In this study the regeneration diversity of Syahkal forests afforestated and natural stands in north of Iran was studied and compared from the point of view of evenness and diversity index. In order to accomplish this...In this study the regeneration diversity of Syahkal forests afforestated and natural stands in north of Iran was studied and compared from the point of view of evenness and diversity index. In order to accomplish this study two natural and man-made stands that almost are located in the same height above the sea level were chosen. The area of each stand was 30 ha and the inventory was done by the random-systematic method with a 5R land measurement （500 m2） selected. Also, in order to study the regeneration in the center of each sample piece 125 square meters micro plots were formed. The results show that regeneration diversity index in natural stands is more than that in man-made stands which in this case Mc-Arthur index with 2.41 has the most amount while Simpson index with 0.543 has the least amount. But the evenness indexes in man-made stands are more than that in natural stand which the main reason is the purity of the man-made stand.展开更多
China Society for Human Rights Studies, I would like to extend my warm greetings to the launch of your Human Rights magazine. Enjoying human rights fully is a lofty goal long pursued after by human race. Over the year...China Society for Human Rights Studies, I would like to extend my warm greetings to the launch of your Human Rights magazine. Enjoying human rights fully is a lofty goal long pursued after by human race. Over the years when they carried out revolution, construction and reforms, the Chinese people have struggled indomitably and strived incessantly to achieve this goal. Progress made in this regard has caught worldwide attention. When struggling for, safeguarding, promoting and developing human rights, the Chinese people have always combined the universality prin-展开更多
According to information from the relevant administrative department of China’s shoe-making industry, through development in the past decade in China’s shoe-making industry, the most developed cities for light indus...According to information from the relevant administrative department of China’s shoe-making industry, through development in the past decade in China’s shoe-making industry, the most developed cities for light industry, Shanghai and Tianjin, are no longer its major production bases, while in cities as Quanzhou, Wenzhou and Huidong, the shoe-making industry has witnessed more rapid development through the introduction of shoe-making equipment展开更多
One day in April,our reporters visitedthis national super-large enterprise.Mr Huang Xiaoping,the generalmanager,briefed us on the company’s brilliantpast and bright future. The Yuejin Auto Group Company isfamed all o...One day in April,our reporters visitedthis national super-large enterprise.Mr Huang Xiaoping,the generalmanager,briefed us on the company’s brilliantpast and bright future. The Yuejin Auto Group Company isfamed all over the world for producing YuejinBrand automobiles.In 1958,the firstgeneration of Yuejin Brand automobiles cameout,and China has since had its first展开更多
正The Understanding and Cooperation Dialogue, Sponsored by the Chinese Association for International Understanding (CAFIU) and the China Foundation for Peace and Development (CFPD), and Co-organized by the Chinese Peo...正The Understanding and Cooperation Dialogue, Sponsored by the Chinese Association for International Understanding (CAFIU) and the China Foundation for Peace and Development (CFPD), and Co-organized by the Chinese People' s Association for Peace and展开更多
She clambers up a rock, reaches both hands onto comers of the shabby cement wall and heaves herself up, being careful not to catch her school bag on the protruding bricks. She straddles the top and then jumps gingerly...She clambers up a rock, reaches both hands onto comers of the shabby cement wall and heaves herself up, being careful not to catch her school bag on the protruding bricks. She straddles the top and then jumps gingerly down onto the pebbled ground beside the railway line.展开更多
Tremendous changes have takenplace in Tibet under the state policy of reform andopening up to the outside world, especially over thepast 14 years since the Fourth Plenary Session of the13th Central Committee of the Ch...Tremendous changes have takenplace in Tibet under the state policy of reform andopening up to the outside world, especially over thepast 14 years since the Fourth Plenary Session of the13th Central Committee of the Chinese CommunistParty. Unprecedented are the development of the localeconomy, and so are the changes in the outlook ofcities and countryside in the region, and life of ethnicTibetan has kept improving.Raidi, vice-chairman of the Standing Committee ofthe National People's Congress (NPC), is a mostqualified eyewitness to these changes. He was born intoa serf's family before the Democratic Reform in thelate 1950s, and had worked on various leading posts inTibet before he was elected to NPC, China's highestlegislature. In July 1990, Jiang Zemin, then generalsecretary of the CPC Central Committee, cited Raidi asan example when speaking on the question of humanrights during an inspection tour of Lhasa. Said he,'What do human rights mean? Comrade Raidi, aformer serf, now works as the second most seniormember of the Chinese Communist Party Committee ofTibet Autonomous Region, his experiences bring outthe meaning of human rights. Aren't we justified topublicize that?'Following is a slightly abridged text of an interviewgiven by Raidi to our staff reporter on the eve of theNew Year's day, in which he talked about theachievements Tibet has made over the past 14 yearsand the Party's policy in Tibet.展开更多
The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we presen...The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we present a simple vacuum filtration method to synthesize nitrogen and sulfur codoped graphene(N,S-G) blocking layer, which is ultra-lightweight, conductive, and free standing. When the N,S-G membrane was inserted between the catholyte and separator, the lithium–selenium(Li–Se)batteries exhibited a high reversible discharge capacity of 330.7 mAh g^(-1) at 1 C(1 C = 675 mA g^(-1)) after 500 cycles and high rate performance(over 310 mAh g^(-1) at 4 C) even at an active material loading as high as ～5 mg cm^(-2). This excellent performance can be ascribed to homogenous dispersion of the liquid active material in the electrode, good Li^+-ion conductivity, fast electronic transport in the conductive graphene framework, andstrong chemical confinement of polyselenides by nitrogen and sulfur atoms. More importantly, it is a promising strategy for enhancing the energy density of Li–Se batteries by using the catholyte with a lightweight heteroatom doping carbon matrix.展开更多
Three-dimensional(3D)carbon networks have been explored as promising capacitive materials thanks to their unique structural features such as large ion-accessible surface area and interconnected porous networks,thus en...Three-dimensional(3D)carbon networks have been explored as promising capacitive materials thanks to their unique structural features such as large ion-accessible surface area and interconnected porous networks,thus enhancing both ions and electrons transport.Here,sustainable bacterial cellulose(BC)is used both precursor and template for facile synthesis of free-standing N,S-codoped 3Dcarbon networks(a-NSC)by the pyrolysis and activation of polyrhodanine coated BC.The synthesized a-NSC shows highly conductive interconnected porous networks(24S·cm^(-1)),large surface area(1 420m^2·g^(-1))with hierarchical meso-microporosity,and high-level heteroatoms codoping(N:3.1%in atom,S:3.2%in atom).Benefitting from these,a-NSC as binder-free electrode exhibits an ultrahigh specific capacitance of 340F·g^(-1)(24μF·cm^(-2))at the current density of 0.5A·g^(-1)in 6MKOH electrolyte,high-rate capability(71%at 20A·g^(-1))and excellent cycle stability.Furthermore,the assembled symmetrical supercapacitor displays a much short time constant of 0.35sin 1MTEABF4/AN electrolyte,obtaining a maximum energy density of 32.1W·h·kg^(-1 )at power density of 637W·kg^(-1).The in situ multi-heteroatoms doping enables biocellulose-derived carbon networks to exploit its full potentials in energy storage applications,which can be extended to other dimensional carbon nanostructures.展开更多
文摘In this study the regeneration diversity of Syahkal forests afforestated and natural stands in north of Iran was studied and compared from the point of view of evenness and diversity index. In order to accomplish this study two natural and man-made stands that almost are located in the same height above the sea level were chosen. The area of each stand was 30 ha and the inventory was done by the random-systematic method with a 5R land measurement （500 m2） selected. Also, in order to study the regeneration in the center of each sample piece 125 square meters micro plots were formed. The results show that regeneration diversity index in natural stands is more than that in man-made stands which in this case Mc-Arthur index with 2.41 has the most amount while Simpson index with 0.543 has the least amount. But the evenness indexes in man-made stands are more than that in natural stand which the main reason is the purity of the man-made stand.
文摘China Society for Human Rights Studies, I would like to extend my warm greetings to the launch of your Human Rights magazine. Enjoying human rights fully is a lofty goal long pursued after by human race. Over the years when they carried out revolution, construction and reforms, the Chinese people have struggled indomitably and strived incessantly to achieve this goal. Progress made in this regard has caught worldwide attention. When struggling for, safeguarding, promoting and developing human rights, the Chinese people have always combined the universality prin-
文摘According to information from the relevant administrative department of China’s shoe-making industry, through development in the past decade in China’s shoe-making industry, the most developed cities for light industry, Shanghai and Tianjin, are no longer its major production bases, while in cities as Quanzhou, Wenzhou and Huidong, the shoe-making industry has witnessed more rapid development through the introduction of shoe-making equipment
文摘One day in April,our reporters visitedthis national super-large enterprise.Mr Huang Xiaoping,the generalmanager,briefed us on the company’s brilliantpast and bright future. The Yuejin Auto Group Company isfamed all over the world for producing YuejinBrand automobiles.In 1958,the firstgeneration of Yuejin Brand automobiles cameout,and China has since had its first
文摘正The Understanding and Cooperation Dialogue, Sponsored by the Chinese Association for International Understanding (CAFIU) and the China Foundation for Peace and Development (CFPD), and Co-organized by the Chinese People' s Association for Peace and
文摘She clambers up a rock, reaches both hands onto comers of the shabby cement wall and heaves herself up, being careful not to catch her school bag on the protruding bricks. She straddles the top and then jumps gingerly down onto the pebbled ground beside the railway line.
文摘Tremendous changes have takenplace in Tibet under the state policy of reform andopening up to the outside world, especially over thepast 14 years since the Fourth Plenary Session of the13th Central Committee of the Chinese CommunistParty. Unprecedented are the development of the localeconomy, and so are the changes in the outlook ofcities and countryside in the region, and life of ethnicTibetan has kept improving.Raidi, vice-chairman of the Standing Committee ofthe National People's Congress (NPC), is a mostqualified eyewitness to these changes. He was born intoa serf's family before the Democratic Reform in thelate 1950s, and had worked on various leading posts inTibet before he was elected to NPC, China's highestlegislature. In July 1990, Jiang Zemin, then generalsecretary of the CPC Central Committee, cited Raidi asan example when speaking on the question of humanrights during an inspection tour of Lhasa. Said he,'What do human rights mean? Comrade Raidi, aformer serf, now works as the second most seniormember of the Chinese Communist Party Committee ofTibet Autonomous Region, his experiences bring outthe meaning of human rights. Aren't we justified topublicize that?'Following is a slightly abridged text of an interviewgiven by Raidi to our staff reporter on the eve of theNew Year's day, in which he talked about theachievements Tibet has made over the past 14 yearsand the Party's policy in Tibet.
基金supported by the National Natural Science Foundation of China (51125001,51172005)the NSFCRGC Joint Research Scheme (51361165201)the Start-up Foundation of High-level Talents in Chongqing Technology and Business University (1856008)
文摘The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we present a simple vacuum filtration method to synthesize nitrogen and sulfur codoped graphene(N,S-G) blocking layer, which is ultra-lightweight, conductive, and free standing. When the N,S-G membrane was inserted between the catholyte and separator, the lithium–selenium(Li–Se)batteries exhibited a high reversible discharge capacity of 330.7 mAh g^(-1) at 1 C(1 C = 675 mA g^(-1)) after 500 cycles and high rate performance(over 310 mAh g^(-1) at 4 C) even at an active material loading as high as ～5 mg cm^(-2). This excellent performance can be ascribed to homogenous dispersion of the liquid active material in the electrode, good Li^+-ion conductivity, fast electronic transport in the conductive graphene framework, andstrong chemical confinement of polyselenides by nitrogen and sulfur atoms. More importantly, it is a promising strategy for enhancing the energy density of Li–Se batteries by using the catholyte with a lightweight heteroatom doping carbon matrix.
基金supported by the National Basic Research Program of China(973 Program)(No.2014CB239701)the National Natural Science Foundation of China(Nos.51672128,51372116,21773118)+2 种基金the Natural Science Foundation of Jiangsu Province(Nos.BK20150739,BK20151468)the Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province(No.BY2015003-7)the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘Three-dimensional(3D)carbon networks have been explored as promising capacitive materials thanks to their unique structural features such as large ion-accessible surface area and interconnected porous networks,thus enhancing both ions and electrons transport.Here,sustainable bacterial cellulose(BC)is used both precursor and template for facile synthesis of free-standing N,S-codoped 3Dcarbon networks(a-NSC)by the pyrolysis and activation of polyrhodanine coated BC.The synthesized a-NSC shows highly conductive interconnected porous networks(24S·cm^(-1)),large surface area(1 420m^2·g^(-1))with hierarchical meso-microporosity,and high-level heteroatoms codoping(N:3.1%in atom,S:3.2%in atom).Benefitting from these,a-NSC as binder-free electrode exhibits an ultrahigh specific capacitance of 340F·g^(-1)(24μF·cm^(-2))at the current density of 0.5A·g^(-1)in 6MKOH electrolyte,high-rate capability(71%at 20A·g^(-1))and excellent cycle stability.Furthermore,the assembled symmetrical supercapacitor displays a much short time constant of 0.35sin 1MTEABF4/AN electrolyte,obtaining a maximum energy density of 32.1W·h·kg^(-1 )at power density of 637W·kg^(-1).The in situ multi-heteroatoms doping enables biocellulose-derived carbon networks to exploit its full potentials in energy storage applications,which can be extended to other dimensional carbon nanostructures.
