Automatic Face Recognition System Based on Local Fourier-Bessel Features

We present an automatic face verification system inspired by known properties of biological systems. In the proposed algorithm the whole image is converted from the spatial to polar frequency domain by a Fourier-Bessel Transform (FBT). Using the whole image is compared to the case where only face image regions (local analysis) are considered. The resulting representations are embedded in a dissimilarity space, where each image is represented by its distance to all the other images, and a Pseudo-Fisher discriminator is built. Verification test results on the FERET database showed that the local-based algorithm outperforms the global-FBT version. The local-FBT algorithm performed as state-of-the-art methods under different testing conditions, indicating that the proposed system is highly robust for expression, age, and illumination variations. We also evaluated the performance of the proposed system under strong occlusion conditions and found that it is highly robust for up to 50% of face occlusion. Finally, we automated completely the verification system by implementing face and eye detection algorithms. Under this condition, the local approach was only slightly superior to the global approach.Comment: 2005, Brazilian Symposium on Computer Graphics and Image Processing, 18 (SIBGRAPI

Curie Points and Direct Current Electrical Conductivity for Inverse Li-Spinel Ferrite Replaced by Zn2+ Ion

The conventional ceramic double sintering method was used to prepare a series of mixed Li-Zn spinel ferrites (SFs) Direct electric (DC) electrical conductivity (σ) and inductance (L) were studied for the prepared series of samples from room temperature to well beyond the Curie point (TC). σ was measured as a function of temperature, the relation between lnσ with 1/T indicated that σ was increased with increasing of the temperature, which proves that the prepared samples have a semiconductor behavior. The maximum value of the σ was reported for the sample of x = 0.8. The σ results were interpreted in terms of hopping model. The relation between lnσT and 1/T showed a change in the slope which is attributed to the change of samples from ferrimagnetic to paramagnetic at TC. The values of L increased exponentially from room temperature up to TC, and then they decreased sharply. The calculated activation energy Ea in the ferromagnetic region was less than that in paramagnetic region. The calculated activation energy (Ea) decreased with increasing of Zn content. The values of the TC for the prepared samples were determined from σ and L measurements, which decreased with increasing of Zn content.The conventional ceramic double sintering method was used to prepare a series of mixed Li-Zn spinel ferrites (SFs) Direct electric (DC) electrical conductivity (σ) and inductance (L) were studied for the prepared series of samples from room temperature to well beyond the Curie point (TC). σ was measured as a function of temperature, the relation between lnσ with 1/T indicated that σ was increased with increasing of the temperature, which proves that the prepared samples have a semiconductor behavior. The maximum value of the σ was reported for the sample of x = 0.8. The σ results were interpreted in terms of hopping model. The relation between lnσT and 1/T showed a change in the slope which is attributed to the change of samples from ferrimagnetic to paramagnetic at TC. The values of L increased exponentially from room temperature up to TC, and then they decreased sharply. The calculated activation energy Ea in the ferromagnetic region was less than that in paramagnetic region. The calculated activation energy (Ea) decreased with increasing of Zn content. The values of the TC for the prepared samples were determined from σ and L measurements, which decreased with increasing of Zn content

Synthesis and ac properties of mixed li-zn ferrites

The mixed polycrystalline ferrites 〖Li〗_0.5(1-x) 〖Zn〗_x 〖Fe〗_(2.5-0.5x) O_4 were prepared by the conventional solid state method using high purity metal oxides ZnO,〖Fe〗_2 O_3 and LiCO_3for different concentration of Zn2+ions. Double probe electrode method was used to study the AC properties: the AC electrical conductivity (σ), the dielectric constant: real(ε'), imaginary (ε'') and complex (ε*), and the dielectric loss tangent (tan δ) over therange of the appliedfrequency (f=1 KHz-5 MHz)at room temperature. σincreased exponentially with the increasing f where the maximum value was for the sample 〖Li〗_0.3 〖Zn〗_0.4 〖Fe〗_2.3 O_4. The obtained results of the dielectric parameter (ε', ε'', ε* andtan δ), also, decreased exponentially with increasing f, which confirmsthe normal spinel ferrite behavior. The behavior of AC propertiescan be elucidated on the basis of the exchanged electrons between . The obtained results reveal that the AC properties change by substitution of the Zn2+ionsin Li-spinel ferrite matrix.The mixed polycrystalline ferrites 〖Li〗_0.5(1-x) 〖Zn〗_x 〖Fe〗_(2.5-0.5x) O_4 were prepared by the conventional solid state method using high purity metal oxides ZnO,〖Fe〗_2 O_3 and LiCO_3for different concentration of Zn2+ions. Double probe electrode method was used to study the AC properties: the AC electrical conductivity (σ), the dielectric constant: real(ε'), imaginary (ε'') and complex (ε*), and the dielectric loss tangent (tan δ) over therange of the appliedfrequency (f=1 KHz-5 MHz)at room temperature. σincreased exponentially with the increasing f where the maximum value was for the sample 〖Li〗_0.3 〖Zn〗_0.4 〖Fe〗_2.3 O_4. The obtained results of the dielectric parameter (ε', ε'', ε* andtan δ), also, decreased exponentially with increasing f, which confirmsthe normal spinel ferrite behavior. The behavior of AC propertiescan be elucidated on the basis of the exchanged electrons between . The obtained results reveal that the AC properties change by substitution of the Zn2+ionsin Li-spinel ferrite matrix

Upper limits for the photoproduction cross section for the phi(--)(1860) pentaquark state off the deuteron

We searched for the phi(--)(1860) pentaquark in the photoproduction process off the deuteron in the Xi(-)pi(-)-decay channel using CLAS. The invariant-mass spectrum of the Xi(-)pi(-) system does not indicate any statistically significant enhancement near the reported mass M = 1.860 GeV. The statistical analysis of the sideband-subtracted mass spectrum yields a 90%-confidence-level upper limit of 0.7 nb for the photoproduction cross section of phi(--)(1860) with a consecutive decay into Xi(-)pi(-) in the photon-energy range 4.5 GeV \u3c E-gamma \u3c 5.5 GeV

Pengaruh Penggunaan Media Powtoon Terhadap Peningkatan Hasil Menulis Teks Persuasi pada Siswa Kelas VIII SMP Islam Dampit Kabupaten Malang

One of the functions of media in learning is to improve student learning outcomes. Therefore, the media plays a very important role. This research was conducted to determine the effect of using Powtoon media on improving the results of writing persuasive texts for class VIII Islamic Middle School students in Dampit, Malang district. The data in this study was obtained through pretest and posttest and analyzed statistically using computerized SPSS version 19.0 with regression analysis and hypothesis testing. Based on data analysis, a percentage number was obtained; Powtoon media coefficient, simple correlation coefficient, coefficient of determination, F significance respectively; 29.3%, 77.1%, 59.4%, and 40.6% which shows that Powtoon media has a significant influence on increasing the ability to write persuasive texts of students in class VIII of Dampit Islamic Middle School, Malang district, so it can be recommended as a media effective learning is related to students' writing skills and persuasive texts.Salah satu penentuan fungsi penggunaan suatu media dalam Media dalam pembelajaran salah satunya berfungsi untuk meningkatkan hasil belajar siswa. Oleh karena itu, media memegang peran yang sangat penting. Penelitian ini dilakukan untuk mengetahui pengaruh penggunaan media Powtoon terhadap peningkatan hasil menulis teks persuasi siswa kelas VIII SMP Islam Dampit Kabupaten Malang. Data dalam penelitian ini diperoleh melalui tes-pretest dan postest dan dianalisis secara statistik menggunakan komputerisasi SPSS versi 19.0 dengan analisis regresi serta uji hipotesa. Berdasarkan analisis data, diperoleh jumlah persentase; kooefisien media Powtoon, kooefisien korelasi sederhana, koefisien determinasi, signifikansi F secara berturut-turut; 29,3%, 77,1%, 59,4%, dan 40,6% yang menunjukkan bahwa media Powtoon memiliki pengaruh yang signifikan terhadap peningkatan kemampuan menulis teks persuasi siswa di kelas VIII SMP Islam Dampit kabupaten Malang, sehingga dapat direkomendasikan menjadi media pembelajaran yang efektif berkaitan dengan keterampilan menulis siswa dan teks persuasi

The Admissions Process in Occupational Therapy Education: Investigating Academic and Non-academic Metrics in the Applicant Selection Process

The overall goal for any admissions process is to analyze criteria and identify the prospective students that have the highest potential for success in the program’s curriculum and in the field as a practicing clinician. The purpose of this study was to examine common academic and non-academic criteria utilized in occupational therapy (OT) admission processes and determine what criteria are used by programs with 100% student pass ratings on their National Board for Certification in Occupational Therapy (NBCOT) exam following completion of an OT program. Admissions criteria components and NBCOT pass rates were collected from the top 107 OT programs, as reported by US News and World Report, using publicly available websites for each program and the NBCOT webpage. Descriptive statistics were recorded regarding the frequency of utilizing various admissions criteria. Chi-square tests were utilized to examine the relationship between each admissions criteria component and the NBCOT pass rate. Admissions criteria frequently utilized by the top OT programs included a bachelor’s degree prior to matriculation (90.99% programs), minimum undergraduate GPA (55.86%), personal statement (90.09%), letters of recommendation (97.30%), observation hours (74.77%), and an interview (61.26%). Few programs required applicants to submit a minimum math/science GPA (11.71%) or a writing sample (40.54%). Results did not reveal a statistically significant difference between analyzed criteria groups. It is likely that NBCOT pass rates are impacted by other factors that were not publicly available or included in this study

Scaling and Universality in the Counterion-Condensation Transition at Charged Cylinders

We address the critical and universal aspects of counterion-condensation transition at a single charged cylinder in both two and three spatial dimensions using numerical and analytical methods. By introducing a novel Monte-Carlo sampling method in logarithmic radial scale, we are able to numerically simulate the critical limit of infinite system size (corresponding to infinite-dilution limit) within tractable equilibration times. The critical exponents are determined for the inverse moments of the counterionic density profile (which play the role of the order parameters and represent the inverse localization length of counterions) both within mean-field theory and within Monte-Carlo simulations. In three dimensions (3D), correlation effects (neglected within mean-field theory) lead to an excessive accumulation of counterions near the charged cylinder below the critical temperature (condensation phase), while surprisingly, the critical region exhibits universal critical exponents in accord with the mean-field theory. In two dimensions (2D), we demonstrate, using both numerical and analytical approaches, that the mean-field theory becomes exact at all temperatures (Manning parameters), when number of counterions tends to infinity. For finite particle number, however, the 2D problem displays a series of peculiar singular points (with diverging heat capacity), which reflect successive de-localization events of individual counterions from the central cylinder. In both 2D and 3D, the heat capacity shows a universal jump at the critical point, and the energy develops a pronounced peak. The asymptotic behavior of the energy peak location is used to locate the critical temperature, which is also found to be universal and in accordance with the mean-field prediction.Comment: 31 pages, 16 figure

Examining the Effect of Introducing a Link from Electrical Excitation to Calcium Dynamics in a Cardiomyocyte

Calcium dysregulation is a significant cause of fatal cardiac arrythmias, but it is an incompletely understood phenomenon and difficult to predict. Cardiac calcium levels can be modeled as a system of partial differential equations linking the electrical excitation, calcium signaling, and mechanical contraction dynamics of the heart. A complete calcium induced calcium release model uses reaction-diffusion equations to fully link these three systems. Simulations examine the effect of introducing the link from calcium signaling to electrical excitation. In particular, we perform a parameter study on the strength of the feedback connection with both links between calcium signaling and electrical excitation enabled. Simulations indicate that the feedback and feedforward between electrical excitation and calcium signaling can influence the voltage in a physiologically realistic way