Gas turbine engine fuel control

A variable orifice system is described that is responsive to compressor inlet pressure and temperature, compressor discharge pressure and rotational speed of a gas-turbine engine. It is incorporated into a hydraulic circuit that includes a zero gradient pump driven at a speed proportional to the speed of the engine. The resulting system provides control of fuel rate for starting, steady running, acceleration and deceleration under varying altitudes and flight speeds

Magnetoresistance of a two-dimensional electron gas in a parallel magnetic field

The conductivity of a two-dimensional electron gas in a parallel magnetic field is calculated. We take into account the magnetic field induced spin-splitting, which changes the density of states, the Fermi momentum and the screening behavior of the electron gas. For impurity scattering we predict a positive magnetoresistance for low electron density and a negative magnetoresistance for high electron density. The theory is in qualitative agreement with recent experimental results found for Si inversion layers and Si quantum wells.Comment: 4 pages, figures included, PDF onl

Metallic behavior in Si/SiGe 2D electron systems

We calculate the temperature, density, and parallel magnetic field dependence of low temperature electronic resistivity in 2D high-mobility Si/SiGe quantum structures, assuming the conductivity limiting mechanism to be carrier scattering by screened random charged Coulombic impurity centers. We obtain comprehensive agreement with existing experimental transport data, compellingly establishing that the observed 2D metallic behavior in low-density Si/SiGe systems arises from the peculiar nature of 2D screening of long-range impurity disorder. In particular, our theory correctly predicts the experimentally observed metallic temperature dependence of 2D resistivity in the fully spin-polarized system

Analysis and application of ERTS-1 data for regional geological mapping

Combined visual and digital techniques of analysing ERTS-1 data for geologic information have been tried on selected areas in Pennsylvania. The major physiolographic and structural provinces show up well. Supervised mapping, following the imaged expression of known geologic features on ERTS band 5 enlargements (1:250,000) of parts of eastern Pennsylvania, delimited the Diabase Sills and the Precambrian rocks of the Reading Prong with remarkable accuracy. From unsupervised mapping, transgressive linear features are apparent in unexpected density, and exhibit strong control over river valley and stream channel directions. They are unaffected by bedrock type, age, or primary structural boundaries, which suggests they are either rejuvenated basement joint directions on different scales, or they are a recently impressed structure possibly associated with a drifting North American plate. With ground mapping and underflight data, 6 scales of linear features have been recognized

A Moral Rights Theory of Private Law

Private law—the law of torts, contracts, and property—is at an interpretive impasse. The two leading conceptual theories of private law—corrective justice and civil recourse theories—both suffer from significant weaknesses. Given these concerns, private law may even seem incoherent. The problem is not insurmountable, however. This Article offers a new way to understand private law. I will argue that private law is best understood as a means for individuals to exercise their moral enforcement rights. Moral enforcement rights exist when an individual may legitimately use coercion to force another individual to comply with his or her moral duties. Not all interpersonal relationships implicate moral enforcement rights. However, when moral enforcement rights do exist, the law typically provides a private right of action. Indeed, the private right of action fills an important need, given the backdrop of existing legal regulation. Individuals usually may not coerce a wrongdoer on their own, and thus require some other mechanism todo so. The private right of action can be seen as a substitute means of enforcement given that the state ordinarily prohibits self-help. Recognizing this basis of private law allows us to explain a variety of private law remedies from compensatory damages to injunctive relief. It also accounts for the characteristic structure of the private right of action. In this way, a moral rights-based theory offers an important advance over leading corrective justice accounts. At the same time, a moral rights-based theory also provides an appealing basis for the private right of action. As a result, it avoids the normative doubts that often beset civil recourse theories. Finally, this Article has important normative implications. A moral rights understanding helps us to assess whether private law should be reformed in those cases in which legal and moral practices overlap. In such cases, it is often thought that if legal principles diverge from moral principles, the legal principles should be changed. Interpreting the private right of action as a means to exercise moral enforcement rights suggests that core private lawdoctrines converge with conventional moral principles