Using a unique representative panel survey of Vietnamese enterprises in 2020, we find that the pandemic and associated government support package had a heterogenous impact across firms. The government support package, particularly tax cuts and deferrals, helped alleviate short term stress, but tight ineligibility criteria and cumbersome procedures impacted take-up. Econometric analysis suggests that the likelihood of accessing support was associated with firm size, with larger firms more likely to receive support compared to smaller firms, even after controlling for sector, firm ownership and financial health. Credit support was effective in alleviating liquidity constraints and allaying firm pessimism only for large firms. Interestingly, firms experiencing sales losses and those with lower pre-crisis productivity were more likely to resort to digitalization, suggesting that the pandemic could help narrow productivity gaps.
This book by Vietnamese and Russian authors is the first of its kind and combines the extensive knowledge on the petrology and metallogeny of the late Paleozoic – early Mesozoic and Cenozoic periods in North Vietnam. The Permian – Triassic and Paleogene volcano-plutonic and plutonic associations are two important geological events in the evolutionary history of Southeast Asia, including the 260 – 250 Ma Emeishan mantle plume and Indian-Eurasia collision at 60 – 55 M. The volume includes 9 chapters, divided into 3 parts. Part 1 introduces the geological structure of North Vietnam; Part 2 covers the Permian – Triassic magma associations and metallogeny; and Part 3 focuses on the Cenozoic magma associations and metallogeny. In each chapter, the geological setting of magmas, classification of different geological structures, and composition characteristics, such as mineralogy, geochemistry, isotope systematics and geochronology are discussed. This book represents an important reference document for international and Vietnamese geologists engaged in the geological history and metallogeny of Vietnam, an important area of the Asian continent. The monograph also has a practical significance in contributing new premises and to assess rare and precious mineral prospects. In addition, it can be regarded as a necessary data base for petrological and metallogenic projects and university courses.
In the field of aeronautical dynamics, this book offers readers a design tool which enables them to solve the different problems that can occur during the planning stage of a private project. The authors present a system for the modeling, design and calculation of the flying qualities of airplanes and drones, with a complete mathematical model by Matlab/Simulink. As such, this book may be useful for design engineers as well as for keen airplane amateurs. The authors expound the various phases involved in the design process of an airplane, starting with the formulation of a design tool, under the form of a 0D mathematical model (dimensionless, time dependent), before moving on to explore the behavior of the airplane under certain circumstances and offering insights into the optimization of airplane flying qualities. As validation of this model, they present a numerical result, drawn from data collected on an existing plane – the Concorde. The dimensional process is then explored and applied to a realistic drone project. Recommendations on the development of the principal characteristics of the plane (i.e. mass distribution, air load, wing span) are given. Contents 1. 0D Analytical Modeling of theAirplane Motions. 2. Design and Optimizationof an Unmanned Aerial Vehicle (UAV). 3. Organization of the Auto-Pilot. This book provides a description of the modeling, design, and calculation of the aeronautical qualities of airplanes and drones. Divided into several parts, this book first summarizes all the necessary theoretical developments about the equations of motions and trajectory calculations of the machine. It then goes on to describe practical building processes and considers piloting methods. The last part makes a comparison between theoretical calculations and measured recorded data of the real flying machine. Accompanied by a complete mathematical model in MATLAB/SIMULINK
In the field of aeronautical dynamics, this book offers readers a design tool which enables them to solve the different problems that can occur during the planning stage of a private project. The authors present a system for the modeling, design and calculation of the flying qualities of airplanes and drones, with a complete mathematical model by Matlab/Simulink. As such, this book may be useful for design engineers as well as for keen airplane amateurs. The authors expound the various phases involved in the design process of an airplane, starting with the formulation of a design tool, under the form of a 0D mathematical model (dimensionless, time dependent), before moving on to explore the behavior of the airplane under certain circumstances and offering insights into the optimization of airplane flying qualities. As validation of this model, they present a numerical result, drawn from data collected on an existing plane – the Concorde. The dimensional process is then explored and applied to a realistic drone project. Recommendations on the development of the principal characteristics of the plane (i.e. mass distribution, air load, wing span) are given. Contents 1. 0D Analytical Modeling of theAirplane Motions. 2. Design and Optimizationof an Unmanned Aerial Vehicle (UAV). 3. Organization of the Auto-Pilot. This book provides a description of the modeling, design, and calculation of the aeronautical qualities of airplanes and drones. Divided into several parts, this book first summarizes all the necessary theoretical developments about the equations of motions and trajectory calculations of the machine. It then goes on to describe practical building processes and considers piloting methods. The last part makes a comparison between theoretical calculations and measured recorded data of the real flying machine. Accompanied by a complete mathematical model in MATLAB/SIMULINK
WIDE BANDGAP NANOWIRES Comprehensive resource covering the synthesis, properties, and applications of wide bandgap nanowires This book presents first-hand knowledge on wide bandgap nanowires for sensor and energy applications. Taking a multidisciplinary approach, it brings together the materials science, physics and engineering aspects of wide bandgap nanowires, an area in which research has been accelerating dramatically in the past decade. Written by four well-qualified authors who have significant experience in the field, sample topics covered within the work include: Nanotechnology-enabled fabrication of wide bandgap nanowires, covering bottom-up, top-down and hybrid approaches Electrical, mechanical, optical, and thermal properties of wide bandgap nanowires, which are the basis for realizing sensor and energy device applications Measurement of electrical conductivity and fundamental electrical properties of nanowires Applications of nanowires, such as in flame sensors, biological sensors, and environmental monitoring For materials scientists, electrical engineers and professionals involved in the semiconductor industry, this book serves as a completely comprehensive resource to understand the topic of wide bandgap nanowires and how they can be successfully used in practical applications.
The paper uses firm-level data to assess the financial health of the Vietnamese non-financial corporate sector on the eve of pandemic. Our analysis finds that smaller domestic firms were particularly vulnerable even by regional comparison. A sensitivity analysis suggests that the COVID-19 shock will have a substantial impact on firms’ profitability, liquidity and even solvency, particularly in the hardest hit sectors that are dominated by SMEs and account for a sizeable employment share, but large firms are not immune to the crisis. Risks of default can propagate more broadly through upstream and downstream linkages to industries not directly impacted, with stresses potentially translating into an increase in corporate bankruptcies and bank fragility. Policy measures taken in the immediate aftermath of the crisis have helped alleviate liquidity pressures, but the nature of policy support may have to pivot to support the recovery.
In this thesis, we consider a problem arise in tomography: artifacts in a class of filtered back projection formulas. We discuss visible singularities and boundary singularities and the possibility of cancellation of these artifacts.
This book by Vietnamese and Russian authors is the first of its kind and combines the extensive knowledge on the petrology and metallogeny of the late Paleozoic – early Mesozoic and Cenozoic periods in North Vietnam. The Permian – Triassic and Paleogene volcano-plutonic and plutonic associations are two important geological events in the evolutionary history of Southeast Asia, including the 260 – 250 Ma Emeishan mantle plume and Indian-Eurasia collision at 60 – 55 M. The volume includes 9 chapters, divided into 3 parts. Part 1 introduces the geological structure of North Vietnam; Part 2 covers the Permian – Triassic magma associations and metallogeny; and Part 3 focuses on the Cenozoic magma associations and metallogeny. In each chapter, the geological setting of magmas, classification of different geological structures, and composition characteristics, such as mineralogy, geochemistry, isotope systematics and geochronology are discussed. This book represents an important reference document for international and Vietnamese geologists engaged in the geological history and metallogeny of Vietnam, an important area of the Asian continent. The monograph also has a practical significance in contributing new premises and to assess rare and precious mineral prospects. In addition, it can be regarded as a necessary data base for petrological and metallogenic projects and university courses.
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