VR中体验撞墙 研究人员用电刺激还原物理触觉

?? ???????????????? ← ?????????? → ??????????? Nd ↑ U ↓ (Uqb) ??????? ?????
?????? ?????????
???, ??????, ????????? ??????	??????????, U, ??
????????? ??????	????????????
Group, Period, Block	n/a, 7, f
Appearance	?????? ???? ????;; ?????? ??? ???? ??????? ???? ???????????? ???
????????? ??	238.02891(3) g/mol
????????? ???????	[Rn] 5f3 6d1 7s2
????? ?????????? ???????? ??????	2, 8, 18, 32, 21, 9, 2
??? ?????????
???	solid
????? (?????? ??? ? ????)	19.1 g/cm3
??????? ??? ?????	17.3 ?????/????3
???????	1405.3 K (1132.2 °C, 2070 °F)
??????????	4404 K (4131 °C, 7468 °F)
????? ??? ???	9.14 kJ/mol
??????????? ??? ???	417.1 kJ/mol
??????? ??????	(?? °??) 27.665 ???/(???·??)
????? ??? P/???????? ? ?? ??? ? ?? ?? ?? ??? ?? T/?????? ??????????? 2325 2564 2859 3234 3727 4402
????????? ?????????
???????? ???	orthorhombic
???? ??????	4, 6 (weakly basic oxide)
????? ?????????	1.38 (?????? ?????)
Ionization energies	1st: 597.6 kJ/mol
	2nd: 1420 kJ/mol
????????? ?????????	175 pm
Van der Waals radius	186 pm
???????? ?????????
Magnetic ordering	paramagnetic
Electrical resistivity	(0 °C) 0.280 μΩ·m
??? ?????????	(300 K) 27.5 W/(m·K)
Thermal expansion	(25 °C) 13.9 μm/(m·K)
Speed of sound (thin rod)	(20 °C) 3155 m/s
???? ?? ???????	208 GPa
Shear modulus	111 GPa
Bulk modulus	100 GPa
Poisson ratio	0.23
Mohs hardness	6.0
Vickers hardness	1960 MPa
Brinell hardness	2400 MPa
?? ? ?? ??????? ??????	7440-61-1
??????? ??????????? ?????????
?????? ??????: uranium?? ????????? iso NA half-life DM DE (MeV) DP 232U syn 68.9 y α & SF 5.414 228Th 233U syn 159,200 y SF & α 4.909 229Th 234U 0.0058% 245,500 y SF & α 4.859 230Th 235U 0.72% 7.038×108 y SF & α 4.679 231Th 236U syn 2.342×107 y SF & α 4.572 232Th 238U 99.275% 4.468×109 y SF & α 4.270 234Th
References

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百度 习近平新时代中国特色社会主义思想为人类文明发展贡献中国智慧、中国方案。

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