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"Meisel, Paul"
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Static Testing of Seismic Restraint Devices
In support of the design process, manufacturers of seismic components typically perform tests to document the capacity of these devices. A test requirement or acceptance criterion is not clearly defined by the building codes. In line with their charge of ensuring code compliance, OSHPD (Office of Statewide Health Planning and Development, California) has developed the primary static anchorage evaluation \"standard\" in use today. However, because it links directly back to the California Building Code requirements, this standard is not necessarily appropriate to the requirements of other jurisdictions. ASHRAE and VISCMA (Vibration Isolation and Seismic Control Manufacturers Association) are currently working to develop new uniform static testing standards that address the wide range of applications and code requirements throughout the United States to bring a higher level of consistency to the industry. This paper reviews the history of seismic qualification, pros and cons of the current requirements, development of an appropriate industry standard for static testing of components, test methods, failure criteria, and a common format for the presentation of the data collected.
Journal Article
Good night, bat! Good morning, squirrel!
\"A lonely bat thinks he has found a perfect home until he discovers that it's already inhabited by a persnickety squirrel. Since each is asleep during the other's waking hours, the two begin exchanging notes. With these notes, Squirrel does her best to oust her unwelcome guest, but Bat misunderstands and thinks Squirrel is happy to have a new friend. This is a sweet opposites-attract friendship story that gently shows how to find common ground despite outward differences\"--Provided by publisher.
Book
I see a cat
A dog enjoys barking at a cat, a bee, and especially squirrels in this easy-to-read book.
Book
Static modeling of equipment acted on by seismic forces
While the national building codes do a good job of defining the seismic forces that mechanical systems must withstand, guidance in transferring these \"global\" loads into working forces that must be resisted at the restraint points is not well documented. The broad range of equipment and restraint types and structural interfaces makes these kinds of computations more complex. This paper is intended to offer insights into how different kinds of equipment behave as well as to suggest possible ways of computing the attachment forces that result from a given input load.
Journal Article
The Cool Crazy Crickets to the rescue!
The members of the Cool Crazy Crickets club decide to earn some money, but they have differences of opinion about how they should spend it.
Book
Extension of the nuclear mass surface for neutron-rich isotopes of argon through iron
Nuclear mass measurement has maintained an important position in the field of nuclear physics for a little over a century. Nuclear masses provide key evidence of the structural transformation of nuclei away from the valley of β-stability and are essential input for many simulations of extreme astrophysical environments. However, obtaining these masses is often a challenging endeavor due to the low production cross sections and short half-lives of the exotic nuclei which are of particular interest. To this end, the time-of-flight mass measurement technique has been developed to obtain the masses of several nuclei at once to precisions of 1 part in 105 with virtually no half-life limitation. This dissertation contains a description of the experiment, analysis, and results of the second implementation of the time-of-flight nuclear mass measurement technique at the National Superconducting Cyclotron Laboratory. 18 masses were obtained for neutron-rich isotopes of argon through iron, where the masses of 48Ar, 49Ar, 56Sc, 57Sc, 64Cr, 67Mn, and 69Fe were measured for the first time. These newly obtained masses were applied to outstanding problems in nuclear structure and nuclear astrophysics, resulting in significant scientific advances. The measurement results for 48Ar and 49Ar, which were found to have atomic mass excesses of −22.28(31) MeV and −17.8(1.1) MeV, respectively, provide strong evidence for the closed shell nature of neutron number N = 28 in argon. It follows that argon is therefore the lowest even-Z element exhibiting the N = 28 closed shell. The masses of 64Cr, 67 Mn, and 69Fe, which were found to have atomic mass excesses of −33.48(44) MeV, −34.09(62) MeV, and −39.35(60) MeV, respectively, show signs of nuclear deformation occurring around the N = 40 subshell. In addition, we found 64Cr is substantially less bound than predicted by global mass models that are commonly used in nuclear astrophysics simulations, resulting in a significant reduction in the predicted strength and depth of electron capture heating in the accreted neutron star crust due to the rather abundant A = 64 mass-chain. The reported value for the atomic mass excess of 56Sc, −24.85(59)(+0,−54) MeV, which contains an asymmetric systematic uncertainty due to potential isomeric contamination, results in a smaller than expected odd-even mass staggering in the A = 56 mass chain. Depending on the choice of theoretical models for electron capture transition strengths and energies, this could lead to strong Urca cooling in accreted neutron star crusts, due to the large amount of A = 56 material predicted to be present on the surface of accreted neutron stars.
Dissertation
On beyond a million : an amazing math journey
Explores counting by powers of ten all the way up to the largest numbers that exist.
Book
Numbers Count
\"The number symbols we use today are called the Hindu-Arabic numerals. They were invented by Hindu mathematicians in India and brought to other countries by Arab mathematicians.\" (Click) Read about the history of numbers.
Magazine Article