PRELIMINARY WORK ON THE ONTOGENIES OF TRILOBITES FROM THE WEEKS FORMATION (CAMBRIAN; UTAH)

2016 ◽  
Author(s):  
Rayleno Santana Oliveira ◽  
◽  
Thomas Hegna ◽  
Rudy Lerosey-Aubril
Keyword(s):  
Preliminary Work

The major pre-Mississippian unconformity in Rock Canyon, central Wasatch Range, Utah

2014 ◽  
Vol 1 ◽  
pp. 1-5
Author(s):  
David Clark ◽  
Drew Derenthal ◽  
Bart Kowallis ◽  
Scott Ritter
Keyword(s):  
Upper Devonian ◽  
Large Size ◽  
Preliminary Work ◽  
Mississippian Rocks

In central Utah, the major pre-Mississippian unconformity is fairly well understood at most of the localities where it is recognized. However, the unconformity is more enigmatic in Rock Canyon of the central Wasatch Range. At this locality, dolomitization of most pre-Mississippian rocks obscures stratigraphic identification of Devonian and older units. The absence of any identifiable angular relationship further complicates resolution. Because of this, both identification of the stratigraphic level of the unconformity and, consequently, its magnitude remain controversial. Large-size dolomite samples taken in Rock Canyon at closely spaced intervals for the 3.6-m directly below definite Upper Devonian rocks yield microfossils, including conodonts, in the uppermost 1.6-m of that interval that indicate no unconformity exists between the Cambrian Maxfield Limestone and the Upper Devonian-Lower Mississippian Fitchville Dolomite at the horizon previously identified as unconformable. Rather, an unknown thickness of dolomitized Upper Devonian Pinyon Peak Formation and probable older rock (possibly Bluebell Dolomite and Victoria Formation) occurs between the top of definite Maxfield and base of the Fitchville. The identification of the unconformity horizon remains unknown. Our preliminary work outlines a promising procedure for future understanding of the magnitude and stratigraphic level of the unconformity.

Development of Certified Reference Materials for Diarrhetic Shellfish Poisoning Toxins, Part 2: Shellfish Matrix Materials

2016 ◽  
Vol 99 (5) ◽  
pp. 1163-1172 ◽  
Author(s):  
Pearse McCarron ◽  
Kelley L Reeves ◽  
Sabrina D Giddings ◽  
Daniel G Beach ◽  
Michael A Quilliam
Keyword(s):  
Reference Materials ◽  
Matrix Effects ◽  
Certified Reference Materials ◽  
Standard Addition ◽  
Tissue Homogenate ◽  
Shellfish Poisoning ◽  
Diarrhetic Shellfish Poisoning ◽  
Preliminary Work ◽  
Seafood Industry ◽  
Human Illness

Abstract Okadaic acid (OA) and its analogs, dinophysistoxins-1 (DTX1) and -2 (DTX2) are lipophilic biotoxins produced by marine algae that can accumulate in shellfish and cause the human illness known as diarrhetic shellfish poisoning (DSP). Regulatory testing of shellfish is required to protect consumers and the seafood industry. Certified reference materials (CRMs) are essential for the development, validation, and quality control of analytical methods, and thus play an important role in toxin monitoring. This paper summarizes work on research and development of shellfish tissue reference materials for OA and DTXs. Preliminary work established the appropriate conditions for production of shellfish tissue CRMs for OA and DTXs. Source materials, including naturally incurred shellfish tissue and cultured algae, were screened for their DSP toxins. This preliminary work informed planning and production of a wet mussel (Mytilus edulis) tissue homogenate matrix CRM. The homogeneity and stability of the CRM were evaluated and found to be fit-for-purpose. Extraction and LC-tandem MS methods were developed to accurately certify the concentrations of OA, DTX1, and DTX2 using a combination of standard addition and matrix-matched calibration to compensate for matrix effects in electrospray ionization. The concentration of domoic acid was also certified. Uncertainties were assigned following standards and guidelines from the International Organization for Standardization. The presence of other toxins in the CRM was also assessed and information values are reported for OA and DTX acyl esters.

The Sputter Deposition of Metal Multilayers

1987 ◽  
Vol 103 ◽  
Author(s):  
R. E. Somekh ◽  
R. J. Highmore ◽  
K. Page ◽  
R. J. Home ◽  
Z. H. Barber
Keyword(s):  
Differential Scanning Calorimetry ◽  
Sputter Deposition ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Monotonic Increase ◽  
Preliminary Work ◽  
Sputtering Pressure

ABSTRACTWe describe the strategy that we are using to make precision metal multilayers. Differential scanning calorimetry has been used with the Ni/Zr system to study the abruptness of the interface as a function of the sputtering pressure. For 10nm period multilayers there is a monotonic increase in the width of the interface with increasing sputtering pressure. W/Si multilayers have been studied as a function of both the sputtering pressure and the relative thicknesses of tungsten and silicon. At reasonably low sputtering pressures a well textured (110) tungsten X-ray peak is seen which is compatible with the expected thickness of the tungsten layers.Finally, we report some preliminary work on sputtering from tungsten and silicon targets which are at different distances from the substrate so that the degrees of bombardment on the growing layers of the film can be independently varied.

Method for localisation of sound sources and aggregation to an acoustic centre

2021 ◽  
Vol 263 (6) ◽  
pp. 894-906
Author(s):  
Yannik Weber ◽  
Matthias Behrendt ◽  
Tobias Gohlke ◽  
Albert Albers
Keyword(s):  
Sound Source ◽  
Single Point ◽  
Construction Cost ◽  
Measurement Technology ◽  
Front Part ◽  
Sound Sources ◽  
Preliminary Work ◽  
Product Engineering ◽  
Driving Conditions

Preliminary work by the IPEK - Institute of Product Engineering at KIT has shown that the simulated pass-by measurement for exterior noise homologation of vehicles has relevant optimization potential: the measurement can be carried out in smaller halls and with a smaller measurement setup than required by the norm and thus with less construction cost and effort. A prerequisite for this however is the scaling of the entire setup. For the scaling in turn, the sound sources of the vehicle must be combined to a single point sound source - the acoustic centre. Previous approaches for conventional drives assume a static centre in the front part of the vehicle. For complex drive topologies, e.g. hybrid drives, and unsteady driving conditions, however, this assumption is not valid anymore. Therefore, with the help of an acoustic camera, a method for localizing the dominant sound sources of the vehicle and a software-based application for summarizing them to an acoustic centre were developed. The method is able to take into account stationary, unsteady and sudden events in the calculation of the acoustic centre, which is moved as a result. Using substitute sound sources and two vehicles, the method and the used measurement technology were examined and verified for their applicability.

Sources for the History of the Jews of Majorca

Traditio ◽  
1995 ◽  
Vol 50 ◽  
pp. 334-341
Author(s):  
J. N. Hillgarth
Keyword(s):  
Jewish Community ◽  
Middle Ages ◽  
Historical Background ◽  
Detailed History ◽  
Preliminary Work ◽  
History Of ◽  
The Subject

In my view it will not be possible to write the detailed history of the Jewish community in Majorca until a great deal more preliminary work has been done on the sources for that history. The following sketch of the subject is limited to the period before 1500, and, except for some references to conversos, to the time before 1391. It seems best to begin with a brief discussion of the context within which the Jewish community of Majorca emerged in the later Middle Ages and of the historical background which gave it its peculiar importance.

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