1 Rinse the mustard greens in water and drain. 2  Trim the stems of the greens and chop, if desired. 3  Place the greens in a skillet over low heat and cover. 4  Steam for 4 to 6 minutes or until the mustard greens are wilted, stirring occasionally so they do not stick to the pan. Rinse the mustard greens in cold water, drain and chop them up. 2  Place a skillet on medium heat and pour 2 to 5 tbsp. ( 3 29.58 to 73.95 ml) (in relation to the amount of mustard greens) of water or broth into the pan.
Electrostatic lens. An electrostatic lens is a device that assists in the transport of charged particles.[1][2][3] For instance, it can guide electrons emitted from a sample to an electron analyzer, analogous to the way an optical lens assists in the transport of light in an optical instrument.
feature of einzel lens is that the has the same constant potential at both the object and image sides that's mean the charged partial energy remains unchanged [1]. The present work has been mainly concentrated on the design of two electrode type electrostatic electron lenses, the trajectory of electron beam through an axially symmetric electrostatic lens[2]. Progress in the calculation of electron optical properties in recent years have been reviewed by [3] and [4]. 2. Theory The trajectory of charge particles through an axially symmetric electrostatic lens field,in terms the axial of potential field V(z) and its first and second derivatives V(z) and V(z) respectively, is given by the following equation[5]