Abstract.A method was established for the determination of phenethanolamine A residue in milk by solid phase extraction, liquid chromatography-tandem mass spectrometry. The samples were extracted with ammonium acetate buffer solution under the condition of enzymatic hydrolysis and purified by MCX solid phase extraction column. The eluent was blown dry with nitrogen at 45℃ and dissolved with 1.0 mL 0.1% formic acid solution. The samples were isolated by Poroshell 120EC-C18, 100 mm ×3.0 mm (i.d.), 2.7 μm column, and then determined by mass spectrometry in multiple reaction monitoring mode, and quantified … Read more →

Abstract.In order to deeply implement the important content of the Central Committee of the Communist Party of China's instructions on promoting the red spirit and continuing the red bloodline, and to experience the glorious process of establishing the red political power. We conducted on-site research in Jinzhai, Anhui to explore the current situation of local red culture and tourism empowering rural revitalization and promoting economic development, gathering the power of youth and making their voices heard. The aim of this study is to explore the current situation and breakthrough directions of red … Read more →

Abstract.This study focuses on the Wuhan community and examines the significance of architectural layout in the development of healthy cities. The aim is to establish an architectural ventilation layout model conducive to reducing the risk of respiratory infectious disease transmission. By amalgamating infection occurrence of illness data and simulating environmental conditions, the effectiveness of optimized ventilation layouts in reducing transmission rates was validated. Concurrently, in conjunction with simulation outcomes, a natural ventilation architectural layout scheme conducive to mitigating … Read more →

Abstract.Fundamentals of circuit analysis is an important professional foundation course for electronics majors, the author has explored from the organization and arrangement of course content, teaching methods and means, assessment methods, experimental teaching and other aspects, and received good results. Read more →

Abstract.This paper studies the construction and practice of intelligent construction and management professional group training base under the background of the integration of on-the-job course certification and production and education. Through the in-depth analysis of the current market demand and talent training status in the field of intelligent construction and management, a training base construction mode based on the integration of post class competition certificate and production and education is proposed. This model takes the practical project as the platform, combines the theoretical … Read more →

Abstract.Radon is a natural radioactive gas widely existing, in order to study the indoor radon level and influencing factors in Kunshan City, the indoor radon concentration of three buildings was analyzed. It was found that all of them met the indoor radon concentration limit specified in the national standard, and the indoor radon concentration was mainly related to soil radon concentration, indoor ventilation and climate. Indoor radon can be controlled from the following points: (1) While building a new building, test the radon concentration in the soil and try to avoid areas with high … Read more →

Abstract.Biomass, a versatile and renewable energy source derived from organic materials, has garnered increasing attention in recent years. This review explores the multifaceted landscape of biomass energy materials research, highlighting significant progress in feedstock diversity, conversion technologies, and optimization strategies for enhanced energy yields. The comprehensive examination presented herein aims to elucidate the current state of biomass energy research, identify key challenges, and propose future directions. Read more →