Digital Commons Network^™

Le Roman De Flamenca: History And Literary Convention, Paul A. Olson

Department of English: Faculty Publications

That Le Roman de Flamenca is ultimately concerned with the history of heterodox culture in Provence during the thirteenth century has been both affirmed and denied by competent Provencal scholars. To complicate matters, the earliest work to suggest relationships between history and this romance, a study by Paul Grimm, attempted to show that the final tournament has to do with ambiguous events which took place between 1196 and 1200.2 If the Provencal past has a bearing on Flamenca, it is important that we should understand just what aspects of that epoch the poem treats and from what point of …

Physics, Chapter 35: Electronics, Henry Semat, Robert Katz

Robert Katz Publications

The electrons of an atom occupy certain energy levels when the atom is far from other atoms. When a large number of atoms are assembled to form a conducting metallic solid, the energy levels of the valence electrons are displaced in position to form a conduction band, as discussed in Section 28-4. The valence electrons occupy energy levels within the conduction band and are relatively free to drift from atom to atom within the metal. In accordance with a fundamental physical principle, known as the Pauli exclusion principle, only 1 electron may occupy a particular energy level. The conduction electrons …

Physics, Chapter 30: Magnetic Fields Of Currents, Henry Semat, Robert Katz

Robert Katz Publications

The first evidence for the existence of a magnetic field around an electric current was observed in 1820 by Hans Christian Oersted (1777-1851). He found that a wire carrying current caused a freely pivoted compass needle in its vicinity to be deflected. If the current in a long straight wire is directed from C to D, as shown in Figure 30-1, a compass needle below it, whose initial orientation is shown in dotted lines, will have its north pole deflected to the left and its south pole deflected to the right. If the current in the wire is reversed and …

Physics, Appendix B, Henry Semat, Robert Katz

Robert Katz Publications

Appendix B

Physics, Chapter 16: Kinetic Theory Of Gases, Henry Semat, Robert Katz

Robert Katz Publications

The behavior of a gas under various conditions of temperature and pressure has already been studied in some detail. When the pressure of a constant mass of gas is not too great, say less than about 2 atm, we find that a gas obeys the following relationships to be discussed.

Physics, Chapter 33: Magnetic Properties Of Matter, Henry Semat, Robert Katz

Robert Katz Publications

Matter is composed of atoms consisting of positively charged nuclei and negative electrons. These electrons occur in shells, and the periodic nature of chemical properties of atoms as the atomic weight increases is a reflection of the fact that the chemical behavior of an atom depends largely upon the number of electrons in the outermost shell. In some parts of the periodic table (see Table 5 of Appendix A), electrons occupy places in an outer shell before an inner shell is completely filled; it is then observed that a number of different elements have very similar chemical properties. The same …

Physics, Chapter 36: Light And Its Measurement, Henry Semat, Robert Katz

Robert Katz Publications

The word light, as commonly used, refers to the radiant energy which produces a visual effect. It was first shown by Maxwell that light is an electromagnetic radiation, propagated with a speed whose value was numerically determined by the relationship between electric and magnetic units.

Physics, Chapter 28: Electrical Conduction In Liquids And Solids, Henry Semat, Robert Katz

Robert Katz Publications

We have seen that electrical conduction in solids is associated with the drift of free electrons in the solid, a process which will be examined in greater detail in Section 28-4. A similar mechanism may be used to account for the conduction of electricity in liquid metals. In other liquids electricity is conducted by the migration of positive and negative ions through the liquid.

Physics, Chapter 27: Direct-Current Circuits, Henry Semat, Robert Katz

Robert Katz Publications

When a charged particle traverses a closed path in an electrostatic field in space, the total work done on the particle is zero. The electric field is conservative. Associated with each point in the field, there is a fixed value of the electrical potential.

In a simple circuit consisting of a chemical cell and a resistor, as shown in Figure 27-1, we have seen that the current flows through the resistor from the positive terminal of the cell to the negative terminal of the cell. The positive terminal is at the higher potential, so that the current flows from the …

Physics, Chapter 5: Force And Motion, Henry Semat, Robert Katz

Robert Katz Publications

All of us have many times had the experience of setting a body in motion. If we analyze any of these experiences, we readily recall that in each case some force was required to start the object moving. In throwing a ball, moving a piece of furniture, or pulling a sled, the force needed to start the object moving is supplied by one's muscular effort as a push or a pull. In more complex cases, such as setting a car or an airplane in motion, the analysis, although more complicated, will also show that a force is required to start …

Physics, Chapter 34: Alternating Currents, Henry Semat, Robert Katz

Robert Katz Publications

If the current in a resistor varies sinusoidally, as shown in Figure 34-1, the potential difference across the terminals of the resistor will also vary sinusoidally in the same manner, in phase with the current, in accordance with Ohm's law. Writing i for the instantaneous value of the current and v for the instantaneous value of the potential difference, we have v = iR.

Physics, Chapter 26: The Electric Current, Henry Semat, Robert Katz

Robert Katz Publications

Electricity is the basis of our present highly technical civilization. It is the means whereby energy from various sources is delivered to the consumer in a form suitable for its conversion into the many kinds of energy demanded by him. It is through the intermediary of the electric circuit that energy is transmitted electrically from the primary source, no matter where it is situated, to the ultimate consumer wherever he desires it. A complete electric circuit contains some form of electric generator, which is essentially a device for converting other forms of energy to electrical energy, a set of conductors …

Oil In Nebraska

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

The Czechs Of Butler County, 1870–1940, Clarence John Kubicek

Department of History: Dissertations, Theses, and Student Research

The Czechs and their descendents make up one of the large groups that settled and developed the State of Nebraska. While every county of Nebraska may have a few Czechs within its confines, the largest numbers are found in Douglas, Saline, Colfax, Saunders, and Butler Counties.

It is the purpose of this thesis to deal with the Czechs of Butler County. A racial group, Slavic in origination and since the first World War, properly called the "Czechs." The term "Czech" is to be applied, not only to those whose ancestry goes back to Bohemia, but also to those who originally …

Learning To Be A Homemaker : Extension Circular 11-11-2

Nebraska 4-H Clubs: Historical Materials and Publications

This 4-H circular contains the project for learning to be a homemaker. It includes information on setting the table, serving the meal, doing the dishes, ironing, and planning family fun.

Physics, Contents, Henry Semat, Robert Katz

Robert Katz Publications

Table of contents

Physics, Chapter 13: Properties Of Matter, Henry Semat, Robert Katz

Robert Katz Publications

When a system is subjected to external forces, it generally undergoes a change in size or shape or both. We have thus far touched very lightly on such changes; for example, we have considered the change in length of an elastic spring and the change in volume of a gas when such systems were subjected to varying pressures. The changes produced in a system by the action of external forces depend upon the physical properties of the material of which the system is composed. A study of the properties of matter leads to information which is of practical value to …

Physics, Chapter 4: Statics Of A Rigid Body, Henry Semat, Robert Katz

Robert Katz Publications

In the preceding chapter we observed that a particle would remain in equilibrium, in a state of rest, or in a state of uniform motion in a straight line when the resultant of all the forces acting on it was equal to zero. This condition for equilibrium was extended to larger bodies under either of two possible conditions: If the forces acting on the body were concurrent, that is, if they were directed toward a single point, the body could be treated as if it were a particle; or if the body moved with uniform translational motion in which every …

Physics, Chapter 3: The Equilibrium Of A Particle, Henry Semat, Robert Katz

Robert Katz Publications

A particle which remains at rest or in uniform motion with respect to its frame of reference is said to be in equilibrium in that frame. Centuries ago it was recognized that the state of rest was a natural state of things, for it was observed that objects set in motion on the surface of the earth tended to come to rest. The maintenance of any horizontal motion on earth was thought to require the continued exercise of a force, hence to be a violent motion, while vertical motion like that of a falling body was thought to be natural …

Physics, Chapter 2: Motion Of A Particle (Kinematics), Henry Semat, Robert Katz

Robert Katz Publications

Normally, when we say an object is at rest, we mean that it is at rest with respect to the surface of the earth; when we say a car is moving at a speed of 40 mi/hr, we imply that the motion is taking place at this speed relative to the road. A boat sailing on the river moves with respect to the river's banks, but it also moves with respect to the flowing water in the river. The lift on the wings of an airplane is generated by the motion of the airplane through the air, but it is …

Physics, Chapter 29: The Magnetic Field, Henry Semat, Robert Katz

Robert Katz Publications

Natural magnets, called lodestones, have been known since ancient times. The lodestone, a magnetic oxide of iron called magnetite (Fe₃O₄), was mentioned by Thales of Miletus. By the eleventh century the magnetic compass was known to the Chinese, and in the twelfth century references to the compass were made in Western Europe. The lodestone is capable of attracting pieces of iron and of imparting permanent magnetism to other pieces of iron so that these too could attract iron filings. If an iron bar is magnetized, as the result of being near a piece of lodestone, and …

Physics, Chapter 21: Vibrations And Sound, Henry Semat, Robert Katz

Robert Katz Publications

There are two aspects of sound: one is the physical aspect which involves the physics of the production, propagation, reception, and detection of sound; the other, which is the sensation of sound as perceived by the individual, depends upon physiological and psychological effects. It is not desirable to separate the two aspects of sound completely, but the main emphasis in this book must necessarily be on the physical aspect. In this chapter we shall consider mostly musical sounds. A vocabulary has been developed to describe the sensation experienced when a musical sound is heard. Such terms as the pitch of …

Physics, Chapter 37: Reflection And Refraction, Henry Semat, Robert Katz

Robert Katz Publications

In the passage of a beam of light through a medium, some of the radiant energy is absorbed and is transformed into internal energy, while some of it is scattered in all directions. The oscillating electric field associated with the light wave sets some of the electrons of the medium into oscillation, thus giving up some of its energy, and these oscillating electrons subsequently reradiate energy as scattered electromagnetic radiation. Scattering therefore takes place only in the presence of matter. The color of the sky is due to the small amount of scattering of sunlight by the molecules of the …

Physics, Chapter 32: Electromagnetic Induction, Henry Semat, Robert Katz

Robert Katz Publications

When a wire moves through a uniform magnetic field of induction B, in a direction at right angles to the field and to the wire itself, the electric charges within the conductor experience forces due to their motion through this magnetic field. The positive charges are held in place in the conductor by the action of interatomic forces, but the free electrons, usually one or two per atom, are caused to drift to one side of the conductor, thus setting up an electric field E within the conductor which opposes the further drift of electrons. The magnitude of this …

Physics, Chapter 31: Forces On Moving Charges And Currents, Henry Semat, Robert Katz

Robert Katz Publications

Ampere was the first to show that wires carrying current experienced forces when placed in magnetic fields. Later it was shown that charged particles moving in magnetic fields also experience forces. Common applications of these phenomena are the electric motor, the galvanometer, and the cathoderay tube. Since a moving electric charge is equivalent to a current, we shall first consider the force acting on a charge q moving with velocity v in a magnetic field of induction B. Experiment shows that the force F acting on the charge q is at right angles to the directions of both v and …

Ec58-1413 Keeping Hens On Slat Floors, John Skinner, John Adams

University of Nebraska-Lincoln Extension: Historical Materials

Extension Circular 58-1413: This provides information about keeping hens on slat floors.

Ec58-413 Fabrics : Buying Sewing Laundering

University of Nebraska-Lincoln Extension: Historical Materials

Extension Circular 58-413 provides a reference of fabrics, plus tips for buying, sewing, and laundering.

Ec58-706 Residue Management Of Corn, Cliff Ashburn

University of Nebraska-Lincoln Extension: Historical Materials

Extension Circular 58-706: This is about residue management of corn on sandy irrigated soils in the North Platte River Valley.

Ec 58-1590 Control Of Insects Of Farm Stored Grain, Robert E. Roselle

University of Nebraska-Lincoln Extension: Historical Materials

Extension Circular 58-1590: This is about the control of insects of farm stored grain. It includes how to prevent stored grain insects, grain protectants, has pictures of the grain insects, fumigation, and spray surfaces.

4-H Club Organization: Extension Circular 0-01-2

Nebraska 4-H Clubs: Historical Materials and Publications

Gives an overview of the 4-h club including purpose, mission, description of clubs and requirements.