2,181 research outputs found
Deformable Generator Network: Unsupervised Disentanglement of Appearance and Geometry
We present a deformable generator model to disentangle the appearance and
geometric information for both image and video data in a purely unsupervised
manner. The appearance generator network models the information related to
appearance, including color, illumination, identity or category, while the
geometric generator performs geometric warping, such as rotation and
stretching, through generating deformation field which is used to warp the
generated appearance to obtain the final image or video sequences. Two
generators take independent latent vectors as input to disentangle the
appearance and geometric information from image or video sequences. For video
data, a nonlinear transition model is introduced to both the appearance and
geometric generators to capture the dynamics over time. The proposed scheme is
general and can be easily integrated into different generative models. An
extensive set of qualitative and quantitative experiments shows that the
appearance and geometric information can be well disentangled, and the learned
geometric generator can be conveniently transferred to other image datasets to
facilitate knowledge transfer tasks.Comment: version
The Study of Microwave and Electric Hybrid Sintering Process of AZO Target
We simulated the microwave sintering of ZnO by 3D modelling. A large-size Al-doped ZnO (AZO) green ceramic compact was prepared by slurry casting. Through studying the microwave and electric hybrid sintering of the green compact, a relative density of up to 98.1% could be obtained by starting microwave heating at 1200°C and increasing the power 20 min later to 4 kW for an AZO ceramic target measuring 120 × 240 × 12 mm. The resistivity of AZO targets sintered with microwave assistance was investigated. The energy consumption of sintering could be greatly reduced by this heating method. Until now, few studies have been reported on the microwave and electric hybrid sintering of large-size AZO ceramic targets. This research can aid in developing sintering technology for large-size high-quality oxide ceramic targets
Klinička primjena RT-PCR u otkrivanju DNK tuberkuloze u kombinaciji s TB-IGRA u dijagnostici plućne tuberkuloze s negativnim nalazom sputuma
The aim was to investigate detection of pulmonary alveolar lavage fluid tuberculosis
DNA by real-time fluorescent polymerase chain reaction (RT-PCR) combined with clinical application
of the sputum smear-negative pulmonary tuberculosis diagnosis with TB interferon-γ release
assay (TB-IGRA). From October 2014 to October 2015, 632 outpatients and inpatients treated in our
hospital were randomly selected, of which 459 patients as the research group managed with RT-PCR
detection combined with TB-IGRA and 173 patients as the control group undergoing electronic
bronchoscopy alveolar lavage fluid detection, with detection results statistically evaluated. The positive
rate in the research group was 96.51%, i.e. significantly higher than that in the control group (66.47%),
yielding a statistically significant difference (χ2=109.68, p=0.00). The true positive rate was 97.7% in
the research group and 67.92% in the control group; the true positive rate was significantly higher in
the research group patients as compared with the control group, yielding a statistically significant difference
(χ2=112.04, p=0.00). The sensitivity and specificity, as well as Youden index were significantly
higher in the research group as compared with the control group. In conclusion, TB DNA detection
by RT-PCR combined with TB-IGRA is a very good method of diagnosing tuberculosis, and it can
be implemented in clinical diagnosis of pulmonary tuberculosis.Cilj istraživanja bio je ispitati otkrivanje DNK tuberkuloze u plućnom alveolarnom ispirku pomoću lančane reakcije
polimeraze u stvarnom vremenu s fluorescentnim bojama (RT-PCR) u kombinaciji s kliničkom primjenom dijagnostike
plućne tuberkuloze s negativnim nalazom sputuma pomoću testa otpuštanja TB interferona-γ (TB-IGRA). Od listopada
2014. do listopada 2015. godine nasumce su odabrane 632 osobe bolnički i izvanbolnički liječene u našoj bolnici, od kojih
je 459 uključeno u ispitnu skupinu podvrgnutu otkrivanju pomoću RT-PCR u kombinaciji s testom TB-IGRA, a 173 u
kontrolnu skupinu podvrgnutu elektroničkom otkrivanju u bronhoskopskom alveolarnom ispirku; rezultati su statistički
obrađeni. Stopa pozitivnih nalaza bila je 96,51% u ispitnoj skupini, odnosno značajno viša od one u kontrolnoj skupini
(66,47%), uz statistički značajnu razliku (χ2=109,68; p=0,00). Stopa stvarno pozitivnih nalaza bila je 97,7% u ispitnoj skupini
i 67,92% u kontrolnoj skupini, dakle značajno viša kod bolesnika ispitne skupine u usporedbi s kontrolnom skupinom, uz
statistički značajnu razliku (χ2=112,04; p=0,00). Osjetljivost i specifičnost, kao i Youdenov indeks bili su značajno viši u
ispitnoj skupini u usporedbi s kontrolnom skupinom. U zaključku, otkrivanje TB DNK pomoću RT-PCR u kombinaciji s
TB-IGRA vrlo je dobra metoda za dijagnosticiranje tuberkuloze, koja se može primjenjivati u kliničkoj dijagnostici plućne
tuberkuloze
On the laboratory calibration of dielectric permittivity models for agricultural soils: Effect of systematic porosity variation
Dielectric techniques are fundamental methods for measuring soil water content, and they commonly rely on the conventional laboratory calibration of the dielectric permittivity models between a dielectric constant and water content. As a non-negligible factor, porosity has been constructed differently in some models as a calibration constant, but the systematic porosity variations during the laboratory model calibration and field applications are not yet well addressed. Based on time-domain reflectometer laboratory calibration experiments, this study investigated this issue using three preestablished dielectric permittivity models: the Purdue calibration equation (American Society for Testing and Materials model [ASTM]), the complex refractive index model (CRIM), and a piecewise CRIM model (CRIMP). Results demonstrate that a generalized porosity constant used in the calibration would bring in additional structural bias compared with the calibration using variable porosities, and its magnitude varies with the model structure. The deviation of the generalized porosity constant can further amplify the structural bias of ASTM and CRIM for soils with low clay content, but it is insensitive for the soils with high clay content due to the overwhelming role of model structure error. Only the model CRIMP with a “perfect” model structure can effectively cope with the systematic porosity variation and keep a stable built-in capability for estimating calibration constants from readily available soil data. These findings highlight ignoring porosity variation should not be taken for granted for calibrating and applying the preestablished models
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