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loramina123

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I have tried to solve the following ode ...

loramina123 10 Maple
ode differential-equation dsolve
October 04 2017
1 0


 

> 

restart
> 

mu:=0.0025

0.25e-2

 (1)
> 

A:=1*10^(-20); Aprim:=4.46*10^(-20);

1/100000000000000000000

  

0.4460000000e-19

 (2)
> 

eta:=1.003*10^(-3)

0.1003000000e-2

 (3)
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V:=2*10^(-9)

1/500000000

 (4)
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ode:=mu*h(x)*diff(h(x),x,x)+mu*A/(6*pi*h(x)^2)-eta*V

0.25e-2*h(x)*(diff(diff(h(x), x), x))+0.4166666667e-23/(pi*h(x)^2)-0.2006000000e-11

 (5)
> 

ode1:=mu*h(x)^3*diff(h(x),x,x)-eta*V*h(x)^2+mu*A/(6*pi)=0

0.25e-2*h(x)^3*(diff(diff(h(x), x), x))-0.2006000000e-11*h(x)^2+0.4166666667e-23/pi = 0

 (6)
> 

ic1:=h(0)=3/1000000000, D(h)(-0.20e-4)=0,h(-0.20e-4)=1e-9

h(0) = 3/1000000000, (D(h))(-0.20e-4) = 0, h(-0.20e-4) = 0.1e-8

 (7)
> 

dsol1 := dsolve({ic1, ode}, numeric)

Error, (in dsolve/numeric/bvp) system is singular at left endpoint, use midpoint method instead

  
> 

``


 

Download velocity_tehta1.mwvelocity_tehta1.mw

solve ODE equation by dsolve ...

loramina123 10 Maple
solve ode differential-equation
October 13 2016
0 13

I have tried to solve the following ode equation, but I have got error. What is the potencial problem?

http://i65.tinypic.com/xdcl8p.jpg

 

 error

 

Algebraic equation over reals...

loramina123 10 Maple
June 02 2016
0 2

I have problem to get real answer in a simple equation. maple just give me complex answer.

how i can get parametric real answer? Ihave trid this two way but not applicaple.

with(RealDomain); assume(T::real)

My code is:
Qz := 7.39833755306637215940309264474*10^7*sqrt(1/T)*(T-297.2)/T-16242.7935852035929839431551189*sqrt(1/T)/T;

q := (.6096*(299.2-T))/(sqrt(1.60000000000000000000000000000*10^(-9)-r^2)-0.346410161513775458705489268300e-4);

with(RealDomain); assume(T::real);

e := simplify(solve({0 = q-Qz}, {T}))

and the result like:

e := {T = 1/RootOf(-609600000000000000000000000000000000000000000000000000000+(879515018020273730453559011332895956000000000000000000000000000*sqrt(-625000000*r^2+1)-761682348615485390130551939524898425387968750740910059296172487)*Z^5+(-2959335021226548863761237057896000000000000000000000000000000*sqrt(-625000000*r^2+1)+2562859306691152293409465394507279449380503585614734443742000)*_Z^3+182392320000000000000000000000000000000000000000000000000000*_Z^2)^2}

dose anyone hase any opinion?

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