Bound to Ride that Northern Railroad: Representations of Blackness in O Brother, Where Art Thou

Bound to Ride that Northern Railroad: Representations of Blackness in O Brother, Where Art Thou by Eric Goldfische

Venus wind-altitude radar study

A study was made of a wind/altitude radar for a Venus probe. The baseline configuration was taken to be the SKD-2100 Doppler radar modified to accommodate the altimeter portion of the APN-187 and a single beam antenna. Using current models of the Venus environment, engineering studies were made to define design requirements and to estimate the operational and physical characteristics of the conceptual design. The results of the study are that: (1) the radar instrument should have an altitude limit of at least 34 km for velocity and at least 17.5 km for altitude measurement, (2) vertical accuracy should be better than + or - 0.9 percent and horizontal velocity accuracy should be better than + or - 3 percent over the operating altitude range, and (3) altimeter accuracy should be within + or - 3 percent up to about 2.5 km and should improve over the remainder of the altimeter operating range. The radar is expected to require between 48.5 and 69.3 watts of power and to weigh between 3.86 and 5.21 kg (8.5 and 11.5 lb). In each case, if power could be supplied directly from the probe batteries the lower figures would apply; the upper figures would apply if a power conditioner must be used

Persistent cloaca and caudal duplication in a monovular twin, a rare case report

© 2019 Introduction: A cloaca occurs when genitourinary tract and bowel converge into a common channel. We report a case of partial caudal duplication, persistent cloaca and vestigial appendage in a monovular female twin infant. Presentation of case: This is a monochorinonic-diamniotic twin born at 36 weeks with apgars of 9/9. She had a duplicated labia with two clitorises, and a partially formed accessory foot with 2 toes protruding from the right gluteal region. There was anal atresia and a punctate urethral opening in the right genitalia through which she voided spontaneously. X-ray of the accessory foot had rudimentary metatarsals and phalanges. There was left hydroureteronephrosis and a hydrocolpos causing severe mass effect. On the first day of life, she had exploratory laparotomy with a diverting colostomy and mucus fistula and drainage of hydrocolpos. At 6 months of age, she had removal of the accessory foot with flap closure of the perineal defect and vesicostomy. At 15 months of age she had laparotomy for repair of cloaca, excision of presacral pelvic mass and the duplicated vulva. Discussion: Theories of etiology include failure of regression of Kovalevsky\u27s canal (a communication that connects the amniotic and yolk sac), an incomplete form of twinning through iatrogenic damage to the zona pellucida or a failed triplet formation from a single embryo. Conclusion: Caudal duplication with persistent cloaca and vestigial appendage is a rare and complex malformation. Having a unified surgical and medical team to preserve quality of life and to treat complications is of key importance

Physical properties of speckles

Speckles are no longer regarded merely as a noise element, but as a carrier of information to be used in different applications. This offers a powerful and simple tool for studying surface roughness, for measuring displacement and strain, and for deformation and vibration analysis