ABSTRACT We consider the direct and inverse time‐harmonic acoustic scattering problem for a mixed scatterer, comprising penetrable obstacle two impenetrable obstacles, each with different boundary conditions. In first section, we focus on well‐posedness of by integral method. second prove mathematical basis linear sampling method to reconstruct obstacles give some numerical examples in last section.

In this paper, we study the classical problem of wind in steady atmospheric Ekman layer with constant eddy viscosity. Different from well-known homogeneous system [14,20], retain turbulent fluxes and establish a new nonhomogeneous first order differential equations involving term horizontal dependent. We present existence uniqueness periodic solutions show Hyers-Ulam stability results for systems under mild conditions via matrix theory. Further, consider varying viscosity coefficient...

Guanxi, a distinctive Chinese concept, reflects shared vision of relationships and connections that include mutual understanding, trust, deep bond between individuals. Recognized for its potency in shaping the facilitate business undertakings access to key resources, Guanxi is postulated as potential mediator nexus organizational justice contextual work performance. The depth intertwined with culture values, may be perceived differently across age groups. Specifically, millennials usually...

Fault detection of a rotating rectifier for wound-rotor synchronous starter/generator (WRSSG) without rotor position sensor in the stationary state is necessary successful engine start. Based on high-frequency (HF) voltage injection, novel fault method WRSSG proposed. The HF imposed stator windings main machine, and feature current signal extracted exciter used detection. In this article, with under different working conditions analyzed first. To obtain response exciter, model analyzed....

This paper proposes a novel control strategy for the synchronization of network systems. The designed distributed controllers adopt communication channels to exchange information. controller each heterogeneous node includes two parts: 1) reference generator (RG) copy dynamics leader and 2) adaptive regulator (AR) achieve purpose. Under action sampled-data law, outputs all RGs converge output leader. closed-loop system are be equivalently written as interaction an operator linear...

In this paper, we study the classical problem of wind in steady atmospheric Ekman layer with constant eddy viscosity.Different from previous work, modify boundary conditions and derive explicit solution by using notation matrix cosine sine.For arbitrary height-dependent viscosity, get zero velocity acceleration at bottom layer.In addition, uniqueness is shown dynamical properties are characterized.

This paper further investigates the classical problem of wind in steady atmospheric Ekman layer. For case eddy viscosity being subjected to a quadratic function, we construct an explicit solution, where used approach is different from Delia [Analytical Ekman-type solutions with height-dependent viscosities. J Math Fluid Mech. 2021;23:Article ID 18]. related two-value piecewise-constant, give formula compute surface deflection angle by constructed solution.

Through the literature data method, experimental experiment in teaching reform of methods --using psychological skill training goal setting training, have influence on destination grade 2008 Huanghe Science and Technology College sports dance course studentsEq.The results showed: at present, college students EQ situation needs to be improved before experiment, 12.5% not reach normal value 90; boys whole is slightly higher than girls; after students' emotional intelligence mean difference 6,...

With the development of digital economy and sharp increase in economic information, a large amount data needs to be processed. Therefore, demand for an management information system is also increasing, but how realize allocation resources has become urgent problem solved. This study conducts research on above problems, first analyzes results domestic foreign scholars, finds out content suitable this research, then introduces structure method resource detail. Finally, by comparing testing...

by the methods of literature, experiment method, in teaching reform methods, using mental skill training goal setting training, has influence to Haunches Science and Technology College 2008 Dance Sport Specialized Course Students Eq.The result shows: students' Estuation needs be improved, first 12.5% student not reach normal value 90; boys whole EQ is slightly higher than girls; before after experiment, emotional intelligence mean difference 6, T 5.542, significant at 0, P < 0.05,there was...

Since the 21st century, development of network technology has entered a new stage, and mankind gradually era big data with information explosion. Computer changed people’s lifestyles. People can obtain materials without going out to provide convenience for lives. But it is affected in many ways, but we will also encounter some difficulties process using it. Informatization had profound impact on areas human social life. Especially context global informationization, security (IS) problems...

Nowadays, more and attention has been paid to agriculture. Due the long link from production sales of tea, business environment tea enterprises is becoming complex changeable. The existing supply chain resources simple processes cannot adapt new environment. In order deal with complexity instability this environment, intelligence its coordination services have become an important issue It priority development for seek establish competitive advantages. Therefore, paper first expounds...

In the beginning of framework technology, it was used to solve or deal with complex problems application system.The traditional software testing process has always been basically a manual execution test cases, and same common cases are needed in entire life cycle.Repeatedly performed many times, especially verification phase such as regression testing.In process, there is lack effective data generation methods, which results generated failing cover all system requirements.In this situation,...