z=85 Astatin At Z=86 Radon Rn Z=87 Francium Fr Z=88 Radium Ra Z=89 Actinium Ac Z=90 Thorium Th Z=91 Protactinium Pa Z=92 Uran U Z=93 Neptunium Np Z=94 Plutonium Pu Z=95 Americium Am Z=96 Curium Cm Z=97 Berkelium Bk Z=98 Californium Cf Z=99 Einsteinium Es Z=100 Fermium Fm Z=101 Mendelevium Md Z=102 Nobelium No Z=103 Lawrencium Lr Z=104 Rutherfordium Rf Z=105 Dubnium Db Z=106 Seaborgium Sg Z=107 Bohrium Bh Z=108 Hassium Hs Z=109 Meitnerium Mt Z=110 Darmstadtium Ds Z=111 Roentgenium Rg Z=112 Copernicium Cn Z=113 Ununtrium Uut Z=114 Flerovium Fl Z=115 Ununpentium Uup Z=116 Livermorium Lv Z=117 Ununseptium Uus Z=118 Ununoctium Uuo name off Actual Settings START***1x*x2024-05-21_06:25:07***2x*x17***3x*x57***4x*x0_6_0_0_0***5x*x150***6x*xF_2_0_1***7x*x299792458***8x*x1.616199E-35***9x*x2.7182818284590452353602874713527***10x*x1***11x*x1_2_3_4_5_6_7_8_9_10_11_12_13_14_15_16_17_18_19_20_21_22_23_24_25_26_27_28_29_30_31_32_33_34_35_36_37_38_39_40_41_42_43_44_45_46_47_48_49_50_51_52_53_54_55_56_57_58_59_60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78_79_80_81_82_83_84_85_86_87_88_89_90_91_92_93_94_95_96_97_98_99_100_101_102_103_104_105_106_107_108_109_110_111_112_113_114_115_116_117_118***12x*x3***13x*x7_5_100_100_100***14x*x0_0_0_1_1_1_2_2***END      (SAVE settings with Ctrg-C as txt (Notepad)   or   SAVE as browser-Link ) Search for potenz N and factor2 in selected elements Z, for given result with the multiplikation L*factor2                      L = Z * Cx * Basis^N * Factor                    N = log(L/(Factor*Z*Cx)) / log(Basis) and f=c/L and T=L/c with c= m/s and Comptonwavelength Cx [m]:   Ce= 2.4263102389E-12 Cp= 1.32140985623E-15  Cn= 1.3195909068E-15  Plk= 1.616199E-35  orb_Mercur= 57.91E9 Cx m    Basis   Factor   Basis B with e= 2.7182818284590  phi= 1.618034  or 2 ,   Factor with pi= 3.141592   2pi= 6.283185  g= 0.61803398874989  or 18 show  digits                  Select Units L Length   Lj   pc   AE   earthR   km   m   dm   cm   mm   µm   nm   A~   pm   fm f  Frequency   THz   GHz   MHz   kHz   Hz   mHz   µHz T Time   j   d   h   min   s   ms   µs   ns   ps V Volume =L^3   km^3   m^3   hL=100L   dL=10L   dm^3=L   10ml=cL   cm^3=mL   mm^3=µL m Mass =V*dens.   Mt   kt   t   kg   g   mg   µg   ng   pg   fg        (Reset with deleting the number)      Reset 3 Factor-Search (Example1)      (Example2) 1 Listing - Modus     2 Searching - Modus     3 Factor-Search     4 Basis(+Factor)-Search     5 Basis(+Factor)-Harmonics-Search Value for Searching: MHz      Length search factor2 (integer) with lattice constants: 118L or 118R By using this code as text you call the physical lattice constants and atomic radii from the database, for many Z. If you use the value Factor additional, you can find rational numbers between L and Lattice(Z): 0.333333*ResultF = 1/3*ResultF or Factor=0.5 with Basis>2 error L maximal   0.1% 0.5% 1% 2% 5% all            to top Results (search for N and factors (Factor, factor2, Z and Ce) with 150 MHz)      with Plk      Attention ! Basis 2.7182818284590452353602874713527 B error L[%]   Z N [1m=1m] Factor2 [1MHz=1.0E6Hz] [1s=1s] 2.71 err=-1.12 H Z=1 (80.80) N=79 L=0.3294268 m *6.0669517=150 MHz f=910.04276 MHz T=1.0988494651912E-9 s 2.71 err=-1.12 He Z=2 (80.11) N=79 L=0.6588536 m *3.0334759=150 MHz f=455.02138 MHz T=2.1976989303825E-9 s 2.71 err=-1.12 Li Z=3 (79.70) N=79 L=0.9882803 m *2.0223172=150 MHz f=303.34759 MHz T=3.2965483955737E-9 s 2.71 err=-1.89 Be Z=4 (79.42) N=77 L=0.1783323 m *11.2072617=150 MHz f=1681.08925 MHz T=5.9485241442423E-10 s 2.71 err=-1.87 Be Z=4 (79.42) N=82 L=26.4668552 m /13.2425889=150 MHz f=11.32709 MHz T=8.8283926024495E-8 s 2.71 err=-1.5 B Z=5 (79.19) N=81 L=12.1707649 m /6.0895953=150 MHz f=24.63218 MHz T=4.059730171289E-8 s 2.71 err=-1.55 C Z=6 (79.01) N=76 L=0.0984072 m *20.3096638=150 MHz f=3046.44958 MHz T=3.282509606968E-10 s 2.71 err=-1.12 C Z=6 (79.01) N=79 L=1.9765607 m *1.0111586=150 MHz f=151.67379 MHz T=6.5930967911475E-9 s 2.71 err=-1.55 O Z=8 (78.72) N=76 L=0.1312095 m *15.2322479=150 MHz f=2284.83718 MHz T=4.3766794759574E-10 s 2.71 err=-0.811 F Z=9 (78.61) N=80 L=8.0592735 m /4.0324264=150 MHz f=37.19845 MHz T=2.6882842800972E-8 s 2.71 err=-1.55 Ne Z=10 (78.50) N=76 L=0.1640119 m *12.1857983=150 MHz f=1827.86975 MHz T=5.4708493449467E-10 s 2.71 err=-1.5 Ne Z=10 (78.50) N=81 L=24.3415297 m /12.1791905=150 MHz f=12.31609 MHz T=8.1194603425781E-8 s 2.71 err=-0.71 Na Z=11 (78.40) N=76 L=0.1804131 m *11.0779985=150 MHz f=1661.69977 MHz T=6.0179342794414E-10 s 2.71 err=-1.89 Na Z=11 (78.40) N=77 L=0.4904137 m *4.0753679=150 MHz f=611.30518 MHz T=1.6358441396666E-9 s 2.71 err=-1.55 Mg Z=12 (78.32) N=76 L=0.1968143 m *10.1548319=150 MHz f=1523.22479 MHz T=6.5650192139361E-10 s 2.71 err=-0.3 Si Z=14 (78.16) N=81 L=34.0781416 m /17.0508667=150 MHz f=8.79721 MHz T=1.1367244479609E-7 s 2.71 err=-1.55 P Z=15 (78.09) N=76 L=0.2460179 m *8.1238655=150 MHz f=1218.57983 MHz T=8.2062740174201E-10 s 2.71 err=-1.5 P Z=15 (78.09) N=81 L=36.5122946 m /18.2687858=150 MHz f=8.21073 MHz T=1.2179190513867E-7 s 2.71 err=-0.811 Ar Z=18 (77.91) N=80 L=16.1185470 m /8.0648528=150 MHz f=18.59922 MHz T=5.3765685601944E-8 s 2.71 err=-1.55 Ca Z=20 (77.81) N=76 L=0.3280239 m *6.0928992=150 MHz f=913.93487 MHz T=1.0941698689893E-9 s 2.71 err=-0.378 Ti Z=22 (77.71) N=75 L=0.1327406 m *15.0565610=150 MHz f=2258.48414 MHz T=4.4277485994547E-10 s 2.71 err=-1.89 Ti Z=22 (77.71) N=77 L=0.9808275 m *2.0376839=150 MHz f=305.65259 MHz T=3.2716882793333E-9 s 2.71 err=-1.55 Cr Z=24 (77.62) N=76 L=0.3936286 m *5.0774160=150 MHz f=761.61239 MHz T=1.3130038427872E-9 s 2.71 err=-1.93 Mn Z=25 (77.58) N=75 L=0.1508415 m *13.2497736=150 MHz f=1987.46605 MHz T=5.0315324993804E-10 s 2.71 err=-1.83 Mn Z=25 (77.58) N=80 L=22.3868709 m /11.2011845=150 MHz f=13.39144 MHz T=7.4674563336033E-8 s 2.71 err=-0.811 Co Z=27 (77.51) N=80 L=24.1778206 m /12.0972793=150 MHz f=12.39948 MHz T=8.0648528402915E-8 s 2.71 err=-0.378 Zn Z=30 (77.40) N=75 L=0.1810099 m *11.0414780=150 MHz f=1656.22170 MHz T=6.0378389992565E-10 s 2.71 err=-1.55 Zn Z=30 (77.40) N=76 L=0.4920358 m *4.0619328=150 MHz f=609.28992 MHz T=1.641254803484E-9 s 2.71 err=-0.378 As Z=33 (77.31) N=75 L=0.1991108 m *10.0377073=150 MHz f=1505.65610 MHz T=6.6416228991821E-10 s 2.71 err=-0.0505 As Z=33 (77.31) N=78 L=3.9992482 m /2.0010084=150 MHz f=74.96220 MHz T=1.3340056197141E-8 s 2.71 err=-1.56 Se Z=34 (77.28) N=80 L=30.4461444 m /15.2336109=150 MHz f=9.84665 MHz T=1.01557406137E-7 s 2.71 err=-0.811 Kr Z=36 (77.22) N=80 L=32.2370941 m /16.1297057=150 MHz f=9.29961 MHz T=1.0753137120389E-7 s 2.71 err=-1.65 Rb Z=37 (77.19) N=79 L=12.1887909 m /6.0986145=150 MHz f=24.59575 MHz T=4.0657430212076E-8 s 2.71 err=-0.152 Sr Z=38 (77.17) N=80 L=34.0280438 m /17.0258004=150 MHz f=8.81016 MHz T=1.1350533627077E-7 s 2.71 err=-1.55 Zr Z=40 (77.11) N=76 L=0.6560477 m *3.0464496=150 MHz f=456.96744 MHz T=2.1883397379787E-9 s 2.71 err=-0.99 Nb Z=41 (77.09) N=75 L=0.2473801 m *8.0791303=150 MHz f=1211.86954 MHz T=8.2517132989838E-10 s 2.71 err=-1.26 Tc Z=43 (77.04) N=79 L=14.1653516 m /7.0875791=150 MHz f=21.16379 MHz T=4.7250527003224E-8 s 2.71 err=-1.41 Tc Z=43 (77.04) N=80 L=38.5054179 m /19.2660373=150 MHz f=7.78572 MHz T=1.2844024893798E-7 s 2.71 err=-1.89 Ru Z=44 (77.02) N=77 L=1.9616549 m *1.0188420=150 MHz f=152.82630 MHz T=6.5433765586665E-9 s 2.71 err=-0.0462 Rh Z=45 (77.00) N=74 L=0.0998847 m *20.0092327=150 MHz f=3001.38491 MHz T=3.3317952553944E-10 s 2.71 err=-0.382 Rh Z=45 (77.00) N=77 L=2.0062380 m /1.0038134=150 MHz f=149.43016 MHz T=6.6920896622726E-9 s 2.71 err=-0.811 Rh Z=45 (77.00) N=80 L=40.2963676 m /20.1621321=150 MHz f=7.43969 MHz T=1.3441421400486E-7 s 2.71 err=-0.831 Ag Z=47 (76.95) N=74 L=0.1043240 m *19.1577760=150 MHz f=2873.66640 MHz T=3.4798750445231E-10 s 2.71 err=-0.683 Ag Z=47 (76.95) N=75 L=0.2835821 m *7.0477519=150 MHz f=1057.16279 MHz T=9.4592810988351E-10 s 2.71 err=-0.957 In Z=49 (76.91) N=79 L=16.1419123 m /8.0765436=150 MHz f=18.57230 MHz T=5.3843623794371E-8 s 2.71 err=-0.0462 Sn Z=50 (76.89) N=74 L=0.1109830 m *18.0083095=150 MHz f=2701.24642 MHz T=3.701994728216E-10 s 2.71 err=-1.07 Sn Z=50 (76.89) N=78 L=6.0594670 m /3.0318310=150 MHz f=49.47505 MHz T=2.0212206359305E-8 s 2.71 err=-1.86 Te Z=52 (76.85) N=74 L=0.1154223 m *17.3156822=150 MHz f=2597.35233 MHz T=3.8500745173447E-10 s 2.71 err=-0.378 Cs Z=55 (76.80) N=75 L=0.3318514 m *6.0226244=150 MHz f=903.39366 MHz T=1.1069371498637E-9 s 2.71 err=-0.728 Cs Z=55 (76.80) N=79 L=18.1184730 m /9.0655081=150 MHz f=16.54623 MHz T=6.0436720585519E-8 s 2.71 err=-0.493 Ba Z=56 (76.78) N=74 L=0.1243010 m *16.0788477=150 MHz f=2411.82716 MHz T=4.1462340956019E-10 s 2.71 err=-1.75 Pr Z=59 (76.73) N=74 L=0.1309600 m *15.2612792=150 MHz f=2289.19188 MHz T=4.3683537792949E-10 s 2.71 err=-0.0462 Nd Z=60 (76.71) N=74 L=0.1331796 m *15.0069245=150 MHz f=2251.03868 MHz T=4.4423936738592E-10 s 2.71 err=-1.55 Nd Z=60 (76.71) N=76 L=0.9840716 m *2.0309664=150 MHz f=304.64496 MHz T=3.282509606968E-9 s 2.71 err=-0.545 Pm Z=61 (76.69) N=79 L=20.0950337 m /10.0544726=150 MHz f=14.91873 MHz T=6.7029817376666E-8 s 2.71 err=-0.493 Gd Z=64 (76.64) N=74 L=0.1420583 m *14.0689918=150 MHz f=2110.34876 MHz T=4.7385532521165E-10 s 2.71 err=-1.93 Tb Z=65 (76.63) N=75 L=0.3921880 m *5.0960668=150 MHz f=764.41002 MHz T=1.3081984498389E-9 s 2.71 err=-0.378 Dy Z=66 (76.61) N=75 L=0.3982217 m *5.0188537=150 MHz f=752.82805 MHz T=1.3283245798364E-9 s 2.71 err=-0.0505 Dy Z=66 (76.61) N=78 L=7.9984965 m /4.0020169=150 MHz f=37.48110 MHz T=2.6680112394282E-8 s 2.71 err=-1.57 Ho Z=67 (76.60) N=78 L=8.1196858 m /4.0626535=150 MHz f=36.92168 MHz T=2.7084356521468E-8 s 2.71 err=-0.395 Ho Z=67 (76.60) N=79 L=22.0715944 m /11.0434371=150 MHz f=13.58273 MHz T=7.3622914167814E-8 s 2.71 err=-1.86 Er Z=68 (76.58) N=74 L=0.1509369 m *13.2414040=150 MHz f=1986.21060 MHz T=5.0347128303738E-10 s 2.71 err=-1.9 Er Z=68 (76.58) N=79 L=22.4010212 m /11.2082645=150 MHz f=13.38298 MHz T=7.4721763633005E-8 s 2.71 err=-0.381 Tm Z=69 (76.57) N=74 L=0.1531566 m *13.0494996=150 MHz f=1957.42494 MHz T=5.1087527249381E-10 s 2.71 err=-0.271 Ta Z=73 (76.51) N=79 L=24.0481551 m /12.0324016=150 MHz f=12.46634 MHz T=8.0216010958961E-8 s 2.71 err=-1.4 W Z=74 (76.50) N=74 L=0.1642549 m *12.1677767=150 MHz f=1825.16650 MHz T=5.4789521977597E-10 s 2.71 err=-1.65 W Z=74 (76.50) N=79 L=24.3775819 m /12.1972291=150 MHz f=12.29788 MHz T=8.1314860424152E-8 s 2.71 err=-0.0462 Re Z=75 (76.49) N=74 L=0.1664745 m *12.0055396=150 MHz f=1800.83095 MHz T=5.552992092324E-10 s 2.71 err=-0.165 Au Z=79 (76.43) N=79 L=26.0247158 m /13.0213662=150 MHz f=11.51953 MHz T=8.6809107750109E-8 s 2.71 err=-1.44 Hg Z=80 (76.42) N=79 L=26.3541426 m /13.1861936=150 MHz f=11.37553 MHz T=8.79079572153E-8 s 2.71 err=-1.06 Tl Z=81 (76.41) N=74 L=0.1797925 m *11.1162404=150 MHz f=1667.43606 MHz T=5.99723145971E-10 s 2.71 err=-0.99 Pb Z=82 (76.40) N=75 L=0.4947603 m *4.0395651=150 MHz f=605.93477 MHz T=1.6503426597968E-9 s 2.71 err=-0.657 Bi Z=83 (76.38) N=78 L=10.0587153 m /5.0328394=150 MHz f=29.80425 MHz T=3.3552262556446E-8 s 2.71 err=-1.87 Po Z=84 (76.37) N=78 L=10.1799046 m /5.0934760=150 MHz f=29.44944 MHz T=3.3956506683632E-8 s 2.71 err=-0.0738 At Z=85 (76.36) N=79 L=28.0012765 m /14.0103307=150 MHz f=10.70639 MHz T=9.3402204541256E-8 s 2.71 err=-1.26 Rn Z=86 (76.35) N=79 L=28.3307033 m /14.1751581=150 MHz f=10.58189 MHz T=9.4501054006447E-8 s 2.71 err=-1.18 Ac Z=89 (76.31) N=74 L=0.1975498 m *10.1170278=150 MHz f=1517.55417 MHz T=6.5895506162245E-10 s 2.71 err=-0.0462 Th Z=90 (76.30) N=74 L=0.1997694 m *10.0046164=150 MHz f=1500.69245 MHz T=6.6635905107888E-10 s 2.71 err=-0.382 Th Z=90 (76.30) N=77 L=4.0124760 m /2.0076269=150 MHz f=74.71508 MHz T=1.3384179324545E-8 s 2.71 err=-1.5 Pa Z=91 (76.29) N=77 L=4.0570591 m /2.0299339=150 MHz f=73.89403 MHz T=1.3532892428151E-8 s 2.71 err=-1.1 U Z=92 (76.28) N=79 L=30.3072640 m /15.1641226=150 MHz f=9.89177 MHz T=1.0109415079759E-7 s 2.71 err=-0.957 Cf Z=98 (76.22) N=79 L=32.2838246 m /16.1530871=150 MHz f=9.28615 MHz T=1.0768724758874E-7 s 2.71 err=-1.06 Es Z=99 (76.21) N=74 L=0.2197464 m *9.0951058=150 MHz f=1364.26587 MHz T=7.3299495618677E-10 s 2.71 err=-0.0505 Es Z=99 (76.21) N=78 L=11.9977447 m /6.0030253=150 MHz f=24.98740 MHz T=4.0020168591423E-8 s 2.71 err=-1.99 Es Z=99 (76.21) N=79 L=32.6132514 m /16.3179146=150 MHz f=9.19235 MHz T=1.0878609705393E-7 s 2.71 err=-0.0462 Fm Z=100 (76.20) N=74 L=0.2219660 m *9.0041547=150 MHz f=1350.62321 MHz T=7.403989456432E-10 s 2.71 err=-1.07 Fm Z=100 (76.20) N=78 L=12.1189341 m /6.0636619=150 MHz f=24.73753 MHz T=4.0424412718609E-8 s 2.71 err=-0.836 Rf Z=104 (76.16) N=79 L=34.2603853 m /17.1420517=150 MHz f=8.75041 MHz T=1.1428034437989E-7 s 2.71 err=-1.81 Db Z=105 (76.15) N=79 L=34.5898121 m /17.3068791=150 MHz f=8.66707 MHz T=1.1537919384508E-7 s 2.71 err=-1.3 Mt Z=109 (76.11) N=75 L=0.6576692 m *3.0389389=150 MHz f=455.84084 MHz T=2.1937481697299E-9 s 2.71 err=-0.378 Ds Z=110 (76.10) N=75 L=0.6637028 m *3.0113122=150 MHz f=451.69683 MHz T=2.2138742997274E-9 s 2.71 err=-0.728 Ds Z=110 (76.10) N=79 L=36.2369460 m /18.1310162=150 MHz f=8.27312 MHz T=1.2087344117104E-7 s 2.71 err=-1.4 Rg Z=111 (76.09) N=74 L=0.2463823 m *8.1118511=150 MHz f=1216.77767 MHz T=8.2184282966396E-10 s 2.71 err=-1.65 Rg Z=111 (76.09) N=79 L=36.5663728 m /18.2958436=150 MHz f=8.19858 MHz T=1.2197229063623E-7 s 2.71 err=-0.493 Cn Z=112 (76.08) N=74 L=0.2486019 m *8.0394239=150 MHz f=1205.91358 MHz T=8.2924681912039E-10 s 2.71 err=-0.484 Lv Z=116 (76.05) N=78 L=14.0579635 m /7.0338478=150 MHz f=21.32545 MHz T=4.6892318753587E-8 s 2.71 err=-0.632 Lv Z=116 (76.05) N=79 L=38.2135067 m /19.1199807=150 MHz f=7.84520 MHz T=1.2746653796218E-7 s 2.71 err=-1.35 Uus Z=117 (76.04) N=78 L=14.1791528 m /7.0944844=150 MHz f=21.14319 MHz T=4.7296562880773E-8 s 2.71 err=-1.5 Uus Z=117 (76.04) N=79 L=38.5429335 m /19.2848081=150 MHz f=7.77814 MHz T=1.2856538742738E-7 s 41 Treffer,mit factor2: 3(1),3(2*),3(2/),4(3*),1(3/),3(5*),2(5/),1(7*),3(7/),bei Basis=2.7182818284590452353602874713527, Cx=1.616199E-35, Factor=1, c=299792458, genau=2%, mod=3, Suchwort=150 MHz                                                                 info@aladin24.de, www.torkado.de