:: If crystal streams " with pleasing murmurs creep ,"

If the waves are propagating through an anisotropic ( i. e., not rotationally symmetric ) medium, for example a crystal, then the phase velocity vector and group velocity vector may point in different directions.

If there is a crystallographic structure to the target, and especially in semiconductor substrates where the crystal structure is more open, particular crystallographic directions offer much lower stopping than other directions.

If the applied voltage is large enough, the liquid crystal molecules in the center of the layer are almost completely untwisted and the polarization of the incident light is not rotated as it passes through the liquid crystal layer.

If the confinement is due many distributed Fresnel reflections, the device is termed a photonic crystal.

If nucleation is favored too much, a shower of small crystallites will form in the droplet, rather than one large crystal ; if favored too little, no crystal will form whatsoever.

* Heavy atom methods ( multiple isomorphous replacement ) – If electron-dense metal atoms can be introduced into the crystal, direct methods or Patterson-space methods can be used to determine their location and to obtain initial phases.

If the crystal were of any reasonable size, the number of electrons ( or holes ) required to be injected would have to be very large, making it less than useful as an amplifier because it would require a large injection current to start with.

If made of glass ( e. g. lead crystal ), it should be free from air bubbles but may be colored.

If absorption of light varies with the angle relative to the optical axis in a crystal then pleochroism results.

If χ < sub > xx </ sub > = χ < sub > yy </ sub > ≠ χ < sub > zz </ sub >, the crystal is known as uniaxial.

) If χ < sub > xx </ sub > ≠ χ < sub > yy </ sub > and χ < sub > xx </ sub > ≠ χ < sub > zz </ sub > the crystal is called biaxial.

If the temperature stays constant at its new value, the pyroelectric voltage gradually disappears due to leakage current ( the leakage can be due to electrons moving through the crystal, ions moving through the air, current leaking through a voltmeter attached across the crystal, etc.

If life develops on these worlds they usually take on many bizarre forms, like living crystal or rock, liquid or gaseous physical states, or incorporeal, dimensional, or energy-based states.

If a signal is strong enough, not even a power source is needed ; building an unpowered crystal radio receiver was a common childhood project in the early decades of AM broadcasting.

If the sample is oriented so that one particular plane is only slightly tilted away from the strongest diffracting angle ( known as the Bragg Angle ), any distortion of the crystal plane that locally tilts the plane to the Bragg angle will produce particularly strong contrast variations.

If you lose your lucky rabbit's foot or magic power crystal you've literally lost your luck or power.

If the sample is tilted with respect to the incident electron beam, one can obtain diffraction patterns from several crystal orientations.

If water is cooled at a rate on the order of 10 < sup > 6 </ sup > K / s, the crystal nucleation can be avoided and water becomes a glass.

If the surface energy as a function of the planes is known, the equilibrium shape of the crystal may be found via the Wulff construction.

If the magma migrates through vertical fractures it produces swarms of dikes that may be expressed at the surface as long, linear cracks ( fossae ) and crater chains ( catenae ).

If a cell migrates to an area in the visual cortex, the cell will adopt the function of its neighboring visual cortex cells, guided by chemical and axonal signals from these cells.

If the same cell migrates to the auditory cortex, it would develop functions related to hearing, regardless of its genetic lineage.

If a planet forms far away from a red dwarf so as to avoid tidal locking, and then migrates into the star's habitable zone after this turbulent initial period, it is possible that life may have a chance to develop.

If the bluff failed and they ran into trouble, Brannon had told the others, they would withdraw -- and he would come after his son another time.

If a work is divided into several large segments, a last-minute drawing of random numbers may determine the order of the segments for any particular performance.

If the existent form is to be retained new factors that reinforce it must be introduced into the situation.

Defoe then commented, `` If they Could Draw that young Gentleman into Their Measures They would show themselves quickly, for they are not asham'd to Say They want only a head to Make a beginning ''.

If `` Jack the Courtier '' is really to be taken as Swift, the following remark is obviously Steele's comment on Swift's change of parties and its effect on their friendship: `` I assure you, dear Jack, when I first found out such an Allay in you, as makes you of so malleable a Constitution, that you may be worked into any Form an Artificer pleases, I foresaw I should not enjoy your Favour much longer ''.

If we go into this Common Market, we might just as well stop talking about Constitutional guarantees, Connally Amendments or, for that matter, conservatism in general.

If he were to go with White, he would be out there two days, not just listening in the dark at some point between here and Papa-san, but moving ever deeper into enemy land -- behind Papa-san -- itself.

If they feel that we are taking a long-term view of their problems and are prepared to enter into reasonably long-term association with them in their development activities, they will be much more likely to undertake the difficult tasks required.

If you walk into the ring because it is fun to show your dog, he will feel it and give you a good performance!!

If you run into excess plug fouling on one truck, check to be sure that the rig has a thermostat.

`` If you saw the drama called Rhinoceros '', I said, `` think of the effect it would have on an audience of rhinos when the actor on stage suddenly begins turning into a rhinoceros.

If such is the case, the particles within a distance of about Af of the Earth will have, relative to the Earth, a kinetic energy less than their potential energy and they will be captured into orbits about the Earth.

If goodness and badness lie in attitudes only and hence are brought into being by them, those men who greeted death and misery with childishly merry laughter are taking the only sensible line.

If pressed by the sitter for more detail, she may be able to bring the picture more into focus and see more sharply, almost as if she were physically going closer.

If the house is not wired adequately for electricity or if plumbing or a central heating system must be installed, check into the cost of making these improvements.

If this aspect of death as punishment is not distinguished from the idea of death as natural termination, the conclusion seems inevitable that temporal existence itself is a form of punishment rather than the state into which man is put by the will of the Creator.

If we are born of God we grow in ( not into, but in ) grace.

If they say I could have stopped her it is because they are ignorant of her last weeks of self-examination, her search into herself and its conclusions.

If these allegiances come into conflict, he or she may be guilty of treason against one or both.

If the demands of these two sovereigns upon his duty of allegiance come into conflict, those of the United States have the paramount authority in American law ; likewise, those of the foreign land have paramount authority in their legal system.

If the media agency responsible for the authorized production allows material from fans, what is the limit before legal constraints from actors, music, and other considerations, come into play?

If the steel is cooled slowly, the iron will gradually change into its low temperature allotrope.

If this entailed transforming the West Saxon fyrd from a sporadic levy of king's men and their retinues into a mounted standing army, so be it.

If the Christian faith fell into ruin in his kingdom, if the clergy were too ignorant to understand the Latin words they butchered in their offices and liturgies, if the ancient monasteries and collegiate churches lay deserted out of indifference, he was answerable before God, as Josiah had been.

If the square mile is divided into quarters, each quarter has a side length of mile ( 880 yards ) and is square mile in area, or 160 acres.