tdrs and optical tdrs otdrs
Stimulated Emission and Optical Gain in Semiconductors
Ngày tải lên :
23/10/2013, 20:15
... orbital and consists of a heavy-hole band, a light-hole band and a split-off band [3] The upper edge of the valence band is at the À point, the center of k space, where the heavy-hole and light-hole ... etc.) and II–VI compound semiconductors have a band structure similar to that of Fig 3.1 and the direct-transition bandgap On the other hand, for group IV semiconductors such as Si and Ge, and ... parabolic band Here, Ec and Ev are energies of the lower edge of the conduction band and the upper edge of the valence band, respectively, the difference Eg ¼ Ec À Ev is the bandgap energy, and mn...
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iec 60332-2_2 tests on electric and optical fibre cables under fire condition
Ngày tải lên :
25/12/2013, 10:58
... report on ONE STANDARD and ONE STANDARD ONLY Enter the exact number of the standard: (e.g 60601-1-1) Q6 standard is out of date standard is incomplete standard is too academic standard is too superficial ... concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical ... This first edition of International Standard IEC 60332-2-2, together with IEC 60332-2-1, cancel and replace the third edition of IEC 60332-2, published in 1989, and constitute a technical revision,...
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iec 60332-1_1 tests on electric and optical fibre cables under fire condition
Ngày tải lên :
25/12/2013, 10:59
... report on ONE STANDARD and ONE STANDARD ONLY Enter the exact number of the standard: (e.g 60601-1-1) Q6 standard is out of date standard is incomplete standard is too academic standard is too superficial ... confirmatory test arrangement and guidance IEC Guide 104, The preparation of safety publications and the use of basic safety publications and group safety publications Terms and definitions For the ... This first edition of International Standard IEC 60332-1-1, together with IEC 60332-1-2, cancel and replace the third edition of IEC 60332-1, published in 1993, and constitute a technical revision,...
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iec 60332-1_2 tests on electric and optical fibre cables under fire condition
Ngày tải lên :
25/12/2013, 10:59
... report on ONE STANDARD and ONE STANDARD ONLY Enter the exact number of the standard: (e.g 60601-1-1) Q6 standard is out of date standard is incomplete standard is too academic standard is too superficial ... concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical ... This first edition of International Standard IEC 60332-1-2, together with IEC 60332-1-1, cancel and replace the third edition of IEC 60332-1, published in 1993, and constitute a technical revision,...
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iec 60332-1_3 tests on electric and optical fibre cables under fire condition
Ngày tải lên :
25/12/2013, 10:59
... report on ONE STANDARD and ONE STANDARD ONLY Enter the exact number of the standard: (e.g 60601-1-1) Q6 standard is out of date standard is incomplete standard is too academic standard is too superficial ... safety publications and the use of basic safety publications and group safety publications ISO 187, Paper, board and pulps – Standard atmosphere for conditioning and testing and procedure for monitoring ... edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the base publication incorporating amendment and the base publication incorporating amendments and Informations supplémentaires...
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iec 60332-2_1 tests on electric and optical fibre cables under fire condition
Ngày tải lên :
25/12/2013, 11:00
... report on ONE STANDARD and ONE STANDARD ONLY Enter the exact number of the standard: (e.g 60601-1-1) Q6 standard is out of date standard is incomplete standard is too academic standard is too superficial ... This first edition of International Standard IEC 60332-2-1, together with IEC 60332-2-2, cancel and replace the third edition of IEC 60332-2, published in 1989, and constitute a technical revision, ... concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical...
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Tài liệu New Generation Networks and Optical Network Testbeds doc
Ngày tải lên :
26/01/2014, 02:20
... 100Gbps optical path and QoS service 100Gbps optical path and QoS service provisioning between terabit-class LANs provisioning between terabit-class LANs >100Gbps optical 3R 32 Optical RAM for all -optical ... management for optical path provisioning between terabit-class LANs Optical path ISP network A Terabit-class optical LAN Optical path ISP network B Optical path ISP network C Terabit-class optical LAN ... >10Tb/s λ3 λ2 Optical IP Router WDM Optical Burst Switch WDM Optical MPLS Router OXC Full-mesh NW (Centralized Control) WDM 2010〜 Year Year 〜 OADM : Optical Add/Drop Multiplexer OXC : Optical Cross-connect...
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Effects of simultaneous doping with boron and phosphorous on the structural, electronic and optical properties of silicon nanostructures
Ngày tải lên :
16/03/2014, 15:15
... effects of size and shape of Si-nc on the incorporation of group-III (B and Al), group-IV (C and Ge) and group-V (N and P) impurities Single-doping has been investigated both in spherical and faceted-like ... the Si144BBPH100 (with an excess of B: B atoms and P) or the Si144BPPH100-nc (with an excess of P: B and P) and finally, adding simultaneously two B and two P atoms, we obtain the Si143BBPPH100-nc ... doping influences the electronic and optical properties Here, we aim to resume the main outcome of this work and illustrate specific results only for one single-doped and codoped H-passivated Si-nw...
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synthesis and optical properties of colloidal tungsten oxide nanorods
Ngày tải lên :
20/03/2014, 13:08
... localized states in the band gap due to impurities.22b In light of these assignments, we suggest that the UV emission of nanorod samples in this work might correspond to the band-toband transition The ... and the intensity of this peak increases relative to that of UV emission as the length of nanorods increases A similar PL pattern with two emission maxima, yet at much lower energies of 2.8 and ... 20 nm (medium), and 130 ( 30 nm (long) The strongest PL emission peaks appear at 3.60 eV (344 nm), 3.56 eV (348 nm), 3.55 eV (349 nm) for short (25 ( nm), medium (75 ( 20 nm), and long (130 (...
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Báo cáo " The dependence of the parametric transformation coefficient of acoustic and optical phonons in doped superlattices on concentration of impurities" pot
Ngày tải lên :
22/03/2014, 11:20
... function, and λ = mΩ The parametric transformation coefficient of acoustic and optical phonon in doped superlattices In order to establish the parametric transformation coefficient of acoustic and optical ... ( cq , cq ) is the r creation operator and annihilation operator of an acoustic (optical) phonon for state have wave vector q The electron-acoustic and optical phonon interaction coefficients ... of the parametric transformation coefficient of acoustic and optical phonons in doped superlattices on concentration of impurities Model and quantum kinetic equation for phonons We use model for...
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characterization and optical property of zno nano-,
Ngày tải lên :
06/05/2014, 13:22
... oxygen vacancy and interstitial zinc (VoZni) and valence band, and the peak on 574 nm relates to the transition between complex oxygen vacancy and interstitial zinc (VoZni) and valence band or between ... and microrods are shown in Fig 3b and c The spectra of the ZnO microrods mainly consists of four emission bands: (i) a weak UV emission band centered at 403.50 nm, (ii) two weak blue-green bands ... Then the optical property of the products was studied The photoluminescence spectra indicated a weak emission peak at UV wavelength and a strong green band for submicro- and microrods and a strong...
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fabrication and optical properties of ordered sea urchin-like zno
Ngày tải lên :
06/05/2014, 13:23
... SEM images, TEM image, HRTEM image and SAED pattern of the sea urchin-like ZnO nanostructures are presented in Fig Fig 2a and b displays the low magnification and high magnification SEM images of ... are assembled by a central nucleus and many needlelike ZnO which grow radially from the nucleus The TEM image in Fig X-ray diffraction pattern (a) and UV–visible optical absorption characteristics ... X-ray diffraction system (SIEMENS D5000) UV–visible optical absorption was measured by UV–visible spectrophotometer (Beijing,TU-1901) Results and discussion Fig 1a shows the XRD pattern of the...
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introduction to electromagnetic compatibility (wiley series in microwave and optical engineering)
Ngày tải lên :
01/06/2014, 10:02
... in electric circuit analysis, signals and systems, electronics, and electromagnetic fields The text builds on those basic skills, principles, and concepts and applies them to the design of modern ... in use and importance FORTRAN programs are described here and in Appendix C that compute these parameters very accurately for ribbon cables, PCB land structures, coupled microstrip lines, and coupled ... today’s standards) and required large power consumption and considerable “real estate.” In the 1970s the integrated circuit allowed the construction of computers that consumed far less power and required...
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synthesis and optical properties of au-ag alloy nanoclusters with controlled composition, p26
Ngày tải lên :
04/06/2014, 15:20
... shape of those nanoparticles, optical absorption spectra give a quick and gross idea on their shapes and sizes In this study we used TEM, HREM and HAADF, along with optical absorption spectroscopy ... alcohol [21] On the other hand, Au-Ag bimetallic nanoparticles show different optical responses for alloy and core-shell configurations, even when they have same Au and Ag contents Au-Ag alloy ... control of structural type and composition of bimetallic nanoparticles comprised of Ag and Au have been a subject of considerable interest; and the developed of simple and versatile methods for...
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Báo cáo toán học: " The structural and optical properties of GaSb/InGaAs type- quantum dots grown on InP (100) substrate" ppt
Ngày tải lên :
20/06/2014, 20:20
... 17] The reason is that they offer comparatively large bandgap energies and provide a possibility of covering the whole middle and far-infared optical range for photoelectric devices Among these ... diameter, and height size distribution of GaSb/ InGaAs QDs on InP (100) substrate, the AFM and STEM measurements were carried out Figure shows the AFM and STEM images of GaSb/In0.53Ga0.47As QDs and ... STEM measurement SZ, TH, and GH conducted the MBE growth JH, WW, and CH coordinated the study WL provided the idea and conceived the study together with ZL All authors read and approved the final...
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Báo cáo toán học: " Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering" potx
Ngày tải lên :
20/06/2014, 21:20
... value The optical band gap of the film deposited at 100°C was 3.45 eV As the growth temperature increased from 200°C to 350°C, the optical band gap red-shifted from 3.57 to 3.79 eV The band gaps ... properties and helped draft the manuscript KNH and KSH detailed the original idea and modified the first draft of manuscript YGS finalized the manuscript and supervised the work All authors read and ... Valenzuela and Russer reported that the FWHM of an XRD peak is reliant on the crystallite size and the lattice strain caused by the defect and/ or dislocations [16] The average particle sizes and FWHM...
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Báo cáo hóa học: " Effects of silver impurity on the structural, electrical, and optical properties of ZnO nanowires" doc
Ngày tải lên :
20/06/2014, 22:20
... very sensitive tool for the characterization of acceptor/donor impurities and is helpful in understanding the optical and electrical performances of the materials We focused on the temperature-dependent ... were cleaned in acetone and methanol for 20 and rinsed in de-ionized water for The 1, 3, and wt % SZO (5SZO) NWs are grown in a furnace at 800°C with argon gas of 90 sccm and a working pressure ... (Ag 3d5/2) of the SZO NWs are observed at 369.7 and 369.3 for 3SZO and 5SZO NWs, respectively shown in Figure The 3SZO and 5SZO NWs show Zn, O, and Ag orbital in Figure 4b, c However, in case...
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Báo cáo hóa học: " Synthesis, magnetic and optical properties of core/shell Co1-xZnxFe2O4/SiO2 nanoparticles" pot
Ngày tải lên :
21/06/2014, 01:20
... nanoparticles (Co1-xZnxFe2O4; x = 0, 0.5, and 1) and shelling with silica on the magnetic and optical properties of the ferrite nanoparticles for a variety of magneto -optical nanodevice applications From ... Co0.5Zn0.5Fe2O4/SiO2, and ZnFe2O4/SiO2 particles were separated using external magnet, and washed with ethanol and water several times The samples have been dried at 40°C for 24 h and fired at temperatures ... with silica shell and fired at 400°C show a ferromagnetic behavior and high diffuse reflectance compared with all uncoated and coated nanoparticles due to the presence of zinc ions and the silica...
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