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Landscape Ecological Changes of Large Dams and Reservoir in China
Lu, Jianbo,Xingzheng Zaho,Lizhong Ding 한국생태학회 2004 Journal of Ecology and Environment Vol.27 No.1
Dams are distributed widely in all over the world. China is one of the countries which have the most dams in the world. The construction of dams promotes consumedly to the development of economy and society, at the same time, brings many ecological and social problems. In China, the landscape ecological changes are caused by the construction of dams. These changes are long term or short term, and some of these changes are positive, others are negative. Solving these issues need do a lot of circumspect work in location choosing, planning and designing, practicing and protection of the up reservoir basin and the whole basin and so on. The construction of dams should be implemented by reasonable landscape planning, ecological environment protection in order to realize sustainable development.
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Typical Patterns of Ecological Engineering in Southern China
Lu, Jianbo,Xingzheng Zaho,Lizhong Ding 한국생태학회 2004 Journal of Ecology and Environment Vol.27 No.1
With the emergence and development of ecological engineering in China, and also the research and demonstration of Chinese Ecological Agriculture (CEA), in recent 10 years many types of ecological engineering have been appeared in Southern China, they could be classified into 4 typical patterns. These typical patterns are: 1. Ecological Building (EB), such as ecological public toilet, ecological garden, ecological integrated building, farmers ecological household, the combine of ecological building and CEA; 2. Ecological Engineering in Paddy Field (EEPF), like rice-fish system, water caltrop-wild ricestem-fish system, mulberry-silkworm-pig-fish system; 3. Ecological Engineering of Agroforestry Systems (EEAF), as tea-food crops intercropping system, rubber-tea-chicken system, bamboo-chicken system, fruit tree-chicken system, metasequoia-fish-duck system; 4. Ecological Engineering Linked with Biogas (EELB), such as animal (pig)-biogas-fish system, animal (pig)-biogasfruit tree system, animal-biogas-food crops system. Some case studies were presented in the paper. It is showed that these typical patterns have better ecological, social and economic benefits, now they are deeply been extending in southern China.
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Yuqin Lu,Wenyu Zhou,Yue Feng,Yao Li,Ke Liu,Lizhong Liu,Dongxu Lin,Zhendan He,Xuli Wu 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.6
Acteoside, the predominant polyphenol of small-leaved kudingcha, the Chinese tea, has various biological activities. In this study, we examined the acyl migration of acteoside to isoacteoside with high-temperature treatment of acteoside. The inhibitory effects of acyl-migrated acteoside and acteoside on α-amylase were investigated, as were their binding interaction with α-amylase. The binding of acteoside and isoacteoside to α-amylase was investigated by using the fluorescence spectra assay, circular dichroism, and protein–ligand docking studies. Acteoside was more effective than preheated acteoside and isoacteoside in inhibiting α-amylase activity. Acteoside and isoacteoside binding to α-amylase may induce conformational changes to α-amylase, and the binding site of acteoside and isoacteoside being near the active site pocket of α-amylase may explain the decreased activity of α-amylase. The different affinities and binding sites of acteoside and isoacteoside for α-amylase resulted in different inhibition rates, which may be due to structural differences between acteoside and isoacteoside.
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Chengdu Xu,Yan Ren,Hesheng Tang,Lizhong Lu,Yu Huang,Jian Ruan 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2
In the traditional valve controlled hydraulic system, flow control is realized by changing the orifice area of the control valve, which inevitably leads to throttling loss. However, the high-speed on-off valve is different from other control valves because it realizes the instantaneous release of energy by quickly opening the valve port. Therefore, it can be theoretically considered that there is no throttling loss in the fully open state. Inspired by the operating principle of the high-speed on/off valve, a novel high frequency two-dimensional (2D) rotary valve variable mechanism is proposed, which is used to generate discrete fluid by the fluid pulsewidth-modulation to control and distribute the flow. This rotary valve variable mechanism is similar to an on/off valve group, and a group of rhombic valve ports are evenly arranged on the circumferential shoulder. The valve spool has two non-interference degrees of freedom: rotary motion and sliding. With the high speed rotation of the valve spool, the valve port can be quickly ‘opened’ (connected with the load) - ‘closed’ (connected with the oil tank); while the valve spool slides, the duration ratio of "on" and "off" of the valve port can be adjusted. Similar to the on-off valve, the flow through the rotary valve port mainly depends on the communication time of the valve port (the instant of opening and closing the valve port is not in the scope of discussion). The concept of 2D rotary valve variable mechanism is verified by the simulation and the experiment. The results show that the variable mechanism generates discrete fluid with adjustable duty cycle. In the PWM driven high-speed on/off valve, this is the technology to realize the fluid pulse-width-modulation through the mechanical structure of the fluid control element itself, rather than the PWM control to control the motor, and finally the fluid is controlled to meet the system's demand for oil supply.
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