The Natural History of the Naked Goby \u3ci\u3eGobiosoma bosci\u3c/i\u3e (Perciformes: Gobiidae)

The purpose of this study was to contribute to the knowledge of re ­ production, growth, age, abundance, habitat preference, feeding habit and behavior of the naked goby, Gobiosoma Bosci. Monthly collections were made from January through December. 1974 in Deary Cove a apart of the Lynnhaven estuary, Virginia Beach, Virginia. All fish were measured and sexed in the field. Most were returned to the population, the remainder. were removed for food habit analyses, determination of fecundity, degree of gonadal maturity and aging. Habitat­ preference and abundance were determined in the field. Gobiosoma Bosci appears to be an annual species. spawning from April to about August in Deary Cove. Fecundity ranged from 688-1418 in fifteen specimens examined. Growth is more rapid in young fish. and males than in older fish and females. Population densities were found to be 8.0 fish/ m2 in an area with 25% suitable cover. The naked goby is a-sedentary facultative object dweller. The most important food item in the popula­tion investigated was polychaetas with the rest of its diet reflecting functional opportunism. The naked goby does not display territoriality except during spawning and nest guarding. A color anomaly is noted dorsal and caudal fins had black margins

Design techniques for high performance optical wireless front-ends

Wireless optical networks usually have demanding specifications in terms of bandwidth, dynamic range and sensitivity. The front-end is a critical element for the fulfillment of these demands. This paper discusses several design aspects of front-ends for optical wireless communications, covering techniques for achieving high gains, high input dynamic ranges, improving noise performance, and reducing electromagnetic interference (EMI). The paper further presents some experimental results of many of the techniques here described. The cumulative usage of those techniques significantly increases system performance, in terms of sensitivity, power and bandwidth even with low cost, CMOS technologies

Creating Options: Forming a Marshallese Community in Orange County, California

Founded by individuals pursuing higher education in the United States, the Marshallese community in Orange County today also represents family and national interests in access to business opportunities, employment, education, medical services, and other goals. This community has become an “official” Marshallese overseas community, site of the first Marshallese consulate in the mainland United States, and a link between overseas Marshallese and the home islands. Individuals and family units traverse networks of inter-linked households, highlighting processes of Islanders’ investments, including at least a short-term reversal of theoretically expected remittance flows. We explore the process of community formation, and compare rural and urban sites in the Marshall Islands to call attention to the community’s place in a system of geographically dispersed locations within the global political economy

Proposal for a single-molecule field-effect transistor for phonons

We propose a practical realization of a field-effect transistor for phonons. Our device is based on a single ionic polymeric molecule and it gives modulations as large as -25% in the thermal conductance for feasible temperatures and electric field magnitudes. Such effect can be achieved by reversibly switching the acoustic torsion mode into an optical mode through the coupling of an applied electric field to the dipole moments of the monomers. This device can pave the way to the future development of phononics at the nanoscale or molecular scale

Visible light communication for advanced driver assistant systems

VIsible light communication for advanced Driver Assistant Systems (VIDAS) is an outdoor application using the visible spectrum of light emitting diodes (LED). A simple traffic light set up based on LED traffic lights for traffic information transmission has been analyzed in this paper. Various important design parameters have been optimized through intensive investigation based on gain variation over 100 m of transmission range. This process is expected to simplify the front-end receiver design and enhance the performance of the receiver which is one of the most critical elements in a visible light communication (VLC) transceiver, especially in outdoor applications. Our design results show receiver adaptability for different packet sizes and different distances.FCT project VIDAS – PDTC/EEA-TEL/75217/200

Study of Community College Support Services for Students Who Suffer from Mental Disorders

Occupational and Adult Educatio

A CMOS signal to noise measurement circuit for infrared sectored receivers

This paper describes a circuit able to measure Signal to Noise ratios developed for Infrared applications. The Signal to Noise ratio is of major importance in IR Sectored Receivers because it provides the basis of selection or combining of signals coming from different optical sectors. This circuit estimates the ratio of the average optical signal sensed in the photo-detector and the average noise power present in the same photo-detector, with a 50dB output dynamic range.Este artigo descreve um circuito capaz de medir a Relação Sinal Ruído em sistemas de comunicação por Infravermelhos. A relação Sinal Ruído desempenha um papel fundamental em Receptores Sectorizados por IR, pois é necessária para métodos de selecção ou combinação dos sinais vindos dos diferentes sectores ópticos. O circuito aqui descrito é capaz de estimar a razão entre a potência média do sinal adquirido pelo fotodetector e a potência de ruído presente no mesmo, apresentando uma gama dinâmica de 50dB

Biofilter Media Characterization Using Water Sorption Isotherms

Compost material has been used extensively as a gas‐phase biofilter media for contaminant gas treatment in recent years. One of the biggest challenges in the use of this type of material is adequate control of compost moisture content and understanding its effect on the biofiltration process. The present work provides a methodology for characterization of biofilter media under low moisture conditions. Results indicated that low levels of equilibrium moisture content (EMC) were obtained for high levels of equilibrium relative humidity (ERH), i.e., 99% ERH produced EMC of approximately 20% (dry basis) at 25° C. Most bacteria struggle to survive in environments with ERH levels lower than 95%. Compost material from the same source was sieved into four compost particle size (PS) ranges to evaluate its water sorption behavior: 4.76 mm \u3e PS1 \u3e 3.36 mm \u3e PS2 \u3e 2.38 mm \u3e PS3 \u3e 2.00 mm \u3e PS4 \u3e 1.68 mm. Observed data were tested against isotherm models for their goodness‐of‐fit. Seven isotherm models were compared: (1) Langmuir; (2) Freundlich; (3) Sips; (4) Brunauer, Emmett, and Teller (BET); (5) BET for n‐layers; (6) Guggenheim, Anderson, de Boer (GAB); and (7) Henderson. In comparison with the other models, the Henderson model provided the best fit, as determined by the best combination of regression coefficient standard errors (Δ) and coefficients of determination (r2) for all four particle size ranges tested (95% confidence interval, C.I., and prediction interval, P.I.). The Henderson model was then used to test for significant differences in isotherms by particle size ranges.The four tested particle size ranges were not significantly different from each other (p \u3c 0.05), indicating similar water sorption behavior. Data from all four particle size ranges were pooled and regressed, and the minimum required moisture to maintain ERH at or above 95% was 16.41% ± 2.68% (dry basis)