Amplifier for measuring low-level signals in the presence of high common mode voltage

A high common mode rejection differential amplifier wherein two serially arranged Darlington amplifier stages are employed and any common mode voltage is divided between them by a resistance network. The input to the first Darlington amplifier stage is coupled to a signal input resistor via an amplifier which isolates the input and presents a high impedance across this resistor. The output of the second Darlington stage is transposed in scale via an amplifier stage which has its input a biasing circuit which effects a finite biasing of the two Darlington amplifier stages

Why stop there? Mexican migration to the U.S. border region

The transformation of the U.S. border economy since the 1980s provides a fascinating backdrop to explore how migration to the U.S-side of the Mexican border has changed vis-a-vis migration to the U.S. interior. Some long-standing patterns of border migrants remained unchanged during this period while others underwent drastic changes. For example, border migrants are consistently more likely to be female, to have migrated within Mexico, and to lack migrant networks as compared with migrants to the U.S. interior. Meanwhile, the occupational profile of border migrants has changed drastically from being predominately agricultural work to being largely made up of service-sector and sales-related work. Border migration is more sensitive to Mexican and U.S. business cycles than migration to the U.S. interior throughout the period and, while the data suggest border migrant wages may have caught up to other migrants' wages by the early 2000s, multivariate analysis indicates that border migrants who are female and/or undocumented continue to earn far less than such migrants who work in the U.S. interior.Emigration and immigration

The Refiguration of Body and Soul: Time and Narrative in C.S. Lewis's Retelling of the Cupid and Psyche Myth

This paper presents a reading of C.S. Lewis’s Till We Have Faces: A Myth Retold in light of Mikhail Bakhtin and Paul Ricoeur’s analysis of time’s role in transformation. I will focus on the narrative dynamics Lewis achieves by incorporating the temporal into the fabric of his narrative. This approach to temporality contrasts markedly with his source material, Apuleius’ Metamorphoses or the Golden Ass, which ultimately appears to transcend time and therefore transformation by novel’s end. I finish my analysis by arguing that as Lewis moves from his protagonist, Orual's, initial retelling to embracing a more limited version of the myth, instead of the disruptive force it is for Apuleius, the temporal becomes a generative force, transforming and renewing Lewis’s narrative along the lines of Ricoeur’s paradigm of prefiguration, configuration, and refiguration

Dynamic stability of space vehicles. Volume 3 - Torsional vibration modes

Torsional model development and model calculations for cylindrical space vehicle systems and systems employing clustered tank