Posts filled under #amber

Fiyat; 134.99 
Grcistan o

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[170319] jessica.syj inst

[170319] jessica.syj instastory update with Krystal . Omo.. who's this cutie pie bunny? Soojung wore a headband is the cutest! Bunny Jung, look at here, juseyoong! So adorable Jungsis was baking peanut butter chocho chips cookie And the one who made it was our princess Jung Krystal. @vousmevoyez # #fx #victoria #songqian #amber #luna #krystal #MeU # # # # #CNBLUE #Boice #theheirs #hyukstal @mr_kanggun #KangMinHyuk #KrystalJung #JungSooJung #Minhyuk #theinheritors #brideofwatergod #7thminialbum #7CN #doctorc #jungsisters #jungsis

13 mm green almond shape

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An extract on #amber

The term AMBER force field generally refers to the functional form used by the family of AMBER force fields. This form includes several parameters; each member of the family of AMBER force fields provides values for these parameters and has its own name.

The functional form of the AMBER force field is V ( r N ) = bonds k b ( l l 0 ) 2 + angles k a ( 0 ) 2 {\displaystyle V(r^{N})=\sum _{\text{bonds}}k_{b}(l-l_{0})^{2}+\sum _{\text{angles}}k_{a}(\theta -\theta _{0})^{2}} + torsions n 1 2 V n [ 1 + cos ( n ) ] {\displaystyle +\sum _{\text{torsions}}\sum _{n}{\frac {1}{2}}V_{n}[1+\cos(n\omega -\gamma )]} + j = 1 N 1 i = j + 1 N f i j { i j [ ( r 0 i j r i j ) 12 2 ( r 0 i j r i j ) 6 ] + q i q j 4 0 r i j } {\displaystyle +\sum _{j=1}^{N-1}\sum _{i=j+1}^{N}f_{ij}{\biggl \{}\epsilon _{ij}{\biggl [}\left({\frac {r_{0ij}}{r_{ij}}}\right)^{12}-2\left({\frac {r_{0ij}}{r_{ij}}}\right)^{6}{\biggr ]}+{\frac {q_{i}q_{j}}{4\pi \epsilon _{0}r_{ij}}}{\biggr \}}} Despite the term force field, this equation defines the potential energy of the system; the force is the derivative of this potential relative to position. The meanings of right hand side terms are: First term (summing over bonds): represents the energy between covalently bonded atoms. This harmonic (ideal spring) force is a good approximation near the equilibrium bond length, but becomes increasingly poor as atoms separate. Second term (summing over angles): represents the energy due to the geometry of electron orbitals involved in covalent bonding. Third term (summing over torsions): represents the energy for twisting a bond due to bond order (e.g., double bonds) and neighboring bonds or lone pairs of electrons. One bond may have more than one of these terms, such that the total torsional energy is expressed as a Fourier series. Fourth term (double summation over i {\displaystyle i} and j {\displaystyle j} ): represents the non-bonded energy between all atom pairs, which can be decomposed into van der Waals (first term of summation) and electrostatic (second term of summation) energies. The form of the van der Waals energy is calculated using the equilibrium distance ( r 0 i j {\displaystyle r_{0ij}} ) and well depth ( {\displaystyle \epsilon } ). The factor of 2 {\displaystyle 2} ensures that the equilibrium distance is r 0 i j {\displaystyle r_{0ij}} . The energy is sometimes reformulated in terms of {\displaystyle \sigma } , where r 0 i j = 2 1 / 6 ( ) {\displaystyle r_{0ij}=2^{1/6}(\sigma )} , as used e.g. in the implementation of the softcore potentials. The form of the electrostatic energy used here assumes that the charges due to the protons and electrons in an atom can be represented by a single point charge (or in the case of parameter sets that employ lone pairs, a small number of point charges.)

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