synchrotron radiation induced x ray emission
Báo cáo khoa học: "Use of kilovoltage X-ray volume imaging in patient dose calculation for head-and-neck and partial brain radiation therapy" pptx
Ngày tải lên :
09/08/2014, 08:23
... Descovich M, Xia P, Pouliot J: Dose calculation using megavoltage cone-beam CT Int J Radiat Oncol Biol Phys 2007, 67:1201-10 Ding GX, Duggan DM, Coffey CW: Characteristics of kilovoltage x- ray beams ... computed tomography in radiation therapy Phys Med Biol 2007, 52:1595-615 Siewerdsen JH, Jaffray DA: Cone-beam computed tomography with a flat-panel imager: magnitude and effects of x- ray scatter Med ... this article as: Hu et al., Use of kilovoltage X- ray volume imaging in patient dose calculation for head-and-neck and partial brain radiation therapy Radiation Oncology 2010, 5:29 Page 10 of 10...
- 10
- 393
- 0
Báo cáo sinh học: "Developmental time at which spontaneous, X-ray-induced and EMS-induced recessive lethal mutations become effective in Drosophila melanogaster" potx
Ngày tải lên :
14/08/2014, 20:20
... between X- ray -induced, EMS -induced and natural lethal mutations evidently exist As can be seen from table III, a very high proportion of X- ray -induced lethal mutations are combined with X- rayinduced ... mutations, X- ray induced lethal mutations and EMS -induced lethal mutations has taken advantage of these new technical possibilities The main purpose of the investigations was to compare X- ray -induced, ... lethals A cytological survey was performed for the X- ray- and EMS -induced lethals It is wells known that an acute irradiation with a high X- ray dose over a rather short time induces a high proportion...
- 14
- 138
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 1
Ngày tải lên :
14/09/2015, 08:40
... carbide XRD : x- ray diffraction HR-XRD : High-resolution synchrotron x- ray diffraction RSM : Reciprocal space mapping PLM : Polarized light microscope xx FWHM : Full-width-at-half-maximum ε’ ... analysis -Temperature dependent synchrotron x- ray (-253-177 °C) E-field dependent neutron diffraction -E-field dependent synchrotron x- ray -X- ray and PLM -E-field induced O phase -R→T→C -R→T→C ... et al.) S: x = ([001]-poled) S: x = ([001]- and [111]-poled) S: x = 5, (unpoled) S: x =4.5, ([001]-poled) S: x = 4.5, ([001]-poled) S: x =8, 10 ([100]-,[011]-, and [111]-poled) P: 10 x 15 prepared...
- 76
- 217
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 2
Ngày tải lên :
14/09/2015, 08:40
... surface X- ray 44.65o ~43.0-44.0o 42 43 44 45 46 47 2θ [010]W [100] L PZN-4.5%PT b) b) Fractured surface Intensity (arb units) X- ray X- ray 44.62 42 43 44 45 o 46 47 2θ Figure 5.1 (002) XRD profiles ... depth of µm [16] Synchrotron x- ray diffraction of higher energy, being 18 keV, revealed similar penetration depth in PZN-8%PT sample [32] Meanwhile, using synchrotron x- ray diffraction at 10.7 keV, ... addition, x- ray penetration depth in high lead content materials remains controversial Normal x- ray diffraction with energy 8.048 keV performed on PZN-8%PT sample has a penetration depth of µm [16] Synchrotron...
- 12
- 219
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 3
Ngày tải lên :
14/09/2015, 08:40
... in the x- ray diffraction patterns (Figures 5.11a, c, and e) As a result, the polished surface can hardly reveal any useful structural information of the crystals hence unsuitable for x- ray diffraction ... for x- ray diffraction study 5.3.2 Electrical resistance 73 The effect of room-temperature poling on the stability of the deformed surface layer was also investigated Figure 5.12 shows the XRD ... for the occurrence of the extremely broad lower 2θ peak adjacent to the main (002)R peak in standard XRD profiles of (001)-orientated PZN-PT single crystals has been examined This diffraction arises...
- 7
- 229
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 4
Ngày tải lên :
14/09/2015, 08:40
... covered with areas exhibiting slight but varying birefringence when observed under the crossed polarizers (Figure 5.8) Despite the above, the lower 2θ peak is always present in the x- ray profile following ... polishing induced surface domains can be reliably detected only if polishing direction was roughly parallel to a certain crystallographic direction, e.g., [010]pc or [110]pc in our experiments ... domains, the surface layer does not exhibit a clear birefringent domain pattern In contrast, after directional polishing the domains (and thus their optical indicatrix) are aligned into macroscopic...
- 6
- 259
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 5
Ngày tải lên :
14/09/2015, 08:40
... Figures 6.10a-b) reveals an extinction at P/A= 45°, while the remaining domains exhibited the optical extinction at P/A= 0° This suggests that the (R+T) two phases coexisted in unpoled PZN-9%PT ... crystal axes, is thus the limiting case of MC phase when the lattice parameters am and cm are equal Because reciprocal lattice points in HR-XRD RSM are projected with respect to the pc axes, it ... between the pc axes and the axes of the various M and the O phases of the perovskite crystal Table 6.1 contains the relationship between the (002) diffractions of the m and pc axes for the various...
- 26
- 232
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 6
Ngày tải lên :
14/09/2015, 08:40
... scattered areas started to exhibit extinction at most P/A angles, suggesting the occurrence of the C phase (Figure 7.9d) Above Tmax, the sample exhibited a total extinction indicating the presence ... room temperature to Tmax ≅ 157 °C, at which the ε’ is maximum The dielectric anomaly at Tmax shows a broad frequency dependence, which has been attributed to the dynamic relaxation processes of ... with temperature until Tmax with no obvious anomaly This observation suggests that for PZN-xPT crystals with low PT contents (say, x < 5%PT), the strong dynamic relaxation processes associated...
- 21
- 240
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 7
Ngày tải lên :
14/09/2015, 08:40
... the x- ray radiation used (of 8.048 keV in energy and with an estimated penetration depth of only a few µm thick), the underlying (001)T domains could not be detected by the x- ray This would explain ... (R+T) phase mixture 8.3 Nature of rhomboedral and tetragonal micro-/nanotwin mixture in PZN(7-8)%PT at room temperature In the previous section, it has been shown that the (R+T) mixture exist in PZN-(7-8)%PT ... deduction from the above is that under the condition when T nanotwin domains exist in the crystal and/or when the x- ray radiation used is of high energy, and hence of larger penetration depth, it...
- 16
- 234
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 8
Ngày tải lên :
14/09/2015, 08:40
... to Tmax ≅ 165 ºC, the scattered areas started to exhibit extinction at most P/A angles, suggesting the occurrence of the C phase (Figure 8.14f) Above Tmax, the sample exhibited a total extinction ... scattered areas started to exhibit extinction at most P/A angles, suggesting the occurrence of the C phase (Figure 8.11f) Above Tmax, the sample exhibited a total extinction, indicating the C ... consistent with the HR-XRD results 147 Figure 8.11 shows the domain structures obtained by the PLM as a function of temperature At 25 ºC, the crystal exhibited complete optical extinction at only...
- 16
- 217
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 9
Ngày tải lên :
14/09/2015, 08:40
... entire MPB (standard + extended) region where (R+T) coexist, the crystal exhibits extremely high piezoelectric properties This suggests that the presence of (R+T) phase mixture in the form of micro/nanotwin ... phase diagram of PZN-PT system with extended (R+T) MPB region The extended (R+T) MPB region can be divided into two regions In the lower PT region, 6% ≤ x ≤ 8%, the T phase is metastable, denoted ... structure may serve as a means to relax the transformation stress in the crystal Another interesting finding of the present work is the (T+C) two phase coexistence region at high temperatures,...
- 11
- 194
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 10
Ngày tải lên :
14/09/2015, 08:40
... the vague T diffractions TNT denotes the T at ∆ω ≠ 0º 172 o ε' (x1 0 ) (a) 100 C ε' (x1 04) o (b) 105 C ε' (x1 04) (c) 115oC ε' (x1 04) o (d) 125 C 20 40 60 80 100 120 140 Temperature (oC) Figure ... the x- axis Both the KT and k31 of PZN-4.5%PT started to degrade after it was heated to 105 ºC 174 domains are parallel to the E-field direction which is normal to the fractured surface being x- rayed ... 0.09 ≤ x ≤ 0.10, both the (R+T) phase are thermodynamically stable phases at room temperature (d) The FWHM suggests that with lower PT contents (i.e., 0.045 ≤ x ≤ 0.07), the R phase has a mixed...
- 11
- 221
- 0
High resolution x ray diffraction study of phase and domain structures and thermally induced phase transformations in PZN (4 5 9)%PT 11
Ngày tải lên :
14/09/2015, 08:40
... in both the R and T phases serve to relax the transformation stresses leading to an expanded MPB across 0.06 ≤ x ≤ 0.10 in PZN-xPT single crystals This expanded (R+T) MPB region can be further ... ultra fine nanotwin structure in R, are difficult to resolve with high -synchrotron x- ray as available in SSLS Higher energy x- ray of improved 182 resolution is required to resolve these fine nanotwin ... Zhong, D E Cox, G Shirane, S-E Park and P Rehrig, Electricfield -induced phase transitions in rhombohedral Pb(Zn1/3Nb2/3)1-xTixO3, Phys Rev B, 65, p 224101 2002 32 Noheda, B., D E Cox, G Shirane,...
- 18
- 395
- 0
Báo cáo y học: "Application of Small Angle X-ray Scattering (SAXS) for Differentiation between Normal and Cancerous Breast Tissue"
Ngày tải lên :
02/11/2012, 11:08
... diagnosis using scattered X- rays J Synchrotron Rad 2000; 7: 348-352 Malden CH, Speller RD, et al A CdZnTe array for the detection of explosives in baggage by energy dispersive X- ray diffraction signatures ... Royle GJ, Hanby AM X- ray scatter signatures for normal and neoplastic breast tissues Phys Med Biol 1999; 44: 1791-1802 120 Kosanetzky J, Knoerr B, Harding G, Neitzel U, et al X- ray diffraction measurement ... None declared References Desouky OS, Ashour AH, Abdullah MI, Elshemey WM Low angle X- ray scattering from spices Radiation Physics and Chemistry 2002; 64: 267-271 Evans SH, Bradley DA, Dance DR,...
- 4
- 448
- 0
Tài liệu X-ray và con ma ppt
Ngày tải lên :
11/12/2013, 21:15
... vật liệu X- ray cho lớp da ma nên bạn chọn ID Tiếp theo thiết lập hình Tiếp theo thiết lập hình Tiếp theo thiết lập hình Tiếp theo thiết lập hình nhấp OK Tiếp theo thiết lập hình Kéo xuống chọn...
- 12
- 348
- 0
Tài liệu Characterization of the Polymorphic Behavior of an Organic Compound Using a Dynamic Thermal and X-ray Powder Diffraction Technique pptx
Ngày tải lên :
14/02/2014, 03:20
... differential scanning calorimetry (DSC); X- ray powder diffraction (XRPD); combined, simultaneous, and dynamic differential scanning calorimetry /X- ray powder diffraction (DSC/XRPD); and high performance liquid ... Form V A heat of approximately 10 J/g was observed Form V subsequently melted with an onset of approximately 245 °C and a peak at approximately 256 °C XRPD data from DSC/XRPD analysis are shown ... diameter vertical X- ray beam path through the center of the sample and reference sensors of the DSC cell Thermal isolation was maintained by using beryllium metal foil to seal the X- ray optical path...
- 16
- 549
- 0
Tài liệu Báo cáo khoa học: X-ray crystallographic and NMR studies of pantothenate synthetase provide insights into the mechanism of homotropic inhibition by pantoate docx
Ngày tải lên :
16/02/2014, 09:20
... form of nPS using X- ray crystallography, as described below A Solution and refinement of the structure using X- ray crystallography B The crystal structure of the pantoate–nPS complex was solved by ... interface and those in the vicinity exhibit high flexibility Preliminary analysis of 15N relaxation data shows that residues 118–122 have a higher degree of flexibility than other ordered regions ... carbonyl oxygen of Thr29 and the side chain oxygen of Ser54 are hydrogen-bonded to the O4 atom of pantoate via a network that consists of two water molecules The backbone carbonyl oxygen of Phe56...
- 16
- 791
- 0
Tài liệu Báo cáo khoa học: Destabilization of psychrotrophic RNase HI in a localized fashion as revealed by mutational and X-ray crystallographic analyses pdf
Ngày tải lên :
18/02/2014, 13:20
... were calculated by van’t Hoff analysis X- Ray diffraction data sets of the 6·-RNase HI crystal were collected at 100 K using synchrotron radiation at the BL44XU station in SPring-8, using a DIP6040 ... deposited in PDB under accession code 2ZQB Acknowledgements The synchrotron radiation experiments were performed at the beam line BL44XU in SPring-8 with the approval of the Institute for Protein ... stability and flexibility in glycosidases adapted to extreme thermal environments J Mol Biol 328, 419– 428 D’Amico S, Marx JC, Gerday C & Feller G (2003) Activity–stability relationships in extremophilic...
- 11
- 648
- 0
Tài liệu Báo cáo khoa học: Molecular determinants of ligand specificity in family 11 carbohydrate binding modules – an NMR, X-ray crystallography and computational chemistry approach doc
Ngày tải lên :
18/02/2014, 17:20
... in the X- ray structures of CBM4 and CBM17 complexed with cellopentaose and cellohexaose, respectively [13,23] The involvement of the tyrosine residues in the stabilization of the complex cannot ... analyze the binding of cellohexaose to CtCBM11 The STD-NMR spectrum of the hexasaccharide in a 20-fold excess over CtCBM11 is shown in Fig along with the cellohexa- II IV H2b-e H2f αH2a H6’f ... four terms: GOLD GoldScore fitness ¼ Shb ext þ Svdw ext þ Shb int þ Svdw int ð2Þ in which Shb_ext is the protein–ligand hydrogen bond score and Svdw_ext is the van der Walls score Shb_int is the...
- 12
- 687
- 0
Tài liệu Báo cáo khoa học: NMR structure of AII in solution compared with the X-ray structure of AII bound to the mAb Fab131 pptx
Ngày tải lên :
20/02/2014, 23:20
... 512 complex data points and 16 scans per increment for 2D TOCSY and 64 scans for 2D NOESY experiments, respectively The mixing time for TOCSY spectra was 80 ms Mixing times for NOESY experiments ... and the yellow the side chains of Val3 and Pro7) (a) with the the X- ray structure of AII in the Fab131–AII complex [30] (b) exclude solvent by filling the cavity The most buried residues of AII ... shown in grey, oxygen atoms in red, nitrogen atoms in blue, and hydrogen atoms in white provided for the cis X- Pro isomers of several peptides with the sequence motif X- Pro-Phe [61] (X stands for...
- 12
- 597
- 0