In this paper, we used ESR dating method to measure the accumulative dose of the fossil teeth samples, which are contemporaneous with the Peking-Man. The internal annual dose rate of samples are got by neutron activat...In this paper, we used ESR dating method to measure the accumulative dose of the fossil teeth samples, which are contemporaneous with the Peking-Man. The internal annual dose rate of samples are got by neutron activation analysis and the environmental annual dose rate by highly sensitive TL dosimeters to be embedded in cave deposits in the site. The results of ESR dating are corresponded with the dating results obtained by U-series, FT, TL and paleomagnetic stratigraphical methods on the 3rd, 4th, 7th and 10th layers. Calculation of using different models, the close-equilibrium model, the linear uranium accumulation model and radon loss-linear uranium accumulation model, for travertine, deer teeth and rhinoceros tooth, we obtained the age of the First Peking- Man in the nth layer is 578 ka and gave ages of other layers, from the 1st to the 13th layer in Peking- Man site.展开更多
The man-induced sediment disaster includes material erosion, transportation and accumulation by human activities. It possesses special attribute in sociology and disaster science. In accordance with human activities, ...The man-induced sediment disaster includes material erosion, transportation and accumulation by human activities. It possesses special attribute in sociology and disaster science. In accordance with human activities, geomorphologic location, behavior and particular, the man-induced sediment disaster can be divided into 4 types: the drainage network, slope and gully, channel and plain-estuary-coastline. Each type includes erosion, transportation, accumulation, complexity and cascading. Based on human activity, geomorphology, sediment mechanics and catastrophology, the man-induced sediment disaster is characterized as follows: (1) accelerating tendency with geographical zoning back-ground; (2) non-order characters by blind action without special technical training; (3) gradually and sharply changing with human environment vibration; and (4) complexity and non-linear figure, etc. One of the reasons leading to man-induced sediment disaster is human environment vibration.展开更多
Zhao Guoxin has the future all mapped out.First,he intends to turn the center into a full-time industry as a Sino-foreign joint venture com-plete with two pharmaceutical plants and a 200-bed hospital for coronary hear...Zhao Guoxin has the future all mapped out.First,he intends to turn the center into a full-time industry as a Sino-foreign joint venture com-plete with two pharmaceutical plants and a 200-bed hospital for coronary heart patients.This,he thinks,should take about three years.展开更多
Pearl Carlson was shaken awake at 3:30 a. m.by an urgent tugging. King, the family dog,was trying to pull her out of bed.Then she smelled smoke and heard the crackle of flames engulfing her parents’ home. Pearl’s sc...Pearl Carlson was shaken awake at 3:30 a. m.by an urgent tugging. King, the family dog,was trying to pull her out of bed.Then she smelled smoke and heard the crackle of flames engulfing her parents’ home. Pearl’s screams roused her mother, Fern, and father,Howard, who had recently been hospitalized for lung disease.Helping Howard to a first-floor window, Fern told him to climb out,then ran to her daughter.The two escaped through展开更多
Since the discovery of oceanic manganese nodules during the expedition of the British ocean-going ship Challenger from 1872 to 1876, research and development for seabed manganese nodules have never ceased owing to the...Since the discovery of oceanic manganese nodules during the expedition of the British ocean-going ship Challenger from 1872 to 1876, research and development for seabed manganese nodules have never ceased owing to the huge economic inducements. Manganese nodules are the black or dark brown, spherical or massive Mn-bearing ores, deposits of which are found on the sea bottom. The nodules are a mixture of silicate and insoluble potassium permanganates （also with sub-Ti, Fe and Na permanganates） that contain more than 30 kinds of metallic elements, among which those of greatest economic interest are Mn （27-30%）, Ni（1.25-1.5%）, Cu（1- 1.4%）, Co（0.2- 0.25 %）, Fe, Si, and AI, with minor amounts of Ca, Na, K, Ti, B, H and O.展开更多
The LM-2F launch vehicle is China's first launch carrier developed for China's Manned Space Program,which is one of the most important parts of the Program.It is developed from the LM-2E launch vehicle,with ad...The LM-2F launch vehicle is China's first launch carrier developed for China's Manned Space Program,which is one of the most important parts of the Program.It is developed from the LM-2E launch vehicle,with addition of two new systems,an escape system and a fault detection system.展开更多
The fourth CAST Space Technology Forum was held on November 29, 2012 with the theme of Progress of China's Manned Space Station Project. Scientists, experts and government officials gathered to discuss the scheme,...The fourth CAST Space Technology Forum was held on November 29, 2012 with the theme of Progress of China's Manned Space Station Project. Scientists, experts and government officials gathered to discuss the scheme, technical issues of the project, which consists of thirteen systems. CASC is in charge of the construction of seven systems through its subsidiaries. CALT is assigned to the building of LM-2F, LM-5 and LM-7 launch vehicles and CAST is assigned to the R&D of a space laboratory,展开更多
NAN Rendong,a distinguished expert in radio astronomy who is known as the father of the world’s largest radio telescope,died from lung cancer in Boston on September 15,2017 at the age of 72.His untimely passing away ...NAN Rendong,a distinguished expert in radio astronomy who is known as the father of the world’s largest radio telescope,died from lung cancer in Boston on September 15,2017 at the age of 72.His untimely passing away was just ten days before his masterpiece,the Five-hundred-meter Aperture Spherical radio Telescope(FAST),which he spent over two decades conceiving and building for the next generation展开更多
There is no-one in the field of weather broadcasting in Tibet who does notknow about Gyila: Top 10 Youth of China, China’s Outstanding Scientist, winner of the 5th China Youth Scientific Progress, and winner of first...There is no-one in the field of weather broadcasting in Tibet who does notknow about Gyila: Top 10 Youth of China, China’s Outstanding Scientist, winner of the 5th China Youth Scientific Progress, and winner of first May 4th Medal for Tibetan Youths.What people tell of him are legendary stories. Actually, he is an ordinary man who has cut a brilliant figure in work.展开更多
Fish passage is important to the overall health of an ecosystem. Therefore, it is important to be able to accurately predict flow conditions within a stream crossing for high and low flow periods. This paper evaluates...Fish passage is important to the overall health of an ecosystem. Therefore, it is important to be able to accurately predict flow conditions within a stream crossing for high and low flow periods. This paper evaluates the effect of relative water depth on the hydraulic roughness of culverts at low discharge. A 21 m long, 0.8 m diameter corrugated steel pipe with 0.068 × 0.013 m annular corrugations was used. For relative depths below 0.5, Manning’s n was found to increase with decreasing relative depth. An equation was developed to predict relative depths below 0.5 within a corrugated steel pipe based on the corrugation height, slope and culvert diameter. While Manning’s equation does perform reasonably well, the percent difference from the measured to predicted water levels warrants the use of an additional prediction method at low flows.展开更多
恶妇杀夫,竟将尸体藏匿于冰箱之中,5年之后,其劣迹方才败露！消息首句系十足的主题句(topic sentence)。此句值得学习的是其定语从句,whohad been missing for five years,它被置于状语从句的主语和谓语之间。这种“插入”形式,为初学...恶妇杀夫,竟将尸体藏匿于冰箱之中,5年之后,其劣迹方才败露！消息首句系十足的主题句(topic sentence)。此句值得学习的是其定语从句,whohad been missing for five years,它被置于状语从句的主语和谓语之间。这种“插入”形式,为初学者所不能。初学者往往将该句写成:...after the body of herhusband was found in a discarded freezer who have been missing for five years.须知:定语从句应紧挨其修饰的成以免引起误解。这在语言学上称就近原则(vicinity principle)展开更多
According to the statistics of China National Commerce Information Center, the man’s wear sales of major retailers rose 28.92% year over year in first three months of 2010. The growth rate was 5.36 percentage
The notorious (声名狼藉的) cheap skate (吝啬鬼) finally decided to have a party.Explanining to a friend how to find his apartment(公寓),he said,“Come up to 5M and ring the
“狗咬人”虽不是新闻。但是整个故事都围绕着被咬者的耳朵展开。一波三折,让人关注。作者蕴幽默于不动声色的行文中。非常耐读。比如:The dog survived, but the ear didn't. When it finally reached the hospital four hours aft...“狗咬人”虽不是新闻。但是整个故事都围绕着被咬者的耳朵展开。一波三折,让人关注。作者蕴幽默于不动声色的行文中。非常耐读。比如:The dog survived, but the ear didn't. When it finally reached the hospital four hours after being chewed off, it was no longer in any condition to be stitched back on. 动词survived值得读者玩味,而且。When it finally reached the hospital…一句的中的主语it,不是别的而是the ear!我们汉语就不能直译,如译:当耳朵来到医院的时候……】展开更多
文摘In this paper, we used ESR dating method to measure the accumulative dose of the fossil teeth samples, which are contemporaneous with the Peking-Man. The internal annual dose rate of samples are got by neutron activation analysis and the environmental annual dose rate by highly sensitive TL dosimeters to be embedded in cave deposits in the site. The results of ESR dating are corresponded with the dating results obtained by U-series, FT, TL and paleomagnetic stratigraphical methods on the 3rd, 4th, 7th and 10th layers. Calculation of using different models, the close-equilibrium model, the linear uranium accumulation model and radon loss-linear uranium accumulation model, for travertine, deer teeth and rhinoceros tooth, we obtained the age of the First Peking- Man in the nth layer is 578 ka and gave ages of other layers, from the 1st to the 13th layer in Peking- Man site.
基金Joint project by National Natural Science Foundation of China and the Ministry of Water Resources,No.59890200National Natural Science Foundation of China, No.48870008
文摘The man-induced sediment disaster includes material erosion, transportation and accumulation by human activities. It possesses special attribute in sociology and disaster science. In accordance with human activities, geomorphologic location, behavior and particular, the man-induced sediment disaster can be divided into 4 types: the drainage network, slope and gully, channel and plain-estuary-coastline. Each type includes erosion, transportation, accumulation, complexity and cascading. Based on human activity, geomorphology, sediment mechanics and catastrophology, the man-induced sediment disaster is characterized as follows: (1) accelerating tendency with geographical zoning back-ground; (2) non-order characters by blind action without special technical training; (3) gradually and sharply changing with human environment vibration; and (4) complexity and non-linear figure, etc. One of the reasons leading to man-induced sediment disaster is human environment vibration.
文摘Zhao Guoxin has the future all mapped out.First,he intends to turn the center into a full-time industry as a Sino-foreign joint venture com-plete with two pharmaceutical plants and a 200-bed hospital for coronary heart patients.This,he thinks,should take about three years.
文摘Pearl Carlson was shaken awake at 3:30 a. m.by an urgent tugging. King, the family dog,was trying to pull her out of bed.Then she smelled smoke and heard the crackle of flames engulfing her parents’ home. Pearl’s screams roused her mother, Fern, and father,Howard, who had recently been hospitalized for lung disease.Helping Howard to a first-floor window, Fern told him to climb out,then ran to her daughter.The two escaped through
文摘Since the discovery of oceanic manganese nodules during the expedition of the British ocean-going ship Challenger from 1872 to 1876, research and development for seabed manganese nodules have never ceased owing to the huge economic inducements. Manganese nodules are the black or dark brown, spherical or massive Mn-bearing ores, deposits of which are found on the sea bottom. The nodules are a mixture of silicate and insoluble potassium permanganates （also with sub-Ti, Fe and Na permanganates） that contain more than 30 kinds of metallic elements, among which those of greatest economic interest are Mn （27-30%）, Ni（1.25-1.5%）, Cu（1- 1.4%）, Co（0.2- 0.25 %）, Fe, Si, and AI, with minor amounts of Ca, Na, K, Ti, B, H and O.
文摘The LM-2F launch vehicle is China's first launch carrier developed for China's Manned Space Program,which is one of the most important parts of the Program.It is developed from the LM-2E launch vehicle,with addition of two new systems,an escape system and a fault detection system.
文摘The fourth CAST Space Technology Forum was held on November 29, 2012 with the theme of Progress of China's Manned Space Station Project. Scientists, experts and government officials gathered to discuss the scheme, technical issues of the project, which consists of thirteen systems. CASC is in charge of the construction of seven systems through its subsidiaries. CALT is assigned to the building of LM-2F, LM-5 and LM-7 launch vehicles and CAST is assigned to the R&D of a space laboratory,
文摘NAN Rendong,a distinguished expert in radio astronomy who is known as the father of the world’s largest radio telescope,died from lung cancer in Boston on September 15,2017 at the age of 72.His untimely passing away was just ten days before his masterpiece,the Five-hundred-meter Aperture Spherical radio Telescope(FAST),which he spent over two decades conceiving and building for the next generation
文摘There is no-one in the field of weather broadcasting in Tibet who does notknow about Gyila: Top 10 Youth of China, China’s Outstanding Scientist, winner of the 5th China Youth Scientific Progress, and winner of first May 4th Medal for Tibetan Youths.What people tell of him are legendary stories. Actually, he is an ordinary man who has cut a brilliant figure in work.
文摘Fish passage is important to the overall health of an ecosystem. Therefore, it is important to be able to accurately predict flow conditions within a stream crossing for high and low flow periods. This paper evaluates the effect of relative water depth on the hydraulic roughness of culverts at low discharge. A 21 m long, 0.8 m diameter corrugated steel pipe with 0.068 × 0.013 m annular corrugations was used. For relative depths below 0.5, Manning’s n was found to increase with decreasing relative depth. An equation was developed to predict relative depths below 0.5 within a corrugated steel pipe based on the corrugation height, slope and culvert diameter. While Manning’s equation does perform reasonably well, the percent difference from the measured to predicted water levels warrants the use of an additional prediction method at low flows.
文摘恶妇杀夫,竟将尸体藏匿于冰箱之中,5年之后,其劣迹方才败露！消息首句系十足的主题句(topic sentence)。此句值得学习的是其定语从句,whohad been missing for five years,它被置于状语从句的主语和谓语之间。这种“插入”形式,为初学者所不能。初学者往往将该句写成:...after the body of herhusband was found in a discarded freezer who have been missing for five years.须知:定语从句应紧挨其修饰的成以免引起误解。这在语言学上称就近原则(vicinity principle)
文摘According to the statistics of China National Commerce Information Center, the man’s wear sales of major retailers rose 28.92% year over year in first three months of 2010. The growth rate was 5.36 percentage
文摘The notorious (声名狼藉的) cheap skate (吝啬鬼) finally decided to have a party.Explanining to a friend how to find his apartment(公寓),he said,“Come up to 5M and ring the
文摘“狗咬人”虽不是新闻。但是整个故事都围绕着被咬者的耳朵展开。一波三折,让人关注。作者蕴幽默于不动声色的行文中。非常耐读。比如:The dog survived, but the ear didn't. When it finally reached the hospital four hours after being chewed off, it was no longer in any condition to be stitched back on. 动词survived值得读者玩味,而且。When it finally reached the hospital…一句的中的主语it,不是别的而是the ear!我们汉语就不能直译,如译:当耳朵来到医院的时候……】
