Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2809-2815 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogen nuclear magnetic resonance (NMR) was used to probe defect reactions in fused silica during 193 nm ultraviolet irradiation and thermal treatment. Hydrogen concentration and Carr–Purcell measurements indicate that the majority of hydrogen atoms are isolated and do not segregate or evolve from the fused silica during annealing or irradiation. Previously, NMR spin-lattice relaxation measurements have revealed that a small fraction of hydrogen in fused silica exists as centers that undergo molecular motion and are consumed during annealing. Here, a detailed analysis of the NMR spin-lattice relaxation behavior is used to support the identification of this center as a pair of adjacent silanol groups. These silanol pairs react during annealing to form a strained bond, thus increasing the susceptibility of fused silica to E' formation. Excimer laser irradiation, like thermal treatment, is shown to directly reduce the number of relaxation centers in the material. The measured dependence of spin-lattice relaxation as a function of irradiation for identically prepared samples is consistent with silanol pair center consumption by a two-photon process.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1072-1074 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A reaction, based on tungsten hexafluoride chemically reduced by silicon hydride vapors, has been developed for low-temperature laser deposition of high-purity tungsten. Compared to previous tungsten deposition methods, the new (pyrolytic) process requires very little thermal energy for initiation and propagation of the scanned reaction. WF6 and SiH4 (or Si2H6) mixtures have been optimized to yield tungsten interconnect lines with abrupt square cross section and conductivities of 12–25 μΩ cm. Impurity levels are below the detection limits of Auger spectroscopy. Lines 3–20 μm in width and 0.1–4 μm in thickness are written at scan speeds of ∼100 μm/s. Argon-ion laser powers (488 nm) are typically 30–60 mW, corresponding to reaction temperatures sufficiently low for direct writing on polyimide dielectrics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1667-1669 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nuclear magnetic resonance (NMR) was used to study hydrogen in fused silica for the first time. The 1H NMR spin-lattice relaxation time constant (T1) in synthetic fused silica was found to be strongly affected by thermal treatments, correlating with the concentration of E' centers produced during subsequent 193-nm excimer-laser irradiation. In addition, the relative proportion of the two components in the NMR spectrum were affected by thermal treatment, although no change in the total hydrogen content was observed. The broad NMR component, because of its linewidth and dependence upon thermal processing, is postulated to be a direct signature of the NMR relaxation centers. These results are interpreted within the framework of a model in which pairs of silanol groups are consumed during thermal treatment, forming a strained bond which is susceptible to E' center formation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1790-1792 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous WO3 thin films have been deposited in a plasma-enhanced chemical vapor deposition system, and were patterned with a 193-nm excimer laser (one pulse, 10–25 mJ/cm2). Negative-tone, sub-0.5-μm lines and spaces were obtained following dry development in a low-power CF4 plasma. The mechanism for laser-induced etch selectivity was studied with angle-resolved x-ray photoelectron spectroscopy. It was inferred from the fluorine photoelectron spectra that the laser induces atomic rearrangements that impede the etch process initiated by fluorine-containing radicals. A possible interpretation is that the rearrangements, which may be partially thermally activated, reduce the volume of the microvoids present in WO3.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1766-1768 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystalline silicon aggregates imbedded in a predominantly amorphous silicon layer have been observed in anodically etched p-Si(100) by using valence band x-ray photoelectron spectroscopy and lattice imaged high-resolution transmission electron microscopy (XTEM). XTEM has identified the as-prepared porous silicon to be a mixed phase of amorphous and nanocrystalline silicon, with the nanocrystalline aggregates being randomly dispersed throughout the full thickness of a 1 μm thick amorphous layer and exhibiting a size distribution from 2 to 5 nm in diameter. The abundance of the nanocrystalline aggregates seems to decrease as the anodic etching proceeds and as the sample is irradiated by x rays at room temperature in ultrahigh vacuum. Valence band photoelectron measurements show evidence for a crystalline-to-amorphous phase transition induced by x radiation which may, in part, be activated by photoelectron stimulated hydrogen desorption. The x-ray irradiated samples also exhibit a significant reduction in photoluminescence yield, possibly caused by a reduction in the density of nanocrystallites. The observed mixed phase porous silicon and the metastability of the nanocrystallites help to explain apparent contradictory descriptions of the nature of porous silicon. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2937-2939 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using standard microelectronic techniques, we have fabricated arrays of infrared metallodielectric photonic crystals (IR MDPCs) on silicon substrates. The metallic "atoms" are located on a three-dimensional (100)-oriented face-centered-cubic lattice. Resonant stop-band characteristics have been measured with rejection levels of up to 20 dB and widths of up to 83% of the center frequency. We demonstrate structures with stop bands across the midinfrared wavelength range from 2 to 12 μm. Angular studies of the photonic stop bands show an insensitivity to incident angle for some of the structures. The IR MDPC results are compared with measurements made on microwave-scale MDPC structures to help in understanding the infrared results. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 110 (1997), S. 88-91 
    ISSN: 1437-1596
    Keywords: Key words Penile balls ; Penology ; Yakuza ; Self-mutilation ; Sexual medicine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Notes: Abstract The subcutaneous self-implantation of spherical objects in the penis is a well-known practice among members of the Yakuza in Japan but this phenomenon has not previously been described in the Western world. However, recently there were two cases in Berlin of young Eastern European men in whom implanted penile balls as in the Yakuza were found at autopsy. Investigations in Russia revealed that this phenomenon is typically encountered there among prisoners and in certain army units. In addition to the feeling of belonging to a specific group, increased sexual confidence is one major reason for these implantations that are usually performed under primitive conditions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Rechtsmedizin 8 (1998), S. 77-82 
    ISSN: 1434-5196
    Keywords: Key words Blank guns ; Blank cartridges ; Gun shot ; wounds ; Self-made guns ; Weapons law ; Schlüsselwörter Schreckschußwaffen ; Kartuschenmunition ; Schußverletzungen ; Selbstgebaute ; Schußgeräte ; Waffenrecht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Erwerbsscheinfreie Schreckschußwaffen werden gelegentlich umgebaut, um Projektile aus ihnen verschießen zu können. Teilweise wird hierfür auch die entsprechende Kartuschenmunition durch Einarbeiten eines Projektiles in Patronenmunition umgewandelt. Es lassen sich so je nach Modifikationsart Schußgeräte herstellen, die hinsichtlich ihres Leistungsbildes mit „echten“ Schußwaffen vergleichbar sind. Es werden Todesfälle durch Einwirkungen mit unterschiedlich manipulierten Schreckschußwaffen und -munition vorgestellt. Darstellung der Befunde sowie der Waffen. Es wird kurz auf die rechtliche Problematik des Umbaus von Schreckschußwaffen eingegangen.
    Notes: Abstract Blank guns are frequently modified to fire projectiles. For this reason also blank cartridges are altered by adding self-made projectiles. Depending on the modification self-made guns are comparable with “real” guns concerning the technical effects and wound ballistic data. We report about fatalities due to manipulated blank guns and blank cartridges. The autopsy findings as well as the weapons are described. A short overview of the German weapons law concerning altered weapons is given.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Rechtsmedizin 8 (1998), S. 94-97 
    ISSN: 1434-5196
    Keywords: Key words Blank cartridges ; Propellant ; Primer ; Priming composition ; Starter pistols ; Schlüsselwörter Kartuschenmunition ; Platzpatronen ; Treibmittelanalyse ; Zündmittelanalyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Knallkartuschen („Platzpatronen”), die zum Verschießen aus Schreckschußwaffen (§ 22 WaffG) bestimmt sind, wurden hinsichtlich ihres Aufbaues sowie des Treib- und Zündmittels untersucht. Zur Untersuchung gelangte Kartuschenmunition sämtlicher für Kurzwaffen erhältlicher Kaliber. Der Aufbau der Hülsen sowie der Zündelemente entsprachen im wesentlichem dem von Patronenmunition. Die Analysen der Treibladungspulver (TLP) erfolgten mittels HPLC, die der Zündsätze durch Röntgenfluoreszenz und Röntgendiffraktion: Bei Knallkartuschen fand sich als Treibmittel überwiegend einbasiges Treibladungspulver (Nitrocellulose-TLP), vereinzelt aber auch Schwarzpulver. In den größeren Kalibern fanden sich zweibasige Treibladungspulver (Nitroglycerin-TLP) mit Zusätzen von DNT und Dibutylphtalat (DBP). Die einbasigen TLP zeigten sich mit Diphenylamin (DPA), die mehrbasigen TLP mit Centralit I (C I) stabilisiert. Die Zündsätze enthielten als Sprengstoffe fast ausschließlich Bleitrizinat und/oder Hexogen, als Sauerstofflieferanten Bariumnitrate. Eine Besonderheit der Knallkartuschenmunition ist das Vorhandensein eines scheibenförmigen Zwischenmittels, das das Treibmittel zusammenhält und gegen den Hülsenboden drückt. Aufgrund des geringen Gewichtes kommt den Zwischenmitteln keine wesentliche kinetische Energie zu.
    Notes: Abstract We examined the composition of blank cartridges for all available calibers used for starter pistols in Germany including 6 mm, .22 long, 315, 8 × 20 mm, 9 × 17 mm, 9 mm P.A., .35, and .45 short. The cartridge cases and the primer compositions were found to be similar to those of live ammunition. Analyses of the propellants and the priming compositions were performed using HPLC (propellants) and x-ray diffraction/fluorescence (primer). Nitrocellulose was found to be the main propellant of blank cartridges (mono-basic powder) but black powder is also still in use. In the larger calibres we found double base powder (nitroglycerine-powder) with DNT and dibutylphtalate (DBP) as additives. The mono-basic powder was stabilised with diphenylamine (DPA), and the double base powder with centralit I (CI). The primers consisted of lead styphnate and/or hexogen and barium nitrates were typical oxygen donators. A characteristic of blank cartridges is the presence of small discs made of cork or paper which are positioned on top of the propellant to keep it near the bottom of the cartridge case (near the primer). Because of the small mass of these discs the amount of kinetic energy imported is negligible.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 106 (1994), S. 274-276 
    ISSN: 1437-1596
    Keywords: Gas weapons ; Starter pistols ; Air embolism ; Gaswaffen ; Schreckschußwaffen ; Luftembolie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Es wird über einen Suizid mit einer Gaspistole berichtet, die mit 8-mm-Platzpatronen geladen war. Der 58-jährige Mann hatte sich zunächst in die Schläfe und anschließend in den Nacken geschossen. Hierbei waren tiefreichende, beschmauchte Wundhöhlen entstanden. Die Weichteile waren alleine durch die explodierenden Gase geschädigt worden. Todesursache war eine Luft/Gasembolie.
    Notes: Summary Case report on a suicide with a gas pistol loaded with 8 mm blank cartridges. A 58-year-old male shot himself in the right temple and then in the back of the neck. The contact shot wounds showed large wound cavities with interspersed powder particles. The soft tissues were injured solely by the pressure of the exploding powder. Death was due to an air/gas embolism in the right ventricle of the heart.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...