Publikační činnost IT4Innovations / Publications of IT4Innovations (9600)

Permanent URI for this collectionhttp://hdl.handle.net/10084/96109

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Ambient- and high-pressure studies of structural, electronic, and magnetic properties of single-crystal EuZn2P2
(American Physical Society, 2024) Rybicki, Damian; Komędera, Kamila; Przewoźnik, Janusz; Gondek, Łukasz; Kapusta, Czesław; Podgórska, Karolina; Tabiś, Wojciech; Żukrowski, Jan; Tran, Lan Maria; Babij, Michał; Bukowski, Zbigniew; Havela, Ladislav; Buturlim, Volodymyr; Prchal, Jiří; Diviš, Martin; Král, Petr; Turek, Ilja; Halevy, Itzhak; Kaštil, Jiří; Míšek, Martin; Dutta, Utpal; Legut, Dominik
A thorough study of EuZn2P2 single crystals, which were grown from Sn flux, was performed using both bulk (heat capacity, ac susceptibility, dc magnetization, electrical resistivitivity, magnetoresistance) and microscopic (M & ouml;ssbauer spectroscopy) techniques. Electrical resistance and magnetic susceptibility were measured also under high pressure conditions (up to 19 and 9.5 GPa, respectively). Further insight into electronic properties and phonons is provided by ab initio calculations. The results indicate that EuZn2P2 is an antiferromagnet with strong Eu-Eu exchange coupling of ferromagnetic type within the basal plane and weaker antiferromagnetic interaction along the c axis. The Eu magnetic moments are tilted from the basal plane. Hydrostatic pressure strongly affects both magnetic (increase of the N & eacute;el temperature) and electronic (suppression of the band gap and semimetallic behavior) properties, indicating a strong interplay of structure with magnetic and electronic degrees of freedom.
Unveiling thermal and hemodynamic effects of aneurysm on abdominal aorta using power law model and finite element analysis
(Elsevier, 2024) Hussain, Azad; Bilal, S.; Arshad, Tayyaba; Dar, Muhammad Naveel Riaz; Aljohani, Abeer Ahmed; Riaz, Muhammad Bilal; Ghith, Ehab
The objective of this study is to find causes of aortic diseases and investigating the ways for better treatment. The governing system of equations has been demonstrated to account for characteristics of blood. The governing system of equation has been solved using the finite element method with appropriate boundary conditions. We analyzed into the relationship between flow characteristics via the aneurysmal abdominal aorta and the aneurysm height, aneurysm length, and non-Newtonian behavior. It investigates how thermal and hemodynamics effects change across the abdominal aortic aneurysm. The velocity, pressure, and temperature surface plots of the results are displayed. There have also been graphic displays of line graphs of axial velocity, radial velocity, axial pressure, radial pressure, axial temperature and radial temperature across the aneurysm. The blood flow simulations obtained results show that increasing blood temperature, pressure and intake velocity all contribute to an increase in viscosity. The results indicate that while the temperature varies little to not at all, the blood flow pressure decrease and velocity significantly vary.
Inclusion of Hall and Ion slip consequences on inclined magnetized cross hybrid nanofluid over a heated porous cone: Spectral relaxation scheme
(Elsevier, 2024) Darvesh, Adil; Santisteban, Luis Jaime Collantes; Riaz, Muhammad Bilal; Sánchez-Chero, Manuel; Akgül, Ali; AL Garalleh, Hakim; Magsood, Hamzah
The cone geometry has a great significant for heat transmission in many industrial processes due to its ability to induce turbulence, enable directional flow, promote uniform temperature distribution, and offer versatility in applications. The current study aims to investigate the heat transport process of an inclined magnetized cross hybrid nanofluid over a heated porous cone under the influence of Hall and Ion slip consequences. Additionally, porous medium the flow is past under the effect of inclined uniform magnetic field and porosity of the medium is used to enhance heat transfer. The framed set of governing equations took the form of dimension free structure through appropriate transformations and then finally solved by an effective spectral relaxation method. Thermal impacts and heat transport mechanism associated with the hybrid flow is seen through different values of emerging parameters. Heat transport is seen higher with higher radiation parameters, as radiation and rising temperature are similar. Augmented values of Fr causes pressure drop in fluids which reduces the fluid motion and brings depreciation in velocity field. Eckert number also boosts the temperature of the fluid stirring via a porous rotating cone.
Highly efficient and selective nitrogen reduction reaction catalysis of cluster-modified MXene nanosheets
(American Chemical Society, 2024) Yu, Rui; Liu, Zhaorui; Legut, Dominik; Sun, Junwei; Zhang, Qianfan; Francisco, Joseph S.; Zhang, Ruifeng
The electrocatalytic synthesis of NH3 holds immense significance for energy conservation in industrial and agricultural production. Herein, an efficient solution is proposed for MXene-based high-activity nitrogen reduction reaction (NRR) catalysts that are modified using tetranuclear non-noble 3d transition metal clusters (M-4). The thorough exploration of M-4/Ti2CO2 candidates reveals that the thermodynamically and kinetically stable Cr-4/Ti2CO2 possesses the lowest overpotential (0.35 V) and high selectivity, comparable to those of well-known NRR catalysts such as Ru(0001) (0.43 V) and Au(310) (1.91 V). In addition, the doping of Fe into Cr-4 clusters can further reduce the overpotential and kinetic barriers by 31 and 46%, respectively. The analysis of the complicated bonding nature reveals the mechanism of the catalytic activity, which demonstrates the role of clusters pulling pi/sigma electrons from N-2 while simultaneously back-donating d orbital electrons to the pi* orbital. A descriptor (phi), related to intrinsic transferred charges (Delta e) of the cluster, is proposed to accurately determine the NRR catalytic activity using simple calculations, and the linear correlation between them can reach 0.98. This work provides guidance for designing promising cluster-modified MXene catalysts for NRR and an elucidation of the electronic factors governing catalytic activity.
Computation of soliton structure and analysis of chaotic behaviour in quantum deformed Sinh-Gordon model
(PLOS, 2024) Jhangeer, Adil; Ibraheem, Farheen; Jamal, Tahira; Riaz, Muhammad Bilal; Kader, Atef Abdel
Soliton dynamics and nonlinear phenomena in quantum deformation has been investigated through conformal time differential generalized form of q deformed Sinh-Gordon equation. The underlying equation has recently undergone substantial amount of research. In Phase 1, we employed modified auxiliary and new direct extended algebraic methods. Trigonometric, hyperbolic, exponential and rational solutions are successfully extracted using these techniques, coupled with the best possible constraint requirements implemented on parameters to ensure the existence of solutions. The findings, then, are represented by 2D, 3D and contour plots to highlight the various solitons' propagation patterns such as kink-bright, bright, dark, bright-dark, kink, and kink-peakon solitons and solitary wave solutions. It is worth emphasizing that kink dark, dark peakon, dark and dark bright solitons have not been found earlier in literature. In phase 2, the underlying model is examined under various chaos detecting tools for example lyapunov exponents, multistability and time series analysis and bifurcation diagram. Chaotic behavior is investigated using various initial condition and novel results are obtained.
Single atom catalysts based on earth-abundant metals for energy-related applications
(American Chemical Society, 2024) Kment, Štěpán; Bakandritsos, Aristides; Tantis, Iosif; Kmentová, Hana; Zuo, Yunpeng; Henrotte, Olivier; Naldoni, Alberto; Otyepka, Michal; Varma, Rajender S.; Zbořil, Radek
Anthropogenic activities related to population growth, economic development, technological advances, and changes in lifestyle and climate patterns result in a continuous increase in energy consumption. At the same time, the rare metal elements frequently deployed as catalysts in energy related processes are not only costly in view of their low natural abundance, but their availability is often further limited due to geopolitical reasons. Thus, electrochemical energy storage and conversion with earth-abundant metals, mainly in the form of single-atom catalysts (SACs), are highly relevant and timely technologies. In this review the application of earth-abundant SACs in electrochemical energy storage and electrocatalytic conversion of chemicals to fuels or products with high energy content is discussed. The oxygen reduction reaction is also appraised, which is primarily harnessed in fuel cell technologies and metal-air batteries. The coordination, active sites, and mechanistic aspects of transition metal SACs are analyzed for two-electron and four-electron reaction pathways. Further, the electrochemical water splitting with SACs toward green hydrogen fuel is discussed in terms of not only hydrogen evolution reaction but also oxygen evolution reaction. Similarly, the production of ammonia as a clean fuel via electrocatalytic nitrogen reduction reaction is portrayed, highlighting the potential of earth-abundant single metal species.
Numerical solution to the time-fractional Burgers-Huxley equation involving the Mittag-Leffler function
(MDPI, 2024) Hayat, Afzaal Mubashir; Riaz, Muhammad Bilal; Abbas, Muhammad; Alosaimi, Moataz; Jhangeer, Adil; Nazir, Tahir
Fractional differential equations play a significant role in various scientific and engineering disciplines, offering a more sophisticated framework for modeling complex behaviors and phenomena that involve multiple independent variables and non-integer-order derivatives. In the current research, an effective cubic B-spline collocation method is used to obtain the numerical solution of the nonlinear inhomogeneous time-fractional Burgers-Huxley equation. It is implemented with the help of a theta-weighted scheme to solve the proposed problem. The spatial derivative is interpolated using cubic B-spline functions, whereas the temporal derivative is discretized by the Atangana-Baleanu operator and finite difference scheme. The proposed approach is stable across each temporal direction as well as second-order convergent. The study investigates the convergence order, error norms, and graphical visualization of the solution for various values of the non-integer parameter. The efficacy of the technique is assessed by implementing it on three test examples and we find that it is more efficient than some existing methods in the literature. To our knowledge, no prior application of this approach has been made for the numerical solution of the given problem, making it a first in this regard.
Investigating pseudo parabolic dynamics through phase portraits, sensitivity, chaos and soliton behavior
(Springer Nature, 2024) Jhangeer, Adil; Ibraheem, Farheen; Jamal, Tahira; Rahimzai, Ariana Abdul; Khan, Ilyas
This research examines pseudoparabolic nonlinear Oskolkov-Benjamin-Bona-Mahony-Burgers (OBBMB) equation, widely applicable in fields like optical fiber, soil consolidation, thermodynamics, nonlinear networks, wave propagation, and fluid flow in rock discontinuities. Wave transformation and the generalized Kudryashov method is utilized to derive ordinary differential equations (ODE) and obtain analytical solutions, including bright, anti-kink, dark, and kink solitons. The system of ODE, has been then examined by means of bifurcation analysis at the equilibrium points taking parameter variation into account. Furthermore, in order to get insight into the influence of some external force perturbation theory has been employed. For this purpose, a variety of chaos detecting techniques, for instance poincar & eacute; diagram, time series profile, 3D phase portraits, multistability investigation, lyapounov exponents and bifurcation diagram are implemented to identify the quasi periodic and chaotic motions of the perturbed dynamical model. These techniques enabled to analyze how perturbed dynamical system behaves chaotically and departs from regular patterns. Moreover, it is observed that the underlying model is quite sensitivity, as it changing dramatically even with slight changes to the initial condition. The findings are intriguing, novel and theoretically useful in mathematical and physical models. These provide a valuable mechanism to scientists and researchers to investigate how these perturbations influence the system's behavior and the extent to which it deviates from the unperturbed case.
Computational study of elastic waves generated by ultrafast demagnetization in fcc Ni
(American Physical Society, 2024) Korniienko, I.; Nieves, P.; Fraile, A.; Iglesias, R.; Legut, Dominik
Picosecond ultrasonics is a fast growing and advanced research field with broad application to the imaging and characterization of nanostructured materials as well as at a fundamental level. The aim of this paper is to provide an advanced 3D model based on atomistic spin -lattice simulations of the laser -induced elastic response in ferromagnetically ordered fcc Ni. The advantage of such an approach is the possibility to take into account the laser radiation interaction with the spins and thus characterize the magnetic contribution to the total stress. We analyze the atomic displacements caused both by the ultrafast thermal expansion of the crystal lattice and by the demagnetization process due to the heating of a certain area of the sample by an ultrashort laser pulse. Subsequently, an attempt is made to propose mathematical expressions for describing the corresponding total stress. The lattice and magnetic contributions have been evaluated, whereupon the former is found to be much greater than the latter.
Mitigation of humidity interference by graphene derivatives for efficient temperature sensors without encapsulation
(Wiley, 2024) Šedajová, Veronika; Štulík, Jiří; Jakubec, Petr; Otyepka, Michal
Temperature monitoring and regulation are essential in various environments, including modern industry and living and storage spaces. The growing demand for temperature sensors calls for affordable, efficient, interference-resistant, and eco-friendly solutions. The challenge of humidity interference in constructing temperature sensors often leads to compromising on the dynamic sensor properties in particular due to the need for encapsulation. To this end, this study introduces a temperature sensor leveraging a carefully designed graphene derivative to mitigate the humidity interference. The material, synthesize through scalable fluorographene chemistry with benzylamine, is optimized in order to enhance its properties, which led to achieving peak efficiency with a minimal humidity impact. The sensor demonstrated full functionality across a temperature range from 10 to 90 degrees C, with a temperature coefficient of resistivity 8.63 x 10-3 K-1, which is more than twice as high as that of conventional platinum thermometers. Remarkably, the sensor exhibited only a 2% change in resistance when exposed to relative humidity in the range of 20 to 70%. Notably, the sensor continues to give a consistent performance even after six months, which proved its stability. The presented device holds promise for evolving into a fully printed, cost-effective and reliable next-generation temperature sensors.
Analytical study of fractional DNA dynamics in the Peyrard-Bishop oscillator-chain model
(Elsevier, 2024) Riaz, Muhammad Bilal; Fayyaz, Marriam; Rahman, Riaz Ur; Martinovič, Jan; Tunç, Osman
In this research, we present a new auxiliary equation approach, which uses two distinct fractional derivatives: /3- and M-truncated fractional derivatives to explore the space-time fractional Peyrard-Bishop DNA dynamic model equation. This examines the nonlinear interplay between neighboring displacements and hydrogen bonds through mathematical modeling of DNA vibration dynamics. The solutions are tasked with examining the nonlinear interaction among neighboring displacements of the DNA strand. The generated solutions exhibit various wave patterns under varying fractional values and parametric conditions: w-shape, bright, combined periodic wave solutions, dark-bright, bell shaped, m-shaped, w-shaped with two bright solutions, and m-shape with two dark solutions. Graphical representations provide a complete analysis of these physical features. The results demonstrate the successful implementation of the proposed approach, which will be advantageous for locating analytical remedies to more nonlinear challenges.
Probabilistic analysis of critical speed values of a rotating machine as a function of the change of dynamic parameters
(MDPI, 2024) Šavrnoch, Zdenko; Sapieta, Milan; Dekýš, Vladimír; Ferfecki, Petr; Zapoměl, Jaroslav; Sapietová, Alžbeta; Molčan, Michal; Fusek, Martin
Real-world rotordynamic systems exhibit inherent uncertainties in manufacturing tolerances, material properties, and operating conditions. This study presents a Monte Carlo simulation approach using MSC Adams View and Adams Insight to investigate the impact of these uncertainties on the performance of a Laval/Jeffcott rotor model. Key uncertainties in bearing damping, bearing clearance, and mass imbalance were modeled with probabilistic distributions. The Monte Carlo analysis revealed the probabilistic nature of critical speeds, vibration amplitudes, and overall system stability. The findings highlight the importance of probabilistic methods in robust rotordynamic design and provide insights for establishing manufacturing tolerances and operational limits.
Analytical and fractional model for power transmission of lossy transmission line
(Taylor & Francis, 2024) Abro, Kashif Ali; Atangana, Abdon; Memon, Imran Qasim; Aziz, Abdul
A lossy transmission line can draw current from DC source if DC voltage is applied to constant resistance. This manuscript proposes a fractional modeling of lossy transmission line based on the partial differential equations by employing Kirchoff's current and voltage laws via Fourier analysis. The governing equation of lossy transmission line is fractionalized by means of modern fractional differential operators. The optimal solution of voltage is investigated by means of Fourier sine and Laplace transforms subject to the imposed conditions. The solutions of voltage over the transmission line have been investigated in terms of exponential and gamma functions. The comparative analysis of voltage over the transmission line through Caputo-Fabrizio and Atangana-Baleanu fractional operators has been presented for line losses on the basis of conductance, resistance and inductance for power transmission.
Qualitative behavior and variant soliton profiles of the generalized P -type equation with its sensitivity visualization
(Elsevier, 2024) Jhangeer, Adil; Raza, Nauman; Ejaz, Ayesha; Rafiq, Muhammad Hamza; Baleanu, Dumitru
This study delves into the exploration of the dynamics of (3 + 1) -dimensional Painlev & eacute; integrable generalized model from different perspectives, which delineates the evolution of nonlinear phenomena in three spatial dimensions and one temporal dimension, displaying the remarkable Painlev & eacute; integrability property. The 06 - expansion technique is applied to extract traveling wave solutions in the form of Jacobi elliptic functions. To give physical insights of obtained solutions, we present these solutions through graphs such as 2D, 3D and contour plots. Further, to understand the planar dynamical system, we employ the concepts of bifurcation, chaos theory and sensitivity analysis. Bifurcation analysis reveals the dependence on the solution of a planar dynamical system at critical points. Additionally, the detection of chaotic movements in the perturbed dynamical system is achieved by detecting tools. Also the sensitivity analysis of the model is investigate by three distinct initial conditions. The findings are innovative, valuable and captivating for the readers in exploring this model.
Dynamics and wave analysis in longitudinal motion of elastic bars or fluids
(Elsevier, 2024) Jhangeer, Adil; Beenish
We look at the bifurcation analysis, chaotic behavior, multistability, and sensitivity analysis of the van der Waals equation, which is used in science and engineering to study the dynamics of various structures. The variant van der Waals equation covers one-dimensional longitudinal isothermal motion in elastic bars or fluids, which is the main focus of this research. The Galilean transformation transfers the given model into a planar dynamical system. The power series methodology produces exact wave solutions. In addition, after accounting for the perturbation component, sensitivity analysis for various initial value problems is used to investigate quasiperiodic, chaotic, and time series behavior. Numerical simulation results show that influencing viscosity and the coefficient of interfacial capillarity influence the dynamical factors of the examined model. We are observing what happens with viscosity and the interface coefficients to the wave solution. In some cases, for different parameter values, we present plots of both one-dimensional and two-dimensional graphical representations of individual solutions.
Comprehensive Assessment of Force-Field Performance in Molecular Dynamics Simulations of DNA/RNA Hybrid Duplexes
(American Chemical Society, 2024) Knappeová, Barbora; Mlýnský, Vojtěch; Pykal, Martin; Šponer, Jiří; Banáš, Pavel; Otyepka, Michal; Krepl, Miroslav
Mixed double helices formed by RNA and DNA strands, commonly referred to as hybrid duplexes or hybrids, are essential in biological processes like transcription and reverse transcription. They are also important for their applications in CRISPR gene editing and nanotechnology. Yet, despite their significance, the hybrid duplexes have been seldom modeled by atomistic molecular dynamics methodology, and there is no benchmark study systematically assessing the force-field performance. Here, we present an extensive benchmark study of polypurine tract (PPT) and Dickerson-Drew dodecamer hybrid duplexes using contemporary and commonly utilized pairwise additive and polarizable nucleic acid force fields. Our findings indicate that none of the available force-field choices accurately reproduces all the characteristic structural details of the hybrid duplexes. The AMBER force fields are unable to populate the C3 '-endo (north) pucker of the DNA strand and underestimate inclination. The CHARMM force field accurately describes the C3 '-endo pucker and inclination but shows base pair instability. The polarizable force fields struggle with accurately reproducing the helical parameters. Some force-field combinations even demonstrate a discernible conflict between the RNA and DNA parameters. In this work, we offer a candid assessment of the force-field performance for mixed DNA/RNA duplexes. We provide guidance on selecting utilizable force-field combinations and also highlight potential pitfalls and best practices for obtaining optimal performance.
Similarities and differences of hydridic and protonic hydrogen bonding
(Wiley, 2024) Lamanec, Maximilián; Zienertová, Jitka; Špeťko, Matej; Nachtigallová, Dana; Hobza, Pavel
Ab initio calculations were employed to investigate the interactions between selected electron-donating groups, characterized by M-H bonds (where M represents a transition metal and H denotes a hydridic hydrogen), and electron-accepting groups featuring both sigma- and pi-holes. The study utilized the omega B97X-D3BJ/def2-TZVPPD level of theory. Hydridic hydrogen complexes were found in all complexes with sigma- and pi-holes. A comparative analysis was conducted on the properties hydridic H-bond complexes, presented here and those studied previously, alongside an extended set of protonic H-bonds complexes. While the stabilization energies changes in M-H bond lengths, vibrational frequencies, intensities of the spectral bands, and charge transfer for these complexes are comparable, the nature of hydridic and protonic H-bonds fundamentally differ. In protonic H-bond complexes, the main stabilization forces arise from electrostatic contributions, while in hydridic H-bond complexes, dispersion energy, is the primary stabilization factor due to the excess of electrons and thus larger polarizability at hydridic H. The finding represents an important characteristic that distinguishes hydridic H-bonding from protonic H-bonds.
Solving linear and nonlinear problems using Taylor series method
(De Gruyter, 2024) Veigend, Petr; Nečasová, Gabriela; Šátek, Václav
The article deals with the solution of technical initial value problems. To solve such problems, an analytical or numerical approach is possible. The analytical approach can provide an accurate result; however, it is not available for all problems and it is not entirely suitable for calculation on a computer, due to the limited numerical accuracy. For this reason, the numerical approach is preferred. This approach uses ordinary differential equations to approximate the continuous behaviour of the real-world system. There are many known numerical methods for solving such equations, most of them limited in their accuracy, have a limited region of stability and can be quite slow to achieve the acceptable solution. The numerical method proposed in this article is based on the Taylor series and overcomes the biggest challenge, i.e. calculating higher derivatives. The aim of the article is therefore twofold: to introduce the method and show its properties, and to show its behaviour when solving problems composed of linear and nonlinear ordinary differential equations. Linear problems are modelled by partial differential equations and solved in parallel using the PETSc library. The parallel solution is demonstrated using the wave equation, which is transformed into the system of ordinary differential equations using the method of lines. The solution of nonlinear problems is introduced together with several optimisations that significantly increase the calculation speed. The improvements are demonstrated using several numerical examples that are solved using MATLAB software.
Unveiling solitons and dynamic patterns for a (3+1)-dimensional model describing nonlinear wave motion
(AIMS Press, 2024) Riaz, Muhammad Bilal; Kazmi, Syeda Sarwat; Jhangeer, Adil; Martinovič, Jan
In this study, the underlying traits of the new wave equation in extended (3 +1) dimensions, utilized in the field of plasma physics and fluids to comprehend nonlinear wave scenarios in various physical systems, were explored. Furthermore, this investigation enhanced comprehension of the characteristics of nonlinear waves present in seas and oceans. The analytical solutions of models under consideration were retrieved using the sub -equation approach and Sardar sub -equation approach. A diverse range of solitons, including bright, dark, combined dark -bright, and periodic singular solitons, was made available through the proposed methods. These solutions were illustrated through visual depictions utilizing 2D, 3D, and density plots with carefully chosen parameters. Subsequently, an analysis of the dynamical nature of the model was undertaken, encompassing various aspects such as bifurcation, chaos, and sensitivity. Bifurcation analysis was conducted via phase portraits at critical points, revealing the system's transition dynamics. Introducing an external periodic force induced chaotic phenomena in the dynamical system, which were visualized through time plots, twodimensional plots, three-dimensional plots, and the presentation of Lyapunov exponents. Furthermore, the sensitivity analysis of the investigated model was executed utilizing the Runge-Kutta method. The obtained findings indicated the e fficacy of the presented approaches for analyzing phase portraits and solitons over a wider range of nonlinear systems.
HyperQueue: Efficient and ergonomic task graphs on HPC clusters
(Elsevier, 2024) Beránek, Jakub; Böhm, Ada; Palermo, Gianluca; Martinovič, Jan; Jansík, Branislav
Task graphs are a popular method for defining complex scientific simulations and experiments that run on distributed and HPC (High-performance computing) clusters, because they allow their authors to focus on the problem domain, instead of low-level communication between nodes, and also enable quick prototyping. However, executing task graphs on HPC clusters can be problematic in the presence of allocation managers like PBS or Slurm, which are not designed for executing a large number of potentially short-lived tasks with dependencies. To make task graph execution on HPC clusters more efficient and ergonomic, we have created HYPERQUEUE, an open-source task graph execution runtime tailored for HPC use-cases. It enables the execution of large task graphs on top of an allocation manager by aggregating tasks into a smaller amount of PBS/Slurm allocations and dynamically load balances tasks amongst all available nodes. It can also automatically submit allocations on behalf of the user, it supports arbitrary task resource requirements and heterogeneous HPC clusters, it is trivial to deploy and does not require elevated privileges.

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