Speedy motions of a body immersed in an infinitely extended medium

We study the motion of a classical point body of mass M, moving under the action of a constant force of intensity E and immersed in a Vlasov fluid of free particles, interacting with the body via a bounded short range potential Psi. We prove that if its initial velocity is large enough then the body escapes to infinity increasing its speed without any bound "runaway effect". Moreover, the body asymptotically reaches a uniformly accelerated motion with acceleration E/M. We then discuss at a heuristic level the case in which Psi(r) diverges at short distances like g r^{-a}, g,a>0, by showing that the runaway effect still occurs if a<2.Comment: 15 page

Pulmonary embolectomy in a patient with recent renal homotransplantation

A successful case of pulmonary embolectomy is described. Diagnosis was made when the patient developed cardiac arrest in the hospital ward. The embolus was removed with the aid of cardiopulmonary bypass. The principal clot was discovered in the right pulmonary artery, with an additional small fragment in the left main pulmonary artery. Several unique features of this case increased the problems of care during and after the embolectomy. The patient had received a renal homotransplant to the left iliac fossa from a patient of a different blood type 7 weeks earlier. The embolus was thought to have originated in the left leg distal to the renal vein anastomosis. Technical details of the cardiopulmonary bypass and the subsequent vena caval plication were planned with a view to protecting the function of the graft. The presence of the renal homograft may have contributed to the original formation of the peripheral thrombus. Finally, the postoperative care was complicated by the need to provide cytotoxic drug therapy for the continued protection of the homograft. This therapy, which weakens the immunologic response of the host, had to be modified when septic complications occurred during the postoperative period. Eventual recovery was possible with minimal loss of renal function. © 1964

An Error-Correcting Line Code for a HEP Rad-Hard Multi-GigaBit Optical Link

This paper presents a line encoding scheme designed for the GBT ASIC, a transceiver under development for a multigigabit optical link upgrade of the TTC system. A general overview of issues related to optical links placed in radiation environments is given, and the required properties of the line code discussed. A scheme that preserves the DC-balance of the line and allows forward error correction is proposed. It is implemented through the concatenation of scrambling, a Reed-Solomon error-correction scheme and the addition of an error-tolerant DC-balanced header. The properties of the code are verified for two different interleaving options, which achieve different error correction capability at different implementation costs. One of the two options was implemented in a fully digital ASIC fabricated in a 0.13 μm CMOS technology, and ASIC implementation details and test results are reported

RENAL HOMOGRAFTS IN PATIENTS WITH MAJOR DONOR-RECIPIENT BLOOD GROUP INCOMPATIBILITIES.

Between November 24, 1962, and May 15, 1963, 12 renal homografts were done at the University of Colorado Medical Center. In half of the cases, a kidney was provided by a donor of the same major blood type as the recipient. In the other half, the major blood groups of the donor and recipient patients were different. The present study is concerned with an analysis of the results in these comparative series, in order to determine what influence the presence or absence of major blood group compatibility had upon the early success rate

Use of Living Donors for Renal Homotransplantation

The procedure is described which is followed at the University of Colorado Medical Center for the selection and evaluation of living donors for renal homotransplantation. Priority is given to volunteers who have a close genetic relationship to the recipient. The aortogram is the single most useful test for determining which kidney to be used. If either organhas a single artery, it can be employed for homografting without fear of encountering anatomic difficulties at the time of its subsequent insertion into the recipient. Twenty-two left and 18 right kidneys have been excised. The donor operation has been a safe one. The only complications have been two pneumothoraces, one atelectasis, one transient peroneal nerve palsy, and two subcutaneous wound infections. Renal hyperplasia of the remaining kidney apparently occurs promptly since the creatinine clearance returns to or toward normal within a few weeks after operation. Interestingly, the same phenomenon is also observed in the homograft in those recipients who have a successful result. The steps in the donor operation are described for both right and left sides. Wide exposure, block removal of the specimen, and meticulous technique are required both to protect the donor from surgical accidents and to insure a homograft of high quality. Homograft cooling is provided eitherby total body hypothermia of the donor or by a method in which intra-arterial infusion of a chilled electrolyte solution isused. The relative future roles of living and cadaveric donors are discussed. The results with parental or sibling donations have been good enough to justify further employment of these sources. In cases in which a genetically unrelated donor must be used, a sounder policy may be to seek cadaveric organs, especially if the recipient falls in an older age group. © 1964 American Medical Association All rights reserved