scholarly journals La Jolla Natural Radiocarbon Measurements III

Radiocarbon ◽  
1963 ◽  
Vol 5 ◽  
pp. 254-272 ◽  
Author(s):  
Carl L. Hubbs ◽  
George S. Bien ◽  
Hans E. Suess
Keyword(s):  
Age Determination ◽  
University Of California ◽  
List Type ◽  
Type Number ◽  
Background Count ◽  
Optimal Material ◽  
La Jolla ◽  
University Of Bern ◽  
The University

During 1962 the La Jolla Radiocarbon Laboratory continued to follow essentially the same technique as in previous years. Three counters were used: 1.The “Bern Counter,” an Oeschger-Houtermans instrument manufactured at the Physical Institute of the University of Bern; described in La Jolla I (p. 197).2.The “Brussels Counter,” another Oeschger-Houtermans instrument, manufactured in Brussels by Manufacture Belge de Campes et de Matériel Électronique, S. A.; characterized in La Jolla II (p. 204).3.The “400-cc La Jolla Counter,” recently constructed at the University of California, San Diego to facilitate the age determination of samples containing less than 1 g of carbon. Because the first model, now in use, was constructed of brass—not the optimal material—the background count is relatively high (ca. 5.0 counts/min). Advantages lie in its high stability. For samples that yield 0.5 L or more of acetylene, this counter can be used quite satisfactorily. Check runs, using the same sample in this counter and in the Bern and Brussels counters, agree closely.

An alert in the psycho-social-health intervention. A graphic testimony of a real case with autism spectrum disorder

2011 ◽  
Vol 26 (S2) ◽  
pp. 758-758
Author(s):  
J.A. García ◽  
A.S. Raya ◽  
E.S. del Arco
Keyword(s):  
Autism Spectrum ◽  
Real Case ◽  
List Type ◽  
Type Number ◽  
High Functioning ◽  
The Family ◽  
Pertinent Information ◽  
New Challenges ◽  
Professional Intervention

The graphic papers of Pablo, 14 years, diagnosed of autism of high functioning, serve as a sign of alert when facing what underlies after the specializing professional intervention.A few letters, a few drawings, and a few words that show the powerlessness, the suffering and the absence of contextual specific adequacy.In this work we study, from the analysis of a real case, some excellent aspects in the psychosociosanitary attention, such as:-The need for compilation of pertinent information-The need for elimination of prejudices-The need for respect to the family-The need for specialized formation-The need for search of a shared communicative code-The need for search of strategies of social interaction-The need for empathy-The need for search of contextual specific adequacy-The need for rigorous rules in the physical containment.-The need of a turned over of adapted information-The need to respect the psychoevolutive situation of the patient-The need to give priority to the person on the illness.A testimony that should serve as a warning for those institutions, administrations and professionals who are thinking of having put all the resources to its scope.A testimony that should serve to contribute information and new challenges to those other professionals who do not stop their determination of conceptual and/or clinical anxious research.

Heteroaromatic Construction: The Fukuyama Synthesis of Tryprostatin A

2013 ◽  
Author(s):  
Douglass F. Taber
Keyword(s):  
Organic Chemistry ◽  
University Of California ◽  
University Of Arkansas ◽  
Yale University ◽  
Au Catalyst ◽  
University Of Houston ◽  
Selective Substitution ◽  
Mcgill University ◽  
La Jolla ◽  
The University

Alessandro Palmieri of the University of Camerino developed (Synlett 2010, 2468) the condensation of a nitro acrylate 1 with a 1,3-dicarbonyl partner 2 to give the furan 3. Chaozhong Li of the Shanghai Institute of Organic Chemistry showed (Tetrahedron Lett. 2010, 51, 3678) that an alkenyl halide 4 could be cyclized to the furan 5. Ayhan S. Demir of Middle East Technical University established (Chem. Commun. 2010, 46, 8032) that a Au catalyst could catalyze the addition of an amine 7 to a cyanoester 6 to give the pyrrole 8 . Bruce A. Arndtsen of McGill University effected (Org. Lett. 2010, 12, 4916) the net three-component coupling of an imine 9, an acid chloride 10, and an alkyne 11 to deliver the pyrrole 12. Bernard Delpech of CNRS Gif-sur-Yvette prepared (Org. Lett. 2010, 12, 4760) the pyridine 15 by combining the diene 13 with the incipient carbocation 14. Max Malacria, Vincent Gandon, and Corinne Aubert of UPMC Paris optimized (Synlett 2010, 2314) the internal Co-mediated cyclization of a nitrile alkyne 5 to the tetrasubstituted pyridine 17. Yoshiaki Nakao of Kyoto University and Tamejiro Hiyama, now at Chuo University, effected (J. Am. Chem. Soc. 2010, 132, 13666) selective substitution of a preformed pyridine 18 at the C-4 position by coupling with an alkene 19. We showed (J. Org. Chem. 2010, 75, 5737) that the anion from deprotonation of a pyridine 21 could be added in a conjugate sense to 22 to give 23. Other particularly useful strategies for further substitution of preformed pyridines have been described by Olafs Daugulis of the University of Houston (Org. Lett. 2010, 12, 4277), by Phil S. Baran of Scripps/La Jolla (J. Am. Chem. Soc. 2010, 132, 13194), and by Robert G. Bergmann of the University of California, Berkeley, and Jonathan A. Ellman of Yale University (J. Org. Chem. 2010, 75, 7863). K. C. Majumdar of the University of Kalyani developed (Tetrahedron Lett. 2010, 51, 3807) the oxidative Pd-catalyzed cylization of 24 to the indole 25. Nan Zheng of the University of Arkansas showed (Org. Lett. 2010, 12, 3736) that Fe could be used to catalyze the rearrangement of the azirine 26 to the indole 27.

scholarly journals Photographic Observation of Stellar Occultations

1988 ◽  
Vol 98 ◽  
pp. 144-145
Author(s):  
A. Tomić ◽  
N. Čabrić ◽  
V. Čelebonović
Keyword(s):  
List Type ◽  
Type Number ◽  
The Moon ◽  
Photographic Observation ◽  
High Quality ◽  
Crucial Step ◽  
Stellar Occultations ◽  
On Line

Stellar occultations are usually observed visually, but this can also be done photographically. Our method has some advantages: –the obtained moments of contacts refer to the smoothed lunar limb,–the error in the determination of contacts is calculable,–the error may be less than in visual work,–the reduction of photographs is fast, due to the application of an “on-line” computer [1].In order to achieve all this, it is necessary to make a series of photographs of the Moon and the object being occulted before the first and after the last contact. This is a crucial step in our method, because the photographs must be of high quality. This demands two things: –the images of the occulted object and the Moon must be reliably recorded and–the illuminated limb of the Moon must give optimal darkening on the film.

The Separation of Principal Stresses in Photo-Elastic Analysis

1946 ◽  
Vol 50 (432) ◽  
pp. 974-985 ◽  
Author(s):  
E. K. Frankl
Keyword(s):  
Stress Pattern ◽  
Design Tool ◽  
Complete Analysis ◽  
List Type ◽  
Elastic Analysis ◽  
Type Number ◽  
Principal Stresses ◽  
Suitable Material ◽  
Polarised Light

The photo-elastic method can be used for either of two main purposes:a)As a qualitative design tool to obtain indications of possibly unsuspected sources of stress concentration.(b)As a means of obtaining a complete analysis of a two-dimensional stress problem, i.e., the determination of the separate magnitudes of the principal stresses at any point, as well as the direction of the principal planes relative to some axis of reference.All that is required for (a) is the stress pattern which becomes visible and can be photographed when a loaded model cut from a sheet of suitable material is placed in a field of circularly polarised light.

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