Production Theory - Science topic

The Beijing Hangzhou Grand Canal has become an important component of China’s national cultural park construction. In order to improve the tourism efficiency of cities along the Beijing Hangzhou Grand Canal, this paper constructs an evaluation index system for tourism efficiency of cities along the Beijing Hangzhou Grand Canal based on spatial prod...

This paper focuses on a typical pressure-controlled slide valve, utilizing momentum analysis and computational fluid dynamics to simulate and analyze the asymmetry of steady flow force curves under bidirectional throttling patterns. The entropy production theory is employed to reveal the causes of nonlinearity in the steady flow force of an inlet t...

A bstract We study duality defects in 2+1d theories with $$ {\mathbb{Z}}_N^{(0)}\times {\mathbb{Z}}_N^{(1)} $$ ℤ N 0 × ℤ N 1 global symmetry and trivial mixed ’t Hooft anomaly. By gauging these symmetries simultaneously in half of the spacetime, we define duality defects for theories that are self-dual under gauging. We calculate the fusion rules i...

The head, efficiency, and cavitation characteristics of centrifugal pumps are highly dependent on the velocity field in front of the impeller inlet. In multistage pumps, the velocity field in front of the second and each subsequent stage is determined by the shape (design) of the diffuser return guide vanes. This current work presents the results o...

Enhancing urban ecological resilience (UER) is important in promoting sustainable urban development, and developing new quality productivity (NQP) is an intrinsic requirement to promote industrial change and high-quality development. The coordinated development of UER and NQP can help realize the green transformation and upgrading of various indust...

Waterjet propulsion systems are the core power units of high-performance ships and are widely used in marine engineering. This study uses the entropy production theory to analyze the influence of geometric parameter changes on the thrust and propulsion efficiency of a water jet propulsion system at low cruising speeds. The results indicate that, ba...

Counter-rotating wet gas compressor is an ideal equipment for pressurizing natural gas in offshore gas fields. It has a compact structure, a wide range of operating conditions, and a certain liquid tolerance in the process of gas pressurization. However, due to the opposite rotation of the adjacent rotors, and the characteristics of the flow contai...

Performance analysis using data envelopment analysis is sensitive to data variability and uncertainty. Therefore, it is necessary to adapt classic data envelopment analysis models when dealing with data uncertainty. This paper aims to examine the technical efficiency and scale elasticity of production processes involving undesirable outputs in a st...

Promoting the comprehensive revitalization of the countryside can provide solid support for Chinese-style modernization, and the new quality productivity, as a newer, innovative and high-quality productivity, has an important empowering effect on the in-depth implementation of the comprehensive revitalization of the countryside. This paper discusse...

Many studies have employed a variety of techniques to further investigate topological space, particularly the notion of bitopological spaces, due to the significance of topological space in data processing as well as certain implementations. Numerous extended topological structures have been laid out subsequently. Of those abstractions, functions i...

A mathematical model of tongue in the midsagittal plane is constructed. A tongue contour is modeled as a flexible elastic beam, for which the elastic line equation is numerically solved for the given boundary conditions and the distributed external forces. The database of tongue contours collected from the solutions of the elastic line equation is...

To reveal the internal flow loss characteristics of a multi-stage pump, the unsteady calculation of the internal flow field of a seven-stage centrifugal pump was carried out, and the entropy production theory and Q criterion were utilized to analyze the unsteady flow characteristics of each flow component under different flow rates. The research re...

Objective: The objective of this study is to investigate the evolution of date production in Algeria and its impact on the country's national income (GDP) from 2000 to 2019. This research aims to analyze the short-term and long-term relationships between date production and national income, assessing the significance of agricultural policies in enh...

Under partial load operating conditions, vortex rope generation in the draft tube of a Francis turbine is considered one of the main reasons for hydro unit vibration. In this paper, a Francis turbine HLA551-LJ-43 in the laboratory was taken as a prototype. Numerical simulations of the entire flow passage were carried out. Four different hydro-turbi...

The competitive nature and the changing dynamics of Nigeria banking environment has thrown a lot of challenges which only the strongest among the deposit money banks could survive. Organisations are increasingly laying more emphasis on motivating executive staff employees since their actions or inactions have serious performance implications for th...

The widespread utilization of the Two-way passage pumping device (TPPD) in riverside areas notwithstanding, there exists a notable inadequacy in quantitative research pertaining to its energy and hydraulic characteristics. On the basis of division pier optimization, the entropy production theory (EPT) with computational fluid dynamics is applied to...

Research related to the lemma that supports pure values ??according to Levelt's Speech Production theory (1999), is less studied by researchers in Malaysia. The findings of previous studies only relate to the analysis of communication according to the output of the outer circle through the principles of Levelt's Theory of Speech Production in 2012....

The sharp decrease in the efficiency of a mixed flow pump within over-load flow rates presents a challenge for coastal drainage pumping stations. To address this issue, two different structures of advanced inlet guide vanes (AIGV), full-adjustable (FA) and half-adjustable (HA) structures, are designed to approach a better energy performance improve...

The main objective of this research is to examine the growth of green productivity in the industry and transportation sectors of Iran (as influential sectors of the country) during the period of 1380-1398 and compare it with the conventional productivity index, which has been the criterion that considered in policy-making decisions in the country f...

The main objective of this investigation is to evaluate the relationship between the Entropy Generation Rate (EGR) and the performance of a Gorlov Hydrokinetic Turbine (GHT). Experimental and numerical research is conducted on a fully submerged GHT in an open channel. The numerical results of the power coefficient are validated using experimental d...

This study highlights the deep influence that Cournot’s economic thought had on the subsequent neoclassical and mainstream economics. Cournot’s idea for perfect competition through an infinite number of firms, each of inappreciable production that cannot affect the price, thus leading to price stability, has been fully adopted by the subsequent neo...

This study examined the colonial transformation of the Aembu access to land and labour division in food crop production from 1906-1963. Colonial practices and policies undermined the Aembu land and labour systems in food crop production. Methodologically, the study used descriptive research design and Articulation of Modes of Production Theory. The...

Contestation among traditional art performances, in the technology and information era, creates complex and diverse challenge to the dance of Reog Bulkiyo. In 1999, the dance had to be stopped following the regeneration and economical problem. Although Reog Bulkiyo has been performed again since 2009, the conditions which makes this dance can be pr...

This study employs numerical simulation to investigate the transient flow and cavitation performance of centrifugal pumps with rough impellers, validating the numerical method with experimental data. Initially, the effect of blade roughness on the external characteristics of centrifugal pumps is examined. Subsequently, the study specifically addres...

The purpose of this study is to establish a new analytical method for obtaining atomic solutions of partial differential equations. This is done by combining tensor product theory in Banach spaces with some properties of atom operators. To verify our findings, we give some examples.

In order to obtain a more detailed and comprehensive relationship between the cavitation phenomenon and energy loss, this paper takes an NACA66 hydrofoil as an example to analyze the specific relationship between the cavitation flow field and energy dissipation by using entropy production theory, a ZGB cavitation model, and k-ε turbulence model whi...

This paper seeks to draw a research agenda for unveiling the underlying bottlenecks and possibilities for improving the agricultural total factor productivity in the European Union (EU). To this aim, the paper first surveys the key challenges for the modern agricultural economy. Then, the case of the EU is discussed by looking at the convergence in...

In current engineering, the transition process of pump turbines from pump to turbine mode mainly includes the shutdown process of pump operating and the startup process of turbine operating, and the switching of working conditions mostly depends on the opening and closing of the ball valve. While, this article focuses on the transitional process of...

Improving China’s high-quality development efficiency represents a key lever for the development of new productivity and successfully achieving the “dual carbon” goal. Starting from the nonparametric production theory, this paper addresses the issues of infeasible solutions and technical heterogeneity by employing the total-factor non-radial direct...

Vortices always happen in the forebay and sump of a lateral pumping station, reducing its efficiency and wasting extra electric power. This study utilizes computational fluid dynamics (CFD) technology and a model test method to investigate the distribution of vortices in the forebay of a lateral pumping station of Y-shaped channel. Since the vortex...

As the critical component of a nuclear power plant (NPP), the reactor coolant pump (RCP) will suffer energy losses during operation, which can lead to a series of safety issues and adversely affect the efficiency and stability of the NPP. In this study, the SST k-ω turbulence model is utilized to simulate the internal flow field of an axial-flow re...

This scholarly article explores the complex relationship between production theory and the capital structure of a firm. Production theory refers to the methodical approach that businesses use to determine the optimal output quantities based on market demand. The article thoroughly discusses how production theory impacts decision-making processes re...

The use of pump in turbine mode is an evolving research field. This article is mainly focused on the influence of splitter blades on the turbine mode of pump exclusively. CFD analysis on low specific speed pump geometry was performed. The geometry of sidewall gaps spaces between the rotor and stator system was also included in the computational mod...

Diverging from studies that categorize influencers solely as advertising figures subject to interpretation within marketing frameworks, this research employs an extensive netnography to examine influencers through the lens of cultural production theory. It views them as creators and creative individuals who adeptly cultivate communities around them...

The use of pumps as turbines has been gaining more and more attention in recent years. The present work mainly investigates the influence of blade wrap angle on the internal flow and pressure fluctuation characteristics of centrifugal pumps as turbines. Five different wrap angles (35°,45°, 55°, 65°, and 75°) for a forward-curved impeller were numer...

In this article we show that the conformal nets corresponding to WZW models are rational, resolving a long-standing open problem. Specifically, we show that the Jones-Wassermann subfactors associated with these models have finite index. This result was first conjectured in the early 90s but had previously only been proven in special cases, beginnin...

Flow meters are extensively utilized in fields such as chemical engineering, petroleum, and aerospace, and are an indispensable component of modern industry. This paper examines the metrological properties of a dual-rotor turbine flow meter within its measurable flow range through experimental approaches and investigates the cavitation flow dynamic...

This article aims to map the social production theory conceptually by Janet Wolff and its application in philological studies by taking the Hikayat Indraputra as an example of an object of analysis. Conceptually and analytically social production theory covers the aesthetic codes that set the literature, the ideology, the cultural production aspect...

This paper investigates the influence of cascade density on energy dissipation in the impeller of a multi-blade axial-flow pump. Three-dimensional transient numerical simulations were conducted using the SST k-ω turbulence model for impeller schemes with different cascade density, corresponding to different blade chord length and pitch. Entropy pro...

This article discusses the construction of the Muslims youth identity in cafes. Cafes as a public habitus that is constructed modern and considered not 'Islamic' does not mean that it has no relationship with Islam. Therefore, this article seeks to answer the question of what is the relationship between Islam, cafes, and social media? So, to what e...

El artículo consiste en la explicación de la utilización del muralismo para la reconfiguración de los espacios de las colonias del oriente de Ciudad Juárez afectadas por la violencia extrema que comenzó en el año 2008 durante la administración del expresidente Felipe Calderón Hinojosa. Analizado con la teoría de la producción del espacio de Henri L...

To investigate the flow characteristics in front chamber and rear chamber in pump mode and pump as turbine mode, a 3D computational model of a centrifugal pump was established, including the front and rear chamber. Based on Realizable k-ε turbulence model, numerical calculations of incompressible flow were carried out for internal viscous flow in t...

Unobservable Markov decision processes (UMDPs) serve as a prominent mathematical framework for modeling sequential decision-making problems. A key aspect in computational analysis is the consideration of decidability, which concerns the existence of algorithms. In general, the computation of the exact and approximated values is undecidable for UMDP...

Development has been a long-age phenomenon from the millennium to sustainability. This is because the new millennium ushered in the episode of development in the global economy from the role of inputs to the role of productivity and knowledge. Thus, understanding the forefront of initiatives to develop better policies for better lives and to find f...

In the interiors of ancient Huizhou buildings in China, a profusion of wood carvings are employed for decoration, with traditional research interpreting their function from decorative and aesthetic perspectives. However, this research suggests that the role of Huizhou wood carvings in interior spaces surpasses mere decoration; they enhance the expr...

With the development of modern fluid machinery, the energy density of pumps is gradually being improved, and at the same time, higher demands are being placed on the cavitation performance, hence the introduction of the inducer and centrifugal impeller to form a dynamic–dynamic series structure. However, there are strict constraints on the axial si...

Purpose: The study aimed at determining the gender gap in agricultural productivity: A case of Smallholder Farmers in Busia Kenya. Methodology: The research employed a correlational research approach, utilizing multistage sampling to choose 384 participants from seven sub-counties within the study region. Data collection utilized structured questio...

This comment aims to provide a critical analysis of the article entitled "Uncertainties in estimating production costs of future nuclear technologies: A model-based analysis of small modular reactors" [Energy 280 (2023) 128204], which presents a model-based analysis to estimate the future costs of small modular reactors (SMRs). Their work is timely...

In this paper, in order to investigate the heat transfer characteristics of three-dimensional nanofluid jet microchannel (NJMC), the two-fluid model based on Euler's method coupled with the turbulence model is used to numerically simulate the Al2O3-desionized water jet impingement cooling process, and the results of the study show that the inlet fl...

Flow losses in centrifugal pumps handling non-Newtonian fluids are of great importance for design optimization, performance prediction, and energy savings. Traditional methods are very limited in determining energy losses due to the complex rheological behavior of such fluids. This study aims to investigate the hydraulic losses and performance degr...

With the rapid development of digital technology and new media, short videos have become a popular means of expression among young people today. However, most short video production courses often neglect the cultivation of aesthetics and art, lacking in creativity and aesthetic appreciation. Therefore, integrating aesthetic education into short vid...

We introduce manifestly crossing-symmetric expansions for arbitrary systems of 1D CFT correlators. These expansions are given in terms of certain Polyakov blocks which we define and show how to compute efficiently. Equality of operator product expansion and Polyakov block expansions leads to sets of sum rules that any mixed correlator system must s...

In this article, we introduce an analytical method for solving both non-separable linear and non-linear partial differential equations, for which separation of variables method does not work. This method is based on the theory of tensor product in Banach spaces coupled with some properties of atoms operators. We provide some illustrative examples.

Today, production usually takes place in complex networks. An important question is how the efficiency of the whole network is related to that of its units. Respective research on this topic has been strongly growing over the past decades, as a rule using methods of data envelopment analysis that are known as “network DEA”. However, there is a lack...

The effect of the blade inlet angle on the pump‐as‐turbine (PAT) has not been adequately investigated. The hydraulic performance of PAT was analyzed using an available test rig. The accuracy of the numerical data was established by the comparative analysis of the experimental data. The study demonstrated that as the blade inlet angle increases, so...

The combination of marketing and production integrates functions that generate profits in the business environment and provide organizational value toward a competitive advantage in the sector. Identifying opportunities in the design of new products corresponds to a task consistent with studying the factors involved in the strategies of participati...

The study of quantum channels is the most fundamental theoretical problem in quantum information and quantum communication theory. The link product theory of quantum channels is an important tool for studying quantum networks. In this paper, we establish the Stinespring dilation theorem of the link product of quantum channels in two different ways,...

This paper proposes an innovative management optimization method for the challenges facing the management of industrial enterprises in the context of the current rapid development of the industrial economy. The article combines human factors engineering and lean production theory to optimize the management efficiency and effectiveness of industrial...

Sustainable continuous cover forestry is defined and analyzed in several ways. The differential equation representing growth of the basal areas of individual trees, motivated by fundamental biological production theory by Lohmander (2017a), is analyzed and extended in different directions. From the solution of the differential equation, the basal a...

The fluctuation of heat source conditions results in off-design operation of the radial inflow turbines (RIT) in the organic Rankine cycle. However, the flow loss characteristics of RIT under off-design conditions have not been completely revealed. The entropy production theory has the advantage of determining the quantity and location of energy di...

This study examines the S-characteristic, a key factor affecting the safe grid connection and operation of pumped-storage units, and its significant impact on the safety of pumped-storage power stations. We conducted numerical simulations and model experiments to investigate vortex motion characteristics in the vaneless space and runner passage of...

This study focuses on the splitter blade pump–turbine as the research object to analyze the problems of hump characteristics and the hysteresis effect. We simulated the operation of the pump condition with small opening of the guide vane, analyzed the hydraulic loss by using the entropy production theory and entropy wall function, and investigated...

Water-jet pumps are widely used in ship and other power fields. An axial-flow water-jet pump is studied with different size of tip clearance, and the cavitation characteristics are studied based on the theory of entropy production. Modified SST with curvature correction and modified Zwart cavitation model based on vortex identification are adopted,...

With rapid urbanization in China, an increasing number of urban dwellers are migrating to rural areas, becoming “new villagers”. This phenomenon provides both opportunities and challenges for rural revitalization. This study aims to examine the community integration dilemmas of these new villagers from the perspective of social space production the...

Adaption to prices is an important feature of productivity development. This paper proposes an extension of the StoNED model to accommodate estimation of allocative efficiency. It demonstrates how indirect production theory is suited for assessing allocative efficiency and helps alleviating the curse of dimensionality for stochastic nonparametric e...

Research innovation can be fostered under the right circumstances, which include high levels of research autonomy, opportunities for collaborative research, and an open-minded research community able to combine innovation with more conventional lines of research. In the literature, different types of collaboration and team composition are linked to...

Sustainable and fast fashion brands compete to provide diverse choices for consumers. This study aims to identify characteristics of Indonesian Gen Z and millennial women consumers of sustainable apparel, analyze the influence of product attributes and marketing factors on their purchasing decisions, and examine the impact of individual and social...

Tip leakage flow is one of the significant factors influencing the internal flow stability of mixed-flow pumps, and in severe cases, it can lead to channel blockage and energy loss. In order to gain a deeper understanding of the energy dissipation mechanism induced by tip leakage vortex cavitation, this study is based on the Wray–Agarwal (WA) turbu...

Hydraulic vibrations in Francis turbines caused by cavitation profoundly impact the overall hydraulic performance and operational stability. Therefore, to investigate the influence of cavitation phenomena under high-load conditions, a three-dimensional unsteady numerical simulation is carried out for a Francis turbine with different head operating...

Aims: This study focused on determining the level of technical efficiency (TE) and its corresponding common factors across all crops grown by Tanzanian smallholder farmers. The motive of this study came from production theory and production efficiency and the research was strongly attracted by the ongoing subsistence nature of the agriculture secto...