Q(x, t)

a

2

2Q(x, t)

f

(x, t)

t

(x)

x2

(x, t) f (x, t) Q0 (x) (t)

2h

(x c )2

2

exp

;

x 0

1

2

t

G(x, ,t)

h1 h2

4a2

2a2

t

(x )2

h h

(x )2

2

1

exp

exp

;

x 0

4a 2t

h1 h2

4a 2

h2

1

2

1

q exp q(x c ) ,

x 0

h h

2

W (x, , p)

1

1

h2

h1

1

2

q

exp

q(x ) h

h

2

q

exp q(x ) ,

x 0

2a2

1

2

2a2