Incidence[ edit ] After the Kinsey Reports came out in the early s, findings suggested that historically and cross-culturally, extramarital sex has been a matter of regulation more than sex before marriage. For example, one study conducted by the University of Washington, Seattle found slightly, or significantly higher rates of infidelity for populations under 35, or older than Rates of infidelity among women are thought to increase with age. In one study by Blow, rates were higher in more recent marriages, compared with previous generations. According to this theory, when people live within environments that are demanding and stressful, the need for bi-parental care is greater for increasing the survival of offspring. Correspondingly, monogamy and commitment are more commonplace.
Dating as far back as 2. Homo habilis, an ancestor of Homo sapiens, manufactured Oldowan tools. First discovered at Olduvai Gorge in Tanzania, Oldowan artifacts have been recovered from several localities in eastern, central, and southern Africa, the oldest of which is a site at Gona, Ethiopia. Oldowan technology is typified by what are known as “choppers.
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If your number is higher, but less than the number for the next year, then your item had it’s design registered during that year. In July the numbering sequence changed as indicated on the chart. The last number issued in July was and began again In August starting with number To give an example using the number above the chart, Rd means: Design of your item was registered during The Public Record office and the British Government tend to enforce these marks and registration numbers.
Companies located outside the UK who have reproduced items, and tried to use a facsimile of the marks or numbering system have been sued, and have had sanctions imposed against them. This tends to protect the use of these marks, and in general restricts them to use on pieces made in the UK.
The author’s entire North Carolina Paleo collection assembled over a year span. The earliest prehistoric human occupation in North Carolina dates to the Paleo-Indian period, which is thought to have begun around 10, BC. The edges on both sides near the base were dulled, so as to prevent them from cutting through the bindings that attached the point to the spear shaft.
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Some archaeologists use the lowercase letters bp, bc and ad as terminology for uncalibrated dates for these eras. Beginning in , metrologists established as the origin year for the BP scale for use with radiocarbon dating , using a based reference sample of oxalic acid. According to scientist A. The problem was tackled by the international radiocarbon community in the late s, in cooperation with the U.
National Bureau of Standards. This value is defined as “modern carbon” referenced to AD
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Over the last 40 years, there has been a discernible increase in the number of scholars who have focused their research on early industrial organizations, a field of study that has come to be known as Archaeotechnology. Archaeologists have conducted fieldwork geared to the study of ancient technologies in a cultural context and have drawn on the laboratory analyses developed by materials scientists as one portion of their interpretive program.
Corroded iron from the Java Sea Wreck. Chinese Warring States arrowhead dating to about — B. A wrought-iron Roman cleaver. Large spear from Burkino Faso, Africa.
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Segui i suggerimenti del progetto di riferimento. Fisici dell’Istituto di fisica atomica e molecolare dell’olandese FOM hanno studiato i processi di collasso dei condensati e hanno osservato che la condensazione di Bose-Einstein ha inizialmente una coerenza locale e solo in seguito la coerenza si estende su tutto il condensato. Il buco nero acustico dovrebbe esplodere in un impulso di fononi, analogamente ai buchi neri tradizionali che, secondo la teoria di Hawking , dovrebbero evaporare tramite la radiazione di Hawking.
Alla Princeton University si ipotizza che la materia oscura possa esser composta da condensati. Nel il gruppo INFM del LENS di Firenze ha prodotto il primo condensato di potassio tramite una tecnica innovativa di contatto termico con un campione di atomi di rubidio in una trappola magnetica. Nel un gruppo di fisici tedeschi ha proposto un metodo per indurre un gas di bosoni ultrafreddi a comportarsi da fermioni e a non condensare.
Nel giugno un gruppo del NIST ha verificato l’ effetto Hall quantistico di spin in un condensato di atomi di Rubidio creando un prototipo di transistor spintronico .
Numerical Recipes Home Page We are numerical. We are one of the oldest continuously operating sites on the Web, with the historic former domain nr. Today, that number is about , , In partnership with Cambridge University Press, we develop the Numerical Recipes series of books on scientific computing and related software products.
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Home History Glossary Publishers Artists Techniques Topicals Warfare Blog Contact: Guide to Publisher’s Initials: This guide is meant to help in the identification of postcards publishers and printers when no full name appears on the some publishers used initials exclusively to identify themselves, others alternated between their full name or logo without any consistency.
With time, it became apparent that this classification scheme was much too simple. A fourth category, known as spontaneous fission, also had to be added to describe the process by which certain radioactive nuclides decompose into fragments of different weight. Alpha decay is usually restricted to the heavier elements in the periodic table.
Only a handful of nuclides with atomic numbers less than 83 emit an -particle. The product of -decay is easy to predict if we assume that both mass and charge are conserved in nuclear reactions. Alpha decay of the U “parent” nuclide, for example, produces Th as the “daughter” nuclide. There are three different modes of beta decay: When this happens, the charge on the nucleus increases by one. Once again the sum of the mass numbers of the products is equal to the mass number of the parent nuclide and the sum of the charge on the products is equal to the charge on the parent nuclide.
Nuclei can also decay by capturing one of the electrons that surround the nucleus. Electron capture leads to a decrease of one in the charge on the nucleus.
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Recent reports are easier to find, but notice how these stretch back to the s. And these are just the cases we heard about through the media. How many more complaints were quietly hidden by universities? Recent stories about sexual harassment, sexual assault, sexual misconduct, stalking, violations of dating policies, violations of campus pornography policies, and similar violations in academia are NOT A FLUKE! I decided to organize these by discipline and to include both faculty and administrators.
I did, however, include Athletic Directors and people in similar administrative positions. Note that I left off of the list any cases involving accusations alone without investigation, resignation, admission, administrative action, legal activity, etc. Specifically, these are cases involving faculty and administrators engaging in sexual harassment, sexual assault, sexual misconduct, stalking, violations of dating policies, violations of campus pornography policies, and similar violations, and where:
Intermittierendes Fasten (lat. intermittere ‚unterbrechen‘, ‚aussetzen‘) oder Intervallfasten ist die Bezeichnung für eine Ernährungsform, bei der ständig, in einem bestimmten Rhythmus, zwischen Zeiten der normalen Nahrungsaufnahme und des Fastens gewechselt wird. In verschiedenen Tiermodellen führt das intermittierende Fasten bei den so ernährten Tieren – im Vergleich zu Tieren.
Legacy and Legacy 2 Legacy Heritage Intrigue Valor current The inlaid nib is a distinctive Sheaffer design; no other manufacturer has used it in the same way or on nearly as many pens. Sheaffer Today In , Sheaffer was acquited by Bic yes, that Bic, the maker of disposable ballpoints. Bic began moving operations overseas. In , the historic plant in Fort Madison was finally shut down it was originally scheduled for closure in , but a skeleton crew remained for the next couple of years; rumor has it that there were difficulties in outsourcing production of the inlaid nibs for the Valor , and with it the last of the big pen companies ceased to be American.
We expect that Bic will keep the Sheaffer name around for luxury pens, and hope that Sheaffer keeps the same standards of quality and innovation that have distinguished it in the past. Sheaffer pens are extremely common and can be found everywhere. A quick glance at eBay and other online auction sites often shows more Sheaffer pens available than all the other major brand names put together. Doing a search is a bit trickier as nobody can actually spell Sheaffer correctly Scheffer, Schaefer, Shaeffer, etc.
This is made all the more puzzling by the fact that Sheaffer is usually printed right on the pen itself. However, the extremely wide availability of Sheaffer pens makes most of them far less collectible. The most collectible pens are the s vintage Balance especially colors that are harder to find in good condition, like Jade or Pearl or the notoriously rare Blue and Black , the s PFM Pen For Men , and their very early and limited production models.
Within ten years he had enlarged the factory three times, built a china works, taken on the largest and most gifted group of artists in the Potteries, and developed for Doulton a reputation for craftsmanship and artistry still identified with Royal Doulton today. There follows a selection of the backstamps most commonly used on Doulton Burslem wares, and some further hints on dating. The information is taken by permission from “The Doulton Burslem Wares” by Desmond Eyles, a compulsory work of reference for any collector of Doulton wares see back page.
The reference numbers for the Doulton Burslem marks have been prefixed by the letter ‘B’ to distinguish them from those also numbered 1 and up in the list of Lambeth marks given in The Doulton Lambeth Wares. Several of these were adopted after by Doulton and remained in use for about twenty years. The following are two typical examples found on the patterns Rouen and Kew.
The Peterson brand is issued from the association of the brothers Friedrich and Heinrich Kapp with Charles Dublin tobacco shop first named “Kapp Brothers” () became the “Kapp & Peterson” Company. Tom Palmer bought the Peterson business in the early s.
Ultrasonic Fetal Measurement Standards If we assume a fetus is growing normally, biometric measurements are determined by gestational age, and we can estimate the gestational age and thus the due date. Conditions which alter fetal growth will make the estimates less reliable. Although many embryonic and fetal structures can be measured, only a few measurements are easy and repeatable enough for widespread use. The most common are: The first element to be measurable is the gestation sac of the early pregnancy.
The gestational sac is measured in three dimensions, and the average, the Mean Sac Diameter MSD used for estimating gestational age. The length of the embryo on the longest axis excluding the yolk sac constitutes the crown-rump length. The transverse width of the head at it’s widest. We measure from the the leading edge to leading edge of the bones, because this leading interface is most distinct.
Since the head is oval, the error induced by small errors in positioning is small, making for a repeatable, robust measure. The BPD best used after 12 weeks. The femur length is a repeatable measurement with accuracy similar to the BPD. It is effected by skeletal dysplasias, but since these are rare, it is a reliable measurement which confirms measurements of the head.
It is best measured after 14 weeks.