Input-output analysis

Input–output analysis describes the interdependence between industries in an economy. General equilibrium theory provides the theoretical foundation for input–output analysis, while the input–output table is a prerequisite for empirical input–output work. Advances in science and technology, especially the development of high-speed computers, have made input–output analysis more comprehensive and practical. Among the most important developments in input–output analysis are the implementation of computable general equilibrium (CGE) models and the ability to continually update and expand the tables. Input–output analysis is very helpful for investigating the growth and involvement of producer services in an economy

The verticality of policy mixes for sustainability transitions: A case study of solar water heating in China

Climate change and sustainable development are the defining challenges of the modern era. The field of sustainability transitions seeks systematic solutions for fundamental transformations of socio-technical systems towards sustainability, and exploring the role of policy mixes has been a central research agenda within the field. In the extant literature, there exists a lack of both conceptual and empirical research on the vertical dimension of policy mixes for sustainability transitions. This study provides a multilevel and evolutionary interpretation of the vertical interactions of policy mixes in the process of industrial path development towards sustainability transitions. An exemplary case of solar water heating (SWH) technology in Shandong Province in China is presented, capturing both the bottom-up and top-down processes of interactions. On the one hand, urban-level policy initiatives can inform higher-level policymaking; on the other hand, national-level priorities can greatly configure policy strategies for lower-level governments. Moreover, as the industry matures, the interactions of multilevel policy mixes evolve from simpler, unidirectional patterns to more complex, bidirectional ones through a vertical policy-learning feedback mechanism. This study generates two important policy implications that extend beyond the Chinese context: first, dynamic vertical interactions between multilevel governments indicate the need to develop more nuanced perspectives on the design of policy mixes; second, policy makers need to hold a more dynamic view of policy mixes by recognizing their temporal and coevolutionary nature through the policy learning process

What's so special about China's producer services? an input-output analysis

In the present study, five stylized facts about China's producer services are established through international, intersectoral and intertemporal comparisons based on input–output tables. First, the overall service input ratio is the lowest in all the sample economies. Second, most producer services are supplied by the traditional labor-intensive sectors. Third, manufacturing is the biggest user of producer services, and service industry is the second, while the opposite is true for most of the other sample economies. Fourth, unlike other economies, China's “R&D” is characterized more by consumer services than producer services. Fifth, China has fairly lower service input ratios in almost all the industries. The backward and forward linkages coefficients are both smaller for “real estate activities” and “finance and insurance.” Policy reform should focus not only on specific producer services but also on reducing obstacles that are inhibiting the balanced development of diverse producer services that will help China to optimize its economic structure

Is the Chinese Economy Moving in the Direction of Tertiarization?

Drawing upon output, employment, consumption and trade data, this article examines whether there is an economic tertiarization trend in China 's economy and evaluates the common factors driving current trends. It shows that the tertiarization trend is evident for the overall economy and most regions in terms of the service nominal value-added ratio and service employment and consumption. However, the tertiarization trend is not significant in terms of the service real value-added ratio, and there is even some concurrent "detertiarization" because of the decreasing proportion of services in imports and exports. Indeed, China's tertiarization trend is far behind its industrialization trend. The rise in the relative prices of services explains the rising proportion of household service consumption expenditure and further illuminates why the service real value-added ratio has not grown. The main cause for the growing percentage of service employment is the lag in service labor productivity growth in interaction with the price inelasticity of service demand. "Cost disease" has appeared in service consumption. Copyright (c) 2009 The Authors Journal compilation (c) 2009 Institute of World Economics and Politics, Chinese Academy of Social Sciences.

The Stability Analysis of a Multi-Port Single-Phase Solid-State Transformer in the Electromagnetic Timescale

This paper proposes an overall practical stability assessment for a multi-port single-phase solid-state transformer (MS3T) in the electromagnetic timescale. When multiple stable subsystems are combined into one MS3T, the newly formed MS3T has a certain possibility to be unstable. Thus, this paper discusses the stability assessment of the MS3T in detail. First and foremost, the structure of the MS3T and its three stage control strategies are proposed. Furthermore, the stability analysis of each of the MS3T’s subsystems is achieved through the closed loop transfer function of each subsystem, respectively, including an AC-DC front-end side converter, dual active bridge (DAB) with a high-frequency (HF) or medium-frequency (MF) transformer, and back-end side incorporating DC-AC and dc-dc converters. Furthermore, the practical impedance stability criterion in the electromagnetic timescale, which only requires two current sensors and one external high-bandwidth small-signal sinusoidal perturbation current source, is proposed by the Gershgorin theorem and Kirchhoff laws. Finally, the overall stability assessment, based on a modified impedance criterion for the MS3T is investigated. The overall practical stability assessment of the MS3T can be validated through extensive simulation and hardware results

An Adaptive Frequency Phase-Locked Loop Based on a Third Order Generalized Integral

In this paper, the basic principle and characteristics of a phase-locked loop (PLL) in a single phase grid-connected system are analyzed, and this paper introduces one type virtual orthogonal voltage vector method based on a third order generalized integrator (TOGI) to construct an alpha and beta static coordinate system. The TOGI structure can eliminate the DC offset in a voltage signal or zero offset in the sampling process, and ensure the amplitude of the virtual orthogonal signal is consistent. At the same time, the adaptive frequency estimation unit is introduced, which can effectively deal with the power grid voltage frequency changes and ensure the accuracy of PLL. MATLAB (R2012a, MathWorks, Natick, MA, USA) is used to simulate the variation of power grid voltage frequency, DC component injection, harmonics injection and other parameters, and the performance of PLL is adequately verified. In addition, a 5kW single-phase energy router experimental platform is built to verify the proposed PLL. The experimental results show that the PLL can well track the frequency change of the grid voltage and eliminate the DC offset, so as to achieve accurate phase tracking