With the continuous reform of the new curriculum, in the process of high school chemistry teaching, the key ability based on the discipline is an important factor in teaching which can provide a good theoretical basis...With the continuous reform of the new curriculum, in the process of high school chemistry teaching, the key ability based on the discipline is an important factor in teaching which can provide a good theoretical basis for students learning. Therefore, as high school chemistry teachers, they have more requirements for teachers. They should deeply analyze the key abilities of high school chemistry so that students can make effective progress in learning high school chemistry and formulate corresponding teaching strategies based on the key abilities. This paper mainly describes the cultivation of key abilities based on disciplines and develops effective strategies for high school chemistry education and teaching.展开更多
The Canetti-Krawczyk (CK) model is a formalism for the analysis of key-exchange protocols, which can guarantee many security properties for the protocols proved secure by this model. But we find this model lacks the a...The Canetti-Krawczyk (CK) model is a formalism for the analysis of key-exchange protocols, which can guarantee many security properties for the protocols proved secure by this model. But we find this model lacks the ability to guarantee key generation center (KGC) forward secrecy, which is an important security property for key-agreement protocols based on Identity. The essential reason leading to this weakness is that it does not fully consider the attacker's capabilities. In this paper, the CK model is accordingly extended with a new additional attacker's capability of the KGC corruption in Identity-based systems, which enables it to support KGC forward secrecy.展开更多
Given the complexity and time-consuming of the conventional environmental capacity based assessment on air environment carrying capacity; a new method for assessing urban air environment carrying capacity based on air...Given the complexity and time-consuming of the conventional environmental capacity based assessment on air environment carrying capacity; a new method for assessing urban air environment carrying capacity based on air pollution index （API） is presented. By using this new method, the air environmental beating capability of 333 cities at the prefecture level and above is assessed. The results show that of the 333 cities 9.6% is of high beating capability, 34.5% relatively high beating capability, 52.6% medium beating capability, 2.7% low capability, and 0.6% is of weak beating capability; in terms of regional distribution, the western region is of relatively high air environment bearing capability, followed by north-eastern and eastern regions, and the ambient air quality in the middle region is quite poor; among the 12 urban agglomerations in key regions, Pearl River delta, west side of Taiwan Strait and Chengdu-Chongqing agglomera- tions are of relatively high carrying capacity while other agglomerations are of medium beating capability. The assessment results imply that the existing air quality standard （GB3095-1996） is quite unsound.展开更多
文摘With the continuous reform of the new curriculum, in the process of high school chemistry teaching, the key ability based on the discipline is an important factor in teaching which can provide a good theoretical basis for students learning. Therefore, as high school chemistry teachers, they have more requirements for teachers. They should deeply analyze the key abilities of high school chemistry so that students can make effective progress in learning high school chemistry and formulate corresponding teaching strategies based on the key abilities. This paper mainly describes the cultivation of key abilities based on disciplines and develops effective strategies for high school chemistry education and teaching.
基金supported by the National Natural Science Foundation of China(Grant No.90204012)the National“863”High-tech Project of China(Grant No.2002AA143021)the Excellent Young Teachers Program of MOE,China and the Key Project of Chinese Ministry of Education
文摘The Canetti-Krawczyk (CK) model is a formalism for the analysis of key-exchange protocols, which can guarantee many security properties for the protocols proved secure by this model. But we find this model lacks the ability to guarantee key generation center (KGC) forward secrecy, which is an important security property for key-agreement protocols based on Identity. The essential reason leading to this weakness is that it does not fully consider the attacker's capabilities. In this paper, the CK model is accordingly extended with a new additional attacker's capability of the KGC corruption in Identity-based systems, which enables it to support KGC forward secrecy.
文摘Given the complexity and time-consuming of the conventional environmental capacity based assessment on air environment carrying capacity; a new method for assessing urban air environment carrying capacity based on air pollution index （API） is presented. By using this new method, the air environmental beating capability of 333 cities at the prefecture level and above is assessed. The results show that of the 333 cities 9.6% is of high beating capability, 34.5% relatively high beating capability, 52.6% medium beating capability, 2.7% low capability, and 0.6% is of weak beating capability; in terms of regional distribution, the western region is of relatively high air environment bearing capability, followed by north-eastern and eastern regions, and the ambient air quality in the middle region is quite poor; among the 12 urban agglomerations in key regions, Pearl River delta, west side of Taiwan Strait and Chengdu-Chongqing agglomera- tions are of relatively high carrying capacity while other agglomerations are of medium beating capability. The assessment results imply that the existing air quality standard （GB3095-1996） is quite unsound.
