Journal articles on the topic 'Rho parameter'
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Sun, Bao-Dong, and Yu-Bing Dong. "${\rm{\rho }}$ meson impact parameter distributions." Chinese Physics C 42, no. 6 (May 2018): 063104. http://dx.doi.org/10.1088/1674-1137/42/6/063104.
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Ezhela, V. V., V. A. Petrov, and N. P. Tkachenko. "Totem: on the Parameter $$\rho$$ at 13 TeV." Physics of Atomic Nuclei 84, no. 3 (May 2021): 298–313. http://dx.doi.org/10.1134/s1063778821020071.
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Pamungkas, Alvian Yogi, Mohammad Syamsu Rosid, and Mochammad Wahdanadi Haidar. "Identification of Hydrocarbon Gas and Discriminate CO2 Using Lame Parameter and Batzle-Wang Model." E3S Web of Conferences 125 (2019): 15003. http://dx.doi.org/10.1051/e3sconf/201912515003.
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Drilling activities in 2016 were carried out at 34 points with only achieving a success ratio of 26%. It affects the decreasing in natural gas reserves. In addition, the presence of CO2 raises problems during production and environmental problems. So, it is necessary to identify hydrocarbon gas and to discriminate CO2. The method used for gas identification is the Lame parameter where the parameters can distinguish the effects caused by lithology and fluid. The Batzle-Wang model is applied to distinguish between hydrocarbon gases and CO2 gas by estimating the fluid’s properties of CO2 gas. Based on the analysis of result the parameters Lambda-Rho and Mu-Rho, both parameters can distinguish the lithology and identify the hydrocarbon fluid content. The area around the C4 is indicated hydrocarbon in 9930 - 10000 ft depth with Lambda-Rho 30 – 31.79 GPa*g/cc and Mu-Rho 27 – 43 GPa*g/cc. Based on the Batzle-Wang Vp analysis, saturated CO2 gas is vulnerable at 16000-17000 ft/s where it is still in range Vp saturated hydrocarbon gas and distributed around the C4 well based on LMR analysis.
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Setyawan, Dendy. "Hydrocarbon Mapping on Reservoir Carbonate Using AVO Inversion Method." JPSE (Journal of Physical Science and Engineering) 6, no. 1 (May 19, 2021): 19–25. http://dx.doi.org/10.17977/um024v6i12021p019.
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Amplitude Versus Offset (AVO) inversion has been applied for reservoir analysis focused on the horizon carbonate Peutu and Belumai. Simultaneous inversion analysis is used to determine gas anomaly inside carbonate-rocks and it’s spread laterally around target zones. It is based on the fact that small Vpand Vs value changes are going to show the better anomaly to identify reservoir fluid content. The AVO inversion method applies angle gather data as the input and then it is inverted to produce P impedance (Zp) and S impedance (Zs). Zp and Zs are derived to produce Lambda-Rho and Mu-Rho that are sensitive to fluid and lithology. Value of Mu-Rho between 44–65 Gpa gr/cc while value of Lambda-Rho smaller than 10 Gpa gr/cc (for carbonate-rock filled by fluid). This research found that Lambda-Rho is the best parameter to show the existence of hydrocarbon in the case of gas. While Mu-Rho is the best parameter to show the differences in lithology.
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Aryanto, Muhamad Defi, Darsono Darsono, Julikah Julikah, and Humbang Purba. "RESERVOIR CHARACTERIZATION USING SIMULTANEOUS INVERSION TO DELINEATE HYDROCARBON RESERVOIR." Scientific Contributions Oil and Gas 37, no. 3 (February 15, 2022): 185–94. http://dx.doi.org/10.29017/scog.37.3.639.
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Reservoir characterization analysis has been carried out for identifying lithology and Àuid content on TalangAkarFormation in South Sumatra Basin. Robust method that being used in this study is the simultaneous inversion which uses pre-stack gather and well log data from Puja A and Puja B. Elastic parameters resulted from simultaneous inversion are P Impedance, S Impedance and V / V ratio. Lambda-Rho parameter (lr) and Mu-Rho (mr) derived from P impedance (I ) and S impedance (I ). Lambda-Rho is sensitive to Àuid content while Mu-Rho to lithology. Area of interest in this study is Talang Akar Formation as reservoir which contains gas with Lambda-Rho (lr) between 5-15 (GPa*g/cc) and Mu-Rho (mr) 35-45 (GPa*g/cc). The ratio of P wave (Vp) and S wave (Vs) can be used as an indicator to determine Àuid saturation. Gas saturated rock has value of Vp / Vs lower than the water saturated rock. In this study, the ratio of Vp / Vs is 1.5-1.7 for gas saturated rock
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Bartoš, E., S. Dubnička, A. Z. Dubničková, M. Fujikawa, and H. Hayashii. "Parameter differences of the charged and neutral rho-meson family." Nuclear Physics B - Proceedings Supplements 198, no. 1 (January 2010): 186–89. http://dx.doi.org/10.1016/j.nuclphysbps.2009.12.036.
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PATRA, S. K., and C. R. PRAHARAJ. "RHO-MESON-NUCLEON COUPLING IN RELATIVISTIC MEAN FIELD THEORY." Modern Physics Letters A 06, no. 35 (November 20, 1991): 3213–19. http://dx.doi.org/10.1142/s0217732391003705.
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We obtain a more accurate rho-meson-nucleon coupling constant gρ for studying nuclei in relativistic mean field theory of nucleons and mesons than used before. With this gρ we get a better description of finite nuclei. We have studied a number of isotopic chains of neutron-rich nuclei using the new gρ parameter, with important consequences for very neutron-rich exotic nuclei and the neutron-drip line. The binding energies are sensitive to the coupling constant gρ, but the rms radii and deformation parameters of nuclei are not at all sensitive to gρ.
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Besse, Adrien, Lech Szymanowski, and Samuel Wallon. "High Energy Rho Meson Leptoproduction §." Open Physics Journal 1, no. 1 (December 31, 2014): 33–35. http://dx.doi.org/10.2174/1874843001401010033.
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We investigate the longitudinal and transverse polarized cross-sections of the leptoproduction of the ρ meson in the high energy limit. Our model is based on the computation of the impact factor γ*(λγ)→ ρ (λρ) using the twist expansion in the forward limit which is expressed in the impact parameter space. This treatment involves in the final stage the twist 2 and twist 3 distribution amplitudes (DAs) of the ρ meson and the dipole scattering amplitude. Taking models that exist for the DAs and for the dipole cross-section. We get a phenomenological model for the helicity amplitudes. We compare our predictions with HERA data and get a fairly good description for large enough virtualities of the photon. PACS number(s): 13.60.Le, 12.39.St, 12.38.Bx.
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Passarino, Giampiero. "Radiative corrections to the rho parameter versus the top quark mass." Physics Letters B 247, no. 4 (September 1990): 587–92. http://dx.doi.org/10.1016/0370-2693(90)91906-r.
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Hai, XuRan, and ShuHong Wang. "Hermite-Hadamard type inequalities based on the Erdélyi-Kober fractional integrals." AIMS Mathematics 6, no. 10 (2021): 11494–507. http://dx.doi.org/10.3934/math.2021666.
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<abstract><p>In the paper, based on Erdélyi-Kober fractional integrals $ ^\rho \mathcal{K}^\alpha_{\chi+}f $ and $ ^\rho \mathcal{K}^\alpha_{\chi-}f $ for any $ \chi\in[a, b] $ with $ f\in\mathfrak{X}_c^p(a, b) $, authors establish some new Hermite-Hadamard type inequalities for convex function. The obtained inequalities generalize the corresponding results for Riemann-Liouville fractional integrals by taking limits when a parameter $ \rho\rightarrow1 $. As applications, the error estimations of Hermite-Hadamard type inequality are also provided.</p></abstract>
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Dominguez, C. A., M. Loewe, and M. Lushozi. "Scalar Form Factor of the Pion in the Kroll-Lee-Zumino Field Theory." Advances in High Energy Physics 2015 (2015): 1–4. http://dx.doi.org/10.1155/2015/803232.
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The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral rho-meson is used to determine the scalar form factor of the pion in the space-like region at next-to-leading order. Perturbative calculations in this framework are parameter-free, as the masses and the rho-pion-pion coupling are known from experiment. Results compare favorably with lattice QCD calculations.
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Wu, Cunzhi, Lei Han, Feng Zhang, Junzhou Liu, Haifeng Chen, and Bangrang Di. "Gas hydrate reservoir identification based on rock physics modelling and sensitive elastic parameters." Journal of Geophysics and Engineering 20, no. 1 (January 18, 2023): 117–27. http://dx.doi.org/10.1093/jge/gxac100.
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Abstract Seismic bottom simulating reflections (BSR) analysis and seismic inversion are commonly used for gas hydrate reservoir interpretation. The relationship between gas hydrate saturation and elastic parameters can be influenced by gas hydrate occurrence state (e.g. pore-filling type gas hydrate or load-bearing type gas hydrate), and this may cause inaccurate interpretation. We first used the simplified three-phase Biot equation (STPBE) to model a formation containing two types of gas hydrate at the same time. Then the effects of occurrence state and authigenic minerals on the relationship between saturation and varied elastic parameters are analysed. Results show that bulk modulus (K), shear modulus ($\mu $), P-wave velocity (${V}_p$), S-wave velocity (${V}_s$), velocity ratio (${V}_p/{V}_s$), Poisson's ratio (v) and $\mu \rho $ increase at different rates with gas hydrate saturation, ${V}_p/{V}_s$ and v show relative higher sensitivity to occurrence state. Ratios of elastic parameter increments are further used to highlight the anomalies caused by gas hydrate. Four attributes ($\Delta K/\Delta \mu $, $\Delta {V}_p/\Delta {V}_s$, $\Delta ({V}_p/{V}_s)/\Delta \nu $ and $\Delta \lambda \rho /\Delta \mu \rho $) show good sensitivity to both gas hydrate saturation and occurrence state. $\Delta ({V}_p/{V}_s)/\Delta \nu $ and $\Delta \lambda \rho /\Delta \mu \rho $ can be used to distinguish gas hydrate with varied occurrence states from authigenic minerals (limestone, opal, pyrite and others). Two selected sensitive attributes $\Delta ({V}_p/{V}_s)/\Delta \nu $ and $\Delta \lambda \rho /\Delta \mu \rho $ are applied to well logs, four gas hydrate-bearing intervals in well 2L-38 from Mallik permafrost area in Canada and one gas hydrate-bearing interval in well A from Shenhu area in South China Sea are identified. These results are consistent with the interpreted result from the resistivity log using Archie's formula. This investigation may provide effective tools for the seismic interpretation of gas hydrate reservoirs.
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Eroumé, K., A. Vasilevich, S. Vermeulen, J. de Boer, and A. Carlier. "On the influence of cell shape on dynamic reaction-diffusion polarization patterns." PLOS ONE 16, no. 3 (March 18, 2021): e0248293. http://dx.doi.org/10.1371/journal.pone.0248293.
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The distribution of signaling molecules following mechanical or chemical stimulation of a cell defines cell polarization, with regions of high active Cdc42 at the front and low active Cdc42 at the rear. As reaction-diffusion phenomena between signaling molecules, such as Rho GTPases, define the gradient dynamics, we hypothesize that the cell shape influences the maintenance of the “front-to-back” cell polarization patterns. We investigated the influence of cell shape on the Cdc42 patterns using an established computational polarization model. Our simulation results showed that not only cell shape but also Cdc42 and Rho-related (in)activation parameter values affected the distribution of active Cdc42. Despite an initial Cdc42 gradient, the in silico results showed that the maximal Cdc42 concentration shifts in the opposite direction, a phenomenon we propose to call “reverse polarization”. Additional in silico analyses indicated that “reverse polarization” only occurred in a particular parameter value space that resulted in a balance between inactivation and activation of Rho GTPases. Future work should focus on a mathematical description of the underpinnings of reverse polarization, in combination with experimental validation using, for example, dedicated FRET-probes to spatiotemporally track Rho GTPase patterns in migrating cells. In summary, the findings of this study enhance our understanding of the role of cell shape in intracellular signaling.
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Auberson, G., and F. M. Renard. "A rigorous bound on theS-waveWW scattering contribution to the rho parameter." Zeitschrift für Physik C Particles and Fields 55, no. 1 (March 1992): 127–33. http://dx.doi.org/10.1007/bf01558297.
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NANDITA. N, DEVI, KOMANG DHARMAWAN, and DESAK PUTU EKA NILAKUSMAWATI. "ANALISIS SENSITIVITAS HARGA OPSI MENGGUNAKAN METODE GREEK BLACK SCHOLES." E-Jurnal Matematika 7, no. 2 (May 13, 2018): 148. http://dx.doi.org/10.24843/mtk.2018.v07.i02.p197.
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Sensitivity analysis can be used to carry out hedging strategies. The sensitivity value measures how much the price change of the option influenced by some parameters. The aim of this study is to determine the sensitivity analysis of the buying price of European option by using the Greek method on Black Scholes Formula. From this study we get the values of delta, gamma, theta, vega, and rho. The values of deltas, gamma, vega, and rho are positive, which means that the value of the option is more sensitive than the corresponding parameter. The most sensitive value of gamma is obtained when the stock price approaches the strike price and approaches the expiry date. The value of theta obtained is negative and hence the most sensitive theta value is when the value is getting smaller. While, the most sensitive value of vega is obtained when the stock price is close to the strike price and is far from the expiry date. The most sensitive value of rho is obtained when the stock price gets bigger and farther from the expiry date.
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Prohic, Nejra, Halima Resic, Goce Spasovski, Fahrudin Masnic, Amela Beciragic, Jelka Masin Spasovska, and Aida Coric. "Correlation of B-type Natriuretic Peptide (BNP) with Left Ventricle Systolic Function Echocardiographic Parameters in Patients with Chronic Kidney Disease (CKD)." BANTAO Journal 12, no. 2 (December 1, 2014): 108–13. http://dx.doi.org/10.2478/bj-2014-0021.
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Abstract Introduction. BNP plasma levels are significantly increased in heart failure and have an excellent negative predictive value for left ventricular dysfunction. Measurement of BNP level is useful for “screening” in high-risk populations. It is suitable for detection of left ventricular hypertrophy (LVH) and/or dysfunction and risk assessment in the sub-acute phase of acute myocardial infarction in hypertensive patients. The aim of our study was to find whether BNP may correlate with the left ventricular systolic function, i.e. its echocardiographic parameters in chronic kidney disease (CKD) patients. Methods. In a prospective study performed at the Department of Nephrology and Clinic for hemodialysis at the Clinical Center in Sarajevo we followed-up 80 patients stratified in three separate groups according to CKD stage (Stage III, IV and V) for two years, regardless of their cardiovascular symptoms. We analyzed levels of BNP before and after diuretic therapy or hemodialysis and echocardiographic characteristics of the left ventricle. Results. There was a strong negative correlation between BNP values and the size of the EF before (rho=−0.692, p<0.0001) and after diuretic therapy (rho=−0.683, p<0.0001) for patients in CKD stage III, stage IV (rho=−0.314, p>0.05) and after diuretic therapy (rho=−495, p<0.05) Similarly, a negative correlation was found for BNP and EF values before (rho=−0.432, p<0.05) and after hemodialysis (rho=−0.556, p<0.01) for stage V CKD. Conclusions. Our study confirmed that the value of BNP in CKD patients may represent a measure of left ventricular systolic function with a strong negative correlation with ejection fraction. BNP measurement is a reliable parameter for further follow-up and prognosis in patients with established left ventricular dysfunction, acute coronary syndrome and for estimation of the left ventricular dysfunction.
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Hong, Qing, Guozhen Lu, and Lu Zhang. "L p boundedness of rough bi-parameter Fourier integral operators." Forum Mathematicum 30, no. 1 (January 1, 2018): 87–107. http://dx.doi.org/10.1515/forum-2016-0221.
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Abstract In this paper, we will investigate the boundedness of the bi-parameter Fourier integral operators (or FIOs for short) of the following form: T(f\/)(x)=\frac{1}{(2\pi)^{2n}}\int_{\mathbb{R}^{2n}}e^{i\varphi(x,\xi,\eta)}% \cdot a(x,\xi,\eta)\cdot\widehat{f}(\xi,\eta)\,d\xi\,d\eta, where {x=(x_{1},x_{2})\in\mathbb{R}^{n}\times\mathbb{R}^{n}} and {\xi,\eta\in\mathbb{R}^{n}\setminus\{0\}} , {a(x,\xi,\eta)\in L^{\infty}BS^{m}_{\rho}} is the amplitude, and the phase function is of the form \varphi(x,\xi,\eta)=\varphi_{1}(x_{1},\xi\/)+\varphi_{2}(x_{2},\eta) , with \varphi_{1},\varphi_{2}\in L^{\infty}\Phi^{2}(\mathbb{R}^{n}\times\mathbb{R}^{% n}\setminus\{0\}) , and satisfies a certain rough non-degeneracy condition (see (2.2)). The study of these operators are motivated by the {L^{p}} estimates for one-parameter FIOs and bi-parameter Fourier multipliers and pseudo-differential operators. We will first define the bi-parameter FIOs and then study the {L^{p}} boundedness of such operators when their phase functions have compact support in frequency variables with certain necessary non-degeneracy conditions. We will then establish the {L^{p}} boundedness of the more general FIOs with amplitude {a(x,\xi,\eta)\in L^{\infty}BS^{m}_{\rho}} and non-smooth phase function {\varphi(x,\xi,\eta)} on x satisfying a rough non-degeneracy condition.
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Widodo, A., W. Lestari, D. D. Warnana, F. Syaifuddin, R. S. Rivensky, and R. Z. Ilmawan. "Analysis of the effect of magnetotelluric data quality improvement using rho variance and edit XPR parameters in densely populated areas." IOP Conference Series: Earth and Environmental Science 851, no. 1 (October 1, 2021): 012003. http://dx.doi.org/10.1088/1755-1315/851/1/012003.
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Abstract Magnetotelluric (MT) research was conducted to map the fault structure in the western part of East Java. The advantage of the magnetotelluric method is its deep penetration because it propagates at a low frequency so that it can detect resistivity anomalies that are thought to be faults. The measuring path of the magnetotelluric method covered the Surabaya and Gresik areas. Research conducted in densely populated areas thus it requires a noise reduction process to improve the quality of the data. Performing the robust processing with Rho Variance parameters and editing XPR is an effort to reduce noise and to improve the quality of magnetotelluric data. The robust processing result of 5 (five) sounding MT data using the Rho Variance parameter can improve the quality of magnetotelluric data by increasing the coherence value of 2.128% (MT01), 2.804% (MT02), 2.378% (MT03), 3.508% (MT04), and 3.129% (MT12). Meanwhile, the editing XPR process can increase the coherence value of 0.184% (MT01), 7.155% (MT02), 9,364% (MT03), 0.784% (MT04), and 0.628% (MT12). Escalation of coherence value by implemented the Rho Variance and Editing XPR means that two methods are sufficient effectively to raise the confidence level of MT data processing and interpretation result.
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Kumaran, V., and S. Pradhan. "The generalized Onsager model for a binary gas mixture." Journal of Fluid Mechanics 753 (July 23, 2014): 307–59. http://dx.doi.org/10.1017/jfm.2014.365.
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AbstractThe Onsager model for the secondary flow field in a high-speed rotating cylinder is extended to incorporate the difference in mass of the two species in a binary gas mixture. The base flow is an isothermal solid-body rotation in which there is a balance between the radial pressure gradient and the centrifugal force density for each species. Explicit expressions for the radial variation of the pressure, mass/mole fractions, and from these the radial variation of the viscosity, thermal conductivity and diffusion coefficient, are derived, and these are used in the computation of the secondary flow. For the secondary flow, the mass, momentum and energy equations in axisymmetric coordinates are expanded in an asymptotic series in a parameter $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}\epsilon = (\Delta m/ m_{av})$, where $\Delta m$ is the difference in the molecular masses of the two species, and the average molecular mass $m_{av}$ is defined as $m_{av}= (\rho _{w1} m_1 + \rho _{w2} m_2)/\rho _w$, where $\rho _{w1}$ and $\rho _{w2}$ are the mass densities of the two species at the wall, and $\rho _w = \rho _{w1} + \rho _{w2}$. The equation for the master potential and the boundary conditions are derived correct to $O(\epsilon ^2)$. The leading-order equation for the master potential contains a self-adjoint sixth-order operator in the radial direction, which is different from the generalized Onsager model (Pradhan & Kumaran, J. Fluid Mech., vol. 686, 2011, pp. 109–159), since the species mass difference is included in the computation of the density, viscosity and thermal conductivity in the base state. This is solved, subject to boundary conditions, to obtain the leading approximation for the secondary flow, followed by a solution of the diffusion equation for the leading correction to the species mole fractions. The $O(\epsilon )$ and $O(\epsilon ^2)$ equations contain inhomogeneous terms that depend on the lower-order solutions, and these are solved in a hierarchical manner to obtain the $O(\epsilon )$ and $O(\epsilon ^2)$ corrections to the master potential. A similar hierarchical procedure is used for the Carrier–Maslen model for the end-cap secondary flow. The results of the Onsager hierarchy, up to $O(\epsilon ^2)$, are compared with the results of direct simulation Monte Carlo simulations for a binary hard-sphere gas mixture for secondary flow due to a wall temperature gradient, inflow/outflow of gas along the axis, as well as mass and momentum sources in the flow. There is excellent agreement between the solutions for the secondary flow correct to $O(\epsilon ^2)$ and the simulations, to within 15 %, even at a Reynolds number as low as 100, and length/diameter ratio as low as 2, for a low stratification parameter $\mathcal{A}$ of 0.707, and when the secondary flow velocity is as high as 0.2 times the maximum base flow velocity, and the ratio $2 \Delta m / (m_1 + m_2)$ is as high as 0.5. Here, the Reynolds number $\mathit{Re}= \rho _w \varOmega R^2 / \mu $, the stratification parameter $\mathcal{A}= \sqrt{m \varOmega ^2 R^2 / (2k_BT)}$, $R$ and $\varOmega $ are the cylinder radius and angular velocity, $m$ is the molecular mass, $\rho _w$ is the wall density, $\mu $ is the viscosity and $T$ is the temperature. The leading-order solutions do capture the qualitative trends, but are not in quantitative agreement.
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Chattopadhyay, P. K., and B. C. Paul. "Relativistic strange stars with anisotropy and B-parameter in pseudo spheroidal space time." Proceedings of the International Astronomical Union 8, S291 (August 2012): 362–64. http://dx.doi.org/10.1017/s174392131202412x.
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AbstractA class of compact cold stars in the presence of strange matter is obtained for a pseudo-spheroidal geometry. Considering the strange matter equation of state $p = \frac{1}{3}(\rho-4B)$ with pressure anisotropy described by Vaidya-Tikekar metric, we determine the parameter B both inside and on the surface of the star for different values of anisotropy parameter α. In the anisotropic case, we note that a stable model of a compact star may be realized.
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Li, Yongkun, Yunyun Xiong, Qiankun Cai, Dezhi Liu, Qiliang Dai, Wenhua Liu, Zhixin Huang, et al. "Anterior Borderzone Angle for Hemodynamic Collateral Metric in Patients with Symptomatic Middle Cerebral Artery Stenosis." European Neurology 79, no. 1-2 (November 23, 2017): 45–53. http://dx.doi.org/10.1159/000484313.
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Background and Aims: We aimed to introduce a parameter of anterior borderzone angle (ABZA) to quantitatively evaluate the ACA-MCA leptomeningeal collaterals for middle cerebral artery stenosis (MCAS). Methods: Two hundred seventy-five patients with 50–100% MCAS and 100 controls were included. The 95% reference range of ABZA was obtained from the controls. ABZAtrans was defined as “ABZA/the 95% upper limit.” Relationships between ABZA and MCAS, ABZAtrans and the TICI grade, the American Society of Interventional and Therapeutic Neuroradiology/Society of Interventional Radiology (ASITN/SIR) collateral grade were analyzed. An ABZA grade model for the ACA leptomeningeal collaterals was tentatively developed. Results: The 95% reference range of ABZA was 0.0º–23.0º. ABZA was significantly associated with MCAS by a function of the fourth power (R2 = 0.723, p < 0.001), and could predict hemodynamic MCAS (≥70%) with an AUC of 0.928 (95% CI 0.903–0.953). ABZAtrans was negatively correlated with the TICI grade (rho = –0.752, p < 0.001) and positively with the ASITN/SIR grade (rho = 0.921, p < 0.001). The ABZA grade was created by rounding ABZAtrans to a nearest integer, and was closely associated with the ASITN/SIR grade (rho = 0.894, p < 0.001). Conclusions: ABZA can be used as a hemodynamic parameter to quantitatively evaluate ACA leptomeningeal collaterals.
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Espinosa-Gayosso, Alexis, Marco Ghisalberti, Gregory N. Ivey, and Nicole L. Jones. "Density-ratio effects on the capture of suspended particles in aquatic systems." Journal of Fluid Mechanics 783 (October 15, 2015): 191–210. http://dx.doi.org/10.1017/jfm.2015.557.
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Particle capture, whereby suspended particles contact and adhere to a solid surface (a ‘collector’), is important in a range of environmental processes, including suspension feeding by corals and ‘filtering’ by aquatic vegetation. Although aquatic particles are often considered as perfect tracers when estimating capture efficiency, the particle density ratio (${\it\rho}^{+}$) – the ratio of the particle density to the fluid density – can significantly affect capture. In this paper, we use a numerical analysis of particle trajectories to quantify the influence of ${\it\rho}^{+}$ on particle capture by circular collectors in a parameter space relevant to aquatic systems. As it is generally believed that inertia augments the capture efficiency when the Stokes number ($\mathit{St}$) of the particles exceeds a critical value, we first estimate the critical Stokes number for aquatic-type particles and demonstrate its dependence on both ${\it\rho}^{+}$ and the Reynolds number ($\mathit{Re}$). Second, we analyse how efficiently circular collectors can capture neutrally buoyant (${\it\rho}^{+}=1$), sediment-type (${\it\rho}^{+}=2.6$) and weakly buoyant (${\it\rho}^{+}=0.9$) aquatic particles. Our analysis shows that, for ${\it\rho}^{+}>1$, inertia can either augment or diminish capture efficiency, and inertial effects appear well before the critical Stokes number is reached. The role of particle inertia is maximised at Stokes numbers above the critical value and, for sediment-type particles, can result in as much as a fourfold increase in the rate of capture relative to perfect tracers of the same size. Similar but opposite effects are observed for weakly buoyant particles, where capture efficiency can decrease by 60 % relative to the capture of perfect tracers.
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Boughezal, R., J. B. Tausk, and J. J. van der Bij. "Three-loop electroweak correction to the rho parameter in the large Higgs mass limit." Nuclear Physics B 713, no. 1-3 (May 2005): 278–90. http://dx.doi.org/10.1016/j.nuclphysb.2005.02.020.
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Bauer, E., T. Gutsche, A. Muhm, R. Thierauf, Y. Yan, Amand Faessler, and R. Vinh Mau. "The rho parameter of low energy proton-antiproton scattering in the 3P0 quark model." Physics Letters B 386, no. 1-4 (October 1996): 50–54. http://dx.doi.org/10.1016/0370-2693(96)00974-4.
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Ng, Ying Zhuang, Lee Lee Lai, Sui Weng Wong, Siti Yatimah Mohamad, Kee Huat Chuah, and Wah Kheong Chan. "Attenuation parameter and liver stiffness measurement using FibroTouch vs Fibroscan in patients with chronic liver disease." PLOS ONE 16, no. 5 (May 3, 2021): e0250300. http://dx.doi.org/10.1371/journal.pone.0250300.
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Background & aim We studied FibroTouch (FT) and Fibroscan (FS) examination results and their repeatability when performed by healthcare personnel of different background. Methods FT and FS examinations were performed on patients with chronic liver disease by two operators, a doctor and a nurse, twice on each patient, at two different time points, independent of each other. Results The data for 163 patients with 1304 examinations was analyzed. There was strong correlation between FT and FS for attenuation parameter (Spearman’s rho 0.76, p<0.001) and liver stiffness measurement (LSM) (Spearman’s rho 0.70, p<0.001). However, FT produced higher value at lower attenuation parameter and LSM, and lower value at higher attenuation parameter and LSM. There was substantial agreement when using 15kPa LSM cut-off, but only moderate agreement when using 10kPa and 20kPa LSM cut-offs and 248dB/m, 268dB/m and 280dB/m attenuation parameter cut-offs. The IQR for attenuation parameter and IQR/median for LSM were significantly lower for FT compared with FS (4dB/m vs 27dB/m, p<0.001, and 10 vs 12, p<0.001, respectively). The intra- and inter-observer reliability of attenuation parameter and LSM using FT and FS were good to excellent with intraclass correlation coefficients 0.89–0.99. FT had shorter examination time (33s vs 47s, p<0.001) and less invalid measurements (0 vs 2, p<0.001). Conclusion Measurements obtained with FT and FS strongly correlated, but significant differences in their absolute values, consistency, examination time and number of invalid measurements were observed. Either device can be used by healthcare personnel of different backgrounds when sufficiently trained.
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Holmes, William R., Adriana E. Golding, William M. Bement, and Leah Edelstein-Keshet. "A mathematical model of GTPase pattern formation during single-cell wound repair." Interface Focus 6, no. 5 (October 6, 2016): 20160032. http://dx.doi.org/10.1098/rsfs.2016.0032.
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Rho GTPases are regulatory proteins whose patterns on the surface of a cell affect cell polarization, cell motility and repair of single-cell wounds. The stereotypical patterns formed by two such proteins, Rho and Cdc42, around laser-injured frog oocytes permit experimental analysis of GTPase activation, inactivation, segregation and crosstalk. Here, we review the development and analysis of a spatial model of GTPase dynamics that describe the formation of concentric zones of Rho and Cdc42 activity around wounds, and describe how this model has provided insights into the roles of the GTPase effector molecules protein kinase C (PKCβ and PKCη) and guanosine nucleotide dissociation inhibitor (GDI) in the wound response. We further demonstrate how the use of a ‘sharp switch’ model approximation in combination with bifurcation analysis can aid mapping the model behaviour in parameter space (approximate results confirmed with numerical simulation methods). Using these methods in combination with experimental manipulation of PKC activity (PKC overexpression (OE) and dominant negative conditions), we have shown that: (i) PKCβ most probably acts by enhancing existing positive feedbacks (from Rho to itself via the guanosine nucleotide exchange factor domain of Abr, and from Cdc42 to itself), (ii) PKCη most probably increases basal rates of inactivation (or possibly decreases basal rates of activation) of Rho and Cdc42, and (iii) the graded distribution of PKCη and its effect on initial Rho activity accounts for inversion of zones in a fraction (20%) of PKCη OE cells. Finally, we speculate that GDIs (which sequester GTPases) may have a critical role in defining the spatial domain, where the wound response may occur. This paper provides a more thorough exposition of the methods of analysis used in the investigation, whereas previous work on this topic was addressed to biologists and abbreviated such discussion.
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Díaz-Cruz, J. L., and D. A. López-Falcón. "Probing the mechanism of EWSB with a rho-parameter defined in terms of Higgs couplings." Physics Letters B 568, no. 3-4 (August 2003): 245–53. http://dx.doi.org/10.1016/j.physletb.2003.06.047.
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Timotius, Hagayudha, and Yulinar Firdaus. "CHARACTERISTIC OF SHALE GAS RESERVOIR USING LMR (LAMBDA-MU-RHO) INVERSION: CASE STUDY BARNETT SHALE, FORT WORTH BASIN TEXAS, USA." BULLETIN OF THE MARINE GEOLOGY 28, no. 1 (February 15, 2016): 43. http://dx.doi.org/10.32693/bomg.28.1.2013.54.
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The decreasing of fossil fuel reserves in the conventional reservoir has made geologists and geophysicists to explore alternative energy source that could answer energy needs in the future. Therefore the exploration of oil and gas that is still trapped in the source rock (shale) is needed, and one of them still developed in shale gas. The method of Amplitude Versus Offset (AVO) Inversion is used for Lambda-Mu-Rho attributes, that is expected to assess values of physical parameters of shale. Fort Worth Basin is chosen to be a study area because, the Barnett Shale Formation has proven contains of oil and gas. This study using synthetic seismic data, based on geological model and well log data obtained from Vermylen (2012). It is expected from the study of Barnett Shale that related to shale gas development could be applied.
Keyword: Shale gas, Barnett Shale, Fort Worth Basin, AVO Inversion, Lambda-mu-rho attributes
Penurunan cadangan bahan bakar fosil pada reservoar konvensional membuat ahli geologi dan geofisika mengeksplorasi sumber energi alternatif guna menjawab kebutuhan energi di masa depan. Oleh karena itu dibutuhkan eksplorasi minyak dan gas yang masih terperangkap dalam batuan induk (serpih), dan salah satunya yang dikembangkan saat ini adalah “shale gasâ€. Penggunaan metode inversi Amplitudo Versus Offset (AVO) untuk atribut Lambda-Mu-Rho diharapkan dapat menghasilkan nilai-nilai parameter “fisis shaleâ€. Cekungan Fort Worth dipilih sebagai lokasi penelitian ini karena terdapat Formasi “Barnett Shale†yang telah terbukti mengandung minyak dan gas. Penelitian ini menggunakan data seismik sintetik berdasarkan model geologi serta data sumur yang diperoleh dari Vermylen (2012). Diharapkan dari penelitian tentang Barnett Shale yang berkaitan dengan pengembangan shale gas dapat diaplikasikan.
Kata kunci: “Shale gasâ€, “Barnett Shaleâ€, Cekungan Fort Worth, Inversi AVO, atribut Lambda-Mu-Rho
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LAWRANCE, ROBERT, and MAURIZIO PIAI. "HOLOGRAPHIC TECHNI-DILATON AND LHC SEARCHES." International Journal of Modern Physics A 28, no. 17 (July 10, 2013): 1350081. http://dx.doi.org/10.1142/s0217751x13500814.
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We analyze in detail the phenomenology of a model of dynamical electroweak symmetry breaking inspired by walking technicolor, by using the techniques of the bottom-up approach to holography. The model admits a light composite scalar state, the dilaton, in the spectrum. We focus on regions of parameter space for which the mass of such dilaton is 125 GeV, and for which the bounds on the precision electroweak parameter S are satisfied. This requires that the next-to-lightest composite state is the techni-rho meson, with a mass larger than 2.3 TeV. We compute the couplings controlling the decay rates of the dilaton to two photons and to two (real or virtual) Z and W bosons. For generic choices of the parameters, we find a suppression of the decay into heavy gauge bosons, in respect to the analog decay of the standard model Higgs. We find a dramatic effect on the decay into photons, which can be both strongly suppressed or strongly enhanced, the latter case corresponding to the large-N regime of the dual theory. There is a correlation between this decay rate of the dilaton into photons and the mass splitting between the techni-rho meson and its axial-vector partner: if the decay is enhanced in respect to the standard model case, then the heavy spin-1 resonances are nearly degenerate in mass, otherwise their separation in mass is comparable to the mass scale itself.
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ZHANG, HUA-MING, SHAO-YI WU, XUE-FENG WANG, and YUE-XIA HU. "THEORETICAL STUDIES OF THE SPIN HAMILTONIAN PARAMETERS AND LOCAL STRUCTURE FOR THE TETRAGONAL Rh2+ CENTER IN RHOMBOHEDRAL BaTiO3." Modern Physics Letters B 23, no. 17 (July 10, 2009): 2115–22. http://dx.doi.org/10.1142/s0217984909020266.
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The spin Hamiltonian parameters and local structure for the tetragonal Rh 2+ center in rhombohedral BaTiO 3 are theoretically studied from the perturbation formulas of these parameters for a 4d 7 ion with low spin (S=1/2) in tetragonally elongated octahedra. This center is ascribed to substitutional Rh 2+ at the Ti 4+ site in BaTiO 3. The [ RhO 6]10- cluster suffers relative elongation (characterized by the elongation parameter ρ ≈ 0.9%) along the [100] axis due to the Jahn–Teller effect. The tetragonal elongation can entirely depress the slight trigonal distortion of the original Ti 4+ site in rhombohedral BaTiO 3. The calculated spin Hamiltonian parameters based on the above Jahn–Teller elongation show good agreement with the experimental results.
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Wrotek, August, Oliwia Wrotek, and Teresa Jackowska. "Platelet Abnormalities in Children with Laboratory-Confirmed Influenza." Diagnostics 13, no. 4 (February 8, 2023): 634. http://dx.doi.org/10.3390/diagnostics13040634.
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Background: The role of platelets in the immune response against influenza has been raised, and a diagnostic or prognostic value of platelet parameter abnormalities, including platelet count (PLT), or mean platelet volume (MPV), has been suggested. The study aimed to analyze the prognostic value of platelet parameters in children hospitalized due to laboratory-confirmed influenza. Methods: We retrospectively verified the platelet parameters (PLT, MPV, MPV/PLT, and PLT/lymphocyte ratio regarding the influenza complications (acute otitis media, pneumonia, and lower respiratory tract infection—LRTI), and the clinical course (antibiotic treatment, tertiary care transfer, and death). Results: An abnormal PLT was observed in 84 out of 489 laboratory-confirmed cases (17.2%, 44 thrombocytopaenia cases, and 40 thrombocytoses). Patients’ age correlated negatively with PLT (rho = −0.46) and positively with MPV/PLT (rho = 0.44), while MPV was not age-dependent. The abnormal PLT correlated with increased odds of complications (OR = 1.67), including LRTI (OR = 1.89). Thrombocytosis was related to increased odds of LRTI (OR = 3.64), and radiologically/ultrasound-confirmed pneumonia (OR = 2.15), mostly in children aged under 1 year (OR = 4.22 and OR = 3.79, respectively). Thrombocytopaenia was related to antibiotic use (OR = 2.41) and longer hospital stays (OR = 3.03). A lowered MPV predicted a tertiary care transfer (AUC = 0.77), while MPV/PLT was the most versatile parameter in predicting LRTI (AUC = 0.7 in < 1 yo), pneumonia (AUC = 0.68 in < 1 yo), and antibiotic treatment (AUC = 0.66 in 1–2 yo and AUC = 0.6 in 2–5 yo). Conclusions: Platelet parameters, including PLT count abnormalities and MPV/PLT ratio, are related to the increased odds of complications and a more severe disease course, and may add important data in assessing pediatric influenza patients, but should be interpreted cautiously due to age-related specificities.
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He, Haiyang. "Nonlinear Choquard equations on hyperbolic space." Opuscula Mathematica 42, no. 5 (2022): 691–708. http://dx.doi.org/10.7494/opmath.2022.42.5.691.
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In this paper, our purpose is to prove the existence results for the following nonlinear Choquard equation \[-\Delta_{\mathbb{B}^{N}}u=\int_{\mathbb{B}^N}\dfrac{|u(y)|^{p}}{|2\sinh\frac{\rho(T_y(x))}{2}|^\mu} dV_y \cdot |u|^{p-2}u +\lambda u\] on the hyperbolic space \(\mathbb{B}^N\), where \(\Delta_{\mathbb{B}^{N}}\) denotes the Laplace-Beltrami operator on \(\mathbb{B}^N\), \[\sinh\frac{\rho(T_y(x))}{2}=\dfrac{|T_y(x)|}{\sqrt{1-|T_y(x)|^2}}=\dfrac{|x-y|}{\sqrt{(1-|x|^2)(1-|y|^2)}},\] \(\lambda\) is a real parameter, \(0\lt \mu\lt N\), \(1\lt p\leq 2_\mu^*\), \(N\geq 3\) and \(2_\mu^*:=\frac{2N-\mu}{N-2}\) is the critical exponent in the sense of the Hardy-Littlewood-Sobolev inequality.
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Riani, Marco, Anthony C. Atkinson, Aldo Corbellini, and Domenico Perrotta. "Robust Regression with Density Power Divergence: Theory, Comparisons, and Data Analysis." Entropy 22, no. 4 (March 31, 2020): 399. http://dx.doi.org/10.3390/e22040399.
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Minimum density power divergence estimation provides a general framework for robust statistics, depending on a parameter α , which determines the robustness properties of the method. The usual estimation method is numerical minimization of the power divergence. The paper considers the special case of linear regression. We developed an alternative estimation procedure using the methods of S-estimation. The rho function so obtained is proportional to one minus a suitably scaled normal density raised to the power α . We used the theory of S-estimation to determine the asymptotic efficiency and breakdown point for this new form of S-estimation. Two sets of comparisons were made. In one, S power divergence is compared with other S-estimators using four distinct rho functions. Plots of efficiency against breakdown point show that the properties of S power divergence are close to those of Tukey’s biweight. The second set of comparisons is between S power divergence estimation and numerical minimization. Monitoring these two procedures in terms of breakdown point shows that the numerical minimization yields a procedure with larger robust residuals and a lower empirical breakdown point, thus providing an estimate of α leading to more efficient parameter estimates.
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Urbanowicz, Tomasz, Anna Olasińska-Wiśniewska, Michał Michalak, Michał Rodzki, Anna Witkowska, Ewa Straburzyńska-Migaj, Bartłomiej Perek, and Marek Jemielity. "Neutrophil to Lymphocyte Ratio (NLR) as an Easily Accessible Parameter for Monitoring Tacrolimus Overdose after Heart Transplantation—Experimental Study." Diagnostics 12, no. 1 (December 24, 2021): 37. http://dx.doi.org/10.3390/diagnostics12010037.
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(1) Background: The combination of candidate selection, immunosuppressive therapy adjustment, and scrutinous monitoring is a cornerstone for optimizing long-term survival after a heart transplant. Neutrophil-to-lymphocyte ratio (NLR) is a simple marker of inflammatory reactions activation and may play a clinical role as a predictive marker in oncological and cardiovascular diseases. The aim of the study was to find simple hematologic indices available from whole blood count to help in immunosuppressive therapy monitoring. (2) Methods: Thirty patients (23 men and 7 women) with a mean age of 43 +/− 13 years who had undergone orthotopic heart transplantation were enrolled into the study. The blood samples for whole blood count and Tacrolimus level were collected during outpatient visits in heart transplant recipients every two months for 18 months after first year post transplantation. (3) Results: There was a significant correlation between Tacrolimus overdose (>15 ng/mL) and NLR (Spearman’s rho 0.99, p < 0.001) and mean platelet volume (Spearman’s rho 0.989, p < 0.001). The ROC analysis for NLR above 3.62 showed predictive properties for Tacrolimus overdose (over 15 ng/mL) (AUC =0.633, p = 0.008) with a sensitivity of 50% and specificity of 83.73%. (4) Conclusions: Our results suggest that NLR above 3.62 may be regarded as a simple indicator of tacrolimus overdose.
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Roberts, M. S., and J. W. Jacobs. "The effects of forced small-wavelength, finite-bandwidth initial perturbations and miscibility on the turbulent Rayleigh–Taylor instability." Journal of Fluid Mechanics 787 (December 7, 2015): 50–83. http://dx.doi.org/10.1017/jfm.2015.599.
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Rayleigh–Taylor instability experiments are performed using both immiscible and miscible incompressible liquid combinations having a relatively large Atwood number of $A\equiv ({\it\rho}_{2}-{\it\rho}_{1})/({\it\rho}_{2}+{\it\rho}_{1})=0.48$. The liquid-filled tank is attached to a test sled that is accelerated downwards along a vertical rail system using a system of weights and pulleys producing approximately $1g$ net acceleration. The tank is backlit and images are digitally recorded using a high-speed video camera. The experiments are either initiated with forced initial perturbations or are left unforced. The forced experiments have an initial perturbation imposed by vertically oscillating the liquid-filled tank to produce Faraday waves at the interface. The unforced experiments rely on random interfacial fluctuations, resulting from background noise, to seed the instability. The main focus of this study is to determine the effects of forced initial perturbations and the effects of miscibility on the growth parameter, ${\it\alpha}$. Measurements of the mixing-layer width, $h$, are acquired, from which ${\it\alpha}$ is determined. It is found that initial perturbations of the form used in this study do not affect measured ${\it\alpha}$ values. However, miscibility is observed to strongly affect ${\it\alpha}$, resulting in a factor of two reduction in its value, a finding not previously observed in past experiments. In addition, all measured ${\it\alpha}$ values are found to be smaller than those obtained in previous experimental studies.
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Hayrapetyan, Feliks V. "ON WEIGHTED SOLUTIONS OF $\overline{\partial}$-EQUATION IN THE UNIT DISC." Proceedings of the YSU A: Physical and Mathematical Sciences 55, no. 1 (254) (May 21, 2021): 20–28. http://dx.doi.org/10.46991/pysu:a/2021.55.1.020.
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In the paper an equation $\partial g(z)/\partial \overline{z} = v(z)$ is considered in the unit disc $\mathbb{D}$. For $C^k$-functions $v$ $(k = 1,2,3,\dots, \infty)$ from weighted $L^p$-classes $(1 \leq p < \infty)$ with weight functions of the type $|z|^{2\gamma} (1-|z|^{2\rho})^{\alpha}$, $z \in \mathbb{D}$, a family $g_{\beta}$ of solutions is constructed ($\beta$ is a complex parameter).
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Menon, Shyam H., Christoph Federrath, Pamela Klaassen, Rolf Kuiper, and Megan Reiter. "On the compressive nature of turbulence driven by ionizing feedback in the pillars of the Carina Nebula." Monthly Notices of the Royal Astronomical Society 500, no. 2 (October 23, 2020): 1721–40. http://dx.doi.org/10.1093/mnras/staa3271.
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ABSTRACT The ionizing radiation of massive stars sculpts the surrounding neutral gas into pillar-like structures. Direct signatures of star formation through outflows and jets are observed in these structures, typically at their tips. Recent numerical simulations have suggested that this star formation could potentially be triggered by photoionizing radiation, driving compressive modes of turbulence in the pillars. In this study, we use recent high-resolution ALMA observations of 12CO, 13CO, and C18O, J = 2 − 1 emission to test this hypothesis for pillars in the Carina Nebula. We analyse column density and intensity-weighted velocity maps, and subtract any large-scale bulk motions in the plane of the sky to isolate the turbulent motions. We then reconstruct the dominant turbulence driving mode in the pillars, by computing the turbulence driving parameter b, characterized by the relation $\sigma _{\rho /\rho _0} = b \mathcal {M}$ between the standard deviation of the density contrast $\sigma _{\rho /\rho _0}$ (with gas density ρ and its average ρ0) and the turbulent Mach number $\mathcal {M}$. We find values of b ∼ 0.7–1.0 for most of the pillars, suggesting that predominantly compressive modes of turbulence are driven in the pillars by the ionizing radiation from nearby massive stars. We find that this range of b values can produce star formation rates in the pillars that are a factor ∼3 greater than with b ∼ 0.5, a typical average value of b for spiral-arm molecular clouds. Our results provide further evidence for the potential triggering of star formation in pillars through compressive turbulent motions.
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Neef, Vanessa, Elke Schmitt, Peter Bader, Frank Zierfuß, Gudrun Hintereder, Andrea U. Steinbicker, Kai Zacharowski, and Florian Piekarski. "The Reticulocyte Hemoglobin Equivalent as a Screening Marker for Iron Deficiency and Iron Deficiency Anemia in Children." Journal of Clinical Medicine 10, no. 16 (August 9, 2021): 3506. http://dx.doi.org/10.3390/jcm10163506.
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Background: Iron deficiency (ID) is one of the most common nutritional deficiencies in children worldwide and may result in iron deficiency anemia (IDA). The reticulocyte hemoglobin equivalent (Ret-He) provides information about the current availability of iron in erythropoiesis. This study aims to examine the validation of Ret-He as a screening marker for ID and IDA in children. Methods: Blood samples were retrospectively obtained from medical records. Anemia was defined according to the definition provided by the World Health Organization (WHO) for children. ID was defined by transferrin saturation (TSAT) < 20% and ferritin < 100 ng/mL. Children were classified into four groups: IDA, non-anemia iron deficiency (NAID), control and others. Results: Out of 970 children, 332 (34.2%) had NAID and 278 (28.7%) presented with IDA. Analysis revealed that Ret-He significantly correlates with ferritin (rho = 0.41; p < 0.001), TSAT (rho = 0.66; p < 0.001) and soluble transferrin receptor (sTfR) (rho = −0.72; p < 0.001). For ROC analysis, the area under the curve (AUC) was 0.771 for Ret-He detecting ID and 0.845 for detecting IDA. The cut-off value for Ret-He to diagnose ID was 33.5 pg (sensitivity 90.7%; specificity 35.8%) and 31.6 pg (sensitivity 90.6%; specificity 50.4%) to diagnose IDA. Conclusions: The present study demonstrates Ret-He to be a screening marker for ID and IDA in children. Furthermore, Ret-He can be used as a single screening parameter for ID and IDA in children without considering other iron parameters. Economically, the use of Ret-He is highly relevant, as it can save one blood tube per patient and additional costs.
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Sawano, Yoshihiro, Masaki Shigematsu, and Tetsu Shimomura. "Generalized Riesz potentials of functions in Morrey spaces L(1,ϕ;κ)(G) over non-doubling measure spaces." Forum Mathematicum 32, no. 2 (March 1, 2020): 339–59. http://dx.doi.org/10.1515/forum-2019-0140.
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AbstractThis paper proves the boundedness of the generalized Riesz potentials {I_{\rho,\mu,\tau}f} of functions in the Morrey space {L^{(1,\varphi;\kappa)}(G)} over a general measure space X, with G a bounded open set in X (or G is {X)}, as an extension of earlier results. The modification parameter τ is introduced for the purpose of including the case where the underlying measure does not satisfy the doubling condition. What is new in the present paper is that ρ depends on {x\in X}. An example in the end of this article convincingly explains why the modification parameter τ must be introduced.
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He, Bing, Yong Hong, and Qiang Chen. "The equivalent parameter conditions for constructing multiple integral half-discrete Hilbert-type inequalities with a class of nonhomogeneous kernels and their applications." Open Mathematics 19, no. 1 (January 1, 2021): 400–411. http://dx.doi.org/10.1515/math-2021-0023.
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Abstract In this paper, we establish equivalent parameter conditions for the validity of multiple integral half-discrete Hilbert-type inequalities with the nonhomogeneous kernel G ( n λ 1 ∥ x ∥ m , ρ λ 2 ) G\left({n}^{{\lambda }_{1}}\parallel x{\parallel }_{m,\rho }^{{\lambda }_{2}}\hspace{-0.16em}) ( λ 1 λ 2 > 0 {\lambda }_{1}{\lambda }_{2}\gt 0 ) and obtain best constant factors of the inequalities in specific cases. In addition, we also discuss their applications in operator theory.
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Burkhardt, Helmut. "High-Beta Optics and Running Prospects." Instruments 3, no. 1 (March 18, 2019): 22. http://dx.doi.org/10.3390/instruments3010022.
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Dedicated high-beta optics are used to make forward proton scattering measurements possible at the LHC. Following a short general introduction and history of special high-beta optics and running conditions, we describe the two types of special high-beta runs planned for 2018. A run at top energy at β y * = 90 m for elastic and diffractive scattering, and a low energy run to measure the rho-parameter in the Coulomb interference region.
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Iijima, Ryusei, Akari Kadooka, Kairi Sugawara, Momo Fushimi, Mizuki Hosoe, and Sayaka Aritake-Okada. "0151 Subjective sleep onset latency is influenced by the sleep structure and body heat loss in human subjects." Sleep 45, Supplement_1 (May 25, 2022): A69—A70. http://dx.doi.org/10.1093/sleep/zsac079.149.
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Abstract Introduction Humans can estimate the time that has elapsed during sleep (time estimation ability; TEA). Although research on the TEA during sleep has advanced in the field of sleep research, few studies have focused on the relationship between the subjective sleep onset latency (SOL), which is an indicator of TEA, and objective sleep structures, body heat loss, and body temperature. This paper investigates the association of the subjective SOL with sleep structures such as the objective SOL, duration of each sleep stage, subjective sleep parameters, and body heat loss in healthy young participants. Methods Twenty six participants (7 men and 19 women, mean age of 21.5 ± 0.5 years) having no sleep problems participated in a 1-hour polysomnographic recording that obtained objective sleep parameters during the daytime while temperatures of the skin (i.e., dorsum of the hand and foot, forehead, and subclavian) and eardrum were recorded at intervals of 1 min. The distal–proximal skin temperature gradient (DPG), which is a good predictor of body heat loss and sleepiness, was calculated. Subjective parameters, such as the subjective SOL, sleep time, sleep depth, sleepiness, and mood, were evaluated before and after sleep. We examined the association of the subjective SOL with objective sleep parameters, DPG, and other subjective parameters. Results Most participants estimated their sleep latency to be longer than their actual SOL (mean objective SOL of 7.6 min vs. subjective SOL of 13.7 min). The objective SOL was significantly correlated with each sleep stage parameter whereas the subjective SOL was negatively correlated with the stage N2 sleep duration (Rho = −0.454, p = 0.020) and correlated with the stage N2 sleep latency (Rho = 0.402, p = 0.051). Participants who estimated a shorter subjective SOL had a higher DPG before sleep periods than that after sleep onset (Rho = −0.692, p < 0.001). Additionally, the subjective SOL was correlated with the subjective sleep depth, subjective wake after sleep onset, and restorative sleep. Conclusion The subjective sleep onset latency in the healthy young participants was affected by the degree of body heat loss before sleep onset and stable shallow nonrapid-eye-movement sleep. Support (If Any)
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Augustin, Victor A., Julia M. Weller, Friedrich E. Kruse, and Theofilos Tourtas. "Can we predict the refractive outcome after triple Descemet membrane endothelial keratoplasty?" European Journal of Ophthalmology 29, no. 2 (July 11, 2018): 165–70. http://dx.doi.org/10.1177/1120672118785282.
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Purpose: To analyze and correlate corneal parameters with refractive shift after Descemet membrane endothelial keratoplasty combined with cataract surgery (triple Descemet membrane endothelial keratoplasty). Methods: This single-center retrospective observational case series included 152 eyes of 152 consecutive patients undergoing triple Descemet membrane endothelial keratoplasty in the first eye for Fuchs endothelial corneal dystrophy. Patients were examined preoperatively, as well as at 3, 6, and 12 months after surgery. The main outcome measures were: refractive shift (predicted refractive outcome based on intraocular lens calculation compared to actual postoperative refractive outcome), central corneal thickness, corneal volume, anterior and posterior corneal curvature, and corneal densitometry. These parameters were analyzed and correlated with the refractive shift after surgery. Results: After 3 months from surgery, a mean refractive shift of +1.12 ± 1.10 D was observed and remained stable until the last follow-up at 12 months (+1.24 ± 1.07 D). Correlation analysis showed a weak but significant positive correlation between refractive shift and preoperative posterior curvature (rho = 0.314; p = 0.002) or preoperative posterior densitometry (rho = 0.227; p = 0.008). No correlation was found between refractive shift and preoperative central corneal thickness, corneal volume, anterior curvature, or anterior/mid-cornea densitometry. Conclusion: Changes of the posterior cornea may have an influence on the refractive shift. Patients with flatter posterior corneal curvature or higher posterior corneal density seem to exhibit a higher hyperopic shift. The weak correlations indicate a poor predictive value of any preoperative parameter used in our study.
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Lin, Maozhou, and Lihui Guo. "The limit Riemann solutions to nonisentropic Chaplygin Euler equations." Open Mathematics 18, no. 1 (January 1, 2020): 1771–87. http://dx.doi.org/10.1515/math-2020-0113.
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Abstract We mainly consider the limit behaviors of the Riemann solutions to Chaplygin Euler equations for nonisentropic fluids. The formation of delta shock wave and the appearance of vacuum state are found as parameter ε \varepsilon tends to a certain value. Different from the isentropic fluids, the weight of delta shock wave is determined by variance density ρ \rho and internal energy H. Meanwhile, involving the entropy inequality, the uniqueness of delta shock wave is obtained.
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Šeliga, Adam, Manuel Kauers, Susanne Saminger-Platz, Radko Mesiar, Anna Kolesárová, and Erich Peter Klement. "Polynomial bivariate copulas of degree five: characterization and some particular inequalities." Dependence Modeling 9, no. 1 (January 1, 2021): 13–42. http://dx.doi.org/10.1515/demo-2021-0101.
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Abstract Bivariate polynomial copulas of degree 5 (containing the family of Eyraud-Farlie-Gumbel-Morgenstern copulas) are in a one-to-one correspondence to certain real parameter triplets (a, b, c), i.e., to some set of polynomials in two variables of degree 1: p(x, y) = ax + by + c. The set of the parameters yielding a copula is characterized and visualized in detail. Polynomial copulas of degree 5 satisfying particular (in)equalities (symmetry, Schur concavity, positive and negative quadrant dependence, ultramodularity) are discussed and characterized. Then it is shown that for polynomial copulas of degree 5 the values of several dependence parameters (including Spearman’s rho, Kendall’s tau, Blomqvist’s beta, and Gini’s gamma) lie in exactly the same intervals as for the Eyraud-Farlie-Gumbel-Morgenstern copulas. Finally we prove that these dependence parameters attain all possible values in ]−1, 1[ if polynomial copulas of arbitrary degree are considered.
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Dziawgo, Ewa. "Wpływ parametru luki na ryzyko opcji sprzedaży." Kwartalnik Kolegium Ekonomiczno-Społecznego. Studia i Prace 3, no. 3 (December 13, 2015): 119–31. http://dx.doi.org/10.33119/kkessip.2015.3.3.9.
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Gap options are singular payoffs options characterized by discontinuity of pay-offfunction. The article presents the properties of the gap put option: construction ofinstrument, the pay-off function, the pricing model, the influence of selected factorson the pricing and the value measurements of risk (coefficients delta, gamma,vega, theta, rho). The paper analyses the influence of the underlying instrument’sprice, the time maturity and the gap parameter on the risk performance of the putoptions using pricing simulations of the currency options on EUR/PLN.
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Carrina Nenggar Dewanti, I Ketut Alit Utamayasa, and IDG Ugrasena. "The correlation between serum ferritin levels and impaired heart function in children with transfusion dependent thalassemia." GSC Biological and Pharmaceutical Sciences 16, no. 2 (August 30, 2021): 190–95. http://dx.doi.org/10.30574/gscbps.2021.16.2.0239.
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Background: Paediatric patients with transfusion dependent thalassemia require regular lifelong red cell transfusions. Blood transfusions increase the risk of iron overload, which can lead to cardiac hemosiderosis. Serum ferritin can be a parameter for evaluating systemic hemosiderosis. Objective: To evaluate the correlation between serum ferritin levels and impaired heart function in children with transfusion dependent thalassemia Methods: A cross sectional study was conducted with transfusion-dependent thalassemia who attended a cardiology and hemato-oncology outpatient clinic from January to December 2018 and had undergone more than 10 transfusion periods. Serum ferritin levels were taken from the mean of 3 measurements before echocardiography. Echocardiography examination was performed by a cardiologist using a 3D Doppler tool to evaluate ejection fraction (EF), tricuspid annular plane systolic excursion (TAPSE) and E / A ratio by calculating the initial diastole (E wave) and atrial contraction (wave A). Data analysis used the Spearman correlation with p <0.05. Results: There were 45 children with a median age of 10 (2-17) years and had received a median of 18 (10-51) blood transfusions. The mean serum ferritin level was 4,321 (1,168-15,233) ng / mL. Blood transfusion frequency was associated with an increase in serum ferritin (rho 0.74, P <0.005). From echocardiography examination, approximately 3/45 children had a feature of dilated cardiomyopathy. The mean value of EF 70 (SD 14.32), TAPSE 1.97 (SD 0.57) cm and an E / A ratio 1.68 (SD 0.46). Serum ferritin was negatively correlated with the ejection fraction (rho = -0.78, P <0.001), TAPSE (rho = -0.65, P <0.001) but positively correlated with the E / A ratio (rho = 0.67, P <0.001). Conclusion: Paediatric patients with TDT have decreased cardiac systolic and diastolic function, and serum ferritin correlates with the decreased cardiac function.
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Rasmussen, Maria, R. Todd Alexander, Barbara V. Darborg, Nadja Møbjerg, Else K. Hoffmann, András Kapus, and Stine F. Pedersen. "Osmotic cell shrinkage activates ezrin/radixin/moesin (ERM) proteins: activation mechanisms and physiological implications." American Journal of Physiology-Cell Physiology 294, no. 1 (January 2008): C197—C212. http://dx.doi.org/10.1152/ajpcell.00268.2007.
Full textAbstract:
Hyperosmotic shrinkage induces multiple cellular responses, including activation of volume-regulatory ion transport, cytoskeletal reorganization, and cell death. Here we investigated the possible roles of ezrin/radixin/moesin (ERM) proteins in these events. Osmotic shrinkage of Ehrlich Lettre ascites cells elicited the formation of long microvillus-like protrusions, rapid translocation of endogenous ERM proteins and green fluorescent protein-tagged ezrin to the cortical region including these protrusions, and Thr567/564/558 (ezrin/radixin/moesin) phosphorylation of cortical ERM proteins. Reduced cell volume appeared to be the critical parameter in hypertonicity-induced ERM protein activation, whereas alterations in extracellular ionic strength or intracellular pH were not involved. A shrinkage-induced increase in the level of membrane-associated phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] appeared to play an important role in ERM protein activation, which was prevented after PtdIns(4,5)P2 depletion by expression of the synaptojanin-2 phosphatase domain. While expression of constitutively active RhoA increased basal ERM phosphorylation, the Rho-Rho kinase pathway did not appear to be involved in shrinkage-induced ERM protein phosphorylation, which was also unaffected by the inhibition or absence of Na+/H+ exchanger isoform (NHE1). Ezrin knockdown by small interfering RNA increased shrinkage-induced NHE1 activity, reduced basal and shrinkage-induced Rho activity, and attenuated the shrinkage-induced formation of microvillus-like protrusions. Hyperosmolarity-induced cell death was unaltered by ezrin knockdown or after phosphatidylinositol 3-kinase (PI3K) inhibition. In conclusion, ERM proteins are activated by osmotic shrinkage in a PtdIns(4,5)P2-dependent, NHE1-independent manner. This in turn mitigates the shrinkage-induced activation of NHE1, augments Rho activity, and may also contribute to F-actin rearrangement. In contrast, no evidence was found for the involvement of an NHE1-ezrin-PI3K-PKB pathway in counteracting shrinkage-induced cell death.
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Navas-Cortés, Juan A., Bernhard Hau, and Rafael M. Jiménez-Díaz. "Yield Loss in Chickpeas in Relation to Development of Fusarium Wilt Epidemics." Phytopathology® 90, no. 11 (November 2000): 1269–78. http://dx.doi.org/10.1094/phyto.2000.90.11.1269.
Full textAbstract:
Development of 108 epidemics of Fusarium wilt of chickpea caused by Fusarium oxysporum f. sp. ciceris were studied on cvs. P-2245 and PV-61 in field microplots artificially infested with races 0 and 5 of F. oxysporum f. sp. ciceris in 1986 to 1989. Disease progression data were fitted to the Richards model using nonlinear regression. The shape parameter was influenced primarily by date of sowing and, to a lesser extent, by chick-pea cultivars and races of F. oxysporum f. sp. ciceris. Fusarium wilt reduced chickpea yield by decreasing both seed yield and seed weight. These effects were related to sowing date, chickpea cultivar, and virulence of the prevalent F. oxysporum f. sp. ciceris race. Regression models were developed to relate chickpea yield to Fusarium wilt disease intensity with the following independent variables: time to initial symptoms (tis), time to inflection point (tip) of the disease intensity index (DII) progress curve, final DII (DIIfinal), standardized area under DII progress curve (SAUDPC), and the Richards weighted mean absolute rate of disease progression (rho). Irrespective of the chickpea cultivar × pathogen race combination, the absolute and relative seed yields decreased primarily by delayed sowing. The relative seed yield increased with the delay in tis and tip and decreased with increasing DIIfinal, SAUDPC, and rho. A response surface as developed in which seed yield loss decreased in a linear relationship with the delay in tis and increased exponentially with the increase of rho.
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Kwon, Oh Chan, Min-Chan Park, and Yong-Gil Kim. "Correlation between serologic parameters and disease activity of IgG4-related disease: Differences between patients with normal and elevated serum IgG4 concentrations." Frontiers in Immunology 13 (October 12, 2022). http://dx.doi.org/10.3389/fimmu.2022.1020459.
Full textAbstract:
ObjectiveWe aimed to identify serologic parameters that correlate with the disease activity of IgG4-related disease (IgG4-RD) in patients with normal and elevated serum IgG4 concentrations, respectively.MethodsThis retrospective cohort study included 148 patients with IgG4-RD. Patients were categorized into normal (≤201 mg/dL) and elevated (>201 mg/dL) serum IgG4 concentration groups. Disease activity was assessed using the IgG4-RD responder index (RI). The correlations between IgG4-RD RI and serologic parameters (erythrocyte sedimentation rate [ESR], C-reactive protein, C3, C4, IgG4 concentration, IgG concentration, and IgG4/IgG ratio) were evaluated in each group, using Spearman’s correlation coefficient.ResultsOf the 148 patients with IgG4-RD, 38 (25.7%) and 110 (74.3%) patients were categorized into the normal and elevated serum IgG4 concentration groups, respectively. In the normal serum IgG4 concentration group, IgG concentration was the only serologic parameter that showed a significant correlation with IgG4-RD RI (rho=0.411, p=0.013). However, in the elevated serum IgG4 concentration group, ESR (rho=0.196, p=0.041), C3 (rho=-0.432, p<0.001), C4 (rho=-0.363, p=0.001), IgG4 concentration (rho=0.423, p<0.001), IgG concentration (rho=0.224, p=0.020), and IgG4/IgG ratio (rho=0.328, p=0.001) correlated with IgG4-RD RI. The combination of C3 and IgG4 concentration (rho=0.509, p<0.001) had the strongest correlation with IgG4-RD RI in this group.ConclusionAmong the serologic parameters tested, IgG concentration was the only parameter that correlated with IgG4-RD RI in patients with normal serum IgG4 concentrations, whereas multiple parameters correlated with IgG4-RD RI in those with elevated serum IgG4 concentrations. The combination of C3 and IgG4 concentration had the strongest correlation coefficient in the latter group.