The fractionation of moderately and highly organic phosphorus (P o) in acid soil was studied by two me thods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stab...The fractionation of moderately and highly organic phosphorus (P o) in acid soil was studied by two me thods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stable P o in the soil were determined. By the second method, five constituents of precipitates of stable P o in the soil were separated, then the five precipitates were put back into the original soils and incubated for 40 d and 60 d. Then, mineralization rates of the five precipitates were determined. The same results were obtained by the two methods. When the pH of the alkali solution containing stable P o was adjusted from 3.00 to 3.10, the mineralization rate of moderately stable P o was rapidly raised. Therefore, the pH 3.00 is the critical point between moderately and highly stable P o.展开更多
Non-a-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid a...Non-a-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5% Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 ℃ to 200 ℃, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with α-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-α-tocopherols is almost 100%, and the mole yield of a-tocopherol is more than 90%.展开更多
In the process of learning a language, the language communication from the perspective of applied linguistics cannot exist without certain cultural tendency. Practice proves that an appropriate introduction of the bac...In the process of learning a language, the language communication from the perspective of applied linguistics cannot exist without certain cultural tendency. Practice proves that an appropriate introduction of the background culture having a certain relationship with language environment can enrich the knowledge structure of students, and effectively remove the obstacles in the process of English language communication, so that the cognitive ability is improved. In this paper, applied linguistics as well as the concept of cultural introduction teaching theory is briefly elaborated, and the necessities of cultural introduction teaching and the signiflcances of English cultural introduction teaching are analyzed, and also some rules necessary to follow in the introduction teaching of English culture are introduced, and then the implementation strategies are discussed, so as to provide a reference for a large number of educational workers.展开更多
As a key objective of Rethinking Education, multi-linguistic skill is becoming increasingly important for the future European workers as well as the common folks. Being able to communicate in at least one foreign lang...As a key objective of Rethinking Education, multi-linguistic skill is becoming increasingly important for the future European workers as well as the common folks. Being able to communicate in at least one foreign language is considered to be critical for the future talents against EU＇s vast linguistic diversity and increasing integration. It is widely acknowledged that language competence facilitates mobility, employability, active assimilation, as well as personal development of the individuals, especially the young people, therefore, it is given top priority in the Europe 2020 strategy for growth and employment. This paper is intended to explore the strength of the rethinking program from a linguistic perspective and offer some inspirations to domestic foreign language education reform展开更多
文摘The fractionation of moderately and highly organic phosphorus (P o) in acid soil was studied by two me thods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stable P o in the soil were determined. By the second method, five constituents of precipitates of stable P o in the soil were separated, then the five precipitates were put back into the original soils and incubated for 40 d and 60 d. Then, mineralization rates of the five precipitates were determined. The same results were obtained by the two methods. When the pH of the alkali solution containing stable P o was adjusted from 3.00 to 3.10, the mineralization rate of moderately stable P o was rapidly raised. Therefore, the pH 3.00 is the critical point between moderately and highly stable P o.
文摘Non-a-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5% Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 ℃ to 200 ℃, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with α-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-α-tocopherols is almost 100%, and the mole yield of a-tocopherol is more than 90%.
文摘In the process of learning a language, the language communication from the perspective of applied linguistics cannot exist without certain cultural tendency. Practice proves that an appropriate introduction of the background culture having a certain relationship with language environment can enrich the knowledge structure of students, and effectively remove the obstacles in the process of English language communication, so that the cognitive ability is improved. In this paper, applied linguistics as well as the concept of cultural introduction teaching theory is briefly elaborated, and the necessities of cultural introduction teaching and the signiflcances of English cultural introduction teaching are analyzed, and also some rules necessary to follow in the introduction teaching of English culture are introduced, and then the implementation strategies are discussed, so as to provide a reference for a large number of educational workers.
文摘As a key objective of Rethinking Education, multi-linguistic skill is becoming increasingly important for the future European workers as well as the common folks. Being able to communicate in at least one foreign language is considered to be critical for the future talents against EU＇s vast linguistic diversity and increasing integration. It is widely acknowledged that language competence facilitates mobility, employability, active assimilation, as well as personal development of the individuals, especially the young people, therefore, it is given top priority in the Europe 2020 strategy for growth and employment. This paper is intended to explore the strength of the rethinking program from a linguistic perspective and offer some inspirations to domestic foreign language education reform
