In the analytical expression of the PEMFC polarization curve, Eq. (16) , the independent variables are the current density, the temperature and the pressure, while the dependent variable is the voltage. Moreover there are a few constants, that usually are called parameters, and some of these are often unknown.
In particularly cold areas, Trachelospermum jasminoides is best grown in patio containers of loam based compost, such as John Innes No.2, that can be moved to a protected position over winter. Provide the twining stems with an appropriate support such as trellis, wires or a free standing climbing frame.row star jasmine plants in frost-free conditions until large enough to plant outdoors. When they are well grown, plant Trachelospermum jasminoides in fertile, well drained soil in sun or semi-shade. Choose a sheltered position that is protected from cold winter winds.
A tender perennial is unlikely to survive any frost; a half-hardy perennial may be able to survive the same frost that killed the tender perennial. There are no absolute temperature values to discuss when assessing the cold tolerance of perennials.f these herbaceous perennials, hardy plants are those most likely to survive the winter. Tender perennials are the plants least likely to survive the winter, and half-hardy perennials survive better than tender perennials but not as well as hardy perennials.