BASIS FOR ORIENTING AND FORMULATING POLICIES FOR AN EFFECTIVE AND SUSTAINABLE DEVELOPMENT OF ETHNIC MINORITY AREAS IN VIETNAM

Ethnic minorities in Vietnam live primarily in mountainous areas, which border a large area and account for three-quarters of the country's land area and play a very important strategic role in terms of politics, economy, national defense, and ecological environment. Vietnam's ethnic minorities have amassed a distinct and diverse national cultural treasure over thousands of years of creating and protecting the country. Long-held beliefs, practices, and traditions have given each ethnic group its own particular cultural identity, contributing significantly to the diversity and richness of Vietnamese culture. The formulation and implementation of appropriate policies and laws for ethnic minority areas is nothing more than the exploitation and promotion of all the country's potential to improve and raise the quality of people's lives; create the best conditions for ethnic minorities to escape poverty and backwardness; implement equality, respect, solidarity, and harmoniously settle relations between ethnic groups, helping each other to develop sustainably. The article provides some basis for effective and sustainable ethnic minority development policies.  Article visualizations

THE IMPACT OF INDIAN CULTURE ON VIETNAM FROM THE ASPECT OF DIPLOMATIC EXCHANGE AND COOPERATION

India is a South Asian country with a land area of 3,287,590 km2, the world's second-largest population, and the world's seventh-largest economy in nominal GDP (2016). More than 2000 years ago, the Southeast Asian native culture class of Vietnam, alongside the Chinese cultural mainstream, is the bold mark of Indian culture. Since the Cold War, India has continued to advance its policy toward the East through diplomatic relations, and Vietnam is one of the countries with which India has established early diplomatic relations. The continuous exchange and cooperation from the past to the present has helped India to accompany Vietnam in many different areas, ranging from culture, painting, art, architecture, religion, and so on, to trade, education, and science.  Article visualizations

Micro/Nanofluids in Sustainable Machining

Micro/nanofluids are the recent alternative solutions for cooling lubrication that can be defined as the fluids containing microparticles or nanoparticles, which own superior lubrication and cooling characteristics. For these reasons, they have gained significant attention in industrial applications, such as automotive, machining, and biomedical industries. In this chapter, the authors mainly present the recent progress and applications of nanofluids in machining processes, as well as some initial researches about microfluids. Nanofluids provide an excellent media in cutting zone for enhancing the thermal conductivity and tribological characteristics. Therefore, they help to enhance the cutting performance by reducing the coefficient of friction, cutting temperature tool wear, and improving the surface quality. Moreover, the application of nanoparticles in vegetable oils, which are inherently nontoxic as well as biodegradable, gives them superior lubrication properties suitable for MQL application, especially for difficult-to-cut materials. The novel green technology definitely brings out many new solutions in machining practice

SOME REMARKS ON THE SELF-ORGANIZING FEATURE MAPS

Joint Research on Environmental Science and Technology for the Eart

Analysis of flow characteristics of cylindrical and helical type multi-lobe roots blower

Roots blower is a positive displacement machine that has the advantage of a larger flow than conventional blowers. Roots blowers are widely used in industrial production such as chemicals, food, medical, etc. However, during actual operation, this type of machine often achieves low performance. One of the issues that greatly affect performance is the flow characteristics of the blower. Flow characteristics include factors related to flow rate, pressure, and flow phenomena in the blower chamber. Flow characteristic analysis is a complex problem in hydraulic machines. Flow analysis helps to investigate the motion of the flow to design high-performance machines. This study uses a mathematical model of gear theory to design the rotor profile with cylindrical and helical lobes of the multi-lobe Roots blower. The rotor profile is formed on the principle that the ellipse rolls without slipping on the base circle. On the basis of the mathematical model of the rotor profile, the paper compares the flow rate and pressure characteristics of the two blowers. The fluid dynamics analysis model was built on ANSYS software. The structural grid model is also built to increase the computational efficiency of the mathematical model. The lobes are embedded and rotated in the blower chamber. The results show that with the same radial and axial dimensions, the cylindrical lobe has a larger flow. However, the helical lobe has a more stable flow quality than the cylindrical lobe (15.2 % less flow fluctuation). In terms of pressure, the helical lobe type has a higher pressure than the cylindrical lobe type. In addition, the helical lobe type also reduces the influence of eddy currents acting on the blower chamber walls and rotors. That results in increased blower efficiency. The results of the paper will be a reliable basis for reducing time in the development of multi-lobe Roots blowers with high performanc

Non-classical properties and generation schemes of superposition of multiple-photon-added two-mode squeezed vacuum state

In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the   Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices