In recent years, predictions of damage from earthquakes have been made on a prefectural scale, and expectations exist that more detailed damage forecasts should be made even on a city/town/village scale. It is importa...In recent years, predictions of damage from earthquakes have been made on a prefectural scale, and expectations exist that more detailed damage forecasts should be made even on a city/town/village scale. It is important to know detailed ground characteristics to do damage prediction on a fine scale. Using GIS is the best way to communicate this planar disaster prevention information to the general public. Yokohama City is the second largest city in Japan and developed as part of the capital region of Metropolitan Tokyo. Recently, the population of this city has reached about 3,000,000, and economic and cultural facilities, social infrastructure, and residential complexes are concentrated in this city. The capital region, including Yokohama City, was attacked by the 1923 Great Kanto Earthquake (M7.9) and Yokohama City was devastated by this earthquake. From the research so far, it is known that the H/V spectrum obtained from microtremor observation has a good correlation with the ground characteristics. The authors have been conducting high-density tremor observations that have been ongoing since the 1990s, mainly in Kanagawa Prefecture, Japan. Here, we have organized the predominant periods obtained from the observation results for Yokohama City. The entirety of Yokohama City was divided into 250 m × 250 m meshes and their centers were used as microtremor observation sites. Excluding sites that could not be used due to geographical conditions, observations were made at approximately 5700 sites. So, we compared the data obtained separately, such as the period, terrain classification, and amplification characteristics. The distribution maps of predominant periods in Yokohama City show that the city contains a lot of artificially transformed land, and consequently, the distribution of predominant periods is not uniform. However, it can be seen that the periods become gradually longer, moving from the higher elevation eastern part toward the lower elevation western part. Investigation of the site amplification factors and detailed topographical classifications indicates a clear correlation with the predominant period distribution.展开更多
Sand dabs, an important commercial flatfish in the Bohai Sea, has recently decreased gradually in biomass, resulting from overfishing and marine pollution. Artificial culture and multiplication of sand dabs are essent...Sand dabs, an important commercial flatfish in the Bohai Sea, has recently decreased gradually in biomass, resulting from overfishing and marine pollution. Artificial culture and multiplication of sand dabs are essential and practical in China. The present paper examines the food habitof this fish to provide detailed information for its culture and multiplication.展开更多
来自日本,世界第二大的轮胎制造商 Yokohama,对于舒适、安全、宁静的追求向来相当执着,其中又以 DNA dB系列为其代表作。继消费者肯定的 ES500后,以全新合体橡胶技术研发的 DNA dB ES501即将上市。编辑部特别远征日本,在 Motegi 赛场与 ...来自日本,世界第二大的轮胎制造商 Yokohama,对于舒适、安全、宁静的追求向来相当执着,其中又以 DNA dB系列为其代表作。继消费者肯定的 ES500后,以全新合体橡胶技术研发的 DNA dB ES501即将上市。编辑部特别远征日本,在 Motegi 赛场与 Yokohama D-PARC 测试场实地检验 ES501的表现。此外,风靡 D1赛场的 AD07也在此行的测试清单之中。展开更多
Shanghai and Yokohama are very similar in the positions in their respective state economy and in the orbit of eco-nomic structure development. Since industrial districts in Yokohama city were established dozens years ...Shanghai and Yokohama are very similar in the positions in their respective state economy and in the orbit of eco-nomic structure development. Since industrial districts in Yokohama city were established dozens years earlier than Shanghai, the experience of Yokohama must be very useful for Shanghai urban planning.展开更多
Random amplified polymorphic DNA(RAPD) technique was employed to detect the DNA polymorphism in 30 individuals of natural population of Pleuronectes yokohamae.20 arbitrary primers selected from 48 primers were used an...Random amplified polymorphic DNA(RAPD) technique was employed to detect the DNA polymorphism in 30 individuals of natural population of Pleuronectes yokohamae.20 arbitrary primers selected from 48 primers were used and 148 clear,repeatable RAPD bands were generated in which 94 bands were polymorphic.All the primers are polymorphic primers.Each primer used for the detection could produce 4-13 molecular markers with the average of 7.4.DNA fingerprints vary in length from 200-2 000 bp.The percentage of polymorphic fragments was 63.51%,while the index of Shannon diversity was 0.2824 and the index of gene diversity was 0.1991.Every individual had genetic difference and the genetic distance between individuals was from 0.0148 to 0.1963.Comparing the genetic diversity of Pleuronectes yokohamaes with that of other fishes,the experiment revealed that the genetic diversity of Pleuronectes yokohamae was at middle level.This result will give data for the future study of genetic diversity in Pleuronectes yokohamae.展开更多
文摘In recent years, predictions of damage from earthquakes have been made on a prefectural scale, and expectations exist that more detailed damage forecasts should be made even on a city/town/village scale. It is important to know detailed ground characteristics to do damage prediction on a fine scale. Using GIS is the best way to communicate this planar disaster prevention information to the general public. Yokohama City is the second largest city in Japan and developed as part of the capital region of Metropolitan Tokyo. Recently, the population of this city has reached about 3,000,000, and economic and cultural facilities, social infrastructure, and residential complexes are concentrated in this city. The capital region, including Yokohama City, was attacked by the 1923 Great Kanto Earthquake (M7.9) and Yokohama City was devastated by this earthquake. From the research so far, it is known that the H/V spectrum obtained from microtremor observation has a good correlation with the ground characteristics. The authors have been conducting high-density tremor observations that have been ongoing since the 1990s, mainly in Kanagawa Prefecture, Japan. Here, we have organized the predominant periods obtained from the observation results for Yokohama City. The entirety of Yokohama City was divided into 250 m × 250 m meshes and their centers were used as microtremor observation sites. Excluding sites that could not be used due to geographical conditions, observations were made at approximately 5700 sites. So, we compared the data obtained separately, such as the period, terrain classification, and amplification characteristics. The distribution maps of predominant periods in Yokohama City show that the city contains a lot of artificially transformed land, and consequently, the distribution of predominant periods is not uniform. However, it can be seen that the periods become gradually longer, moving from the higher elevation eastern part toward the lower elevation western part. Investigation of the site amplification factors and detailed topographical classifications indicates a clear correlation with the predominant period distribution.
文摘Sand dabs, an important commercial flatfish in the Bohai Sea, has recently decreased gradually in biomass, resulting from overfishing and marine pollution. Artificial culture and multiplication of sand dabs are essential and practical in China. The present paper examines the food habitof this fish to provide detailed information for its culture and multiplication.
基金the cultural exchange program between Yokohama and Shanghai
文摘Shanghai and Yokohama are very similar in the positions in their respective state economy and in the orbit of eco-nomic structure development. Since industrial districts in Yokohama city were established dozens years earlier than Shanghai, the experience of Yokohama must be very useful for Shanghai urban planning.
文摘Random amplified polymorphic DNA(RAPD) technique was employed to detect the DNA polymorphism in 30 individuals of natural population of Pleuronectes yokohamae.20 arbitrary primers selected from 48 primers were used and 148 clear,repeatable RAPD bands were generated in which 94 bands were polymorphic.All the primers are polymorphic primers.Each primer used for the detection could produce 4-13 molecular markers with the average of 7.4.DNA fingerprints vary in length from 200-2 000 bp.The percentage of polymorphic fragments was 63.51%,while the index of Shannon diversity was 0.2824 and the index of gene diversity was 0.1991.Every individual had genetic difference and the genetic distance between individuals was from 0.0148 to 0.1963.Comparing the genetic diversity of Pleuronectes yokohamaes with that of other fishes,the experiment revealed that the genetic diversity of Pleuronectes yokohamae was at middle level.This result will give data for the future study of genetic diversity in Pleuronectes yokohamae.
