.Many of the most serious and complex problems facing the United States today result from our phenomenal tech­ nological achievements and. accelerating pace of urbaniza­ tion. The capacity of this nation to produce and consume goods has swelled dramatically, particularly in the two decades since the end of World War II. Within the same period, urban growth has compacted more than half of the to...

This paper investigates the partition of the configuration space induced b y basic contacts between polyhedra, using their combinatorial interpretation in terms of oriented matroids. It is shown that solving motion planning problems using this cellular decomposition can be analytically expressed in terms of invariants, without explicit use of artificial coordinate frames. One o f the main aims ...

Microscale assays are reported on interstitial fluid samples taken from solid unicen tric tumor transplants. Comparison was made of the protein content and enzymatic activity of normal mouse plasma and peritoneal fluid in the same strain of mice. The cell-free tumor fluid had a higher protein content, about 5 per cent, than the peritoneal fluid. The total “over-all― dipeptidase activity per...

As a result of much computat ion linguistic research in the 1970's, natural language (NL) processors have begun to rival more formal means of computer access in some instances. Unfortunately, very little is known, even by applied NL researchers themselves, about the true capabilities of existing systems. This is partly due to the fact that most l i terature, at least in journals such as this on...

tention as a promising drug candidate for anticoagulation. FXa, a serine protease in the blood coagulation cascade, is essential for the formation of thrombin. It plays an important role in the coagulation cascade at the convergent point of the intrinsic and the extrinsic pathway. FXa inhibitor is expected to be a novel antithrombotic with potential for the treatment and prevention of thromboem...

With the demonstration that the generalized Shwartzman reaction could be produced in pregnant rats by simply adding an oxidized lipid to an otherwise ordinary diet (1, 2), at tention is naturally directed to the material in the oxidized lipid tha t m ay be responsible for this unique pathologic change. Stamler's observations that the preliminary diet is low in tocopherol, and that supplements o...

Two controversial issues were investigated. One concerned the question of whether cen· trifugal fibers project to the human retina, and the other, the question of whether precortical fil· ters which differentially transmit relevant and irrelevant information during selective attention exist. The issues were addressed jointly by studying the effects of selective attention on evoked responses obt...

Prof. Arbini's at tention is flattering; his conclusions rather less so. The issues over which Arbini and I divide are many. Yet fundamentally, ! think, our differences may be traced to disagreement about the nature and promise of the theories produced by contemporary generative grammarians. It is here that I shall focus my attention. Some of the points at which Arbini aims his criticism are qu...

New app1ication.a th.at support cooperative work of users on. distributed computers often share perai9ten.t data atru.cturea that con,tain poinders. For th.eae app1ication.a. th,e un.derlyin,g system, often wea th,e “page aenler” arch,itecture. in which th,e persistent data are ah.ipped from th.e server on a page basis, ad clients cache th,e pagea for object-grain accesses. In this pagegrain. e...