Journal articles: 'Index gamma'

1

Gu, Xuejun, Xun Jia, and Steve B. Jiang. "GPU-based fast gamma index calculation." Physics in Medicine and Biology 56, no. 5 (2011): 1431–41. http://dx.doi.org/10.1088/0031-9155/56/5/014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Sarkar, Biplab, Anirudh Pradhan, and T. Ganesh. "Derivative based sensitivity analysis of gamma index." Journal of Medical Physics 40, no. 4 (2015): 240. http://dx.doi.org/10.4103/0971-6203.170789.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Tabor, Zbisław, Monika Tulik, Damian Kabat, and Anna Wydra. "[P254] Local gamma index analysis - new approach." Physica Medica 52 (August 2018): 171–72. http://dx.doi.org/10.1016/j.ejmp.2018.06.533.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

HARTMAN, YAIR, YURI LIMA, and OMER TAMUZ. "An Abramov formula for stationary spaces of discrete groups." Ergodic Theory and Dynamical Systems 34, no. 3 (2013): 837–53. http://dx.doi.org/10.1017/etds.2012.167.

Full text

Abstract:

AbstractLet $(G, \mu )$ be a discrete group equipped with a generating probability measure, and let $\Gamma $ be a finite index subgroup of $G$. A $\mu $-random walk on $G$, starting from the identity, returns to $\Gamma $ with probability one. Let $\theta $ be the hitting measure, or the distribution of the position in which the random walk first hits $\Gamma $. We prove that the Furstenberg entropy of a $(G, \mu )$-stationary space, with respect to the action of $(\Gamma , \theta )$, is equal to the Furstenberg entropy with respect to the action of $(G, \mu )$, times the index of $\Gamma $ in $G$. The index is shown to be equal to the expected return time to $\Gamma $. As a corollary, when applied to the Furstenberg–Poisson boundary of $(G, \mu )$, we prove that the random walk entropy of $(\Gamma , \theta )$ is equal to the random walk entropy of $(G, \mu )$, times the index of $\Gamma $ in $G$.

APA, Harvard, Vancouver, ISO, and other styles

5

DeGaetano, Arthur T., Brian N. Belcher, and William Noon. "Temporal and Spatial Interpolation of the Standardized Precipitation Index for Computational Efficiency in the Dynamic Drought Index Tool." Journal of Applied Meteorology and Climatology 54, no. 4 (2015): 795–810. http://dx.doi.org/10.1175/jamc-d-14-0088.1.

Full text

Abstract:

AbstractThe feasibility of interpolating gamma-distribution parameters between different precipitation accumulation intervals (durations) is statistically evaluated. The interpolation of these parameters for a specific accumulation interval, but ending on different dates, is similarly assessed. Such interpolation increases the computational efficiency of drought-monitoring tools that require calculation of the standardized precipitation index (SPI) for any user-specified accumulation period on any given day. Spatial interpolation of the distribution parameters is also assessed. Given a 60-yr period of record, few statistically significant differences were found between gamma-distribution percentiles interpolated between fixed base durations and those computed directly. Shorter interpolation intervals (generally 30 days) were required for the shortest (e.g., 30 days) durations, whereas interpolation over periods of as long as 180 days could be used for the longest (between 360 and 720 days) durations. Interpolating the distribution parameters to different ending dates on the basis of those computed for the end of each month was also appropriate. The spatial interpolation of gamma-distribution parameters, although viable in practice for monitoring large-scale drought conditions, was associated with larger SPI differences than was the spatial interpolation of the SPI index itself or the interpolation of historical precipitation and the subsequent calculation of gamma-distribution parameters on the basis of these values.

APA, Harvard, Vancouver, ISO, and other styles

6

Budgell, G. J. "SP-0639: Current status of gamma index use." Radiotherapy and Oncology 111 (2014): S247. http://dx.doi.org/10.1016/s0167-8140(15)30745-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Chen, M., X. Mo, D. Parnell, G. Olivera, D. Galmarini, and W. Lu. "Impact of Image Noise on Gamma Index Calculation." Journal of Physics: Conference Series 489 (March 24, 2014): 012072. http://dx.doi.org/10.1088/1742-6596/489/1/012072.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Yang, JiangHe, JunHui Fan, JianJun Nie, and RuShu Yang. "The gamma-ray spectral index changes for blazars." Science China Physics, Mechanics and Astronomy 55, no. 11 (2012): 2179–85. http://dx.doi.org/10.1007/s11433-012-4901-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Kang, Joon Soon, Yong Tak Kwon, Young Ju Suh, Tong Joo Lee, and Dong Jin Ryu. "Outcomes of U-Blade Lag Screw for Cephalomedullary Fixation of Unstable Trochanteric Femur Fractures: A Case Control Study." Geriatric Orthopaedic Surgery & Rehabilitation 11 (January 1, 2020): 215145932097997. http://dx.doi.org/10.1177/2151459320979975.

Full text

Abstract:

Background: Unstable trochanteric femur fractures in elderly patients with osteoporosis are still challenging. Gamma3 nail with the U-blade lag screw (U-blade gamma nail) has been developed to improve mechanical stability of proximal femoral fragment. This study aimed to compare the clinical and radiologic outcomes of U-blade gamma nail to proximal femoral nail antirotation (PFNA), and standard Gamma3 nail (gamma nail) for unstable trochanteric femur fractures. Methods: A retrospective matched-pair case study was performed with U-blade gamma nail, PFNA, and gamma nail. During 2012-2018, 970 patients with unstable trochanteric femur fractures were reviewed. Matching criteria were set as follows: 1) sex; 2) age (± 3 years); 3) body mass index (± 2 kg/m2); 4) bone mineral density (± 1 T-score in femur neck). Finally, a total of 159 patients were enrolled. We assessed the tip-apex distance (TAD), neck shaft angle, and hip screw sliding distance using plain radiographs. Also, we evaluated the clinical outcomes with Koval’s grade and fixation failure during 2 years. Results: The mean postoperative TAD was not significantly different among the 3 groups (p = 0.519). However, the change in the TAD at 1 year (p = 0.027) and 2 years (p = 0.008) after surgery was significantly smaller in U-blade gamma nail group compared with PFNA and gamma nail group. The hip screw sliding distance at 1 year (p = 0.004) and 2 years (p = 0.001) after surgery was significantly smaller in U-blade gamma nail group compared with PFNA and gamma nail group. However, there was no significant difference of Koval’s grade and fixation failure among the 3 groups (p = 0.535). Conclusion: U-blade gamma nail showed favorable radiologic results in terms of the change in the hip screw position. However, U-blade gamma nail was not superior to PFNA and gamma nail in clinical outcomes.

APA, Harvard, Vancouver, ISO, and other styles

10

Arahmane, Hanane, El-Mehdi Hamzaoui, and Rajaa Cherkaoui El Moursli. "Improving Neutron-Gamma Discrimination with Stilbene Organic Scintillation Detector Using Blind Nonnegative Matrix and Tensor Factorization Methods." Journal of Spectroscopy 2019 (May 30, 2019): 1–9. http://dx.doi.org/10.1155/2019/8360395.

Full text

Abstract:

In order to perform highly qualified neutron-gamma discrimination in mixed radiation field, we investigate the application of blind source separation methods based on nonnegative matrix and tensor factorization algorithms as new and robust neutron-gamma discrimination software-based approaches. These signal processing tools have allowed to recover original source components from real-world mixture signals which have been recorded at the output of the stilbene scintillation detector. The computation of the performance index of separability of each tested nonnegative algorithm has allowed to select Second-Order NMF algorithm and NTF-2 model as the most efficient techniques for discriminating neutrons and gammas. Furthermore, the neutron-gamma discrimination is highlighted through the computation of the cross-correlation function. The performance of the blind source separation methods has been quantified through the obtained results that prove a good neutron-gamma separation.

APA, Harvard, Vancouver, ISO, and other styles

11

Pierre, Laurent, and Jean-Marc Farinone. "Context-free languages with rational index in $\Theta (n^\gamma )$ for algebraic numbers $\gamma $." RAIRO - Theoretical Informatics and Applications 24, no. 3 (1990): 275–322. http://dx.doi.org/10.1051/ita/1990240302751.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

La Verde, Giuseppe, Adelaide Raulo, Vittoria D’Avino, Vincenzo Roca, Riccardo de Asmundis, and Mariagabriella Pugliese. "Green Tuff: Gamma Index in a Typical Building Material of Ciglio Area (Ischia Island)." Solid State Phenomena 319 (June 14, 2021): 24–29. http://dx.doi.org/10.4028/www.scientific.net/ssp.319.24.

Full text

Abstract:

Radiological characterization of tuff of Ciglio area in Ischia Island was performed to assess the potential radiological hazard associated with its use. For this purpose, high resolution gamma-ray spectroscopy was used. In five green tuff samples was measured the activity concentration of natural gamma-ray emitting radionuclides 226Ra, 232Th and 40K so, the mean gamma index was calculated. The mean value of the gamma index resulted lower than the reference level and it meets the dose criterion for the safety use of green tuff as building material.

APA, Harvard, Vancouver, ISO, and other styles

13

Damascelli, Lucio, and Filomena Pacella. "Morse index and symmetry for elliptic problems with nonlinear mixed boundary conditions." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 149, no. 2 (2018): 305–24. http://dx.doi.org/10.1017/prm.2018.29.

Full text

Abstract:

AbstractWe consider an elliptic problem of the type $$\left\{ {\matrix{ {-\Delta u = f(x,u)\quad } \hfill & {{\rm in}\,\Omega } \hfill \cr {u = 0} \hfill & {{\rm on}\,\Gamma _1} \hfill \cr {\displaystyle{{\partial u} \over {\partial \nu }} = g(x,u)} \hfill & {{\rm on}\,\Gamma _2} \hfill \cr } } \right.$$ where Ω is a bounded Lipschitz domain in ℝN with a cylindrical symmetry, ν stands for the outer normal and $\partial \Omega = \overline {\Gamma _1} \cup \overline {\Gamma _2} $.Under a Morse index condition, we prove cylindrical symmetry results for solutions of the above problem.As an intermediate step, we relate the Morse index of a solution of the nonlinear problem to the eigenvalues of the following linear eigenvalue problem $$\left\{ {\matrix{ {-\Delta w_j + c(x)w_j = \lambda _jw_j} \hfill & {{\rm in }\Omega } \hfill \cr {w_j = 0} \hfill & {{\rm on }\Gamma _1} \hfill \cr {\displaystyle{{\partial w_j} \over {\partial \nu }} + d(x)w_j = \lambda _jw_j} \hfill & {{\rm on }\Gamma _2} \hfill \cr } } \right.$$ For this one, we construct sequences of eigenvalues and provide variational characterization of them, following the usual approach for the Dirichlet case, but working in the product Hilbert space L2 (Ω) × L2(Γ2).

APA, Harvard, Vancouver, ISO, and other styles

14

Энгельберт, Ганс-Юрген, Hans-Jurgen Engelbert, Vladimir P. Kurenok, and Vladimir P. Kurenok. "The Tanaka formula for symmetric stable processes with index $\alpha$, $0<\alpha<2$." Teoriya Veroyatnostei i ee Primeneniya 64, no. 2 (2019): 328–57. http://dx.doi.org/10.4213/tvp5252.

Full text

Abstract:

Для симметричного $\alpha$-устойчивого процесса $Z=(Z_t)_{t\ge0}$, $0<\alpha<2$, любого $a\in\mathbf{R}$ и $\gamma\in(0,2)$ такого, что $\alpha-1<\gamma<\alpha$, мы приводим в явном виде разложение Дуба-Мейера для субмартингала $|Z-a|^\gamma=(|Z_t-a|^{\gamma})_{t\ge0}$, состоящее из константы $|a|^{\gamma}$, стохастического интеграла по компенсированной пуассоновской случайной мере, ассоциированной с $Z$, и предсказуемого возрастающего процесса. Для $1<\alpha<2$ мы рассматриваем также случай $\gamma=\alpha-1$, соответствующий знаменитой формуле Танака. Это распространяет результаты Салминена и Йора [11] на общий случай $0<\alpha<2$ с использованием альтернативного подхода. Работы по близкой проблематике: Танака [13], Фитцсиммонс и Гетур [4], Т. Ямада [16] и К. Ямада [15].

APA, Harvard, Vancouver, ISO, and other styles

15

BAHLEKEH, ABDOLNASER. "(STRONGLY) GORENSTEIN FLAT MODULES OVER GROUP RINGS." Bulletin of the Australian Mathematical Society 90, no. 1 (2013): 57–64. http://dx.doi.org/10.1017/s000497271300107x.

Full text

Abstract:

AbstractLet $\Gamma $ be a group and ${\Gamma }^{\prime } $ be a subgroup of $\Gamma $ of finite index. Let $M$ be a $\Gamma $-module. It is shown that $M$ is (strongly) Gorenstein flat if and only if it is (strongly) Gorenstein flat as a ${\Gamma }^{\prime } $-module. We also provide some criteria in which the classes of Gorenstein projective and strongly Gorenstein flat $\Gamma $-modules are the same.

APA, Harvard, Vancouver, ISO, and other styles

16

Kozakova, Michaela, Carlo Palombo, Marco Paterni Eng, et al. "Fatty liver index, gamma-glutamyltransferase, and early carotid plaques." Hepatology 55, no. 5 (2012): 1406–15. http://dx.doi.org/10.1002/hep.25555.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Chen, Mingli, Weiguo Lu, Quan Chen, Kenneth Ruchala, and Gustavo Olivera. "Efficient gamma index calculation using fast Euclidean distance transform." Physics in Medicine and Biology 54, no. 7 (2009): 2037–47. http://dx.doi.org/10.1088/0031-9155/54/7/012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Shaviya, Nathan, Valentine Budambula, Mark K. Webale, and Tom Were. "Circulating Interferon-Gamma Levels Are Associated with Low Body Weight in Newly Diagnosed Kenyan Non-Substance Using Tuberculosis Individuals." Interdisciplinary Perspectives on Infectious Diseases 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/9415364.

Full text

Abstract:

Although interferon-gamma, interleukin-10, and adiponectin are key immunopathogenesis mediators of tuberculosis, their association with clinical manifestations of early stage disease is inconclusive. We determined interferon-gamma, interleukin-10, and adiponectin levels in clinically and phenotypically well-characterised non-substance using new pulmonary tuberculosis patients (n=13) and controls (n=14) from Kenya. Interferon-gamma levels (P<0.0001) and interferon-gamma to interleukin-10 (P<0.001) and interferon-gamma to adiponectin (P=0.027) ratios were elevated in tuberculosis cases. Correlation analyses in tuberculosis cases showed associations of interferon-gamma levels with body weight (ρ=-0.849;P<0.0001), body mass index (ρ=0.664;P=0.013), hip girth (ρ=-0.579;P=0.038), and plateletcrit (ρ=0.605;P=0.028); interferon-gamma to interleukin-10 ratio with diastolic pressure (ρ=-0.729;P=0.005); and interferon-gamma to adiponectin ratio with body weight (ρ=-0.560;P=0.047), body mass index (ρ=-0.604;P=0.029), and plateletcrit (ρ=0.793;P=0.001). Taken together, our results suggest mild-inflammation in early stage infection characterised by upregulation of circulating interferon-gamma production in newly infected TB patients.

APA, Harvard, Vancouver, ISO, and other styles

19

Singal, Jack, Allan Ko, and Vahe Petrosian. "Flat Spectrum Radio Quasar Evolution and the Gamma-ray Background." Proceedings of the International Astronomical Union 9, S304 (2013): 149–52. http://dx.doi.org/10.1017/s1743921314003597.

Full text

Abstract:

AbstractWe discuss an analysis of the redshift evolutions and distributions of the gamma-ray luminosity and photon spectral index of flat spectrum radio quasar (FSRQ) type blazars. We utilize data from the Fermi Gamma-ray Space Telescope, with redshfits as determined from optical spectroscopy by Shaw et al. We find that FSRQs have evolved significantly in luminosity but negligibly in photon index, and contribute in toto roughly 20% of the total gamma-ray output of the Universe.

APA, Harvard, Vancouver, ISO, and other styles

20

Blain, Gabriel C., and Monica C. Meschiatti. "Inadequacy of the gamma distribution to calculate the Standardized Precipitation Index." Revista Brasileira de Engenharia Agrícola e Ambiental 19, no. 12 (2015): 1129–35. http://dx.doi.org/10.1590/1807-1929/agriambi.v19n12p1129-1135.

Full text

Abstract:

ABSTRACT The Standardized Precipitation Index was developed as a probability-based index able to monitor rainfall deficit in a standardized or normalized way. Thus, the performance of this drought index is affected by the use of a distribution that does not provide an appropriate fit for the rainfall data. The goal of this study was to evaluate the adjustment of the gamma distribution for the rainfall amounts summed over several time scales (Pelotas, Rio Grande do Sul, Brazil), to assess the goodness-of-fit of alternative distributions to these rainfall series and to evaluate the normality assumption of the Standardized Precipitation Index series calculated from several distributions. Based on the Lilliefors test and on a normality test, it is verified that the gamma distribution is not suitable for calculating this Index in several timescales. The generalized normal distribution presented the best performance among all analysed distributions. It was also concluded that the drought early warning systems and the academic studies should re-evaluate the use of the gamma distribution in the Standardized Precipitation Index calculation algorithm. A computational code that allows calculating this drought index based on the generalized normal distribution has also been provided.

APA, Harvard, Vancouver, ISO, and other styles

21

Toker, Kemal. "Tensor Product Of Zero-divisor Graphs With Finite Free Semilattices." Journal of Mathematics Research 9, no. 1 (2017): 13. http://dx.doi.org/10.5539/jmr.v9n1p13.

Full text

Abstract:

$\Gamma (SL_{X})$ is defined and has been investigated in (Toker, 2016). In this paper our main aim is to extend this study over $\Gamma (SL_{X})$ to the tensor product. The diameter, radius, girth, domination number, independence number, clique number, chromatic number and chromatic index of $\Gamma (SL_{X_{1}})\otimes \Gamma (SL_{X_{2}})$ has been established. Moreover, we have determined when $\Gamma (SL_{X_{1}})\otimes \Gamma (SL_{X_{2}})$ is a perfect graph.

APA, Harvard, Vancouver, ISO, and other styles

22

Li, Hui Shu, and Hong Hai Li. "A note on the least (normalized) laplacian eighva;ue of signed graphs." Tamkang Journal of Mathematics 47, no. 3 (2016): 271–78. http://dx.doi.org/10.5556/j.tkjm.47.2016.1942.

Full text

Abstract:

Let $\Gamma=(G, \sigma)$ be a connected signed graph, and $L(\Gamma)$ be its Laplacian and $\mathcal{L}(\Gamma)$ its normalized Laplacian with eigenvalues $\lambda_1\geq \lambda_2\geq\cdots \geq \lambda_n$ and $\mu_1\geq \mu_2\geq\cdots \geq \mu_n$, respectively. It is known that a signed graph $\Gamma$ is balanced if and only if $\lambda_n=0$ (or $\mu_n=0$). We show that $\lambda_n$ and $\mu_n$ measure how much $\Gamma$ is far from being balanced by proving that \begin{align*}\mu_n(\Gamma)&\leq\min\{\frac{2\epsilon(\Gamma)}{m}, \frac{\nu(\Gamma)}{\nu(\Gamma)+\nu_1(\Gamma)}\},\\ \lambda_n(\Gamma)&\leq \min\{\lambda_1(\Gamma'): \Gamma-\Gamma'\,\,\,{is balanced}\}, \end{align*}where $\nu(\Gamma)$ (resp. $\epsilon(\Gamma)$) denotes the frustration number (resp. the frustration index) of $\Gamma$, that is the minimum number of vertices (resp. edges) to be deleted such that the signed graph is balanced.

APA, Harvard, Vancouver, ISO, and other styles

23

TONAMI, SYUICHI, SYOICHI INAGAKI, KOUKI SUGISHITA, MASAKAZU YASUI, and MAKOTO KURANISHI. "531. Reproducibility of cardiac function index with multicrystal gamma camera." Japanese Journal of Radiological Technology 50, no. 8 (1994): 1446. http://dx.doi.org/10.6009/jjrt.kj00003326330.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Landau, A., M. Esterman, L. Robertson, and W. Prinzmetal. "Gamma band levels index voluntary shifts of attention to faces." Journal of Vision 7, no. 9 (2010): 180. http://dx.doi.org/10.1167/7.9.180.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Figueira, A. R., V. Batel, A. L. Carvalho, T. S. Reis, and G. Pinto. "IMRT GAMMA INDEX ANALISYS: A COMPARISON BETWEEN DIFFERENT COMMERCIAL SYSTEMS." Radiotherapy and Oncology 92 (August 2009): S203—S204. http://dx.doi.org/10.1016/s0167-8140(12)73132-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Ma, Sun Young, Ji Hoon Choi, Tae Sig Jeung, and Sangwook Lim. "Quantitative Evaluation of Gated Radiation Therapy Using Gamma Index Analysis." Progress in Medical Physics 24, no. 3 (2013): 198. http://dx.doi.org/10.14316/pmp.2013.24.3.198.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Ceberg, Crister. "A note on the interpretation of the gamma evaluation index." Journal of Physics: Conference Series 444 (June 26, 2013): 012082. http://dx.doi.org/10.1088/1742-6596/444/1/012082.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Clark, C. J., H. J. Pletsch, J. Wu, et al. "THE BRAKING INDEX OF A RADIO-QUIET GAMMA-RAY PULSAR." Astrophysical Journal 832, no. 1 (2016): L15. http://dx.doi.org/10.3847/2041-8205/832/1/l15.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Harding, Alice K. "Gamma-Ray Pulsar Emission Models." International Astronomical Union Colloquium 160 (1996): 315–22. http://dx.doi.org/10.1017/s0252921100041804.

Full text

Abstract:

AbstractWith the increased sensitivity of gamma-ray detectors on the Compton Gamma-Ray Observatory (CGRO) the number of presently known gamma-ray pulsars has grown. The new detections are beginning to provide clues to the origin of the high-energy radiation in the form of emerging patterns and correlations among observed quantities such as gamma-ray efficiency and spectral index vs. age. But there are still many questions about the location of the emission and its relation to the radio, optical and X-ray pulses. This paper will review models for gamma-ray emission from pulsars and will examine how well the detailed predictions of these models account for the existing observations.

APA, Harvard, Vancouver, ISO, and other styles

30

Sharda, Piyush, Mark R. Krumholz, and Christoph Federrath. "The role of the H2 adiabatic index in the formation of the first stars." Monthly Notices of the Royal Astronomical Society 490, no. 1 (2019): 513–26. http://dx.doi.org/10.1093/mnras/stz2618.

Full text

Abstract:

ABSTRACT The adiabatic index of H$_2\,$ ($\gamma _{\mathrm{H_2}}$) is non-constant at temperatures between $100{\,\rm{and}\,}10^4\, \mathrm{K}$ due to the large energy spacing between its rotational and vibrational modes. For the formation of the first stars at redshifts 20 and above, this variation can be significant because primordial molecular clouds are in this temperature range due to the absence of efficient cooling by dust and metals. We study the possible importance of variations in $\gamma _{\mathrm{H_2}}$ for the primordial initial mass function by carrying out 80 3D gravitohydrodynamic simulations of collapsing clouds with different random turbulent velocity fields, half using fixed $\gamma _{\rm H_2} = 7/5$ in the limit of classical diatomic gas (used in earlier works) and half using an accurate quantum mechanical treatment of $\gamma _{\mathrm{H_2}}$. We use the adaptive mesh refinement code flash with the primordial chemistry network from KROME for this study. The simulation suite produces almost 400 stars, with masses from 0.02 to 50 M⊙ (mean mass ${\sim}10.5\, \mathrm{M_{\odot }}$ and mean multiplicity fraction ∼0.4). While the results of individual simulations do differ when we change our treatment of $\gamma _{\mathrm{H_2}}$, we find no statistically significant differences in the overall mass or multiplicity distributions of the stars formed in the two sets of runs. We conclude that, at least prior to the onset of radiation feedback, approximating H2 as a classical diatomic gas with $\gamma _{\rm H_2} = 7/5$ does not induce significant errors in simulations of the fragmentation of primordial gas. None the less, we recommend using the accurate formulation of the H$_2\,$ adiabatic index in primordial star formation studies since it is not computationally more expensive and provides a better treatment of the thermodynamics.

APA, Harvard, Vancouver, ISO, and other styles

31

French, C. A., R. P. Tracy, R. A. Rudick, A. M. Kraemer, and D. A. Arvan. "Simultaneous determination of cerebrospinal fluid oligoclonal bands and the "gamma-protein index" by agarose electrophoresis and densitometry." Clinical Chemistry 32, no. 1 (1986): 84–87. http://dx.doi.org/10.1093/clinchem/32.1.84.

Full text

Abstract:

Abstract Oligoclonal bands were identified in electropherograms of cerebrospinal fluid, and the "gamma-protein index" was concurrently calculated from the same strip. For the index, an upper limit of normal of 0.66 was established. We compared results with the clinical diagnosis in 69 patients with multiple sclerosis and 48 control patients with other diseases. Sensitivity, specificity, and positive predictive values of 73%, 96%, and 96%, respectively, were obtained from the index. An abnormal index and the presence of oligoclonal bands combined increased the positive predictive value to 100%. This approach may allow adequate qualitative and quantitative assessment of gamma-globulin abnormalities in cerebrospinal fluid after a single laboratory procedure.

APA, Harvard, Vancouver, ISO, and other styles

32

Singal, J., A. Ko, and V. Petrosian. "GAMMA-RAY LUMINOSITY AND PHOTON INDEX EVOLUTION OF FSRQ BLAZARS AND CONTRIBUTION TO THE GAMMA-RAY BACKGROUND." Astrophysical Journal 786, no. 2 (2014): 109. http://dx.doi.org/10.1088/0004-637x/786/2/109.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Lin, Min. "EXPERIMENTAL RESEARCH ON FORECASTING INDEX OF BIOLOGICAL IMAGE AEROBIC EXERCISE ANALYSIS OF ARTIFICIAL NEURAL NETWORK." Revista Brasileira de Medicina do Esporte 27, no. 4 (2021): 405–9. http://dx.doi.org/10.1590/1517-8692202127042021_0116.

Full text

Abstract:

ABSTRACT Objective: The paper uses artificial neural network images to explore the effects of aerobic exercise on the gamma rhythm of theta period in the awake hippocampal CA1 area of APP/PS1/tau mice and the low-frequency gamma rhythm of the sleep state hippocampal CA1 area SWR period. Methods: Clean grade 6-month-old APP/PS1/tau mice were randomly divided into quiet group (AS) and exercise group (AE), C57BL/6J control group mice were randomly divided into quiet group (CS) and exercise group (CE). The AE group and the CE group performed 12-week treadmill exercise, 5d/week, 60min/d, the first 10min exercise load was 12m/min, the last 50min was 15m/min treadmill slope was 0°. Eight-arm maze detection of behavioral changes in mice; multi-channel in vivo recording technology to record the electrical signals of the awake state and sleep state in the hippocampal CA1 area, MATLAB extracts the awake state theta period and sleep state SWR period, multi-window spectrum estimation method Perform time-frequency analysis and power spectral density analysis. Results: 12 weeks of aerobic exercise can significantly improve the working memory and reference memory of the AS group, increase the gamma energy in theta period of the awake hippocampus CA1 area and the low-frequency gamma energy in the sleep state CA1 area SWR period. Conclusions: Aerobic exercise can improve the neural network state of the AD model and increase the gamma energy in theta period of the hippocampus CA1 area, and the low-frequency gamma energy in the SWR period is one of the neural network mechanisms for its overall behavioral improvement. Level of evidence II; Therapeutic studies - investigation of treatment results.

APA, Harvard, Vancouver, ISO, and other styles

34

MADAN, DILIP B. "MULTIVARIATE DISTRIBUTIONS FOR FINANCIAL RETURNS." International Journal of Theoretical and Applied Finance 23, no. 06 (2020): 2050041. http://dx.doi.org/10.1142/s0219024920500417.

Full text

Abstract:

Multivariate return distributions consistent with bilateral gamma marginals are formulated and termed multivariate bilateral gamma (MBG). Tail probability distances and Wasserstein distances between return data, model simulations and their squares evaluate the model performance. A full Gaussian copula [Formula: see text] is taken as an alternate test model and the MBG delivers a comparatively better performance for equity pairs. The MBG is however inadequate for the S&P 500 index return when paired with the VIX returns. Applying MBG to the S&P 500 the index and regression residuals of VIX on the S&P 500 index return is successful. This model is termed MBGR. The residual taken as an independent bilateral gamma, delivers the model MBGIR. Characteristic function estimations are employed to develop asset-specific VIX levels and their joint returns with the asset return are studied. The CBOE SKEW index is generalized to be asset-specific and triples of returns for the asset, its VIX and its SKEW are studied using all four models and performance statistics. The model MBGR continues to deliver a good performance.

APA, Harvard, Vancouver, ISO, and other styles

35

Sarin, Nikhil, Paul D. Lasky, and Gregory Ashton. "Interpreting the X-ray afterglows of gamma-ray bursts with radiative losses and millisecond magnetars." Monthly Notices of the Royal Astronomical Society 499, no. 4 (2020): 5986–92. http://dx.doi.org/10.1093/mnras/staa3090.

Full text

Abstract:

ABSTRACT The spin-down energy of millisecond magnetars has been invoked to explain X-ray afterglow observations of a significant fraction of short and long gamma-ray bursts. Here, we extend models previously introduced in the literature, incorporating radiative losses with the spin-down of a magnetar central engine through an arbitrary braking index. Combining this with a model for the tail of the prompt emission, we show that our model can better explain the data than millisecond-magnetar models without radiative losses or those that invoke spin-down solely through vacuum dipole radiation. We find that our model predicts a subset of X-ray flares seen in some gamma-ray bursts. We can further explain the diversity of X-ray plateaus by altering the radiative efficiency and measure the braking index of newly born millisecond magnetars. We measure the braking index of GRB061121 as $n=4.85^{+0.11}_{-0.15}$ suggesting the millisecond-magnetar born in this gamma-ray burst spins down predominantly through gravitational-wave emission.

APA, Harvard, Vancouver, ISO, and other styles

36

Kirk, J. G. "Particle Acceleration in Gamma-Ray Bursts." International Astronomical Union Colloquium 192 (2005): 475–82. http://dx.doi.org/10.1017/s0252921100009568.

Full text

Abstract:

SummarySimple kinematic theories of particle acceleration at relativistic shocks lead to the prediction of a high-energy spectral index of −1.1 for the energy flux of synchrotron photons. However, several effects can change this picture. In this paper I discuss the effect of magnetic field generation at the shock front and, by analogy with the Crab Nebula, suggest that an intrinsic break in the injection spectrum should be expected where the electron gyro radius is comparable to that of protons thermalized by the shock.

APA, Harvard, Vancouver, ISO, and other styles

37

Alves, Carlos, and Jorge Sanjurjo-Sánchez. "An Overview of Radiological Hazards Related to Geological External Gamma Radiation in Outdoor Environments." Proceedings 2, no. 10 (2018): 562. http://dx.doi.org/10.3390/iecg_2018-05337.

Full text

Abstract:

Rocks and soils are an important source of external gamma radiation due to their content in U, Th, and K. The dose rate derived from the emission of gamma-rays of radioisotopes can be directly measured or assessed from their content. In the present study, values of outdoor gamma radiation absorbed dose rate are analyzed to explore the implications of levels related to those values in terms of the exposure time necessary for attaining a certain yearly effective dose. We propose simple relations with the absorbed dose rate and with the gamma index of materials.

APA, Harvard, Vancouver, ISO, and other styles

38

Marcu, Delia, and Constantin Cosma. "effect of gamma irradiation on the germination and growth of Turda Star maize hybrid dry samples." Acta Agraria Debreceniensis, no. I (October 5, 2010): 23–25. http://dx.doi.org/10.34101/actaagrar/i/8368.

Full text

Abstract:

In order to study the effects of gamma rays on germination indices i.e. germination index (GI), total germination (GT) and thegermination energy (GE), of maize hybrid, Turda Star current experiment was conducted. Dry seeds of Turda Star maize hybrid wereirradiated with 2, 5, 15, 30 and 50 Gy, using a 60Co-gamma radiation source.Results showed that gamma irradiation affected all the above mentioned parameters except germination percentage. Totalgermination and germination energy was significantly affected at higher doses of gamma rays. However, increasing doses of gammarays did not have significant effects on seed germination percentage. The other growth parameters showed declining tendency withincreasing doses of gamma irradiation.

APA, Harvard, Vancouver, ISO, and other styles

39

Aissani, Charles, Jacques Martinerie, Lydia Yahia-Cherif, Anne-Lise Paradis, and Jean Lorenceau. "Beta, but Not Gamma, Band Oscillations Index Visual Form-Motion Integration." PLoS ONE 9, no. 4 (2014): e95541. http://dx.doi.org/10.1371/journal.pone.0095541.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Chang, Yuan-Jen, Jing-Quan Lin, Bor-Tsung Hsieh, Chun-Hsu Yao, and Chin-Hsing Chen. "Dose evaluation of an NIPAM polymer gel dosimeter using gamma index." Radiation Physics and Chemistry 104 (November 2014): 180–87. http://dx.doi.org/10.1016/j.radphyschem.2013.11.031.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Yang, Y., N. L. Gagne, C. S. Melhus, and M. J. Rivard. "PO-355 BRACHYTHERAPY DATASET QUALITY ASSURANCE USING THE GAMMA-INDEX METHOD." Radiotherapy and Oncology 103 (May 2012): S143. http://dx.doi.org/10.1016/s0167-8140(12)72321-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Rousseau, A. F., N. Sabourdin, P. Richard, D. Ledoux, P. Damas, and I. Constant. "Clinical sedation and bispectral index in burn children receiving gamma-hydroxybutyrate." European Journal of Anaesthesiology 28 (June 2011): 151. http://dx.doi.org/10.1097/00003643-201106001-00483.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Zhai, Yongjun, X. Jin, D. Giantsoudi, W. He, C. Shi, and N. Papanikolaou. "SU-FF-T-521: Experimental Verification of Biological Gamma Plus Index." Medical Physics 36, no. 6Part17 (2009): 2643. http://dx.doi.org/10.1118/1.3182019.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Rousseau, Anne-Françoise, Didier Ledoux, Nada Sabourdin, Patrick Richard, Pierre Damas, and Isabelle Constant. "Clinical sedation and bispectral index in burn children receiving gamma-hydroxybutyrate." Pediatric Anesthesia 22, no. 8 (2011): 799–804. http://dx.doi.org/10.1111/j.1460-9592.2011.03756.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Daeppen, Jean-Bernard, Tom L. Smith, and Marc A. Schuckit. "Influence of Age and Body Mass Index on gamma-Glutamyltransferase Activity." Alcoholism: Clinical & Experimental Research 22, no. 4 (1998): 941. http://dx.doi.org/10.1097/00000374-199806000-00027.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Tenhunen, M., J. Pyykkönen, M. Tenhunen-Eskelinen, K. Jaatinen, and J. T. Kuikka. "Components of the flood-field uniformity index in a gamma camera." Physics in Medicine and Biology 41, no. 7 (1996): 1209–16. http://dx.doi.org/10.1088/0031-9155/41/7/009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Negri, A., A. Scaggion, M. A. Rossato, D. Canonico, R. Zandonà, and M. Paiusco. "Evaluation of a phantom related gamma index threshold for VMAT QA." Physica Medica 30 (2014): e70. http://dx.doi.org/10.1016/j.ejmp.2014.07.212.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Theodoros, Paschalis, Patatoukas Georgios, Silivridou Katerina, Spyrakos Michalis, and Armpilia Christina. "Gamma index variation in the verification of step & shoot IMRT." Physica Medica 32 (September 2016): 300. http://dx.doi.org/10.1016/j.ejmp.2016.07.144.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Henríquez, Francisco Cutanda, and Silvia Vargas Castrillón. "Gamma index based criterion for the characterization of dosimetrically matched beams." Physica Medica 42 (October 2017): 355. http://dx.doi.org/10.1016/j.ejmp.2017.05.014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

de Almeida, Marcello Henrique, Pedro Luiz Ramos, Gadde Srinivasa Rao, and Fernando Antonio Moala. "Objective Bayesian inference for the capability index of the Gamma distribution." Quality and Reliability Engineering International 37, no. 5 (2021): 2235–47. http://dx.doi.org/10.1002/qre.2854.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Index gamma'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles