def connect(self): 
        try:
            self.connection = pymongo.Connection(self.host, self.port)
            self.db = self.connection[self.name]
        except AutoReconnect:
            raise DatabaseException("It's not possible connect to the database")
def i1beta_lq(i1, beta, lq, ax=0):
    """creates a surface plot of ld vs i1, beta"""
    if ax == 0:
        _create_3d_axis()
        ax = plt.gca()
    azim = 60
    if 0 < np.mean(beta) or -90 > np.mean(beta):
        azim = -120
    _plot_surface(ax, i1, beta, np.asarray(lq)*1e3,
                  (u'I1/A', u'Beta/°', u'Lq/mH'),
                  azim=azim)