Results 1 - 10 of 1923
Results 1 - 10 of 1923. Search took: 0.036 seconds
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[en] Research highlights: → Pyrodinium bahamense is a dinoflagellate confined to subtropical and tropical waters. → Two varieties (bahamense and compressum) cause blooms and produce paralytic toxins. → They were observed for the first time in the southern Baja California coasts. → Highest cell number observed of var. compressum suggests its first proliferation. → Future proliferations of Pyrodinium bahamense could represent a risk to public health. - Abstract: As part of a continuing toxic microalgae monitoring program, 22 phytoplankton samples were collected from July to November 2010 at several sampling stations along the southern coast of the Baja California Peninsula. For the first time, the toxic dinoflagellate Pyrodinium bahamense var. compressum was found along the southeastern and southwestsern coasts of the peninsula. P. bahamense var. bahamense was first observed off San Jose del Cabo, which is an extension of the range of this variety. Both varieties occur as solitary cells. P. bahamense var. compressum occurred at temperatures ranging between 24.5 oC and 31 oC, whereas var. P.bahamense occurred at 28.5 oC to 29 oC, indicating its tropical and subtropical nature. Occurrence of P. bahamense var. compressum along this coastline may be related to El Nino 2009-2010.
[en] The state of the art of earthquake prediction is summarized, the possible responses to such prediction are examined, and some needs in the present prediction program and in research related to use of this new technology are reviewed. Three basic aspects of earthquake prediction are discussed: location of the areas where large earthquakes are most likely to occur, observation within these areas of measurable changes (earthquake precursors) and determination of the area and time over which the earthquake will occur, and development of models of the earthquake source in order to interpret the precursors reliably. 6 figures
[en] This paper addresses the nexus between evaluation of energy-efficiency programs and incentive payments based on performance for program administrators in California. The paper describes the problems that arise when evaluators are asked to measure program performance by answering the counterfactual question-what would have happened in the absence of the program? Then the paper examines some ways of addressing these problems. Key conclusions are (1) program evaluation cannot precisely and accurately determine the counterfactual, there will always be substantial uncertainty, (2) given the current state of knowledge, the decision to tie all incentives to program outcomes is misguided, and (3) incentive programs should be regularly reviewed and revised so that they can be adapted to new conditions.
[en] Complete text of publication follows. Laser safety has been an active concern of laser users since the invention of the laser. Formal standards were developed in the early 1970's and still continue to be developed and refined. The goal of these standards is to give users guidance on the use of laser and consistent safety guidance and requirements for laser manufacturers. Laser safety in the typical research setting (government laboratory or university) is the greatest challenge to the laser user and laser safety officer. This is due to two factors. First, the very nature of research can put the user at risk; consider active manipulation of laser optics and beam paths, and user work with energized systems. Second, a laser safety culture that seems to accept laser injuries as part of the graduate student educational process. The fact is, laser safety at research settings, laboratories and universities still has long way to go. Major laser facilities have taken a more rigid and serious view of laser safety, its controls and procedures. Part of the rationale for this is that these facilities draw users from all around the world presenting the facility with a work force of users coming from a wide mix of laser safety cultures. Another factor is funding sources do not like bad publicity which can come from laser accidents and a poor safety record. The fact is that injuries, equipment damage and lost staff time slow down progress. Hence high profile/large laser projects need to adapt a higher safety regimen both from an engineering and administrative point of view. This presentation will discuss all these points and present examples. Acknowledgement. This work has been supported by the University of California, Director, Office of Science.
[en] California's state bills on nuclear power/waste and its Energy Commission are discussed. Criticism of the Commission is answered. Three levels of acceptability are outlined: engineering acceptance, marketing acceptance, and public acceptance. The prerequisites for a transition from public anxiety and suspicion to public confidence are set forth
[en] The first twelve months of the project focused on collecting data for characterization and modeling. In addition, data from Coalinga Field was analyzed to define the fractal structure present in the data set. The following sections of the report parallel the first four subtasks of the investigation were: (1) Collect and Load Property Data from Temblor Outcrops in California, (2) Collect and Load Property Data from Temblor Reservoir Sands, West Coalinga Field, California, (3) Collect and Load Property Data from Continuous Upper Cretaceous Outcrops in Utah, and (4) Define Fractal Structure in the Data Sets and Apply to Generating Property Representations
[en] This article describes how the Southern California Edison Company deals with revolutionary change as the state's electricity industry reinvents itself. The topics of the article include how competition has make things better for SCEC's employees, customers, and shareholders, and an outline of the principal features of the electric utility industry in California
[en] Complete text of publication follows. Results of a rock magnetic study of laminated sediments from the Alfonso Basin, Bay of La Paz are used to investigate sediment sources and depositional environment in the southern Gulf of California during the Holocene. AMS radiocarbon dating on benthic foram shells provides stratigraphic control, with age for the core bottom sediments of 7597-7831 cal. yr B.P. Magnetic signal is dominated by fine-grained titanomagnetites, derived from the silicic volcanic units surrounding the Bay of La Paz. Magnetic mineralogy is relatively homogenous as seen in bulk magnetic properties of low-field susceptibility, remanent intensity and coercivity. Magnetic hysteresis loops show strong variable paramagnetic components; after paramagnetic correction loops show saturation at low fields and high saturation magnetization values. Plots of hysteresis parameter ratios for domain state show that samples group in the pseudo-single domain field, with mixtures of single and multi-domain particles. Magnetic susceptibility logs show relatively high frequency dependence factors, particularly for the Middle Holocene, suggesting increased contribution of fine-grained superparamagnetic minerals related to eolian deposition. Magnetic susceptibility exhibits an apparent cyclicity of roughly 1200-1500 yr. Paramagnetic slope correction parameter shows higher values between 30 cm and 40 cm depth, with an apparent cyclic variation along the core. The well-preserved laminated sequence indicates predominant anoxic conditions in the basin floor. Depositional environment had a dominant supply of pluvial detrital sediments and eolian fine-grained dust composed of siliciclastic volcanically-derived material with less abundant biogenic input.
[en] Based on Gutenberg-Richter’s relation, Bath’s law, Omori’s law and Well’s relation of rupture scale, this paper forecasts the temporal decay, total number, possible area and greatest magnitude of strong aftershocks (greater than or equal to M6.0) of the MS8.0 Wenchuan earthquake by using the magnitude and statistical parameters of earthquakes in California area of USA. The number of strong aftershocks, the parameters of Gutenberg-Richter’s relation and the modified form of Omori’s law are validated based on the relocation data of aftershock sequence of the MS8.0 Wenchuan earthquake. Moreover, the spatio-temporal characteristics and wave energy release of the strong aftershocks (M≥6.0) are analyzed. The result shows that strong aftershocks may occur at the end of local drop and sharp drop on the wave energy release curve.