WorldWideScience

Sample records for hughes flying boat

  1. Water Pressure Distribution on a Flying Boat Hull

    Science.gov (United States)

    Thompson, F L

    1931-01-01

    This is the third in a series of investigations of the water pressures on seaplane floats and hulls, and completes the present program. It consisted of determining the water pressures and accelerations on a Curtiss H-16 flying boat during landing and taxiing maneuvers in smooth and rough water.

  2. The fusion of the imagination and the material universe: Hugh Hood, Flying a red kite (1962

    Directory of Open Access Journals (Sweden)

    Aleksander Kustec

    1999-12-01

    Full Text Available In the first weeks of January 1957 Hugh (John Blagdon Hood moved to Hartford, Connecticut, U. S. A, where he became Professor at Saint Joseph College. At the time Hood did not know that he was going to become one of Canada's greatest stylists and contemporary short story writers. Between January 1957 and March 1962, when he was going through a final selection o short stories for his first book, Flying a Red Kite (FRK, Hugh Hood wrote thirty-eight short stories and two novels (God Rest You Merry and Hungry Generations. The numbers show that Hood was an extremely productive writer in that period. From the thirty-eight stories he chose eleven for FRK, fourteen of them were published in subsequent collections, in various journals and short story anthologies, while thirteen of them have not been published yet.

  3. Tank tests of a family of flying-boat hulls

    Science.gov (United States)

    Shoemaker, James M; Parkinson, John B

    1934-01-01

    This report presents towing tests made in the N.A.C.A. tank of a parent form and five variations of a flying-boat hull. The beams of two of the derived forms were made the same as that of the parent and the lengths changed by increasing and decreasing the spacing of stations. The lengths of the two others of the derived forms were made the same as that of the parent while the beams were changed by increasing and decreasing the spacing of buttocks, all other widths being changed in proportion. The remaining derived form has the same length and beam as the parent, but the lines of the forebody were altered to give a planing bottom with no longitudinal curvature forward of the step. The test data were analyzed to determine the minimum resistance and the angle at which it occurs for all speeds and loads. The results of this analysis are given in the form of non dimensional curves for each model. The effect of variation in over-all size, as indicated by a "complete" test on any given hull, is pointed out. The effect of changing length alone by the spacing of buttocks, as well as the effects of the changes in length-beam ratio and longitudinal curvature that result from these operations are discussed. The difficulties encountered in interpreting test results of systematic families derived by the method used are emphasized. Further studies are suggested in which changes in the variable under consideration would not be obscured by secondary changes in other important variables.

  4. Tank tests of a model of a flying-boat hull with a fluted bottom

    Science.gov (United States)

    Dawson, John R

    1935-01-01

    A 1/5-scale model of a flying-boat hull having flutes in the bottom both forward and aft of the step (NACA model 19) was tested to determine its water performance. The model was also tested after the successive removal of the flutes on the afterbody and forebody. The results from these tests are compared with those from tests of a model of the hull of the Navy PN-8 flying boat and it is concluded that the fluted-bottom model and its modifications are inferior to the model of the PN-8.

  5. Developing the Navy’s NC Flying Boats: Transforming Aeronautical Engineering for the First Transatlantic Flight

    Science.gov (United States)

    2011-12-01

    ft. Max Gross Weight 28,0001b Cruising Speed 84kts Range 1,278 nm Crew 6 Engines (4) 400 hp Liberty L-12 Figure 7. The NC flying boat. In...of the hull. The keel of the hull is built up from spruce while the bottom planking is laid up from two plies of cedar separated by a waterproofing...pilots could remain below decks and out of the weather if desired. The aircraft commander even had enough space to lie down on the planking that made up

  6. Hydrodynamic Characteristics of a Low-drag, Planing-tail Flying-boat Hull

    Science.gov (United States)

    Suydam, Henry B

    1948-01-01

    The hydrodynamic characteristics of a flying-boat incorporating a low-drag, planing-tail hull were determined from model tests made in Langley tank number 2 and compared with tests of the same flying boat incorporating a conventional-type hull. The planing-tail model, with which stable take-offs were possible for a large range of elevator positions at all center-of-gravity locations tested, had more take-off stability than the conventional model. No upper-limit porpoising was encountered by the planing-tail model. The maximum changes in rise during landings were lower for the planing-tail model than for the conventional model at most contact trims, an indication of improved landing stability for the planing-tail model. The hydrodynamic resistance of the planing-tail hull was lower than the conventional hull at all speeds, and the load-resistance ratio was higher for the planing-tail hull, being especially high at the hump. The static trim of the planing-tail hull was much higher than the conventional hull, but the variation of trim with speed during take-off was smaller.

  7. A General Tank Test of a Model of the Hull of the British Singapore IIC Flying Boat

    Science.gov (United States)

    Dawson, John R; Truscott, Starr

    1936-01-01

    A general test was made in the N.A.C.A. tank of a 1/12-size model of the hull of the British Singapore IIC flying boat loaned by the Director of Research, British Air Ministry. The results are given in charts and are compared with the results of tests of a model of an American flying-boat hull, the Sikorsky S-40. The Singapore hull has a greater hump resistance but a much lower high-speed resistance than the S-40.

  8. Tanks Test of a Model of the Hull of the Navy PB-1 Flying Boat - N.A.C.A. Model 52

    Science.gov (United States)

    Allison, John M

    1936-01-01

    A model of the hull of the Navy PB-1 flying boat was tested in the N.A.C.A. tank as part of a program intended to provide information regarding the water performance of hulls of flying boats of earlier design for which hydrodynamic data have heretofore been unavailable. Tests were made according to the general method over the range of practical loadings with the model both fixed in trim and free to trim. A free-to-trim test according to the specific method was also made for the design load and take-off speed corresponding to those of the full-scale flying boat. The resistance obtained from the fixed-trim test was found to be about the same as that of the model of the NC flying-boat hull, and greater at the hump but smaller at high speeds than that of a model of the Sikorsky S-40 flying-boat hull.

  9. The application of basic data on planing surfaces to the design of flying-boat hulls

    Science.gov (United States)

    Diehl, Walter S

    1940-01-01

    Basic lift data on planing surfaces have been analyzed and the data applied to the design of flying-boat hulls. It is shown that a balance between air and water forces requires that the beam of the planing area bear a relation to the wing area that is determined by the lift coefficient of the wing and by the angle of dead rise in the planing surface. It is also shown that the fore-and-aft extent of the required planing area depends on the angle of dead rise. Failure to provide sufficient length of planing area appears to be the main reason for the poor water performance sometimes obtained when a large angle of dead rise is used.

  10. A collection of the collapsed results of general tank tests of miscellaneous flying-boat-hull models

    Science.gov (United States)

    Locke, F W S , Jr

    1947-01-01

    Presented here are the summary charts of the collapsed results of general tank tests of about 100 flying boat hull models. These summary charts are intended to be used as an engineering tool to enable a flying boat designer to grasp more quickly the significance of various hull form parameters as they influence his particular airplane. The form in which the charts are prepared is discussed in some detail in order to make them clearer to the designer. This is a data report, and no attempt has been made to produce conclusions or correlations of the usual sort. However, some generalizations are put forward on the various methods in which summary charts may be used.

  11. Tank tests of two models of flying-boat hulls to determine the effect of ventilating the step

    Science.gov (United States)

    Dawson, John R

    1937-01-01

    The results of tests made in the N.A.C.A. tank on two models of flying-boat hulls to determine the effect of ventilating the step are given graphically. The step of N.A.C.A. model 11-C was ventilated in several different ways and it was found that the resistance of the normal form is not appreciably affected by artificial ventilation in any of the forms tried. Further tests made with the depth of the step of model 11-C reduced likewise show no appreciable effect on the resistance from ventilation of the step. Tests were made on a model of the hull of the Navy P3M-1 flying-boat hull both with and without ventilation of the step. It was found that the discontinuity which is obtained in the resistance curves of this model is eliminated by ventilating the step.

  12. Aerodynamic Characteristics of Three Deep-Stepped Planing-Tail Flying-Boat Hulls

    Science.gov (United States)

    Riebe, John M.; Naeseth, Rodger L.

    1947-01-01

    An investigation was made in the Langley 300 MPH 7- by 10-foot tunnel to determine the aerodynamic characteristics of three deep-stepped planing-tail flying-boat hulls differing only in the amount of step fairing. The hulls were derived by increasing the unfaired step depth of a planing-tail hull of a previous aerodynamic investigation to a depth about 92 percent of the hull beam. Tests were also made on a transverse-stepped hull with an extended afterbody for the purpose of comparison and in order to extend and verify the results of a previous investigation. The investigation indicated that the extended afterbody hull had a minimum drag coefficient about the same as a conventional hull, 0.0066, and an angle-of-attack range for minimum drag coefficient of 0.0057 which was 14 percent less than the transverse stepped hull with extended afterbody; the hulls with step fairing had up to 44 percent less minimum drag coefficient than the transverse-stepped hull, or slightly more drag than a streamlined body having approximately the same length and volume. Longitudinal and lateral instability varied little with step fairing and was about the same as a conventional hull.

  13. The Effect of Spray Strips on a Model of the P3M-1 Flying Boat Hull

    Science.gov (United States)

    Dawson, John R

    1933-01-01

    This note presents the results of a series of tests made in the N.A.C.A. tank on a one-sixth full-size model of the hull and side floats of the Navy P3M-1 flying boat for the purpose of finding a method of reducing the amount of spray thrown into the propellers of this craft when taking off and landing. The model was tested without spray strips and with five different spray-strip arrangements. The best arrangement was an improvement over the bare hull with no spray strips, but the improvement was not sufficient to be satisfactory with the propellers in the designed position.

  14. Hydrodynamic Tests in the N.A.C.A. Tank of a Model of the Hull of the Short Calcutta Flying Boat

    Science.gov (United States)

    Ward, Kenneth E

    1937-01-01

    The hydrodynamic characteristics of a model of the hull of the Short Calcutta (N.A.C.A. Model 47) are presented in non-dimensional form. This model represents one of a series of hulls of successful foreign and domestic flying boats the characteristics of which are being obtained under similar test conditions in the N.A.C.A. tank. The take-off distance and time for a flying boat having the hull of the Calcutta are compared at two values of the gross load with the corresponding distances and times for the same flying boat having hulls of two representative American types, the Sikorsky S-40 and the N.A.C.A. 11-A. This comparison indicates that for hulls of the widely different forms compared, the differences in take-off time and distance are negligible.

  15. Aerodynamic Characteristics of a Flying-Boat Hull Having a Length-Beam Ratio of 15, TED No. NACA 2206

    Science.gov (United States)

    Riebe, John M.; Naeseth, Rodger L.

    1951-01-01

    An investigation was made in the Langley 300 MPH 7- by 10-foot tunnel to determine the aerodynamic characteristics of a flying-boat hull of a length-beam ratio of 15 in the presence of a wing. The investigation was an extension of previous tests made on hulls of length-beam ratios of 6, 9, and 12; these hulls were designed to have approximately the same hydrodynamic performance with respect to spray and resistance characteristics. Comparison with the previous investigation at lower length-beam ratios indicated a reduction in minimum drag coefficients of 0.0006 (10 peroent)with fixed transition when the length-beam ratio was extended from 12 to 15. As with the hulls of lower length-beam ratio, the drag reduction with a length-beam ratio of 15 occurred throughout the range of angle of attack tested and the angle of attack for minimum drag was in the range from 2deg to 3deg. Increasing the length-beam ratio from 12 to 15 reduced the hull longitudinal instability by an mount corresponding to an aerodynamic-center shift of about 1/2 percent of the mean aerodynamic chord of the hypothetical flying boat. At an angle of attack of 2deg, the value of the variation of yawing-moment coefficient with angle of yaw for a length-beam ratio of 15 was 0.00144, which was 0.00007 larger than the value for a length-beam ratio of 12.

  16. Tank Tests of a Model of One Hull of the Savoia S-55-X Flying Boat N.A.C.A. Model 46

    Science.gov (United States)

    Allison, John M

    1938-01-01

    A model of one of the twin hulls of the Italian Savoia S-55-X flying boat (N.A.C.A. Model 46) was tested in the N.A.C.A. tank according to the general method. The data obtained from these tests cover a broad range of speeds, loads, and trims and are given in nondimensional form to facilitate their use in applying this form of hull to any other flying boat or comparing it's performance with the performance of any other hulls. The results show that the resistance characteristics at best trim of this model are excellent throughout the speed range. In order to compare the performance of the S-55-X hull with that of the 35, a pointed-step hull developed at the N.A.C.A. tank, the data are used in the computations of take-off example of a twin-hull, 23,500-pound flying boat. The calculations show that the S-55-X hull has better take-off performance.

  17. A general tank test of a model of the hull of the Pem-1 flying boat including a special working chart for the determination of hull performance

    Science.gov (United States)

    Dawson, John R

    1938-01-01

    The results of a general tank test of a 1/6 full-size model of the hull of the Pem-1 flying boat (N.A.C.A. model 18) are given in non-dimensional form. In addition to the usual curves, the results are presented in a new form that makes it possible to apply them more conveniently than in the forms previously used. The resistance was compared with that of N.A.C.A. models 11-C and 26(Sikorsky S-40) and was found to be generally less than the resistance of either.

  18. A New Method of Studying the Flow of the Water Along the Bottom of a Model of a Flying-boat Hull

    Science.gov (United States)

    Ward, Kenneth E

    1940-01-01

    A new method of studying the flow of the water along the bottom of a model of a flying-boat hull is described. In this method, the model is fitted with a transparent bottom and is divided down the center line by a bulkhead. The flow is observed and photographed through one-half of the model by means of the diffused illumination from a battery of lamps contained in the other half of the model. Photographs of the flow, particularly of the changes that occur when the step ventilates, are shown. The results of the present investigation indicate that the method has considerable promise, chiefly in connection with motion-picture studies.

  19. Hydrodynamic and Aerodynamic Tests of Models of Flying-boat Hulls Designed Flow Aerodynamic Drag - NACA Models 74, 74-A, and 75

    Science.gov (United States)

    Truscott, Starr; Parkinson, J B; Ebert, John W , Jr; Valentine, E Floyd

    1938-01-01

    The present tests illustrate how the aerodynamic drag of a flying boat hull may be reduced by following closely the form of a low drag aerodynamic body and the manner in which the extent of the aerodynamic refinement is limited by poorer hydrodynamic performance. This limit is not sharply defined but is first evidenced by an abnormal flow of water over certain parts of the form accompanied by a sharp increase in resistance. In the case of models 74-A and 75, the resistance (sticking) occurs only at certain combinations of speed, load, and trim and can be avoided by proper control of the trim at high water speeds. Model 75 has higher water resistance at very high speeds than does model 74-A. With constant speed propellers and high takeoff speeds, it appears that the form of model 75 would give slightly better takeoff performance. Model 74-A, however, has lower aerodynamic drag than does model 75 for the same volume of hull.

  20. Necrology: Hugh Carson Cutler

    Directory of Open Access Journals (Sweden)

    David L. Browman

    1999-05-01

    Full Text Available Hugh Carson Cutler, forner curator of Economic Botany at the Missouri Botanical Gardens, was one of the first generation paleoethnobotanists in this country. A pioneer in the field, and instrumental in getting American archaeologists to begin to employ flotation techniques for recovery of botanical remains. Cutler, the son of Manuel and Mary Cutler. was born September 8. 1912 in Milwaukee. Wisconsin. and died September 22, 1998 in Topeka, Kansas.

  1. The Many Worlds of Hugh Everett III

    CERN Document Server

    ,

    2011-01-01

    A review of Peter Byrne's biography of Hugh Everett III, "The Many Worlds of Hugh Everett III: Multiple Universes, Mutual Assured Destruction, and the Meltdown of a Nuclear Family", (Oxford University Press, 2010).

  2. A guide to Hughes' syndrome.

    Science.gov (United States)

    Sheehan, Tina Louise

    Hughes' syndrome, or antiphospholipid syndrome, is thought to be the cause of one in four strokes in people aged less than 40 years. It is an antiinflammatory autoimmune disorder in which the blood has a tendency to clot too quickly. It can affect any artery or vein in the body and the main symptoms are thrombosis, pregnancy loss and the presence of antibodies. If detected it can be treated effectively.

  3. New Russian Combat Small Boats

    Directory of Open Access Journals (Sweden)

    Aleksandr F. Mitrofanov

    2016-12-01

    Full Text Available The article presents an overview of small combat boats. The author provides a description and gives an analysis of the characteristics of the boat "Raptor", boat "BK-16", boat "Strizh-4-1 DSh", and assault boat "BK-10".

  4. Powering light boats

    Energy Technology Data Exchange (ETDEWEB)

    Affolter, J.-F.

    1999-07-01

    This short paper reports on a workshop held in Horw, Switzerland, on the application potential of low-temperature fuel cells. It looks at the increasing interest in small, electrically-driven boats in Europe and, in particular, at the option of powering them with fuel cells. A prototype implementation of a test boat is described. Powered by a 300-watt portable PEFC fuel cell constructed by the Paul Scherrer Institute (PSI) and the University of Applied Science in Solothurn, Switzerland, the boat is part of a project to study the technical feasibility of such drive systems for leisure craft and small boats. The paper addresses hydrogen security questions, energy-efficient drives and controllers, maintenance questions and discusses if a combination of fuel cells and photovoltaics would be viable. Also, the design of the boat's hull and the propellers that are used are looked at critically. The economic viability of fuel-cell powered boats is examined. The authors state that they are convinced that such fuel cell drives could be commercially interesting for larger passenger boats, too.

  5. The Blues Poetry of Langston Hughes

    Science.gov (United States)

    Waldron, Edward E.

    1971-01-01

    The author discusses the criteria of the blues as an American art form. He then shows how Langston Hughes captures the mood, the feeling, the rhythm and the impact of the blues in his poetry. (Author/LF)

  6. Recreational Boating Statistics 2012

    Data.gov (United States)

    Department of Homeland Security — Every year, the USCG compiles statistics on reported recreational boating accidents. These statistics are derived from accident reports that are filed by the owners...

  7. Bible for boats

    NARCIS (Netherlands)

    Wassink, J.

    2013-01-01

    After nearly forty years researching yacht hulls in the Delft towing tank, boat expert Dr. Lex Keuning has decided to share his life’s work with yacht builders and researchers. The Delft Systematic Yacht Hull Series is available online.

  8. Recreational Boating Statistics 2013

    Data.gov (United States)

    Department of Homeland Security — Every year, the USCG compiles statistics on reported recreational boating accidents. These statistics are derived from accident reports that are filed by the owners...

  9. Langston Hughes and his poem "Harlem"

    Institute of Scientific and Technical Information of China (English)

    郝红

    2005-01-01

    @@ James Langston Hughes was born February 1,1902, in Joplin, Missouri. His parents divorced when he was a small child, and his father moved to Mexico. He was raised by his Grandmother until he was thirteen, when he moved to Lincoln,Illinois, to live with his mother and her husband, eventually settling in Cleveland, Ohio.

  10. Hugh Maaskant : architect van de vooruitgang

    NARCIS (Netherlands)

    Provoost, M.

    2003-01-01

    Hugh Maaskant (1907–1977) is best known as the architect who made the biggest mark on the post-war reconstruction of Rotterdam with such buildings as the Groothandelsgebouw, the Hilton Hotel and the Lijnbaan flats. Beginning his career in 1937 as the partner of Willem van Tijen, Maaskant embarked on

  11. Responses to Hugh Heclo's "On Thinking Institutionally"

    Science.gov (United States)

    Fennell, Robert C.; Ascough, Richard S.; Liew, Tat-siong Benny; McLain, Michael; Westfield, Nancy Lynne

    2010-01-01

    Hugh Heclo's recent book "On Thinking Institutionally" (Paradigm Publishers, 2008) analyzes changes that have taken place in the past half century in how North Americans tend to think and act in institutions. The volume is receiving particular attention as it can be applied to higher education and to religious denominations, and so deserves…

  12. Hugh Maaskant : architect van de vooruitgang

    NARCIS (Netherlands)

    Provoost, Michelle

    2003-01-01

    Hugh Maaskant (1907–1977) is best known as the architect who made the biggest mark on the post-war reconstruction of Rotterdam with such buildings as the Groothandelsgebouw, the Hilton Hotel and the Lijnbaan flats. Beginning his career in 1937 as the partner of Willem van Tijen, Maaskant embarked on

  13. Boats Floating Villas

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    <正>As China’s economy develops, motor hotels are being replaced gradually by boats, never becoming luxuries to many people as before.Imaging what you will feel when you are admired by the people standing to see you driving a motorboat along the lakeside and seaside, leaving white waves.

  14. Dragon Boat Festival.

    Science.gov (United States)

    Lew, Gordon

    This is one of a series of elementary readers written in Cantonese and English and designed to familiarize children with the traditional major Chinese festivals celebrated by the Chinese in America. This booklet describes the celebration of the Dragon Boat Festival, which marks the beginning of summer. A brief background to the festival is…

  15. In the Same Boat

    Institute of Scientific and Technical Information of China (English)

    VALERIE; SARTOR

    2008-01-01

    Unlike the National Day or Spring Festival holidays that create massive logistical travel and traffic problems,the Dragon Boat Festival,falling on the fifth day of the fifth month of the Chinese lunar calendar or June 8 this year

  16. Eleven cities Solar boat challenge

    NARCIS (Netherlands)

    Verdult, E.

    2012-01-01

    TU Delft students are participating for the fourth time in the world championship solar boat race in Friesland, which begins on 8 July. Expectations are high because the TU Delft students were world champions in 2006 and 2008. In 2010, the solar boat was equipped with hydrofoils for the first time.

  17. On the Hughes model and numerical aspects

    KAUST Repository

    Gomes, Diogo A.

    2017-01-05

    We study a crowd model proposed by R. Hughes in [11] and we describe a numerical approach to solve it. This model comprises a Fokker-Planck equation coupled with an eikonal equation with Dirichlet or Neumann data. First, we establish a priori estimates for the solutions. Second, we study radial solutions and identify a shock formation mechanism. Third, we illustrate the existence of congestion, the breakdown of the model, and the trend to the equilibrium. Finally, we propose a new numerical method and consider two examples.

  18. Hugh Maaskant: architect van de vooruitgang

    OpenAIRE

    Provoost, M.

    2003-01-01

    Hugh Maaskant (1907–1977) is best known as the architect who made the biggest mark on the post-war reconstruction of Rotterdam with such buildings as the Groothandelsgebouw, the Hilton Hotel and the Lijnbaan flats. Beginning his career in 1937 as the partner of Willem van Tijen, Maaskant embarked on his most prolific period after establishing an independent practice in 1955. He produced the lion’s share of his work in the 1950s and ’60s, the very period architectural critics generally regard ...

  19. Donald Hugh Blocher (1928-2013).

    Science.gov (United States)

    Dowd, E Thomas

    2015-01-01

    This article memorializes Donald Hugh Blocher (1928-2013). Blocher, a giant in counseling psychology, was elected a fellow of the American Psychological Association (APA) in 1973, received a Distinguished Achievement Award from Harvard University in 1968, and served as president of APA Division 17 (Society of Counseling Psychology) in 1980. He obtained a Fulbright Lectureship at the University of Keele (United Kingdom) for 1968-1969, where he helped develop a counseling psychology program according to American standards. He also published many books, book chapters, and articles over the course of his professional career.

  20. Hugh Owen Thomas (1834-1891)

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    @@ Hugh Owen Thomas被称为英国骨科之父,他对英国乃至世界骨科作出了杰出的贡献. 早在17世纪,接骨师已经作为一个社会地位较高的职业在英国、法国兴盛起来.接骨师的技术通常是在家族内部传承而不会对外传授.

  1. Sandy ja Hugh - paar või mitte? / Hugh Grant, Sandra Bullock

    Index Scriptorium Estoniae

    Grant, Hugh, 1960-

    2003-01-01

    Romantilises komöödias "Kaks nädalat armumiseks" ("Two Weeks Notice"), režissöör Marc Lawrence, mängivad kaks kuulsat näitlejat. Staarid oma suhetest : Hugh Grant : "Sandra on geenius"; Sandra Bullock : "Oleme temaga nagu kaksikud!"

  2. Sandy ja Hugh - paar või mitte? / Hugh Grant, Sandra Bullock

    Index Scriptorium Estoniae

    Grant, Hugh, 1960-

    2003-01-01

    Romantilises komöödias "Kaks nädalat armumiseks" ("Two Weeks Notice"), režissöör Marc Lawrence, mängivad kaks kuulsat näitlejat. Staarid oma suhetest : Hugh Grant : "Sandra on geenius"; Sandra Bullock : "Oleme temaga nagu kaksikud!"

  3. Acute Charles Bonnet Syndrome following Hughes procedure.

    Science.gov (United States)

    Wilson, Michelle E; Pointdujour-Lim, Renelle; Lally, Sara; Shields, Carol L; Rabinowitz, Michael P

    2016-10-01

    A 69-year-old male experienced monocular formed visual hallucinations after occlusion of the right eye following resection of eyelid basal cell carcinoma and reconstruction with a Hughes procedure (tarsoconjunctival flap). His symptoms included recurrent, well-defined, organized, complex, formed images of small children playing in the snow. These visual phenomena occurred only in the occluded eye, began several hours after surgery, and recurred intermittently several times daily for 4 days, lasting several minutes with each occurrence. The patient retained insight into the false nature of the images throughout the duration of his symptoms, and the hallucinations resolved spontaneously while the flap was still in place. To our knowledge, this is the first reported case of Charles Bonnet Syndrome (CBS) following a Hughes procedure in a patient with normal visual acuity in the non-occluded fellow eye. Unlike other reported cases of acute onset CBS following transient monocular occlusion, hallucinations in the occluded eye remitted prior to restoration of vision in the occluded eye. Ophthalmologists should be aware of the potential for CBS following even transient monocular occlusion and should consider warning patients about its potential to occur.

  4. Sick boat syndrome

    Directory of Open Access Journals (Sweden)

    Dąbrowiecki Zbigniew

    2015-12-01

    Full Text Available Many pathogenic micro-organisms are likely to attack passengers of cruise ships and other vessels or travel between continents as a peculiar type of a “stowaway”. The epidemiological tests conducted since 1987 with regard to watercraft led to the coining of a term known as the Sick Boat Syndrome (SBS. The main illnesses encountered on watercraft include gastrointestinal diseases (foodborne and Legionellosis. Additionally, the ventilation and airconditioning systems of old commercial ships (the so-called Tramps constitute a real technical challenge. Conditioned air (with removed undesired odour and micro-organisms should constitute ca. 25% of circulating air. In practice this situation is not typical for vessels of this class. Unclean air poses a real hazard for the crew.

  5. The Boat Girl in the Photo

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    The Little Boat Girl THIS picture was taken at dusk, onestormy day, half a century ago. On April 21, 1949, one million soldiersof the Chinese People’s Liberation Army, alongmore than 500-kilometers of riverbank, quicklybroke through the "thousand-Li line of defence,"which had been painstakingly built up by theKuomintang, and forced the Changjiang River. At dusk on April 22, boatmen from Yangzhong,an island in the Changjiang River, hurried to thebank to row the follow-up units across. Despitearduous weather, the boatmen’s skill in fightingagainst wind and waves was considerable and, inthe soft lights of sunset, the rows of old woodenboats appeared to be flying on the ChangjiangRiver. A most impressive scene. Among the officers waiting on the riverbank tobe ferried across was one tall soldier, deeplyabsorbed in the sight of a young girl, not far away,

  6. Row, Row, Row Your Boat...

    Institute of Scientific and Technical Information of China (English)

    PHILIP JONES

    2010-01-01

    @@ My afternoon plans to go dragon boat racing on Houhai Lake in downtown Beijing could have started better. Cycling across town, a pedal snapped off my bicycle as I was aggressively building up speed across a Second Ring Road junction.

  7. By boat to CERN

    CERN Multimedia

    2009-01-01

    Hello, my name is Jordan Juras. I will be here at CERN for a 2-month period spanning mid-June through mid-August working as Student Journalist for The Bulletin. This is a conventional position, but the manner with which I arrived at CERN is quite the opposite. Sitting at work one May 12th morning, I came across a Bulletin article (No. 20-21/2009) while perusing the LHC website. It was advertising ‘Fisica in Barca in Europe 2009’. They were looking for physicists living along the Mediterranean coast between Lisbon and Genoa to help out with the programme. Though I do not hold the title of physicist, nor do I live in Europe (in fact I live just outside of Harrow, Ontario, Canada), I felt compelled to write an email, expressing my love for physics and my interest in helping out with the programme. To my surprise, my help on board was welcome, and I managed to find some discount airfare and I set out for the South of Italy to meet the boat in Bari. Between Bari and Tries...

  8. Hugh Blairs Lectures on Rhetoric and Belles Lettres

    DEFF Research Database (Denmark)

    Schatz-Jakobsen, Claus

    1989-01-01

    Artiklen nærlæser dekonstruktivt dele af den skotske retorikprofessor Hugh Blairs Lecures on Rhetoric and Belles Lettres (1783) og påviser splittelsen mellem to vidt forskellige retorik- og liltteraturhistoriske interesser, neoklassicistiske vs. romantiske....

  9. Síndrome de Hughes-Stovin

    Directory of Open Access Journals (Sweden)

    Sonia Pankl

    2015-04-01

    Full Text Available El síndrome de Hughes-Stovin es una entidad infrecuente caracterizada por trombosis venosa profunda y aneurismas de la arteria pulmonar, siendo su etiología y patogenia desconocida. Algunos autores la consideran una variante de la enfermedad de Behcet. Su curso natural es generalmente fatal. Se presenta con tos, disnea, hemoptisis, dolor torácico y fiebre. El tratamiento es con esteroides y agentes citotóxicos hasta la cirugía. Presentamos el caso de un hombre de 41 años que consultó por disnea, hemoptisis y dolor torácico, llegándose al diagnóstico de trombosis venosa profunda de miembro inferior derecho, trombo-embolismo de pulmón y aneurismas de arterias pulmonares. Recibió tratamiento con corticoides en altas dosis y 6 pulsos de ciclofosfamida de 1 gramo durante 6 meses, con regresión completa de los aneurismas y de la sintomatología.

  10. 76 FR 18391 - Safety Zone; Texas International Boat Show Power Boat Races; Corpus Christi Marina, Corpus...

    Science.gov (United States)

    2011-04-04

    ... American Tri-Hull Championship scheduled to take place during the Texas International Boat Show. The North American Tri-Hull Championship will consist of a series of power boat races for approximately 8-12 vessels... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Texas International Boat Show Power Boat...

  11. Alternative Design of Boat Fenders

    DEFF Research Database (Denmark)

    Banke, Lars

    1996-01-01

    On offshore platforms the purpose of fenders is to protect the oil-risers against minor accidental collisions with supply vessels. Normally, the fender is designed by use of thin-walled tubes. However, the tube itself is not capable of resisting the impact load of the boat. Therefore, alternative...

  12. Alternative Design of Boat Fenders

    DEFF Research Database (Denmark)

    Banke, Lars

    1996-01-01

    for the installation of the fender and perhaps for removing it if new oil-risers are to be initialled. The use of crane boats is expensive and weather-dependent.With these effect sin mind, a study of the energy absorption in the fender system, i.e. the fender itself and the frame, is needed for further development...

  13. Radiologic diagnosis of Fitz-Hugh-Curtis syndrome

    Institute of Scientific and Technical Information of China (English)

    WANG Cheng-lin; GUO Xue-jun; YUAN Zhi-dong; SHI Qiao; HU Xiao-hong; FANG Lin

    2009-01-01

    @@ Litz-Hugh-Curtis syndrome (FHCS) was reported by Curtis after he found a fibrous adhesion between the surface of the liver and peritoneum in patients with gonococcal pelvic inflammation during laparoscopy in 1930, and the first report by Fitz-Hugh as acute gonococcal peritonitis in the right upper quadrant abdomen was published in 1934.1,2 The so-called FHCS is believed to originate from an inflammation in the pelvis which may ascend toward the diaphragmatic surface of the liver along the right paracolic gutters to cause the inflammation of the liver caosule with right upper abdominal pain.3-7

  14. Francesca Hughes: Architecture of Error: Matter, Measure and the Misadventure of Precision

    DEFF Research Database (Denmark)

    Foote, Jonathan

    2016-01-01

    Review of "Architecture of Error: Matter, Measure and the Misadventure of Precision" by Francesca Hughes (MIT Press, 2014)......Review of "Architecture of Error: Matter, Measure and the Misadventure of Precision" by Francesca Hughes (MIT Press, 2014)...

  15. Tank Tests of Model 36 Flying Boat Hull

    Science.gov (United States)

    Allison, John

    1938-01-01

    N.A.C.A. Model 36, a hull form with parallel middle body for half the length of the forebody and designed particularly for use with stub wings, was tested according to the general fixed-trim method over the range of practical loads, trims, and speeds. It was also tested free to trim with the center of gravity at two different positions. The results are given in the form of nondimensional coefficients. The resistance at the hump was exceptionally low but, at high planing speeds, afterbody interference made the performance only mediocre.

  16. A study of traditional boats of Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Shaikh, Z.A.; Tripati, S.; Shinde, V.

    prominent role in distribution of traditional watercraft (Fig. 1). Skin boats are found in rivers because of calm water (Fig. 2) but dugouts and dugouts with outrigger are found mostly in rivers, tributaries, estuaries and all along the coastline. Extended... fishing (short distance) III Sewn Plank Boat with keel Revechem hode Tiracol, Chapora, Amona 10 to 12 Removal of sand from river bed IV Skin boat Karnataka Inland fishing 4 outrigger. Instead of using different types of timber builders...

  17. Hugh Grant's Image Restoration Discourse: An Actor Apologizes.

    Science.gov (United States)

    Benoit, William L.

    1997-01-01

    Examines the strategies used by actor Hugh Grant (in his appearances on talk shows) to help restore his reputation after he was arrested for lewd behavior with a prostitute. Uses this case as a springboard to contrast entertainment image repair with political and corporate image repair, arguing that important situational differences can be…

  18. Additional Responses to Hugh Heclo's "On Thinking Institutionally"

    Science.gov (United States)

    Lincoln, Timothy D.; Fennell, Robert C.

    2011-01-01

    Issue 13:3 of this journal (July 2010) included a "Conversation" on Hugh Heclo's recent publication "On Thinking Institutionally" (Paradigm Publishers, 2008) with a book review by Robert Fennell and responses by Richard Ascough, Tat-siong Benny Liew, Michael McLain, and Lynne Westfield. Here we publish two additional responses to this same book.…

  19. Vernon Hughes and the Quest for the Proton's Spin

    Science.gov (United States)

    Jaffe, Robert L.

    2004-12-01

    Vernon Hughes dedicated much of the latter part of his career to the question "What carries the spin of the proton?" The question remains unanswered and near the top of the list of fascinating questions in QCD. I present a perspective on the question and Vernon's pursuit of an answer.

  20. Dr. Vernon W. Hughes, 81, authority on the subatomic

    CERN Multimedia

    Lavietes, S

    2002-01-01

    "Dr. Vernon W. Hughes, a Yale physicist whose investigation of particles called muons poked holes in standard subatomic theory and provided evidence for the existence of previously undetected matter, died at Yale-New Haven Hospital last Tuesday" (1/2 page).

  1. Hugh Hefner - maailma esi-playboy / Neeme Raud

    Index Scriptorium Estoniae

    Raud, Neeme, 1969-

    2004-01-01

    Ajakirja Playboy asutajast Hugh Hefner'ist, tema elufilosoofiast ja põhimõtetest erootikaväljaande sisu kujundamisel. Ärijuhi Christie Hefner'i sõnul on rahvusvahelise multimeedia-meelelahutusfirma praeguseks eesmärgiks brändi sobitamine erinevatesse meediavormidesse. Lisa: Mis on Playboy?

  2. Differential Response: What to Make of the Existing Research? A Response to Hughes et al.

    Science.gov (United States)

    Drake, Brett

    2013-01-01

    This article is a response to "Issues in Differential Response", a review of the current evidence pertaining to differential response (DR) programs in child protective services (CPS). In my view, the Hughes, Rycus, Saunders-Adams, Hughes, and Hughes article suffers from several weaknesses. First, DR programs are critiqued as if they were…

  3. Obituary: Lawrence Hugh Aller, 1913-2003

    Science.gov (United States)

    Kaler, James B.

    2003-12-01

    Michigan, he taught a two-semester course in advanced general astronomy that covered nearly everything, in addition to a remarkable four-semester sequence in astrophysics (general, stellar atmospheres, nebular astrophysics, and stellar interiors). These were backed up by an extraordinary set of books. In 1943, Goldberg and he turned out the seminal toms, Stars, and Nebulae. (A solo third edition was published in 1991.) Then in 1953 arrived "The Atmospheres of the Sun and Stars" (revised a decade later), a tour de force on the physics of stellar plasmas and radiative transfer that became the bible of a generation of astronomers. "Nuclear Transformations, Stellar Interiors, and Nebulae" appeared a year later, and "Gaseous Nebulae" two years after that (rewritten in 1984 as "Physics of Thermal Gaseous Nebulae"). Not having a computer available in the early years, he used his students, creating mammoth "Aller Problems" that solved the equations for results that went into the books. Never formally published were two massive tomes of advanced general astronomy. To those of us lucky enough to have them, they serve as references to this day. His students, both undergraduate and graduate, are everywhere, their own students in turn carrying on Lawrence's ideas and work. In 1941, Lawrence married Rosalind Duncan Hall (who survives), and together they raised three children: Hugh, Gwen, and Raymond. Not only did one son become an astronomer, but so has one granddaughter (a dynasty established). Lawrence was absorbed by news and politics. He hated injustice of any kind, and let you know about it. He could entertain for hours with stories of his youth and of other astronomers, never realizing that he would also be the source of affectionate stories that would be told and retold by his own students. Of beautiful heart, he was a good father, both to his own children and to those he adopted as his students, none of whom, having been taught by him, will ever forget. Incredibly prolific, his

  4. Analysis of Propulsion Efficiency on Fishing Boat 30 GRT

    OpenAIRE

    Hasbullah, Mansyur; Muhammad, Andi Haris; Daud, Syarifuddin

    2016-01-01

    Fishing vessel is defined as a ship, boat or other floating component used to do fishing activities, to support fishing operations, fish cultivation, fish processing, fisheries training and research/exploration of fishery. The fishing boat consist of ship or a small boat be in the form of canoe boat (without engine) driven by paddle power or sail, outboard motor boats up to large fishing boat made of wood, fiber or steel with diesel engine propulsion. Shipbuilding material take effect on the ...

  5. Swiss fuel cell passenger and pleasure boats

    Energy Technology Data Exchange (ETDEWEB)

    Affolter, J.-F.

    2000-07-01

    This paper published by the University of Applied Science in Yverdon-les-Bains, Switzerland, looks at the development of electrically driven small boats that are powered by fuel cells. The various implementations of the test boats are described. Starting with a 100-watt PEM fuel cell built by the Paul Scherrer Institute (PSI) and the University of Applied Science in Solothurn, Switzerland, for educational purposes, a small pedal-boat was electrified. The paper describes the development of four further prototypes and introduces a new project for a 6-passenger leisure boat powered by a 2 kW PEFC fuel cell. Apart from the fuel cells, various other components such as propellers and control electronics are discussed as are the remaining problems still to be solved before the cells and boats can be marketed. Since they were carried out at a technical university, these projects are said to have provided an excellent way of teaching new technologies to students.

  6. Langston Hughes and his poem “Harlem”

    Institute of Scientific and Technical Information of China (English)

    郝红

    2005-01-01

    James Langston Hughes was born February 1. 1902, in Joplin, Missouri. His parents divorced when he was a small child, and his father moved to Mexico. He was raised by his Grandmother until he was thirteen, when he moved to Lincoln,Illinois, to live with his mother and her husband, eventually settling in Cleveland, Ohio. It was in I,incoln, Illinois, that Hughes began writing poetry. Following graduation, he spent a year in Mexico and a year at Columbia University. During these years, he held old jobs as an assistant cook, launderer, and a busboy, and traveled to Africa and Europe working as a seaman. In November 1924, he moved to Washington,

  7. Fitz-Hugh-Curtis综合征7例

    Institute of Scientific and Technical Information of China (English)

    焦浦生

    2000-01-01

    @@ FHC综合征Fitz-Hugh-Curtis Syntrome)是继发于盆腔感染的肝包膜炎症反应性疾病.该综合征典型临床表现是右上腹痛,发热伴有盆腔炎.现将我院近年来诊治FHC综合征7例总结中下.

  8. Bifurcaciones del Sistema de FitzHugh-Nagumo (FHN

    Directory of Open Access Journals (Sweden)

    Fernando Ongay Larios

    2011-01-01

    Full Text Available La familia paramétrica de los sistemas de FitzHugh-Nagumo es rica en bifurcaciones (Rocsoreanu et al., 2000. En este artículo estudiamos las bifurcaciones silla-nodo y de Hopf desde el punto de vista matemático de esta familia y se describen completamente los conjuntos de bifurcación en el espacio de parámetros.

  9. The Spin Structure of the Nucleon:. a Hughes Legacy

    Science.gov (United States)

    Cates, Gordon D.

    2004-12-01

    More than any other individual, Vernon Hughes can be pointed to as the father of the experimental investigation of nucleon spin structure. Even theoretical development in this area was spurred on by Vernon's pioneering efforts to make the control of spin degrees of freedom an experimental reality. This talk traces some of Vernon's work in this area, as well as examining, briefly and not in a complete fashion, some of the other work that can be looked upon as Vernon's legacy.

  10. Remembrance of Hugh E. Huxley, a founder of our field.

    Science.gov (United States)

    Pollard, Thomas D; Goldman, Yale E

    2013-09-01

    Hugh E. Huxley (1924-2013) carried out structural studies by X-ray fiber diffraction and electron microscopy that established how muscle contracts. Huxley's sliding filament mechanism with an ATPase motor protein taking steps along an actin filament, established the paradigm not only for muscle contraction but also for other motile systems using actin and unconventional myosins, microtubules and dynein and microtubules and kinesin.

  11. Flying Things

    DEFF Research Database (Denmark)

    Cermak, Daniel

    2016-01-01

    Daniel Cermak-Sassenrath. Flying Things. Installation. Kulturnatten 2016, Danish Science Ministry, Copenhagen, DK, Oct 14, 2016.......Daniel Cermak-Sassenrath. Flying Things. Installation. Kulturnatten 2016, Danish Science Ministry, Copenhagen, DK, Oct 14, 2016....

  12. Cost Benefit Analysis of Boat Lifts

    Science.gov (United States)

    2014-09-01

    to avoid the potential of mishaps due to jumping across open water to reach both sides of the lift. With the life expectancy of a boat ramp...to jumping across open water to reach both sides of the lift. Cost Benefit Analysis of Boat Lifts 11 UNCLAS//Public | CG-926 R&DC | B. Fike...equipment from boats and craft that have been corrosion problems in the past. such as wire rope and non-stainless steel hardware. Corrosion is a function

  13. 50 CFR 86.13 - What is boating infrastructure?

    Science.gov (United States)

    2010-10-01

    ... (CONTINUED) FINANCIAL ASSISTANCE-WILDLIFE SPORT FISH RESTORATION PROGRAM BOATING INFRASTRUCTURE GRANT (BIG) PROGRAM General Information About the Grant Program § 86.13 What is boating infrastructure? Boating... 50 Wildlife and Fisheries 6 2010-10-01 2010-10-01 false What is boating infrastructure?...

  14. Marianas Boat Fishing Cost Earnings Study 2011

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data represent a cost-earnings study of the boat based fishing in the Mariana Archipelago fielded in 2011. Data collected include fisher classification, vessel...

  15. Guam Boat-based Creel Survey

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Similar to other boat-based survey in basic design, this system is run by the Div. of Aquatic and Wildlife Resources (DAWR) and has been in operation since about...

  16. Small-boat Cetacean Surveys Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The database contains multiple spreadsheets that hold data collected during each small-boat survey project conducted by the PIFSC CRP. This includes a summary of the...

  17. American Samoa Boat-based Creel Survey

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Boat-based creel survey data have been collected and processed by the American Samoa Department of Marine and Wildlife Resources (DMWR) staff since about 1982 and...

  18. Food Safety While Hiking, Camping and Boating

    Science.gov (United States)

    ... Standard Forms FSIS United States Department of Agriculture Food Safety and Inspection Service About FSIS District Offices Careers ... Web Content Viewer (JSR 286) Actions ${title} Loading... Food Safety While Hiking, Camping & Boating Outdoor activities are popular ...

  19. Improvement and Validation of the BOAT Algorithm

    Directory of Open Access Journals (Sweden)

    Yingchun Liu

    2014-04-01

    Full Text Available The main objective of this paper is improving the BOAT classification algorithm and applying it in credit card big data analysis. Decision tree algorithm is a data analysis method for the classification which can be used to describe the extract important data class models or predict future data trends. The BOAT algorithm can reduce the data during reading and writing the operations, the improved algorithms in large data sets under the operating efficiency, and in line with the popular big data analysis. Through this paper, BOAT algorithm can further improve the performance of the algorithm and the distributed data sources under the performance. In this paper, large banking sectors of credit card data as the being tested data sets. The improved algorithm, the original BOAT algorithms, and the performance of other classical classification algorithms will be compared and analyzed.

  20. Hugh de Wardener - the Man and the Scientist.

    Science.gov (United States)

    Phillips, M E; de Wardener, S

    2016-02-01

    Hugh de Wardener died on 29th September 2013, ten days before his 98th birthday. He had a diverse upbringing and qualified in Medicine in 1939. He joined the army but was captured in 1942 and imprisoned in Singapore and Thailand until 1945. His clinical care of fellow prisoners was highly regarded. He preserved their clinical records and used them, post-war, to write two Lancet papers. One showed, for the first time, that Wernickes encephalopathy could be caused by severe malnutrition and cured by small doses of vitamin B1. His later academic interests were based on the emphasis he placed on renal physiology. This applied to the topic most associated with his name-Natriuretic Hormone. Whilst de Wardener never isolated this hormone, his early experiments, demonstrating that a third factor other than GFR and aldosterone affected renal sodium transport, were substantiated by others. Hugh had many research interests: pyelonephritis, renal histology, maintenance dialysis and metabolic/renal bone disease. In his later years he researched intensively into the role of sodium and salt in the aetiology of essential hypertension. Hugh was president of the International Society of Nephrology (1969-72) and the UK Renal Association (1975-78). He received many awards and recognitions from across the world, many of them after his (so-called) retirement. Throughout his career he never neglected the care of his patients. As Bob Schrier wrote in his obituary of de Wardener in Kidney International he was a caring physicianwhose dedication to his patients welfare was exemplary.

  1. Some Numerical Aspects on Crowd Motion - The Hughes Model

    KAUST Repository

    Gomes, Diogo A.

    2016-01-06

    Here, we study a crowd model proposed by R. Hughes in [5] and we describe a numerical approach to solve it. This model comprises a Fokker-Planck equation coupled with an Eikonal equation with Dirichlet or Neumann data. First, we establish a priori estimates for the solution. Second, we study radial solutions and identify a shock formation mechanism. Third, we illustrate the existence of congestion, the breakdown of the model, and the trend to the equilibrium. Finally, we propose a new numerical method and consider two numerical examples.

  2. Flying Scared

    DEFF Research Database (Denmark)

    Dal Sie, Marco; Josiassen, Alexander

    service quality expectations and fear of flying affect travellers' flight choices on long-haul flights. The study was set in Bangkok and primary data were obtained from a large sample of travelers departing from Suvarnabhumi Airport. While service quality emerged as a relevant factor, fear of flying didn......’t turn out as a variable affecting travellers’ choices....

  3. Surviving To Write and Writing To Survive: The Complex Case of Langston Hughes.

    Science.gov (United States)

    Ostrom, Hans

    Studying the life of Langston Hughes in the context of how to teach freshman composition can shed light on two sometimes conflicting pedagogies, the expressivist and the social-constructionist. A discouraging period of fierce criticism, illness, depression, and financial woes coincided with Hughes' 39th birthday, which his biographer Arnold…

  4. The Progression About Fitz-Hugh-Curtis Syndrome Study%Fitz-Hugh-Curtis综合征研究进展

    Institute of Scientific and Technical Information of China (English)

    靳翠平; 尚玉敏

    2009-01-01

    Fitz-Hugh-Curtis综合征是盆腔感染合并肝周围炎,主要涉及肝包膜而无肝实质损害,在慢性盆腔炎患者中较为常见.病原菌主要是淋病奈瑟菌及衣原体,主要临床表现为右下腹痛,并可导致慢性腹痛、不孕、异位妊娠等多种并发症.可结合腹腔CT、相关实验室检验及腹腔镜检查对其进行诊断及鉴别诊断,并通过敏感抗生素及腹腔镜手术进行有效治疗.就Fitz-Hugh-Curtis综合征病因与发病机制、临床特征、并发症、诊断、治疗及相关意义进行综述.

  5. 75 FR 29391 - National Safe Boating Week, 2010

    Science.gov (United States)

    2010-05-26

    ... passengers free from harm. Wearing a Coast Guard-approved life jacket, taking a boating safety course, being.... To help save lives and prevent accidents, the United States Coast Guard partners with boating...

  6. Tour Group Cruises the Three Gorges in Luxury Boat

    Institute of Scientific and Technical Information of China (English)

    1995-01-01

    BOARDING "Sheena," a luxury boat owned by the Sino-American Deluxe Boat Company, I began a five-day tour to Sanxia (Three Gorges of the Changjiang River) with ten other European and American tourists.

  7. A Powerful Friendship: Theodore von Karman and Hugh L. Dryden

    Science.gov (United States)

    Gorn, Michael

    2003-01-01

    During their long personal friendship and professional association, Theodore von Karman (1882-1963) and Hugh L. Dryden (1898-1965) exercised a pivotal if somewhat elusive influence over American aeronautics and spaceflight. Both decisive figures in organizing scientists and engineers at home and abroad, both men of undisputed eminence in their technical fields, their range of contacts in government, academia, the armed forces, industry, and professional societies spanned the globe to an extent unparalleled then as now. Moreover, because they coordinated their activities closely, their combined influence far exceeded the sum of each one s individual contributions. This paper illustrates their personal origins as well as the foundations of their friendship, how their relationship became a professional alliance, and their joint impact on the world of aeronautics and astronautics during the twentieth century.

  8. Realistic model of compact VLSI FitzHugh-Nagumo oscillators

    Science.gov (United States)

    Cosp, Jordi; Binczak, Stéphane; Madrenas, Jordi; Fernández, Daniel

    2014-02-01

    In this article, we present a compact analogue VLSI implementation of the FitzHugh-Nagumo neuron model, intended to model large-scale, biologically plausible, oscillator networks. As the model requires a series resistor and a parallel capacitor with the inductor, which is the most complex part of the design, it is possible to greatly simplify the active inductor implementation compared to other implementations of this device as typically found in filters by allowing appreciable, but well modelled, nonidealities. We model and obtain the parameters of the inductor nonideal model as an inductance in series with a parasitic resistor and a second order low-pass filter with a large cut-off frequency. Post-layout simulations for a CMOS 0.35 μm double-poly technology using the MOSFET Spice BSIM3v3 model confirm the proper behaviour of the design.

  9. Right Pleural Effusion in Fitz-Hugh-Curtis Syndrome

    Directory of Open Access Journals (Sweden)

    Tajiri,Takuma

    2006-10-01

    Full Text Available Right pleural effusion was diagnosed in a 36-year-old woman with right upper quadrant pain and fever. Enhanced pelvic computed tomography performed because of irregular genital bleeding revealed the pelvic inflammatory disease. Upon further questioning, the patient confirmed that she had recently undergone therapy for Chlamydia trachomatis infection. Therefore she was given an injection of tetracycline because we suspected Fitz-Hugh-Curtis syndrome (FHCS, a pelvic inflammatory disease characterized by perihepatitis associated with chlamydial infection. A remarkable clinical response to antibiotics was noted. The right upper quadrant pain was due to perihepatitis, and the final diagnosis was FHCS. Right pleural effusion may be caused by inflammation of the diaphragm associated with perihepatitis. Once chlamydial infection reaches the subphrenic liver, conditions in the closed space between the liver and diaphragm due to inflammatory adhesion may be conductive to chlamydial proliferation. The possibility of FHCS should be considered in patients and carefully distinguished from other abdominal diseases.

  10. 75 FR 22423 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2010-04-28

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... public meeting of the Sport Fishing and Boating Partnership Council (Council). DATES: The meeting will be... announce that the Sport Fishing and Boating Partnership Council will hold a meeting. Background The...

  11. 78 FR 4161 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2013-01-18

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... (Service), announce a public teleconference of the Sport Fishing and Boating Partnership Council (Council.... App., we announce that Sport Fishing and Boating Partnership Council will hold a...

  12. 76 FR 7579 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2011-02-10

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... public meeting of the Sport Fishing and Boating Partnership Council (Council). DATES: The meeting will be... Federal Advisory Committee Act, 5 U.S.C. App., we announce that the Sport Fishing and Boating...

  13. 75 FR 47624 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2010-08-06

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... public meeting of the Sport Fishing and Boating Partnership Council (Council). DATES: The meeting will be.... App., we announce that the Sport Fishing and Boating Partnership Council will hold a meeting...

  14. 76 FR 1628 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2011-01-11

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife...), announce a public teleconference of the Sport Fishing and Boating Partnership Council (Council). DATE(S... private sectors of the sport fishing, boating, and conservation communities and is organized to...

  15. 78 FR 33856 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2013-06-05

    ...; FF09X60000-FVWF97920900000-XXX] Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... (Service), announce a public teleconference of the Sport Fishing and Boating Partnership Council (Council... Act, 5 U.S.C. App., we announce that Sport Fishing and Boating Partnership Council will hold...

  16. 77 FR 61626 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2012-10-10

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife...), announce a public meeting of the Sport Fishing and Boating Partnership Council (Council). A Federal.... App., we announce that the Sport Fishing and Boating Partnership Council will hold a...

  17. 77 FR 26784 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2012-05-07

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... (Service), announce a public teleconference of the Sport Fishing and Boating Partnership Council (Council.... App., we announce that Sport Fishing and Boating Partnership Council will hold a...

  18. Traditional boat-building and navigational techniques of southern Orissa

    Digital Repository Service at National Institute of Oceanography (India)

    Tripati, S.

    of the region. No written records on ancient boatbuilding and navigational aids of the region are available for the reconstruction of the technique of boat-building. Boats of this area have been classified into two categories, namely planked and log boats...

  19. 21 CFR 1240.95 - Sanitation of water boats.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Sanitation of water boats. 1240.95 Section 1240.95... DISEASES Source and Use of Potable Water § 1240.95 Sanitation of water boats. No vessel engaged in interstate traffic shall obtain water for drinking and culinary purposes from any water boat unless the...

  20. 36 CFR 1002.63 - Boating and water use activities.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Boating and water use activities. 1002.63 Section 1002.63 Parks, Forests, and Public Property PRESIDIO TRUST RESOURCE PROTECTION, PUBLIC USE AND RECREATION § 1002.63 Boating and water use activities. Swimming, boating and the use of...

  1. 46 CFR 171.155 - Drainage of an open boat.

    Science.gov (United States)

    2010-10-01

    ... PERTAINING TO VESSELS CARRYING PASSENGERS Drainage of Weather Decks § 171.155 Drainage of an open boat. The deck within the hull of an open boat must drain to the bilge. Overboard drainage of the deck is not... 46 Shipping 7 2010-10-01 2010-10-01 false Drainage of an open boat. 171.155 Section 171.155...

  2. Recreational Boating Accidents and the Contribution of Boating Under the Influence

    Data.gov (United States)

    Department of Homeland Security — This report includes statistical information for the fifty states, five U.S. territories, and the District of Columbia on recreational boating accident data and the...

  3. 77 FR 18767 - Boating Infrastructure Grant Program

    Science.gov (United States)

    2012-03-28

    ... current state of boating that would allow the Service and States to develop a strategy to address areas of... attraction is available. We expand this section to include the need for services that help transient boaters. A significant destination, such as a national park or entertainment attraction, may entice boaters...

  4. Dragon Boat Festival (Dyun Ngh Jit).

    Science.gov (United States)

    Wu, Julia; Quan, Ella Y.

    This bilingual-bicultural reader in Cantonese and English is intended for elementary school children in a bilingual education setting. Pen-and-ink drawings illustrate the story of the traditional dragon boat festival. Each page of the text is written in Chinese characters, Romanized form, and in English. (NCR)

  5. Delta Lloyd solar boat team; sailing 30km/h with a solar-powered boat, using hydrofoils

    NARCIS (Netherlands)

    Tra, M.

    2013-01-01

    Every two years since 2006, the Delta Lloyd Solar Boat Team builds a boat to participate in the World Cup for solar-powered boats, across the ‘Elfsteden-route’, the famous tour of the eleven cities in the Dutch province of Friesland. The upcoming year the team, consisting of a new group of students,

  6. Time flies

    DEFF Research Database (Denmark)

    Wit, Janneke

    , the LS fly might be able to spend energy more generously on different tasks. Therefor, the capacity of LS and C lines to locate resources in a natural environment was tested. It turns out that LS flies are less likely to find food than C flies in such a setting, yet that as they age, their ability...... to locate food decreases slower than that of C lines. Gene expression of 10 candidate genes for longevity was quantified in two types of C and LS lines at three different ages. One of these genes, CG32638, indeed appears to be involved in life span determination in both males and females, regardless...... of mating status. Generalising studies on ageing in D. melanogaster can be cumbersome, especially in light of discrepancy between correlated responses between studies. To elucidate which mechanisms might be conserved due to evolutionary constraints, life span of 13 species of Drosophila was determined...

  7. Hughes, Twain, Child, and Sanger: Four Who Locked Horns with the Censors

    Science.gov (United States)

    Meltzer, Milton

    1969-01-01

    A look at the lives and conflicts of four writers--Langston Hughes, Mark Twain, Lydia Maria Child, and Margaret Sanger--who faced public criticism and censorship because oftheir views on controversial issues. (RM)

  8. Flying Cities

    DEFF Research Database (Denmark)

    Herbelin, Bruno; Lasserre, Sebastien; Ciger, Jan

    2008-01-01

    . This cross-modal interaction not only supports our artistic messages, but also aims at providing anyone with a pleasant and stimulating feedback from her/his speech activity. As the feedback we have received when presenting Flying Cities was very positive, our objective is now to cross the bridge between art......Flying Cities is an artistic installation which generates imaginary cities from the speech of its visitors. Thanks to an original interactive process analyzing people's vocal input to create 3D graphics, a tangible correspondence between speech and visuals opens new possibilities of interaction...

  9. Investidura com a doctor honoris causa de l'Excm. Sr. Hugh Scott Fogler

    OpenAIRE

    Diversos autors

    2016-01-01

    Investidura com a doctor honoris causa del senyor Hugh Scott Fogler. Sessió acadèmica extraordinària, 15 d'abril de 2016. Elogi del candidat a càrrec del doctor Azael Fabregat Llagostera. Discurs d’investidura pronunciat pel senyor Hugh Scott Fogler. Paraules de benvinguda pronunciades pel doctor Josep Anton Ferré Vidal, Rector Magfc. de la Universitat.

  10. STS-40 Payload Specialist Millie Hughes-Fulford trains in JSC's SLS mockup

    Science.gov (United States)

    1987-01-01

    STS-40 Payload Specialist Millie Hughes-Fulford conducts Spacelab Life Sciences 1 (SLS-1) Experiment No. 198, Pulmonary Function During Weightlessness, in JSC's Life Sciences Project Division (LSPD) SLS mockup located in the Bioengineering and Test Support Facility Bldg 36. Hughes-Fulford monitors instruments and settings on Rack 8's panels. Behind her in the center aisle are the body mass measurement device (foreground) and the stowed bicycle ergometer.

  11. Archetypal Analysis of The Open Boat

    Institute of Scientific and Technical Information of China (English)

    朱娟

    2013-01-01

      The Open Boat is written by Stephen Crane according to his own experience of encountering a shipwreck. This short nov⁃el is not only a legend, but also a complex of the author’s thinking of life and human and a fable of men’s lives. It is full of symbols and metaphors. To interpret the meaning of this novel, this paper is engaged to have an archetypal analysis of this short story.

  12. Pulmonary cytotoxicity of secondary metabolites of Stachybotrys chartarum (Ehrenb.) Hughes.

    Science.gov (United States)

    Pieckova, Elena; Hurbankova, Marta; Cerna, Silvia; Pivovarova, Zuzana; Kovacikova, Zuzana

    2006-01-01

    Damp dwellings represent suitable conditions for extended indoor moulds. A cellulolytic micromycete Stachybotrys chartarum (Ehrenb.) Hughes is considered to be a tertiary colonizer of surfaces in affected buildings. Known adverse health effects of S. chartarum result from its toxins--trichothecenes or atranones, as well as spirolactams. Mechanism of their potential pathological effects on the respiratory tract has not yet been sufficiently clarified. The cytotoxic effects of complex chloroform-extractable endo- (in biomass) and exometabolites (in cultivation medium) of an indoor S. chartarum isolate of an atranone chemotype, grown on a liquid medium with yeast extract and sucrose at 25 degrees C for 14 d, on lung tissue were evaluated in the 3-day experiment. For the purpose, 4 mg of toxicants were intratracheally instilled in 200 g Wistar male rats. A trichothecene mycotoxin diacetoxyscirpenol was used as the positive control. Bronchoalveolar lavage (BAL) parameters--viability and phagocytic activity of alveolar macrophages (AM), activity of lactate dehydrogenase, acid phosphatase and cathepsin D in cell-free BAL fluid (BALF), as well as in BAL cells, were measured. Acute exposure to the metabolites caused statistically significant changes, indicating lung tissue injury in the experimental animals. Decreased AM viability and increased activity of lysosomal enzyme cathepsin D in BAL cells after fungal exometabolite exposure were the most impressive. As toxic principles were found predominantly in the growth medium, toxins were more likely responsible for lung cell damage than e.g. fungal cell wall components. S. chartarum toxic metabolites can contribute to the ill health of occupants of mouldy building after inhalation of contaminated aerosol.

  13. Flying Cities

    DEFF Research Database (Denmark)

    Ciger, Jan

    2006-01-01

    The Flying Cities artistic installation brings to life imaginary cities made from the speech input of visitors. In this article we describe the original interactive process generating real time 3D graphics from spectators' vocal inputs. This example of cross-modal interaction has the nice property...... of providing a tangible correspondence between the two spaces. This interaction mean has proved to suit the artistic expression well but it also aims at providing anyone with a pleasant and stimulating feedback from speech activity, a new medium for creativity and a way to visually perceive a vocal performance....... As the feedback we have received when presenting Flying Cities was very positive, our objective now is to cross the bridge between art and the potential applications to the rehabilitation of people with reduced mobility or for the treatment of language impairments....

  14. Clinical outcome of Fitz-Hugh-Curtis syndrome mimicking acute biliary disease

    Institute of Scientific and Technical Information of China (English)

    Seong Yong Woo; Jin Il Kim; Dae Young Cheung; Se Hyun Cho; Soo-Heon Park; Joon-Yeol Han; Jae Kwang Kim

    2008-01-01

    AIM: To analyze the clinical characteristics of patients diagnosed with Fitz-Hugh-Curtis syndrome.METHODS: The clinical courses of patients that visited St. Mary's Hospital with abdominal pain from January 2005 to December 2006 and were diagnosed with Fitz-Hugh-Curtis syndrome were examined.RESULTS: Fitz-Hugh-Curtis syndrome was identified in 22 female patients of childbearing age; their mean age was 31.0 + 8.1 years. Fourteen of these cases presented with pain in the upper right abdomen alone or together with pain in the lower abdomen,and six patients presented with pain only in the lower abdomen. The first impression at the time of visit was acute cholecystitis or cholangitis in 10 patients and acute appendicitis or pelvic inflammatory disease in eight patients. Twenty-one patients were diagnosed by abdominal computer tomograghy (CT), and the results of abdominal sonography were normal for 10 of these patients. Ch/amydia trichomatis was isolated from 18 patients. Two patients underwent laparoscopic adhesiotomy and 20 patients were completely cured by antibiotic treatment.CONCLUSION: For women of childbearing age with acute pain in the upper right abdomen alone or together with pain in the lower abdomen, Fitz-HughCurtis syndrome should be considered during differential diagnosis. Moreover, in cases suspected to be Fitz-HughCurtis syndrome, abdominal c-r, rather than abdominal sonography, assists in the diagnosis.

  15. 78 FR 38999 - Recreational Boating-Estimating Benefits of Reducing Injuries

    Science.gov (United States)

    2013-06-28

    ... SECURITY Coast Guard Recreational Boating--Estimating Benefits of Reducing Injuries AGENCY: Coast Guard... Boating Injuries: Alternative Sources of Information on Fatalities, Injuries, and ] Property Damages... Reducing Recreational Boating Injuries: Alternative Sources of Information on Fatalities, Injuries, and...

  16. Radio-controlled boat for measuring water velocities and bathymetry

    Science.gov (United States)

    Vidmar, Andrej; Bezak, Nejc; Sečnik, Matej

    2016-04-01

    Radio-controlled boat named "Hi3" was designed and developed in order to facilitate water velocity and bathymetry measurements. The boat is equipped with the SonTek RiverSurveyor M9 instrument that is designed for measuring open channel hydraulics (discharge and bathymetry). Usually channel cross sections measurements are performed either from a bridge or from a vessel. However, these approaches have some limitations such as performing bathymetry measurements close to the hydropower plant turbine or downstream from a hydropower plant gate where bathymetry changes are often the most extreme. Therefore, the radio-controlled boat was designed, built and tested in order overcome these limitations. The boat is made from a surf board and two additional small balance support floats. Additional floats are used to improve stability in fast flowing and turbulent parts of rivers. The boat is powered by two electric motors, steering is achieved with changing the power applied to left and right motor. Furthermore, remotely controlled boat "Hi3" can be powered in two ways, either by a gasoline electric generator or by lithium batteries. Lithium batteries are lighter, quieter, but they operation time is shorter compared to an electrical generator. With the radio-controlled boat "Hi3" we can perform measurements in potentially dangerous areas such as under the lock gates at hydroelectric power plant or near the turbine outflow. Until today, the boat "Hi3" has driven more than 200 km in lakes and rivers, performing various water speed and bathymetry measurements. Moreover, in future development the boat "Hi3" will be upgraded in order to be able to perform measurements automatically. The future plans are to develop and implement the autopilot. With this approach the user will define the route that has to be driven by the boat and the boat will drive the pre-defined route automatically. This will be possible because of the very accurate differential GPS from the Sontek River

  17. Flying Cities

    DEFF Research Database (Denmark)

    Ciger, Jan

    2006-01-01

    of providing a tangible correspondence between the two spaces. This interaction mean has proved to suit the artistic expression well but it also aims at providing anyone with a pleasant and stimulating feedback from speech activity, a new medium for creativity and a way to visually perceive a vocal performance......The Flying Cities artistic installation brings to life imaginary cities made from the speech input of visitors. In this article we describe the original interactive process generating real time 3D graphics from spectators' vocal inputs. This example of cross-modal interaction has the nice property...

  18. Flying Fortress

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    当欧洲的年轻人想到关于德国的两种熊,一个是传统的布娃娃熊,另一个就是充满欧洲街头墙上的Teddy熊涂鸦,而这个涂鸦熊的创作者就是著名的涂鸦艺术家“Flying Fortress”,他称这些熊军队为“Teddy Tmops”。

  19. Case of Fitz-Hugh-Curtis syndrome in male without presentation of sexually transmitted disease.

    Science.gov (United States)

    Yi, Haram; Shim, Chan Sup; Kim, Gyu Won; Kim, Jung Seok; Choi, In Zoo

    2015-11-16

    Fitz-Hugh-Curtis syndrome is a type of perihepatitis that causes liver capsular infection without infecting the hepatic parenchyma or pelvis. Fitz-Hugh-Curtis syndrome is known to occur commonly in women of childbearing age who do not use oral contraceptives and have sexual partners older than 25 years of age. However, the syndrome has been reported to occur rarely in males. The clinical symptoms are right upper quadrant pain and tenderness, and pleuritic right sided chest pain. The clinical presentation is similar in male and female. We experienced a case of Fitz-Hugh-Curtis syndrome in a 60-year-old man with the chief complaint of right upper quadrant abdominal pain. Despite a previous history of gonorrhea, we have also described our experiences of improved symptoms and recovery with allopathic medicines and have thereby reported the present case with a literature review.

  20. Real time optical edge enhancement using a Hughes liquid crystal light valve

    Science.gov (United States)

    Chao, Tien-Hsin

    1989-01-01

    The discovery of an edge enhancement effect in using a Hughes CdS liquid crystal light valve (LCLV) is reported. An edge-enhanced version of the input writing image can be directly obtained by operating the LCLV at a lower bias frequency and bias voltage. Experimental conditions in which this edge enhancement effect can be optimized are described. Experimental results show that the SNR of the readout image using this technique is superior to that obtained using high-pass filtering. The repeatability of this effect is confirmed by obtaining an edge enhancement result using two different Hughes LCLVs. The applicability of this effect to improve discrimination capability in optical pattern recognition is addressed. The results show that the Hughes LCLV can be used in both continuous tone and edge-enhancing modes by simply adjusting its bias conditions.

  1. On the Hughes' model for pedestrian flow: The one-dimensional case

    KAUST Repository

    Di Francesco, Marco

    2011-02-01

    In this paper we investigate the mathematical theory of Hughes\\' model for the flow of pedestrians (cf. Hughes (2002) [17]), consisting of a non-linear conservation law for the density of pedestrians coupled with an eikonal equation for a potential modelling the common sense of the task. For such an approximated system we prove existence and uniqueness of entropy solutions (in one space dimension) in the sense of Kružkov (1970) [22], in which the boundary conditions are posed following the approach of Bardos et al. (1979) [7]. We use BV estimates on the density ρ and stability estimates on the potential Π in order to prove uniqueness. Furthermore, we analyze the evolution of characteristics for the original Hughes\\' model in one space dimension and study the behavior of simple solutions, in order to reproduce interesting phenomena related to the formation of shocks and rarefaction waves. The characteristic calculus is supported by numerical simulations. © 2010 Elsevier Inc.

  2. Real time optical edge enhancement using a Hughes liquid crystal light valve

    Science.gov (United States)

    Chao, Tien-Hsin

    1989-01-01

    The discovery of an edge enhancement effect in using a Hughes CdS liquid crystal light valve (LCLV) is reported. An edge-enhanced version of the input writing image can be directly obtained by operating the LCLV at a lower bias frequency and bias voltage. Experimental conditions in which this edge enhancement effect can be optimized are described. Experimental results show that the SNR of the readout image using this technique is superior to that obtained using high-pass filtering. The repeatability of this effect is confirmed by obtaining an edge enhancement result using two different Hughes LCLVs. The applicability of this effect to improve discrimination capability in optical pattern recognition is addressed. The results show that the Hughes LCLV can be used in both continuous tone and edge-enhancing modes by simply adjusting its bias conditions.

  3. 77 FR 33229 - Sport Fishing and Boating Partnership Council Charter

    Science.gov (United States)

    2012-06-05

    ... Office of the Secretary Sport Fishing and Boating Partnership Council Charter AGENCY: Office of the... ] consultation with the General Services Administration, the Secretary of the Interior has renewed the Sport... or programs to increase public awareness and support for the Sport Fish Restoration and Boating...

  4. 76 FR 75898 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2011-12-05

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council AGENCY: Fish and Wildlife... (Service), announce a public teleconference of the Sport Fishing and Boating Partnership Council (Council.... The Council represents the interests of the public and private sectors of the sport fishing,...

  5. Disentangling invasion processes in a dynamic shipping-boating network.

    Science.gov (United States)

    Lacoursière-Roussel, Anaïs; Bock, Dan G; Cristescu, Melania E; Guichard, Frédéric; Girard, Philippe; Legendre, Pierre; McKindsey, Christopher W

    2012-09-01

    The relative importance of multiple vectors to the initial establishment, spread and population dynamics of invasive species remains poorly understood. This study used molecular methods to clarify the roles of commercial shipping and recreational boating in the invasion by the cosmopolitan tunicate, Botryllus schlosseri. We evaluated (i) single vs. multiple introduction scenarios, (ii) the relative importance of shipping and boating to primary introductions, (iii) the interaction between these vectors for spread (i.e. the presence of a shipping-boating network) and (iv) the role of boating in determining population similarity. Tunicates were sampled from 26 populations along the Nova Scotia, Canada, coast that were exposed to either shipping (i.e. ports) or boating (i.e. marinas) activities. A total of 874 individuals (c. 30 per population) from five ports and 21 marinas was collected and analysed using both mitochondrial cytochrome c oxidase subunit I gene (COI) and 10 nuclear microsatellite markers. The geographical location of multiple hotspot populations indicates that multiple invasions have occurred in Nova Scotia. A loss of genetic diversity from port to marina populations suggests a stronger influence of ships than recreational boats on primary coastal introductions. Population genetic similarity analysis reveals a dependence of marina populations on those that had been previously established in ports. Empirical data on marina connectivity because of boating better explains patterns in population similarities than does natural spread. We conclude that frequent primary introductions arise by ships and that secondary spread occurs gradually thereafter around individual ports, facilitated by recreational boating.

  6. 78 FR 53156 - Sport Fishing and Boating Partnership Council; Teleconference

    Science.gov (United States)

    2013-08-28

    ... Fish and Wildlife Service Sport Fishing and Boating Partnership Council; Teleconference AGENCY: Fish... Wildlife Service (Service), announce a public teleconference of the Sport Fishing and Boating Partnership... . SUPPLEMENTARY INFORMATION: In accordance with the requirements of the Federal Advisory Committee Act, 5 U.S.C...

  7. Louisiana Marinas and Boat Launches, Geographic NAD83, LOSCO (2004) [marinas_LOSCO_2004

    Data.gov (United States)

    Louisiana Geographic Information Center — The dataset defines the location and supplemental information for marinas and boat launches in southern Louisiana. The boat launch database includes public and...

  8. Symposium Festschrift Hughes (Vernon W) to Celebrate his 70th birthday

    CERN Document Server

    1992-01-01

    The contents of this book are derived from a celebration of the 70th birthday of Vernon W Hughes. Professor Hughes' career has touched on several areas in modern physics ranging from precision measurements of the fundamental properties of atoms to measurements of spin structure functions of the proton via deep inelastic muon scattering at the world's highest energy fixed target machines. This observance of his 70th birthday brings together experimental and theoretical physicists who are leaders of the many fields in which he has made contributions.

  9. Automatic Boat Identification System for VIIRS Low Light Imaging Data

    Directory of Open Access Journals (Sweden)

    Christopher D. Elvidge

    2015-03-01

    Full Text Available The ability for satellite sensors to detect lit fishing boats has been known since the 1970s. However, the use of the observations has been limited by the lack of an automatic algorithm for reporting the location and brightness of offshore lighting features arising from boats. An examination of lit fishing boat features in Visible Infrared Imaging Radiometer Suite (VIIRS day/night band (DNB data indicates that the features are essentially spikes. We have developed a set of algorithms for automatic detection of spikes and characterization of the sharpness of spike features. A spike detection algorithm generates a list of candidate boat detections. A second algorithm measures the height of the spikes for the discard of ionospheric energetic particle detections and to rate boat detections as either strong or weak. A sharpness index is used to label boat detections that appear blurry due to the scattering of light by clouds. The candidate spikes are then filtered to remove features on land and gas flares. A validation study conducted using analyst selected boat detections found the automatic algorithm detected 99.3% of the reference pixel set. VIIRS boat detection data can provide fishery agencies with up-to-date information of fishing boat activity and changes in this activity in response to new regulations and enforcement regimes. The data can provide indications of illegal fishing activity in restricted areas and incursions across Exclusive Economic Zone (EEZ boundaries. VIIRS boat detections occur widely offshore from East and Southeast Asia, South America and several other regions.

  10. 77 FR 1975 - Union Pacific Railroad Company-Discontinuance of Service Exemption-in Pittsburg, Hughes, and...

    Science.gov (United States)

    2012-01-12

    ..., Hughes, and Seminole Counties, Okla. (the line). The line traverses United States Postal Service Zip... discontinue service over a portion of a line of railroad known as the Shawnee Branch Line, between milepost... in Hughes County, which makes the line 0.19 miles longer than the terminal mileposts would...

  11. Rivers and Hughes's Construction of Black Culture in White America——Textual Analysis of "The Negro Speaks of RAvers"

    Institute of Scientific and Technical Information of China (English)

    曾慧

    2009-01-01

    Langston Hughes's central purpose in writing is "to explain and illuminate the Negro condition in America". By means of textual analysis, this thesis is to discover how the images of rivers in "The Negro Speaks of Rivers" construct the black culture, to find Hughes's identity in America.

  12. Flight of the loon : solar-powered boating

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2006-04-01

    Details of the first solar-powered, zero-emission boat to venture across the Trent-Severn waterway were presented. Called the 'Loon', the boat is now being manufactured for environmentally-conscious boaters around the world. The seating arrangement, pontoon design, and propulsion system were all designed to minimize impacts on the ecosystem. A prototype boat was built and tested in the summer of 2005 to determine the viability of the solar-powered boat, and a family trip down the waterway was completed in August. Results of the trip encouraged the inventor to raise capital and a suitable production facility. After several months of development, the first production boat was completed with many improvements to the original prototype. An entrepreneur from Belize was the first person to place an order after he discovered that most commercially-available solar-powered boats were higher-priced and less capable than the Loon. High gas prices and the detrimental effects of fuel exhaust in lakes have caused many people to become sensitive to the issues surrounding fuel use and pleasure boats. It was concluded that a storefront has recently been opened north of Orillia in order to sell the solar-powered craft. 3 figs.

  13. IN MEMORIAM: Hugh P Kelly, 3 September 1931 - 29 June 1992

    Science.gov (United States)

    Hansen, Jørgen E.

    1993-01-01

    It is said that Racah was one of the few physicists who was able not only to read Hermann Weyl's book "The Theory of Groups and Quantum Mechanics" but also to understand enough to use it himself. Something similar applies to Hugh Kelly, who introduced the methods of Many-Body Perturbation Theory (MBPT), which was being developed by nuclear physicists like Keith Brueckner whom Hugh worked with as a post-doc, into atomic physics. Since atomic physics with its "known" forces is a perfect area in which to apply the methods of MBPT, it is clear that this would have happened sooner or later. Hugh Kelly's achievement is that it happened very early. Hugh's death this summer after a long battle with cancer is a great loss to atomic physics and to his many friends in the community. Hugh P Kelly got his PhD from the University of California at Berkeley in 1963 under the supervision of Kenneth Watson and in 1965 he was hired as assistant Professor at the University of Virginia. His appointment was to a large extent due to the support of M E Rose, also a nuclear physicist with interest in atoms as is clear from his book "Elementary Theory of Angular Momentum". Hugh remained at the University of Virginia for the rest of his life, over the years serving as Department Chairman, Faculty Dean and, during the last years, as University Provost, but throughout Hugh pursued his real passion which was Physics. It is a clear sign of his dedication that he is sole author on a large number of papers particularly of course in the early years when he alone was Atomic Theory in Charlottesville. Hugh contributed to many areas of atomic physics although early on photoionization became his favourite subject and the one where he made his main contribution: first for closed shell atoms, but later extending his techniques to open shell systems for which the normal MBPT techniques did not apply. Hugh had a good nose for finding projects that were of topical interest and many of his papers are

  14. 75 FR 24973 - United States v. Baker Hughes Inc., et al.

    Science.gov (United States)

    2010-05-06

    .... IV. Trade and Commerce A. Background 1. Overview of Drilling and Completion Process 11. Offshore... impose on each other's pricing. Post merger, Baker Hughes will likely find it profitable to raise the... transaction may present a profitable opportunity to remove one or two vessels from the Gulf, an opportunity...

  15. The Political Economy of Rhetorical Style: Hugh Blair's Response to the Civic-Commercial Dilemma

    Science.gov (United States)

    Longaker, Mark Garrett

    2008-01-01

    Recent scholarship treats Hugh Blair's "Lectures" on Rhetoric and Belles Lettres (1783) as an effort to endorse either the liberal or the civic political traditions in eighteenth-century Scotland. This essay questions this orthodoxy by reading the "Lectures", and in particular Blair's attention to considerations of rhetorical…

  16. Markov chain Monte Carlo approach to parameter estimation in the FitzHugh-Nagumo model

    DEFF Research Database (Denmark)

    Jensen, Anders Christian; Ditlevsen, Susanne; Kessler, Mathieu

    2012-01-01

    Excitability is observed in a variety of natural systems, such as neuronal dynamics, cardiovascular tissues, or climate dynamics. The stochastic FitzHugh-Nagumo model is a prominent example representing an excitable system. To validate the practical use of a model, the first step is to estimate m...

  17. Principles and Practices Fostering Inclusive Excellence: Lessons from the Howard Hughes Medical Institute's Capstone Institutions

    Science.gov (United States)

    DiBartolo, Patricia Marten; Gregg-Jolly, Leslie; Gross, Deborah; Manduca, Cathryn A.; Iverson, Ellen; Cooke, David B., III; Davis, Gregory K.; Davidson, Cameron; Hertz, Paul E.; Hibbard, Lisa; Ireland, Shubha K.; Mader, Catherine; Pai, Aditi; Raps, Shirley; Siwicki, Kathleen; Swartz, Jim E.

    2016-01-01

    Best-practices pedagogy in science, technology, engineering, and mathematics (STEM) aims for inclusive excellence that fosters student persistence. This paper describes principles of inclusivity across 11 primarily undergraduate institutions designated as Capstone Awardees in Howard Hughes Medical Institute's (HHMI) 2012 competition. The Capstones…

  18. The Political Economy of Rhetorical Style: Hugh Blair's Response to the Civic-Commercial Dilemma

    Science.gov (United States)

    Longaker, Mark Garrett

    2008-01-01

    Recent scholarship treats Hugh Blair's "Lectures" on Rhetoric and Belles Lettres (1783) as an effort to endorse either the liberal or the civic political traditions in eighteenth-century Scotland. This essay questions this orthodoxy by reading the "Lectures", and in particular Blair's attention to considerations of rhetorical style, against their…

  19. "Comments on Greenhow, Robelia, and Hughes": Expanding the New Literacies Conversation

    Science.gov (United States)

    Leu, Donald J.; O'Byrne, W. Ian; Zawilinski, Lisa; McVerry, J. Greg; Everett-Cacopardo, Heidi

    2009-01-01

    Using a popularized notion such as Web 2.0 limits research efforts by employing a binary construct, one initially prompted by commercial concerns. Instead, the authors of this article, commenting on Greenhow, Robelia, and Hughes (2009), suggest that continuous, not dichotomous, change in the technologies of literacy and learning defines the…

  20. Environmental Management of Human Waste Disposal for Recreational Boating Activities

    Science.gov (United States)

    Shafer; Yoon

    1998-01-01

    / A methodology to estimate the number of pump-out facilities and dump stations required to service human waste disposal for recreational power boating activities in Pennsylvania during the 1994 boating season is described. Study results suggest that a total of 39 additional pump-out stations and 13 dump stations may be required on seven major waterbodies: The Three Rivers Area, Lake Erie/Presque Isle Bay, Raystown Lake, the Susquehanna River, the Delaware River, Lake Wallenpaupack, and the Kinzua Reservoir. Suggestions for improving the methodology are provided. KEY WORDS: Human waste; Recreation; Power boating; Waste facilities; Waste disposal; Pennsylvania

  1. 76 FR 52263 - Special Local Regulation for Marine Events; Mattaponi Madness Drag Boat Race, Mattaponi River...

    Science.gov (United States)

    2011-08-22

    ... Madness Drag Boat Race, Mattaponi River, Wakema, VA AGENCY: Coast Guard, DHS. ACTION: Temporary Final rule. SUMMARY: The Coast Guard will establish special local regulations during the Mattaponi Madness Drag ] Boat... events titled the ``Mattaponi Madness Drag Boat Event.'' The power boat races will be held on the...

  2. Patrol Vessels «Condestable Zaragoza» Class, Patrol Boats V-class and Antisubmarine Boats LAS-class

    Directory of Open Access Journals (Sweden)

    Valentin Ruesga Herreros

    2016-09-01

    Full Text Available It’s consider information about the number of ships of the Spanish fleet, that not reflected in the available literature. It’s proved that the Spanish patrol vessels of «Condestable Zaragoza»-class and French auxiliary minesweepers «Fanfaron»-classare one the same ships. The conclusion is made based on comparisons of appearance and performance of ships. There was renovated list of patrol boats V-class, shows that their history can be divided into three main stages: the first, when the boats belonged to the Secretariat militarized protection, information about boats are extremely sketchy and incomplete, the second – their inclusion in the fleet, when the information about the service enough full, but almost previous history is not reflected, and only the third stage, when the change came a new generation of boats old boats, often with the same numbers, the story is full enough. An attempt to reconstruction of the biography of LAS-class boats, it is assumed that this former Soviet boat, put the Republicans during the Civil War.

  3. 78 FR 30723 - National Safe Boating Week, 2013

    Science.gov (United States)

    2013-05-22

    ... all passengers are wearing a life jacket. And to put an end to preventable accidents that claim too many lives every year, individuals should never operate a boat under the influence of drugs or alcohol...

  4. 76 FR 30495 - National Safe Boating Week, 2011

    Science.gov (United States)

    2011-05-25

    ... safety checks, and ensure each passenger wears a life jacket and all required safety equipment is on..., so limiting alcohol use while on or operating a boat can save lives. Each year for National Safe...

  5. Nets, Boats and Fishing in the Roman World

    DEFF Research Database (Denmark)

    Bekker-Nielsen, Tønnes

    2002-01-01

    Ithas been claimed that in Roman times, net fishing was a shore-based technology, but a study of literary sources and pictorial evidence, mainly mosaics, show that net fishing from boats was widespread throughout the first four centuries AD....

  6. Hawaii Small Boat Cost-Earnings Data: 2014

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data represent a cost-earnings study of the Hawaii small boat fishery in 2014. Data collected include fisher classification, vessel characteristics, levels of...

  7. Hawaii Small Boat Cost-Earnings Data: 1995-1996

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data represent a cost-earnings study of the Hawaii small boat fishery in 1995-1996. Data collected include fisher classification, vessel characteristics,...

  8. Hawaii Small Boat Cost-Earnings Data: 2007-2008

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data represent a cost-earnings study of the Hawaii small boat fishery in 2007-2008. Data collected include fisher classification, vessel characteristics,...

  9. Hugh E. Huxley: cambiando el paradigma de la contracción muscular, desde dentro. [Hugh E. Huxley: changing from inside the paradigm of muscle contraction].

    OpenAIRE

    Adolfo Araci

    2014-01-01

    Desde un punto de vista físico se puede entender la fibra muscular como un motor, es decir, un sistema capaz de transformar la energía química en energía mecánica, que se utiliza para realizar un trabajo. Por lo tanto, para entender cómo ocurre dicho proceso de transformación es necesario conocer la ultraestructura de la fibra muscular. Esta es, sin duda, la principal aportación al acervo científico del recientemente fallecido Hugh Emor Huxley (1924-2013). Huxley se graduó en Física en el Chr...

  10. Hugh E. Huxley: cambiando el paradigma de la contracción muscular, desde dentro. [Hugh E. Huxley: changing from inside the paradigm of muscle contraction].

    OpenAIRE

    Adolfo Araci

    2014-01-01

    Desde un punto de vista físico se puede entender la fibra muscular como un motor, es decir, un sistema capaz de transformar la energía química en energía mecánica, que se utiliza para realizar un trabajo. Por lo tanto, para entender cómo ocurre dicho proceso de transformación es necesario conocer la ultraestructura de la fibra muscular. Esta es, sin duda, la principal aportación al acervo científico del recientemente fallecido Hugh Emor Huxley (1924-2013). Huxley se graduó en Física en el Chr...

  11. Estimating Orientation of Flying Fruit Flies.

    Directory of Open Access Journals (Sweden)

    Xi En Cheng

    Full Text Available The recently growing interest in studying flight behaviours of fruit flies, Drosophila melanogaster, has highlighted the need for developing tools that acquire quantitative motion data. Despite recent advance of video tracking systems, acquiring a flying fly's orientation remains a challenge for these tools. In this paper, we present a novel method for estimating individual flying fly's orientation using image cues. Thanks to the line reconstruction algorithm in computer vision field, this work can thereby focus on the practical detail of implementation and evaluation of the orientation estimation algorithm. The orientation estimation algorithm can be incorporated into tracking algorithms. We rigorously evaluated the effectiveness and accuracy of the proposed algorithm by running experiments both on simulation data and on real-world data. This work complements methods for studying the fruit fly's flight behaviours in a three-dimensional environment.

  12. Flying insects and Campylobacter

    DEFF Research Database (Denmark)

    Hald, Birthe; Sommer, Helle Mølgaard; Skovgård, Henrik

    Campylobacter in flies Flies of the Muscidae family forage on all kind of faeces – various fly species have different preferences. M domestica prefer pigs, horses and cattle faeces, animals which are all known to frequently excrete Campylobacter. As a result, the insects pick up pathogenic micro...... organisms, which may collect on their bodies or survive passage through the fly gut. Campylobacter and other pathogens are then easily transferred to other surfaces, for instance peoples food – or to broiler houses where they may be swallowed by chickens or contaminate the environment. On a large material...... of several species of flies collected outside broiler houses, merely ~1% of the flies were found Campylobacter positive. However, the prevalence varied considerably with fly species, time of the year, and availability of Campylobacter sources. Influx of flies to broiler houses As the influx of flies...

  13. Flying insects and Campylobacter

    DEFF Research Database (Denmark)

    Hald, Birthe; Sommer, Helle Mølgaard; Skovgård, Henrik

    to broiler houses may be counted in thousands per broiler rotation during summer periods, even a low prevalence of Campylobacter positive flies constitute a risk of introduction of Campylobacter to the chickens. M. domestica – the house fly is the most important vector fly for Campylobacter transmission...... organisms, which may collect on their bodies or survive passage through the fly gut. Campylobacter and other pathogens are then easily transferred to other surfaces, for instance peoples food – or to broiler houses where they may be swallowed by chickens or contaminate the environment. On a large material...... of several species of flies collected outside broiler houses, merely ~1% of the flies were found Campylobacter positive. However, the prevalence varied considerably with fly species, time of the year, and availability of Campylobacter sources. Influx of flies to broiler houses As the influx of flies...

  14. Fitz-Hugh-Curtis syndrome: abdominal pain in women of 26 years old Síndrome de Fitz-Hugh-Curtis: dolor abdominal en mujer de 26 años

    OpenAIRE

    Liseth Rivero-Sánchez; Elsa María López-Soriano; Luisa Guarner-Aguilar

    2011-01-01

    Fitz-Hugh-Curtis syndrome is an inflammation of the liver capsule as a complication of pelvic inflammatory disease, whose most common etiologic agent is the C. trachomatis. The acute phase of the Fitz-Hugh-Curtis syndrome may present itself with pain in right upper abdomen, commonly confused with other hepatobiliary and gastrointestinal tract diseases. Definitive diagnosis is now possible with non-invasive techniques such as ultrasound, computed tomography, as well as techniques to isolate th...

  15. Numerical bifurcation analysis of two coupled FitzHugh-Nagumo oscillators

    CERN Document Server

    Hoff, Anderson; Manchein, Cesar; Albuquerque, Holokx A

    2015-01-01

    The behavior of neurons can be modeled by the FitzHugh-Nagumo oscillator model, consisting of two nonlinear differential equations, which simulates the behavior of nerve impulse conduction through the neuronal membrane. In this work, we numerically study the dynamical behavior of two coupled FitzHugh-Nagumo oscillators. We consider unidirectional and bidirectional couplings, for which Lyapunov and isoperiodic diagrams were constructed calculating the Lyapunov exponents and the number of the local maxima of a variable in one period interval of the time-series, respectively. By numerical continuation method the bifurcation curves are also obtained for both couplings. The dynamics of the networks here investigated are presented in terms of the variation between the coupling strength of the oscillators and other parameters of the system. For the network of two oscillators unidirectionally coupled, the results show the existence of Arnold tongues, self-organized sequentially in a branch of a Stern-Brocot tree and ...

  16. The 2016 Hughes Lecture: What's new in maternal morbidity and mortality?

    Science.gov (United States)

    Arendt, K W

    2016-05-01

    Each year, the Board of Directors of the Society for Obstetric Anesthesia and Perinatology selects an individual to review a given year's published obstetric anesthesiology literature. This individual then produces a syllabus of the year's most influential publications, delivers the Ostheimer Lecture at the Society's annual meeting, the Hughes Lecture at the following year's Sol Shnider meeting, and writes corresponding review articles. This 2016 Hughes Lecture review article focuses specifically on the 2014 publications that relate to maternal morbidity and mortality. It begins by discussing the 2014 research that was published on severe maternal morbidity and maternal mortality in developed countries. This is followed by a discussion of specific coexisting diseases and specific causes of severe maternal mortality. The review ends with a discussion of worldwide maternal mortality and the 2014 publications that examined the successes and the shortfalls in the work to make childbirth safe for women throughout the entire world.

  17. Two-frequency self-oscillations in a FitzHugh-Nagumo neural network

    Science.gov (United States)

    Glyzin, S. D.; Kolesov, A. Yu.; Rozov, N. Kh.

    2017-01-01

    A new mathematical model of a one-dimensional array of FitzHugh-Nagumo neurons with resistive-inductive coupling between neighboring elements is proposed. The model relies on a chain of diffusively coupled three-dimensional systems of ordinary differential equations. It is shown that any finite number of coexisting stable invariant two-dimensional tori can be obtained in this chain by suitably increasing the number of its elements.

  18. Selected results from LLNL-Hughes RAR for West Coast Scotland Experiment 1991

    Energy Technology Data Exchange (ETDEWEB)

    Lehman, S K; Johnston, B; Twogood, R; Wieting, M; Yorkey, T; Robey, H [Lawrence Livermore National Lab., CA (United States); Whelan, D; Nagele, R [Hughes Aircraft Co., Los Angeles, CA (United States)

    1993-01-05

    The joint US -- UK 1991 West Coast Scotland Experiment (WCSEX) was held in two locations. From July 5 to 12, 1991, in Upper Loch Linnhe, and from July 18 to July 26, 1991, in the Sound of Sleat. The LLNL-Hughes team fielded a fully polarimetric X-band hill-side real aperture radar to collect internal wave wake data. We present here a sample data set of the best radar runs.

  19. Symmetric bursting behaviors in the generalized FitzHugh-Nagumo model.

    Science.gov (United States)

    Abbasian, A H; Fallah, H; Razvan, M R

    2013-08-01

    In the current paper, we have investigated the generalized FitzHugh-Nagumo model. We have shown that symmetric bursting behaviors of different types could be observed in this model with an appropriate recovery term. A modified version of this system is used to construct bursting activities. Furthermore, we have shown some numerical examples of delayed Hopf bifurcation and canard phenomenon in the symmetric bursting of super-Hopf/homoclinic type near its super-Hopf and homoclinic bifurcations, respectively.

  20. Young CAS biologist gets five-year grant from Howard Hughes Medical Institute

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Dr. TANG Chun, an outstanding young biologist from the CAS Wuhan Institute of Physics and Mathematics (WIPM) was announced in January 2012 to have won the first International Early Career Award from Howard Hughes Medical Institute with a five-year grant totaling up to 650,000 US dollars. Dr. Tang is an expert in using novel nuclear magnetic resonance methods to study the behavior and function of proteins,

  1. 耦合的Fitz-Hugh-Nagumo模型的初边值问题

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    首先研究了具有耦合的 Fitz-Hugh-Nagumo 模型初值问题的渐近性. 其次,所对应的平衡态方程解的基本性态也将被讨论. 最后, 该模型的初边值问题古典解的最大吸引子的存在性将首次被证明.

  2. The Hughes Court and Radical Dissent: The Case of Dirk De Jonge and Angelo Herndon

    OpenAIRE

    Tushnet, Mark V.

    2012-01-01

    Scattered Supreme Court decisions in the early twentieth century dealt with the Constitution’s protection of freedom of speech. Radical dissent over United States participation in World War I and the nation’s intervention against the Bolshevik revolution in Russia led the Court to its first sustained engagement with free speech cases. By the time Chief Justice Hughes took the center chair, the national government largely had abandoned its pursuit of radical dissenters, some of whom played la...

  3. Percutaneous transhepatic venous embolization of pulmonary artery aneurysm in Hughes-Stovin syndrome

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Kyung Ah; Kim, Man Deuk; Oh, Do Yun; Park, Pil Won [Bundang CHA General Hospital, Pochon CHA University, Seongnam (Korea, Republic of)

    2007-08-15

    Hughes-Stovin syndrome is an extremely rare entity. We present a case of a 42-year-old man, who developed deep vein and inferior vena cava (IVC) thrombosis, repeated internal bleeding and pulmonary artery aneurysms (PAAs). The patient presented with massive hemoptysis and with PAAs of a 2.5 cm maximum diameter. We describe the successful percutaneous transhepatic venous embolization of the PAAs due to occluded common vascular pathways to the pulmonary artery.

  4. Biofouling of leisure boats as a source of metal pollution.

    Science.gov (United States)

    Bighiu, Maria Alexandra; Eriksson-Wiklund, Ann-Kristin; Eklund, Britta

    2017-01-01

    The release of harmful metals from antifouling paints to water bodies is a well-known problem. In this study, we measured both the amount of biofouling growth on leisure boats during one season as well as the concentration of metals accumulated by the biofouling matrix. Furthermore, the efficiency of antifouling paints and mechanical boat cleaning as well as the effect of hull colour on biofouling were evaluated. Unlike paint residues, biofouling waste has never been regarded as a source of metal contamination and has previously been neglected in the scientific literature. Our results revealed that the biofouling waste contained very high concentrations of metals, up to 28,000 mg copper/kg dw and 171,000 mg zinc/kg dw, which exceeds the guidance values for least sensitive land use in Sweden by factors of 140 and 340, respectively. This observation is important because the contaminated biofouling waste is commonly disposed of in boatyard soils at the end of each season, thus increasing the levels of metal pollution. Moreover, there was no significant difference in the amount of biofouling if the boats were coated with copper or zinc containing paints or no paint at all, indicating that biocide paints might not be necessary in low-salinity areas such as the Stockholm archipelago. For boats that were not painted at all during the season, those washed on boat washers (mechanically) had on average half of the amount of biofouling compared to boats that were not cleaned mechanically. The results of the study indicate the importance of proper management of biofouling waste as well as the use of more environmentally friendly removal methods for biofouling such as boat washers.

  5. A política de Hugh Dalton e o Bloqueio Económico (1940-1942)

    OpenAIRE

    Mariana Castro

    2015-01-01

    The World War II was a scenery of conflict and protagonists. Hugh Dalton was Minister of Economics of War between 1940 and 1942 in England. Highlighted by the measure in economic blockade the belligerents and neutral countries, proposing the control of smuggling through the prohibition of exports and imports with the German enemy, in other words ‘dry internally and externally “to weaken. This essay focuses on Hugh Dalton policy, leaving few clues and suggestions for further study ...

  6. On Naturalism in Stephen Crane’s The Open Boat

    Institute of Scientific and Technical Information of China (English)

    WANG Xiu-hong; CHEN Bei-bei

    2014-01-01

    Stephen Crane is one of the greatest figures in the history of American literature and his novella The Open Boat is wide-ly known by people all over the world as a representative work of Naturalism. This paper aims at exploring Naturalism in Stephen Crane’s The Open Boat, which will guide the readers to understand American Naturalism accurately and thoroughly. It firstly in-troduces the author and his novel The Open Boat. Secondly, it progressively dissects Naturalism. It not only analyses the general characteristics of Naturalism with details in The Open Boat, but also interprets the distinguishing features of American Naturalism so that readers can better understand the features of American Naturalism. Through textual perusal, it further studies the unique characteristics of Stephen Crane’s Naturalism and lays particular emphasis on Crane’s special concern on the awakening of hu-manity. It is hoped that this thesis can help readers get an in-depth comprehension of Naturalism and gain some inspiration from The Open Boat.

  7. The Porpoising Characteristics of a Planing Surface Representing the Forebody of a Flying-Boat Hull

    Science.gov (United States)

    Benson, James M.

    1942-01-01

    Porpoising characteristics were observed on V-body fitted with tail surfaces for different combinations of load, speed, moment of inertia, location of pivot, elevator setting, and tail area. A critical trim was found which was unaltered by elevator setting or tail area. Critical trim was lowered by moving pivot either forward or down or increasing radius or gyration. Increase in mass and moment of inertia increased amplitude of oscillations. Complete results are tabulated and shown graphically.

  8. Self-propulsion of a metallic superoleophobic micro-boat.

    Science.gov (United States)

    Musin, Albina; Grynyov, Roman; Frenkel, Mark; Bormashenko, Edward

    2016-10-01

    The self-propulsion of a heavy, superoleophobic, metallic micro-boat carrying a droplet of various aqueous alcohol solutions as a fuel tank is reported. The micro-boat is driven by the solutocapillary Marangoni flow. The jump in the surface tension owing to the condensation of alcohols on the water surface was established experimentally. Maximal velocities of the self-propulsion were registered as high as 0.05m/s. The maximal velocity of the center mass of the boat correlates with the maximal change in the surface tension, due to the condensation of alcohols. The mechanism of the self-locomotion is discussed. The phenomenological dynamic model describing the self-propulsion is reported.

  9. RESEARCH ON WAKE ENERGY RECOVERY TECHNOLOGIES FOR A FISHING BOAT

    Institute of Scientific and Technical Information of China (English)

    MA Cheng; QIAN Zheng-fang; DU Du; ZHANG Xu

    2005-01-01

    Wake energy recovery of a ship's propeller is an important research subject in ship propulsion field. Based on the study on the mechanism analysis and computation method of the hydrodynamic performance of the propeller-rudder-rudder bubble combination, computer simulation system was built and then used to design and simulate four kinds of rudder bubbles, then the model comparison tests with the original rudder was carried out and the sensible factors influencing the energy-saving effects of rudder bubble was also analyzed. On this basis, a further optimized design of the rudder bubble for a fishing boat was put forward, and comparison test on a real boat was then carried out. It is shown that the optimized rudder bubble design can effectively recover wake energy of ships and the rudder bubble installation features a simple operation and high cost-effectiveness, and the energy-saving effect of real boat test achieves 5.1%.

  10. An Empirical Analysis of Life Jacket Effectiveness in Recreational Boating.

    Science.gov (United States)

    Viauroux, Christelle; Gungor, Ali

    2016-02-01

    This article gives a measure of life jacket (LJ) effectiveness in U.S. recreational boating. Using the U.S. Coast Guard's Boating Accident Report Database from 2008 to 2011, we find that LJ wear is one of the most important determinants influencing the number of recreational boating fatalities, together with the number of vessels involved, and the type and engine of the vessel(s). We estimate a decrease in the number of deceased per vessel of about 80% when the operator wears their LJs compared to when they do not. The odds of dying are 86% higher than average if the accident involves a canoe or kayak, but 80% lower than average when more than one vessel is involved in the accident and 34% lower than average when the operator involved in the accident has more than 100 hours of boating experience. Interestingly, we find that LJ effectiveness decreases significantly as the length of the boat increases and decreases slightly as water temperature increases. However, it increases slightly as the operator's age increases. We find that between 2008 and 2011, an LJ regulation that requires all operators to wear their LJs-representing a 20% increase in wear rate-would have saved 1,721 (out of 3,047) boaters or 1,234 out of 2,185 drowning victims. The same policy restricted to boats 16-30 feet in length would have saved approximately 778 victims. Finally, we find that such a policy would reduce the percentage of drowning victims compared to other causes of death. © 2015 Society for Risk Analysis.

  11. Summary on China boat import and export in 2005

    Institute of Scientific and Technical Information of China (English)

    Zhu Huaixin

    2006-01-01

    @@ According to the latest statistics by the Customs, China exported inflatable recreation/ sports boats in 4 types (as the Customs codes 89039900, 89031000, 89039200& 89039100) increased in large numbers up to 137634 and totaled 63.4096 million US dollars, which increased 40.8% than 2004 and took 1.344% of the total ship export sum of 2005.Besides, it also imported 1162 various boats mounting to 18.108 million US dollars,this increased 80.5% than 2004 and took 3.69%of the total ship import value.

  12. 78 FR 18617 - Recreational Boating Safety Projects, Programs and Activities Funded Under Provisions of the...

    Science.gov (United States)

    2013-03-27

    ... Responsibly!'', Life Jacket Wear, Vessel Safety Check Program (VSC), Boating Safety Education Courses... wide spectrum of boating safety related topics and is dedicated to reducing loss of life, injuries, and...

  13. 75 FR 78725 - Recreational Boating Safety Projects, Programs and Activities Funded Under Provisions of the...

    Science.gov (United States)

    2010-12-16

    ... Responsibly!'', Life Jacket Wear, Vessel Safety Check Program (VSC), Boating Safety Education Courses... wide spectrum of boating safety related topics and is dedicated to reducing loss of life, injuries, and...

  14. A study of the sewn-plank boats of Goa, India

    Digital Repository Service at National Institute of Oceanography (India)

    Shaikh, Z.A.; Tripati, S.; Shinde, V.

    - 25. Gould, R., 2000, Archaeology and the Social History of Ships. Cambridge. Greenhill, B., 1971, Boats and Boatmen of Pakistan. Newton Abbot. Greenhill, B., 1995, The Archaeology of Boats and Ships. London. Hornell, J., 1920, The Origin...

  15. Fly ash carbon passivation

    Science.gov (United States)

    La Count, Robert B; Baltrus, John P; Kern, Douglas G

    2013-05-14

    A thermal method to passivate the carbon and/or other components in fly ash significantly decreases adsorption. The passivated carbon remains in the fly ash. Heating the fly ash to about 500 and 800 degrees C. under inert gas conditions sharply decreases the amount of surfactant adsorbed by the fly ash recovered after thermal treatment despite the fact that the carbon content remains in the fly ash. Using oxygen and inert gas mixtures, the present invention shows that a thermal treatment to about 500 degrees C. also sharply decreases the surfactant adsorption of the recovered fly ash even though most of the carbon remains intact. Also, thermal treatment to about 800 degrees C. under these same oxidative conditions shows a sharp decrease in surfactant adsorption of the recovered fly ash due to the fact that the carbon has been removed. This experiment simulates the various "carbon burnout" methods and is not a claim in this method. The present invention provides a thermal method of deactivating high carbon fly ash toward adsorption of AEAs while retaining the fly ash carbon. The fly ash can be used, for example, as a partial Portland cement replacement in air-entrained concrete, in conductive and other concretes, and for other applications.

  16. 19 CFR 148.32 - Vehicles, aircraft, boats, teams and saddle horses taken abroad.

    Science.gov (United States)

    2010-04-01

    ... 19 Customs Duties 2 2010-04-01 2010-04-01 false Vehicles, aircraft, boats, teams and saddle horses... for Returning Residents § 148.32 Vehicles, aircraft, boats, teams and saddle horses taken abroad. (a) Admission free of duty. Automobiles and other vehicles, aircraft, boats, teams and saddle horses,...

  17. 19 CFR 12.85 - Coast Guard boat and associated equipment safety standards.

    Science.gov (United States)

    2010-04-01

    ... subpart B, 33 CFR part 181. (2) A boat hull subject to subpart C, 33 CFR part 181 will have affixed to it... identification number, if affixed, or date of manufacture if hull identification number not affixed, of any boat... 19 Customs Duties 1 2010-04-01 2010-04-01 false Coast Guard boat and associated equipment safety...

  18. 76 FR 27284 - Special Local Regulation; Partnership in Education, Dragon Boat Race; Maumee River, Toledo, OH

    Science.gov (United States)

    2011-05-11

    ..., Dragon Boat Race; Maumee River, Toledo, OH AGENCY: Coast Guard, DHS. ACTION: Notice of proposed... during the Dragon Boat Races which take place during the third or fourth weekend in July each year. This... from other vessel traffic. The Captain of the Port Detroit has determined dragon boat races in...

  19. 77 FR 55436 - Special Local Regulation; Partnership in Education, Dragon Boat Race; Maumee River, Toledo, OH

    Science.gov (United States)

    2012-09-10

    ..., Dragon Boat Race; Maumee River, Toledo, OH AGENCY: Coast Guard, DHS. ACTION: Notice of proposed... River during the annual Dragon Boat Races. This special local regulated area is necessary to protect... Regulation; Partnership in Education Dragon Boat Race, Maumee River Toledo, OH in the Federal...

  20. 78 FR 57063 - Special Local Regulations; Jacksonville Dragon Boat Festival; St. Johns River; Jacksonville, FL

    Science.gov (United States)

    2013-09-17

    ... SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulations; Jacksonville Dragon Boat... Jacksonville, Florida during the Jacksonville Dragon Boat Festival, a series of paddle boat races. The event is... is to ensure safety of life on navigable waters of the United States during the Jacksonville...

  1. 7 CFR 58.317 - Bulk butter trucks, boats, texturizers, and packers.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Bulk butter trucks, boats, texturizers, and packers... and Grading Service 1 Equipment and Utensils § 58.317 Bulk butter trucks, boats, texturizers, and packers. Bulk butter trucks, boats, texturizers, and packers shall be constructed of aluminum,...

  2. 75 FR 17754 - Certificate of Alternative Compliance for the Lift Boat GARY CHIASSON ELEVATOR

    Science.gov (United States)

    2010-04-07

    ... SECURITY Coast Guard Certificate of Alternative Compliance for the Lift Boat GARY CHIASSON ELEVATOR AGENCY... Compliance was issued for the lift boat GARY CHIASSON ELEVATOR as required by 33 U.S.C. 1605(c) and 33 CFR 81... Regulations, Parts 81 and 89, has been issued for the lift boat GARY CHIASSON ELEVATOR. The Certificate...

  3. 75 FR 22150 - Certificate of Alternative Compliance for the Ferry Boat CHARLEVOIX

    Science.gov (United States)

    2010-04-27

    ... SECURITY Coast Guard Certificate of Alternative Compliance for the Ferry Boat CHARLEVOIX AGENCY: Coast... Compliance was issued for the ferry boat CHARLEVOIX as required by 33 U.S.C. 1605(c) and 33 CFR 81.18. DATES... Regulations, Parts 81 and 89, has been issued for the ferry boat CHARLEVOIX. Full compliance with 72 COLREGS...

  4. A "Queen of Hearts" trial of organ markets: why Scheper-Hughes's objections to markets in human organs fail.

    Science.gov (United States)

    Taylor, J S

    2007-04-01

    Nancy Scheper-Hughes is one of the most prominent critics of markets in human organs. Unfortunately, Scheper-Hughes rejects the view that markets should be used to solve the current (and chronic) shortage of transplant organs without engaging with the arguments in favour of them. Scheper-Hughes's rejection of such markets is of especial concern, given her influence over their future, for she holds, among other positions, the status of an adviser to the World Health Organization (Geneva) on issues related to global transplantation. Given her influence, it is important that Scheper-Hughes's moral condemnation of markets in human organs be subject to critical assessment. Such critical assessment, however, has not generally been forthcoming. A careful examination of Scheper-Hughes's anti-market stance shows that it is based on serious mischaracterisations of both the pro-market position and the medical and economic realities that underlie it. In this paper, the author will expose and correct these mischaracterisations and, in so doing, show that her objections to markets in human organs are unfounded.

  5. HARP model rotor test at the DNW. [Hughes Advanced Rotor Program

    Science.gov (United States)

    Dawson, Seth; Jordan, David; Smith, Charles; Ekins, James; Silverthorn, Lou

    1989-01-01

    Data from a test of a dynamically scaled model of the Hughes Advanced Rotor Program (HARP) bearingless model main rotor and 369K tail rotor are reported. The history of the HARP program and its goals are reviewed, and the main and tail rotor models are described. The test facilities and instrumentation are described, and wind tunnel test data are presented on hover, forward flight performance, and blade-vortex interaction. Performance data, acoustic data, and dynamic data from near field/far field and shear layer studies are presented.

  6. The spike timing precision of FitzHugh-Nagumo neuron network coupled by gap junctions

    Institute of Scientific and Technical Information of China (English)

    Zhang Su-Hua; Zhan Yong; Yu Hui; An Hai-Long; Zhao Tong-Jun

    2006-01-01

    It has been proved recently that the spike timing can play an important role in information transmission, so in this paper we develop a network with N-unit FitzHugh-Nagumo neurons coupled by gap junctions and discuss the dependence of the spike timing precision on synaptic coupling strength, the noise intensity and the size of the neuron ensemble. The calculated results show that the spike timing precision decreases as the noise intensity increases; and the ensemble spike timing precision increases with coupling strength increasing. The electric synapse coupling has a more important effect on the spike timing precision than the chemical synapse coupling.

  7. Markov chain Monte Carlo approach to parameter estimation in the FitzHugh-Nagumo model.

    Science.gov (United States)

    Jensen, Anders Chr; Ditlevsen, Susanne; Kessler, Mathieu; Papaspiliopoulos, Omiros

    2012-10-01

    Excitability is observed in a variety of natural systems, such as neuronal dynamics, cardiovascular tissues, or climate dynamics. The stochastic FitzHugh-Nagumo model is a prominent example representing an excitable system. To validate the practical use of a model, the first step is to estimate model parameters from experimental data. This is not an easy task because of the inherent nonlinearity necessary to produce the excitable dynamics, and because the two coordinates of the model are moving on different time scales. Here we propose a Bayesian framework for parameter estimation, which can handle multidimensional nonlinear diffusions with large time scale separation. The estimation method is illustrated on simulated data.

  8. Synchronization in heterogeneous FitzHugh-Nagumo networks with hierarchical architecture

    Science.gov (United States)

    Plotnikov, S. A.; Lehnert, J.; Fradkov, A. L.; Schöll, E.

    2016-07-01

    We study synchronization in heterogeneous FitzHugh-Nagumo networks. It is well known that heterogeneities in the nodes hinder synchronization when becoming too large. Here we develop a controller to counteract the impact of these heterogeneities. We first analyze the stability of the equilibrium point in a ring network of heterogeneous nodes. We then derive a sufficient condition for synchronization in the absence of control. Based on these results we derive the controller providing synchronization for parameter values where synchronization without control is absent. We demonstrate our results in networks with different topologies. Particular attention is given to hierarchical (fractal) topologies, which are relevant for the architecture of the brain.

  9. Hub-enhanced noise-sustained synchronization of an externally forced FitzHugh-Nagumo ring

    Science.gov (United States)

    Sánchez, Alejandro D.; Izús, Gonzalo G.; dell'Erba, Matías G.; Deza, Roberto R.

    2017-02-01

    A ring of FitzHugh-Nagumo units with antiphase coupling between their activator fields and submitted to a adiabatic harmonic subthreshold signal, is in turn globally coupled in electrical mode with the activator field of a hub. Noise sustained synchronization of neural activity with the signal is numerically observed, and theoretically characterized. The different dynamical regimes are elucidated using the concept of nonequilibrium potential, and the hub is found to promote network synchronization. The minimum noise intensities triggering the activation and synchronization processes are estimated in the framework of a three-neuron model.

  10. Synchronization and associative memory of FitzHugh-Nagumo neuronal networks with randomly distributed time delays

    Energy Technology Data Exchange (ETDEWEB)

    Peng, J H; Wu, Y J [School of Information Science and Engineering, East China University of Science and Technology, Shanghai 200237 (China); Yu, H J [Department of Mechanics, Shanghai Jiao Tong University, Shanghai 200240 (China)], E-mail: jhpeng@ecust.edu.cn

    2008-02-15

    Synchronization and associative memory in a neural network composed of the widely discussed FitzHugh-Nagumo neurons is investigated in this paper. Based on the reality of the microscopic biological structure in the neural system, the couplings among those neurons are accompanied with randomly distributed time delays which models the times needed for pulses propagating on the axons from the presynaptic neurons to the postsynaptic neurons. The memory is represented in the spatiotemporal firing pattern of the neurons, and the memory retrieval is accomplished with the fluctuations of the noise in the system.

  11. 76 FR 14037 - National Boating Safety Advisory Council

    Science.gov (United States)

    2011-03-15

    ...) Liaison's report. (g) Life Jacket Working Group report. (3) Presentation on Boat Rental Education Kit. (4) Presentation on non-USCG Approved Life Jackets. (5) Presentation on Progress Made on Recommendation Regarding the Development of New Life Jacket Standards and Approval Processes for Life Jackets. (6) Discussion...

  12. Bow and stern waves triggered by the Moon's shadow boat

    National Research Council Canada - National Science Library

    J. Y. Liu; Y. Y. Sun; Y. Kakinami; C. H. Chen; C. H. Lin; H. F. Tsai

    2011-01-01

    ...) derived from ground-based GPS receivers in Taiwan and Japan. We not only find the feature of the predicted bow wave but also the stern wave on the equator side of the eclipse path, as well as the stern wake right behind the Moon's shadow boat...

  13. REORIENTATION--"THE OPEN BOAT." LITERATURE CURRICULUM III, TEACHER VERSION.

    Science.gov (United States)

    CRANE, STEPHEN; KITZHABER, ALBERT R.

    IN THIS TEACHER'S GUIDE FOR NINTH-GRADE ENGLISH CLASSES, AN APPROACH TO THE ANALYSIS OF STEPHEN CRANE'S "THE OPEN BOAT" WAS OUTLINED. THE APPROACH EMPHASIZED DEVELOPMENT OF STUDENT UNDERSTANDING OF THE STORY'S SUBJECT, FORM, AND POINT-OF-VIEW. THIS APPROACH INCORPORATED THE PRINCIPLES OF ANALYSIS OF LITERATURE THAT WERE INTRODUCED IN THE…

  14. REORIENTATION--"THE OPEN BOAT." LITERATURE CURRICULUM III, STUDENT VERSION.

    Science.gov (United States)

    CRANE, STEPHEN; KITZHABER, ALBERT R.

    A SHORT STORY, STEPHEN CRANE'S "THE OPEN BOAT," AND SUGGESTIONS FOR STUDY OF THE STORY WERE PRESENTED IN A STUDY GUIDE, ONE OF A SERIES OF CURRICULUM GUIDES PRODUCED FOR USE BY A NINTH-GRADE ENGLISH CLASS. ONE STUDY TECHNIQUE PRESENTED, CALLED "THE EXPLODED DIAGRAM," INVOLVED SEPARATING THE STORY'S CONTENT INTO SUCH SINGLE…

  15. Mother goddesses with boat motifs on stone sculptures from Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Kerkar, R.; Gaur, A.S.

    in temples made of laterite dressed stone blocks, which might have been a tradition of the post-Kadamba period. At Savarde, a few architectural members lying Fig.4. Fragmented sculpture with boat motif from Guleli in the vicinity suggest that a temple...

  16. The Team Boat Exercise: Enhancing Team Communication Midsemester

    Science.gov (United States)

    Cox, Pamela L.; Friedman, Barry A.

    2009-01-01

    This paper discusses the Team Boat Exercise, which was developed to provide students with a mechanism for addressing team problems and enhancing team communication midsemester. The inspiration for the exercise came from a video by Prentice Hall, Inc. (2001). Part III of the video, entitled "Corporate Coaching," shows senior staff members from the…

  17. The Team Boat Exercise: Enhancing Team Communication Midsemester

    Science.gov (United States)

    Cox, Pamela L.; Friedman, Barry A.

    2009-01-01

    This paper discusses the Team Boat Exercise, which was developed to provide students with a mechanism for addressing team problems and enhancing team communication midsemester. The inspiration for the exercise came from a video by Prentice Hall, Inc. (2001). Part III of the video, entitled "Corporate Coaching," shows senior staff members from the…

  18. 78 FR 61866 - Sport Fishing and Boating Partnership Council

    Science.gov (United States)

    2013-10-04

    ... American tribes, aquatic resource outreach and education, and tourism. Background information on the... tourism; Issues regarding the Boating Infrastructure Grant Program and Clean Vessel Act Grant Program... and Outdoor Recreation; Other miscellaneous Council business. The final agenda will be posted on...

  19. 77 FR 17084 - National Boating Safety Advisory Council

    Science.gov (United States)

    2012-03-23

    ... Safety Strategic Planning Subcommittee will meet on Friday, April 13, 2012 from 1:30 p.m. to 3:45 p.m... comment. Saturday, April 14, 2012 (1) Receipt and Discussion of the Strategic Planning, Boats & Associated... meetings may conclude early if NBSAC has completed all business. All written materials, comments,...

  20. 50 CFR 80.24 - Recreational boating access facilities.

    Science.gov (United States)

    2010-10-01

    ... INTERIOR (CONTINUED) FINANCIAL ASSISTANCE-WILDLIFE SPORT FISH RESTORATION PROGRAM ADMINISTRATIVE REQUIREMENTS, PITTMAN-ROBERTSON WILDLIFE RESTORATION AND DINGELL-JOHNSON SPORT FISH RESTORATION ACTS § 80.24... the Dingell-Johnson Sport Fish Restoration Act for recreational boating access facilities. However, a...

  1. 空间离散Fitz-Hugh-Nagumo方程和双稳反应扩散方程组的渐近行为%Asymptotic Behavioui of Spatial Discretized Fitz-Hugh-Nagumo Equations and Bistable Reaction Diffusion Equations

    Institute of Scientific and Technical Information of China (English)

    黄建华; 路钢

    2000-01-01

    In this paper, we discuss the asymptotic behaviour of spatial disretization of Fitz-Hugh-Nagumo equations and bistable reaction diffusion equations with Neumamn boundary conditions, and the invariant regions, absorbing sets and global attractors are obtained and the estimation of Hausdorff dimension is given.%本文利用扰动方法,研究了Fitz-Hugh-Nagumo方程和双稳反应扩散方程在Neuman边值条件下空间离散后的渐近行为,证明了两个格微分方程组的不变区域、吸引集和整体吸引子的存在性,并给出了离散Fitz-Hugh-Nagumo方程的整体吸引子的Hausdorff维数估计.

  2. Formation Flying Concept Issues

    Directory of Open Access Journals (Sweden)

    M. V. Palkin

    2015-01-01

    Full Text Available The term “formation flying” implies coordinated movement of at least two satellites on coplanar and non-coplanar orbits with a maximum distance between them being much less than the length of the orbit. Peculiarities of formation flying concept also include:- automatic coordination of satellites;- sub-group specialization of formation flying satellites;- equipment and data exchange technology unification in each specialized group or subgroup.Formation flying satellites can be classified according to the configuration stability level (order (array, cluster («swarm», intergroup specialization rules («central satellite», «leader», «slave», manoeuvrability («active» and «passive» satellites.Tasks of formation flying include:- experiments with payload, distributed in formation flying satellites;- various near-earth space and earth-surface research;- super-sized aperture antenna development;- land-based telescope calibration;- «space advertisement» (earth-surface observable satellite compositions of a logotype, word, etc.;- orbital satellite maintenance, etc.Main issues of formation flying satellite system design are:- development of an autonomous satellite group manoeuvring technology;- providing a sufficient characteristic velocity of formation flying satellites;- ballistic and navigation maintenance for satellite formation flying;- technical and economic assessment of formation flying orbital delivery and deployment;- standardization, unification, miniaturization and integration of equipment;- intergroup and intersatellite function redistribution.

  3. Montage of a Queering Deferred: Memory, Ownership, and Archival Silencing in the Rhetorical Biography of Langston Hughes.

    Science.gov (United States)

    Summers, Ian

    2016-01-01

    This article explores the intersection of archival privilege and heteronormative bias in the queering of Langston Hughes. Although it has been a common belief in LGBTQ communities that Hughes was gay, the battle over how his sexuality is defined in various biographical texts involves broader issues of dominant representations of sexuality and who gets to speak for those no longer able to speak for themselves. As such, the article examines the texts Looking for Langston and The Life of Langston Hughes as well as the discourses that surrounded both. Through this case study, it is apparent that there are still numerous cultural challenges posed to historical queering and that scholars must take an inventive approach to overcome them.

  4. Berta and Adelaide: the policy of consolidation of the royal power of Hugh of Arles

    Directory of Open Access Journals (Sweden)

    Giacomo Vignodelli

    2012-10-01

    Full Text Available Both twins dowers made up by Hugh of Provence, king of Italic Kingdom, for his betrothal with Berta and that of his son Lothair with Adelaide, have to be understood within the policy of strengthening the royal power led by the king in the Thirties of the Tenth century: the dowers are in fact the crown of that policy. The double dower constitution supplies the king of Italy the opportunity to reserve for himself (and for the new formed young royal couple a strong control of the center of the Po valley around Pavia and dismantles (for the benefit of the royal domain ducal bases of power in Tuscia. The analysis of the work of Hugh allows us to understand its policy towards the aristocracy and the mechanisms for the promotion of new families (Aleramici, Obertenghi, Canossa. The original documents of dower were kept in the monastery of St. Salvatore of Pavia, founded by Adelaide; this locations isn’t due to the goods endowment of the monastery but to their importance as instrument of political legitimacy of the new Ottonian royal family.

  5. Frequency Effect of Harmonic Noise on the FitzHugh-Nagumo Neuron Model

    Institute of Scientific and Technical Information of China (English)

    宋艳丽

    2011-01-01

    Using harmonic noise,the frequency effect of noise on the FitzHugh-Nagumo neuron model is investigated.The results show that the neuron has a resonance characteristic and responds strongly to the noise with a certain frequency at fixed power.Driven by the noise with this frequency,the train is most regular and the coefficient of variation R has a minimum.The imperfect synchronization takes place,which,however,is optimal only for noise with an appropriate frequency.It is shown that there exists coherence resonance related to frequency.%Using harmonic noise, the frequency effect of noise on the FitzHugh-Nagumo neuron model is investigated. The results show that the neuron has a resonance characteristic and responds strongly to the noise with a certain frequency at fixed power. Driven by the noise with this frequency, the train is most regular and the coefficient of variation R has a minimum. The imperfect synchronization takes place, which, however, is optimal only for noise with an appropriate frequency. It is shown that there exists coherence resonance related to frequency.

  6. 77 FR 15600 - Special Local Regulation; Emerald Coast Super Boat Grand Prix; Saint Andrew Bay; Panama City, FL

    Science.gov (United States)

    2012-03-16

    ... SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulation; Emerald Coast Super Boat Grand... crews, vessels, and persons on navigable waters during the Emerald Coast Super Boat Grand Prix high... the Emerald Coast Super Boat Grand Prix high speed boat races. Basis and Purpose On January 31,...

  7. SÍNDROME DE FITZ-HUGH-CURTIS COMO HALLAZGO DURANTE CIRUGÍA GINECOLÓGICA

    OpenAIRE

    Ricci A,Paolo; Solà D,Vicente; Pardo S,Jack

    2009-01-01

    El síndrome de Fitz-Hugh-Curtis es una perihepatitis producida por una peritonitis secundaria al ascenso de bacterias, como resultado de una enfermedad inflamatoria pélvica. En la etapa crónica se pueden observar adherencias entre la pared abdominal y la superficie hepática, caracterizadas por la semejanza a "cuerdas de violín". Esta imagen es considerada criterio diagnóstico. Se presenta un caso de hallazgo de síndrome de Fitz-Hugh-Curtis, pesquisado durante la inspección rutinaria de la cav...

  8. SÍNDROME DE FITZ-HUGH-CURTIS COMO HALLAZGO DURANTE CIRUGÍA GINECOLÓGICA

    OpenAIRE

    Ricci A,Paolo; Solà D,Vicente; Pardo S,Jack

    2009-01-01

    El síndrome de Fitz-Hugh-Curtis es una perihepatitis producida por una peritonitis secundaria al ascenso de bacterias, como resultado de una enfermedad inflamatoria pélvica. En la etapa crónica se pueden observar adherencias entre la pared abdominal y la superficie hepática, caracterizadas por la semejanza a "cuerdas de violín". Esta imagen es considerada criterio diagnóstico. Se presenta un caso de hallazgo de síndrome de Fitz-Hugh-Curtis, pesquisado durante la inspección rutinaria de la cav...

  9. Ever Fly a Tetrahedron?

    Science.gov (United States)

    King, Kenneth

    2004-01-01

    Few things capture the spirit of spring like flying a kite. Watching a kite dance and sail across a cloud spotted sky is not only a visually appealing experience it also provides a foundation for studies in science and mathematics. Put simply, a kite is an airfoil surface that flies when the forces of lift and thrust are greater than the forces of…

  10. Fitz-Hugh-Curtis syndrome: abdominal pain in women of 26 years old Síndrome de Fitz-Hugh-Curtis: dolor abdominal en mujer de 26 años

    Directory of Open Access Journals (Sweden)

    Liseth Rivero-Sánchez

    2011-10-01

    Full Text Available Fitz-Hugh-Curtis syndrome is an inflammation of the liver capsule as a complication of pelvic inflammatory disease, whose most common etiologic agent is the C. trachomatis. The acute phase of the Fitz-Hugh-Curtis syndrome may present itself with pain in right upper abdomen, commonly confused with other hepatobiliary and gastrointestinal tract diseases. Definitive diagnosis is now possible with non-invasive techniques such as ultrasound, computed tomography, as well as techniques to isolate the responsible germ, available in most centers.El síndrome de Fitz-Hugh-Curtis es una inflamación de la cápsula hepática, como complicación de una enfermedad inflamatoria pélvica, cuyo agente etiológico más frecuente es la C. trachomatis. La fase aguda del síndrome de Fitz-Hugh-Curtis puede presentarse con dolor en cuadrante superior derecho del abdomen, confundiéndose comúnmente con otras enfermedades hepatobiliares y del tracto gastrointestinal. El diagnóstico definitivo es posible hoy en día por técnicas no invasivas como ecografía, tomografía computarizada, además de técnicas para el aislamiento del germen responsable disponibles en la mayoría de los centros.

  11. [Recreational boating accidents--Part 1: Catamnestic study].

    Science.gov (United States)

    Lignitz, Eberhard; Lustig, Martina; Scheibe, Ernst

    2014-01-01

    Deaths on the water are common in the autopsy material of medicolegal institutes situated on the coast or big rivers and lakes (illustrated by the example of the Institute of Legal Medicine of Greifswald University). They mostly occur during recreational boating activities. Apart from hydro-meteorological influences, human error is the main cause of accidents. Often it is not sufficiently kept in mind whether the boat crew is fit for sailing and proper seamanship is ensured. Drowning (following initial hypothermia) is the most frequent cause of death. Medicolegal aspects are not decisive for ordering a forensic autopsy. As statistics are not compiled in a uniform way, a comparison of the data of different institutions engaged in investigating deaths at sea and during water sports activities is hardly possible, neither on a national nor an international basis--and the reconstruction of aquatic accidents is generally difficult. Fatal accidents can only be prevented by completely clarifying their causes.

  12. Solar Photovoltaic Powered Sailing Boat Using Buck Converter

    Directory of Open Access Journals (Sweden)

    Soumya Das

    2015-03-01

    Full Text Available The main objective of this paper is to establish technical and economical aspects of the application of stand-alone photovoltaic (PV system in sailing boat using a buck converter in order to enhance the power generation and also to minimize the cost. Performance and control of dc-dc converter, suitable for photovoltaic (PV applications, is presented here. A buck converter is employed here which extracts complete power from the PV source and feeds into the dc load. The power, which is fed into the load, is sufficient to drive a boat . With the help of matlab simulink software PV module and buck model has been designed and simulated and also compared with theoretical predictions.

  13. Impact of boat-generated waves on intertidal estuarine sediments

    Science.gov (United States)

    Blanpain, O.; Deloffre, J.; Lafite, R.; Gomit, G.; Calluaud, D.; David, L.

    2010-12-01

    Hydrodynamics in the macrotidal Seine estuary (France) are controlled by the semi-diurnal tidal regime modulated seasonally by the fluvial discharge. Wind effect on sediment transport (through wind waves and swell) is observed at the mouth of the estuary. Over the last century, authorities have put emphasis on facilitating economic exchanges by means of embankment building and increased dredging activity. These developments led to allow and secure sea vessel traffic in the Seine estuary (from its mouth to the port of Rouen, 125 km upstream) but they also resulted in a change of estuarine hydrodynamics and sediment transport features. A riversides restoration policy has been recently started by port authorities. In this context, the objective of the field-based study presented is to connect vessel characteristics (i.e. speed, draft...), boat-generated waves and their sedimentary impacts. Such information will be used by stakeholders to manage riverside. The natural intertidal site of interest is located in the fluvial freshwater part of the Seine estuary characterized by a 4.5 m maximum tidal range. The foreshore slope is gently decreasing and surface sediments are composed of fine to coarse sand with occasional mud drapes. In order to decipher boat-generated events, the sampling strategy is based on continuous ADV measurements coupled with a turbidimeter and an altimeter to study sediment dynamics. These instruments are settled in the lower part of the foreshore (i) to obtain a significant dataset (i.e. oceanic instruments are not measuring in air) on a zone statically affected by boat waves and (ii) because most of boat traffic occurs during early flood or late ebb period. Spatial variations are assessed along a cross-section through grain-size analysis of surface sediments and topography measurements using pole technique. Results enhance hydrodynamic and sedimentary impacts of boat-generated waves compared respectively to tidal and wind effects. Long

  14. China's export of boats valued at over200million USD in2010%China's export of boats valued at over 200 million USD in 2010

    Institute of Scientific and Technical Information of China (English)

    Zhang Shouchun

    2011-01-01

    @@ In 2010, China's economy saw a relatively good recovery.The economic operation of the shipbuilding industry was better than expected and the import and export trade of ships developed at high speeds.According to the statistics of China's custom house, thetotal value of the import and export of boats was 295 million USD, up 40.75% from a year ago; the total quantity in import and export trade was 2057200 boats, up 15.26% in quantity from a year ago. Last year, the value of China's export of boats was 204 million USD, up 19.64%;2028700 boats were exported, up 14.79% in the quantity of boats from a year ago.The ratio of the export of boats to the export of ships in 2010 was 1%; the increase rate of boat export was much lower than that of ship export, which was 42.7%.In the first half of 2010, the export trade of boats showed a highspeed increase with monthly average export value of 14.655 million USD while in August and September, export decreased at a significant rate with the lowest value of 9.7324 million USD in September.

  15. U-Boat Worx出租私人用潜艇

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    荷兰潜艇制造商U—Boat Worx(UBW)现推出两款潜艇对外出租,使个人和科学家们能够深入探索神秘的海底世界。客户可自行探索或专门欣赏海底世界的美景与水生物。

  16. Investigation of longitudinal control system for a small hydrofoil boat

    Science.gov (United States)

    Phillips, W. H.; Shaughnessy, J. D.

    1976-01-01

    An analysis of a hydromechanical system for longitudinal control of a small hydrofoil boat is presented. The system incorporates height and acceleration sensors operating flaps on the foils through a mechanical linkage. Effects of some of the system parameters on the stability and response to waves are shown. The results indicate that the system is capable of providing adequate stability, but the response to stern waves at low frequencies is larger than desired.

  17. Deployment of Lightweight Shock Mitigating Boat Manufacturing Innovation

    Science.gov (United States)

    2012-12-21

    VARTM Hull 1267 760 Deck 702 399 Console 540 350 Total 2509 1509 % Current 100% 60% % Savings - 40% Deployment of Lightweight Shock Mitigating...1430 47 Weight Evaluation- Baseline Boat Weights (lb) Segment Baseline 850 A 850 B 850 B-OM Fabrication Method Open Mold Open Mold VARTM Open...Segment Baseline 850 A 850 B 850 B-OM Fabrication Method Open Mold Open Mold VARTM Open Mold Hull 1115 843 717 789 Deck 665 587 481 529

  18. Genoa Boat Show – Good Example of Event Management

    Directory of Open Access Journals (Sweden)

    Dunja Demirović

    2012-07-01

    Full Text Available International Boat Show, a business and tourist event, has been held annually in Italian city of Genoa since 1962. The fair is one of the oldest, largest and best known in the field of boating industry worldwide, primarily due to good management of the event and it can serve as case study for domestic fair organizers to improve the quality of their business and services. Since Belgrade is the city of fairs, but compared to Genoa still underdeveloped in terms of trade shows, the following tasks imposed naturally in this study: to determine the relationship of the organizers of Genoa Boat Show in the sector of preparation and fair offer, in the sector of selection and communication with specific target groups (especially visitors, services during the fair and functioning of the city during the fair. During the research the authors have mostly used historical method, comparison, synthesis and the interview method. The results of theoretical research, in addition, may help not only managers of fair shows and of exhibitions, but also to organizers of other events in our country

  19. University receives $1.4 million science education award from Howard Hughes Medical Institute to support innovate undergraduate science education

    OpenAIRE

    Owczarski, Mark

    2010-01-01

    Virginia Tech was among 50 top research universities nationwide to receive a Precollege and Undergraduate Science Education Program award from the Howard Hughes Medical Institute (HHMI) that will be used to encourage university faculty to develop new ways to teach and inspire undergraduate students about science and research.

  20. Pretext, Context, Subtext: Textual Power in the Writing of Langston Hughes, Richard Wright, and Martin Luther King, Jr.

    Science.gov (United States)

    Bogumil, Mary L.; Molino, Michael R.

    1990-01-01

    Studies verbal pretexts, social subtexts, and interpretive contexts of works by Langston Hughes, Richard Wright, and Martin Luther King, Jr. Notes that cultural repression is propagated (and dispelled) in part through the power of language. Notes that these texts are relevant for teaching textual power in hopes of affecting social change. (RS)

  1. Theoretical analysis and control results for the FitzHugh-Nagumo equation

    Directory of Open Access Journals (Sweden)

    Marko Antonio Rojas-Medar

    2008-12-01

    Full Text Available In this paper we are concerned with some theoretical questions for the FitzHugh-Nagumo equation. First, we recall the system, we briefly explain the meaning of the variables and we present a simple proof of the existence and uniqueness of strong solution. We also consider an optimal control problem for this system. In this context, the goal is to determine how can we act on the system in order to get good properties. We prove the existence of optimal state-control pairs and, as an application of the Dubovitski-Milyoutin formalism, we deduce the corresponding optimality system. We also connect the optimal control problem with a controllability question and we construct a sequence of controls that produce solutions that converge strongly to desired states. This provides a strategy to make the system behave as desired. Finally, we present some open questions related to the control of this equation.

  2. The synchronization of FitzHugh-Nagumo neuron network coupled by gap junction

    Institute of Scientific and Technical Information of China (English)

    Zhan Yong; Zhang Su-Hua; Zhao Tong-Jun; An Hai-Long; Zhang Zhen-Dong; Han Ying-Rong; Liu Hui; Zhang Yu-Hong

    2008-01-01

    It is well known that the strong coupling can synchronize a network of nonlinear oscillators. Synchronization provides the basis of the remarkable computational performance of the brain. In this paper the FitzHugh-Nagumo neuron network is constructed. The dependence of the synchronization on the coupling strength, the noise intensity and the size of the neuron network has been discussed. The results indicate that the coupling among neurons works to improve the synchronization, and noise increases the neuron random dynamics and the local fluctuations; the larger the size of network, the worse the synchronization. The dependence of the synchronization on the strength of the electric synapse coupling and chemical synapse coupling has also been discussed, which proves that electric synapse coupling can enhance the synchronization of the neuron network largely.

  3. A correspondence between the models of Hodgkin-Huxley and FitzHugh-Nagumo revisited

    Science.gov (United States)

    Postnikov, Eugene B.; Titkova, Olga V.

    2016-11-01

    We present the discussion on the possibility to scale the classical dimensionless FitzHugh-Nagumo model of neuronal self-sustained oscillations to the range of variables corresponding to the results, which are provided by the biophysically relevant reduced two-dimensional Hodgkin-Huxley equations (the Rinzel model). It is shown that there exists a relatively simple choice of affine transformation, which results in time-dependent solutions, which reproduce with a high accuracy the time course of the recovery variable and the sharp onsets (intervals of fast motions on a phase trajectories) of the voltage spikes. As for the latter, the reasons for unavoidable difference are discussed as well as a necessity of taking into account applied current values during such a scaling procedure.

  4. Stochastic bifurcation in FitzHugh Nagumo ensembles subjected to additive and/or multiplicative noises

    Science.gov (United States)

    Hasegawa, Hideo

    2008-02-01

    We have studied the dynamical properties of finite N-unit FitzHugh-Nagumo (FN) ensembles subjected to additive and/or multiplicative noises, reformulating the augmented moment method (AMM) with the Fokker-Planck equation (FPE) method [H. Hasegawa, J. Phys. Soc. Japan 75 (2006) 033001]. In the AMM, original 2N-dimensional stochastic equations are transformed to eight-dimensional deterministic ones, and the dynamics is described in terms of averages and fluctuations of local and global variables. The stochastic bifurcation is discussed by a linear stability analysis of the deterministic AMM equations. The bifurcation transition diagram of multiplicative noise is rather different from that of additive noise: the former has the wider oscillating region than the latter. The synchronization in globally-coupled FN ensembles is also investigated. Results of the AMM are in good agreement with those of direct simulations (DSs).

  5. Phase Propagations in a Coupled Oscillator-Excitor System of FitzHugh-Nagumo Models

    Institute of Scientific and Technical Information of China (English)

    ZHOU Lu-Qun; OUYANG Qi

    2006-01-01

    @@ A one-dimensional array of 2N + 1 automata with FitzHugh-Nagumo dynamics, in which one is set to be oscillatory and the others are excitable, is investigated with bi-directional interactions. We find that 1 : 1 rhythm propagation in the array depends on the appropriate couple strength and the excitability of the system. On the two sides of the 1: 1 rhythm area in parameter space, two different kinds of dynamical behaviour of the pacemaker, i.e. phase-locking phenomena and canard-like phenomena, are shown. The latter is found in company with chaotic pattern and period doubling bifurcation. When the coupling strength is larger than a critical value,the whole system ends to a steady state.

  6. Fitz-Hugh-Curtis syndrome lacking typical characteristics of pelvic inflammatory disease.

    Science.gov (United States)

    Mitaka, Hayato; Kitazono, Hidetaka; Deshpande, Gautam A; Hiraoka, Eiji

    2016-06-22

    A 23-year-old Japanese woman, previously a commercial sex worker, presented with a 2-day history of right upper quadrant (RUQ) abdominal pain, worse on deep inspiration. She had noticed increased vaginal discharge 2 months earlier and had developed dull, lower abdominal pain 3 weeks prior to presentation. Although pelvic examination and transvaginal ultrasonography revealed neither a tubal nor ovarian pathology, abdominal CT scan with contrast demonstrated early enhancement of the hepatic capsule, a finding pathognomonic for Fitz-Hugh-Curtis syndrome (FHCS). Cervical discharge PCR assay confirmed Chlamydia trachomatis infection. This case highlights that normal gynaecological evaluation may be insufficient to rule out FHCS, for which physicians should have a high index of suspicion when seeing any woman of reproductive age with RUQ pain. 2016 BMJ Publishing Group Ltd.

  7. Identification of the FitzHugh-Nagumo Model Dynamics via Deterministic Learning

    Science.gov (United States)

    Dong, Xunde; Wang, Cong

    In this paper, a new method is proposed for the identification of the FitzHugh-Nagumo (FHN) model dynamics via deterministic learning. The FHN model is a classic and simple model for studying spiral waves in excitable media, such as the cardiac tissue, biological neural networks. Firstly, the FHN model described by partial differential equations (PDEs) is transformed into a set of ordinary differential equations (ODEs) by using finite difference method. Secondly, the dynamics of the ODEs is identified using the deterministic learning theory. It is shown that, for the spiral waves generated by the FHN model, the dynamics underlying the recurrent trajectory corresponding to any spatial point can be accurately identified by using the proposed approach. Numerical experiments are included to demonstrate the effectiveness of the proposed method.

  8. The African-American grandmother in autobiographical works by Frederick Douglass, Langston Hughes, and Maya Angelou.

    Science.gov (United States)

    Hill-Lubin, M A

    1991-01-01

    Using the autobiographies of Frederick Douglass, Langston Hughes, and Maya Angelou, this article demonstrates that the portrait of the African-American grandmother is one of action, involvement, hope, and dignity. In examining the works, we observe her functioning in three areas: as the preserver and most tenacious survivor of the African extended family; second, as repository and distributor of the family history, wisdom, and black lore; this role places her at the foundation of the Black, oral and written, literary and creative traditions; and third, as the retainer and transmitter of values and ideals that support and enhance her humanity, her family, and her community. This function emphasizes her spirituality. It is suggested that the grandmother, having played an important role in the growth, development, and artistic flowering of the autobiographer, can become a model and source of empowerment for future generations.

  9. Flying and Your Child's Ears

    Science.gov (United States)

    ... Media Flying and Your Child's Ears KidsHealth > For Parents > Flying and Your Child's Ears Print A A A What's in this article? Flying's Effects on Ears Tips for Easing Ear Pain en español Como cuidar los oídos de su hijo(a) cuando vuele en avión Flying's Effects on ...

  10. Flying in North America

    Directory of Open Access Journals (Sweden)

    Jaromír Procházka

    2013-01-01

    Full Text Available Flying all over the world is very challenging and demanding. Although ICAO is covering every specific detail by rules, there are some personal experiences which cannot be substituted. Some of them are point out in the article.

  11. The Fly Printer - Extended

    DEFF Research Database (Denmark)

    Beloff, Laura; Klaus, Malena

    2016-01-01

    Artist talk / Work-in-progress What is the purpose of a machine or an artifact, like the Fly Printer, that is dislocated, that produces images that have no meaning, no instrumentality, that depict nothing in the world? The biological and the cultural are reunited in this apparatus as a possibilit...... the results. The extended version of the Fly Printer containing the technological perception and DNNs is a collaboration between Laura Beloff and Malene Theres Klaus...

  12. Dating the Bibong-ri Neolithic site in Korea: Excavating the oldest ancient boat

    Energy Technology Data Exchange (ETDEWEB)

    Park, Gyujun, E-mail: danielp@kigam.re.k [Geochemical Analysis Center, Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources 305-350 (Korea, Republic of); Kim, Jong-Chan [Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of); Youn, Minyoung; Yun, Chongcheol; Kang, Jin; Song, Yong-Mi; Song, Su-Jin; Noh, Hye-Jin [Electrostatic Accelerator Research Center, NCIRF, Seoul National University, Seoul 151-742 (Korea, Republic of); Kim, Do-Kyun [Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of); Im, Hack-Jong [Gimhae National Museum, Gimhae, Gyeongsangnam-do 621-060 (Korea, Republic of)

    2010-04-15

    The remains of an ancient wooden boat were unearthed at the Bibong-ri shell mound site. The site was located at Bibong-ri, Bugog-myeon, Changnyeong-gun, Gyeongsangnam-do in South Korea. A substantial fragment of the vessel was discovered in the lowest layer of the site. We collected 17 samples of charcoal and wood from pebble, sand, and shell layers. Sample preparation extracted the carbon from each sample material and converted it into graphite for AMS radiocarbon dating. Radiocarbon dates of the samples indicate that they belong to the Neolithic period and that the boat dates from ca. 5700 BC. To this point, the oldest known boat in the world has been a wooden boat dating from ca. 5500 BC in China. Other ancient boats from around the world include a logboat dating from ca. 3600 BC in Japan and a fleet of wooden boats dating from ca. 3000 BC in Egypt. The Bibong-ri boat is the first boat from the Neolithic period ever found in South Korea and must represent one of the world's oldest known boats.

  13. China Xiamen International Boat Show 2011——Making Yachting a new marine leisure fashion

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    The China (Xiamen) International Boat Show 2011 will be staged from November 4-7.Covering an area of 20,000 square meters with 300 berths,it will be China's largest boat show and an extravaganza for yacht manufacturers and enthusiasts.A series of other activities will be held alongside the boat show,such as a welcoming banquet,cruises,a seminar,a photography competition and a wedding upon one of the sailing vessels.The annual international boat show has become a unique attraction of southeast China's Xiamen City.

  14. The behavioural response of Australian fur seals to motor boat noise.

    Directory of Open Access Journals (Sweden)

    Joy S Tripovich

    Full Text Available Australian fur seals breed on thirteen islands located in the Bass Strait, Australia. Land access to these islands is restricted, minimising human presence but boat access is still permissible with limitations on approach distances. Thirty-two controlled noise exposure experiments were conducted on breeding Australian fur seals to determine their behavioural response to controlled in-air motor boat noise on Kanowna Island (39°10'S, 146°18'E. Our results show there were significant differences in the seals' behaviour at low (64-70 dB versus high (75-85 dB sound levels, with seals orientating themselves towards or physically moving away from the louder boat noise at three different sound levels. Furthermore, seals responded more aggressively with one another and were more alert when they heard louder boat noise. Australian fur seals demonstrated plasticity in their vocal responses to boat noise with calls being significantly different between the various sound intensities and barks tending to get faster as the boat noise got louder. These results suggest that Australian fur seals on Kanowna Island show behavioural disturbance to high level boat noise. Consequently, it is recommended that an appropriate level of received boat sound emissions at breeding fur seal colonies be below 74 dB and that these findings be taken into account when evaluating appropriate approach distances and speed limits for boats.

  15. The Behavioural Response of Australian Fur Seals to Motor Boat Noise

    Science.gov (United States)

    Tripovich, Joy S.; Hall-Aspland, Sophie; Charrier, Isabelle; Arnould, John P. Y.

    2012-01-01

    Australian fur seals breed on thirteen islands located in the Bass Strait, Australia. Land access to these islands is restricted, minimising human presence but boat access is still permissible with limitations on approach distances. Thirty-two controlled noise exposure experiments were conducted on breeding Australian fur seals to determine their behavioural response to controlled in-air motor boat noise on Kanowna Island (39°10′S, 146°18′E). Our results show there were significant differences in the seals' behaviour at low (64–70 dB) versus high (75–85 dB) sound levels, with seals orientating themselves towards or physically moving away from the louder boat noise at three different sound levels. Furthermore, seals responded more aggressively with one another and were more alert when they heard louder boat noise. Australian fur seals demonstrated plasticity in their vocal responses to boat noise with calls being significantly different between the various sound intensities and barks tending to get faster as the boat noise got louder. These results suggest that Australian fur seals on Kanowna Island show behavioural disturbance to high level boat noise. Consequently, it is recommended that an appropriate level of received boat sound emissions at breeding fur seal colonies be below 74 dB and that these findings be taken into account when evaluating appropriate approach distances and speed limits for boats. PMID:22623998

  16. Hugh E. Huxley: cambiando el paradigma de la contracción muscular, desde dentro. [Hugh E. Huxley: changing from inside the paradigm of muscle contraction].

    Directory of Open Access Journals (Sweden)

    Adolfo Araci

    2014-04-01

    Full Text Available Desde un punto de vista físico se puede entender la fibra muscular como un motor, es decir, un sistema capaz de transformar la energía química en energía mecánica, que se utiliza para realizar un trabajo. Por lo tanto, para entender cómo ocurre dicho proceso de transformación es necesario conocer la ultraestructura de la fibra muscular. Esta es, sin duda, la principal aportación al acervo científico del recientemente fallecido Hugh Emor Huxley (1924-2013. Huxley se graduó en Física en el Christ’s College de Cambdrige, tras ver interrumpidos temporalmente sus estudios por su dedicación como operario de radar de la Royal Air Force entre 1943 y 1947, durante la Segunda Guerra Mundial (Pollard y Goldman, 2013; Spudich, 2013. Tras su graduación se incorporó como el primer estudiante de doctorado a una unidad de nueva creación del Medical Research Council, el “Laboratorio de Biología Molecular”, dirigida por Max Perutz y John Kendrew, siendo este último el director de sus tesis doctoral, que fue defendida en 1952 (Spudich, 2013. El uso de la técnicas de difracción de rayos X, que permitían el estudio en niveles de resolución inalcanzables con las técnicas microscópicas del momento, y su aplicación a la descripción de la ultraestructura muscular, fueron el objeto de su tesis doctoral, para el desarrollo de la cual diseñó y construyó sus propios instrumentos. El esclarecimiento de los aspectos estructurales implicados en la contracción muscular se convirtió desde entonces en la pregunta central de su biografía científica.

  17. Physiological and physical characteristics of elite dragon boat paddlers.

    Science.gov (United States)

    Ho, Sarah R; Smith, Richard M; Chapman, Philip G; Sinclair, Peter J; Funato, Kazuo

    2013-01-01

    The objectives of this study were to profile the physiological and physical characteristics of elite dragon boat paddlers, to identify characteristics that predict race performance and to quantify the metabolic energy contributions to simulated 200-m and 500-m dragon boat racing. Eleven, national level, male, Japanese dragon boat paddlers completed a battery of tests on a paddling ergometer including an incremental maximal aerobic capacity test, a 2-minute maximal accumulated oxygen deficit (MAOD) test, and simulated 200-m and 500-m races. A physiological and physical profile of subjects was compiled. Results showed that 200-m race performance correlated with flexed arm girth and excess postexercise oxygen consumption (EPOC) measured in the 30 minutes after the MAOD test, whereas 500-m race performance correlated with body fat percentage, relaxed and flexed arm girth, MAOD, EPOC, and peak power during the MAOD test. Stepwise multiple regression revealed that flexed arm girth was the most powerful predictor of 200-m and 500-m race performance, followed by EPOC with the combination of these 2 factors able to explain 74% and 68% of the variance in 200-m and 500-m race performance, respectively. Aerobic energy contributions for 200-m (50 seconds) and 500-m (1 minute 50 seconds) races were (mean (95% confidence intervals)) 52.1% (range, 47.4-56.8%) and 67.5% (range, 60.1-77.8%), respectively. In conclusion, coaches should develop training programs targeted at developing upper-body musculature and increasing anaerobic capacity because these factors are the strongest predictors of 200-m and 500-m race performance. Given the substantial aerobic energy contributions even for a 200-m race event, coaches should aim to increase the maximal aerobic capacity of the paddler in preparation for both 200-m and 500-m events.

  18. On the Writing Style of The Open Boat

    Institute of Scientific and Technical Information of China (English)

    张静

    2012-01-01

      The Open Boat is one of the best realistic stories written by Stephen Crane, an early American naturalist and impressionist writer who dramatically presents the subtle relation between man and nature as well as that of man and society. His personal experience on the sea has an enormous impact on the story. This paper tries to carry out a detailed examination of the story in the light of writing style in order to explore his unique style and the beauty of the story.

  19. Compression fractures of the vertebrae during a "bumpy" boat ride.

    LENUS (Irish Health Repository)

    Chukwunyerenwa, C K

    2012-01-31

    INTRODUCTION: Compression fracture of the vertebrae is common, often the result of falls from height and motor vehicle accidents in the younger age groups. It can occur following minor trauma in the elderly and in those with osteoporosis. MATERIALS AND METHODS: We present an interesting case of compression fracture of the vertebral bodies occurring simultaneously in a couple during a boat ride while on holiday. One individual had fracture of the T8, while the other fractured the L1 vertebrae. Both injuries were treated conservatively with Taylor braces. CONCLUSION: We highlight one of the potential hazards of this recreational activity, and the almost identical fracture pattern in this couple.

  20. The Long-Time Behavior of Legendre Spectral Approximation to Fitz-Hugh-Nagumo Equation%Fitz-Hugh-Nagumo方程Legendre谱逼近的长时间性态

    Institute of Scientific and Technical Information of China (English)

    张伟斌

    2005-01-01

    利用Legendre谱方法对Fitz-Hugh-Nagumo方程在空间方向半离散,得到了其近似解的误差估计,并且证明了近似整体吸引子的存在性和上半连续性,从而为研究该方程的长时间行为提供了一个有效的算法.

  1. Delcam立足中国再创辉煌--访Delcam公司总经理Hugh Humphreys

    Institute of Scientific and Technical Information of China (English)

    王崇民; 朱旭

    2004-01-01

    @@ 进入2004年以来,Delcam(中国)公司表现得非常活跃,在进行一系列人事调整之后,西安办事处正式挂牌,紧接着又将北京迪勒克斯科技发展有限公司纳入旗下,使其成为Delcam(中国)华北地区增值经销商,在签约仪式上,记者见到了专程从英国前来祝贺的Delcam PLC集团公司总经理HughHumphreys先生,开朗、风趣的HughHumphreys先生非常愉快地接受了本刊记者的采访.

  2. 2002 Report to Congress: Evaluating the Consensus Best Practices Developed through the Howard Hughes Medical Institute’s Collaborative Hazardous Waste Management Demonstration Project

    Science.gov (United States)

    This report discusses a collaborative project initiated by the Howard Hughes Medical Institute (HHMI) to establish and evaluate a performance-based approach to management of hazardous wastes in the laboratories of academic research institutions.

  3. ANALYSIS OF FLYING BIKE

    OpenAIRE

    Momin Irfan Ali Nasir Husain *1, Shah mohd. Rafique rahmatullah *2, Naumanulhaq Barkatullah Shaikh *3, Khatib Mohd. Azimuddin Najimuddin *4, Ansari Mohammad Naasir Shamsudduha *5, Ansari Mohammad Parvez Abdul Qayyum*6, Momin Mohammad Rayyan Mohammad Shakeel*7, Ansari Peer Mohammed Munna *8, Prof. Mohd. Musharraf Aamir

    2016-01-01

    Flying Bike vertical take-off and landing (VTOL) type machine which also follows Newton’s third law. It is thought of as a conventional type of aircraft with special features added to enable it to rise vertically during take-off and to land from a vertical descent.  It flies with two propellers located at front and back side. These propellers are having hovering abilities. The vehicle is controlled by tilting the propellers by using lever mechanism. Rotation is carried out by diffe...

  4. New type of chimera structures in a ring of bistable FitzHugh-Nagumo oscillators with nonlocal interaction

    Science.gov (United States)

    Shepelev, I. A.; Vadivasova, T. E.; Bukh, A. V.; Strelkova, G. I.; Anishchenko, V. S.

    2017-04-01

    We study the spatiotemporal dynamics of a ring of nonlocally coupled FitzHugh-Nagumo oscillators in the bistable regime. A new type of chimera patterns has been found in the noise-free network and when isolated elements do not oscillate. The region of existence of these structures has been explored when the coupling range and the coupling strength between the network elements are varied.

  5. Has aid for AIDS raised all health funding boats?

    Science.gov (United States)

    Shiffman, Jeremy; Berlan, David; Hafner, Tamara

    2009-11-01

    Global health analysts have debated whether donor prioritization of HIV/AIDS control has lifted all boats, raising attention and funding levels for health issues aside from HIV/AIDS. We investigate this question, considering donor funding for 4 historically prominent health agendas-HIV/AIDS, health systems strengthening, population and reproductive health, and infectious disease control-over the decade 1998-2007. We employ funding data from the Development Assistance Committee of the Organization for Economic Cooperation and Development, which tracks donor aid. The data indicate that HIV/AIDS may have helped to increase funding for the control of other infectious diseases; however, there is no firm evidence that other health issues beyond the control of infectious diseases have benefited. Between 1998 and 2007, funding for HIV/AIDS control rose from just 5.5% to nearly half of all aid for health. Over the same period, funding for health systems strengthening declined from 62.3% to 23.9% of total health aid and that for population and reproductive health declined from 26.4% to 12.3%. Also, even as total aid for health tripled during this decade, aid for health systems strengthening largely stagnated. Overall, the data indicate little support for the contention that donor funding for HIV/AIDS has lifted all boats.

  6. Comparison of Ferry Boat and Highway Bridge Energy Use

    Directory of Open Access Journals (Sweden)

    Wayne D. Cottrell

    2011-01-01

    Full Text Available Passenger ferries serve a variety of transport needs in the U.S., such as providing vital links across bodies of water, and supplementing highway bridges. In some cases in which there is a ferry connection but no bridge, a bridge would be impractical; in other cases, a bridge might be feasible. The paper compares the energy consumption of ferries and motor vehicles on bridges, to determine which link is more fuel efficient. One finding is that limited data are available on ferry boat fuel consumption: despite there being 208 ferry boat operators in the U.S. as of 2008, only eight were providing energy use data to the National Transit Database. Examinations of three of the systems found that the passenger-MPG of the ferries ranged from 2.61 to 14.00 (1.11 to 5.95 km/L, while that of the motor vehicles on adjacent highway bridge connections ranged from 25.34 to 32.45 (10.77 to 13.79 km/L. Data from the eight systems are used to develop a ferry MPG model. The model is used to show that the Ryer Island and Charles Hall Ferries are less fuel efficient than hypothetical bridges in those locations. The fuel efficiencies and consumptions of the ferries would equal those of motor vehicles on the bridges, however, if smaller vessels were used, and if the frequency of service was reduced.

  7. 76 FR 78151 - Special Local Regulations; Boca Raton Holiday Boat Parade, Intracoastal Waterway, Boca Raton, FL

    Science.gov (United States)

    2011-12-16

    ... SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulations; Boca Raton Holiday Boat Parade, Intracoastal Waterway, Boca Raton, FL AGENCY: Coast Guard, DHS. ACTION: Temporary final rule... Waterway in Boca Raton, Florida during the Boca Raton Holiday Boat Parade on Saturday, December 17,...

  8. First steps towards conformationally selective artificial lectins: the chair-boat discrimination by molecularly imprinted polymers.

    Science.gov (United States)

    de Talancé, Vincent Lemau; Massinon, Olivier; Baati, Rachid; Wagner, Alain; Vincent, Stéphane P

    2012-11-07

    A series of molecularly imprinted polymers (MIPs) were prepared in the presence of a synthetic galactoside locked in a (1,4)B boat conformation. This study demonstrates that, depending on the polymerisation technique, an organic material can selectively bind a carbohydrate in a biologically relevant boat conformation.

  9. 46 CFR 116.1120 - Drainage of cockpit vessels, well deck vessels, and open boats.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Drainage of cockpit vessels, well deck vessels, and open boats. 116.1120 Section 116.1120 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL... Drainage of cockpit vessels, well deck vessels, and open boats. Drainage of cockpit vessels, well...

  10. 33 CFR 100.109 - Winter Harbor Lobster Boat Race, Winter Harbor, ME.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Winter Harbor Lobster Boat Race, Winter Harbor, ME. 100.109 Section 100.109 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Lobster Boat Race, Winter Harbor, ME. (a) Regulated area. The regulated area includes all waters of...

  11. 33 CFR 100.118 - Searsport Lobster Boat Races, Searsport Harbor, ME.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Searsport Lobster Boat Races, Searsport Harbor, ME. 100.118 Section 100.118 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Lobster Boat Races, Searsport Harbor, ME. (a) Regulated Area. The regulated area includes all waters...

  12. 77 FR 3784 - Recreational Boating Safety Projects, Programs and Activities Funded Under Provisions of the...

    Science.gov (United States)

    2012-01-25

    ...). Web-based Document Management System: Funding was provided to continue to provide a Web-based document management system to better enable the handling of thousands of recreational boating recall case and campaign... accessibility requirements. ($1,110). Boating Accident Report Database (BARD) Web System: Funding was allocated...

  13. 75 FR 61508 - Agency Information Collection Activities: Canadian Border Boat Landing Permit (CBP Form I-68)

    Science.gov (United States)

    2010-10-05

    ... Landing Permit (CBP Form I-68) AGENCY: U.S. Customs and Border Protection (CBP), Department of Homeland... concerning the Canadian Border Boat Landing Permit (Form I- ] 68). This request for comment is being made... Form I-68. Abstract: The Canadian Border Boat Landing Permit (CBP Form I-68) allows...

  14. 78 FR 73875 - Agency Information Collection Activities: Canadian Border Boat Landing Permit (CBP Form I-68)

    Science.gov (United States)

    2013-12-09

    ... Landing Permit (CBP Form I-68) AGENCY: U.S. Customs and Border Protection (CBP), Department of Homeland... requirement concerning the Canadian Border Boat Landing Permit (Form I-68). This request for comment is being... Form I-68. Abstract: The Canadian Border Boat Landing Permit (CBP Form I-68) allows...

  15. 33 CFR 100.909 - Chinatown Chamber of Commerce Dragon Boat Race; Chicago, IL.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Chinatown Chamber of Commerce Dragon Boat Race; Chicago, IL. 100.909 Section 100.909 Navigation and Navigable Waters COAST GUARD... Chinatown Chamber of Commerce Dragon Boat Race; Chicago, IL. (a) Regulated Area. All waters of the...

  16. 33 CFR 100.1302 - Special Local Regulation, Annual Dragon Boat Races, Portland, Oregon.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Special Local Regulation, Annual Dragon Boat Races, Portland, Oregon. 100.1302 Section 100.1302 Navigation and Navigable Waters COAST... § 100.1302 Special Local Regulation, Annual Dragon Boat Races, Portland, Oregon. (a) Regulated area....

  17. 33 CFR 100.903 - Harborfest Dragon Boat Race; South Haven, MI.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Harborfest Dragon Boat Race; South Haven, MI. 100.903 Section 100.903 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Dragon Boat Race; South Haven, MI. (a) Regulated Area. A regulated area is established to include...

  18. 78 FR 24065 - Special Local Regulation; Tuscaloosa Dragon Boat Races; Black Warrior River; Tuscaloosa, AL

    Science.gov (United States)

    2013-04-24

    ... the Junior League of Tuscaloosa Dragon Boat Races. This event is advertised as scheduled and... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulation; Tuscaloosa Dragon Boat...

  19. 77 FR 23125 - Special Local Regulation; Tuscaloosa Dragon Boat Race; Black Warrior River; Tuscaloosa, AL

    Science.gov (United States)

    2012-04-18

    ... associated with the Jr. League of Tuscaloosa Dragon Boat Races. This event is advertised as scheduled and... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulation; Tuscaloosa Dragon Boat...

  20. 76 FR 7701 - Special Local Regulations; Krewe of Charleston Mardi Gras Boat Parade, Charleston Harbor...

    Science.gov (United States)

    2011-02-11

    ... SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulations; Krewe of Charleston Mardi... Mardi Gras Boat Parade on the Ashley River and in Charleston Harbor in Charleston, South Carolina. This... Guard did not receive notice of the Krewe of Charleston Mardi Gras Boat Parade with sufficient time...

  1. Lian-Sheng Ma, Editor-in-Chief of WJG, warmly meets Professor Hugh J Freeman from the University of British Columbia

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Lian-Sheng Ma, Editor-in-Chief of World Journal of Gastroenterology (WJG), warmly met Professor Hugh J Freeman from the University of British Columbia at Peninsula Hotel in Beijing on August 28, 2007. Professor Hugh J Freeman gave much helpful advice toward the further development of WJG. He will serve as series editor for a new column called OBSERVER which will start in WJG in 2008.

  2. Dynamical System Approach for Edge Detection Using Coupled FitzHugh-Nagumo Neurons.

    Science.gov (United States)

    Li, Shaobai; Dasmahapatra, Srinandan; Maharatna, Koushik

    2015-12-01

    The prospect of emulating the impressive computational capabilities of biological systems has led to considerable interest in the design of analog circuits that are potentially implementable in very large scale integration CMOS technology and are guided by biologically motivated models. For example, simple image processing tasks, such as the detection of edges in binary and grayscale images, have been performed by networks of FitzHugh-Nagumo-type neurons using the reaction-diffusion models. However, in these studies, the one-to-one mapping of image pixels to component neurons makes the size of the network a critical factor in any such implementation. In this paper, we develop a simplified version of the employed reaction-diffusion model in three steps. In the first step, we perform a detailed study to locate this threshold using continuous Lyapunov exponents from dynamical system theory. Furthermore, we render the diffusion in the system to be anisotropic, with the degree of anisotropy being set by the gradients of grayscale values in each image. The final step involves a simplification of the model that is achieved by eliminating the terms that couple the membrane potentials of adjacent neurons. We apply our technique to detect edges in data sets of artificially generated and real images, and we demonstrate that the performance is as good if not better than that of the previous methods without increasing the size of the network.

  3. The relaxation time of processes in a FitzHugh-Nagumo neural system with time delay

    Energy Technology Data Exchange (ETDEWEB)

    Gong Ailing; Zeng Chunhua [Faculty of Science, Kunming University of Science and Technology, Kunming 650093 (China); Wang Hua, E-mail: zchh2009@126.com [Province Engineering Research Center of Industrial Energy Conservation and New Technology, Kunming University of Science and Technology, Kunming, Yunnan 650093 (China)

    2011-08-01

    In this paper, we study the relaxation time (RT) of the steady-state correlation function in a FitzHugh-Nagumo neural system under the presence of multiplicative and additive white noises and time delay. The noise correlation parameter {lambda} can produce a critical behavior in the RT as functions of the multiplicative noise intensity D, the additive noise intensity Q and the time delay {tau}. That is, the RT decreases as the noise intensities D and Q increase, and increases as the time delay {tau} increases below the critical value of {lambda}. However, above the critical value, the RT first increases, reaches a maximum, and then decreases as D, Q and {tau} increase, i.e. a noise intensity D or Q and a time delay {tau} exist, at which the time scales of the relaxation process are at their largest. In addition, the additive noise intensity Q can also produce a critical behavior in the RT as a function of {lambda}. The noise correlation parameter {lambda} first increases the RT of processes, then decreases it below the critical value of Q. Above the critical value, {lambda} increases it.

  4. Robust Synchronization of Delayed Chaotic FitzHugh-Nagumo Neurons under External Electrical Stimulation

    Directory of Open Access Journals (Sweden)

    Muhammad Rehan

    2012-01-01

    Full Text Available Synchronization of chaotic neurons under external electrical stimulation (EES is studied in order to understand information processing in the brain and to improve the methodologies employed in the treatment of cognitive diseases. This paper investigates the dynamics of uncertain coupled chaotic delayed FitzHugh-Nagumo (FHN neurons under EES for incorporated parametric variations. A global nonlinear control law for synchronization of delayed neurons with known parameters is developed. Based on local and global Lipschitz conditions, knowledge of the bounds on the neuronal states, the Lyapunov-Krasovskii functional, and the L2 gain reduction, a less conservative local robust nonlinear control law is formulated to address the problem of robust asymptotic synchronization of delayed FHN neurons under parametric uncertainties. The proposed local control law guarantees both robust stability and robust performance and provides the L2 bound for uncertainty rejection in the synchronization error dynamics. Separate conditions for single-input and multiple-input control schemes for synchronization of a wide class of FHN systems are provided. The results of the proposed techniques are verified through numerical simulations.

  5. THE ONE-DIMENSIONAL HUGHES MODEL FOR PEDESTRIAN FLOW: RIEMANN-TYPE SOLUTIONS

    Institute of Scientific and Technical Information of China (English)

    Debora Amadori; M. Di Francesco

    2012-01-01

    This paper deals with a coupled system consisting of a scalar conservation law and an eikonal equation,called the Hughes model.Introduced in [24],this model attempts to describe the motion of pedestrians in a densely crowded region,in which they are seen as a 'thinking' (continuum) fluid.The main mathematical difficulty is the discontinuous gradient of the solution to the eikonal equation appearing in the flux of the conservation law.On a one dimensional interval with zero Dirichlet conditions (the two edges of the interval are interpreted as 'targets'),the model can be decoupled in a way to consider two classical conservation laws on two sub-domains separated by a turning point at which the pedestrians change their direction.We shall consider solutions with a possible jump discontinuity around the turning point.For simplicity,we shall assume they are locally constant on both sides of the discontinuity.We provide a detailed description of the localin-time behavior of the solution in terms of a 'global' qualitative property of the pedestrian density (that we call 'relative evacuation rate'),which can be interpreted as the attitude of the pedestrians to direct towards the left or the right target.We complement our result with explicitly computable examples.

  6. Noise-sustained synchronization between electrically coupled FitzHugh-Nagumo networks

    Science.gov (United States)

    Cascallares, Guadalupe; Sánchez, Alejandro D.; dell'Erba, Matías G.; Izús, Gonzalo G.

    2015-09-01

    We investigate the capability of electrical synapses to transmit the noise-sustained network activity from one network to another. The particular setup we consider is two identical rings with excitable FitzHugh-Nagumo cell dynamics and nearest-neighbor antiphase intra-ring coupling, electrically coupled between corresponding nodes. The whole system is submitted to independent local additive Gaussian white noises with common intensity η, but only one ring is externally forced by a global adiabatic subthreshold harmonic signal. We then seek conditions for a particular noise level to promote synchronized stable firing patterns. By running numerical integrations with increasing η, we observe the excitation activity to become spatiotemporally self-organized, until η is so strong that spoils sync between networks for a given value of the electric coupling strength. By means of a four-cell model and calculating the stationary probability distribution, we obtain a (signal-dependent) non-equilibrium potential landscape which explains qualitatively the observed regimes, and whose barrier heights give a good estimate of the optimal noise intensity for the sync between networks.

  7. Subthreshold and suprathreshold vibrational resonance in the FitzHugh-Nagumo neuron model

    Science.gov (United States)

    Zhu, Jinjie; Kong, Chen; Liu, Xianbin

    2016-09-01

    We study the subthreshold and suprathreshold vibrational resonance in the FitzHugh-Nagumo neuron model. For the subthreshold situation, two cases where the stationary states are equilibrium point and limit cycle are considered, where different natures of vibrational resonance are observed via theoretical and numerical methods. Especially when the frequency of the high-frequency driving force is near the so-called canard-resonance frequency, the firing rate can be significantly enhanced at the presence of noise. For the suprathreshold situation, we show that the local maxima of the response amplitude are located at the transition boundaries of different phase-locking patterns. The minimal required forcing amplitudes of high-frequency signal of the firing onset are just multiples of the spiking frequency. Furthermore, phase portraits and time series show that the presence of the global maxima of the response results from not only the suprathreshold but also the subthreshold phase-locking modes. In spite of the distinct characteristics for two stationary states on subthreshold oscillation, the suprathreshold vibrational resonance showed no qualitative difference between the two cases.

  8. Adaptable Analytical Vistas Illumine a Touchstone: Langston Hughes as Minor Author/Poet

    Directory of Open Access Journals (Sweden)

    Mzenga A. Wanyama

    2013-12-01

    Full Text Available The authentic association of spontaneity, as a spur or basis for artistic expression, with the vaunted notion of autonomy in literary creationis nowhere more clearly established than in the work of theorists Gilles Deleuze and Felix Guattari as they, inter-alia, explicate the unique literary repertoire bestowed upon the world by Franz Kafka. In their acclaimed works: Kafka: Toward a Minor Literature and Anti-Oedipus: Capitalism and Schizophrenia,they offered to literary theory the fascinating and analytically productive constructs of deterritorialization and anti-Oedipus in the context of a compelling portraiture of the ways in which various institutionalized relationships subtly prescribe and reinforce inequity in society’s power mechanics that tendentiously impact, among other realities, the nature and quality of literary products. They offered, in the process, a refreshing definition of minor literature that unequivocally restores to literature its distinctive place and role in the amalgamated adjudications of society’s intergroup dissensions. In this regard, the present paper subscribes to the idea that spontaneity equaled the intrinsic and immutable desire of the gifted literary mind of African-American author/poet Langston Hughes to reach expressivity in accordance, strictly, with his unalloyed literary vision and thus made autonomy the inevitable upshot of his inspiration and practice.

  9. Quagga and zebra mussel risk via veliger transfer by overland hauled boats

    Directory of Open Access Journals (Sweden)

    Larry B. Dalton

    2013-04-01

    Full Text Available Invasive quagga and zebra mussels (Dreissena rostriformis bugensis and Dreissena polymorpha, respectively pose a great threat to USwaters. Recreational boats constitute a significant risk for spreading the organisms. Recreational boats circulate large amounts of raw waterwhen in use, and if not drained and dried correctly can transport many mussel larvae, called veligers. Veligers experience very high mortality rates; however, the number of potentially transported veligers can be a serious risk to non-infested bodies of water, especially if multiple boats are involved. The risk of veliger transport was calculated for Lake Mead and Lake Michigan using boat capacities for water circulation and specific veliger density data. Results illustrate the importance of draining, drying, and/or decontaminating recreational boats after use.

  10. Design and realization a skiff racing boat hull made of natural fibers reinforced composite

    Science.gov (United States)

    Collotta, M.; Solazzi, L.; Pandini, S.; Tomasoni, G.; Alberti, M.; Donzella, G.

    2016-05-01

    This paper discusses the development of a racing boat with an hull made of a composite material reinforced by natural fibers. In particular, we report here the design and realization of the boat hull, the assessment of its mechanical performance by means of a computer assisted simulation, and the cost analysis to assess the economic sustainability of the new composite developed. The results have shown that the new composite has a performance comparable with conventional glass fiber reinforced composites employed for the realization of this type of boat, accordingly to the technology employed and the lamination sequence adopted. Moreover, the FEM analysis performed over the skiff of the designed and constructed boat has demonstrated a successful choice of the material for real application, as it was later confirmed by the good performance of the boat in water. Finally, the cost analysis highlighted the economic sustainability of the new composite, allowing a cost saving of over 28% with respect to carbon fiber composites.

  11. Kite-Flying Fun

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    China’s kite capital welcomes flying enthusiasts from across the world to its annual carnival Tens of thousands of kite enthusiast from all over the world gathered under the growing swarm of brightly colored kites. Some of the floating and billowing forms had been fashioned into

  12. Hydration of fly ash cement

    Energy Technology Data Exchange (ETDEWEB)

    Etsuo Sakai; Shigeyoshi Miyahara; Shigenari Ohsawa; Seung-Heun Lee; Masaki Daimon [Tokyo Institute of Technology, Tokyo (Japan). Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering

    2005-06-01

    It is necessary to establish the material design system for the utilization of large amounts of fly ash as blended cement instead of disposing of it as a waste. Cement blended with fly ash is also required as a countermeasure to reduce the amount of CO{sub 2} generation. In this study, the influences of the glass content and the basicity of glass phase on the hydration of fly ash cement were clarified and hydration over a long curing time was characterized. Two kinds of fly ash with different glass content, one with 38.2% and another with 76.6%, were used. The hydration ratio of fly ash was increased by increasing the glass content in fly ash in the specimens cured for 270 days. When the glass content of fly ash is low, the basicity of glass phase tends to decrease. Reactivity of fly ash is controlled by the basicity of the glass phase in fly ash during a period from 28 to 270 days. However, at an age of 360 days, the reaction ratios of fly ash show almost identical values with different glass contents. Fly ash also affected the hydration of cement clinker minerals in fly ash cement. While the hydration of alite was accelerated, that of belite was retarded at a late stage.

  13. 78 FR 42733 - Safety Zone; Cleveland Dragon Boat Festival and Head of the Cuyahoga, Cuyahoga River, Cleveland, OH

    Science.gov (United States)

    2013-07-17

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Cleveland Dragon Boat Festival and Head of... during the Dragon Boat Festival and Head of the Cuyahoga boating events. The safety zone established by...: http://www.regulations.gov . (2) Fax: 202-493-2251. (3) Mail: Docket Management Facility (M-30), U.S...

  14. 78 FR 25574 - Special Local Regulations; Third Annual Space Coast Super Boat Grand Prix, Atlantic Ocean; Cocoa...

    Science.gov (United States)

    2013-05-02

    ... Super Boat Grand Prix, Atlantic Ocean; Cocoa Beach, FL AGENCY: Coast Guard, DHS. ACTION: Temporary final... Ocean east of Cocoa Beach, Florida during the Space Coast Super Boat Grand Prix, a series of high-speed... Ocean east of Cocoa Beach, Florida. Approximately 30 high-speed power boats are anticipated...

  15. An annotated checklist of the horse flies, deer flies, and yellow flies (Diptera: Tabanidae) of Florida

    Science.gov (United States)

    The family Tabanidae includes the horse flies, deer flies, and yellow flies and is considered a significant pest of livestock throughout the United States, including Florida. Tabanids can easily become a major pest of man, especially salt marsh species which are known to readily feed on humans and o...

  16. OBITUARY: Eur.Ing. Professor David Dew-Hughes in memoriam

    Science.gov (United States)

    Campbell, Archie; Dew-Hughes, Denise; Donaldson, Gordon; Palmer, Richard

    2007-06-01

    We regret to announce the death of David Dew-Hughes, the second Honorary Editor of Superconductor Science and Technology, in Autumn 2006. He was born in Manchester, the eldest of three children, attended Manchester Grammar School and took his first degree in metallurgy at Birmingham, before undertaking a Doctorate of Engineering at Yale University. After initial work for IBM on semiconductors, he returned to England as a lecturer in metallurgy at Cambridge University. There he devoted his career to superconductivity long before it became fashionable, starting a group on the properties of what we now know as type II materials, with his students Jan Evetts, Archie Campbell and Anant Narlikar. Between them they paved the way to our understanding of the magnetic vortex properties of these materials, and thus to the development of modern practical materials for superconducting magnets. Eur.Ing. Professor David Dew-Hughes 1932-2006 In 1965 he became a founding Senior Lecturer in physics at Lancaster University, moving to Brookhaven National Laboratory in 1974. His final academic post was in engineering science at Oxford University where he also held a University College Tutorial Fellowship. As long ago as 1971 David wrote an authoritative review for Reports on Progress in Physics on 'The metallurgical enhancement of type II superconductors'. Following the discovery of high-Tc superconductivity, IOP Publishing launched Superconductor Science and Technology in 1988 and he was a founder member of its Editorial Board. When Jan Evetts retired as Honorary Editor in 1992, David was the natural choice as his successor. He served a five year term and remained on the Board as Deputy Editor until the end of 2000. To mark the 10th anniversary of high-temperature superconductivity in 1997, David edited a special issue of Superconductor Science and Technology in which past and present members of the Editorial Board contributed reviews of their specialities. He noted that at that time

  17. Experimental Evaluation of the Hydrodynamic Response of Crew Boat Hulls

    DEFF Research Database (Denmark)

    Pecher, Arthur; Kofoed, Jens Peter

    This report presents the results of an experimental study on 3 different hulls of crew boats intended for service to offshore wind turbines. Their hydrodynamic behaviour has been tested in various sea states representing general wave conditions that could be expected at offshore wind farms. Two...... main setups were used during the tests, corresponding to the hulls being connected to an offshore windmill and being free floating. The following aspects were the main subjects of investigation: • The Response Amplitude Operators of the hulls in two different configurations and with waves coming from 3...... the supervision of Jens Peter Kofoed in the deep wave basin in the Hydraulics and Coastal Engineering laboratory at Aalborg University during spring 2012....

  18. Effect of boat noise and angling on lake fish behaviour

    DEFF Research Database (Denmark)

    Jacobsen, Lene; Baktoft, Henrik; Jepsen, Niels;

    2014-01-01

    The effects of disturbances from recreational activities on the swimming speed and habitat use of roach Rutilus rutilus, perch Perca fluviatilis and pike Esox lucius were explored. Disturbances were applied for 4h as (1) boating in short intervals with a small outboard internal combustion engine...... was significantly higher during disturbances [both (1) and (2)] with an immediate reaction shortly after the engine started. Perca fluviatilis displayed increased swimming activity during the first hour of disturbance but not during the following hours. Swimming activity of E. lucius was not significantly different...... between disturbance periods and the same periods on days without disturbance (control). Rutilus rutilus increased their use of the central part of the lake during disturbances, whereas no habitat change was observed in P. fluviatilis and E. lucius. No difference in fish response was detected between...

  19. Terrestrial laser scanning used to detect asymmetries in boat hulls

    Science.gov (United States)

    Roca-Pardiñas, Javier; López-Alvarez, Francisco; Ordóñez, Celestino; Menéndez, Agustín; Bernardo-Sánchez, Antonio

    2012-01-01

    We describe a methodology for identifying asymmetries in boat hull sections reconstructed from point clouds captured using a terrestrial laser scanner (TLS). A surface was first fit to the point cloud using a nonparametric regression method that permitted the construction of a continuous smooth surface. Asymmetries in cross-sections of the surface were identified using a bootstrap resampling technique that took into account uncertainty in the coordinates of the scanned points. Each reconstructed section was analyzed to check, for a given level of significance, that it was within the confidence interval for the theoretical symmetrical section. The method was applied to the study of asymmetries in a medium-sized yacht. Identified were differences of up to 5 cm between the real and theoretical sections in some parts of the hull.

  20. CT Diagnosis of Fitz-Hugh and Curtis Syndrome: Value of the Arterial Phase Scan

    Energy Technology Data Exchange (ETDEWEB)

    Joo, Seung Ho; Kim, Myeong Jin; Lim, Joon Seok; Kim, Joo Hee; Kim, Ki Whang [Yonsei University College of Medicine, Seoul (Korea, Republic of)

    2007-02-15

    We wanted to evaluate the role of the arterial phase (AP) together with the portal venous phase (PP) scans in the diagnosis of Fitz-Hugh-Curtis syndrome (FHCS) with using computed tomography (CT). Twenty-five patients with FHCS and 25 women presenting with non-specifically diagnosed acute abdominal pain and who underwent biphasic CT examinations were evaluated. The AP scan included the upper abdomen, and the PP scan included the whole abdomen. Two radiologists blindly and retrospectively reviewed the PP scans first and then they reviewed the AP plus PP scans. The diagnostic accuracy of FHCS on each image set was compared for each reader by analyzing the area under the receiver operating characteristic curve (Az). Weighted kappa (wk) statistics were used to measure the interobserver agreement for the presence of CT signs of the pelvic inflammatory disease (PID) on the PP images and FHCS as the diagnosis based on the increased perihepatic enhancement on both sets of images. The individual diagnostic accuracy of FHCS was higher on the biphasic images (Az = 0.905 and 0.942 for reader 1 and 2, respectively) than on the PP images alone (Az = 0.806 and 0.706, respectively). The interobserver agreement for the presence of PID on the PP images was moderate (wk = 0.530). The interobserver agreement for FHCS as the diagnosis was moderate on only the PP images (wk = 0.413), but it was substantial on the biphasic images (wk 0.719). Inclusion of the AP scan is helpful to depict the increased perihepatic enhancement, and it improves the diagnostic accuracy of FHCS on CT.

  1. Evidence for Aedes aegypti (Diptera: Culicidae) Oviposition on Boats in the Peruvian Amazon.

    Science.gov (United States)

    Guagliardo, Sarah Anne; Morrison, Amy C; Luis Barboza, Jose; Wesson, Dawn M; Ponnusamy, Loganathan; Astete, Helvio; Vazquez-Prokopec, Gonzalo; Kitron, Uriel

    2015-07-01

    Dengue vector Aedes aegypti L. is invading peri-urban and rural areas throughout Latin America. Our previous research in the Peruvian Amazon has shown that river boats are heavily infested with immature and adult Ae. aegypti mosquitoes, likely playing a major role in their long-distance dispersal and successful invasion. However, the presence of immature mosquitoes provides no information about the timing of oviposition, and whether it took place in the boats. Here, we used baited ovitraps deployed on river boats to test the hypothesis that Ae. aegypti oviposition occurs during boat travel. We deployed 360 ovitraps on 60 different barges during August and October of 2013, and February 2014 (with 20 barges sampled during each month). We found that Ae. aegypti mosquitoes in 22 individual ovitraps from 15 of the 60 barges (premise index 25%) across all sampling dates. Further, the distribution of Ae. aegypti egg abundance was highly aggregated: 2.6% of traps (N=7) were responsible for 71.8% of eggs found, and 1.5% of traps (N=4) were responsible for all (100%) of the larvae found. Similarly, 5% of boats were responsible for the 71.47% of eggs. Our results provide strong evidence that Ae. aegypti oviposition commonly occurs during boat travel. Baited ovitraps could represent a cost-effective means of monitoring and controlling mosquito populations on boats.

  2. Flying Saucer? Aliens?

    Science.gov (United States)

    1961-01-01

    No, it's not a flying saucer, it is the domed top to a 70 foot long vacuum tank at the Lewis Research Center's Electric Propulsion Laboratory, Cleveland, Ohio. The three technicians shown here in protective clothing had just emerged from within the tank where they had been cleaning in the toxic mercury atmosphere, left after ion engine testing in the tank. Lewis has since been renamed the John H. Glenn Research Center.

  3. Discussions on the possible origin of Europe's first boats - 11,500 BP

    Directory of Open Access Journals (Sweden)

    Peter Fletcher

    2015-08-01

    Full Text Available Three decades ago Detlev Ellmers suggested that hide (skin boats were being used to hunt swimming reindeer in glacial lakes of northern Germany's Upper Palaeolithic. This paper presents new material in support of Ellmers' contention. A paleo-osteological study from Stellmoor suggests that arrows were directed at the neck and upper shoulders from above and behind, at close range which can be considered evidence of them being shot by hunters in boats as the animals were swimming. Lyngby axes are linked to this hunting technique which provides possible distribution and dating for this proposed early boat technology.

  4. How Hugh Hampton Young's treatment of President Woodrow Wilson's urinary retention and urosepsis affected the resolution of World War I.

    Science.gov (United States)

    Fogg, Ryan; Kutikov, Alexander; Uzzo, Robert G; Canter, Daniel

    2011-09-01

    President Woodrow Wilson was never able to gain ratification of the Treaty of Versailles, the peace accord to end World War I. Before he could convince the American people of the importance of ratification, Wilson suffered a stroke followed by life threatening urinary sepsis due to urinary retention, and was treated by the father of modern urology, Hugh Hampton Young. The effects of these health problems are examined in the context of their implications on international affairs. Biographical sources and primary documentation of Wilson's physicians were reviewed to determine the effect of Wilson's stroke on his voiding habits. Hugh Hampton Young's evaluation and decision making is examined in depth. In the fall of 1919 President Wilson was recovering from a stroke. Shortly after the stroke his preexisting voiding dysfunction progressed to urinary retention from which urinary sepsis developed. Hugh Hampton Young advised on Wilson's case and counseled patience over surgery. The President began voiding spontaneously and recovered from sepsis. The illness left him severely weakened and unable to mount an aggressive campaign to persuade the U.S. Senate of the importance of ratifying the Treaty of Versailles. His personal physician, Admiral Cary T. Grayson, stated that the President was mentally never the same after the sepsis. Wilson's voiding dysfunction contributed to his inability to win approval for the Treaty of Versailles and the League of Nations. As a result, the United States returned to a policy of isolationism and Europe plunged into 2 decades of upheaval, leading to World War II. Copyright © 2011 American Urological Association Education and Research, Inc. Published by Elsevier Inc. All rights reserved.

  5. The ingenious Mr Hughes: Combining forced, flat, and reverse perspective all in one art piece to pit objects against surfaces

    Science.gov (United States)

    Papathomas, Thomas V; Baker, Nicholas; Yeshua, Arielle S; Zhuang, Xiaohua; Ng, Andrew

    2012-01-01

    The artist Patrick Hughes has ingeniously painted rows of stacked Brillo boxes in Forced into Reverse Perspective. The geometry is in reverse perspective, predicting only one type of illusory motion for each planar surface for moving viewers. He “broke” these surfaces into objects by painting the boxes in three types of perspective (planar, forced, and reverse). Our experiments confirmed that he succeeded in eliciting different types of illusory motion, including “differential motion” between boxes for most viewers. In some sense, this illustrates the superiority of secondary (painted) over primary (physical) cues. PMID:23145280

  6. The Ingenious Mr Hughes: Combining Forced, Fat, and Reverse Perspective All in One Art Piece to Pit Objects against Surfaces

    Directory of Open Access Journals (Sweden)

    Thomas V Papathomas

    2012-04-01

    Full Text Available The artist Patrick Hughes has ingeniously painted rows of stacked Brillo boxes in Forced into Reverse Perspective. The geometry is in reverse perspective, predicting only one type of illusory motion for each planar surface for moving viewers. He “broke” these surfaces into objects by painting the boxes in three types of perspective (planar, forced, and reverse. Our experiments confirmed that he succeeded in eliciting different types of illusory motion, including “differential motion” between boxes for most viewers. In some sense, this illustrates the superiority of secondary (painted over primary (physical cues.

  7. Maurice Hugh Frederick Wilkins CBE: 15 December 1916 - 5 October 2004.

    Science.gov (United States)

    Arnott, Struther; Kibble, T W B; Shallice, Tim

    2006-01-01

    Maurice Hugh Frederick Wilkins was the 'Third man of the double helix; according to the publishers who were allowed to foist this title on his late-written autobiography. Certainly it is for his role in the discover of the duplex secondary structure of DNA that he will be remembered. It might be argued that he was the first man, rather than the third, for it was his successful revival of X-ray diffraction studies of DNA and his earliest result in 1950, a pattern of a well-oriented and polycrystalline DNA of unprecedented quality, that allowed him to conclude almost immediately that the basic framework of the genetical material was simple and symmetrical, and that the symmetrical structure took the form of a helix. This same pattern, displayed at a conference in Naples six months later, was the major inspiration for the involvement of J. D. Watson (ForMemRS 1981) in modelling DNA structure in collaboration with F. H. C. Crick (FRS 1959). Crick was a personal friend of Maurice's and was more involved with studies of proteins until the progress of Maurice's research programme and Watson's enthusiastic presence in Cambridge convinced him to put nucleic acids first. The carefully crafted citation for the 1960 Lasker Award, which these three men shared in 1960, put Maurice's name first and accurately referred to '...the painstaking x-ray diffraction studies of Wilkins that provided a most important clue that was pursued in a ingenious fashion and to a logical conclusion by Crick and Watson...'. Maurice's diffraction studies of DNA were not only the alpha but also the omega of the double helix because it left to him to remedy a major flaw in the original (1953) Watson-Crick conjecture. Maurice Wilkin's early acceptance of DNA as the genetic material and his recognition that it had structures that could and should be tackled by X-ray diffraction analyses, not necessarily under his exclusive control, was important in ensuring that the essence of DNA's structure was

  8. 3 CFR 8381 - Proclamation 8381 of May 15, 2009. National Safe Boating Week, 2009

    Science.gov (United States)

    2010-01-01

    ... should also wear a Coast Guard-approved life jacket and never boat under the influence of drugs or alcohol. These critical precautions can save lives and help ensure a fulfilling experience. Each year...

  9. CNMI, American Samoa, and Guam Small Boat Fishery Trip Expenditure (2009 to present)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This is a time-series dataset of trip expenditure data including actual fishing trip expenses, input usage, and input prices, for boat-based reef fish, bottomfish,...

  10. A quantitative framework for estimating risk of collision between marine mammals and boats

    Science.gov (United States)

    Martin, Julien; Sabatier, Quentin; Gowan, Timothy A.; Giraud, Christophe; Gurarie, Eliezer; Calleson, Scott; Ortega-Ortiz, Joel G.; Deutsch, Charles J.; Rycyk, Athena; Koslovsky, Stacie M.

    2016-01-01

    Speed regulations of watercraft in protected areas are designed to reduce lethal collisions with wildlife but can have economic consequences. We present a quantitative framework for investigating the risk of deadly collisions between boats and wildlife.

  11. Life-threatening neurovascular injuries associated with recreational use of "banana" boats.

    Science.gov (United States)

    Cohen, José E; Moscovici, Samuel; Rosenthal, Guy; Benifla, Mony; Itshayek, Eyal

    2012-09-01

    Banana boat rides are a popular form of recreation worldwide. Recommendations that speed should not exceed 15 mph, passengers should wear protective gear, and an observer should be present on the towing boat are generally ignored. Medical personnel at tourist venues and general practitioners may not be attuned to the risk of serious injury. We present our experience in the management carotid- and vertebral artery dissections sustained by 44- and 23-year-old males during banana boat rides. In both cases, the dissections were misdiagnosed until patients presented to the Emergency Department two days after injury. In the first patient, medical management failed and endovascular treatment was required due to neurological deterioration. In patient two, anticoagulation therapy prevented embolic sequelae. Boat operators, passengers, and the medical personnel who are first to see these patients should be aware of the risk of arterial dissection to facilitate early detection of these potentially life-threatening injuries. Copyright © 2012 Elsevier Ltd. All rights reserved.

  12. Development of Algorithms for Control of Motor Boat as Multidimensional Nonlinear Object

    Directory of Open Access Journals (Sweden)

    Gaiduk Anatoliy

    2015-01-01

    Full Text Available In this paper authors develop and research system for motor boat control, that allows to move along the stated paths with the given speed. It is assumed, that boat is equipped by the measuring system that provides current coordinates, linear and angular velocities. Control system is based upon the mathematical model, presented earlier (see references. In order to analytically find the necessary controls, all equations were transformed to Jordan controllable form. Besides solution this transformation also allows to handle model nonlinearities and get required quality of movement along the stated paths. Control system includes algorithms for control of longtitudal velocity and boat course. Research of the proposed control system according to boat design limitations for the values of control variables was performed by simulation in MATLAB. Results of two experiments, different in value of the required velocity are discussed.

  13. Dielectric properties of fly ash

    Indian Academy of Sciences (India)

    S C Raghavendra; R L Raibagkar; A B Kulkarni

    2002-02-01

    This paper reports the dielectric properties of fly ash. The dielectric measurements were performed as a function of frequency and temperature. The sample of fly ash shows almost similar behaviour in the frequency and temperature range studied. The large value of dielectric constant in the typical frequency range is because of orientation polarization and tight binding force between the ions or atoms in the fly ash. The sample of fly ash is of great scientific and technological interest because of its high value of dielectric constant (104).

  14. Flying over decades

    Science.gov (United States)

    Hoeller, Judith; Issler, Mena; Imamoglu, Atac

    Levy flights haven been extensively used in the past three decades to describe non-Brownian motion of particles. In this presentation I give an overview on how Levy flights have been used across several disciplines, ranging from biology to finance to physics. In our publication we describe how a single electron spin 'flies' when captured in quantum dot using the central spin model. At last I motivate the use of Levy flights for the description of anomalous diffusion in modern experiments, concretely to describe the lifetimes of quasi-particles in Josephson junctions. Finished PhD at ETH in Spring 2015.

  15. Vision in flying insects.

    Science.gov (United States)

    Egelhaaf, Martin; Kern, Roland

    2002-12-01

    Vision guides flight behaviour in numerous insects. Despite their small brain, insects easily outperform current man-made autonomous vehicles in many respects. Examples are the virtuosic chasing manoeuvres male flies perform as part of their mating behaviour and the ability of bees to assess, on the basis of visual motion cues, the distance travelled in a novel environment. Analyses at both the behavioural and neuronal levels are beginning to unveil reasons for such extraordinary capabilities of insects. One recipe for their success is the adaptation of visual information processing to the specific requirements of the behavioural tasks and to the specific spatiotemporal properties of the natural input.

  16. Dredging Effects on Eelgrass (Zostera marina) Distribution in a New England Small Boat Harbor

    Science.gov (United States)

    2005-07-01

    Fonseca, M. (1996). “Light requirements of seagrasses Halodule wrightii and Syringodium filiforme derived from the relationship 30 References between...array of fishes and invertebrates (Thayer et al. 1984, Hughes et al. 2002). Many of these species reach their maximum abundance and biomass in areas

  17. Mode stability analysis in the beam-wave interaction process for a three-gap Hughes-type coupled cavity chain

    Institute of Scientific and Technical Information of China (English)

    Luo Ji-Run; Cui Jian; Zhu Min; Guo Wei

    2013-01-01

    Based on space-charge wave theory,the formulae of the beam-wave coupling coefficient and the beam-loaded conductance are given for the beam-wave interaction in an N-gap Hughes-type coupled cavity chain.The ratio of the nonbeam-loaded quality factor of the coupled cavity chain to the beam quality factor is used to determine the stability of the beam-wave interaction.As an example,the stabilities of the beam-wave interaction in a three-gap Hughes-type coupled cavity chain are discussed with the formulae and the CST code for the operations of the 2π,π,and π/2 modes,respectively.The results show that stable operation of the 2π,π,and π/2 modes may all be realized in an extended-interaction klystron with the three-gap Hughes-type coupled cavity chain.

  18. Fly ash quality and utilization

    Energy Technology Data Exchange (ETDEWEB)

    Barta, L.E.; Lachner, L.; Wenzel, G.B. [Inst. for Energy, Budapest (Hungary); Beer, M.J. [Massachusetts Inst. of Technology, Cambridge, MA (United States)

    1995-12-01

    The quality of fly ash is of considerable importance to fly ash utilizers. The fly ash puzzolanic activity is one of the most important properties that determines the role of fly ash as a binding agent in the cementing process. The puzzolanic activity, however is a function of fly ash particle size and chemical composition. These parameters are closely related to the process of fly ash formation in pulverized coal fired furnaces. In turn, it is essential to understand the transformation of mineral matter during coal combustion. Due to the particle-to-particle variation of coal properties and the random coalescence of mineral particles, the properties of fly ash particles e.g. size, SiO{sub 2} content, viscosity can change considerably from particle to particle. These variations can be described by the use of the probability theory. Since the mean values of these randomly changing parameters are not sufficient to describe the behavior of individual fly ash particles during the formation of concrete, therefore it is necessary to investigate the distribution of these variables. Examples of these variations were examined by the Computer Controlled Scanning Electron Microscopy (CCSEM) for particle size and chemical composition for Texas lignite and Eagel Butte mineral matter and fly ash. The effect of combustion on the variations of these properties for both the fly ash and mineral matter were studied by using a laminar flow reactor. It is shown in our paper, that there are significant variations (about 40-50% around the mean values) of the above-listed properties for both coal samples. By comparing the particle size and chemical composition distributions of the mineral matter and fly ash, it was possible to conclude that for the Texas lignite mineral matter, the combustion did not effect significantly the distribution of these properties, however, for the Eagel Butte coal the combustion had a major impact on these mineral matter parameters.

  19. Physics of flying

    Science.gov (United States)

    Vetrone, Jim

    2015-05-01

    Column editor's note: As the school year comes to a close, it is important to start thinking about next year. One area that you want to consider is field trips. Many institutions require that teachers plan for a field trip well in advance. Keeping that in mind, I asked Jim Vetrone to write an article about the fantastic field trip he takes his AP Physics students on. I had the awesome opportunity to attend a professional development day that Jim arranged at iFLY in the Chicago suburbs. The experience of "flying" in a wind tunnel was fabulous. Equally fun was watching the other physics teachers come up with experiments to have the professional "flyers" perform in the tube. I could envision my students being similarly excited about the experience and about the development of their own experiments. After I returned to school, I immediately began the process of trying to get this field trip approved for the 2015-16 school year. I suggest that you start your process as well if you hope to try a new field trip next year. The key to getting the approval, in my experience, is submitting a proposal early that includes supporting documentation from sources. Often I use NGSS or state standards as justifications for my field trips. I have also quoted College Board expectations for AP Physics 1 and 2 in my documents when requesting an unusual field trip.quote>

  20. CONTROLLING RISK DUE TO NOISE ON FERRY BOAT

    Directory of Open Access Journals (Sweden)

    Aleksandar Nikolic

    2013-07-01

    Full Text Available Environmental and occupational noise is common nuisance that affects the health of employees. Performed health checks of employees engaged by Company “Pomorski Saobraćaj” showed that 5% of examined sailors had hearing loss. The results were a trigger for starting experiment on noise risk assessment with objective to discover possibilities of noise pollution presence, precise significant noise sources and describe solutions for eliminating negative effects. Several measurements on five positions were performed on ferry boat “KAMENARI”, according to EC Physical Agents Directive and Merchant Shipping and Fishing Vessels Regulations 2007. Noise on selected positions exceeded the limit for about 1-5dB. Noise exposure level was 84.5dB. Diesel engine, exhaust system and structural noise were main sources of excessive noise. Experiment shows noise presence as nuisance that affects sailors. Noise presents a serious threat for sailor’s health. It interferes with crew communication and jeopardizes navigation safety. Technical measures, crew health checks and noise monitoring could prevent all negative effects.

  1. The big crossing: illegal boat migrants in the Mediterranean.

    Science.gov (United States)

    Kassar, Hassène; Dourgnon, Paul

    2014-08-01

    This article explores illegal migration routes and groups across North Africa to Europe. We describe sub-Saharan and cross-Mediterranean routes, and how they changed during the years. We propose an analytical framework for the main factors for these migrations, from local to international and regulatory context. We then describe sea-migrants' nationalities and socio-economic and demographic characteristics, from studies undertook in Tunisia and Morocco. While boat migration represents only a fraction of illegal migration to Europe, it raises humanitarian as well as ethical issues for European and North African (NA) countries, as a non-negligible amount of them end up in death tolls of shipwrecks in the Mediterranean Sea. Moreover, existing statistics show that illegal trans-Mediterranean migration is growing exponentially. Ongoing crises in Africa and the Middle East are likely to prompt even larger outflows of refugees in the near future. This should induce NA countries to share closer public policy concerns with European countries.

  2. Refractive Index of Fly Rhabdomeres

    NARCIS (Netherlands)

    Stavenga, D.G.

    1974-01-01

    The refractive index reported previously for the rhabdomeres of flies (1.349) has been corrected for waveguide effects. The presented correction method has yielded n1 = 1.365 ± 0.006. It is argued that an acceptable estimate for the refractive index of the inhomogeneous surroundings of fly

  3. Fitz-Hugh-Curtis综合征在输卵管妊娠和不孕中的发生率及其意义%EXPLORATION ON INCIDENCE OF FITZ-HUGH-CURTIS SYNDROME IN TUBAL PREGNANCY AND TUBAL INFERTILITY

    Institute of Scientific and Technical Information of China (English)

    左绪磊

    2003-01-01

    目的:了解Fitz-Hugh-Curtis综合征在输卵管妊娠和输卵管不孕中的发生率,探讨它们在输卵管妊娠和输卵管不孕发生中的作用.方法:在腹腔镜检查和治疗妇科疾病时,确诊Fitz-Hugh-Curtis综合征遗留的典型病理改变和输卵管周围炎性病变.肿瘤、多囊卵巢综合征、子宫肌瘤等非输卵管炎性疾病患者作为对照组.结果:在109例输卵管妊娠患者中,发现慢性肝周围炎15例(13.8%),升结肠-腹壁粘连10例(9.2%),单纯输卵管周围炎性粘连24例(20.2%).而在112例对照组患者中,发现慢性肝周围炎患者2例(1.8%),升结肠-腹壁粘连患者2例(1.8%),输卵管周围炎性粘连患者2例(1.8%).与对照组相比,输卵管妊娠中肝周围炎发生率明显高于对照组(P<0.01),升结肠-腹壁粘连发生率也高于对照组(P<0.05).在20例经腹腔镜检查诊断为输卵管不孕的患者中,发现肝周围炎5例(25%),未发现升结肠-腹壁粘连.与对照组相比,输卵管性不孕患者中肝周围炎发生率明显高于对照组,差别有极显著意义P<0.001).结论:Fitz-Hugh-Curtis综合征在输卵管妊娠和不孕患者中的发生率与国外接近.肝周围炎、升结肠-腹壁粘连从侧面反映了盆腔炎性疾病在输卵管妊娠和输卵管不孕中起着重要作用.

  4. New Intelligent Method of Forecasting Control for Fishing Boat Security in the Coastal Area of Fujian

    Directory of Open Access Journals (Sweden)

    Wei He

    2012-12-01

    Full Text Available To ensure the fishing boat security in the coastal area of Fujian, it is imperative to develop efficient forecasting control system to manage the boats operation in a safe and orderly process. The core issue of establishing the forecasting control system is to predict the relationship of the real time traffic flow and the boat security condition. However, literature review shows that limited reports have addressed on this problem. Hence, a new intelligent forecasting control method base on the Chaos-Particle Swarm Optimization (PSO and Fuzzy Neural Network (FNN is proposed for the short time traffic flow prediction in this paper. The Empirical Mode Decomposition (EMD was first used to denoise the original ship traffic flow observation and then the Chaos-PSO-FNN was applied to the forecasting of the ship traffic flow and hence established the relationship of the real time traffic flow and the boat security condition. The advantage of the proposed approach is that the Chaos-PSO is employed to optimize the FNN parameters to overcome the premature problem of the FNN. As a result, the forecasting control performance is enhanced greatly. In the experiment analysis, the fishing boat traffic information provided by the Fujian marine bureau has been used to evaluate the newly proposed method. The analysis results demonstrate that the proposed Chaos-PSO-FNN method can extract distinct features of the traffic data and the prediction rate is beyond 93.7%. In addition, it found that the fishing boats is supposed to be safe when their travel time avoids the rush time of the traffic flow. This result agrees well with the real data. Thus, the new intelligent forecasting control method for fishing boat security can be used in practice.

  5. Boats, Borders and the Geo-Imaginaries of the South

    Directory of Open Access Journals (Sweden)

    Francis Maravillas

    2013-02-01

    Full Text Available This paper activates a mode of spatial inquiry into Australia’s identity through an analysis of a number of frames through which the passage and interdiction of boats off the coast of the nation may be viewed. In particular, I explore the way in which Australia’s paradoxical geographical location as South of both the West and Asia play a key role in affixing the horizon within which a conception of the nation and its relationship with the world was – and continues to be – defined and shaped. Moreover, I not only critically probe the constitutive fears and anxieties that underlie bounded conceptions of the trope of the South, but also to examine how such a trope can articulate itself as a site of exchange and negotiation, a distinctive borderland that engenders new cartographies of difference and belonging in an increasingly globalised and interconnected world. I show how these frames overlap and converge on the wider questions of space, place and identity at the very moment when the process of globalisation and migration has done so much to shake any certainties about Australia’s identity as a geographically distinct and spatially bounded nation-state. In so doing, they represent crucial sites for articulating and enacting a transcultural politics of mobility and spatiality that attends to the ways in which the trope of the South may been imagined not as a sphere of containment or an enclaved territory, but as an evolving cartography, the shifting outlines of which opens up new horizons of possibility for rethinking the spatial and temporal coordinates of Australia in a globalizing world.

  6. Boat's hull modeling with low-cost triangulation scanners

    Science.gov (United States)

    Guidi, Gabriele; Micoli, Laura L.; Russo, Michele

    2005-01-01

    In a 3D acquisition project range maps collected around the object to be modeled, need to be integrated. With portable range cameras these range maps are taken from unknown positions and their coordinate systems are local to the sensor. The problem of unifying all the measurements in a single reference system is solved by taking contiguous range maps with a suitable overlap level; taking one map as reference and doing a rototranslation of the adjacent ones by using an "Iterative Closest Point" (ICP) method. Depending on the 3D features over the acquired surface and on the amount of overlapping, the ICP algorithm convergence can be more or less satisfactory. Anyway it always has a random component depending on measurement uncertainty. Therefore, although each individual scan has a very good accuracy, the error's propagation may produce deviations in the aligned set respect to real surface points. In this paper a systematic study of the different alignment modality and the consequent total metric distortions on the final model, is shown. In order to experiment these techniques a case-study of industrial interest was chosen: the 3D modeling of a boat's hull mold. The experiments involved a triangulation based laser scanner integrated with a digital photogrammetry system. In order to check different alignment procedures, a Laser Radar capable to scan all the object surface with a single highly accurate scan, was used to create a "gold-standard" data set. All the experiments were compared with this reference and from the comparison several interesting methodological conclusions have been obtained.

  7. The May 2015 boat crisis: the Rohingya in Aceh

    Directory of Open Access Journals (Sweden)

    Graham Thom

    2016-07-01

    Full Text Available Abstract In May 2015, Indonesia permitted the disembarkation of approximately 1,800 people who had been stranded at sea. The discovery of mass graves in Thailand’s Sadao district, on the border with Malaysia, led to a crack down on people smugglers by the Thai and Malaysian authorities. This saw thousands of Rohingya left stranded at sea as smugglers abandoned their human cargo. While initially pushed back by the Indonesian navy, after being rescued by Indonesian fishermen the Rohingya, on the three boats rescued, were permitted to stay in Indonesia’s Aceh province and seek protection. As part of an Amnesty International research team, conducting research in Aceh in August 2015, our aim was to document the reasons driving the Rohingya to leave Myanmar and Bangladesh, the human rights abuses they experienced at sea and the conditions they are experiencing in Aceh. The subsequent Amnesty International report primarily documented the abuses suffered by those on board the smuggling/trafficking vessels. It also highlighted a number of issues now facing those allowed to remain in Aceh (Amnesty International, 2015. This article will further examine the human rights situation facing the Rohingya in Aceh, why they have been treated differently from previous Rohingya groups who have arrived in Aceh and the ongoing sustainability of the current model. Significantly, the majority of those that arrived have subsequently escaped from the “sites”[1], having again engaged smugglers to reach Malaysia. Given that a process already exists for refugees arriving in Indonesia, the differing treatment received by the Rohingya arriving in May 2015 raises a number of questions. This paper will conclude that the current situation is not sustainable and the treatment of refugees in Aceh should be included in a broader national approach commensurate to the treatment of refugees and asylum seekers throughout Indonesia. [1] Rather than detention centres or camps, the

  8. Roll Control in Fruit Flies

    CERN Document Server

    Beatus, Tsevi; Cohen, Itai

    2014-01-01

    Due to aerodynamic instabilities, stabilizing flapping flight requires ever-present fast corrective actions. Here we investigate how flies control body roll angle, their most susceptible degree of freedom. We glue a magnet to each fly, apply a short magnetic pulse that rolls it in mid-air, and film the corrective maneuver. Flies correct perturbations of up to $100^{\\circ}$ within $30\\pm7\\mathrm{ms}$ by applying a stroke-amplitude asymmetry that is well described by a linear PI controller. The response latency is $\\sim5\\mathrm{ms}$, making the roll correction reflex one of the fastest in the animal kingdom.

  9. Wave Motion Compensation Scheme and Its Model Tests for the Salvage of An Ancient Sunken Boat

    Institute of Scientific and Technical Information of China (English)

    YE Jia-wei; CHEN Yuan-ming; WANG Dong-jiao; LIU Yue-qin; SONG Xin; HUANG Yuan-tian

    2006-01-01

    The application of the vertical hoisting jack and wave motion compensation techniques to the salvage of an ancient sunken boat is introduced. The boat is wooden, loaded with cultural relics. It has been immersed at the bottom of the South China Sea for more than 800 years. In order to protect the structure of the boat and the cultural relics inside to the largest extent, an open caisson is used to hold the sunken boat and the silts around before they are raised from the seabed all together as a whole. In the paper, first, the seakeeping model test of the system of the salvage barge and the open caisson is done to determine some important wave response parameters. And then a further experimental study of the application of the vertical hoisting jack and wave motion compensation scheme to the salvage of the sunken boat is carried out. In the model tests, the techniques of the integrative mechanic-electronic-hydraulic control, wave motion forecast and wave motion compensation are used to minimize the heave motion of the open caisson. The results of the model tests show that the heave motion of the open caisson can be reduced effectively by the use of the present method.

  10. Cross Matching of VIIRS Boat Detection and Vessel Monitoring System Tracks

    Science.gov (United States)

    Hsu, F. C.; Elvidge, C.; Zhizhin, M. N.; Baugh, K.; Ghosh, T.

    2016-12-01

    One approach to commercial fishing is to use use bright lights at night to attract catch. This is a widely used practice in East and Southeast Asia, but can also be found in other fisheries. In some cases, the deployed lighting exceeds 100,000 watts. Such lighting is distinctive in dark ocean and can even be seen from space with sensor such as Visible Infrared Imaging Radiometer Suite Day/Night Band (VIIRS-DNB). We have developed a VIIRS Boat Detection (VBD) system, which outputs lists of boat locations in near real time. One of the standard methods fishery agencies use to collect geospatial data on fishing boats is to require boats to carry Vessel Monitoring System beacons. We developed an algorithm to cross-match VBD data with VMS tracks. With this we are able to identify fishing boats that do not carry VMS beacons. In certain situations, this is an indicator of illegal fishing. The other application for this cross-matching is to define the VIIRS detection limits and developing a calibration to estimate deployed wattage. Here we demonstrate results of cross matching VBD and VMS for Indonesia as example to showcase its potential.

  11. Design of Hybrid Solar and Wind Energy Harvester for Fishing Boat

    Science.gov (United States)

    Banjarnahor, D. A.; Hanifan, M.; Budi, E. M.

    2017-07-01

    In southern beach of West Java, Indonesia, there are many villagers live as fishermen. They use small boats for fishing, in one to three days. Therefore, they need a fish preservation system. Fortunately, the area has high potential of solar and wind energy. This paper presents the design of a hybrid solar and wind energy harvester to power a refrigerator in the fishing boat. The refrigerator should keep the fish in 2 - 4 °C. The energy needed is 720 Wh daily. In the area, the daily average wind velocity is 4.27 m/s and the sun irradiation is 672 W/m2. The design combined two 100W solar panels and a 300W wind turbine. The testing showed that the solar panels can harvest 815 - 817 Wh of energy, while the wind turbine can harvest 43 - 62 Wh of energy daily. Therefore, the system can fulfil the energy requirement in fishing boat, although the solar panels were more dominant. To install the wind turbine on the fishing-boat, a computational design had been conducted. The boat hydrostatic dimension was measured to determine its stability condition. To reach a stable equilibrium condition, the wind turbine should be installed no more than 1.7 m of height.

  12. Design of a semi-autonomous boat for measurements of coastal sedimentation and erosion

    Science.gov (United States)

    Smith, D.; Cross, L.; Rivet, J.; Hall, S.

    2015-03-01

    Measurement of sediment deposition and erosion in coastal areas is a challenge due to soft shifting sediments, but is critical to assessing loss or restoration of coastal sediments and wetlands. The aim of this project was to design and construct a semi-autonomous boat with water depth measuring capabilities. It was intended to map the depth of coastal wetlands to determine erosion rates and assess coastal restoration effects. Depth-measuring equipment was incorporated into an autonomous pontoon boat powered by solar panels. The propulsion system consisted of two paddlewheels and two-way motors to allow movement and positioning for measurements. Modifications included a lightweight, hard coating on the pontoons and powder-coating the frame to extend their usable life. A microcontroller controlled the boat and captured depth data from sensors and location data with a GPS system. The depth measuring system consisted of a pulley and counter system that completed each measurement in less than 45 seconds. This allowed the boat to take approximately 400 measurements per day. Net accuracy was approximately 3 cm in the tested configuration. The boat can continually measure the depth of specified areas in the wetlands; with this data, the change in depth can be monitored to see the effects of restoration projects.

  13. Positive Intervention for Serious Behavior Problems: Best Practices in Implementing the Hughes Bill (A.B. 2586) and the Positive Behavioral Intervention Regulations.

    Science.gov (United States)

    Wright, Diana Browning; Gurman, Harvey B.

    This manual provides guidelines to educators attempting to comply with California's Hughes Bill, which is intended to ensure the rights of special education students to have positive behavioral intervention plans designed to bring lasting behavioral changes without interventions that cause pain or trauma. An introductory chapter summarizes the…

  14. Influence of spatially modified tissue on atrial fibrillation patterns: Insight from solutions of the FitzHugh-Nagumo equations

    CERN Document Server

    Lenk, Claudia; Maass, Philipp

    2010-01-01

    We study the interplay between traveling action potentials and spatial inhomogeneities in the FitzHugh-Nagumo model to investigate possible mechanisms for the occurrence of fibrillatory states in the atria of the heart. Different dynamical patterns such as ectopic foci, localized and meandering spiral waves are found depending on the characteristics of the inhomogeneities. Their appearance in dependence of the size and strength of the inhomogeneities is quantified by phase diagrams. Furthermore it is shown that regularly paced waves in a region R, that is connected by a small bridge connection to another region L with perturbing waves emanating from an additional pacemaker, can be strongly disturbed, so that a fibrillatory state emerges in region R after a transient time interval. This finding supports conjectures that fibrillatory states in the right atrium can be induced by self-excitatory pacemakers in the left atrium.

  15. Frédéric Sylvanise. Langston Hughes, poète jazz, poète blues

    Directory of Open Access Journals (Sweden)

    Hélène CHRISTOL

    2011-03-01

    Full Text Available La Renaissance de Harlem a été redécouverte en France au début du XXIe siècle, grâce à l’organisation de manifestations publiques et universitaires ainsi que la publication de nombreuses études qui « revisitent » la période et les œuvres de ses écrivains et de ses artistes.  L’ouvrage de Frédéric Sylvanise, Langston Hughes, poète jazz, poète blues, publié par les éditions de l’ENS en 2009, apporte sa pierre à cet édifice critique puisqu’il se penche sur certains recueils de poésie de cet écri...

  16. Stability Switches and Hopf Bifurcation in a Coupled FitzHugh-Nagumo Neural System with Multiple Delays

    Directory of Open Access Journals (Sweden)

    Shengwei Yao

    2014-01-01

    Full Text Available A FitzHugh-Nagumo (FHN neural system with multiple delays has been proposed. The number of equilibrium point is analyzed. It implies that the neural system exhibits a unique equilibrium and three ones for the different values of coupling weight by employing the saddle-node bifurcation of nontrivial equilibrium point and transcritical bifurcation of trivial one. Further, the stability of equilibrium point is studied by analyzing the corresponding characteristic equation. Some stability criteria involving the multiple delays and coupling weight are obtained. The results show that the neural system exhibits the delay-independence and delay-dependence stability. Increasing delay induces the stability switching between resting state and periodic activity in some parameter regions of coupling weight. Finally, numerical simulations are taken to support the theoretical results.

  17. Managing the Fruit Fly Experiment.

    Science.gov (United States)

    Jeszenszky, Arleen W.

    1997-01-01

    Describes a sophisticated version of the fruit fly experiment for teaching concepts about genetics to biology students. Provides students with the opportunity to work with live animals over an extended period. (JRH)

  18. Quantitative proteomics on the fly

    NARCIS (Netherlands)

    Gouw, J.W.

    2009-01-01

    The development of multicellular organisms is characterized by complex processes that progressively transform essentially a single cell into a creature with complicated structures and highly specialized functions. The fruit fly Drosophila melanogaster provides an excellent model system to investigat

  19. Subtropical Fruit Fly Invasions into Temperate Fruit Fly Territory in California's San Joaquin Valley

    Science.gov (United States)

    Subtropical fruit fly species including peach fruit fly, Bactrocera zonata (Saunders); melon fly, B. cucurbitae (Coquillett); oriental fruit fly, B. dorsalis (Hendel); and Mediterranean fruit fly, Ceratitis capitata Weidemann, have been detected in the past decade in the San Joaquin Valley of Califo...

  20. Flying in Two Dimensions

    CERN Document Server

    Prakash, Manu

    2011-01-01

    Diversity and specialization of behavior in insects is unmatched. Insects hop, walk, run, jump, row, swim, glide and fly to propel themselves in a variety of environments. We have uncovered an unusual mode of propulsion of aerodynamic flight in two dimensions in Waterlilly Beetles \\emph{(Galerucella)}. The adult beetles, often found in water lilly ponds, propel themselves strictly in a two-dimensional plane on the surface of water via flapping wing flight. Here we analyze the aerodynamics of this peculiar flight mode with respect to forces exerted on the organism during flight. The complexity of 2-D flight is captured by accounting for additional forces beyond gravitational, thrust, lift and drag, exerted on the insect body in 3D flight. Understanding this constrained propulsion mode requires accounting for viscous drag, surface tension, buoyancy force, and capillary-wave drag. Moreover, dramatic differences exist in the magnitude of the resultant forces in 2D vs. 3D flight. Here, in this fluid dynamics video...

  1. Fly ash. Quality recycling material

    Energy Technology Data Exchange (ETDEWEB)

    Blomster, D.; Leisio, C.

    1996-11-01

    Imatran Voima`s coal-fired power plants not only generate power and heat but also produce fly ash which is suitable raw material for recycling. This material for recycling is produced in the flue gas cleaning process. It is economical and, thanks to close quality control, is suitable for use as a raw material in the building materials industry, in asphalt production, and in earthworks. Structures made from fly ash are also safe from an environmental point of view. (orig.)

  2. Fly ash. Quality recycling material

    Energy Technology Data Exchange (ETDEWEB)

    Blomster, D.; Leisio, C.

    1996-11-01

    Imatran Voima`s coal-fired power plants not only generate power and heat but also produce fly ash which is suitable raw material for recycling. This material for recycling is produced in the flue gas cleaning process. It is economical and, thanks to close quality control, is suitable for use as a raw material in the building materials industry, in asphalt production, and in earthworks. Structures made from fly ash are also safe from an environmental point of view. (orig.)

  3. Research and development of Ro-boat: an autonomous river cleaning robot

    Science.gov (United States)

    Sinha, Aakash; Bhardwaj, Prashant; Vaibhav, Bipul; Mohommad, Noor

    2013-12-01

    Ro-Boat is an autonomous river cleaning intelligent robot incorporating mechanical design and computer vision algorithm to achieve autonomous river cleaning and provide a sustainable environment. Ro-boat is designed in a modular fashion with design details such as mechanical structural design, hydrodynamic design and vibrational analysis. It is incorporated with a stable mechanical system with air and water propulsion, robotic arms and solar energy source and it is proceed to become autonomous by using computer vision. Both "HSV Color Space" and "SURF" are proposed to use for measurements in Kalman Filter resulting in extremely robust pollutant tracking. The system has been tested with successful results in the Yamuna River in New Delhi. We foresee that a system of Ro-boats working autonomously 24x7 can clean a major river in a city on about six months time, which is unmatched by alternative methods of river cleaning.

  4. Screening of antifouling biocides around a pleasure boat marina in the Baltic Sea after legal restrictions.

    Science.gov (United States)

    Kylin, Henrik; Haglund, Kurt

    2010-10-01

    Copper, zinc, and Irgarol 1051 concentrations were determined around a pleasure boat marina in the Stockholm Archipelago. Copper concentrations in water were twice as high (6.62 μg L⁻¹) in 2004 as 1992-1993, zinc concentrations six times higher (20.0 μg L⁻¹). Concentrations in bladder wrack (Fucus vesiculosus) had also risen. Irgarol concentrations in water were similar (~0.17 μg L⁻¹) in 1996 and 2004, while concentrations in bladder wrack halved from 1993 to 2004. The peak concentrations of copper and Irgarol in water have shifted indicating that the main source in the 1990 s were local boats, but in 2004 visiting boats.

  5. Air-gap effect on life boat arrangement for a semi-submersible FPU

    Directory of Open Access Journals (Sweden)

    Mun-Sung Kim

    2016-09-01

    In this paper, we have been performed the numerical studies to find proper arrangement for the life boats consider drop height in various environmental conditions such as wave, wind and current. In the calculations, the contributions from static and low frequency (LF motions are considered from the hydrodynamic and mooring analysis as well as damage angle from the intact and damage stability analysis. Also, Air-gap calculation at the life boat positions has been carried out to check the effect on the life boat arrangement. The air-gap assessment is based on the extreme air-gap method includes the effect of 1st order wave frequency (WF motions, 2nd order low frequency roll/pitch motion, static trim/heel and set down.

  6. THEORETICAL AND EXPERIMENTAL INVESTIGATION OF GAIN SCHEDULING AND ADAPTIVE AUTOPILOTS FOR A MODEL BOAT

    Directory of Open Access Journals (Sweden)

    M. MURALI KRISHNA,

    2011-02-01

    Full Text Available In this paper Gain scheduling PD controller and Adaptive PD controller are adopted as autopilot systems for a boat model. The control design is based on Nomoto’s first order mathematical model. Adaptive controller is based on model reference adaptive controller theory. Similar test runs are conducted on a model boat with the above controller algorithms. The effectiveness of the two controllers are compared numerically and graphically. The results show that both controllers are well for reaching the desired heading angle. The adaptive controller has some notable advantage over gain scheduling controller.

  7. 26 CFR 31.3401(a)(17)-1 - Remuneration for services performed on a boat engaged in catching fish.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 15 2010-04-01 2010-04-01 false Remuneration for services performed on a boat... Remuneration for services performed on a boat engaged in catching fish. (a) Remuneration for services performed... receive, any cash remuneration, other than remuneration that is described in subparagraph (1) of...

  8. 40 CFR Table 1 to Subpart Vvvv of... - Compliance Dates for New and Existing Boat Manufacturing Facilities

    Science.gov (United States)

    2010-07-01

    ... Boat Manufacturing Facilities 1 Table 1 to Subpart VVVV of Part 63 Protection of Environment... Manufacturing Pt. 63, Subpt. VVVV, Table 1 Table 1 to Subpart VVVV of Part 63—Compliance Dates for New and Existing Boat Manufacturing Facilities As specified in § 63.5695, you must comply by the dates in...

  9. 77 FR 15006 - Special Local Regulations; Third Annual Space Coast Super Boat Grand Prix, Atlantic Ocean, Cocoa...

    Science.gov (United States)

    2012-03-14

    ... SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulations; Third Annual Space Coast... of the Atlantic Ocean east of Cocoa Beach, Florida during the Third Annual Space Coast Super Boat Grand Prix, a series of high-speed boat races. The event is scheduled to take place on Sunday, May...

  10. 33 CFR 150.505 - When must the operator service and examine lifeboat and rescue boat release gear?

    Science.gov (United States)

    2010-07-01

    ... inspection by personnel trained in examining the gear. Inflatable Lifesaving Appliances ... and examine lifeboat and rescue boat release gear? 150.505 Section 150.505 Navigation and Navigable... and examine lifeboat and rescue boat release gear? (a) The operator must service lifeboat and...

  11. 19 CFR 10.36a - Vehicles, pleasure boats and aircraft brought in for repair or alteration.

    Science.gov (United States)

    2010-04-01

    ... RATE, ETC. General Provisions Temporary Importations Under Bond § 10.36a Vehicles, pleasure boats and... shall be without surety or cash deposit except as provided by this paragraph and paragraph (d) of this... supported by bond with surety or cash deposit in lieu of surety. (b) Each vehicle, pleasure boat,...

  12. A epistemologia de Hugh Lacey em diálogo com a Economia Feminista: neutralidade, objetividade e pluralismo Hugh Lacey's epistemology dialogs with feminist economy: neutrality, objectivity and pluralism

    Directory of Open Access Journals (Sweden)

    Brena Paula Magno Fernandez

    2008-08-01

    Full Text Available A Economia Feminista é um dos mais recentes programas de pesquisa em ciência econômica. Desde a publicação de Beyond Economic Man, organizado por Marianne Ferber e Julie Nelson,¹ ele vem se desenvolvendo com crescente força, sobretudo nos Estados Unidos. Entretanto, a pesquisa feminista, em geral, e a economia feminista, em particular, são freqüentemente consideradas como menos objetivas do que as pesquisas tradicionais, e isso porque estas últimas seriam livres de valores, enquanto as primeiras não. Após traçar algumas definições centrais da Economia Feminista, propomos, a partir do modelo crítico de Hugh Lacey,² que: i almejar a objetividade não significa defender uma metodologia isenta de influências valorativas, ii a neutralidade é (e deve ser defensável para o conjunto da prática científica e, finalmente, iii a defesa da pluralidade de abordagens científicas é o meio através do qual a neutralidade da ciência como uma prática social pode ser salvaguardada.Feminist Economics is one of the most recent research programs in economic science. Since the publication of Beyond Economic Man, edited by Ferber and Nelson (1993, it has been developed with increasing strength, especially in the United States. However, feminist researches in general and feminist economics in particular are often perceived to be less objective than conventional research, on the grounds that the latter would be value-neutral and the former would not. After drawing up some central definitions of Feminist Economics, we follow Hugh Lacey's critical model (1998, 1999 and propose that: i to aim for objectivity does not mean to defend a methodology that is free from axiological influences, ii neutrality is (and ought to be defensible for scientific practice as a whole, and finally, iii the defense of a plurality of scientific approaches is the way through which the neutrality of science as a social practice can be safeguarded.

  13. Fiber optics that fly

    Science.gov (United States)

    Wilcox, Michael J.; Thelen, Donald C., Jr.

    1996-11-01

    The need for autonomous systems to work under unanticipated conditions requires the use of smart sensors. High resolution systems develop tremendous computational loads. Inspiration from animal vision systems can guide us in developing preprocessing approaches implementable in real time with high resolution and deduced computational load. Given a high quality optical path and a 2D array of photodetectors, the resolution of a digital image is determined by the density of photodetectors sampling the image. In order to reconstruct an image, resolution is limited by the distance between adjacent detectors. However, animal eyes resolve images 10-100 times better than either the acceptance angle of a single photodetector or the center-to-center distance between neighboring photodetectors. A new model of the fly's visual system emulates this improved performance, offering a different approach to subpixel resolution. That an animal without a cortex is capable of this performance suggests that high level computation is not involved. The model takes advantage of a photoreceptor cell's internal structure for capturing light. This organelle is a waveguide. Neurocircuitry exploits the waveguide's optical nonlinearities, namely in the shoulder region of its gaussian sensitivity-profile, to extract high resolution information from the visual scene. The receptive fields of optically disparate inputs overlap in space. Photoreceptor input is continuous rather than discretely sampled. The output of the integrating module is a signal proportional to the position of the target within the detector array. For tracking a point source, resolution is 10 times better than the detector spacing. For locating absolute position and orientation of an edge, the model performs similarly. Analog processing is used throughout. Each element is an independent processor of local luminance. Information processing is in real time with continuous update. This processing principle will be reproduced in an

  14. Fly-in/Fly-out: Implications for Community Sustainability

    Directory of Open Access Journals (Sweden)

    Keith Storey

    2010-04-01

    Full Text Available “Fly-in/fly-out” is a form of work organization that has become the standard model for new mining, petroleum and other types of resource development in remote areas. In many places this “no town” model has replaced that of the “new town.” The work system has both beneficial and adverse implications for the sustainability of both existing communities near new resource developments and for the more distant communities from which workers are drawn. This paper explores these outcomes drawing upon examples from North America and Australia.

  15. 77 FR 18689 - Changes to Standard Numbering System, Vessel Identification System, and Boating Accident Report...

    Science.gov (United States)

    2012-03-28

    ..., Federal, State, and local law enforcement personnel use SNS information from the States' numbering systems... enforcement personnel use SNS information from the States' numbering systems for enforcement of boating laws... Standard Numbering System (SNS), the Vessel Identification System, and accident reporting; require...

  16. Stone sculptures of goddesses on the boats from Goa, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Gaur, A; Kerkar, R.

    goddess panels. A few sculptures reflect influence of folk art traditions in Goa. On the basis of lion figures in a few sculptured panels indicate that these boat motifs must have been engraved during the Kadamba period (10 th - 13 th) when Goa witnessed...

  17. Operational Energy Capability Portfolio Analysis for Protection of Maritime Forces Against Small Boat Swarms

    Science.gov (United States)

    2016-09-01

    visualization features, is geared at improving “the tactical awareness and defensive posture of ships defending against terrorist attacks in port...escort mission taking place in the Strait of Gibraltar. This strait is chosen as a small boat 14 terrorist attack on two merchant vessels took place

  18. Motion induced passenger dislocations in life raft and life boat configurations

    NARCIS (Netherlands)

    Bos, J.E.; Andersen ,O.; Reinke, P.

    2010-01-01

    Within the European project SafeCrafts, dealing with the safe abandoning of ships, the dislocation of passengers aboard life boats and rafts has been considered to be a risk regarding passenger survival at sea. To get an idea about the risks and the affecting factors involved, we studied the effects

  19. Aliens in Paradise. Boat density and exotic coastal mollusks in Moorea Island (French Polynesia).

    Science.gov (United States)

    Ardura, Alba; Planes, Serge; Garcia-Vazquez, Eva

    2015-12-01

    Pacific islands are particularly vulnerable to the effects of invasive species. After habitat destruction or modification, invasive species are responsible for more biological extinctions than any other cause. Further, the rate of extinction of native species has been higher on islands than anywhere else in the world. Invasive species have also degraded native ecosystems. In order to detect exotic intertidal mollusk species, an extensive sampling around Moorea Island, a more or less unspoiled island surrounded by a rich coral reef habitat, has been developed considering that sampled points have different characteristics in wave exposure, algae coverage, type of substrate, distance to ports, distance to freshwater, distance sewage and boat traffic. Samples were DNA barcoded for unequivocal species assignation. The presence of five NIS among 26 species seems an important signal of introduction of alien biota in Moorea Island coast. However they were represented by a total of 38 individuals among 1487 mollusks (2.55%). While the distance to relatively big ports influenced directly species richness, the intensity of maritime traffic measured as boat density near sampling points was significantly associated with the frequency of exotic species. Other environmental factors did not show significant correlation with the frequency of exotics, suggesting that in an environment without big discontinuities, with little habitat modification, local boat traffic is the most influential factor in the spread of exotic species. This could be mitigated relatively easily by reducing boat density in local zones of ecological interest. Copyright © 2015 Elsevier Ltd. All rights reserved.

  20. 33 CFR 100.111 - Stonington Lobster Boat Races, Stonington, ME.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Stonington Lobster Boat Races, Stonington, ME. 100.111 Section 100.111 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY REGATTAS AND MARINE PARADES SAFETY OF LIFE ON NAVIGABLE WATERS § 100.111 Stonington Lobster...

  1. 33 CFR 100.110 - World's Fastest Lobster Boat Race, Jonesport, ME.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false World's Fastest Lobster Boat Race, Jonesport, ME. 100.110 Section 100.110 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY REGATTAS AND MARINE PARADES SAFETY OF LIFE ON NAVIGABLE WATERS § 100.110 World's Fastest...

  2. 75 FR 43823 - Safety Zone; He'eia Kea Small Boat Harbor, Kaneohe Bay, Oahu, HI

    Science.gov (United States)

    2010-07-27

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; He'eia Kea Small Boat Harbor, Kaneohe Bay, Oahu, HI AGENCY: Coast Guard, DHS. ACTION: Temporary Final Rule. SUMMARY: The Coast Guard...

  3. BOAT: automatic alignment of biomedical ontologies using term informativeness and candidate selection.

    Science.gov (United States)

    Chua, Watson Wei Khong; Kim, Jung-Jae

    2012-04-01

    The biomedical sciences is one of the few domains where ontologies are widely being developed to facilitate information retrieval and knowledge sharing, but there still remains the problem that applications using different ontologies cannot share knowledge without explicit references between overlapping concepts. Ontology alignment is the task of identifying such equivalence relations between concepts across ontologies. Its application to the biomedical domain should address two open issues: (1) determining the equivalence of concept-pairs which have overlapping terms in their names, and (2) the high run-time required to align large ontologies which are typical in the biomedical domain. To address them, we present a novel approach, named the Biomedical Ontologies Alignment Technique (BOAT), which is state-of-the-art in terms of F-measure, precision and speed. A key feature of BOAT is that it considers the informativeness of each component word in the concept labels, which has significant impact on biomedical ontologies, resulting in a 12.2% increase in F-measure. Another important feature of BOAT is that it selects for comparison only concept pairs that show high likelihoods of equivalence, based on the similarity of their annotations. BOAT's F-measure of 0.88 for the alignment of the mouse and human anatomy ontologies is on par with that of another state-of-the-art matcher, AgreementMaker, while taking a shorter time.

  4. Simple Verification of the Parabolic Shape of a Rotating Liquid and a Boat on Its Surface

    Science.gov (United States)

    Sabatka, Z.; Dvorak, L.

    2010-01-01

    This article describes a simple and inexpensive way to create and to verify the parabolic surface of a rotating liquid. The liquid is water. The second part of the article deals with the problem of a boat on the surface of a rotating liquid. (Contains 1 table, 10 figures and 5 footnotes.)

  5. 'We get nothing from fishing' : Fishing for boat opportunities amongst Senegalese fisher migrants

    NARCIS (Netherlands)

    Nyamnjoh, Henrietta Mambo

    2010-01-01

    The world is regularly confronted in the media with dramatic images of African boat migrants. Seemingly desperate, these Africans, most of them males, are willing to risk a perilous journey at sea, hoping for a better life in Europe. And, even worse, hundreds more are believed to die each year, swal

  6. Simple Verification of the Parabolic Shape of a Rotating Liquid and a Boat on Its Surface

    Science.gov (United States)

    Sabatka, Z.; Dvorak, L.

    2010-01-01

    This article describes a simple and inexpensive way to create and to verify the parabolic surface of a rotating liquid. The liquid is water. The second part of the article deals with the problem of a boat on the surface of a rotating liquid. (Contains 1 table, 10 figures and 5 footnotes.)

  7. The boat people of Vietnam. Rescue on the South China Sea.

    Science.gov (United States)

    Hayes, T J; Thomas, D; Dewar, E P

    1990-01-01

    Poor economic conditions in Vietnam have encouraged large numbers of people seeking a better life in the West to join the flow of political refugees leaving the country as "boat people". We report the events surrounding one such group of people who were rescued from the South China Sea by the Outback 88 Task Group.

  8. 'We get nothing from fishing' : Fishing for boat opportunities amongst Senegalese fisher migrants

    NARCIS (Netherlands)

    Nyamnjoh, Henrietta Mambo

    2010-01-01

    The world is regularly confronted in the media with dramatic images of African boat migrants. Seemingly desperate, these Africans, most of them males, are willing to risk a perilous journey at sea, hoping for a better life in Europe. And, even worse, hundreds more are believed to die each year,

  9. The use of vascular plants as traditional boat raw material by Yachai tribe in Mappi Regency

    Directory of Open Access Journals (Sweden)

    YOHANES YOSEPH RAHAWARIN

    2005-07-01

    Full Text Available This research is executed aim to know the plant species and the way of exploiting permanent wood upon which traditional boat making by Yachai tribe in Mappi regency. The Method that used in this research is descriptive method with the structural semi interview technique and direct perception in field. Result of research indicate that the tribe Yachai exploit the plant species have permanent wood upon which traditional boat as much 26 species from 14 family. There are 8 wood species which is often used for the body of boat and also own the good quality according to Yachai tribe, that is Atam (Scihizomeria serrata Hochr, Batki (Adinandra forbesii Baker. F, Chomach (Gordonia papuana Kobuski, Rupke (Tristania sp., Bao (Dillenia papuana artelli, Top (Buchanania macrocarpa Laut, Mitbo (Cordia Dichtoma Forst., and Yunun (Camnosperma brevipetiolata Volkens. While to part of oar exploit 2 wood species that is Bach (Buchanania Arborescens.Bi and Tup (Litsea ampala Merr. Yachai Tribe recognized 3 boat model owning different size measure and function, that is Junun Ramchai, Junun Pochoi and Junun Toch.

  10. Industrial wastes from the boat-building sector in the Marche Region (Italy): a parametric and chemical-physical characterization.

    Science.gov (United States)

    Carchesio, M; Tatàno, F; Tosi, G; Trivellone, C H

    2013-01-01

    Using the renowned leisure boat-building sector in the Marche Region (Italy) as a case-study, this paper addresses the characterization of (1) the industrial waste generation from the building of composite material-based boats and (2) some chemical-physical properties of representative types of boat-building residues (plastic foam, hardened resin, fibre-reinforced composite residues, and sanding dust). A parametric evaluation based on the number of employees gave a representative unit generation rate per employee (UGRpE) of 1.47 tons(waste) employee(-1) year(-1) for the entire Marche regional boatbuilding district, whereas evaluations carried out separately for three case-study companies provided values of 1.56, 3.07, and 1.12 tons(waste) employee(-1) year(-1) as representative for a mass-produced motor boat builder (case-study company '1'), a customized sailing boat builder (case-study company '2'), and a mould and structural component builder (case-study company '3'), respectively. The original proposal and evaluation of two additional generation rates based on physical characteristics intrinsic to the manufactured product, i.e. the unit generation rate per boat area (UGRpA) and per boat weight (UGRpW), confirmed the higher waste generation for the sailing boat builder(representative UGRpA and UGRpW values of 0.35 tons(waste) m(-2)(boat) year(-1) and 2. 71 tons(waste) tons(-1)(boat) year(-1), respectively) compared with the motor boat builder (representative UGRpA and UGRpW values of 0.06 tons(waste) m(-2)(boat) year(-1) and 0.49 tons(waste) tons(-1)(boat) year(-1), respectively). The chemical-physical property characterization of the selected residues revealed the following aspects: a general condition of low moisture contents; significant ash contents in the glass- and carbon-fibre composite residues and the correlated sanding dust; and relatively high energy content values in the overall range 14,144-32,479 kJ kg(-1), expressed as the lower heating value.

  11. Escherichia coli fliAZY operon.

    OpenAIRE

    Mytelka, D S; Chamberlin, M J

    1996-01-01

    We have cloned the Escherichia coli fliAZY operon, which contains the fliA gene (the alternative sigma factor sigma F) and two novel genes, fliZ and fliY. Transcriptional mapping of this operon shows two start sites, one of which is preceded by a canonical E sigma F-dependent consensus and is dependent on sigma F for expression in vivo and in vitro. We have overexpressed and purified sigma F and demonstrated that it can direct core polymerase to E sigma F-dependent promoters. FliZ and FliY ar...

  12. Application of Laminated Veneer Lumber (LVL on the Wooden Boat Construction

    Directory of Open Access Journals (Sweden)

    Ahmad Basuki Widodo

    2012-02-01

    Full Text Available LVL (Laminated-Veneer Lumber has many advantages and economic values, which is important for wooden boat construction. The recovery of veneer, the main material of LVL, are higher than sawn-timber and their drying process are faster. LVL produced with a continuous press has been approved as an engineered material with reliable strength and stiffness. In a wooden boat processing, the easy forming into a curve shape and strength are main factor, because of the streamline shape of boats. LVL material is able to meet those requirements. As an endless-length LVL is made from a log limited-length hence LVL always contain joints. Butt joint have numerous drawbacks, but they are inherently simple and less time to manufacture than other joints types. The purposes of this experiment are to investigate the basic characteristics of LVL which are important for deck and hull planking in the wooden boat constructions. Yellow meranti and red meranti were peeled by a veneer lathe and phenol formaldehyde adhesive were used. Result of experiment indicated that at the position 0o (β, the flexibility and strength of LVL up to proportional limit increased with increasing number of layer and spacing of butt-joint (d/t. LVL at the position 45o and 90o (β, all types of LVL had lower flexibility and strength than the standard value for deck and hull planking. In bending experiment test speciment at position 45° with direction of grain, maximum width of LVL equal to the spacing of frame and at position 90° equal to the width of hull planking in wooden boat. Based on the interpretations of the above results, it can be concluded that (1. LVL of 9, 6 and 4 plies with upside (inside veneer butt-joint is appropriate for deck and hull planking in wooden boat manufacturing, (2. LVL of 9, 6 and 4 plies with spacing of butt-joint (d/t more than 20 is appropriate for deck and hull planking in manufacturing wooden boat.

  13. Vibrational and Stochastic Resonance in the FitzHugh-Nagumo Neural Model with Multiplicative and Additive Noise

    Institute of Scientific and Technical Information of China (English)

    HE Zheng-You; ZHOU Yu-Rong

    2011-01-01

    The vibrational resonance and stochastic resonance phenomena in the FitzHugh-Nagumo (FHN) neural model,driven by a high-frequency (HF) signal and a low-frequency (LF) signal and by coupled multiplicative and additive noises,is investigated.For the case that the frequency of the HF signal is much higher than that of the LF signal,under the adiabatic approximation condition,the expression of the signal-to-noise ratio (SNR) with respect to the LF signal is obtained.It is shown that the SNR is a non-monotonous function of the amplitude and frequency of the HF signal In addition,the SNR varies non-monotonically with the increasing intensities of the multiplicative and additive noise as well as with the increasing system parameters of the FHN model The influence of the coupling strength between the multiplicative and additive noises on the SNR is discussed.Stochastic resonance (SR) describes the phenomenon where an appropriate amount of noise is of constructive use in the sense that a weak signal becomes amplified upon harvesting the ambient noise in nonlinear systems.[1] Since its first discovery in the early eighties,SR has been observed in a great variety of systems pertaining to different disciplines such as physics,chemistry,engineering,biology and biomedical sciences.[1-4] The phenomenon vibrational resonance (VR) was named by Landa and McClintock.[5]%The vibrational resonance and stochastic resonance phenomena in the FitzHugh-Nagumo (FHN) neural model, driven by a high-frequency (HF) signal and a low-frequency (LF) signal and by coupled multiplicative and additive noises, is investigated. For the case that the frequency of the HF signal is much higher than that of the LF signal, under the adiabatic approximation condition, the expression of the signal-to-noise ratio (SNR) with respect to the LF signal is obtained. It is shown that the SNR is a non-monotonous function of the amplitude and frequency of the HF signal. In addition, the SNR varies non

  14. Dermatobia, the neotropical warble fly.

    Science.gov (United States)

    Sancho, E

    1988-09-01

    The neotropical warble fly, Dermatobia hominis (Fig. 1), has plagued neotropical America since preColombian times, and has become an economically important pest causing substantial losses to the meat, milk and leather industries from northern Mexico down to northern Argentina. Its life cycle (Box 1) is astonishingly complex, requiring another insect as a phoretic carrier of its eggs to the skin of its mammal hosts. Here Eugenio Sancho discusses factors that contribute to the current economic and public health importance of this myiasis-causing fly.

  15. Susceptibility of low-chill blueberry cultivars to Mediterranean fruit fly, oriental fruit fly, and melon fly (Diptera: Tephritidae).

    Science.gov (United States)

    Follett, Peter A; Zee, Francis T; Hamasaki, Randall T; Hummer, Kim; Nakamoto, Stuart T

    2011-04-01

    No-choice tests were conducted to determine whether fruit of southern highbush blueberry, Vaccinium corymbosum L., hybrids are hosts for three invasive tephritid fruit flies in Hawaii. Fruit of various blueberry cultivars was exposed to gravid female flies of Bactrocera dorsalis Hendel (oriental fruit fly), Ceratitis capitata (Wiedemann) (Mediterranean fruit fly), or Bactrocera cucurbitae Coquillet (melon fly) in screen cages outdoors for 6 h and then held on sand in the laboratory for 2 wk for pupal development and adult emergence. Each of the 15 blueberry cultivars tested were infested by oriental fruit fly and Mediterranean fruit fly, confirming that these fruit flies will oviposit on blueberry fruit and that blueberry is a suitable host for fly development. However, there was significant cultivar variation in susceptibility to fruit fly infestation. For oriental fruit fly, 'Sapphire' fruit produced an average of 1.42 puparia per g, twice as high as that of the next most susceptible cultivar 'Emerald' (0.70 puparia per g). 'Legacy', 'Biloxi', and 'Spring High' were least susceptible to infestation, producing only 0.20-0.25 oriental fruit fly puparia per g of fruit. For Mediterranean fruit fly, 'Blue Crisp' produced 0.50 puparia per g of fruit, whereas 'Sharpblue' produced only 0.03 puparia per g of fruit. Blueberry was a marginal host for melon fly. This information will aid in development of pest management recommendations for blueberry cultivars as planting of low-chill cultivars expands to areas with subtropical and tropical fruit flies. Planting of fruit fly resistant cultivars may result in lower infestation levels and less crop loss.

  16. Evaluation of ADCP apparent bed load velocity in a large sand-bed river: Moving versus stationary boat conditions

    Science.gov (United States)

    Jamieson, E.C.; Rennie, C.D.; Jacobson, R.B.; Townsend, R.D.

    2011-01-01

    Detailed mapping of bathymetry and apparent bed load velocity using a boat-mounted acoustic Doppler current profiler (ADCP) was carried out along a 388-m section of the lower Missouri River near Columbia, Missouri. Sampling transects (moving boat) were completed at 5- and 20-m spacing along the study section. Stationary (fixed-boat) measurements were made by maintaining constant boat position over a target point where the position of the boat did not deviate more than 3 m in any direction. For each transect and stationary measurement, apparent bed load velocity (vb) was estimated using ADCP bottom tracking data and high precision real-time kinematic (RTK) global positioning system (GPS). The principal objectives of this research are to (1) determine whether boat motion introduces a bias in apparent bed load velocity measurements; and (2) evaluate the reliability of ADCP bed velocity measurements for a range of sediment transport environments. Results indicate that both high transport (vb>0.6 m/s) and moving-boat conditions (for both high and low transport environments) increase the relative variability in estimates of mean bed velocity. Despite this, the spatially dense single-transect measurements were capable of producing detailed bed velocity maps that correspond closely with the expected pattern of sediment transport over large dunes. ?? 2011 American Society of Civil Engineers.

  17. Isolamento e caracterização de Pseudomonas maltophilia (Hugh & Ryschenkow, 1960 de material clínico humano, na cidade do Rio de Janeiro Isolating and characterization of Pseudomonas maltophilia (Hugh & Ryschenkow, 1960 from human clinical specimens, in Rio de Janeiro, Guanabara, Brazil

    Directory of Open Access Journals (Sweden)

    Altair A. Zebral

    1973-01-01

    Full Text Available Os autores estudaram as propriedades morfo-bioquímicas e a sensibilidade às substâncias antimicrobianas, de uma nova e rara espécie de Pseudomonas, a Pseudomonas maltophilia (Hugh & Ryschenkow, 1960, isolada de secração vaginal. Como características marcantes, dentre mais de 65 testadas, as amostras estudadas mostraram ser: oxidase negativa e lisina descarboxilase positiva; produziram desoxiribonuclease e um pigmento escuro que se difunde no meio; atacaram oxidativamente a maltose tanto em meio complexo nitrogenado como em meio de Hugh & Leifson e hidrolisaram a esculina. As amostras foram sensíveis ao cloranfenicol, gentamicina, kanamicina, colistin e gabromicina.The authors have studied the morpho-biochemical properties and the sensibility at antimicrobial drugs, of specie of Pseudomonas, the Pseudomonas maltophilia, (Hugh & Ryschenkow, 1960, isolated from vaginal secretion. Since important characteristics among more of sixty-five tested, the strains studied show to be: oxidase negative and lysine decarboxylase positive; to present deoxyrononuclease activity and produced a diffusible brown pigment: acid was produced by oxidation of maltose as much in nitrogenous complex medium as in Hugh & Leifson medium and they hydrolise the esculin. the strains was sensible, for the colistin chloranfenicol, gabromycin, gentamycin and nalidix acid.

  18. A fuzzy 'boater' model to detect fouling and spreading risk of non-indigenous species by recreational boats.

    Science.gov (United States)

    Ferrario, Jasmine; Marchini, Agnese; Borrelli, Paola; Gigli Berzolari, Francesca; Occhipinti-Ambrogi, Anna

    2016-11-01

    Recreational boating is an unregulated and underestimated vector of spread of non-indigenous species (NIS) in marine environments. The risk of a single boat to spread NIS depends not only on the local environmental context, but also on the type of boat and on the boat owner's behaviour (hull cleaning and painting frequency, travel history). In this paper we present a model to assess the risk of fouling and spreading of NIS and its application to data derived from a questionnaire given to Italian boat owners. The model uses a two-levels fuzzy logic approach: (1) the first level assesses the risk of hull fouling and risk of spreading separately; (2) the second level combines the two separate risks in an overall index ranging from 0 (null risk) to 100 (highest risk) and measures the global risk of NIS introduction and spread through recreational boating. The questionnaire and the fuzzy model allow for a simple and rapid assessment of boats most likely to be infested. The proposed fuzzy model can be easily edited and adapted to context-specific ecological and social conditions. The results of this Italian study showed that 53.9% of the respondents were in the very-low and low risk categories, and 46.1% in the medium, high and very-high risk categories. Possible associations between some boaters habits and the fouling and spreading risk were explored using logistic regression analyses. The results indicate a high-risk profile of boat owner as an experienced sailor who visits many marinas during the summer season. Biosecurity guidelines, containment measures and awareness raising programmes should be implemented to prevent and avoid further spread of NIS in marine environments, and such management actions would benefit from the early detection of high-risk boats, and from the identification of profiles of boaters upon which these initiatives should be prioritized. Copyright © 2016 Elsevier Ltd. All rights reserved.

  19. Fruit Flies Help Human Sleep Research

    Science.gov (United States)

    Skip Navigation Bar Home Current Issue Past Issues Fruit Flies Help Human Sleep Research Past Issues / Summer 2007 ... courtesy of NIGMS Neuroscientist Chiara Cirelli uses experimental fruit flies to study sleep. Although it may be tough ...

  20. Fitz-Hugh-Curtis综合征的腹腔镜诊断及病原菌研究

    Institute of Scientific and Technical Information of China (English)

    姜海燕; 于宏艳; 殷丽华; 姚常晖

    2006-01-01

    Fitz-Hugh-Curtis综合征(FHCS)是盆腔炎合并肝周围炎,诊断需依据直视下观察肝表面和盆腔脏器的炎症表现,和(或)直接从肝表面、盆腔脏器表面检出病原菌,因此受条件限制有许多困难。我们充分利用腹腔镜的探查功能使本病的诊断变得容易。以往报道FHCS病原菌为淋球菌,随着沙眼衣原体感染的急剧增加,本病的报道亦日见增多,由此对其病原菌也提出了质疑。所以本研究拟用腹腔镜协助诊断FHCS及其病原菌,以指导临床诊断与治疗。

  1. Synchronization of coupled different chaotic FitzHugh-Nagumo neurons with unknown parameters under communication-direction-dependent coupling.

    Science.gov (United States)

    Iqbal, Muhammad; Rehan, Muhammad; Khaliq, Abdul; Saeed-ur-Rehman; Hong, Keum-Shik

    2014-01-01

    This paper investigates the chaotic behavior and synchronization of two different coupled chaotic FitzHugh-Nagumo (FHN) neurons with unknown parameters under external electrical stimulation (EES). The coupled FHN neurons of different parameters admit unidirectional and bidirectional gap junctions in the medium between them. Dynamical properties, such as the increase in synchronization error as a consequence of the deviation of neuronal parameters for unlike neurons, the effect of difference in coupling strengths caused by the unidirectional gap junctions, and the impact of large time-delay due to separation of neurons, are studied in exploring the behavior of the coupled system. A novel integral-based nonlinear adaptive control scheme, to cope with the infeasibility of the recovery variable, for synchronization of two coupled delayed chaotic FHN neurons of different and unknown parameters under uncertain EES is derived. Further, to guarantee robust synchronization of different neurons against disturbances, the proposed control methodology is modified to achieve the uniformly ultimately bounded synchronization. The parametric estimation errors can be reduced by selecting suitable control parameters. The effectiveness of the proposed control scheme is illustrated via numerical simulations.

  2. Synchronization of Coupled Different Chaotic FitzHugh-Nagumo Neurons with Unknown Parameters under Communication-Direction-Dependent Coupling

    Directory of Open Access Journals (Sweden)

    Muhammad Iqbal

    2014-01-01

    Full Text Available This paper investigates the chaotic behavior and synchronization of two different coupled chaotic FitzHugh-Nagumo (FHN neurons with unknown parameters under external electrical stimulation (EES. The coupled FHN neurons of different parameters admit unidirectional and bidirectional gap junctions in the medium between them. Dynamical properties, such as the increase in synchronization error as a consequence of the deviation of neuronal parameters for unlike neurons, the effect of difference in coupling strengths caused by the unidirectional gap junctions, and the impact of large time-delay due to separation of neurons, are studied in exploring the behavior of the coupled system. A novel integral-based nonlinear adaptive control scheme, to cope with the infeasibility of the recovery variable, for synchronization of two coupled delayed chaotic FHN neurons of different and unknown parameters under uncertain EES is derived. Further, to guarantee robust synchronization of different neurons against disturbances, the proposed control methodology is modified to achieve the uniformly ultimately bounded synchronization. The parametric estimation errors can be reduced by selecting suitable control parameters. The effectiveness of the proposed control scheme is illustrated via numerical simulations.

  3. Effect of spatially correlated noise on stochastic synchronization in globally coupled FitzHugh-Nagumo neuron systems

    Directory of Open Access Journals (Sweden)

    Yange Shao

    2014-01-01

    Full Text Available The phenomenon of stochastic synchronization in globally coupled FitzHugh-Nagumo (FHN neuron system subjected to spatially correlated Gaussian noise is investigated based on dynamical mean-field approximation (DMA and direct simulation (DS. Results from DMA are in good quantitative or qualitative agreement with those from DS for weak noise intensity and larger system size. Whether the consisting single FHN neuron is staying at the resting state, subthreshold oscillatory regime, or the spiking state, our investigation shows that the synchronization ratio of the globally coupled system becomes higher as the noise correlation coefficient increases, and thus we conclude that spatial correlation has an active effect on stochastic synchronization, and the neurons can achieve complete synchronization in the sense of statistics when the noise correlation coefficient tends to one. Our investigation also discloses that the noise spatial correlation plays the same beneficial role as the global coupling strength in enhancing stochastic synchronization in the ensemble. The result might be useful in understanding the information coding mechanism in neural systems.

  4. Pulse propagation and failure in the discrete FitzHugh-Nagumo model subject to high-frequency stimulation.

    Science.gov (United States)

    Ratas, Irmantas; Pyragas, Kestutis

    2012-10-01

    We investigate the effect of a homogeneous high-frequency stimulation (HFS) on a one-dimensional chain of coupled excitable elements governed by the FitzHugh-Nagumo equations. We eliminate the high-frequency term by the method of averaging and show that the averaged dynamics depends on the parameter A=a/ω equal to the ratio of the amplitude a to the frequency ω of the stimulating signal, so that for large frequencies an appreciable effect from the HFS is attained only at sufficiently large amplitudes. The averaged equations are analyzed by an asymptotic theory based on the different time scales of the recovery and excitable variables. As a result, we obtain the main characteristics of a propagating pulse as functions of the parameter A and derive an analytical criterion for the propagation failure. We show that depending on the parameter A, the HFS can either enhance or suppress pulse propagation and reveal the mechanism underlying these effects. The theoretical results are confirmed by numerical simulations of the original system with and without noise.

  5. The Spider and the Fly

    Science.gov (United States)

    Mellinger, Keith E.; Viglione, Raymond

    2012-01-01

    The Spider and the Fly puzzle, originally attributed to the great puzzler Henry Ernest Dudeney, and now over 100 years old, asks for the shortest path between two points on a particular square prism. We explore a generalization, find that the original solution only holds in certain cases, and suggest how this discovery might be used in the…

  6. Electrodialytic treatment of fly ash

    DEFF Research Database (Denmark)

    Jensen, Pernille Erland; Pedersen, Anne Juul; Kirkelund, Gunvor Marie

    Heavy metals are removed from the fly ashes by an electrodialytic treatment with the aim of up-grading the ashes for reuse in stead of disposal in landfill.A great potential for upgrading of bio- and waste incineration ashes by electrodialytic treatment exists. In the future, the applicability...

  7. DURABILITY OF HARDENED FLY ASH PASTE

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    The mechanical properties and durability ( mainly frost-resistance and carbonation resistance ) of fly ash-CaO-CaSO4 .2H2O hardened paste are studied. The relationship among durability of harden ed fly ash paste, the quantity and distribution of hydrates and the initial p aste texture of hardened fly ash paste is presented.

  8. Louse flies on birds of Baja California.

    Science.gov (United States)

    Tella, J L; Rodríguez-Estrella, R; Blanco, G

    2000-01-01

    Louse flies were collected from 401 birds of 32 species captured in autumn of 1996 in Baja California Sur (Mexico). Only one louse fly species (Microlynchia pusilla) was found. It occurred in four of the 164 common ground doves (Columbina passerina) collected. This is a new a host species for this louse fly.

  9. Flies and Campylobacter infection of broiler flocks

    DEFF Research Database (Denmark)

    Hald, Birthe; Skovgård, Henrik; Bang, Dang Duong

    2004-01-01

    A total of 8.2% of flies caught outside a broiler house in Denmark had the potential to transmit Campylobacter jejuni to chickens, and hundreds of flies per day passed through the ventilation system into the broiler house. Our study suggests that flies may be an important source of Campylobacter...

  10. FliO Regulation of FliP in the Formation of the Salmonella enterica Flagellum

    OpenAIRE

    Barker, Clive S.; Meshcheryakova, Irina V.; Kostyukova, Alla S.; Samatey, Fadel A.

    2010-01-01

    The type III secretion system of the Salmonella flagellum consists of 6 integral membrane proteins: FlhA, FlhB, FliO, FliP, FliQ, and FliR. However, in some other type III secretion systems, a homologue of FliO is apparently absent, suggesting it has a specialized role. Deleting the fliO gene from the chromosome of a motile strain of Salmonella resulted in a drastic decrease of motility. Incubation of the ΔfliO mutant strain in motility agar, gave rise to pseudorevertants containing extrageni...

  11. 南舟北移背景下京杭运河城市龙舟品牌赛事发展研究%On the dragon boat brand development with the background of Southern boats expanding North

    Institute of Scientific and Technical Information of China (English)

    张永虎

    2015-01-01

    Southern boats expanding north is the most powerful measure to prompt the development of dragon boats in China.Regarding canal city's dragon boat races as the research object,using the method of literature,field survey and interview,the dragon boat competition's situation,characteristics and existing problems are analyzed.By using the SWOT analysis theory,based on the research of its superiorities,weaknesses,opportunities and threats to develop the dragon boat brand competition,the development strategy of the dragon boat brand competition is put forward,specifically including:spread the dragon boat sports events and inherit and innovate dragon boating culture;perfect the mechanism and implement the commercial operation;rise the intensity of colleges and universities'races and make the dragon boat culture research;hold the canal city dragon boat club's super league competition,build the brand and so on,in order to further promote China's Dragon Boat Sport healthy and orderly development.%“南舟北移”成为驱动我国龙舟项目普及发展最强有力的举措。以京杭运河城市龙舟赛事为研究对象,运用文献资料、田野调查和访谈法,对当今龙舟赛事现状、特性和存在的问题进行了分析。借用SWOT分析理论,在对发展龙舟品牌赛事面临的优势、劣势、机遇和威胁进行研究的基础上,提出龙舟品牌赛事的开发策略,具体包括:推广龙舟运动,传承与创新龙舟文化;健全机制,实施商业化运作;推进高校龙舟开展力度,做好龙舟文化研究;举办运河城市龙舟俱乐部超级联赛,打造赛事品牌等,力求推动我国龙舟运动健康有序发展。

  12. FliO Regulation of FliP in the Formation of the Salmonella enterica Flagellum

    Science.gov (United States)

    Barker, Clive S.; Meshcheryakova, Irina V.; Kostyukova, Alla S.; Samatey, Fadel A.

    2010-01-01

    The type III secretion system of the Salmonella flagellum consists of 6 integral membrane proteins: FlhA, FlhB, FliO, FliP, FliQ, and FliR. However, in some other type III secretion systems, a homologue of FliO is apparently absent, suggesting it has a specialized role. Deleting the fliO gene from the chromosome of a motile strain of Salmonella resulted in a drastic decrease of motility. Incubation of the ΔfliO mutant strain in motility agar, gave rise to pseudorevertants containing extragenic bypass mutations in FliP at positions R143H or F190L. Using membrane topology prediction programs, and alkaline phosphatase or GFPuv chimeric protein fusions into the FliO protein, we demonstrated that FliO is bitopic with its N-terminus in the periplasm and C-terminus in the cytoplasm. Truncation analysis of FliO demonstrated that overexpression of FliO43–125 or FliO1–95 was able to rescue motility of the ΔfliO mutant. Further, residue leucine 91 in the cytoplasmic domain was identified to be important for function. Based on secondary structure prediction, the cytoplasmic domain, FliO43–125, should contain beta-structure and alpha-helices. FliO43–125-Ala was purified and studied using circular dichroism spectroscopy; however, this domain was disordered, and its structure was a mixture of beta-sheet and random coil. Coexpression of full-length FliO with FliP increased expression levels of FliP, but coexpression with the cytoplasmic domain of FliO did not enhance FliP expression levels. Overexpression of the cytoplasmic domain of FliO further rescued motility of strains deleted for the fliO gene expressing bypass mutations in FliP. These results suggest FliO maintains FliP stability through transmembrane domain interaction. The results also demonstrate that the cytoplasmic domain of FliO has functionality, and it presumably becomes structured while interacting with its binding partners. PMID:20941389

  13. FliO regulation of FliP in the formation of the Salmonella enterica flagellum.

    Directory of Open Access Journals (Sweden)

    Clive S Barker

    2010-09-01

    Full Text Available The type III secretion system of the Salmonella flagellum consists of 6 integral membrane proteins: FlhA, FlhB, FliO, FliP, FliQ, and FliR. However, in some other type III secretion systems, a homologue of FliO is apparently absent, suggesting it has a specialized role. Deleting the fliO gene from the chromosome of a motile strain of Salmonella resulted in a drastic decrease of motility. Incubation of the ΔfliO mutant strain in motility agar, gave rise to pseudorevertants containing extragenic bypass mutations in FliP at positions R143H or F190L. Using membrane topology prediction programs, and alkaline phosphatase or GFPuv chimeric protein fusions into the FliO protein, we demonstrated that FliO is bitopic with its N-terminus in the periplasm and C-terminus in the cytoplasm. Truncation analysis of FliO demonstrated that overexpression of FliO₄₃-₁₂₅ or FliO₁-₉₅ was able to rescue motility of the ΔfliO mutant. Further, residue leucine 91 in the cytoplasmic domain was identified to be important for function. Based on secondary structure prediction, the cytoplasmic domain, FliO₄₃-₁₂₅, should contain beta-structure and alpha-helices. FliO₄₃-₁₂₅-Ala was purified and studied using circular dichroism spectroscopy; however, this domain was disordered, and its structure was a mixture of beta-sheet and random coil. Coexpression of full-length FliO with FliP increased expression levels of FliP, but coexpression with the cytoplasmic domain of FliO did not enhance FliP expression levels. Overexpression of the cytoplasmic domain of FliO further rescued motility of strains deleted for the fliO gene expressing bypass mutations in FliP. These results suggest FliO maintains FliP stability through transmembrane domain interaction. The results also demonstrate that the cytoplasmic domain of FliO has functionality, and it presumably becomes structured while interacting with its binding partners.

  14. Aerodynamics of the Smallest Flying Insects

    CERN Document Server

    Miller, Laura A; Hedrick, Ty; Robinson, Alice; Santhanakrishnan, Arvind; Lowe, Audrey

    2011-01-01

    We present fluid dynamics videos of the flight of some of the smallest insects including the jewel wasp, \\textit{Ampulex compressa}, and thrips, \\textit{Thysanoptera} spp. The fruit fly, \\textit{Drosophila melanogaster}, is large in comparison to these insects. While the fruit fly flies at $Re \\approx 120$, the jewel wasp flies at $Re \\approx 60$, and thrips flies at $Re \\approx 10$. Differences in the general structures of the wakes generated by each species are observed. The differences in the wakes correspond to changes in the ratio of lift forces (vertical component) to drag forces (horizontal component) generated.

  15. 77 FR 38077 - Notice of Intent To Prepare an Environmental Impact Statement on a Proposed Boat-House Facility...

    Science.gov (United States)

    2012-06-26

    ...-House Facility for Non-Motorized Boats, George Washington Memorial Parkway AGENCY: National Park Service... Impact Statement (EIS) to assess the impacts of constructing a boathouse facility and floating docks...

  16. Environmental assessment of proposed dredging and disposal activities at the St. George small boat harbor, reconnaissance stage: Planning aid report

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Types of environmental impacts possibly resulting from dredging and disposal activities at the St. George Island small boat harbor include: 1) bottom topographic and...

  17. Analysis of X-band calibrated sea clutter and small boat reflectivity at medium-to-low grazing angles

    CSIR Research Space (South Africa)

    Herselman, PL

    2008-11-01

    Full Text Available , allows the development of advanced detection and tracking algorithms, which will improve the performance of surveillance and marine navigation radar against small boats. Work presented is based on the empirical analysis of data recorded with two...

  18. A Study of the Response of Eastern Spiny Softshell Turtle to Boat Traffic in the Missisquoi River of Northern Vermont

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of this study was to gauge the degree to which boat traffic in the Missisquoi River affects the basking behavior of the eastern spiny softshell turtle...

  19. Psychosocial experiences of breast cancer survivors involved in a dragon boat program: exploring links to positive psychological growth.

    Science.gov (United States)

    Sabiston, Catherine M; McDonough, Meghan H; Crocker, Peter R E

    2007-08-01

    This study explored psychosocial experiences of breast cancer survivors involved in dragon boat programs. Twenty women (M(age) = 58.69, SD = 6.85) were interviewed for 45-60 min about their experiences as members of survivor dragon boat teams. Interviews were analyzed using constructivist grounded theory methods. The dragon boat program facilitated social support from women with common challenges and a shared understanding of survivorship. It also provided opportunities to (re)gain a sense of personal control, develop new identities as athletes, and overcome physical challenges. Together these elements contributed to positive psychological growth and linked to the literature on posttraumatic growth. Future physical activity interventions targeting breast cancer survivors may benefit from developing strategies that share key characteristics of dragon boating.

  20. An assessment of waterbird populations wintering in Port Frederick, Chichagof Island, Alaska, 19-23 February 1982: Boat surveys

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Information is presented on the waterbird population of Port Frederick, Chichagof Island, Alaska, as revealed by small boat surveys during February 1982. The...

  1. Binocular interactions underlying the classic optomotor responses of flying flies

    Directory of Open Access Journals (Sweden)

    Brian J Duistermars

    2012-02-01

    Full Text Available In response to imposed course deviations, the fast optomotor reactions of animals reduce motion blur and facilitate the maintenance of stable body posture. In flies, the monocular front-to-back (progressive and back-to-front (regressive visual motion components generated by horizontal rotation are selectively encoded, respectively, by homo and heterolateral motion sensitive circuits in the third optic ganglion, the lobula plate. To investigate the strength of such inter-ocular interactions and their role in compensatory sensory-motor transformations, we utilize a virtual reality flight simulator to record optomotor reactions by tethered flying flies in response to imposed binocular and monocular visual rotation. With stimulus parameters generating large contrast insensitive optomotor responses to binocular rotation, we find that responses to monocular progressive motion are larger than those to panoramic rotation but contrast sensitive. Conversely, responses to monocular regressive motion are slower than those to rotation and peak at the lowest tested contrast. Together our results suggest that contrast insensitive optomotor responses to binocular rotation result from the dynamic interplay of contralateral inhibitory as well as excitatory circuit interactions and serve to maintain a stable optomotor equilibrium across a range of visual contrasts.

  2. Experimental investigation on stern-boat deployment system and operability for Korean coast guard ship

    Directory of Open Access Journals (Sweden)

    Ho Hwan Chun

    2012-12-01

    Full Text Available The stern boat deployment system was investigated to evaluate the capability of launching and recovering rigid hull inflatable boat (RHIB via the stern ramp. The main parameters to launch and recover RHIB were tested at the design stage. The combined hydrodynamic effect of the stern wake and the water jet flow made it difficult to maintain the maneuvering and sea-keeping ability of RHIB approaching to the stern ramp. The safe recovery course was proposed to maintain the directional control of RHIB and to reduce the combined hydrodynamic effect in the transom zone. To evaluate the feasibility of RHIB recovery, the stern sill depth was measured in various conditions and the ramp availability time was obtained. Also, the experimental percent time operability (PTO test was performed by the number of successive launching and recovering operations.

  3. Effect of bow spray strips and Ω-type freeboard on high-speed boats

    Directory of Open Access Journals (Sweden)

    WEI Chengzhu

    2017-01-01

    Full Text Available A high-speed boat may encounter severe wave-making at the bow and become wetter at high speed. Some measures can be taken to overcome these disadvantages. In order to compare the effect of bow spray strips and Ω-type freeboards on a high-speed boat, hull wetness, resistance, hull motion, stability and the restoring moment of the heel at high speed of models with these two kinds of auxiliaries were calculated and measured. CFD methods and model tests were adopted. Both of these two auxiliaries can reduce hull wetness, and the model with a Ω-type freeboard has a better initial stability and larger restoring moment of the heel at high speed. A free running model test also indicates that the Ω-type freeboard has a fine performance.

  4. Variance of discharge estimates sampled using acoustic Doppler current profilers from moving boats

    Science.gov (United States)

    Garcia, Carlos M.; Tarrab, Leticia; Oberg, Kevin; Szupiany, Ricardo; Cantero, Mariano I.

    2012-01-01

    This paper presents a model for quantifying the random errors (i.e., variance) of acoustic Doppler current profiler (ADCP) discharge measurements from moving boats for different sampling times. The model focuses on the random processes in the sampled flow field and has been developed using statistical methods currently available for uncertainty analysis of velocity time series. Analysis of field data collected using ADCP from moving boats from three natural rivers of varying sizes and flow conditions shows that, even though the estimate of the integral time scale of the actual turbulent flow field is larger than the sampling interval, the integral time scale of the sampled flow field is on the order of the sampling interval. Thus, an equation for computing the variance error in discharge measurements associated with different sampling times, assuming uncorrelated flow fields is appropriate. The approach is used to help define optimal sampling strategies by choosing the exposure time required for ADCPs to accurately measure flow discharge.

  5. Hypolipidemic and Antioxidant Effects of Malus toringoides (Rehd.) Hughes Leaves in High-Fat-Diet-Induced Hyperlipidemic Rats.

    Science.gov (United States)

    Huang, Shan; Liu, Haifeng; Meng, Ning; Li, Bin; Wang, Jule

    2017-03-01

    Malus toringoides (Rehd.) Hughes (MT) leaves are traditionally used as a medicine for treating or preventing cardiovascular disease in Tibet. In addition to the effect of this medicinal plant on thrombosis, we tested its effect on dyslipidemia in a hypolipidemic rat model. A total of 60 healthy Sprague-Dawley rats were randomly divided into six groups, as follows: normal control, model control, simvastatin groups, and MT low-, medium-, and high-dose groups. The normal controls were fed with a normal diet, whereas all other groups were fed with a high-fat diet. After 6 weeks, the high-fat diet had induced hyperlipidemia in the rats, which were then orally administered with different doses of MT leaf extract (50, 100, and 200 mg/kg) for an additional 6 weeks. Serum levels of total cholesterol (TC), triglycerides (TG), low- and high-density lipoprotein cholesterol (LDL-c and HDL-c, respectively), as well as the antioxidant capacity of glutathione peroxidase (GSHP-x), superoxide dismutase (SOD), and malondialdehyde (MDA) were measured at the end of the study. MT significantly reduced serum TC, TG, and LDL-c and increased the HDL-c content in MT-treated rats compared with the model group. These changes were dose dependent. MT treatment also significantly elevated the activity of SOD and GSHP-x, and decreased the serum levels of MDA compared with untreated hyperlipidemic rats, thereby increasing serum antioxidant capacity. In addition, MT reduced liver steatosis in hyperlipidemic rats. Overall, MT exerts considerable hypolipidemic and antioxidant properties.

  6. Mean-field description and propagation of chaos in networks of Hodgkin-Huxley and FitzHugh-Nagumo neurons.

    Science.gov (United States)

    Baladron, Javier; Fasoli, Diego; Faugeras, Olivier; Touboul, Jonathan

    2012-05-31

    We derive the mean-field equations arising as the limit of a network of interacting spiking neurons, as the number of neurons goes to infinity. The neurons belong to a fixed number of populations and are represented either by the Hodgkin-Huxley model or by one of its simplified version, the FitzHugh-Nagumo model. The synapses between neurons are either electrical or chemical. The network is assumed to be fully connected. The maximum conductances vary randomly. Under the condition that all neurons' initial conditions are drawn independently from the same law that depends only on the population they belong to, we prove that a propagation of chaos phenomenon takes place, namely that in the mean-field limit, any finite number of neurons become independent and, within each population, have the same probability distribution. This probability distribution is a solution of a set of implicit equations, either nonlinear stochastic differential equations resembling the McKean-Vlasov equations or non-local partial differential equations resembling the McKean-Vlasov-Fokker-Planck equations. We prove the well-posedness of the McKean-Vlasov equations, i.e. the existence and uniqueness of a solution. We also show the results of some numerical experiments that indicate that the mean-field equations are a good representation of the mean activity of a finite size network, even for modest sizes. These experiments also indicate that the McKean-Vlasov-Fokker-Planck equations may be a good way to understand the mean-field dynamics through, e.g. a bifurcation analysis.Mathematics Subject Classification (2000): 60F99, 60B10, 92B20, 82C32, 82C80, 35Q80.

  7. "We are all in the same boat" - ISEE leaders' trip to China

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ The motto of Tongji University, whose name literallymeans "we are all in the same boat, and must work to-gether to reach common goals", describes the harvest ofISEE leaders' mission to China in May 2007. ISEE Presi-dent Joan Martinez-Alier, President-Elect Peter May andthe society's founder and first President, Robert Costanzaas well as ISEE member Robert Ayres, participated in aseries of events and meetings in Shanghai and Beijing witha view to build institutional collaboration.

  8. Development of Fluorescence Imaging Lidar for Boat-Based Coral Observation

    Directory of Open Access Journals (Sweden)

    Sasano Masahiko

    2016-01-01

    Full Text Available A fluorescence imaging lidar system installed in a boat-towable buoy has been developed for the observation of reef-building corals. Long-range fluorescent images of the sea bed can be recorded in the daytime with this system. The viability of corals is clear in these fluorescent images because of the innate fluorescent proteins. In this study, the specifications and performance of the system are shown.

  9. The Intrusion of Engine Exhaust into the Passenger Areas of Recreational Power Boats

    Science.gov (United States)

    1991-07-01

    Annapolis, Maryland. The test boat was a 34-foot Silverton sedan cruiser equipped with twin 302 CID engines with exhaust exits located on each side of the...40.60 30.14 1.42 09:36:31 51.80 41.90 30.14 2.74 -001 -000 -@00 @00 test oeat: 361 Silverton Sedan Cruiser 19:27:01 51.30 42.70 30.14 1.53 *forever

  10. METHODOLOGY OF THE HYBRID PROPULSION SYSTEM (DMP & DEP FOR TRIMARAN TYPE FAST PATROL BOAT

    Directory of Open Access Journals (Sweden)

    Aulia Widyandari

    2012-04-01

    Full Text Available There are lot of research done to develop a patrol boat, from the modification of hull model until propulsion system equipment. For example the model ship type AMV (Advanced Marine Vehicle was developed starting from the Catamaran, Trimaran and  Pentamaran model. Everything is aimed at obtaining the ship design that has the speed and stability. In addition to achieving high-speed vessel must be equipped with propulsion (Main Power is great, that means the main engine dimensions, auxiliary equipments and fuel tanks is too large. Many Limitations of space on the ship's engine room trimaran vessel is the main obstacle in designing propulsion system. Beside that Patrol boat should have many missions speed, so propulsion system should be designed at that conditions.   Hybrid propulsion is a combination of Diesel Mechanical Propulsion (DMP with Diesel Electric Propulsion (DEP. DMP system is connected directly to the propeller shaft (or through a reduction-gear. DMP has provide more efficiency rate of 95%. While DEP is only able to provide efficiency by 85% - 89% is slightly lower than DMP, but the DEP offers many advantages such as simplicity and suitability in the rotational speed settings, control systems, engine power production Redundancy, Flexibility in the design of equipments layout in engine rooms, noise, vibration and fuel consumption efficiency which affects the lower pollution.   Design of Hybrid Propulsion system can be satisfied and achieved the Power requirements and optimally at all speed condition of patrol boat. Therefore the author made using modeling Maxsurf-11.12 software and carried out various optimization of the choice of main engine, propeller and system conditions for fast patrol boat cruise. 

  11. Boat Pumpout Locations, Fresh Water Boat Ramps in Rhode Island; Rs44ofr95; Public ramps and launching areas for boats and small craft on fresh water rivers streams lakes and ponds, Published in 1995, 1:24000 (1in=2000ft) scale, State of Rhode Island and Providence Plantations.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Boat Pumpout Locations dataset, published at 1:24000 (1in=2000ft) scale, was produced all or in part from Hardcopy Maps information as of 1995. It is described...

  12. Isolation and application of Gordonia sp. JC11 for removal of boat lubricants.

    Science.gov (United States)

    Chanthamalee, Jirapat; Luepromchai, Ekawan

    2012-01-01

    Boat lubricants are continuously released into the marine environment and thereby cause chronic oil pollution. This study aims to isolate lubricant-degrading microorganisms from Thai coastal areas as well as to apply a selected strain for removal of boat lubricants. Ten microorganisms in the genera of Gordonia, Microbacterium, Acinetobacter, Pseudomonas, Brucella, Enterococcus and Candida were initially isolated by crude oil enrichment culture techniques. The lubricant-removal activity of these isolates was investigated with mineral-based lubricants that had been manufactured for the 4-stroke diesel engines of fishing boats. Gordonia sp. JC11, the most effective strain was able to degrade 25-55% of 1,000 mg L(-1) total hydrocarbons in six tested lubricants, while only 0-15% of the lubricants was abiotically removed. The bacterium had many characteristics that promoted lubricant degradation such as hydrocarbon utilization ability, emulsification activity and cell surface hydrophobicity. For bioaugmentation treatment of lubricant contaminated seawater, the inoculum of Gordonia sp. JC11 was prepared by immobilizing the bacterium on polyurethane foam (PUF). PUF-immobilized Gordonia sp. JC11 was able to remove 42-56% of 100-1,000 mg L(-1) waste lubricant No. 2 within 5 days. This lubricant removal efficiency was higher than those of free cells and PUF without bacterial cells. The bioaugmentation treatment significantly increased the number of lubricant-degrading microorganisms in the fishery port seawater microcosm and resulted in rapid removal of waste lubricant No. 2.

  13. The Analysis of Motion Dynamics and Resistance of the Multipurpose Boat Operating in Shallow Water

    Directory of Open Access Journals (Sweden)

    Jan Kulczyk

    2014-09-01

    Full Text Available Polish market of small boats has been developed very dynamically in recent years. Market competition forces the shipyards to build new more efficient hull forms and to cut the cost of production as well. This is why modern computer simulation programs are used more often by naval architects. Another trend is to design more universal ships that may be used by larger number of diversified customers. This paper presents project proposal of multipurpose boat hull form. The boat was design to fulfil the requirements imposed by public services like water police, fire brigades, and border guards. It is supposed to be operated on unexplored floodplains and other type shallow waters. The analysis of boat’s motion was based on computer simulations. The resistance curve was evaluated with two methods: comparison study of model test results of similar ships and CFD methods. The results obtained from Ansys Fluent and FINE/Marine systems were compared in this paper. It was shown that taking into consideration dynamic trim and sinkage has a significant impact on free surface capture and resistance values.

  14. Geopolymer Mortar with Fly Ash

    Directory of Open Access Journals (Sweden)

    Saloma

    2016-01-01

    Full Text Available The cement industry accounts for about 7% of all CO2 emissions caused by humans. Therefore, it is necessary to find another material in order to support sustainable material. An alternative way is replacing cement material with alternative material as fly ash. Fly ash as binder need to be added alkaline activator in the form of sodium silicate (Na2SiO3 or potassium silicate (K2SiO3 and sodium hydroxide (NaOH or potassium hydroxide (KOH. The purpose of this research is to analyze the effect of activator liquid concentration on geopolymer mortar properties and to know the value of compressive strength. Molarity variation of NaOH are 8, 12, 14, and 16 M with ratio of Na2SiO3/NaOH = 1.0. Ratio of sand/fly ash = 2.75 and ratio of activator/fly ash = 0.8. The cube-shaped specimen 50 × 50 × 50 mm is cured by steam curing with a temperature of 60°C for 48 hours. The experimental result of fresh mortar reported that the molarity of NaOH affect the slump flow and setting time, higher of NaOH produces the smaller value of slump and the faster time of setting. The experimental of density results reported that the increase of specific gravity when the molarity of NaOH increased. The experimental results of the compressive strength are showed that the maximum compressive strength of geopolymer mortar 14 M is 10.06 MPa and the lowest compressive strength produced by geopolymer mortar 8 M is 3.95 MPa. Testing the compressive strength of geopolymer mortar 16 M produces compressive strength lower than 14 M geopolymer mortar is 9.16 MPa.

  15. "Fly me to the moon"

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ China's first lunar probe Chang'e-I, named after a mythical Chinese goddess who, according to legend, made her home on the moon, blasted off on 24 October from the Xichang Satellite Launch Center in the southwestern province of Sichuan. In addition to making the dream cherished by Chinese people to fly to the moon come true, it is the first step into China's ambitious threestage moon mission, marking a new milestone in the country's space exploration history.

  16. Notes on flying and dying.

    Science.gov (United States)

    Meyer, B C

    1983-07-01

    Focused on selected details in the lives and creative works of Samuel Johnson, Edgar Allan Poe, and Houdini, this paper explores a seeming antinomy between claustrophobic annihilation and aviation. At first glance the latter appears as an antidote to the threat of entrapment and death. On a deeper level the distinction fades as the impression arises that in the examples cited, flying may represent an unconscious expression of a wish for death and ultimate reunion.

  17. Identifying glass compositions in fly ash

    Directory of Open Access Journals (Sweden)

    Katherine eAughenbaugh

    2016-01-01

    Full Text Available In this study, four Class F fly ashes were studied with a scanning electron microscope; the glassy phases were identified and their compositions quantified using point compositional analysis with k-means clustering and multispectral image analysis. The results showed that while the bulk oxide contents of the fly ashes were different, the four fly ashes had somewhat similar glassy phase compositions. Aluminosilicate glasses (AS, calcium aluminosilicate glasses (CAS, a mixed glass, and, in one case, a high iron glass were identified in the fly ashes. Quartz and iron crystalline phases were identified in each fly ash as well. The compositions of the three main glasses identified, AS, CAS, and mixed glass, were relatively similar in each ash. The amounts of each glass were varied by fly ash, with the highest calcium fly ash containing the most of calcium-containing glass. Some of the glasses were identified as intermixed in individual particles, particularly the calcium-containing glasses. Finally, the smallest particles in the fly ashes, with the most surface area available to react in alkaline solution, such as when mixed with portland cement or in alkali-activated fly ash, were not different in composition than the large particles, with each of the glasses represented. The method used in the study may be applied to a fly ash of interest for use as a cementing material in order to understand its potential for reactivity.

  18. Emissions in the exhaust of fishing boats after adding viscous agents into fuel oils.

    Science.gov (United States)

    Hsieh, Lien-Te; Shih, Shun-I; Lin, Sheng-Lun; Yang, Tsun-Lirng; Wu, Tser-Son; Hung, Chung-Hsien

    2009-12-20

    In order to avoid the illegal use of fishing boat fuel A (FBFA) by traveling diesel vehicles (TDVs) in Taiwan, alternatives that are easily distinguished from premium diesel fuel (PDF) were prepared to evaluate their suitability. Two new ingredients, pyrolysis fuel oil (PFO) and residue of desulfurization unit (RDS), were added into FBFA and formed PFO0.5 and RDS0.5, respectively. Along with FBFA, these three fuels were analyzed for their chemical and physical properties. Furthermore, they were used by three fishing boats with different sizes, output powers, and weights. The engine performances and pollutant emissions were examined and monitored. Experimental results show that there are significant differences in appearance between PDF and the two new blended fuels (PFO0.5 and RDS0.5), and thus misuse or illegal use of FBFA could be substantially reduced. The fuel consumption, which is negatively related to the heating value of fuels, is in order of FBFAfishing boats, using RDS0.5 resulted in a decrease in CO and NO(x) emissions, while the PM emission factors (g bhp(-1) h(-1) and g L(-1)-fuel) were reduced by approximately 36% and 33%, respectively. Owing to the higher total aromatic content in PFO0.5 and RDS0.5, total-PAH concentrations in the exhausts from the three fishing boats using PFO0.5 and RDS0.5 were slightly (1.2 and 1.1 times, respectively) higher than for those using FBFA. Nevertheless, the estimated total BaP(eq) from the three fishing boats using RDS0.5 was 27.5, 19.5, and 8.25% lower than those using FBFA. With using PFO0.5, they were totally different, at 23.5, 2.79, and 2.58% higher. With regard to looking different to PDF, RDS0.5 is superior to PFO0.5, and is thus recommended as a better alternative to FBFA, particularly because it can help lower more emissions of CO, NO(x), PM and BaP(eq).

  19. Ultrasonic vocalizations emitted by flying squirrels.

    Directory of Open Access Journals (Sweden)

    Meghan N Murrant

    Full Text Available Anecdotal reports of ultrasound use by flying squirrels have existed for decades, yet there has been little detailed analysis of their vocalizations. Here we demonstrate that two species of flying squirrel emit ultrasonic vocalizations. We recorded vocalizations from northern (Glaucomys sabrinus and southern (G. volans flying squirrels calling in both the laboratory and at a field site in central Ontario, Canada. We demonstrate that flying squirrels produce ultrasonic emissions through recorded bursts of broadband noise and time-frequency structured frequency modulated (FM vocalizations, some of which were purely ultrasonic. Squirrels emitted three types of ultrasonic calls in laboratory recordings and one type in the field. The variety of signals that were recorded suggest that flying squirrels may use ultrasonic vocalizations to transfer information. Thus, vocalizations may be an important, although still poorly understood, aspect of flying squirrel social biology.

  20. Possibilities of utilizing power plant fly ashes

    Directory of Open Access Journals (Sweden)

    Mezencevová Andrea

    2003-09-01

    Full Text Available The burning of fossil fuels in industrial power stations plays a significant role in the production of thermal and electrical energy. Modern thermal power plants are producing large amounts of solid waste, mainly fly ashes. The disposal of power plant waste is a large environmental problem at the present time. In this paper, possibilities of utilization of power plant fly ashes in industry, especially in civil engineering, are presented. The fly ash is a heterogeneous material with various physical, chemical and mineralogical properties, depending on the mineralogical composition of burned coal and on the used combustion technology. The utilization of fly ashes is determined of their properties. The fineness, specific surface area, particle shape, density, hardness, freeze-thaw resistance, etc. are decisive. The building trade is a branch of industry, which employs fly ash in large quantities for several decades.The best utilization of fluid fly ashes is mainly in the production of cement and concrete, due to the excellent pozzolanic and cementitious properties of this waste. In the concrete processing, the fly ash is utilized as a replacement of the fine aggregate (fine filler or a partial replacement for cement (active admixture. In addition to economic and ecological benefits, the use of fly ash in concrete improves its workability and durability, increases compressive and flexural strength, reduces segregation, bleeding, shrinkage, heat evolution and permeability and enhances sulfate resistance of concrete.The aim of current research is to search for new technologies for the fly ash utilization. The very interesting are biotechnological methods to recovery useful components of fly ashes and unconventional methods of modification of fly ash properties such as hydrothermal zeolitization and mechanochemical modification of its properties. Mechanochemistry deals with physico - chemical transformations and chemical reactions of solids induced by

  1. Transnational Relations Between The BBC And The WDR (1960-1969: The Central Roles Of Hugh Greene And Klaus Von Bismarck

    Directory of Open Access Journals (Sweden)

    Christian Potschka

    2012-11-01

    Full Text Available This paper addresses the relationship between the BBC Director-General Hugh Carleton Greene and the director of the West German Broadcasting Corporation (WDR Klaus von Bismarck between 1960 and 1969. The thrust of the article is to point out the great potential of evaluating interpersonal relationships and their contribution to European perspectives on television history. The research is situated within transnational television historiography and it argues that the relationship between the two key personalities is manifested in multiple interdependencies, exchanges, visits and correspondences that exemplify the long-term British impact on the German broadcasting system as well as the bilateral cordial relations between the BBC and the WDR.

  2. Mechanical properties and fabrication of small boat using woven glass/sugar palm fibres reinforced unsaturated polyester hybrid composite

    Science.gov (United States)

    Misri, S.; Leman, Z.; Sapuan, S. M.; Ishak, M. R.

    2010-05-01

    In recent years, sugar palm fibre has been found to have great potential to be used as fibre reinforcement in polymer matrix composites. This research investigates the mechanical properties of woven glass/sugar palm fibres reinforced unsaturated polyester hybrid composite. The composite specimens made of different layer of fibres such as strand mat, natural and hand woven of sugar palm fibres. The composites were fabricated using a compression moulding technique. The tensile and impact test was carried out in accordance to ASTM 5083 and ASTM D256 standard. The fibre glass boat is a familiar material used in boat industry. A lot of research on fabrication process such as lay-up, vacuum infusion mould and resin transfer mould has been conducted. Hybrid material of sugar palm fibre and fibre glass was used in fabricating the boat. This research investigates the method selection for fabrication of small boat application of natural fibre composites. The composite specimens made of different layer of fibres; woven glass fibre, strand mat, natural and hand woven of woven sugar palm fibres were prepared. The small boat were fabricated using a compression moulding and lay up technique. The results of the experiment showed that the tensile strength, tensile modulus, elongation at break value and impact strength were higher than the natural woven sugar palm fibre. The best method for fabricating the small boat was compression moulding technique. As a general conclusion, the usage of glass fibre had improved the tensile properties sugar palm fibre composites and compression moulding technique is suitable to be used in making a small boat application of natural fibre composites.

  3. A binational, supply-side evaluation for managing water quality and invasive fouling species on California's coastal boats.

    Science.gov (United States)

    Johnson, Leigh T; Fernandez, Linda M

    2011-12-01

    Integrated solutions are needed for sustainable management of risks posed by recreational boats to coastal water quality and ecosystems. Fouling organisms roughen vessel hull surfaces, creating friction that slows sailboats and increases fuel consumption by powerboats. Hull fouling control strategies for recreational boats that are stored in the water may include antifouling hull paints, newer alternative hull coatings, periodic in-water hull cleaning, and excluding propagules by surrounding the boat with a slip liner or raising it above water on a lift. Copper discharged to harbor waters from antifouling paints via passive leaching and in-water hull cleaning may elevate dissolved copper levels above government standards. Invasive species carried among boat-hull fouling organisms may be introduced as boats move among coastal areas. Some of these species tolerate copper in antifouling paints and copper-polluted harbor waters. Policy development must consider supply-side capacity, as well as economic and environmental sustainability, in managing these issues. This paper presents a supply-side evaluation useful in developing policies to co-manage water quality and invasive species risks for recreational boats navigating along the coasts of California, the Baja California peninsula and California's Sacramento-San Joaquin Delta. Supply-side perspectives on services, materials, costs, and boat owner behaviors, such as residence and travel patterns, awareness of hull-coating choices and selection of hull coatings, are determined. Analyses include evaluation of risks, risk management capacity and costs, and role of education in risk management. The issues raised are broadly applicable, as they are appearing on research and policy agendas in diverse coastal areas. Copyright © 2011 Elsevier Ltd. All rights reserved.

  4. Revised irradiation doses to control melon fly, Mediterranean fruit fly, and oriental fruit fly (Diptera: Tephritidae) and a generic dose for tephritid fruit flies.

    Science.gov (United States)

    Follett, Peter A; Armstrong, John W

    2004-08-01

    Currently approved irradiation quarantine treatment doses for Bactrocera cucurbitae (Coquillet), melon fly; Ceratitis capitata (Wiedemann), Mediterranean fruit fly; and Bactrocera dorsalis (Hendel), oriental fruit fly, infesting fruits and vegetables for export from Hawaii to the continental United States are 210, 225, and 250 Gy, respectively. Irradiation studies were initiated to determine whether these doses could be reduced to lower treatment costs, minimize any adverse effects on quality, and support a proposed generic irradiation dose of 150 Gy for fruit flies. Dose-response tests were conducted with late third instars of wild and laboratory strains of the three fruit fly species, both in diet and in fruit. After x-ray irradiation treatment, data were taken on adult emergence, and adult female fecundity and fertility. Melon fly was the most tolerant of the three species to irradiation, and oriental fruit fly was more tolerant than Mediterranean fruit fly. Laboratory and wild strains of each species were equally tolerant of irradiation, and larvae were more tolerant when irradiated in fruit compared with artificial diet. An irradiation dose of 150 Gy applied to 93,666 melon fly late third instars in papayas resulted in no survival to the adult stage, indicating that this dose is sufficient to provide quarantine security. Irradiation doses of 100 and 125 Gy applied to 31,920 Mediterranean fruit fly and 55,743 oriental fruit fly late third instars, respectively, also resulted in no survival to the adult stage. Results support a proposed generic irradiation quarantine treatment dose of 150 Gy for all tephritid fruit flies.

  5. Flying qualities criteria and flight control design

    Science.gov (United States)

    Berry, D. T.

    1981-01-01

    Despite the application of sophisticated design methodology, newly introduced aircraft continue to suffer from basic flying qualities deficiencies. Two recent meetings, the DOD/NASA Workshop on Highly Augmented Aircraft Criteria and the NASA Dryden Flight Research Center/Air Force Flight Test Center/AIAA Pilot Induced Oscillation Workshop, addressed this problem. An overview of these meetings is provided from the point of view of the relationship between flying qualities criteria and flight control system design. Among the items discussed are flying qualities criteria development, the role of simulation, and communication between flying qualities specialists and control system designers.

  6. Use Of Fly Iarvae In Space Agriculture

    Science.gov (United States)

    Katayama, Naomi; Mitsuhashi, Jun; Hachiya, Natumi; Miyashita, Sachiko; Hotta, Atuko

    The concept of space agriculture is full use of biological and ecological components ot drive materials recycle loop. In an ecological system, producers, consumers and decomposers are its member. At limited resources acailable for space agriculture, full use of members' function is required to avoid food shortage and catastrophe.Fly is categrized to a decomposer at its eating excreta and rotten materials. However, is it could be edible, certainly it is eaten in several food culture of the world, it functions as a converter of inedible biomass ot edible substance. This conversion enhances the efficiency of usage of resource that will be attributed to space agriculture. In this context, we examine the value of melon fly, Dacus cucurbitae, as a candidate fly species ofr human food. Nutrients in 100g of melon fly larvae were protein 12g, lipid 4.6g Fe 4.74mg, Ca 275mg, Zn 6.37mg, Mn 4.00mg. Amino acids compositon in 100g of larvae was glutamic acid 1.43g and aspartic acid 1.12g. Because of high contents of these amino acids taste of fly larva might be good. Life time of adult melon fly is one to two month, and lays more than 1,000 eggs in total during the life. Larvae hatch after one to two days, and metamorphose after 8 to 15 days to pupae. Srxual maturity is reached after 22 days the earliest from it egg. Sixteen generations could be succeeded in a year for melon fly at maximum. The rate of proliferation of fly is quite high compared to silkworm that can have 8.7 generations per year. The wide food habit of fly, compared to mulberry leaf for silkworm, is another advantage to choose fly for entomophage. Rearing technology of melon fly is well established, since large scaled production of sterile male fly has been conducted in order ot exterminate melon fly in the field. Feeding substance for melon fly larvae in production line is a mixture of wheat, bran, raw sugar, olara, beer yeast, tissue paper, and additive chemicals. A 1 kg of feed substance can be converted to

  7. What the fly's nose tells the fly's brain.

    Science.gov (United States)

    Stevens, Charles F

    2015-07-28

    The fly olfactory system has a three-layer architecture: The fly's olfactory receptor neurons send odor information to the first layer (the encoder) where this information is formatted as combinatorial odor code, one which is maximally informative, with the most informative neurons firing fastest. This first layer then sends the encoded odor information to the second layer (decoder), which consists of about 2,000 neurons that receive the odor information and "break" the code. For each odor, the amplitude of the synaptic odor input to the 2,000 second-layer neurons is approximately normally distributed across the population, which means that only a very small fraction of neurons receive a large input. Each odor, however, activates its own population of large-input neurons and so a small subset of the 2,000 neurons serves as a unique tag for the odor. Strong inhibition prevents most of the second-stage neurons from firing spikes, and therefore spikes from only the small population of large-input neurons is relayed to the third stage. This selected population provides the third stage (the user) with an odor label that can be used to direct behavior based on what odor is present.

  8. Characteristics of spanish fly ashes

    Directory of Open Access Journals (Sweden)

    de Luxán, M. P.

    1988-03-01

    Full Text Available The purpose of this study is the characterization of fly ashes produced by Spanish thermoelectric power plants, according to sampling taken in 1981 and 1982. The study takes in the following characteristics: physical characteristics (size distribution of particles, ...; chemical ones (chemical analysis...; and mineralogical ones (application of instrumental techniques of X-ray diffraction and infrared absorption spectroscopy. From a general point of view, it can be said that the samples of Spanish fly ashes are similar to those produced in other countries. The results obtained are a contribution to the knowledge of Spanish fly ashes and form part of the antecedents of investigations carried out in subsequent years.

    Este trabajo tiene por objeto la caracterización de las cenizas volantes producidas en las Centrales Termoeléctricas españolas, según un muestreo realizado entre 1981 y 1982. El estudio comprende las siguientes características: físicas (distribución del tamaño de partículas,...; químicas (análisis químico, …; y mineralógicas (aplicación de las técnicas instrumentales de difracción de rayos X y espectroscopía de absorción infrarroja. Desde un punto de vista general, se puede afirmar que las muestras de ceniza volante estudiadas son semejantes a las producidas en otros países. Los resultados obtenidos son una aportación al conocimiento de las cenizas volantes españolas y forman parte de los antecedentes de las investigaciones llevadas a cabo en años posteriores.

  9. Hughes Associates Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Olson, Brad [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2013-05-22

    This report focuses on the more limiting gasket material (neoprene and viton). The use of polymer based gasketing material has led the DOE to question whether the ducts will be able to maintain structural integrity during a fire.

  10. Susceptibility of low-chill blueberry cultivars to oriental fruit fly, mediterranean fruit fly, and melon fly (Diptera: Tephritidae)

    Science.gov (United States)

    Forced infestation studies were conducted to determine if fruits of southern highbush blueberries (Vaccinium corymbosum L. hybrids) are hosts for three invasive tephritid fruit flies. Fruits of 17 blueberry cultivars were exposed to gravid female flies of Bactrocera dorsalis (Hendel) (oriental frui...

  11. Commuter exposure to black carbon, carbon monoxide, and noise in the mass transport khlong boats of Bangkok, Thailand

    Science.gov (United States)

    Ziegler, A. D.; Velasco, E.; Ho, K. J.

    2013-12-01

    Khlong (canal) boats are a unique mass transport alternative in the congested city of Bangkok. Canals and rivers provide exclusive transit-ways for reducing the commuting time of thousands of city residents daily. However, as a consequence of the service characteristics and boats design and state of repair, they can represent a potential public health risk and an important source of black carbon and greenhouse gases. This work quantifies commuter exposure to black carbon, CO and noise when waiting for and travelling in these diesel fueled boats. Exposure to toxic pollutants and acute noise is similar or worse than for other transportation modes. Mean black carbon concentrations observed at one busy pier and along the main canal were much higher than ambient concentrations at sites impacted by vehicular traffic. Concentrations of CO were similar to those reported for roadside areas of Bangkok. The equivalent continuous sound levels registered at the landing pier were similar to those reported for roadsides, but values recorded inside the boats were significantly higher. We believe that the boat service is a viable alternative mode of mass transport, but public safety could be improved to provide a high quality service, comparable to modern rail systems or emerging bus rapid transit systems. These investments would also contribute to reduce the emission of black carbon and other greenhouse and toxic pollutants.

  12. Modeling the Impacts of Cetacean-Focused Tourism in Taiwan: Observations from Cetacean Watching Boats: 2002-2005

    Science.gov (United States)

    Tseng, Yung-Ping; Huang, Yu-Chin; Kyle, Gerard T.; Yang, Ming-Ching

    2011-01-01

    Cetacean-focused tourism in Taiwan has grown rapidly since 1997. This development, measured in terms of both number of tour boats and visitors, has resulted in many resource management challenges stemming from the absence of regulation and scientific data. To fill this void in empirical evidence, we used 464 sighting records from 2002 to 2005 to model the impact of cetacean-focused tourism. Cox proportional hazard analysis indicated cetacean avoidance responses to cetacean watching boats were strongly associated with pod size, mother-calf pairs, and cetacean-vessel distances. Mother-calf pairs abandoned their avoidance tactic by 55% compared to noncalf groups when tour boats approached. Second, the hazard ratio of abundance was 0.996, suggesting that the odds of encountering avoidance responses by the cetaceans decreased by 42% for every 100-member increase in the cetacean pod size. Last, distances maintained by boats from the cetaceans was positively related to avoidance responses (i.e., less avoidance behavior with closer interaction). Based on our findings, we have the following recommendations: (a) limit vessels from approaching mothers with calves, (b) limit vessels from approaching small groups of cetaceans, (c) reduced avoidance behavior to boat traffic may be a red flag for potential long-term disturbance, and (d) apply the "precautionary principle" based on the best scientific information available in cetacean-based tourism in Taiwan. These recommendations will help contribute to the sustainable development of cetacean-focused tourism in Taiwan.

  13. Quantification of Boat Visitation Rates at Artificial and Natural Reefs in the Eastern Gulf of Mexico Using Acoustic Recorders.

    Science.gov (United States)

    Simard, Peter; Wall, Kara R; Mann, David A; Wall, Carrie C; Stallings, Christopher D

    2016-01-01

    Artificial reefs are commonly used as a management tool, in part to provide ecosystem services, including opportunities for recreational fishing and diving. Quantifying the use of artificial reefs by recreational boaters is essential for determining their value as ecosystem services. In this study, four artificial-natural reef pairs in the eastern Gulf of Mexico (off western Florida) were investigated for boat visitation rates using autonomous acoustic recorders. Digital SpectroGram (DSG) recorders were used to collect sound files from April 2013 to March 2015. An automatic detection algorithm was used to identify boat noise in individual files using the harmonic peaks generated by boat engines, and by comparing the sound amplitude of each file with surrounding files. In all four pairs, visitation rates were significantly higher at the artificial reef than the natural reef. This increase in boat visitation was likely due to actual or perceived increased quality of fishing and diving at the artificial reefs, or to lack of knowledge of the presence or locations of the natural reefs. Inshore reefs (25 m depth). This study appears to be the first to use acoustic data to measure participant use of boating destinations, and highlights the utility of acoustic monitoring for the valuation of this important ecosystem service provided by artificial reefs.

  14. Quantification of Boat Visitation Rates at Artificial and Natural Reefs in the Eastern Gulf of Mexico Using Acoustic Recorders

    Science.gov (United States)

    Simard, Peter; Wall, Kara R.; Mann, David A.; Wall, Carrie C.; Stallings, Christopher D.

    2016-01-01

    Artificial reefs are commonly used as a management tool, in part to provide ecosystem services, including opportunities for recreational fishing and diving. Quantifying the use of artificial reefs by recreational boaters is essential for determining their value as ecosystem services. In this study, four artificial–natural reef pairs in the eastern Gulf of Mexico (off western Florida) were investigated for boat visitation rates using autonomous acoustic recorders. Digital SpectroGram (DSG) recorders were used to collect sound files from April 2013 to March 2015. An automatic detection algorithm was used to identify boat noise in individual files using the harmonic peaks generated by boat engines, and by comparing the sound amplitude of each file with surrounding files. In all four pairs, visitation rates were significantly higher at the artificial reef than the natural reef. This increase in boat visitation was likely due to actual or perceived increased quality of fishing and diving at the artificial reefs, or to lack of knowledge of the presence or locations of the natural reefs. Inshore reefs (25 m depth). This study appears to be the first to use acoustic data to measure participant use of boating destinations, and highlights the utility of acoustic monitoring for the valuation of this important ecosystem service provided by artificial reefs. PMID:27500533

  15. Modeling the impacts of cetacean-focused tourism in Taiwan: observations from cetacean watching boats: 2002-2005.

    Science.gov (United States)

    Tseng, Yung-Ping; Huang, Yu-Chin; Kyle, Gerard T; Yang, Ming-Ching

    2011-01-01

    Cetacean-focused tourism in Taiwan has grown rapidly since 1997. This development, measured in terms of both number of tour boats and visitors, has resulted in many resource management challenges stemming from the absence of regulation and scientific data. To fill this void in empirical evidence, we used 464 sighting records from 2002 to 2005 to model the impact of cetacean-focused tourism. Cox proportional hazard analysis indicated cetacean avoidance responses to cetacean watching boats were strongly associated with pod size, mother-calf pairs, and cetacean-vessel distances. Mother-calf pairs abandoned their avoidance tactic by 55% compared to noncalf groups when tour boats approached. Second, the hazard ratio of abundance was 0.996, suggesting that the odds of encountering avoidance responses by the cetaceans decreased by 42% for every 100-member increase in the cetacean pod size. Last, distances maintained by boats from the cetaceans was positively related to avoidance responses (i.e., less avoidance behavior with closer interaction). Based on our findings, we have the following recommendations: (a) limit vessels from approaching mothers with calves, (b) limit vessels from approaching small groups of cetaceans, (c) reduced avoidance behavior to boat traffic may be a red flag for potential long-term disturbance, and (d) apply the "precautionary principle" based on the best scientific information available in cetacean-based tourism in Taiwan. These recommendations will help contribute to the sustainable development of cetacean-focused tourism in Taiwan.

  16. Total tin and organotin speciation in historic layers of antifouling paint on leisure boat hulls.

    Science.gov (United States)

    Lagerström, Maria; Strand, Jakob; Eklund, Britta; Ytreberg, Erik

    2017-01-01

    Despite their ban on small vessels in 1989 in the EU, organotin compounds (OTCs) are still being released into the environment due to their presence in historic paint layers on leisure boats. 23 paint samples scraped from recreational boats from three countries around the Baltic Sea were analyzed for total tin (Sn) and OTCs. Two antifouling paint products were also subjected to the same analyses. A new method for the detection of Sn in paint flake samples was developed and found to yield more accurate results compared to four different acid digestion methods. A new method was also developed for the extraction of OTCs from ground paint flakes. This endeavor revealed that existing methods for organotin analysis of sediment may not have full recoveries of OTCs if paint flakes are present in the sample. The hull paint samples had Sn concentrations ranging from 25 to 18,000 mg/kg paint and results showed that tributyltin (TBT) was detected in all samples with concentrations as high as 4.7 g (as Sn)/kg paint. TBT was however not always the major OTC. Triphenyltin (TPhT) was abundant in many samples, especially in those originating from Finland. Several other compounds such as monobutyltin (MBT), dibutyltin (DBT), tetrabutyltin (TeBT), monophenyltin (MPhT) and diphenyltin (DPhT) were also detected. These could be the result of degradation occurring on the hull or of impurities in the paint products as they were also identified in the two analyzed paint products. A linear correlation (r(2) = 0.934) was found between the total tin content and the sum of all detected OTCs. The detection of tin can therefore be used to indicate the presence of OTCs on leisure boats. Copyright © 2016 The Authors. Published by Elsevier Ltd.. All rights reserved.

  17. Weekday/weekend differences in gasoline related hydrocarbons at coastal PAMS sites due to recreational boating

    Science.gov (United States)

    Henry, Robert F.

    2013-08-01

    Analysis of PAMS (Photochemical Assessment Monitoring Stations) data at several coastal sites reveals large weekday/weekend differences in gasoline related hydrocarbons. Elevated concentrations of gasoline related constituents, including alkanes, alkenes, and aromatics, are observed on weekends at the PAMS monitors at Sherwood Island State Park in Westport, CT and at Newbury, MA. An analysis of the ratio of the concentrations of 2,3-dimethylbutane to 2,2-dimethylbutane indicates these compounds are freshly emitted, and an investigation in conjunction with wind data shows that the elevated concentrations are associated primarily with onshore winds. These elevated concentrations are most likely due to weekend recreational boating.

  18. Study Project Comprising Two Surveys on Behalf of the National Association of State Boating Law Administrators.

    Science.gov (United States)

    1975-06-01

    units been involved in a search for persons thought to be lost in the water? Boat Swimmer Hunter-Fisherman Aircraft Total 11 Would staff of your SAR...Governors Island. Our search plan coincides with standard procedures (i.e.) expanded search, etc. 5. Occurrences involving swimmers and surfers have...0 :D 4Jf 10 OU 4 PC to 41N~ 0~ 0 lue ~ --4 0 0 m4O0 ~ 4~ Z) ts Z 0 - - imt < U- 4 ") 4H 0 u0 u i 69 CD 00 o 0000 0 0 0 S0cJ N Oa O 0 %D %.0~o o..-r O

  19. Recreational Boat Safety Collision Research - Phase 2. Volume 2. Collision Accident Investigations - 1975

    Science.gov (United States)

    1976-07-01

    greater on every weekday except Wednesday than on Saturday or Sunday. Perhaps boaters are more careful on weekends when waterways are more crowded...that his boat was for rer, so more care could have been given to lookout for the water scooter. Use of alcohol bf no. 4 may have caused him not to...batterry and fuell tank al h if itulewae udrsa 90 DAY ~1 / 0% Mane plywood * Telescopc peddle 0 Self beling GENTLE AS A KITTEN , due to Hydro-Cycle’s unique

  20. Oxford and Cambridge Boat Race: Performance, Pacing and Tactics Between 1890 and 2014.

    Science.gov (United States)

    Edwards, Andrew M; Guy, Joshua H; Hettinga, Florentina J

    2016-10-01

    Currently no studies have examined the historical performances of Oxford and Cambridge Boat Race crews in the context of performance, pacing and tactics which is surprising as the event has routinely taken place annually for over 150 years on the same course. The purpose of this study was twofold, to firstly examine the historical development of performances and physical characteristics of crews over 124 years of the Oxford and Cambridge Boat Race between 1890 and 2014 and secondly to investigate the pacing and tactics employed by crews over that period. Linear regression modelling was applied to investigate the development of performance and body size for crews of eight male individuals over time from Boat Race archive data. Performance change over time was further assessed in 10-year clusters while four intra-race checkpoints were used to examine pacing and tactics. Significant correlations were observed between performance and time (1890-2014) for both Oxford (r = -0.67; p Cambridge (r = -0.64; p Cambridge (1168 ± 89.8 s) during 1890-2014. Crew performance times improved over time with significant gains from baseline achieved in the 1950s (Cambridge) and the 1960s (Oxford), which coincided with significant change in the physicality of the competing crews (p < 0.01). There was no tactical advantage from commencing on either the Surrey or Middlesex station beyond chance alone; however, all crews (n = 228) adopted a fast-start strategy, with 81 % of victories achieved by the crew leading the race at the first intra-race checkpoint (24 % of total distance). Crews leading the race at the final checkpoint (83 % of total distance; 1143 m) achieved victory on 94 % of occasions. Performances and physical characteristics of the crews have changed markedly since 1890, with faster heavier crews now common. Tactically, gaining the early lead position with a fast-start strategy seems particularly meaningful to success in the Boat Race throughout the years

  1. The Boat-coffins and Single-log Coffins in Shangye Street, Chengdu, Sichuan

    Institute of Scientific and Technical Information of China (English)

    蒋成; 颜劲松; 陈云洪; 刘雨茂; 王淑芳

    2003-01-01

    The boat-coffins and single-log coffins are located in No. 58, Shangye 商业 Street, within the first ring road of Chengdu 成都 downtown area. From July 2000 to the beginning of 2001 Chengdu Municipal Institute of Antiquity and Archaeology made an excavation of this site and determined it to be a massive tomb of the early Warring States period. It was selected as one of the top ten great archaeological discoveries in China in 2000 and declared by the State Council as a historical site of the fifth group under special protection within China in July 2001.

  2. Self hardening property of Botswana fly ash | Sahu | Botswana ...

    African Journals Online (AJOL)

    Self hardening property of Botswana fly ash. ... In the present investigation, an effort has been made to study the self hardening property of Botswana fly ash by ... This will encourage the use of fly ash economically as a construction material.

  3. A fly larva (Syrphidae: Ocyptamus that preys on adult flies

    Directory of Open Access Journals (Sweden)

    Onanchi Ureña

    2010-12-01

    Full Text Available Predatory syrphid larvae feed on relatively immobile prey, but here we report the first case (as far as we are aware of obligatory predation on very mobile prey. Larvae of an undescribed species of Ocyptamus (Diptera: Syrphidae were found in whitefly (Hemiptera: Aleyrodidae aggregations on the undersides of citrus leaves. However, instead of preying on the whitefly nymphs (as would be expected, the larvae preyed on adult flies (Diptera that were attracted to the honeydew. In the laboratory, larvae captured significantly more flies on whitefly infested leaves than on washed leaves, and generally abandoned leaves that lacked whiteflies. Most cases of successful prey capture involved flies that probed the anterior part of the larva’s body with its proboscis (as if it were honeydew. The syrphid larva lashed out at the fly and entangled it in sticky oral secretion. The prey did not recover when they were removed from the larva, suggesting that this new predatory species also employs venom to subdue its prey. Although the larvae consumed some honeydew, they were unable to complete their development on this diet. Two parasitoids were reared from Ocyptamus puparia, Proaspicera sp. (Hymenoptera: Figitidae and Paracarotomus sp. (Hymenoptera: Pteromalidae, both of which are endoparasitic koinobionts. Rev. Biol. Trop. 58 (4: 1157-1163. Epub 2010 December 01.Las larvas depredadoras de Syrphidae se alimentan de presas relativamente inmóviles, pero aquí reportamos el primer caso (hasta ahora conocido de la depredación obligatoria en presas muy móviles. Se encontraron las larvas de una especie no descrita de Ocyptamus (Diptera: Syrphidae juntas con ninfas de mosca blanca (Hemiptera: Aleyrodidae en el envés de las hojas de cítricos. Sin embargo, en vez de alimentarse de las ninfas de mosca blanca (como debería esperarse, las larvas se alimentaron de moscas adultas (Diptera que fueron atraídas a las excreciones azucaradas de la mosca blanca. En el

  4. Requirements for satisfactory flying qualities of airplanes

    Science.gov (United States)

    Gilruth, R R

    1943-01-01

    Report discusses the results of an analysis of available data to determine what measured characteristics are significant in defining satisfactory flying qualities, what characteristics are reasonable to require of an airplane, and what influence the various design features have on the observed flying qualities.

  5. MODAL CONTROL OF PILOTLESS FLYING MACHINE

    Directory of Open Access Journals (Sweden)

    V. A. Antanevich

    2010-01-01

    Full Text Available The paper considers a problem on synthesis of lateral movement control algorithms in a pilotless flying machine which is made on the basis of a modal control method providing a required root arrangement of a characteristic closed control system polynom. Results of the modeling at stabilization of a lateral pilotless flying machine co-ordinate are presented in the paper.

  6. Flying Probe Tester: Architecture, Principle and Implementation

    Institute of Scientific and Technical Information of China (English)

    Fu,Xu; Fang,Kangling; Chen,Guoqing

    2005-01-01

    This paper introduces the flying probe tester, which is a testing device for PCB. The architecture and principle of flying probe tester are firstly introduced. Then the implementation of hardware and software is illuminated briefly. Finally, the optimizing method for the probe's moving path is researched based on the traveling salesman problem.

  7. Low back pain and low level flying

    NARCIS (Netherlands)

    J.C.F.M. Aghina

    1989-01-01

    textabstractLow level flying is a very good tactical possibility to carry out a mission unseen by a hostile radarsystem. Nowadays, Western Europe in general and the Federal Republic of Germany in particular, decreased . the permissions to low level flying in assigned regions. That's why the

  8. Testing for Mutagens Using Fruit Flies.

    Science.gov (United States)

    Liebl, Eric C.

    1998-01-01

    Describes a laboratory employed in undergraduate teaching that uses fruit flies to test student-selected compounds for their ability to cause mutations. Requires no prior experience with fruit flies, incorporates a student design component, and employs both rigorous controls and statistical analyses. (DDR)

  9. Catch Composition of Tsetse Flies (Glossina: Glossinidae

    Directory of Open Access Journals (Sweden)

    K. E. Okoh

    2011-01-01

    Full Text Available Problem statement: A study to determine the composition of tsetse flies species was conducted between January and December, 2007 in Kamuku National Park, Nigeria, using Biconical and Nitse traps. Tsetse flies were trapped along gallery forest in five streams for two trapping days and were collected daily. Approach: All tsetse flies caught were identified to species level, sexed, separated into teneral and non-teneral, hunger staged and Mean Hunger Stage computed. Fly density were calculated, the age structure examined using wing fray techniques for males and ovarian technique for females; the reproductive status of female flies were assessed. Two species of tsetse flies (Glossina palpalis palpalis robineau-desvoidy and Glossina tachinoides Westwood were caught in total of five hundred and two (502 flies. Out of these, 309(61.6% Glossina tachinoides and 193(38.4% G. palpalis were caught. Male catches (309, 61.6% were significantly (P Results: The estimated mean age for males was 11 days and females were 8 days. The insemination rate of 93.8% generally was high, G. tachinoides recorded 95.5% more than G. palpalis of 91.6%. Whereas parity rate (25.8% was low; G. palpalis was 37.4% while G. tachinoides parity rate is 17.2%. Conclusion: The study shows that two species of tsetse flies abound in the park although at low densities their presence may bear semblance to Trypanosomiasis and its impact to ecotourism.

  10. Physicochemical characterization of Spanish fly ashes

    Energy Technology Data Exchange (ETDEWEB)

    Querol, X.; Umana, J.C.; Alastuey, A.; Bertrana, C.; Lopez-Soler, A.; Plana, F.

    1999-12-01

    This article summarizes the results obtained from the physical, chemical, and mineralogical characterization of 14 fly ash samples. Major features that influence the utilization of each fly ash for zeolite synthesis are evidenced, and several fly ash types were selected as potential high-quality starting material for zeolite synthesis and ceramic applications. The main parameters influencing this selection were relatively small grain size; high Al and Si contents; high glass content; low CaO, S, and Fe contents; and relatively low heavy metal concentration. The Compostilla and Cou He fly ashes have high potential applications because of the low content of major impurities (such as Ca, Fe, and S) and the low content of soluble hazardous elements. The Espiel, Escucha, Los Barrios, As Pontes, Soto de Ribera, Meirama, Narcea, and Teruel fly ashes have important application potential, but this potential is slightly limited by the intermediate content of nonreactive impurities, such as Fe and Ca. The La Robla fly ash is of moderate interest, since the relatively high Ca and Fe oxide contents may reduce its potential applications. Finally, the Puertollano fly ash also has limited application because of the very high concentration of some heavy metals such as As, Cd, Ge, Hg, Pb, and Zn. From a mineralogical point of view, the Compostilla, Espiel, and Soto de Ribera fly ashes show the highest aluminum-silicate glass content and, consequently, the highest industrial application potential.

  11. Physiochemical characterization of Spanish fly ashes

    Energy Technology Data Exchange (ETDEWEB)

    Querol, X.; Umana, J.C.; Alastuey, A.; Bertrana, C.; Lopez Soler, A.; Plana, F.

    1999-12-01

    This article summarizes the results obtained from the physical, chemical, and mineralogical characterization of 14 fly ash samples. Major features that influence the utilization of each fly ash for zeolite synthesis are evidenced, and several fly ash types were selected as potential high-quality starting material for zeolite synthesis and ceramic applications. The main parameters influencing this selection were relatively small grain size; high Al and Si contents; high glass content; low CaO, S, and Fe contents; and relatively low heavy metal concentration. The Compostilla and Dou He fly ashes have high potential applications because of the low content of major impurities (such as Ca, Fe, and S) and the low content of soluble hazardous elements. The Espiel, Escucha, Los Barrios, As Pontes, Soto de Ribera, Meirama, Narcea, and Teruel fly ashes have important application potential, but this potential is slightly limited by the intermediate content of nonreactive impurities, such as Fe and Ca. The La Robla fly ash is of moderate interest, since the relatively high Ca and Fe oxide contents may reduce its potential applications. Finally, the Puertollano fly ash also has limited application because of the very high concentration of some heavy metals such as As, Cd, Ge, Hg, Pb, and Zn. From a mineralogical point of view, the Compostilla, Espiel, and Soto de Ribera fly ashes show the highest aluminum-silicate glass content and, consequently, the highest industrial application potential. (author)

  12. Low back pain and low level flying

    NARCIS (Netherlands)

    J.C.F.M. Aghina

    1989-01-01

    textabstractLow level flying is a very good tactical possibility to carry out a mission unseen by a hostile radarsystem. Nowadays, Western Europe in general and the Federal Republic of Germany in particular, decreased . the permissions to low level flying in assigned regions. That's why the Royal Ne

  13. Construction procedures using self hardening fly ash

    Science.gov (United States)

    Thornton, S. I.; Parker, D. G.

    1980-07-01

    Fly ash produced in Arkansas from burning Wyoming low sulfur coal is self-hardening and can be effective as a soil stabilizing agent for clays and sands. The strength of soil-self hardening fly ash develops rapidly when compacted immediately after mixing. Seven day unconfined compressive strengths up to 1800 psi were obtained from 20% fly ash and 80% sand mixtures. A time delay between mixing the fly ash with the soil and compaction of the mixture reduced the strength. With two hours delay, over a third of the strength was lost and with four hours delay, the loss was over half. Gypsum and some commercial concrete retarders were effective in reducing the detrimental effect of delayed compaction. Adequate mixing of the soil and fly ash and rapid compaction of the mixtures were found to be important parameters in field construction of stabilized bases.

  14. Development of boats propelled by fuel cells; Developpement d'embarcations mues par piles a combustible

    Energy Technology Data Exchange (ETDEWEB)

    Affolter, J.F.; Mariotti, P. [Ecole d' Ingenieurs du Canton de Vaud, HES-SO, Yverdon les Bains (Switzerland)

    2000-07-01

    An important European demand for propulsion systems lead us to think that the number of electric ships is growing rapidly. A lot of lakes in Europe are not allowed to the thermal navigation. The aim is to offer a maximum of comfort, reliability, silence, lack of pollution and respect to environment. One of the answers to this expectation is the use of the electric propulsion and a generation of power with fuel cells. After having fabricated the 'Hydroxy100', a single-seater boat propelled by a 100 W fuel cell, and a two-seater boat designed for a 300 W fuel cell, a new plan for a six-seater pleasure boat is being studied. These pilot plans are carried out with the aim to favour the development of this technology. (O.M.)

  15. Modified technique of using conventional slider boat for liquid phase epitaxy of silicon for solar cell application

    Indian Academy of Sciences (India)

    D Majumdar; S Chatterjee; U Gangopadhyay; H Saha

    2003-10-01

    Epitaxial layers of silicon are grown on single crystal Si-substrate from a solution of silicon in indium using conventional graphite slider boat technique. The important problems of natural convection due to lower density of silicon compared to indium, poor wetting of substrate due to high angle of contact of indium solution on silicon substrate resulting in poor nucleation, melt removal from the growth substrate and saturation wafer associated with LPE in this technique are practically eliminated using sandwich method with simple modifications of the boat and the method of growth. Some experimental studies on the effect of different surface preparations of growth substrate are also reported. Growth results are shown and discussed. Further, improvization of slider boat to facilitate better study of growth parameters is suggested in the line of modification already carried out.

  16. Internal conflicts of Emily Dickinson-A study of the images of boat and sea in Dickinson’s poems

    Institute of Scientific and Technical Information of China (English)

    WAN Hai-yan

    2014-01-01

    The peculiar images, the boat and the sea, often recur in the poems of Emily Dickinson, the great American poet, which well reflect her internal conflicts, the conflicts between being an autonomous woman and being a passionate yet submissive wom-an. In her poems, the sea is a symbol of the male-dominated society or an individual man. While the little boat is the epitome of Dickinson:sometimes it wants to be strong-willed and clear of its destination, sometimes it just wants to moor in the sea and en-joy the calmness. The paper tends to reveal the psychological struggle of Emily Dickinson and show the whole image of her as an individual through the analysis of the images of boat and sea in Dickinson’s poems.

  17. Influence of boat noises on escape behaviour of white-spotted eagle ray Aetobatus ocellatus at Moorea Island (French Polynesia).

    Science.gov (United States)

    Berthe, Cecile; Lecchini, David

    2016-02-01

    The present study tested different sounds that could disturb eagle rays (Aetobatus ocellatus) during their foraging activities at Moorea, French Polynesia. Results showed that artificial white sound and single-frequency tones (40 Hz, 600 Hz or 1 kHz) did not have an effect on rays (at least 90% of rays continued to forage over sand), while playbacks of boat motor sound significantly disturbed rays during foraging activity (60% exhibited an escape behaviour). Overall, our study highlighted the negative effect of boat noises on the foraging activity of eagle rays. These noises produced by boat traffic could, however, have some positive effects for marine aquaculture if they could be used as a deterrent to repel the eagle rays, main predators of the pearl oysters.

  18. TrackFly: virtual reality for a behavioral system analysis in free-flying fruit flies.

    Science.gov (United States)

    Fry, Steven N; Rohrseitz, Nicola; Straw, Andrew D; Dickinson, Michael H

    2008-06-15

    Modern neuroscience and the interest in biomimetic control design demand increasingly sophisticated experimental techniques that can be applied in freely moving animals under realistic behavioral conditions. To explore sensorimotor flight control mechanisms in free-flying fruit flies (Drosophila melanogaster), we equipped a wind tunnel with a Virtual Reality (VR) display system based on standard digital hardware and a 3D path tracking system. We demonstrate the experimental power of this approach by example of a 'one-parameter open loop' testing paradigm. It provided (1) a straightforward measure of transient responses in presence of open loop visual stimulation; (2) high data throughput and standardized measurement conditions from process automation; and (3) simplified data analysis due to well-defined testing conditions. Being based on standard hardware and software techniques, our methods provide an affordable, easy to replicate and general solution for a broad range of behavioral applications in freely moving animals. Particular relevance for advanced behavioral research tools originates from the need to perform detailed behavioral analyses in genetically modified organisms and animal models for disease research.

  19. Predicting fruit fly's sensing rate with insect flight simulations

    National Research Council Canada - National Science Library

    Song Chang; Z. Jane Wang

    2014-01-01

    .... Interpreting our findings together with experimental results on fruit flies' reaction time and sensory motor reflexes, we conjecture that fruit flies sense their kinematic states every wing beat...

  20. Biomass fly ash in concrete: SEM, EDX and ESEM analysis

    Energy Technology Data Exchange (ETDEWEB)

    Shuangzhen Wang; Larry Baxter; Fernando Fonseca [Brigham Young University, Provo, UT (USA). Department of Chemical Engineering

    2008-03-15

    This document summarizes microscopy study of concrete prepared from cement and fly ash (25% fly ash and 75% cement by weight), which covers coal fly ash and biomass fly ash. All the fly ash concrete has the statistical equal strength from one day to one year after mix. Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) and environmental scanning electron microscopy (ESEM) analysis show that both coal and biomass fly ash particles undergo significant changes of morphology and chemical compositions in concrete due to pozzolanic reaction, although biomass fly ash differs substantially from coal fly ash in its fuel resources. 8 refs., 17 figs., 1 tab.

  1. Electrodialytic removal of heavy metals from fly ashes

    DEFF Research Database (Denmark)

    Pedersen, Anne Juul

    2002-01-01

    The aim of the Ph.D. work was to develop the electrodialytic remediation method for removal of heavy metals from fly ashes. The work was focused on two types of fly ashes: fly ashes from wood combustion and fly ashes from municipal solid waste incineration.......The aim of the Ph.D. work was to develop the electrodialytic remediation method for removal of heavy metals from fly ashes. The work was focused on two types of fly ashes: fly ashes from wood combustion and fly ashes from municipal solid waste incineration....

  2. 经编无缝船袜的开发%Development of Warp Knitted Seamless Boat Socks

    Institute of Scientific and Technical Information of China (English)

    姚馨馨; 丛洪莲

    2015-01-01

    经编无缝船袜是由双针床拉舍尔经编机生产的一次成型织物。船袜又称“隐形袜”,鞋子可将袜面部分罩住。经编无缝船袜款式多样,花型丰富,且无缝合,吸湿排汗,穿着十分舒适。本课题介绍了船袜的生产设备、多款经编无缝船袜的不同特点,选用花型时的注意点以及船袜的功能性特点,如利用硅胶使得经编无缝船袜摒弃易滑脱的缺陷等。简单介绍船袜的开发过程。未来经编无缝船袜需要从新原料、新款式、新工艺等角度出发,获得更广阔的市场。%Warp knitted seamless boat socks were produced by a double bar raschel machine. It is called in-visible boat socks whose face can be covered by shoes. Warp knitted seamless boat socks have diverse styles and rich patterns, they are moisture absorbable, breathable and comfortable. Some main points of boat socks were in-troduced such as the production equipment, different characteristics with diverse styles, key points for selecting patterns and its functional features such as the use of silica gel which made the warp knitted seamless boat socks hard to slip. The development process of boat socks was briefly introduced. From the perspective of new materi-als, new style and new technology, the future of warp knitted seamless socks will have a broader market.

  3. Avrocar: a real flying saucer

    CERN Document Server

    Fedrigo, Desire Francine G; Gobato, Alekssander

    2015-01-01

    One of the most unusual military aircraft programs V / STOL was the Avro VZ-9 "Avrocar". Designed to be a real flying saucer, the Avrocar was one of the few V / STOL to be developed in complete secrecy. Despite significant changes in the design, during flight tests, the Avrocar was unable to achieve its objectives, and the program was eventually canceled after an expenditure of 10 million US dollars between 1954 and 1961. But the concept of a lift fan, driven by a turbojet engine is not dead, and lives today as a key component of Lockheed X-35 Joint Strike Fighter contender. Was held in a data research and information related to Avrocar project carried out during the Second World War, which was directly linked to advances in aircraft that were built after it, and correlate them with the turbo fan engines used today.

  4. Development and evaluation of a boat-mounted RFID antenna for monitoring freshwater mussels

    Science.gov (United States)

    Fischer, Jesse R.; Neebling, Travis E.; Quist, Michael C.

    2012-01-01

    Development of radio frequency identification (RFID) technology and passive integrated transponder (PIT) tags has substantially increased the ability of researchers and managers to monitor populations of aquatic organisms. However, use of transportable RFID antenna systems (i.e., backpack-mounted) is currently limited to wadeable aquatic environments (RFID antenna to detect individually PIT-tagged benthic aquatic organisms (mussels). We evaluated the effects of tag orientation on detection distances in water with a 32-mm half-duplex PIT tag. Detection distances up to 50 cm from the antenna coils were obtained, but detection distance was dependent on tag orientation. We also evaluated detection distance of PIT tags beneath the sediment to simulate detection of burrowing mussels with 23- and 32-mm tags. In sand substrate, the maximum detection distance varied from 3.5 cm and 4.5 cm (vertical tag orientation) to 24.7 cm and 39.4 cm (45° tag orientation) for the 23- and 32-mm PIT tags, respectively. Our results suggest a 1.4-m total detection width for tagged mussels on the substrate surface by the boat-mounted antenna system regardless of tag orientation. However, burrowed mussels may require multiple passes to increase detection that would be influenced by depth, tag orientation, and tag size. Construction of the boat-mounted antenna was relatively low in cost (<500 USD) and had several advantages (less labor and time intensive, increased safety) over traditional mussel sampling techniques (diving, snorkeling) in nonwadeable habitats.

  5. Hydrodynamics of a self-propelled camphor boat at the air-water interface

    Science.gov (United States)

    Akella, Sathish; Singh, Dhiraj; Singh, Ravi; Bandi, Mahesh

    2015-11-01

    A camphor tablet, when placed at the air-water interface undergoes sublimation and camphor vapour spreads radially outwards across the surface due to Marangoni forces. This steady camphor influx from tablet onto the air-water interface is balanced by the camphor outflux due to evaporation. When spontaneous fluctuations in evaporation break the axial symmetry of Marangoni force acting radially outwards, the camphor tablet is propelled like a boat along the water surface. We report experiments on the hydrodynamics of a self-propelled camphor boat at air-water interfaces. We observe three different modes of motion, namely continuous, harmonic and periodic, due to the volatile nature of camphor. We explain these modes in terms of ratio of two time-scales: the time-scale over which viscous forces are dominant over the Marangoni forces (τη) and the time-scale over which Marangoni forces are dominant over the viscous forces (τσ). The continuous, harmonic and periodic motions are observed when τη /τσ ~ 1 , τη /τσ >= 1 and τη /τσ >> 1 respectively. Experimentally, the ratio of the time scales is varied by changing the interfacial tension of the air-water interface using Sodium Dodecyl Sulfate. This work was supported by the Collective Interactions Unit, OIST Graduate University.

  6. Energetic analyses of chair and boat conformations of maleimide substituted cyclohexane derivatives.

    Science.gov (United States)

    Remmert, Sarah; Parish, Carol

    2009-04-30

    An analysis of the conformational preferences of two maleimide substituted cyclohexane derivatives proposed as scaffolds for HIV-1 fusion inhibitors is presented. Hybrid Low Mode-Monte Carlo (1:1) conformational searches using seven different force fields were performed in combination with the GBSA(water) solvent model. Low energy structures identified in this way were subjected to geometry optimization on the B3LYP/6-31G** surface. Solvent effects were included in the quantum calculation using the self-consistent reaction field model for water. Quantum results indicate that the 1,3,5-maleimide functionalized 1,3,5-methyl cyclohexane is more stable in the boat conformation, whereas 1,3,5-maleimide functionalized cyclohexane adopts the expected chair conformation with equatorial arms. None of the force fields studied was able to predict the unexpected preference for the boat conformation of 1,3,5-maleimide functionalized 1,3,5-methyl cyclohexane. Comparison of low energy and experimental structures was also performed.

  7. Dragon Boat training exerts a positive effect on myocardial function in breast cancer survivors.

    Science.gov (United States)

    Stefani, Laura; Galanti, Giorgio; Di Tante, Valentina; Klika, Riggs J; Maffulli, Nicola

    2015-07-01

    Dragon Boat training is often suggested to control upper limb edema in breast cancer (BC) survivors, but little information is available regarding the cardiac impact of such activity. The present study evaluates this aspect during a 4-year follow-up of BC survivors. From 2006 to 2010, 55 women diagnosed with BC in 2005, treated with adjuvant therapy without evidence of metastases, were enrolled for competitive Dragon Boat training. They underwent ergometric tests yearly, and 2D echocardiography to evaluate hemodynamic, morphological and functional cardiac parameters. The data were compared with those from a group of 36 healthy women (HW). Both groups maintained normal systolic function throughout the period, with Cardiac Mass index, Body Mass Index and Ejection Fraction values being higher in HW. At the onset of the study, the diastolic function of BC survivors was normal though compatible with initial diastolic dysfunction when compared to the diastolic function of HW. After 4 years of competitive activity, the diastolic parameters improved in both groups and particularly in BC survivors (A peak: from 68.5 ± 15.1 cm/s to 50 ± 14.1 cm/s, p sport activity in myocardial function of BC survivors.

  8. An Energy Management System of a Fuel Cell/Battery Hybrid Boat

    Directory of Open Access Journals (Sweden)

    Jingang Han

    2014-04-01

    Full Text Available All-electric ships are now a standard offering for energy/propulsion systems in boats. In this context, integrating fuel cells (FCs as power sources in hybrid energy systems can be an interesting solution because of their high efficiency and low emission. The energy management strategy for different power sources has a great influence on the fuel consumption, dynamic performance and service life of these power sources. This paper presents a hybrid FC/battery power system for a low power boat. The hybrid system consists of the association of a proton exchange membrane fuel cell (PEMFC and battery bank. The mathematical models for the components of the hybrid system are presented. These models are implemented in Matlab/Simulink environment. Simulations allow analyzing the dynamic performance and power allocation according to a typical driving cycle. In this system, an efficient energy management system (EMS based on operation states is proposed. This EMS strategy determines the operating point of each component of the system in order to maximize the system efficiency. Simulation results validate the adequacy of the hybrid power system and the proposed EMS for real ship driving cycles.

  9. Conformation of hindered piperidines: Spectroscopic evidence for contribution of boat conformations

    Indian Academy of Sciences (India)

    A Thangamani; J Jayabharathi; A Manimekalai

    2010-07-01

    High resolution 1H and 13C NMR resonance assignments and conformational assignments were carried out for four (3)-benzyl-(2),(6)-bis(aryl)piperidin-4-ones 1-4 and their four -nitroso-(3)-benzyl-(2),(6)-bis(aryl)piperidin-4-ones 5-8. In addition to conventional 1D NMR methods, 2D shiftcorrelated NMR techniques (1H-1H COSY and 1H-13C COSY) were used for signal assignments. At room temperature the (3)-benzyl-(2),(6)-bis(aryl)piperidin-4-ones 1-4 exist in only one isomeric form whereas their -nitroso derivatives 5-8 exist in two isomeric forms. The preferred conformations of both the isomeric forms of nitrosamines were determined by comparison of the spectral data with those of the corresponding parent amines 1-4 and with the aid of substituent parameters. The results indicate the presence of an equilibrium mixture of boat forms B1 and B2 for Z isomers of 5-8. For the E isomers of 5-8, boat form B1 is predicted to be the major conformer. The piperidin-4-ones 1-4 exist in normal chair conformations with equatorial orientations of all the substituents.

  10. Development of wing-in-ground effect craft 'Marine Slider' for high-speed boating and gliding for sports and pleasures

    Science.gov (United States)

    Matsubara, Takenori; Higashida, Akio; Matsuoka, Toshio; Yamaguchi, Nobuyuki; Uragami, Koichi

    1991-06-01

    A new type of high-speed boat for sports and recreational purposes developed by Mitsubishi Heavy Industries is presented. The boat is a wing-in-ground effect craft based on the principle of the ram-wing effect. It is capable of running faster than ordinary water-borne craft when its wave-generation resistance is eliminated.

  11. Trapping tsetse flies on water

    Directory of Open Access Journals (Sweden)

    Laveissière C.

    2011-05-01

    Full Text Available Riverine tsetse flies such as Glossina palpalis gambiensis and G. tachinoides are the vectors of human and animal trypanosomoses in West Africa. Despite intimate links between tsetse and water, to our knowledge there has never been any attempt to design trapping devices that would catch tsetse on water. In mangrove (Guinea one challenging issue is the tide, because height above the ground for a trap is a key factor affecting tsetse catches. The trap was mounted on the remains of an old wooden dugout, and attached with rope to nearby branches, thereby allowing it to rise and fall with the tide. Catches showed a very high density of 93.9 flies/”water-trap”/day, which was significantly higher (p < 0.05 than all the catches from other habitats where the classical trap had been used. In savannah, on the Comoe river of South Burkina Faso, the biconical trap was mounted on a small wooden raft anchored to a stone, and catches were compared with the classical biconical trap put on the shores. G. p. gambiensis and G. tachinoides densities were not significantly different from those from the classical biconical one. The adaptations described here have allowed to efficiently catch tsetse on the water, which to our knowledge is reported here for the first time. This represents a great progress and opens new opportunities to undertake studies on the vectors of trypanosomoses in mangrove areas of Guinea, which are currently the areas showing the highest prevalences of sleeping sickness in West Africa. It also has huge potential for tsetse control using insecticide impregnated traps in savannah areas where traps become less efficient in rainy season. The Guinean National control programme has already expressed its willingness to use such modified traps in its control campaigns in Guinea, as has the national PATTEC programme in Burkina Faso during rainy season.

  12. Treatment of fly ash for use in concrete

    Science.gov (United States)

    Boxley, Chett; Akash, Akash; Zhao, Qiang

    2013-01-08

    A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with an activator solution sufficient to initiate a geopolymerization reaction and for a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 35% of the foam index of the untreated fly ash, and in some cases less than 10% of the foam index of the untreated fly ash. The activator solution may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.

  13. Treatment of fly ash for use in concrete

    Science.gov (United States)

    Boxley, Chett; Akash, Akash; Zhao, Qiang

    2012-05-08

    A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with an activator solution sufficient to initiate a geopolymerization reaction and for a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 35% of the foam index of the untreated fly ash, and in some cases less than 10% of the foam index of the untreated fly ash. The activator solution may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.

  14. Treatment of fly ash for use in concrete

    Science.gov (United States)

    Boxley, Chett [Park City, UT

    2012-05-15

    A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with a quantity of spray dryer ash (SDA) and water to initiate a geopolymerization reaction and form a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 40%, and in some cases less than 20%, of the foam index of the untreated fly ash. An optional alkaline activator may be mixed with the fly ash and SDA to facilitate the geopolymerization reaction. The alkaline activator may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.

  15. Designing a Two-Phase BLDC Motor and Finite-Element Analysis of Designing a Controller in Order to Manoeuvre High-Speed Boats in Marine Turbulences

    Directory of Open Access Journals (Sweden)

    Mehrdad Jafarboland

    2014-01-01

    Full Text Available High speed boats are small kind of boats which are piloted with boatman.These boats are usually used in strategic commissions like military which fast speeds and good manoeuvrability are of essential importance.Rough sea path, marine turbulences and multi input multi output nonlinear dynamical model of this boats,make it very difficult to pilot and manoeuvre them.in this paper,.two controller are designed and proposed for pursuing desired path and manoeuvring fast speeds.Fuzzy controller is compared with the result of PID controller. Simulation results also indicate that these proposed controllers have suitable responses and can pilot the boat in the best manner.

  16. Sand Flies and Their Control Methods.

    Science.gov (United States)

    Çetin, Hüseyin; Özbel, Yusuf

    2017-06-01

    The main aim of managing arthropod vectors that carry the disease agents is interrupting the infection cycle. Therefore, the management of the disease implies that all precautions related to all elements (i.e., human, arthropod vector, and reservoir) in the infection cycle need to be taken. There are important points that need to be considered while dealing with sand flies (Diptera: Psychodidae: Phlebotominae), which in many regions worldwide, particularly in tropical and subtropical areas, are vectors of diseases such as leishmaniasis and sand fly fever and are the arthropods of the infection cycle. Because the larval control of the sand flies is very difficult and almost impossible, the management is mainly conducted for the adults. The most effective strategy for reducing both sand fly fever and leishmaniasis is managing sand flies, particularly in areas where humans are located. In this review, the morphology, biology, and taxonomy of sand flies; the integrated fighting and management methods such as insecticide-impregnated bed nets and use of curtains, zooprophylaxis, indoor and outdoor residual applications, larvicides, repellents, and insecticide-impregnated dog collars; and data regarding many issues such as insecticide resistance in sand flies have been emphasized on in the review.

  17. Fly ash-reinforced thermoplastic starch composites

    Energy Technology Data Exchange (ETDEWEB)

    Ma, X.F.; Yu, J.G.; Wang, N. [Tianjin University, Tianjin (China). School of Science

    2007-01-02

    As a by-product from the combustion of pulverized coal, fly ash was, respectively, used as the reinforcement for formamide and urea-plasticized thermoplastic starch (FUPTPS) and glycerol-plasticized thermoplastic starch (GPTPS). The introduction of fly ash improved tensile stress from 4.56 MPa to 7.78 MPa and Youngs modulus increased trebly from 26.8 MPa to 84.6 MPa for fly ash-reinforced FUPTPS (A-FUPTPS), while tensile stress increased from 4.55 MPa to 12.86 MPa and Youngs modulus increased six times from 76.4 MPa to 545 MPa for fly ash-reinforced GPTPS (A-GPTPS). X-ray diffractograms illustrated that fly ash destroyed the formation of starch ordered crystal structure, so both A-GPTPS and FUPTPS could resist the starch re-crystallization (retrogradation). Also fly ash improved water resistance of TPS. As shown by rheology, during the thermoplastic processing, the extruder screw speed effectively adjusted the flow behavior of A-FUPTPS, while the increasing of the processing temperature effectively ameliorated the flow behavior of A-GPTPS. However, superfluous ash contents (e.g., 20 wt%) worsened processing fluidity and resulted in the congregation of fly ash in FUPTPS matrix (tested by SEM) rather than in GPTPS matrix. This congregation decreased the mechanical properties and water resistance of the materials.

  18. Marijuana effects on simulated flying ability.

    Science.gov (United States)

    Janowsky, D S; Meacham, M P; Blaine, J D; Schoor, M; Bozzetti, L P

    1976-04-01

    The authors studied the effects of marijuana intoxication on the ability of 10 certified airplane pilots to operate a flight simulator. They used a randomized double-blind crossover design to compare the effect of active versus placebo marijuana. They found that all 10 pilots showed a significant decrease in measurements of flying performance 30 minutes after smoking active marijuana. For a group of 6 pilots tested sequentially for 6 hours, a nonsignificant decrease in flying performance continued for 2 hours after smoking the active drug. The authors conclude that the effects of marijuana on flying performance may represent a sensitive indicator of the drug's psychomotor effects.

  19. Flying Through Dust From Asteroids

    Science.gov (United States)

    Kohler, Susanna

    2016-11-01

    How can we tell what an asteroid is made of? Until now, weve relied on remote spectral observations, though NASAs recently launched OSIRIS-REx mission may soon change this by landing on an asteroid and returning with a sample.But what if we could learn more about the asteroids near Earth without needing to land on each one? It turns out that we can by flying through their dust.The aerogel dust collector of the Stardust mission. [NASA/JPL/Caltech]Ejected CluesWhen an airless body is impacted by the meteoroids prevalent throughout our solar system, ejecta from the body are flung into the space around it. In the case of small objects like asteroids, their gravitational pull is so weak that most of the ejected material escapes, forming a surrounding cloud of dust.By flying a spacecraft through this cloud, we could perform chemical analysis of the dust, thereby determining the asteroids composition. We could even capture some of the dust during a flyby (for example, by using an aerogel collector like in the Stardust mission) and bring it back home to analyze.So whats the best place to fly a dust-analyzing or -collecting spacecraft? To answer this, we need to know what the typical distribution of dust is around a near-Earth asteroid (NEA) a problem that scientists Jamey Szalay (Southwest Research Institute) and Mihly Hornyi (University of Colorado Boulder) address in a recent study.The colors show the density distribution for dust grains larger than 0.3 m around a body with a 10-km radius. The distribution is asymmetric, with higher densities on the apex side, shown here in the +y direction. [Szalay Hornyi 2016]Moon as a LaboratoryTo determine typical dust distributions around NEAs, Szalay and Hornyi first look at the distribution of dust around our own Moon, caused by the same barrage of meteorites wed expect to impact NEAs. The Moons dust cloud was measured in situ in 2013 and 2014 by the Lunar Dust Experiment (LDEX) on board the Lunar Atmosphere and Dust Environment

  20. A modified FitzHugh-Nagumo model for cardiac instabilities: The replacement of a conductance variable with Ca current as a slow variable

    Science.gov (United States)

    Osaka, Motohisa

    2013-02-01

    The FitzHugh-Nagumo model of nerve conduction is also used as a model of cardiac excitability. We propose the replacement of a gating variable of the conductance of K+ current with Ca2+ current as a slow variable of the model, in which plays a key role in the cardiac action potential. Since ion currents conduct transversely as well as longitudinally through gap junctions between myocytes, particularly in ischemia, a respective diffusion term is involved to both equations of a fast variable and a slow variable. We show that only a small increase of a coefficient of the diffusion term of Ca2+ current may cause cardiac instabilities, which are presumed to cause breakup of conduction and finally a lethal arrhythmia, ventricular fibrillation. Particularly, these instabilities do not occur without the diffusion term of Ca2+ current.

  1. Aerodynamic Characteristics of a Refined Deep-Step Planing-Tail Flying-Boat Hull with Various Forebody and Afterbody Shapes

    Science.gov (United States)

    Riebe, John M; Naeseth, Rodger L

    1953-01-01

    An investigation was made in the Langley 300 mph 7-by 10-foot tunnel to determine the aerodynamic characteristics of a refined deep-step planing-tail hull with various forebody and afterbody shapes. For comparison, tests were made on a streamline body simulating the fuselage of a modern transport airplane. The results of the tests, which include the interference effects of a 21-percent-thick support wing, indicated that for corresponding configurations the hull models incorporating a forebody with a length-beam ratio of 7 had lower minimum drag coefficients than the hull models incorporating a forebody with a length-beam ratio of 5. Longitudinal and lateral stability was generally about the same for all hull models tested and about the same as that of a conventional hull.

  2. Performance evaluation of photovoltaic boats in an early design stage: numerical simulations with industrial design engineering methods

    NARCIS (Netherlands)

    Gorter, Tim

    2014-01-01

    In order to reduce the need for fossil fuels for transport, alternative ways of meeting the energy demand for transport are required. The Province of Friesland in The Netherlands has developed into a niche sector for Photovoltaic (PV) boats among others to also reduce CO2 emissions in transport. Exa

  3. extrap: Software to assist the selection of extrapolation methods for moving-boat ADCP streamflow measurements

    Science.gov (United States)

    Mueller, David S.

    2013-01-01

    Selection of the appropriate extrapolation methods for computing the discharge in the unmeasured top and bottom parts of a moving-boat acoustic Doppler current profiler (ADCP) streamflow measurement is critical to the total discharge computation. The software tool, extrap, combines normalized velocity

  4. 40 CFR 63.5755 - How do I demonstrate compliance with the aluminum recreational boat surface coating spray gun...

    Science.gov (United States)

    2010-07-01

    ... the aluminum recreational boat surface coating spray gun cleaning work practice standards? 63.5755... surface coating spray gun cleaning work practice standards? You must demonstrate compliance with the aluminum coating spray gun cleaning work practice standards by meeting the requirements of paragraph (a) or...

  5. 40 CFR 63.5752 - How do I calculate the organic HAP content of aluminum recreational boat surface coatings?

    Science.gov (United States)

    2010-07-01

    ... the organic HAP content of aluminum recreational boat surface coatings? (a) Use equation 1 of this... 12 months. ER22AU01.017 Where: HAPSC = weighted-average organic HAP content for all aluminum coating materials, kilograms of organic HAP per liter of coating solids. m = number of different aluminum...

  6. Performance evaluation of photovoltaic boats in an early design stage: numerical simulations with industrial design engineering methods

    NARCIS (Netherlands)

    Gorter, Tim

    2014-01-01

    In order to reduce the need for fossil fuels for transport, alternative ways of meeting the energy demand for transport are required. The Province of Friesland in The Netherlands has developed into a niche sector for Photovoltaic (PV) boats among others to also reduce CO2 emissions in transport.

  7. 76 FR 26931 - Safety Zone; Second Annual Space Coast Super Boat Grand Prix, Atlantic Ocean, Cocoa Beach, FL

    Science.gov (United States)

    2011-05-10

    ... Prix, Atlantic Ocean, Cocoa Beach, FL AGENCY: Coast Guard, DHS. ACTION: Temporary final rule. SUMMARY... Cocoa Beach, Florida during the Second Annual Space Coast Super Boat Grand Prix. The Second Annual Space... will be held on the waters of the Atlantic Ocean east of Cocoa Beach, Florida. Approximately 30...

  8. 40 CFR 1045.660 - How do I certify outboard or personal watercraft engines for use in jet boats?

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 32 2010-07-01 2010-07-01 false How do I certify outboard or personal watercraft engines for use in jet boats? 1045.660 Section 1045.660 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR POLLUTION CONTROLS CONTROL OF EMISSIONS FROM SPARK-IGNITION PROPULSION MARINE ENGINES AND VESSELS...

  9. Around a camphoric-acid boat, is the surfactant adsorbed on to the interface or dissolved in the bulk?

    Science.gov (United States)

    Mandre, Shreyas; Akella, Sathish; Singh, Dhiraj; Singh, Ravi; Bandi, Mahesh

    2016-11-01

    A camphoric-acid boat (c-boat for short), a cylindrical gel tablet infused with camphoric acid, moves spontaneously when placed on an air-water interface. This system is a classic example of propulsion driven by Marangoni forces. Despite rich history on particles propelled by Marangoni forces, including contributions by figures such as Benjamin Franklin, Allesandro Volta, and Giovanni Venturi, the underlying fluid dynamics remains poorly understood. A key missing piece is the nature of the surfactant; in our case, the question is whether the camphoric acid is dissolved in the bulk or adsorbed on to the interface. We gain insight into this piece by holding the c-boat stationary and measuring the surrounding axisymmetric flow velocity to a precision needed to distinguish between the two possibilities. For soluble surfactants, it is known that the velocity field decays as r - 2 / 3, where r is the distance from the center of the c-boat. Whereas, for surfactant adsorbed on to the air-water interface, we derive that the surrounding velocity fields decays as r - 3 / 5. Based on our measurements we deduce that, even though soluble in water, the Marangoni flow results from a layer of camphoric acid adsorbed to the air-water interface.

  10. 26 CFR 301.6050A-1 - Information returns regarding services performed by certain crewmen on fishing boats.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 18 2010-04-01 2010-04-01 false Information returns regarding services... ADMINISTRATION Information and Returns Returns and Records § 301.6050A-1 Information returns regarding services... information regarding services performed by certain crewmen on fishing boats, see § 1.6050A-1 of this...

  11. 78 FR 60698 - Safety Zone, Lucas Oil Drag Boat Racing Series; Thompson Bay, Lake Havasu City, AZ.

    Science.gov (United States)

    2013-10-02

    ... issue a rule without prior notice and opportunity to comment when the agency for good cause finds that... rulemaking (NPRM) with respect to this rule because the logistical details of the Lucas Oil Drag Boat Racing... 13, 2013. (c) Definitions. The following definition applies to this section: designated...

  12. Snowballing and flying under the radar

    DEFF Research Database (Denmark)

    Pötz, Katharina Anna; Hjortsø, Carsten Nico Portefée

    2013-01-01

    management and venture development paths. More specifically, flying under radar in terms of operating under lower institutional requirements, and slowly accumulating resources (snowballing) are major leveraging strategies. We integrate our results into a hypothesized framework for resource management in East...

  13. Tsetse fly microbiota: form and function

    Directory of Open Access Journals (Sweden)

    Jingwen eWang

    2013-10-01

    Full Text Available Tsetse flies are the primary vectors of African trypanosomes, which cause Human and Animal African trypanosomiasis in 36 countries in sub-Saharan Africa. These flies have also established symbiotic associations with bacterial and viral microorganisms. Laboratory-reared tsetse flies harbor up to four vertically transmitted organisms - obligate Wigglesworthia, commensal Sodalis, parasitic Wolbachia and Salivary Gland Hypertrophy Virus (SGHV. Field-captured tsetse can harbor these symbionts as well as environmentally acquired commensal bacteria. This microbial community influences several aspects of tsetse’s physiology, including nutrition, fecundity and vector competence. This review provides a detailed description of tsetse’s microbiome, and describes the physiology underlying host-microbe, and microbe-microbe, interactions that occur in this fly.

  14. Dynamic Optimization Algorithm for Flying Trajectory of a Free-flying Space Robot

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    A new method of dynamic optimization for the flying trajectory of a free-flying space robot based on its flying motion characteristics is presented. The continuous flying trajectory is broken into a number of segment and the control efforts and the duration of the segment are chosen as the optimization parameters. The objective function is made by using the weighted sum of the fuel used and the time spent, and the constraint equations are selected. Finally, the internal point punishment function method is adopted in the optimization program, and the results of computer simulation are given.

  15. Effect of Fly Ash on the Electrical Conductivity of Concretes

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The fly ash occasionally has high content of iron oxide and carbon that are good electrical conducting components. This paper investigates the effect of the fly ash used as mineral admixtures on the electrical conductivity of concretes. The electrical properties of concretes using 3 kinds of fly ash with different iron oxide contents have been studied. Experimental results show that at the same fly ash dosage the resistivity of concrete using fly ash with high content of iron oxide is slightly lower than that with low content of iron oxide. However, the concrete resistivity after 14d increases as fly ash dosage increases regardless of iron oxide content in fly ash.

  16. Relativistic Tennis Using Flying Mirror

    Science.gov (United States)

    Pirozhkov, A. S.; Kando, M.; Esirkepov, T. Zh.; Ma, J.; Fukuda, Y.; Chen, L.-M.; Daito, I.; Ogura, K.; Homma, T.; Hayashi, Y.; Kotaki, H.; Sagisaka, A.; Mori, M.; Koga, J. K.; Kawachi, T.; Daido, H.; Bulanov, S. V.; Kimura, T.; Kato, Y.; Tajima, T.

    2008-06-01

    Upon reflection from a relativistic mirror, the electromagnetic pulse frequency is upshifted and the duration is shortened by the factor proportional to the relativistic gamma-factor squared due to the double Doppler effect. We present the results of the proof-of-principle experiment for frequency upshifting of the laser pulse reflected from the relativistic "flying mirror", which is a wake wave near the breaking threshold created by a strong driver pulse propagating in underdense plasma. Experimentally, the wake wave is created by a 2 TW, 76 fs Ti:S laser pulse from the JLITE-X laser system in helium plasma with the electron density of ≈4-6×1019 cm-3. The reflected signal is observed with a grazing-incidence spectrograph in 24 shots. The wavelength of the reflected radiation ranges from 7 to 14 nm, the corresponding frequency upshifting factors are ˜55-115, and the gamma-factors are y = 4-6. The reflected signal contains at least 3×107 photons/sr. This effect can be used to generate coherent high-frequency ultrashort pulses that inherit temporal shape and polarization from the original (low-frequency) ones. Apart from this, the reflected radiation contains important information about the wake wave itself, e.g. location, size, phase velocity, etc.

  17. Biomass fly ash in concrete: Mixture proportioning and mechanical properties

    Energy Technology Data Exchange (ETDEWEB)

    Shuangzhen Wang; Amber Miller; Emilio Llamazos; Fernando Fonseca; Larry Baxter [Brigham Young University, Provo, UT (USA). Department of Chemical Engineering

    2008-03-15

    ASTM C 618 prohibits use of biomass fly ashes in concrete. This document compares the properties of biomass fly ashes from cofired (herbaceous with coal), pure wood combustion and blended (pure wood fly ash blended with coal fly ash) to those of coal fly ash in concrete. The results illustrate that with 25% replacement (wt%) of cement by fly ash, the compressive strength (one day to one year) and the flexure strength (at 56th day curing) of cofired and blended biomass fly ash concrete is statistically equal to that of two coal fly ash concrete in this investigation (at 95% confidence interval). This implies that biomass fly ash with co-firing concentration within the concentration interest to commercial coal-biomass co-firing operations at power plants and blended biomass fly ash within a certain blending ratio should be considered in concrete. 37 refs., 10 figs., 2 tabs.

  18. My Friendship with the Flying Tigers

    Institute of Scientific and Technical Information of China (English)

    Jiang; Yingshan

    2015-01-01

    "I believe I owe a debt to the Chinese people...It’s so huge there’s no way I can pay it back."This is what Flying Tigers pilot Glen Beneda said to his family time and again.I have been working in the CPAFFC for over 10 years now,and my feelings for the Flying Tigers have deepened over time.I had heard of its

  19. Settling characteristics of some Indian fly ash

    Energy Technology Data Exchange (ETDEWEB)

    Jain, M.K.; Sastry, B.S. [Indian Institute of Technology, Kharapur (India). Dept. of Mining Engineering

    2003-07-01

    The paper examines the aspects of the solid liquid separation (settling characteristics) of some of the fly ash obtained from coal-fired power plants in India. The application of a coagulating or flocculating agent (polymer) to improve the two properties as indicated is a typical industrial practice. The sources for this study comprise of fly ash, pond ash, and bottom ash and the settling characteristics are studied in conjunction with the flocculating agent polyacrylamide. 4 refs., 4 figs., 3 tabs.

  20. As and Se interactions with fly ashes

    Directory of Open Access Journals (Sweden)

    M. Díaz-Somoano

    2012-03-01

    Full Text Available Arsenic and selenium are toxic elements present incoal in trace concentrations that may be emitted tothe environment during coal conversion processes.However, it is possible to retain volatile arsenic andselenium compounds in the fly ashes originated bythe process, the proportions retained depending onthe characteristics of the ashes and processconditions. This work is focused on the capture ofthese elements in fly ashes in simulated coalcombustion and gasification atmospheres inlaboratory scale reactors.

  1. Extraction, partial characterization and bioactivity of polysaccharides from boat-fruited sterculia seeds.

    Science.gov (United States)

    Ai, Lianzhong; Wu, Jinhong; Che, Na; Wu, Yan; Cui, Steve W

    2012-12-01

    Three polysaccharides (water-soluble (WSP), alkali-soluble (ASP) and insoluble (IMP)) from boat-fruited sterculia seeds were obtained using different extraction methods. Moisture, ash, protein and total carbohydrate content of WSP, ASP and IMP were analyzed. WSP was rich in glucose, rhamnose, arabinose and galactose while small amount of xylose was also detected. The monosaccharide composition as well its relative content for WSP and ASP were similar. The intrinsic viscosity results demonstrated that ASP had much lower intrinsic viscosity than WSP, indicating partial polysaccharides were degraded into low molecular weight polymers during alkaline extraction. The acute anti-inflammatory bioactive results of polysaccharides indicated that WSP demonstrated an inhibitive effect toward acute inflammation.

  2. The Welenrengnge Boat Model: Maritim Character Building Of Higher Education In Indonesia

    Directory of Open Access Journals (Sweden)

    AB Takko Bandung

    2016-12-01

    Full Text Available This study is a cultural research using a descriptive qualitative design, namely Maritim character values in the script of Sawerigading Voyage to China is profoundly classified, interpreted, and described. The research result shows that Welenrengnge can be utilized in order to implement the Maritim character for Hasanuddin University academicians and it has been tested to students at Faculty of Humanities, Hasanuddin University. Based on the scenario, the stages to achieve the Maritim character, what is always heard, seen, read, reviewed, discussed and performed is obsessed into everybody’s personality so the self-character can be changed and shaped either individually or collectively. Therefore, this model is called the Welenrengnge Boat Model. Seizing the Maritim character requires a considerable time. The experimental research shows that the students generation of 2014 of Indonesian Literature Department of Faculty of Humanities have commenced to build the Maritim character.

  3. Design of Heat Pipe Type Adsorption Ice Maker for Fishing Boats

    Institute of Scientific and Technical Information of China (English)

    王丽伟; 王如竹; 夏再忠; 吴静怡

    2005-01-01

    A heat pipe type adsorption ice maker with two adsorbers for fishing boats is designed by using ammonia as refrigerant and compound of activated carbon-GaG12 as adsorbent. This type of heat pipe adsorber can solve the problem of incompatibility between ammonia, copper, seawater and steel. The working process of the ice maker with 8.7kg adsorbent per bed is simulated. The results show that the optimal semi-cycle time is about 9min at the evaporating temperature of -15℃, where the corresponding cooling power, specific cooling power per kilogram adsorbent SCP and coefficient of refrigerant performance COP are respectively 3.6 kW, 217 W·kg-1 and 0.404.

  4. A comparison of the impact of 'seagrass-friendly' boat mooring systems on Posidonia australis.

    Science.gov (United States)

    Demers, Marie-Claire A; Davis, Andrew R; Knott, Nathan A

    2013-02-01

    Permanent boat moorings have contributed to the decline of seagrasses worldwide, prompting the development of 'seagrass-friendly' moorings. We contrasted seagrass cover and density (predominantly Posidonia australis) in the vicinity of three mooring types and nearby reference areas lacking moorings in Jervis Bay, Australia. We examined two types of 'seagrass-friendly' mooring and a conventional 'swing' mooring. 'Swing' moorings produced significant seagrass scour, denuding patches of ~9 m radius. Seagrass-friendly 'cyclone' moorings produced extensive denuded patches (average radius of ~18 m). Seagrass-friendly 'screw' moorings, conversely, had similar seagrass cover to nearby reference areas. Our findings reinforce previous work highlighting the negative effects of 'swing' and 'cyclone' moorings. In contrast, the previously unstudied 'screw' moorings were highly effective. We conclude that regular maintenance of moorings and the monitoring of surrounding seagrass are required to ensure that 'seagrass-friendly' moorings are operating effectively. This is important, as following damage Posidonia will take many decades to recover.

  5. Wolbachia in Anastrepha fruit flies (Diptera: Tephritidae).

    Science.gov (United States)

    Coscrato, Virginia E; Braz, Antônio S K; P Perondini, André L; Selivon, Denise; Marino, Celso L

    2009-09-01

    Endosymbiotic bacteria of the genus Wolbachia are widespread among arthropods and cause a variety of reproductive abnormalities, such as cytoplasmic incompatibility, thelytokous parthenogenesis, male-killing, and host feminization. In this study, we used three sets of Wolbachia-specific primers (16S rDNA, ftsZ, and wsp) in conjunction with the polymerase chain reaction (PCR), cloning and sequencing to study the infection of fruit flies (Anastrepha spp. and Ceratitis capitata) by Wolbachia. The flies were collected at several localities in Brazil and at Guayaquil, Ecuador. All of the fruit flies studied were infected with Wolbachia supergroup A, in agreement with the high prevalence of this group in South America. Phylogenetic analysis showed that the wsp gene was the most sensitive gene for studying the relationships among Wolbachia strains. The Wolbachia sequences detected in these fruit flies were similar to those such as wMel reported for other fruit flies. These results show that the infection of Anastrepha fruit flies by Wolbachia is much more widespread than previously thought.

  6. 76 FR 26654 - Movement of Hass Avocados From Areas Where Mediterranean Fruit Fly or South American Fruit Fly Exist

    Science.gov (United States)

    2011-05-09

    ... Avocados From Areas Where Mediterranean Fruit Fly or South American Fruit Fly Exist AGENCY: Animal and... from Mediterranean fruit fly quarantined areas in the United States with a certificate if the fruit is... quarantine regulations to remove trapping requirements for Mediterranean fruit fly for Hass avocados...

  7. Energy cost and efficiency of Venetian rowing on a traditional, flat hull boat (Bissa).

    Science.gov (United States)

    Capelli, Carlo; Tarperi, C; Schena, F; Cevese, A

    2009-03-01

    The total net metabolic power output (E, kW) required to scull a traditional, flat hull boat--the "Bissa", 9.02 m long and weighting about 500 kg including the crew-was assessed at different constant speeds (nu) ranging from 2.44 to 3.75 m s(-1). E increased with the speed: E = 0.417 x e (0.664v ); r (2) = 0.931. The amount of metabolic energy spent per unit distance (C, J m(-1)) to move the "Bissa", calculated by dividing E by the corresponding nu, was a linear function of nu: C = 0.369 nu -0.063; r (2) = 0.821. The hydrodynamic resistance met by the boat in the water--drag (D, N)--was estimated by analysing the decay of the reciprocal of nu as a function of time measured during several spontaneous deceleration tests carried out in still water and by knowing the total mass of the watercraft plus crew. D increased as a square function of speed: D = 12.76 v (2). This allowed us to calculate the drag efficiency (g(d)), as the ratio of D to C: g(d) increased from 8.9 to 13.7% in the range of the speeds tested. The "Bissa" turned out to be as economical as other flat hull, traditional watercrafts, such as the bigger Venetian gondola, and her g(d) was similar to that of other modern and traditional watercrafts.

  8. Effects of tour boats on dolphin activity examined with sensitivity analysis of Markov chains.

    Science.gov (United States)

    Dans, Silvana Laura; Degrati, Mariana; Pedraza, Susana Noemí; Crespo, Enrique Alberto

    2012-08-01

    In Patagonia, Argentina, watching dolphins, especially dusky dolphins (Lagenorhynchus obscurus), is a new tourist activity. Feeding time decreases and time to return to feeding after feeding is abandoned and time it takes a group of dolphins to feed increase in the presence of boats. Such effects on feeding behavior may exert energetic costs on dolphins and thus reduce an individual's survival and reproductive capacity or maybe associated with shifts in distribution. We sought to predict which behavioral changes modify the activity pattern of dolphins the most. We modeled behavioral sequences of dusky dolphins with Markov chains. We calculated transition probabilities from one activity to another and arranged them in a stochastic matrix model. The proportion of time dolphins dedicated to a given activity (activity budget) and the time it took a dolphin to resume that activity after it had been abandoned (recurrence time) were calculated. We used a sensitivity analysis of Markov chains to calculate the sensitivity of the time budget and the activity-resumption time to changes in behavioral transition probabilities. Feeding-time budget was most sensitive to changes in the probability of dolphins switching from traveling to feeding behavior and of maintaining feeding behavior. Thus, an increase in these probabilities would be associated with the largest reduction in the time dedicated to feeding. A reduction in the probability of changing from traveling to feeding would also be associated with the largest increases in the time it takes dolphins to resume feeding. To approach dolphins when they are traveling would not affect behavior less because presence of the boat may keep dolphins from returning to feeding. Our results may help operators of dolphin-watching vessels minimize negative effects on dolphins.

  9. Intrinsic Membrane Targeting of the Flagellar Export ATPase FliI: Interaction with Acidic Phospholipids and FliH

    OpenAIRE

    Auvray, Frédéric; Ozin, Amanda J.; Claret, Laurent; Hughes, Colin

    2002-01-01

    The specialised ATPase FliI is central to export of flagellar axial protein subunits during flagellum assembly. We establish the normal cellular location of FliI and its regulatory accessory protein FliH in motile Salmonella typhimurium, and ascertain the regions involved in FliH2/FliI heterotrimerisation. Both FliI and FliH localised to the cytoplasmic membrane in the presence and in the absence of proteins making up the flagellar export machinery and basal body. Membrane association was tig...

  10. Direct regulation of BCL-2 by FLI-1 is involved in the survival of FLI-1-transformed erythroblasts

    OpenAIRE

    Lesault, Isabelle; Tran Quang, Christine; Frampton, Jon; Ghysdael, Jacques

    2002-01-01

    Rearrangement of the FLI-1 locus with ensuing overexpression of FLI-1 is an early event in Friend murine leukemia virus-induced disease. When overexpressed in primary erythroblasts, FLI-1 blocks erythropoeitin (Epo)-induced terminal differentiation and inhibits apoptosis normally induced in response to Epo withdrawal. We show here that the survival-inducing property of FLI-1 is associated with increased transcription of BCL-2. We further show that FLI-1 binds BCL-2 promoter sequences in trans...

  11. Expression of defensin paralogs across house fly life history: insights into fly-microbe interactions

    Science.gov (United States)

    House flies have a life-long association with microbe-rich environments. Larvae directly ingest bacteria in decaying substrates utilizing them for nutritional purposes. Adult house flies ephemerally associate with microbes, ingesting them either by direct feeding or indirectly during grooming. The h...

  12. Oral and Topical Toxicity of Fipronil to Melon Fly and Oriental Fruit Fly (Diptera: Tephritidae)

    Science.gov (United States)

    BACKGROUND: The objective of this study was to develop basic oral and topical toxicity data for Fipronil in Solulys protein bait to wild melon fly, Bactrocera cucurbitae (Coquillett) and the oriental fruit fly, Bactrocera dorsalis (Hendel). RESULTS: For the oral study, both females and males were ...

  13. PROBA-3: Precise formation flying demonstration mission

    Science.gov (United States)

    Llorente, J. S.; Agenjo, A.; Carrascosa, C.; de Negueruela, C.; Mestreau-Garreau, A.; Cropp, A.; Santovincenzo, A.

    2013-01-01

    Formation Flying (FF) has generated a strong interest in many space applications, most of them involving a significant complexity for building for example on-board large "virtual structures or distributed observatories". The implementation of these complex formation flying missions with critical dependency on this new, advanced and critical formation technology requires a thorough verification of the system behaviour in order to provide enough guarantees for the target mission success. A significant number of conceptual or preliminary designs, analyses, simulations, and HW on-ground testing have been performed during the last years, but still the limitations of the ground verification determine that enough confidence of the behaviour of the formation flying mission will only be possible by demonstration in flight of the concept and the associated technologies. PROBA-3 is the mission under development at ESA for in-flight formation flying demonstration, dedicated to obtain that confidence and the necessary flight maturity level in the formation flying technologies for those future target missions. PROBA-3 will demonstrate technologies such as formation metrology sensors (from very coarse to highest accuracy), formation control and GNC, system operability, safety, etc. During the last years, PROBA-3 has evolved from the initial CDF study at ESA, to two parallel phase A studies, followed by a change in the industrial configuration for the Bridging step between A and B phases. Currently the SRR consolidation has been completed, and the project is in the middle of the phase B. After the phase A study SENER and GMV were responsible for the Formation Flying System, within a mission core team completed by OHB-Sweden, QinetiQ Space and CASA Espacio. In this paper an overview of the PROBA-3 mission is provided, with a more detailed description of the formation flying preliminary design and results.

  14. Characteristics of MSWI fly ash during vitrification

    Institute of Scientific and Technical Information of China (English)

    TIAN Shu-lei; WANG Qi; WANG Qun-hui; MA Hong-zhi

    2009-01-01

    The vitrification characteristics of municipal solid waste incinerator (MSWI) fly ash were investigated. Effects of temperature on the binding efficiency of heavy metals, the change of chemical compositions and the weight loss of fly ash in the range of 800 - 1350 ℃ were studied. Toxicity Characteristic Leaching Procedure (TCLP) of the United States was used to analyze the leaching characteristics of heavy metals in fly ash and molten slag. Results indicate that chemical compositions, the weight loss of fly ash and the binding efficiency of heavy metals in fly ash have a tremendous change in the range of 1150 - 1260 ℃. The percentage of CaO, SiO2and AI203 increases with the increasing temperature, whereas it is contrary for SO3 , K2O, Na20 and CI; especially when the temperature is 1260 ℃, the percentage of these four elements decreases sharply from 43.72%to 0. 71%. The weight loss occurs obviously in the range of 1150 - 1260 ℃. Heavy metals of Pb and Cd are almost vaporized above 1000 ℃. Cr is not volatile and its binding efficiency can reach 100% below 1000 ℃. Resuits of TCLP indicate that the heavy metal content of molten slag is beyond stipulated limit values.

  15. Social attraction mediated by fruit flies' microbiome.

    Science.gov (United States)

    Venu, Isvarya; Durisko, Zachary; Xu, Jianping; Dukas, Reuven

    2014-04-15

    Larval and adult fruit flies are attracted to volatiles emanating from food substrates that have been occupied by larvae. We tested whether such volatiles are emitted by the larval gut bacteria by conducting tests under bacteria-free (axenic) conditions. We also tested attraction to two bacteria species, Lactobacillus brevis, which we cultured from larvae in our lab, and L. plantarum, a common constituent of fruit flies' microbiome in other laboratory populations and in wild fruit flies. Neither larvae nor adults showed attraction to axenic food that had been occupied by axenic larvae, but both showed the previously reported attraction to standard food that had been occupied by larvae with an intact microbiome. Larvae also showed significant attraction to volatiles from axenic food and larvae to which we added only either L. brevis or L. plantarum, and volatiles from L. brevis reared on its optimal growth medium. Controlled learning experiments indicated that larvae experienced with both standard and axenic used food do not perceive either as superior, while focal larvae experienced with simulated used food, which contains burrows, perceive it as superior to unused food. Our results suggest that flies rely on microbiome-derived volatiles for long-distance attraction to suitable food patches. Under natural settings, fruits often contain harmful fungi and bacteria, and both L. brevis and L. plantarum produce compounds that suppress the growth of some antagonistic fungi and bacteria. The larval microbiome volatiles may therefore lead prospective fruit flies towards substrates with a hospitable microbial environment.

  16. Investigation of gliding flight by flying fish

    Science.gov (United States)

    Park, Hyungmin; Jeon, Woo-Pyung; Choi, Haecheon

    2006-11-01

    The most successful flight capability of fish is observed in the flying fish. Furthermore, despite the difference between two medium (air and water), the flying fish is well evolved to have an excellent gliding performance as well as fast swimming capability. In this study, flying fish's morphological adaptation to gliding flight is experimentally investigated using dry-mounted darkedged-wing flying fish, Cypselurus Hiraii. Specifically, we examine the effects of the pectoral and pelvic fins on the aerodynamic performance considering (i) both pectoral and pelvic fins, (ii) pectoral fins only, and (iii) body only with both fins folded. Varying the attack angle, we measure the lift, drag and pitching moment at the free-stream velocity of 12m/s for each case. Case (i) has higher lift-to-drag ratio (i.e. longer gliding distance) and more enhanced longitudinal static stability than case (ii). However, the lift coefficient is smaller for case (i) than for case (ii), indicating that the pelvic fins are not so beneficial for wing loading. The gliding performance of flying fish is compared with those of other fliers and is found to be similar to those of insects such as the butterfly and fruitfly.

  17. Energy Saving and Environmental Efficiency for Hugh Volume Fly Ash Sintered Brick%高掺量粉煤灰烧结砖的节能与环境效益

    Institute of Scientific and Technical Information of China (English)

    李庆繁; 罗维滨; 李思胜

    2004-01-01

    这里所说高掺量粉煤灰烧结砖,是指原料组成是以粉煤灰为主,即粉煤灰掺量质量比应不小于50%的粉煤灰烧结砖。现就高掺量粉煤灰烧结砖的节能和环境效益进行专题讨论。

  18. FlyBase: improvements to the bibliography.

    Science.gov (United States)

    Marygold, Steven J; Leyland, Paul C; Seal, Ruth L; Goodman, Joshua L; Thurmond, Jim; Strelets, Victor B; Wilson, Robert J

    2013-01-01

    An accurate, comprehensive, non-redundant and up-to-date bibliography is a crucial component of any Model Organism Database (MOD). Principally, the bibliography provides a set of references that are specific to the field served by the MOD. Moreover, it serves as a backbone to which all curated biological data can be attributed. Here, we describe the organization and main features of the bibliography in FlyBase (flybase.org), the MOD for Drosophila melanogaster. We present an overview of the current content of the bibliography, the pipeline for identifying and adding new references, the presentation of data within Reference Reports and effective methods for searching and retrieving bibliographic data. We highlight recent improvements in these areas and describe the advantages of using the FlyBase bibliography over alternative literature resources. Although this article is focused on bibliographic data, many of the features and tools described are applicable to browsing and querying other datasets in FlyBase.

  19. Attracting the attention of a fly.

    Science.gov (United States)

    Sareen, Preeti; Wolf, Reinhard; Heisenberg, Martin

    2011-04-26

    Organisms with complex visual systems rarely respond to just the sum of all visual stimuli impinging on their eyes. Often, they restrict their responses to stimuli in a temporarily selected region of the visual field (selective visual attention). Here, we investigate visual attention in the fly Drosophila during tethered flight at a torque meter. Flies can actively shift their attention; however, their attention can be guided to a certain location by external cues. Using visual cues, we can direct the attention of the fly to one or the other of the two visual half-fields. The cue can precede the test stimulus by several seconds and may also be spatially separated from the test by at least 20° and yet attract attention. This kind of external guidance of attention is found only in the lower visual field.

  20. Pigments of fly agaric (Amanita muscaria).

    Science.gov (United States)

    Stintzing, Florian; Schliemann, Willibald

    2007-01-01

    The complex pigment pattern of fly agaric (Amanita muscaria) cap skins has been studied by LC-DAD and mass spectrometry. Among the betaxanthins the corresponding derivatives of serine, threonine, ethanolamine, alanine, Dopa, phenylalanine and tryptophan are reported for the first time to contribute to the pigment pattern of fly agarics. Betalamic acid, the chromophoric precursor of betaxanthins and betacyanins, muscaflavin and seco-dopas were also detected. Furthermore, the red-purple muscapurpurin and the red muscarubrin were tentatively assigned while further six betacyanin-like components could not be structurally allocated. Stability studies indicated a high susceptibility of pigment extracts to degradation which led to rapid colour loss thus rendering a complete characterization of betacyanin-like compounds impossible at present. Taking into account these difficulties the presented results may be a starting point for a comprehensive characterization of the pigment composition of fly agarics.