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Early detectors for the EUV

This type of counter signals when a highly energetic X- or gamma ray is detected, but gives no information about its energy. To measure energy, the counter needs to be operated at a somewhat lower voltage and possibly a different gas pressure. When these two parameters are adjusted correctly, the number of electrons created during subsequent ionisations after the initial collision of the gamma ray is proportional to the energy of the incoming gamma or X-ray photon. Hence the name proportional counter. A schematic diagram of such a proportional counter is shown in figure 1.5. Fig. 1.5. Schematic diagram of a proportional counter (from Zombeck 1990). Fig. 1.5. Schematic diagram of a proportional counter (from Zombeck 1990).

Gravitational Wave Detectors

Schematic diagram of an interferometric gravitational wave detector. The beam splitter is coated to allow half the light to be transmitted to one of the mirrors, and the other to be reflected to the other mirror. Real interferometric gravitational wave detectors are much more sophisticated, including frequency stabilization of the laser, a second mirror on each arm between the beam splitter and the end mirror to create Fabry-Perot cavities, and control feedback loops which lock the interferometer onto an interference fringe. Thus, rather than measuring the current from the photo-diode directly, the gravitational wave signals are encoded in the feedback loop voltages needed to maintain the lock of the interferometer. These and many other enhancements are necessary to reach the required sensitivity level.

Combinations of Ducted Jet Engines and Rocket Engines

Rocket Engine Fuel Tank

Simplified schematic diagram of a typical hybrid rocket engine. The relative positions of the oxidizer tank, high pressure gas tank, and the fuel chamber with its nozzle depend on the particular vehicle design. FIGURE 1-6. Simplified schematic diagram of a typical hybrid rocket engine. The relative positions of the oxidizer tank, high pressure gas tank, and the fuel chamber with its nozzle depend on the particular vehicle design.

Solar magnetism and Earths climate

A schematic diagram showing how the magnetic field on the day-side is compressed by the solar wind whereas the night-side field is dragged out into a tail shape. Figure 7.1. A schematic diagram showing how the magnetic field on the day-side is compressed by the solar wind whereas the night-side field is dragged out into a tail shape.

Sample Problem 3 Angular Momentum and Energy from Shell Velocity

Figure 10 Schematic diagram of the initial conditions, showing the difference between azimuth < > and angle of launch 0O shen measured in shell coordinates Figure 10 Schematic diagram of the initial conditions, showing the difference between azimuth < > and angle of launch 0O shen measured in shell coordinates

Experimental Setup And Results

Schematic diagram of the experiment. The dust (dotted arrow) falls from a dropper at the top of the vacuum chamber then falls past a photoemitting surface. The charge on the dust is measured by a Faraday cup below the chamber. The photoemitter and the anode grid may be removed to determine the photoelectric charging of isolated grains. FIGURE 1. Schematic diagram of the experiment. The dust (dotted arrow) falls from a dropper at the top of the vacuum chamber then falls past a photoemitting surface. The charge on the dust is measured by a Faraday cup below the chamber. The photoemitter and the anode grid may be removed to determine the photoelectric charging of isolated grains.

Experimental Setup And Procedure

Figure 1 shows the schematic diagram of the experimental setup. We used the commercial ECR plasma etch tool for polysilicon gate etch using CI2 and O2. The quartz internal bell jar surface is frosted (Ra l 10 xm). The hight of reactor chamber is 500mm and its diameter is 440mm. The process gases are introduced through the gas distribution ring around the waferstage and evacuated by a turbo-molecular pump through the square cross section exaust port of 440mmx 120mm and to the side of the wafer stage. 200mm diameter wafers are introduced into the chamber through a separately pumped load lock and set onto the wafer stage. So, particles from an environment of cleanroom could not affect the measurement. Radiofrequency power (13.56MHz) was applied to the wafer.

Experimental Procedure

A straight transmission type TOF apparatus with a retarding potential method was used in the TCS experiments for positrons and electrons colliding with various polyatomic molecules. The flight path length is about 600mm. A schematic diagram of the experimental setup is shown in Fig. 1. The retarding potential set was located in front of the detector to eliminate large energy inelastic scattering events, and large angle elastically and small energy inelasti-cally scattered such as rotational and vibrational excitations, particles 5 . Of course, the latter event depends upon impact energy. Figure 1. Schematic diagram of the main part of the experimental setup and electronic circuits. The abbreviated symbols are as follows E E , E0 and C.F. Discrim. are the retarding energy, acceleration energy, constant energy (Eo E. - Er), constant fraction discriminator, respectively. Figure 1. Schematic diagram of the main part of the experimental setup and electronic circuits. The abbreviated...

Concave Grating Mountings

The Rowland mounting was probably the first type of grating spectrometer used for astronomical spectroscopy. A schematic diagram of a Rowland mounting is shown in Fig. 14.4. Although it was adequate for recording solar spectra, it was a failure in stellar spectroscopy, primarily because of its astigmatism. As an example of the size of the astigmatism, we take X 500 nm for a first-order grating with 600 grooves mm and a diameter of 100 mm. From the relation in Table 14.2 we get TAS y 0.090 for a 0 and TAS v 0.045 for a (i, hence image lengths are 9 and 4.5 mm, respectively, for a point source at the entrance slit.

Experimental Apparatus

A schematic diagram of the experimental apparatus is shown in Fig. 1. A dc argon discharge plasma is produced at 220 mTorr by applying negative dc potential of about 270 320 V to an upper cathode electrode with respect to a middle grounded mesh anode. The plasma diffuses downward through the mesh anode. Typical electron density and electron temperature of the diffused plasma are 1 x 108 cm3 and 1 eV, respectively. At 2.0 cm below the mesh anode, a segmented particle levitation electrode (SPLE) is set up, consisting of three electrodes. The electrode at center of the SPLE is a disc of 0.5 cm in diameter, and the two ring electrodes are set up around it. The one is the ring electrode with inner and outer diameters of 0.5 cm and 1.5 cm, respectively, and the other is with 1.5 cm and 19 cm, respectively. Different dc potentials Vc, Vr , and Vr2 can be applied to the three electrodes independently in order to control potential profile in the particle levitation region. The particles used...

Experimental Apparatus And Methods

A schematic diagram of the experimental apparatus is shown in Fig.l. In cylindrical vacuum chamber, two parallel electrodes of 90mm in diameter were placed at a separation of 30mm. DC power supply was used for a generation of glow discharges and the typical experimental condition is as follows Ar gas pressure, gas flow rate and discharge voltage were P 0.1'2 Torr, F.R 10sccm a.nd V 500V, respectively. A homogeneous magnetic field of 0-50 Gauss in the axial direction of the cylindrical chamber was generated by two solenoid coils mounted outside the vacuum chamber.

The search of the Globular Cluster system

Schematic diagram of the Galactic Coordinate system viewed from above, showing the distribution of the new discovered pulsars overlaid on the previous known sample Figure 3. Schematic diagram of the Galactic Coordinate system viewed from above, showing the distribution of the new discovered pulsars overlaid on the previous known sample

Al Coordinated Universal Time

In addition to the general-purpose shortwave receiver, there are a couple of special-purpose alternatives. If you search the used-equipment markets or websites, you may find special-made WWV receivers (e.g., the Radio Shack TimeCube) that are permanently tuned to WWV. There are also retail manufacturers of atomic time clocks''. These are quartz clocks with built-in WWV radio receivers that keep them synchronized to WWV. If you're an electronics technician, there have also been designs published that enable you to make your own portable WWV receiver.

The expansion of HII regions

Figure 12.1 A schematic diagram of the structure of an ionization front (IF). A flux of ionizing photons, X, shines upon neutral gas with density and pressure p0 and P0. The ionized gas density and pressure are p1 and P1. The velocities are in the frame of the ionization front. Figure 12.1 A schematic diagram of the structure of an ionization front (IF). A flux of ionizing photons, X, shines upon neutral gas with density and pressure p0 and P0. The ionized gas density and pressure are p1 and P1. The velocities are in the frame of the ionization front.

Turbopump Feed Systems And Engine Cycles

Flight Arc

Figure 6-9 shows the three most common cycles in schematic form. Reference 6-13 shows variations of these cycles and also other cycles. The gas generator cycle and the staged combustion cycle can use most of the common liquid propellants. The expander cycle works best with vaporized cryogenic hydrogen as the coolant for the thrust chamber, because it is an excellent heat absorber and does not decompose. The schematic diagrams of Fig. 6-9 show each cycle with a separate turbopump for fuel and for oxidier. However, an arrangement with the fuel and oxdizer pump driven by the same turbine is also feasible and sometimes reduces the hardware mass, volume, and cost. The best cycle has to be selected on the basis of the mission, the suitability of existing engines, and the criteria established for the particular vehicle. There is an optimum chamber pressure and an optimum mixture ratio for each application, engine cycle, or optimization criterion, such as maximum range, lowest cost, or...

Annihilation On Atoms And Molecules

Schematic diagram of the apparatus used to study positron annihilation. The positrons are confined in a Penning trap by potentials applied to the electrodes and a magnetic field, B. Annihilation rates are measured by storing the positrons for various times in the presence of a test gas, then measuring the number of positrons remaining by dumping them on a plate and measuring the gamma ray signal. The Doppler linewidth of the gamma rays is measured using a Ge detector placed in close proximity to the trapped positrons. Figure 1. Schematic diagram of the apparatus used to study positron annihilation. The positrons are confined in a Penning trap by potentials applied to the electrodes and a magnetic field, B. Annihilation rates are measured by storing the positrons for various times in the presence of a test gas, then measuring the number of positrons remaining by dumping them on a plate and measuring the gamma ray signal. The Doppler linewidth of the gamma rays is measured...

The Rosat Wide Field Camera

The WFC was designed to cover the EUV range during the ROSAT mission, principally from 60 to 200 A during the survey itself, but with a capability of observing at longer wavelengths, to 600 A, during the pointed phase of the mission. The instrument consisted of a grazing incidence telescope comprising a set of three Wolter-Schwarzchild Type I gold-coated aluminium mirrors (Willingale 1988), with a MCP detector in the focal plane (Barstow et al. 1985 Fraser et al. 1988 Barstow and Sansom 1990). A focal plane turret mechanism allowed selection between two identical detector assemblies. An aperture wheel mounted in front of the focal plane contained eight thin film filters to define the wavelength pass bands, suppress geocoronal background (which would otherwise saturate the detector count rate), and prevent UV radiation from hot O and B stars from being imaged indistinguishably from the EUV. A baffle assembly mounted in front of the mirrors excluded scattered solar radiation from the...

Positron Accumulation And Lifetime

Schematic diagram of the experimental Penning trap and the on-axis potential well and electric fields used for trapping positrons. This was one of the smaller well depths used to accumulate positrons. Figure 6. Schematic diagram of the experimental Penning trap and the on-axis potential well and electric fields used for trapping positrons. This was one of the smaller well depths used to accumulate positrons.

Conditions For 5000n Thrust

Thrust Stage Diagram

Simplified schematic diagram of two propulsion systems for one type of maneuverable upper stage of an interceptor missile. The side or divert forces are relatively large and go essentially through the center of gravity (CG) of the upper stage vehicle. To minimize the CG travel two grains are above and two grains are below the CG. Each nozzle has its own hot gas valve, which is normally open and can be pulsed. The attitude control system (ACS) is fed from the reaction gas of two grains and has six small nozzles. FIGURE 11-28. Simplified schematic diagram of two propulsion systems for one type of maneuverable upper stage of an interceptor missile. The side or divert forces are relatively large and go essentially through the center of gravity (CG) of the upper stage vehicle. To minimize the CG travel two grains are above and two grains are below the CG. Each nozzle has its own hot gas valve, which is normally open and can be pulsed. The attitude control system (ACS) is fed...

Flux Ropes Observed in Interplanetary Space

A schematic diagram of flux rope. Source. Webb, D.F., R.P. Lepping, L.F. Burlaga, S.E. DeForrest, D.E. Larson, S.F. Martin, S.P. Plunkett, and D.M. Rust, J. Geophys. Res., 105, 27251, 2000 Figure 8.11. A schematic diagram of flux rope. Source. Webb, D.F., R.P. Lepping, L.F. Burlaga, S.E. DeForrest, D.E. Larson, S.F. Martin, S.P. Plunkett, and D.M. Rust, J. Geophys. Res., 105, 27251, 2000

Advanced XRay Astronomy Facility AXAFChandra

A schematic diagram of the Chandra AXAF spacecraft. The Chandra spacecraft is typical in providing a support structure for the imaging equipment on board (optical bench), a power generation system (solar array), and a way to protect the sensitive equipment from solar radiation (sunshade door). Energetic X-ray photons strike a nested set of mirrors at small angles so that they are reflected into the focal plane. Courtesy of the Chandra Science Center. Figure 2.10. A schematic diagram of the Chandra AXAF spacecraft. The Chandra spacecraft is typical in providing a support structure for the imaging equipment on board (optical bench), a power generation system (solar array), and a way to protect the sensitive equipment from solar radiation (sunshade door). Energetic X-ray photons strike a nested set of mirrors at small angles so that they are reflected into the focal plane. Courtesy of the Chandra Science Center.

Review of spectrographs

Diagram Spectrometer Telescope

Schematic diagram of a typical astronomical spectrograph. The major components are the CCD detector, the continuum and comparison line calibration sources, the TV slit viewer, and the grating. From Wagner (1992). Fig. 6.1. Schematic diagram of a typical astronomical spectrograph. The major components are the CCD detector, the continuum and comparison line calibration sources, the TV slit viewer, and the grating. From Wagner (1992). Fig. 6.2. Schematic diagram of a cross-dispersed echelle spectrograph showing the echelle grating and the cross disperser. The final 2-D spectral image is projected on to a CCD.

Aspects of the Atmospheric Water Cycle

Fig. 8.4 Schematic diagram showing the different reservoirs of exchangeable water in the atmosphere and shallow subsurface as well as the fluxes between them. The magnitudes of the fluxes are not shown because of large uncertainties. Fig. 8.4 Schematic diagram showing the different reservoirs of exchangeable water in the atmosphere and shallow subsurface as well as the fluxes between them. The magnitudes of the fluxes are not shown because of large uncertainties.

A fascination with anything aeronautical

William Thornton

By eleventh grade, Thornton had opened and began operating a radio electronics repair shop that would help finance his university education. In his last year of high school, and throughout college, he was supported entirely by weekend and vacation work in electronics. This included the design, installation and maintenance of entertainment, industrial and communication electronic systems. He later stated in his application to NASA that ''informal study during this period has proved to be more than equivalent to a degree in electronic engineering.''

Extreme Environments and Their Inhabitants 931 Extremophiles and Extremotolerants

Schematic diagram showing the tree of life based on 16S 18S rRNA sequences. Each line represents a sequence (in turn representing the corresponding organism) each triangle represents a group of closely related sequences. Blue triangles correspond to environmental lineages for which no cultivated members are known

Ccd Testing And Characterization At Fermilab

The electronics chosen for the readout of the focal plane devices in DES will be based on the Monsoon standard 6 . These readout electronics will also be used for CCD testing and characterization. DES is currently adapting the Monsoon readout system to accommodate LBNL devices. The electronics engineering group at DES is designing a 12-channel acquisition board for Monsoon that is required for the number of channels in the DES focal plane.

Figures

4.2 A schematic diagram showing the structure of a large sunspot with umbra and penumbra (a). Close-up photograph of sunspots showing the umbral and penumbral regions (b) 46 4.14 A schematic diagram showing solar rotation from east to west 72 5.12 A schematic diagram showing the basic features of the Hadley cell 127 7.1 A schematic diagram showing how the magnetic field on the day-side is compressed by the solar wind whereas the night-side field is dragged out into 7.2 Schematic diagrams illustrating the different effects that low and high clouds have on the surface 182

Positron Detection

In the experiment, the presence of trapped positrons was verified by three different methods. The positrons were detected by our a) observing changes in the 9Be+ ion fluorescence due to application of the microwaves near the positron cyclotron frequency, b) detecting the absence of ions in the plasma center in side-view images of the ion fluorescence, and c) detecting the annihilation radiation after pulsing the accumulated positrons onto the titanium foil (same foil that is at the top of the vacuum envelope). Figure 2 is a schematic diagram of the different detection techniques. Figure 2. Schematic diagram of the experimental Penning trap and the three techniques used for detecting positrons e+ cyclotron excitation with a 166 GHz source, e+-9Be+ side-view images using f 5 optics and a camera, and a Nal scintillator with a photomultiplier tube. Figure 2. Schematic diagram of the experimental Penning trap and the three techniques used for detecting positrons e+ cyclotron excitation...

Energy

Figure 2.54 Schematic diagram of the main processes that are responsible for gamma ray production in the atmosphere. Shown is the typical electromagnetic cascade process as it takes place in the atmosphere. It is initiated predominantly by the decay products of secondary particles resulting from hadronic interactions caused by energetic primary hadrons in collisions with nuclei of the atmospheric constituents. The neutrinos that are being produced in various decays but which do not contribute to the growth of the cascade process are also indicated for completeness. Primary gamma rays and electrons make only minor contributions to the gamma ray flux in the atmosphere. The typical energy scale indicated on the right hand side of the figure shows the energy domain where the processes illustrated on the left are dominant in contributing to the gamma flux. The lateral spread of the cascade as shown in this figure is grossly exaggerated for reasons of illustration. Figure 2.54 Schematic...

Results

Figure 2 shows a schematic diagram of the genesis of powder formation. The evolution of the size of the particles, related to the time elapsed from the beginning of the discharge, is very fast. Detailed studies have shown that the time scale is in the range of seconds to minutes and that the increase in size is accompanied by a drastic decrease of the particle density, from 1011 cm-3 at the beginning down to 108 cm'3 after agglomeration 3 27 . A general review on particle formation, from monomers to macroscopic particles, has been given by J. Petrin and Ch. Hollenstein in the chapter II of the book dusty plasmas (Wiley & Sons, 1999).

Fuel cells

The hydrogen oxygen fuel cell has been used for space applications, a product of the reaction being water. This is clearly useful for manned missions. A schematic diagram of such a cell is shown in figure 10.10. This technology has also been proposed for lunar rover missions 9 .

Beyond the Big Bang

Figure 8.3. (a) A schematic diagram of the universe at the era of decoupling. The dashed lines denote the size of the horizon at that time. The region of the elastic (universe) bounded by the lines A and B corresponds to that part of the universe that is contained within our current horizon. In this diagram, the horizon size at decoupling is smaller than the distance between A and B. These two regions would not have been able to communicate with each other, and there is no reason to suppose that they should have the same temperature. (b) If the horizon size is greater than the distance between the two regions, this is not a problem.

Turbopumps

This turbopump feed system and its several cycles have been discussed in Section 6.6 and Fig. 6-2 categorizes the various common turbopump configurations. Turbopumps or installation of turbopumps in rocket engines are shown in Figs. 1-4, 6-1, 6-12, 8-19, 10-1, 10-2, 10-3, and 10-11 they are discussed in Refs. 6-1 and 10-1. A schematic diagram of different design arrangements of pumps and turbines for common turbopump types can be seen in Fig. 10-4. Table 10-1 shows lists parameters of pumps and turbines of two large rocket engines.

Carlina

Fig. 8.18 Schematic diagram of the CARLINA instrument. The gondola beneath the captive balloon carries the recombiner. The position of the whole assembly is controlled by cables Fig. 8.18 Schematic diagram of the CARLINA instrument. The gondola beneath the captive balloon carries the recombiner. The position of the whole assembly is controlled by cables

Bratton

Bratton (1923- ), who has been a mentor and inspiration for amateur astronomers and telescope makers in the Memphis, Tennessee, area since the late 1960s. An electronics technician by profession, he became a highly skilled optical craftsman, constructing or advising in the construction of many telescopes. His designs often involved remarkable resourcefulness and ingenuity, such as using borosilicate glass cut from old color television picture-tube faceplates as f 2 Schmidt camera primary mirror blanks. (M 33787) Name suggested and citation by R. Tucker.

Gibbous

Rotation, revolution, and phases of the moon are explained In this schematic diagram of the moon's orbit around the earth. The Illuminating sun Is located far to the right, and the moon's positions et intervals of three and two-thirds days are shown. The illumination of the moon as we see it in the Northern Hemisphere at each numbered position is shown at the bottom of the diagram. For the Southern Hemisphere invert the drawing. The directions of orbital revolution and axial rotation for both bodies are Indicated by small arrows. The protrusion on the earthward side of the moon represents the large crater Ptolemy which is always near the center of the lunar disk we see. If you begin at 1 and glance quickly around the orbit, centering your attention on Ptolemy at each position, you will see the moon rotate on its axis In a period equal to that of its revolution.

Twomirror Telescopes

We introduced the topic of two-mirror telescopes in Chapter 2 with schematic diagrams of two types, Cassegrain and Gregorian, in Fig. 2.7, as well as a set of definitions of normalized parameters with which to describe any two-mirror telescope. Selected items from Section 2.5 and Table 2.1 are summarized in Table 6.3 for convenient reference.

Global Structure

Electromagnetic Supersonic

The detection of anomalous cosmic ray fluxes by Garcia-Munoz et al. (1973), Hovestadt et al. (1973), and McDonald et al. (1974) led to the construction of a remarkable chain linking interstellar neutral atoms, interstellar pickup ions (their prediction and eventual detection 10 (He) and 20 (H) years later Fisk et al., 1974 Mobius et al., 1985 and Gloeckler et al., 1993), anomalous cosmic rays (ACRs) experiencing diffusive shock acceleration at a postulated termination shock (Pesses et al., 1981 Jokipii, 1986), and energetic neutral atoms created by charge exchange between ACRs and interstellar neutrals (Hsieh et al., 1992a,b). Figure 2.1 is a schematic diagram of the chain. That the various elements are linked is now well established however, the precise details underlying the coupling are still not properly understood, and models remain incomplete. The coupling of the different elements within the chain reveals the interplay of large-scale heliospheric structure and detailed...

Velocimetry

Fig. 8.1 Schematic diagram of a spectrograph for measuring radial velocities (see the main text for a description of the principles involved) Fig. 8.1 Schematic diagram of a spectrograph for measuring radial velocities (see the main text for a description of the principles involved) Fig. 8.2 A schematic diagrams of the optics of the ELODIE spectrograph. The spectral dispersion is produced by the diffraction grating, while the orders are superimposed on the CCD by a grism (grating-prism) giving cross dispersion (After Baranne et al., 1996) Fig. 8.2 A schematic diagrams of the optics of the ELODIE spectrograph. The spectral dispersion is produced by the diffraction grating, while the orders are superimposed on the CCD by a grism (grating-prism) giving cross dispersion (After Baranne et al., 1996) To obtain such high spectral resolutions, the spectrograph consists of a diffraction grating and a crossed-dispersion system which allows the various orders from the grating to be superimposed...

Low and high clouds

A simple model based on energy balance considerations and a given atmospheric lapse rate (rate of change of temperature with height r dT dz) is derived below. The equations are based on radiative energy balance from the schematic diagrams for low and high clouds shown in Figure 7.2. Figure 7.2. Schematic diagrams illustrating the different effects that low and high clouds have on the surface temperature. Figure 7.2. Schematic diagrams illustrating the different effects that low and high clouds have on the surface temperature.

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