Post-stroke Antihypertensive Treatment Study (PATS) was a randomized, double-blind and placebo-controlled trial, which aimed at determining whether antihypertensive treatment could reduce the risk of fatal and nonfata...Post-stroke Antihypertensive Treatment Study (PATS) was a randomized, double-blind and placebo-controlled trial, which aimed at determining whether antihypertensive treatment could reduce the risk of fatal and nonfatal stroke incidence in patients with a history of stroke or transient ischemic attack (TLA). 5 665 patients were randomized by a sealed envelope system. Systolic blood pressure (SBP) ranged from 80 to 280 mm Hg and diastolic (DBP) from 50 to 150 mmHg. The average SBP was 154 mmHg and average DBP 93 mmHg. The mean age was 60 years. Among the patients, women accounted for 28%. In 71% the latest stroke was ischemic. Average follow-up approximated to 2 years. The three-year average SBP was 149 mmHg for the placebo group and 144 mmHg for the indapamide treatment group, and the three-year DBP was 89 mmHg and 87 mmHg respectively. The three-year first incidence of fatal and nonfatal stroke was 12.3 per 100 patients placebo treatment and 9.4 per 100 with indapamide. The relative risk by proportional hazards regression analysis was 0.71 (P=0.0009). For deaths from all causes, the relative risk was 0.91. (P>0.05). The findings of this trial indicate that in patients with a history of stroke or TLA, blood pressure reduction of 5 / 2 mmHg with 2.5 mg indapamide reduced the first incidence of fatal and nonfatal stroke by 29%, with three-year absolute benefit of 29 events per 1000 participants.展开更多
Rice is the staple food for more than half of the world＇s population and for more than 60% of China population. Increasing rice yield is therefore crucial for solving food shortage problem, ensuring food secruity, an...Rice is the staple food for more than half of the world＇s population and for more than 60% of China population. Increasing rice yield is therefore crucial for solving food shortage problem, ensuring food secruity, and reducing poverty. Given the vast population and limited per capita cultivated land in China, meeting food demands by increasing the yield per unit area with the aid of advanced sciences and technologies would be the only option. Several alternative measures for increasing crop yield, such as building water conservancy facilities, increasing fertilizer application, improving soil texture, forming interrelated cultivation techniques, more effective controlling of pests and diseases, and using of elite varieties, have been undertaken. Among these alternative measures, adopting elite varieties, particularly popularizing super hybrid rice, proves to be the most economical and effective option.展开更多
Sepsis and subsequent multiple organ dysfunction syndrome(MODS) are frequent complications after severe traumata or burns involving a large area,and these remain as the two most common causes of morbidity and mortalit...Sepsis and subsequent multiple organ dysfunction syndrome(MODS) are frequent complications after severe traumata or burns involving a large area,and these remain as the two most common causes of morbidity and mortality in critical illnesses.Despite the recent rapid advances in intensive展开更多
Rice is a staple food for more than half of the human population.It has been estimated that by 2030,40%more rice needs to be produced in order to meet the growing demand（Khush,2005）.One of the strategies to improve ...Rice is a staple food for more than half of the human population.It has been estimated that by 2030,40%more rice needs to be produced in order to meet the growing demand（Khush,2005）.One of the strategies to improve rice productivity is to enlarge rice growth areas, such as the northward expansion of the growth region in Heilongjiang Province, the northernmost region of China （Li et al., 2015）. However, the northward cultivation is accompanied with daylength extension and temperature decrease, which are unfavor- able for rice, a tropical short-day plant, to complete flowering and seed setting. Thus, the need for early-maturing rice cultivars with extremely low photoperiod sensitivity is urgent.展开更多
The Xuecheng site lies at Xuesi village of Xuecheng township, Gaochun county, Nanjing city, Jiangsu province, on the southern shore of the Shijiu Lake. It was excavated in 1997, which resulted in the revelation of 115...The Xuecheng site lies at Xuesi village of Xuecheng township, Gaochun county, Nanjing city, Jiangsu province, on the southern shore of the Shijiu Lake. It was excavated in 1997, which resulted in the revelation of 115 Neolithic tombs and many ash-pits, house-foundations and fireplaces and the discovery of pottery, jade, stone and bone artifacts and quantities of animal remains. The cultural deposits can he divided into the upper, middle and lower layers, which are all simple in cultural content and represent the late, middle and upper phases respectively. The cultural aspect shows strong regional features distinctly different from the contemporary cultures of adjacent areas, which suggests that the remains can he named “Xuecheng cultural type. ” Chronologically, the early phase roughly corresponds to the middle and late Majiahang culture, the middle phase to the second period of Beiyinyangying culture or a little earlier than it, and the late phase to the middle and late Songze culture.展开更多
In underwater optical wireless communication(UOWC),a channel is characterized by abundant scattering/absorption effects and optical turbulence.Most previous studies on UOWC have been limited to scattering/absorption e...In underwater optical wireless communication(UOWC),a channel is characterized by abundant scattering/absorption effects and optical turbulence.Most previous studies on UOWC have been limited to scattering/absorption effects.However,experiments in the literature indicate that underwater optical turbulence(UOT)can cause severe degradation of UOWC performance.In this paper,we characterize an UOWC channel with both scattering/absorption and UOT taken into consideration,and a spatial diversity receiver scheme,say a singleinput–multiple-output(SIMO) scheme,based on a light-emitting-diode(LED) source and multiple detectors is proposed to mitigate deep fading.The Monte Carlo based statistical simulation method is introduced to evaluate the bit-error-rate performance of the system.It is shown that spatial diversity can effectively reduce channel fading and remarkably extend communication range.展开更多
In the early morning of April 14th, 2010, a strong earth- quake (Ms7.1, http://www.csndmc.ac.cn; Mw6.9, http://neic. usgs.gov) occurred in Yushu district, Qinghai Province, China. More than 2000 lives were lost and ov...In the early morning of April 14th, 2010, a strong earth- quake (Ms7.1, http://www.csndmc.ac.cn; Mw6.9, http://neic. usgs.gov) occurred in Yushu district, Qinghai Province, China. More than 2000 lives were lost and over 100000 injured,展开更多
In this new age of scientific developments, biomedicine makes it possible for us to draw precise pictures of the internal workings of the human body, measure tiny metabolic reactions,exchange organs from one person to...In this new age of scientific developments, biomedicine makes it possible for us to draw precise pictures of the internal workings of the human body, measure tiny metabolic reactions,exchange organs from one person to another,and even grow babies in test tubes.These accomplishments have enabled us to alter successfully and dramatically the natural history of many diseases.Nobody can detract from these achievements, and it is a matter of course for biomedicine to be regarded as conventional medicine or mainstream medicine.However,biomedicine is at its limits nowadays展开更多
This paper describes a numerical model of the world ocean based on the fully primitive equations. A 'Standard' ocean state is introduced into the equations of the model and the perturbed thermodynamic variable...This paper describes a numerical model of the world ocean based on the fully primitive equations. A 'Standard' ocean state is introduced into the equations of the model and the perturbed thermodynamic variables are used in the modlc's calculations. Both a free upper surface and a bottom topography are included in the model and a sigma coordinate is used to normalize the model's vertical component. The model has four unevenly-spaced layers and 4 × 5 horizontal resolution based on C-grid system. The finite-difference scheme of the model is designed to conserve the gross available energy in order to avoid fictitious energy generation or decay.The model has been tested in response to the annual mean surface wind stress, sea level air pressure and sea level air temperature as a preliminary step to its further improvement and its coupling with a global atmospheric general circulation model. Some of results, including currents, temperature and sea surface elevation simulated by the mode! arc presented.展开更多
A rescuing archaeological excavation in Area H of the Hutian kiln-site was carried out in July-October 1999 by the Jiangxi Provincial Institute of Cultural Relics and Archaeology. The work covered an area of more than...A rescuing archaeological excavation in Area H of the Hutian kiln-site was carried out in July-October 1999 by the Jiangxi Provincial Institute of Cultural Relics and Archaeology. The work covered an area of more than 1,300 sq m, revealed 11 spots of house-foundation, well, small yard,clay-refining pool and ash-pit remains, and discovered above 600 intact and restorable articles of greenish-white-glazed, egg-white-glazed, black-glazed and blue-and-white porcelain wares from the Song, Yuan and Ming periods. The excavation clarified relatively direct stratigraphic evidence on the typological evolution of the vessels typical of the Song and Yuan periods and threw light on a batch of egg-white-glazed “shu fu” porcelain objects of the early Yuan and some inscribed porcelain-making implements.展开更多
On the lacquered eared-cup unearthed in 1995 from the No. 1 Chu tomb at Guodian, Jingmen, Hubei, there is the inscription “Donggong zhi shi 东宫之币.” Among the characters the “donggong” must refer to the crown pr...On the lacquered eared-cup unearthed in 1995 from the No. 1 Chu tomb at Guodian, Jingmen, Hubei, there is the inscription “Donggong zhi shi 东宫之币.” Among the characters the “donggong” must refer to the crown prince of the Chu state, and the last character, in the light of the characteristics and evolutionary laws of similar phrases in inscriptions on oracle bones and bronzes as well as in those of the Eastern Zhou period, should be deciphered as the word “teacher.” So the whole inscription means the teacher of the Chu crown prince. It can further be inferred that the owner of the tomb might have been the Chu crown prince's teacher, the documents from there were teaching material for the prince, and the tomb and bamboo slips go back to a time earlier than 303 BC.展开更多
The paper analyzes both the progress and problems in the western China developmentdrive over the past three years and attempts a tentative evaluation of the results of the drive.The authors hold that the western China...The paper analyzes both the progress and problems in the western China developmentdrive over the past three years and attempts a tentative evaluation of the results of the drive.The authors hold that the western China development drive has been proceeding in anactive, orderly and steady fashion, and has achieved considerable success in the constructionof infrastructure, and improvement of ecological environment. However, there are stillmany problems. It has been slow in attracting non-governmental investment, in theimprovement of investment climate, regional industrialization and in opening up to theoutside world. It is, therefore, necessary to make adjustments to the western Chinadevelopment strategy during the remaining years of the Tenth Five-Year Plan period (2001-2005) and during the Eleventh Five-Year Plan period (2006-2010), make greater efforts inreform and opening up, improve the investment climate, accelerate the pace of industrializationand attract more non-governmental capital from at home and abroad.展开更多
Tunable diode laser absorption spectroscopy （TDLAS） has been widely employed in atmospheric trace gases detection. In the measurement of these trace gases, harmonic detection combined with a multi-pass white cell co...Tunable diode laser absorption spectroscopy （TDLAS） has been widely employed in atmospheric trace gases detection. In the measurement of these trace gases, harmonic detection combined with a multi-pass white cell could remarkably enhance the detection sensitivity. In this paper, a portable TDLAS system built specifically for long time monitoring methane in the atmosphere is introduced. The detection limit is below 100 ppb that is enough for the monitoring of ambient methane, and the long time monitoring results obtained in Beijing are given, which is well coincident with that of the Fourier transform infrared （FTIR） spectroscopy.展开更多
The reform of the housing system in Shanghai has unexpectedly given rise to a self-governed property owners’ collective supervisory system, primarily in the form of Property Owners’ Supervisory Council (POSC), which...The reform of the housing system in Shanghai has unexpectedly given rise to a self-governed property owners’ collective supervisory system, primarily in the form of Property Owners’ Supervisory Council (POSC), which has picked up some of the government’s administrative functions. Although this new, institutionalized management model has theoretically made democratic managerial participation at the grassroots level possible, it has brought about endless problems, overt and covert, shortly after its appearance, some of which are even alarming. A comprehensive analysis of the data collected over a long period of time has led to the conclusion that this system is a failure, attributable to the overt factor related to skills in reality and the covert “priori” factor that is masked by the former. The existence of such “priori” factor once again demonstrates the deep-rooted, traditional managerial logic: Positive operations is society need only to depend upon individuals’ unstable self-disciplined morality rather than to build a system. The current paper points out that any change in the socioeconomic structure that has long been subject to the power of politics is to inevitably incur a corresponding global structural accommodation, including politics itself. To respond to the two factors for the failure, system building in the two overlapping areas is a must.展开更多
Obesity is recognized as the second highest risk factor for cancer. The pathogenic mechanisms underlying tobaccorelated cancers are well characterized and efective programs have led to a decline in smoking and related...Obesity is recognized as the second highest risk factor for cancer. The pathogenic mechanisms underlying tobaccorelated cancers are well characterized and efective programs have led to a decline in smoking and related cancers, but there is a global epidemic of obesity without a clear understanding of how obesity causes cancer. Obesity is heterogeneous, and approximately 25% of obese individuals remain healthy(metabolically healthy obese, MHO), so which fat deposition(subcutaneous versus visceral, adipose versus ectopic) is "malignant"? What is the mechanism of carcinogenesis? Is it by metabolic dysregulation or chronic inflammation? Through which chemokines/genes/signaling pathways does adipose tissue influence carcinogenesis? Can selective inhibition of these pathways uncouple obesity from cancers? Do all obesity related cancers(ORCs) share a molecular signature? Are there common(overlapping) genetic loci that make individuals susceptible to obesity, metabolic syndrome, and cancers? Can we identify precursor lesions of ORCs and will early intervention of high risk individuals alter the natural history? It appears unlikely that the obesity epidemic will be controlled anytime soon; answers to these questions will help to reduce the adverse efect of obesity on human condition.展开更多
A nation-wide survey of blood pressure (BP) and high BP was made in China in 1991, using standardized methods and covering 950 356 men and women aged 15 years and above, from 30 provinces, autonomous regions, and muni...A nation-wide survey of blood pressure (BP) and high BP was made in China in 1991, using standardized methods and covering 950 356 men and women aged 15 years and above, from 30 provinces, autonomous regions, and municipalities. The purpose of the study was to estimate the prevalence and the status of awareness, treatment, and control of hypertension. The overall prevalence rate of hypertension defined as systolic BP> 140 or diastolic BP> 90 mmHg or currently on antihypertensive medication was 13.6%, and was higher in urban (16.3%) than in rural (11.1%) setting. The rate was 6.6% if a BP cut-point of 160 / 95 mmHg was used. Rates were low in younger age-groups but rose sharply after age 45. The total number of hypertensives in 1990 was estimated to be close to 90 millions. Of all hypertensives, about 1/4 were aware of their high BP, half of these were on medication, and only 3% had their BP controlled. All the rates were higher if the BP cut-point was 160 / 95 mmHg. Higher rates were found in urban than rural setting and, to a lesser degree, for women than men. In conclusion, hypertension was found to be common in China, and the rates of awareness, drug treatment, and controlled BP were low, indicating an urgent need for developing a national program of treatment and prevention of high BP.展开更多
Aortic dissection is a life-threatening disease that can produce a variety of symptoms and complications. Patients at high risk for mortality, such as individuals with aortic regurgitation, cardiac tamponade, or myoca...Aortic dissection is a life-threatening disease that can produce a variety of symptoms and complications. Patients at high risk for mortality, such as individuals with aortic regurgitation, cardiac tamponade, or myocardial infarction, should be treated by surgery as soon as possible, especially in cases with acute ascending aortic dissections （Stanford type A）. However, patients with aortic dissection may suffer adverse outcomes that lead to mortality and morbidity, such as stoke, re-dissection, myocardial infarction, and heart failure. Patients with surgically treated acute type A aortic dissection show an 18.2% likelihood of stroke in early morbidity.展开更多
In this paper, the conversion of CO2/CH4 by using pulse corona plasma was studied at atmospheric pressure and ambient temperature. The effects of ratio of CO2/CH4, pulse voltage and repeated frequency of plasma discha...In this paper, the conversion of CO2/CH4 by using pulse corona plasma was studied at atmospheric pressure and ambient temperature. The effects of ratio of CO2/CH4, pulse voltage and repeated frequency of plasma discharge were first studied in the system.展开更多
Research shows teachers’speaking less so involvesstudents more.So English teacher talk determines tosome extent whether the teaching is successful or not.After giving a brief introduction to teacher talk inEnglish cl...Research shows teachers’speaking less so involvesstudents more.So English teacher talk determines tosome extent whether the teaching is successful or not.After giving a brief introduction to teacher talk inEnglish class,this paper analyzes the possible factorsthat affect teacher talk.It then suggests some im-provements of teacher talk in order to better our teach-ing methodology.展开更多
Over the past several decades, great endeavors have been devoted to superhard materials research, among which two topics are of central focus. One is to understand hardness microscopically and reveal the controlling f...Over the past several decades, great endeavors have been devoted to superhard materials research, among which two topics are of central focus. One is to understand hardness microscopically and reveal the controlling factors for superhardness, which can be used to guide the design of novel superhard crystals;the other is to synthesize superhard materials with enhanced comprehensive performance(i.e., hardness, fracture toughness,and thermal stability), with the ambition to synthesize materials harder than natural diamond. We proposed a microscopic understanding of the indentation hardness as the combined resistance of chemical bonds in a material to indentation, and established a microscopic hardness model for covalent and polar covalent crystals, which was further generalized to polycrystalline materials. Guided by the polycrystalline hardness model, we successfully synthesized nanotwinned cubic boron nitride and diamond bulks under high pressure and high temperature. These materials exhibit simultaneous improvement of hardness, fracture toughness, and thermal stability, designating a new direction for superhard materials research.展开更多
文摘Post-stroke Antihypertensive Treatment Study (PATS) was a randomized, double-blind and placebo-controlled trial, which aimed at determining whether antihypertensive treatment could reduce the risk of fatal and nonfatal stroke incidence in patients with a history of stroke or transient ischemic attack (TLA). 5 665 patients were randomized by a sealed envelope system. Systolic blood pressure (SBP) ranged from 80 to 280 mm Hg and diastolic (DBP) from 50 to 150 mmHg. The average SBP was 154 mmHg and average DBP 93 mmHg. The mean age was 60 years. Among the patients, women accounted for 28%. In 71% the latest stroke was ischemic. Average follow-up approximated to 2 years. The three-year average SBP was 149 mmHg for the placebo group and 144 mmHg for the indapamide treatment group, and the three-year DBP was 89 mmHg and 87 mmHg respectively. The three-year first incidence of fatal and nonfatal stroke was 12.3 per 100 patients placebo treatment and 9.4 per 100 with indapamide. The relative risk by proportional hazards regression analysis was 0.71 (P=0.0009). For deaths from all causes, the relative risk was 0.91. (P>0.05). The findings of this trial indicate that in patients with a history of stroke or TLA, blood pressure reduction of 5 / 2 mmHg with 2.5 mg indapamide reduced the first incidence of fatal and nonfatal stroke by 29%, with three-year absolute benefit of 29 events per 1000 participants.
文摘Rice is the staple food for more than half of the world＇s population and for more than 60% of China population. Increasing rice yield is therefore crucial for solving food shortage problem, ensuring food secruity, and reducing poverty. Given the vast population and limited per capita cultivated land in China, meeting food demands by increasing the yield per unit area with the aid of advanced sciences and technologies would be the only option. Several alternative measures for increasing crop yield, such as building water conservancy facilities, increasing fertilizer application, improving soil texture, forming interrelated cultivation techniques, more effective controlling of pests and diseases, and using of elite varieties, have been undertaken. Among these alternative measures, adopting elite varieties, particularly popularizing super hybrid rice, proves to be the most economical and effective option.
基金Supported,in part,by Grants from the National Basic Research Program of China(No.2005CB522602)National Natural Science Foundation of China(No.30672178,30872683,30800437)National Natural Science Outstanding Youth Foundation of China(No.30125020)
文摘Sepsis and subsequent multiple organ dysfunction syndrome(MODS) are frequent complications after severe traumata or burns involving a large area,and these remain as the two most common causes of morbidity and mortality in critical illnesses.Despite the recent rapid advances in intensive
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA08040101)the Hundred Talents Program of Chinese Academy of Sciences to Q.Y. Bu+1 种基金the Natural Science Foundation of Heilongjiang (No.ZD2015005)Excellent Academic Leaders of Harbin (No.RC2014XK002003)
文摘Rice is a staple food for more than half of the human population.It has been estimated that by 2030,40%more rice needs to be produced in order to meet the growing demand（Khush,2005）.One of the strategies to improve rice productivity is to enlarge rice growth areas, such as the northward expansion of the growth region in Heilongjiang Province, the northernmost region of China （Li et al., 2015）. However, the northward cultivation is accompanied with daylength extension and temperature decrease, which are unfavor- able for rice, a tropical short-day plant, to complete flowering and seed setting. Thus, the need for early-maturing rice cultivars with extremely low photoperiod sensitivity is urgent.
文摘The Xuecheng site lies at Xuesi village of Xuecheng township, Gaochun county, Nanjing city, Jiangsu province, on the southern shore of the Shijiu Lake. It was excavated in 1997, which resulted in the revelation of 115 Neolithic tombs and many ash-pits, house-foundations and fireplaces and the discovery of pottery, jade, stone and bone artifacts and quantities of animal remains. The cultural deposits can he divided into the upper, middle and lower layers, which are all simple in cultural content and represent the late, middle and upper phases respectively. The cultural aspect shows strong regional features distinctly different from the contemporary cultures of adjacent areas, which suggests that the remains can he named “Xuecheng cultural type. ” Chronologically, the early phase roughly corresponds to the middle and late Majiahang culture, the middle phase to the second period of Beiyinyangying culture or a little earlier than it, and the late phase to the middle and late Songze culture.
基金supported by the National Key Basic Research Program of China (Grant No.2013CB329201)the National Natural Science Foundation of China (Grant Nos.61171066 and 61471332)the State Key Laboratory of Robotics
文摘In underwater optical wireless communication(UOWC),a channel is characterized by abundant scattering/absorption effects and optical turbulence.Most previous studies on UOWC have been limited to scattering/absorption effects.However,experiments in the literature indicate that underwater optical turbulence(UOT)can cause severe degradation of UOWC performance.In this paper,we characterize an UOWC channel with both scattering/absorption and UOT taken into consideration,and a spatial diversity receiver scheme,say a singleinput–multiple-output(SIMO) scheme,based on a light-emitting-diode(LED) source and multiple detectors is proposed to mitigate deep fading.The Monte Carlo based statistical simulation method is introduced to evaluate the bit-error-rate performance of the system.It is shown that spatial diversity can effectively reduce channel fading and remarkably extend communication range.
基金supported by Chinese Academy of Science Fund (Grant No. KZCX2-YW-116-1)China Earthquake Administration Fund (Grant No. 200808078)
文摘In the early morning of April 14th, 2010, a strong earth- quake (Ms7.1, http://www.csndmc.ac.cn; Mw6.9, http://neic. usgs.gov) occurred in Yushu district, Qinghai Province, China. More than 2000 lives were lost and over 100000 injured,
文摘In this new age of scientific developments, biomedicine makes it possible for us to draw precise pictures of the internal workings of the human body, measure tiny metabolic reactions,exchange organs from one person to another,and even grow babies in test tubes.These accomplishments have enabled us to alter successfully and dramatically the natural history of many diseases.Nobody can detract from these achievements, and it is a matter of course for biomedicine to be regarded as conventional medicine or mainstream medicine.However,biomedicine is at its limits nowadays
文摘This paper describes a numerical model of the world ocean based on the fully primitive equations. A 'Standard' ocean state is introduced into the equations of the model and the perturbed thermodynamic variables are used in the modlc's calculations. Both a free upper surface and a bottom topography are included in the model and a sigma coordinate is used to normalize the model's vertical component. The model has four unevenly-spaced layers and 4 × 5 horizontal resolution based on C-grid system. The finite-difference scheme of the model is designed to conserve the gross available energy in order to avoid fictitious energy generation or decay.The model has been tested in response to the annual mean surface wind stress, sea level air pressure and sea level air temperature as a preliminary step to its further improvement and its coupling with a global atmospheric general circulation model. Some of results, including currents, temperature and sea surface elevation simulated by the mode! arc presented.
文摘A rescuing archaeological excavation in Area H of the Hutian kiln-site was carried out in July-October 1999 by the Jiangxi Provincial Institute of Cultural Relics and Archaeology. The work covered an area of more than 1,300 sq m, revealed 11 spots of house-foundation, well, small yard,clay-refining pool and ash-pit remains, and discovered above 600 intact and restorable articles of greenish-white-glazed, egg-white-glazed, black-glazed and blue-and-white porcelain wares from the Song, Yuan and Ming periods. The excavation clarified relatively direct stratigraphic evidence on the typological evolution of the vessels typical of the Song and Yuan periods and threw light on a batch of egg-white-glazed “shu fu” porcelain objects of the early Yuan and some inscribed porcelain-making implements.
文摘On the lacquered eared-cup unearthed in 1995 from the No. 1 Chu tomb at Guodian, Jingmen, Hubei, there is the inscription “Donggong zhi shi 东宫之币.” Among the characters the “donggong” must refer to the crown prince of the Chu state, and the last character, in the light of the characteristics and evolutionary laws of similar phrases in inscriptions on oracle bones and bronzes as well as in those of the Eastern Zhou period, should be deciphered as the word “teacher.” So the whole inscription means the teacher of the Chu crown prince. It can further be inferred that the owner of the tomb might have been the Chu crown prince's teacher, the documents from there were teaching material for the prince, and the tomb and bamboo slips go back to a time earlier than 303 BC.
文摘The paper analyzes both the progress and problems in the western China developmentdrive over the past three years and attempts a tentative evaluation of the results of the drive.The authors hold that the western China development drive has been proceeding in anactive, orderly and steady fashion, and has achieved considerable success in the constructionof infrastructure, and improvement of ecological environment. However, there are stillmany problems. It has been slow in attracting non-governmental investment, in theimprovement of investment climate, regional industrialization and in opening up to theoutside world. It is, therefore, necessary to make adjustments to the western Chinadevelopment strategy during the remaining years of the Tenth Five-Year Plan period (2001-2005) and during the Eleventh Five-Year Plan period (2006-2010), make greater efforts inreform and opening up, improve the investment climate, accelerate the pace of industrializationand attract more non-governmental capital from at home and abroad.
基金This work was supported by the National High Tech-nology Research and Development Program of China (No. 2005AA641010)the National Natural Science Foundation of China (No. 50534050).
文摘Tunable diode laser absorption spectroscopy （TDLAS） has been widely employed in atmospheric trace gases detection. In the measurement of these trace gases, harmonic detection combined with a multi-pass white cell could remarkably enhance the detection sensitivity. In this paper, a portable TDLAS system built specifically for long time monitoring methane in the atmosphere is introduced. The detection limit is below 100 ppb that is enough for the monitoring of ambient methane, and the long time monitoring results obtained in Beijing are given, which is well coincident with that of the Fourier transform infrared （FTIR） spectroscopy.
文摘The reform of the housing system in Shanghai has unexpectedly given rise to a self-governed property owners’ collective supervisory system, primarily in the form of Property Owners’ Supervisory Council (POSC), which has picked up some of the government’s administrative functions. Although this new, institutionalized management model has theoretically made democratic managerial participation at the grassroots level possible, it has brought about endless problems, overt and covert, shortly after its appearance, some of which are even alarming. A comprehensive analysis of the data collected over a long period of time has led to the conclusion that this system is a failure, attributable to the overt factor related to skills in reality and the covert “priori” factor that is masked by the former. The existence of such “priori” factor once again demonstrates the deep-rooted, traditional managerial logic: Positive operations is society need only to depend upon individuals’ unstable self-disciplined morality rather than to build a system. The current paper points out that any change in the socioeconomic structure that has long been subject to the power of politics is to inevitably incur a corresponding global structural accommodation, including politics itself. To respond to the two factors for the failure, system building in the two overlapping areas is a must.
文摘Obesity is recognized as the second highest risk factor for cancer. The pathogenic mechanisms underlying tobaccorelated cancers are well characterized and efective programs have led to a decline in smoking and related cancers, but there is a global epidemic of obesity without a clear understanding of how obesity causes cancer. Obesity is heterogeneous, and approximately 25% of obese individuals remain healthy(metabolically healthy obese, MHO), so which fat deposition(subcutaneous versus visceral, adipose versus ectopic) is "malignant"? What is the mechanism of carcinogenesis? Is it by metabolic dysregulation or chronic inflammation? Through which chemokines/genes/signaling pathways does adipose tissue influence carcinogenesis? Can selective inhibition of these pathways uncouple obesity from cancers? Do all obesity related cancers(ORCs) share a molecular signature? Are there common(overlapping) genetic loci that make individuals susceptible to obesity, metabolic syndrome, and cancers? Can we identify precursor lesions of ORCs and will early intervention of high risk individuals alter the natural history? It appears unlikely that the obesity epidemic will be controlled anytime soon; answers to these questions will help to reduce the adverse efect of obesity on human condition.
文摘A nation-wide survey of blood pressure (BP) and high BP was made in China in 1991, using standardized methods and covering 950 356 men and women aged 15 years and above, from 30 provinces, autonomous regions, and municipalities. The purpose of the study was to estimate the prevalence and the status of awareness, treatment, and control of hypertension. The overall prevalence rate of hypertension defined as systolic BP> 140 or diastolic BP> 90 mmHg or currently on antihypertensive medication was 13.6%, and was higher in urban (16.3%) than in rural (11.1%) setting. The rate was 6.6% if a BP cut-point of 160 / 95 mmHg was used. Rates were low in younger age-groups but rose sharply after age 45. The total number of hypertensives in 1990 was estimated to be close to 90 millions. Of all hypertensives, about 1/4 were aware of their high BP, half of these were on medication, and only 3% had their BP controlled. All the rates were higher if the BP cut-point was 160 / 95 mmHg. Higher rates were found in urban than rural setting and, to a lesser degree, for women than men. In conclusion, hypertension was found to be common in China, and the rates of awareness, drug treatment, and controlled BP were low, indicating an urgent need for developing a national program of treatment and prevention of high BP.
文摘Aortic dissection is a life-threatening disease that can produce a variety of symptoms and complications. Patients at high risk for mortality, such as individuals with aortic regurgitation, cardiac tamponade, or myocardial infarction, should be treated by surgery as soon as possible, especially in cases with acute ascending aortic dissections （Stanford type A）. However, patients with aortic dissection may suffer adverse outcomes that lead to mortality and morbidity, such as stoke, re-dissection, myocardial infarction, and heart failure. Patients with surgically treated acute type A aortic dissection show an 18.2% likelihood of stroke in early morbidity.
文摘In this paper, the conversion of CO2/CH4 by using pulse corona plasma was studied at atmospheric pressure and ambient temperature. The effects of ratio of CO2/CH4, pulse voltage and repeated frequency of plasma discharge were first studied in the system.
文摘Research shows teachers’speaking less so involvesstudents more.So English teacher talk determines tosome extent whether the teaching is successful or not.After giving a brief introduction to teacher talk inEnglish class,this paper analyzes the possible factorsthat affect teacher talk.It then suggests some im-provements of teacher talk in order to better our teach-ing methodology.
基金supported by the National Natural Science Foundation of China (51421091 and 51332005)the Natural Science Foundation for Distinguished Young Scholars of Hebei Province of China (E2014203150)
文摘Over the past several decades, great endeavors have been devoted to superhard materials research, among which two topics are of central focus. One is to understand hardness microscopically and reveal the controlling factors for superhardness, which can be used to guide the design of novel superhard crystals;the other is to synthesize superhard materials with enhanced comprehensive performance(i.e., hardness, fracture toughness,and thermal stability), with the ambition to synthesize materials harder than natural diamond. We proposed a microscopic understanding of the indentation hardness as the combined resistance of chemical bonds in a material to indentation, and established a microscopic hardness model for covalent and polar covalent crystals, which was further generalized to polycrystalline materials. Guided by the polycrystalline hardness model, we successfully synthesized nanotwinned cubic boron nitride and diamond bulks under high pressure and high temperature. These materials exhibit simultaneous improvement of hardness, fracture toughness, and thermal stability, designating a new direction for superhard materials research.
