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Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Power Generation Technology is the property of Power Generation Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of University Chemistry is the property of Peking University, College of Chemistry & Molecular Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Smart Rail Transit is the property of Smart Rail Transit Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: Stroke has become one of the thorny diseases facing the world due to its high morbidity, high mortality, high disability rate, and high recurrence rate. However, traditional rehabilitation methods, characterized by slow effect, low efficiency, and dull training, elicit little effects in the treatment of stroke. With the development of science and technology, virtual reality technology which has the characteristics of simplicity, high efficiency, high security, strong interest, low price, and real-time feedback can solve the imbalance of doctor-patient ratio, promote the development of remote rehabilitation medicine, and has extremely important practical significance for the rehabilitation of stroke patients. OBJECTIVE: To study the research hotspots and progress of virtual reality technology in stroke treatment using Citespace V knowledge graph software, and to clarify the structural model of this field and predict the possible development trends of virtual reality technology worldwide in the future. METHODS: A total of 1 374 core articles addressing virtual reality technology published since 2007 were retrieved from Web of ScienceTM, CNKI, CSSCI, and CSCD database and used as data sources. Citespace V knowledge graph software was used to analyze the research status of virtual reality technology in stroke treatment. In addition, the domestic and foreign differences in disciplines, countries, authors, institutions, and research hotspots were compared. Then, the possible development trend in the future was predicted. RESULTS AND CONCLUSION: The foreign countries have formed a multi-disciplinary and multi-domain comprehensive group, focusing on neuroscience, computer science, and biomedical engineering. Domestic disciplines are relatively monotonous, and no obvious discipline group has formed. There is a network of close exchanges and cooperation that has formed between foreign countries/regions, authors, and institutions, forming a high school mentality of countries, authors, and institutions. The cooperation among domestic authors, groups and institutions is poor, with geographical restrictions, and there is a lack of influential academic groups and institutions. There are differences in research contents at home and abroad, and there have been four development stages of this technology in foreign countries. The possible trends of future research abroad are the research, development and evaluation of remote rehabilitation medicine, robot-assisted therapy, and virtual rehabilitation system, highlighting the screening of virtual rehabilitation therapy. The possible future research topics in China may be the effect and evaluation of the combined treatment of specific parts with virtual reality technology and other methods, and the introduction and development of advanced technology. [ABSTRACT FROM AUTHOR]

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tourism Tribune / Lvyou Xuekan is the property of Tourism Institute of Beijing Union University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

210Pbex and 137Cs measurements were carried out to trace the variations in soil depth and erosion rates in the cultivated and reforested land, aiming to explore the changes of soil retention due to the construction of the “Three North” shelterbelt program in the north of China. A typical shelterbelt and wind dominant region was selected, particularly on the Bashang Region of Zhangjiakou City, Hebei province, China. The results showed that in the cultivated land, both 137Cs and 210Pbex in the soil profile were uniformly distributed, due mainly to the mixing effect of tillage. In the reforested land, the 137Cs and 210Pbex concentrations in the 0-0.05 m soil layers were obviously higher than those in the other depth soil layers. There were roughly uniform concentrations of 137Cs and 210Pbex from 0.05 m to 0.15 m of the upper 0.15 m soil layer. It infers that the 137Cs and 210Pbex profile of soil can be changed after reforestation, thereby posing a great challenge on the use of 137Cs and 210Pbex to estimate the variation in soil erosion rates under the conditions of reforestation. A revised 210Pbex model of soil erosion in the reforested land was proposed using the 210Pbex mass balance equation in the temporal change trends of 137Cs and 210Pbex profiles. In the 137Cs proportional model, the mean soil erosion rates of reforested and cultivated land were 27.94±11.92 t/(hm² ·a) and 29.11±14.42 t/(hm² ·a). In the revised 210Pbex conversion model, the soil erosion rates of reforested and cultivated land were 82.16±14.36 t/(hm² ·a) and 68.55±22.11 t/(hm² ·a) before the construction of Three-North shelter forest, whereas, those were -41.28±33.91 t/(hm² ·a) and -8.52±47.32 t/(hm² ·a) after the constructed. It indicates that the 137Cs tracing can be used to characterize the average soil erosion rates and deposition rates on the slopes since 1963. Nevertheless, the 210Pbex tracer technology can be used to trace the variations in soil erosion rates before and after the shelter forest was constructed. In addition, the wind erosion rates of cultivated and reforested land obviously declined, due to the construction of Three-North Shelter Forest, where the cultivated and reforested land have been transformed from erosion zone to deposition zone in the study area. [ABSTRACT FROM AUTHOR]

Copyright of Clean Coal Technology is the property of Clean Coal Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Idle is one of the important operating conditions for non-road diesel engines. In China III, IV stage emission regulations from diesel engines for non-road mobile machinery, the proportion of idle condition in the eight-condition steady-state test cycle is 15% for the diesel engine operating at non-constant speed, and its ratio is 5% in the six-condition steady-state test cycle for the diesel engine with rated net power less than 19 kW and operating at unsteady speed. In China IV stage of non-road transient cycle (NRTC), the idle condition accounts for 4.52%. Due to the fact that the idle condition does not output power and also the fuel injection amount is small, the air-to-fuel ratio is relatively large and the combustion is incomplete at this time, which results in a large amount of fuel consumption and high emission of harmful gases. The land area with an altitude of more than 1 000 m in China is about 58% of the total area of the country, and proportion is about 33% for the plateau area with an altitude of more than 2 000 m. A large number of agricultural machinery powered by diesel engines operate at these areas. Compared with the sea level, atmospheric pressure will decline in plateau areas, the intake air mass flow rate decreases, and the operating performance at idle condition will further deteriorate. In order to investigate the effects of atmospheric pressure on combustion characteristics and emission performance of a small agricultural diesel engine at idle condition, the change law of combustion and emission performance of the small agricultural diesel engine, which meets the emission standard of China III non-road mobile machinery, was studied at different atmospheric pressures such as 80, 90, 100 kPa by using atmospheric pressure simulator. The experimental results demonstrated that the turbocharger matched with the small agricultural diesel engine did not work, and also the turbocharger system did not have self-compensation capability in plateau area at idle condition. Peak in-cylinder pressure, peak in-cylinder pressure rise rate, and peak heat release rate all go up with an increasing of atmospheric pressure; the average increase rate were 13.33%, 37.24% and 6.76%, respectively, with atmospheric pressure increased per 10 kPa. However, peak in-cylinder combustion temperature showed a decreased tendency with atmospheric pressure increased; the average decrease rate was 11.18% with atmospheric pressure increased per 10 kPa. Atmospheric pressure had a great influence on carbon monoxide (CO) emission and hydrocarbon (HC) emission. CO emission and HC emission declined sharply with an increasing of atmospheric pressure; the average decrease rate were 47.47% and 55.77%, respectively, with atmospheric pressure increased per 10 kPa. The variation range of nitrogen oxides (NOx) emission and smoke were relatively small with atmospheric pressure increased. With atmospheric pressure increased per 10 kPa, the average NOx emission increased 18.93%, while the average smoke reduced 11.90%. This research can provide a reference for the establishment of emission control strategy for a small agricultural diesel engine at idle condition in a plateau area. [ABSTRACT FROM AUTHOR]

The single pile foundations of offshore wind power are widely used due to their advantages of factory production and high offshore construction efficiency, while the installation of wind turbines on single pile foundations is mainly split installation. Based on Guohua Dongtai Offshore Wind Power, we carried out research on the overall installation technology for single pile foundation wind turbines of offshore wind power, and implemented the integral installation of single pile foundation wind turbines. The formation of the single pile foundation wind turbine integrated installation technology has enriched China's offshore wind power installation and construction technology and has broad application prospects. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The environment pressure and air density experience sharp declines at high altitude, which cause a large drop in the intake air mass flow rate of diesel engines. As a result, many aspects of engine performance are deteriorated, such as power, fuel consumption and emissions. Turbocharging matching provides a good technical solution for recovery diesel engine performance at high altitude. There is a large number of agricultural machinery operating in plateau area of China. In order to ensure that the agricultural machinery used in these areas had a good plateau adaptability, taking a small agricultural diesel engine as the research object, an appropriate compressor and turbine were selected respectively through theoretical calculation according to the design and development goals at altitude of 2 000 m. After that, the matching test of the small agricultural diesel engine and selected turbocharger was conducted at this altitude. Finally, the simulation model of the small agricultural turbocharged diesel engine was built by using GT-Power code based on test data. The change rule of diesel engine key performance parameters were simulated and investigated at altitudes of 0, 2 000 and 4 000 m. The results showed that the selected turbocharger made the small agricultural diesel engine achieve the development requirements at the altitude of 2 000 m. Low-end torque reached 120.1 N·m at 1 000 r/min, the peak torque was 180.2 N·m at 1 600 r/min, the rated power was 37.4 kW at 2 600 r/min, and the torque backup coefficient was 131% at this altitude. At 3 altitudes of 0, 2 000 and 4 000 m, the joint operation lines of the small agricultural diesel engine and the selected compressor were all operating in the relatively high efficiency area, and there were a large surge margin at low engine speeds, and also a certain distance from the choke line at high engine speeds. As the altitude went up, the engine torque and boost pressure decreased, while brake specific fuel consumption and turbine inlet gas temperature increased. What’s more, with respect to high engine speed, the change of altitude had a greater impact on engine power and economy performance at low engine speed. With the increase of altitude, decreasing amplitude of torque and percentage gain of fuel consumption was both rose at low engine speed, and these tendency were decline gradually with the increase of engine speed. In addition, the engine speed corresponding to the peak torque showed a tendency of gradually moving towards higher engine speed at high altitude. Compared with plain area, the maximum engine torque decreased by 2.59% and 7.19% respectively when it ran at altitudes of 2 000 and 4 000 m. Meanwhile, compared with the previous literatures conclusion, the decreasing amplitude of peak engine torque was smaller when the small agricultural diesel engine operating at altitudes of 2 000 and 4 000 m, respectively. It can ensure the good operation performance of diesel engine in plateau area, and also is beneficial to improve the plateau adaptability when diesel engine and turbocharger are matched at high altitude. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)