A5091756748- Marine and fisheries research
- Sensor Technology and Measurement Systems
- Advancements in PLL and VCO Technologies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Power Line Communications and Noise
- Advanced MEMS and NEMS Technologies
- CCD and CMOS Imaging Sensors
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Fish Ecology and Management Studies
- Electromagnetic Compatibility and Noise Suppression
- Semiconductor Lasers and Optical Devices
- Acoustic Wave Resonator Technologies
- Marine Bivalve and Aquaculture Studies
- Analog and Mixed-Signal Circuit Design
- Advanced Electrical Measurement Techniques
- RFID technology advancements
- Marine Biology and Ecology Research
- Experimental Learning in Engineering
- Non-Invasive Vital Sign Monitoring
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- Protist diversity and phylogeny
- Metallurgy and Cultural Artifacts
Warsaw University of Technology
2005-2020
University of Warsaw
2004
Directorate of Fisheries
1958-1974
Lowestoft Hospital
1951-1965
Of the characters used for stock differentiation in North Sea herring, fecundity studies have proved confusing to general picture of separation into three major stocks, Bank, Downs and Buchan. By combining counts with length, a index has resulted which clearly discriminates between Bank fish. The been separate these two stocks mixed Shields fishery. proportions determined by this method compared well those derived from other methods. fecundity/length relationship obtained here is...
Since 1980 there has been a sudden recovery of recruitment to the central and southern North Sea herring stocks (Bank Downs, respectively). In contrast, northern continued at low level spawning stock biomass even declined since 1979. These events underline independence substocks in Sea, each which reacted differently cessation directed fishery 1977. A precondition reopening was that severely depleted should have recovered 800 000 t, underlying assumption being all components would respond...
A tentative method for separating North Sea herring stocks is described. The total numbers of white skeletal muscle fibres were counted in transverse section at a point 35% the length from tail. Counts two successive years showed no significant difference particular stocks. In five mean fibre counts 1969 and 1970 combined as follows: Bank, 64409; Shetland, 51472; Downs, 40584; Blackwater, 33934 Buchan, 44979. provides confirmatory evidence homogeneity spawning
"Pi of the Sky" is a detector designed for search optical flashes cosmic origin in sky. Its primary goal to look afterglows associated with gamma ray bursts (GRB) but it capable detect also other transients extragalactic origin. The apparatus consists two arrays 16 cameras each, which allow simultaneous observation large part Thanks on-line data analysis real time, has self-triggering capability and can react external triggers negative time delay. prototype been installed at Las Campanas...
In conventional photoacoustic setups, the signal results from stimulation of a sample placed in cell by light modulated at selected frequency. The can be amplified resonance cell. For this purpose, different types acoustic resonators are used. Acoustic passive, frequency selective elements. An resonator used offers opportunity to design system working on basis similar that self-oscillating generator. geometrical dimensions an resonator, and temperature, composition, concentration substances...
Journal Article Studies on the Dunmore Herring Stock: 1. A Population Assessment Get access A. C. Burd, Burd 1Fisheries LaboratoryLowestoft Search for other works by this author on: Oxford Academic Google Scholar J. Bracken 2Department of Lands, Fisheries DivisionDublin ICES Marine Science, Volume 29, Issue 3, April 1965, Pages 277–301, https://doi.org/10.1093/icesjms/29.3.277 Published: 01 1965
Journal Article On Selection by the Drifter Fleets in East Anglian Herring Fishery Get access A. C Burd Fisheries LaboratoryLowestoft, England Search for other works this author on: Oxford Academic Google Scholar ICES of Marine Science, Volume 28, Issue 1, June 1963, Pages 91–120, https://doi.org/10.1093/icesjms/28.1.91 Published: 01 1963
"Pi of the Sky" is a detector designed for search optical flashes cosmic origin in sky. Its primary goal to look afterglows associated with gamma ray bursts (GRB), but it capable detect also other transients extragalactic origin. The apparatus consists two arrays 16 cameras each, which allow simultaneous observation whole Due on-line data analysis real time, has self-triggering capability and can react external triggers negative time delay. prototype been installed at Las Campanas (Chile)...
The paper discusses two phenomena called tremor, which result in incorrect operation of the oscilloscope trigger circuits. Both them change delays introduced by circuit, resulting horizontal shifts traces on screen, but origins are different. kinds tremors circuits produce images often similar to those from noise jitter. Hence, limited knowledge tremor may be a source improper interpretation measurements. On other hand can considered as different approach problem flip-flop circuit's metastability.
"XLIII.—A new host for the copepod Anthosoma crassum (Abildgaard), 1794." Annals and Magazine of Natural History, 5(52), pp. 391–392
Modem research trends require observation of fainter and astronomical objects on large areas the sky. This implies usage systems with high temporal optical resolution computer based data acquisition processing. Therefore Charge Coupled Devices became so popular. They offer quick picture conversion much better quality than film technologies. work is theoretical practical study CCD system. The system was optimized for "Pi Sky" project. But it can be adapted to another professional researches....
The paper illustrates an essential influence of skin effect on results time-domain reflectometry technique applied to diagnosis DSL transmission line. Skin (frequency-dependent ohmic losses dependent geometry and material the wire) appeared be a phenomenon mainly responsible for degradation. significantly reduces possibilities wide-band digital data along telephone lines. It also limits TDR measurement system resolution accuracy, which is shown in numerous computer simulation results.
The paper presents a construction of digitally controlled, low cost, time domain relectometry unit designated for evaluation quality transmission lines. "radar-like" TDR technique allows detecting lines discontinuities, including shorts, open circuits, parasitic bridges etc. Described here was successfully tested proving its usefulness imperfections. does not contain GUI nor the utilities post processing measurement data, as they are left MASTER (controlling) system. Measurement results...
Journal Article An Analysis of the Method Sampling East Anglian Herring Catches Get access A. C. Burd Fisheries LaboratoryLowestoft Search for other works by this author on: Oxford Academic Google Scholar ICES Marine Science, Volume 24, Issue 1, November 1958, Pages 80–94, https://doi.org/10.1093/icesjms/24.1.80 Published: 01 1958
The paper presents results of comparative analysis some basic properties multicavity photoacoustic Helmholtz cells. analysed cells were three-cavity resonators formed from a standard dual-cavity cell with an additional cavity connected by means capillary the sample at other end. Influence change volume as well diameter and length connecting duct on microphone signal vs. frequency was studied. Analysis based computer simulations in which modified transmission line model used. improved...
The paper presents a low-cost trigger circuit for use in sampling oscilloscope with bandwidth order of hundreds MHz. presented dual-step provides relatively high because significant reduction possibility incorrect turning on flip-flop (caused by instability called tremor or - describing the same phenomenon other means its metastability. structure, principle operation and physical realization.
An apparatus is described to search for optical, point-like flashes in the sky at time scale of seconds. Such are expected accompany gamma ray bursts (GRB) observed routinely by satellites and proven be extragalactic origin. So far only one such flash has been recorded shortly after GRB, because standard methods observational astronomy not suitable In this paper, a novel approach proposed based on experience from particle physics experiments. which monitors continuously. The large data...
This paper presents a new method of measurement quality factor inductors and resonance circuits with usage the effect formation oscillations in sine wave oscillator. The article two different hardware realizations for parallel series LC resonators.
The main topic is the electronic system, designed and built to help car drivers during parking. It uses electromagnetism phenomena for making an estimation of arrangement obstacles. device works with close distance (about 5-15cm), depending on material from which obstacle made.