Chapter 1 Oceanography before, and after, the advent of satellites

Author(s):  
Walter Munk
Keyword(s):  
2021 ◽  
pp. 22-56
Author(s):  
Mira Balberg ◽  
Haim Weiss

Chapter 1 focuses on the aging body, and particularly on aspects of gender and sexuality of the aging body. Following a discussion of ancient medical theories regarding aging processes and their echoes in rabbinic texts, the chapter analyzes two rabbinic accounts regarding biblical figures whose bodies managed to defy the laws of aging. The first part of the chapter analyses the narrative of Abraham and Sarah’s return to their youth (BT Baba Metzi‘a 87a) and the vicissitudes through which their bodies went before and after the birth of Isaac, whereas the second part examines one story about King David’s sexuality in his old age (BT Sanhedrin 22a). The chapter argues that through the use of semi-mythical figures, the rabbis reveal both their desire to undo the processes of aging and their profound conviction that aging must ultimately be accepted.


Author(s):  
David McDowall ◽  
Richard McCleary ◽  
Bradley J. Bartos

Chapter 1 introduces Interrupted Time Series Analysis (ITSA) as a toolbox for researchers whose data consist of a long sequence of observations | say, N ≥15 observations | measured before and after a treatment or intervention. Sometimes the treatment or intervention is implemented by the researcher, other times it occurs naturally or by accident. The chapter also describes a family of impact types, characterized by their onset (abrupt or gradual) and duration (permanent or temporary); and the essential role of counterfactual controls in causal inference. The chapter concludes with an outline and summary of the book's subsequent chapters.


Author(s):  
Keith Ray ◽  
Julian Thomas

The archaeological evidence that has accumulated over the past five decades demonstrates that two very different situations existed successively in Britain in the centuries on either side of 4000 BCE. While this is in some ways an arbitrary date, it is nonetheless a convenient one, since there are very few indications that ‘Neolithic’ artefacts and structures existed in Britain for long before the turn of the fourth millennium. Up until 4000 BCE (or perhaps a century or two earlier), the mainland and islands were populated by people who were heavily dependent upon hunting and gathering; afterwards the population lived a way of life that to a greater or lesser extent relied on herding and cultivating. Further, whereas the technology of the hunting societies had been skilfully made but was highly portable, more durable artefacts and architecture now proliferated, creating a much denser world of crafted things. However, the available evidence can be cast in a number of different ways, with the material before and after the critical date being capable of sustaining either maximal or minimal interpretations. As a consequence, the ways in which the character and degree of change across the threshold can be understood are also multiple and varied. As we saw in Chapter 1, the archaeologists of the 1920s to 1960s emphasized the contrast between the Mesolithic and the Neolithic. Before the ‘transition’ between the two, Britain was home to a sparse population of hunter-foragers who followed game (including deer, wild pig, and wild cattle) and collected plants, nuts, and berries, and, for those near the sea, exploited marine resources. They had few, often simple artefacts, although it was acknowledged that significant skill was invested in some of them. They lived in informal campsites composed of rudimentary shelters while pursuing a transient way of life. Afterwards, in contrast, there were settled agriculturalists living in stable communities, in well-built houses, enjoying a mixed farming subsistence base. They were capable of building barrows and tombs for their dead, which may have demonstrated their incorporation into a widespread megalithic cult. The dichotomy between these two ways of life demanded that some fundamental change must have separated them, of whatever kind.


Author(s):  
J. Temple Black

Tool materials used in ultramicrotomy are glass, developed by Latta and Hartmann (1) and diamond, introduced by Fernandez-Moran (2). While diamonds produce more good sections per knife edge than glass, they are expensive; require careful mounting and handling; and are time consuming to clean before and after usage, purchase from vendors (3-6 months waiting time), and regrind. Glass offers an easily accessible, inexpensive material ($0.04 per knife) with very high compressive strength (3) that can be employed in microtomy of metals (4) as well as biological materials. When the orthogonal machining process is being studied, glass offers additional advantages. Sections of metal or plastic can be dried down on the rake face, coated with Au-Pd, and examined directly in the SEM with no additional handling (5). Figure 1 shows aluminum chips microtomed with a 75° glass knife at a cutting speed of 1 mm/sec with a depth of cut of 1000 Å lying on the rake face of the knife.


Author(s):  
R. F. Bils ◽  
W. F. Diller ◽  
F. Huth

Phosgene still plays an important role as a toxic substance in the chemical industry. Thiess (1968) recently reported observations on numerous cases of phosgene poisoning. A serious difficulty in the clinical handling of phosgene poisoning cases is a relatively long latent period, up to 12 hours, with no obvious signs of severity. At about 12 hours heavy lung edema appears suddenly, however changes can be seen in routine X-rays taken after only a few hours' exposure (Diller et al., 1969). This study was undertaken to correlate these early changes seen by the roengenologist with morphological alterations in the lungs seen in the'light and electron microscopes.Forty-two adult male and female Beagle dogs were selected for these exposure experiments. Treated animals were exposed to 94.5-107-5 ppm phosgene for 10 min. in a 15 m3 chamber. Roentgenograms were made of the thorax of each animal before and after exposure, up to 24 hrs.


Author(s):  
M. H. Wheeler ◽  
W. J. Tolmsoff ◽  
A. A. Bell

(+)-Scytalone [3,4-dihydro-3,6,8-trihydroxy-l-(2Hj-naphthalenone] and 1,8-di- hydroxynaphthalene (DHN) have been proposed as intermediates of melanin synthesis in the fungi Verticillium dahliae (1, 2, 3, 4) and Thielaviopsis basicola (4, 5). Scytalone is enzymatically dehydrated by V. dahliae to 1,3,8-trihydroxynaphthalene which is then reduced to (-)-vermelone [(-)-3,4- dihydro-3,8-dihydroxy-1(2H)-naphthalenone]. Vermelone is subsequently dehydrated to DHN which is enzymatically polymerized to melanin.Melanin formation in Curvularia sp., Alternaria sp., and Drechslera soro- kiniana was examined by light and electron-transmission microscopy. Wild-type isolates of each fungus were compared with albino mutants before and after treatment with 1 mM scytalone or 0.1 mM DHN in 50 mM potassium phosphate buffer, pH 7.0. Both chemicals were converted to dark pigments in the walls of hyphae and conidia of the albino mutants. The darkened cells were similar in appearance to corresponding cells of the wild types under the light microscope.


Author(s):  
T. Gulik-Krzywicki ◽  
M.J. Costello

Freeze-etching electron microscopy is currently one of the best methods for studying molecular organization of biological materials. Its application, however, is still limited by our imprecise knowledge about the perturbations of the original organization which may occur during quenching and fracturing of the samples and during the replication of fractured surfaces. Although it is well known that the preservation of the molecular organization of biological materials is critically dependent on the rate of freezing of the samples, little information is presently available concerning the nature and the extent of freezing-rate dependent perturbations of the original organizations. In order to obtain this information, we have developed a method based on the comparison of x-ray diffraction patterns of samples before and after freezing, prior to fracturing and replication.Our experimental set-up is shown in Fig. 1. The sample to be quenched is placed on its holder which is then mounted on a small metal holder (O) fixed on a glass capillary (p), whose position is controlled by a micromanipulator.


Author(s):  
R. M. Anderson

Aluminum-copper-silicon thin films have been considered as an interconnection metallurgy for integrated circuit applications. Various schemes have been proposed to incorporate small percent-ages of silicon into films that typically contain two to five percent copper. We undertook a study of the total effect of silicon on the aluminum copper film as revealed by transmission electron microscopy, scanning electron microscopy, x-ray diffraction and ion microprobe techniques as a function of the various deposition methods.X-ray investigations noted a change in solid solution concentration as a function of Si content before and after heat-treatment. The amount of solid solution in the Al increased with heat-treatment for films with ≥2% silicon and decreased for films <2% silicon.


Author(s):  
T. C. Tisone ◽  
S. Lau

In a study of the properties of a Ta-Au metallization system for thin film technology application, the interdiffusion between Ta(bcc)-Au, βTa-Au and Ta2M-Au films was studied. Considered here is a discussion of the use of the transmission electron microscope(TEM) in the identification of phases formed and characterization of the film microstructures before and after annealing.The films were deposited by sputtering onto silicon wafers with 5000 Å of thermally grown oxide. The film thicknesses were 2000 Å of Ta and 2000 Å of Au. Samples for TEM observation were prepared by ultrasonically cutting 3mm disks from the wafers. The disks were first chemically etched from the silicon side using a HNO3 :HF(19:5) solution followed by ion milling to perforation of the Au side.


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