β

ε ( t )

d ε d t

w ( t )

d w d t

V ( t )

d V d t

< β < 0

ε ( t ) 0

t

<0

w ( t )

t

>0

V ( t ) 0

t

<0

β = 0

ε ( t ) 0

t

<0

w ( t )

t

>0

V 0

0

0 < β < 5 3

ε ( t ) 0

t

<0

w ( t )

t

>0

V ( t )

t

>0

β = 5 3

ε ( t ) 0

t

Exponentially

<0

w ( t )

t

Exponentially

>0

V ( t )

t

Exponentially

>0

5 3 < β < 2

ε ( t ) 0

t t 1

<0

w ( t )

t t 1

>0

V ( t )

t t 1

>0

β = 2

ε ( t ) = 1

0

w ( t )

t t 1

>0

V ( t )

t t 1

>0

2 < β <

ε ( t )

t t 1

>0

w ( t )

t t 1

>0

V ( t )

t t 1

>0