Search

面对新型电力系统的低惯量趋势，规模庞大而位置分散的温控负荷在参与电力系统频率响应的同时，能够为电网提供虚拟惯量和一次调频支撑将是提升电网频率安全的新思路。为此，以集中-分布式调控框架下的温控负荷集群为研究对象，首先在详细分解控制层调控中心、协调层聚合商、响应层温控负荷终端三者在辅助调频过程中的采样、计算、控制、执行一系列实时任务的基础上，设计了事件触发与时间触发相结合的温控负荷集群终端异步响应机制，实现温控负荷集群功率遵从综合惯性控制律的效果。随后，对所提综合惯性控制下温控负荷集群参与调频的电力系统进行频率响应建模，并进一步利用改进劳斯近似实现系统降阶，从而获得系统频率响应关键特征的时域解析表达式。最后，通过仿真算例验证了所提基于时间触发机制的温控负荷集群综合惯性控制的有效性，并分析了采用改进劳斯近似对系统模型降阶的可行性。

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering 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 Electric Drive for Locomotives is the property of Electric Drive for Locomotives 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 Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics 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 Pearl River is the property of Pearl River 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 Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation 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 Cancer Research on Prevention & Treatment is the property of Cancer Research on Prevention & Treatment 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 Pearl River is the property of Pearl River 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 Basic & Clinical Medicine is the property of Editorial Office of Basic & Clinical Medicine 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 Diamond & Abrasives Engineering is the property of Zhengzhou Research Institute for Abrasives & Grinding 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 Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & 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.)

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 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.)

o demonstrate the nonlinear relationship between the digital economy and carbon emission reduction, this paper integrates economic agglomeration, digital economy and carbon emission elements into traditional production functions and constructs the theoretical model that the digital economy affects spatial carbon emissions under economic agglomeration, further uses the dynamic spatial Durbin model （SDM） to conduct empirical investigations. The results show that the digital economy has nonlinear effect on spatial carbon emissions under economic agglomeration. The digital economy has inverted U-shaped local carbon emission reduction effect that promotes growth first and then inhabits it and meanwhile, it has U-shaped spatial spillover emission reduction effect that first inhabits and then promotes growth. Economic agglomeration has amplifier effect on the spatial emission reduction effect of digital economy, which enhances the impact of digital economy on spatial carbon emissions. The spatial carbon emission reduction effect of digital economy is mainly based on the path of economic growth and technological progress, while the fixed asset investment path under the multi-path combination is not significant. Based on the above analysis, policy recommendations are put forward in terms of digital economy development driving the upgrading of industrial structure, strengthening the connection between regional economic development and environmental governance, and promoting the deep integration of digital economy and traditional industries. [ABSTRACT FROM AUTHOR]

Copyright of Food & Machinery is the property of Food & Machinery 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 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 Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering 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 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 Journal of Shanghai Jiaotong University (Medical Science) is the property of Journal of Shanghai Jiaotong University (Medical Science) 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 Food Research & Development is the property of Food Research & Development 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.)

The high metamorphic grade and low bedding development of coal，along with the low reservoir pressure of gas have seriously restricted the development and usage of coalbed methane. In order to promote the fundamental research on enhanced coal bed methane recovery，a series of laboratory experiments were conducted on raw coal specimens by using special equipment，which is designed and developed independently，to investigate the effect of different injecting pressure and temperature of CO2 The results show that，the pressure and temperature of injected CO2 are the main factors which have impact on output rate of CH4 and CO2 storage，higher injection pressure and temperature can lead to more CH4 output and CO2 storage and more rapider rate of CH4 output and CO2 storage，the increase of CO2 pressure，from 2 MPa to 4 MPa，can result in the increase of CH4 output rate，from 6.7% to 17.4%，and CO2 storage (78.6%-99.7%)；the increase of injecting temperature (28 ℃ to 60 ℃) can lead to the increase of CH4 output rate (40.0%-43.8%) and CO2 storage (23.8%-38.4%)，but reduce the replacement ratio，which is from 8.4% to 20.2%. The increase of injection pressure and temperature can cause greater deformation of coal samples，the axial strain can increase by 98.1% and 104.7%. The permeability of coal decreases about 37.1%-71.3% after room temperature displacement experiment but the reduction become less when the injection temperature increases，which become 19.8%-64.3%. [ABSTRACT FROM AUTHOR]

Based on the theory of evidence-based nursing ability, this paper summarized present situation and influencing factors of evidence-based practice ability of nurses in Traditional Chinese Medicine hospitals. In perspectives of practice, attitude, knowledge skill and relationship between evidence-based nursing skills and various influencing factors, a multi-level analysis on research progress of nurses’ evidence-based nursing ability was conducted, aiming to provide guidance and reference to promote the development of evidence-based practice ability and related training programs for nurses in Traditional Chinese Medicine hospitals. (以循证护理能力理论为基础, 对中西医结合医院护士循证实践能力现状及影响因素进行概述, 分别从循证实践行为、循证实践态度、循证知识技能及循证护理能力水平与各影响因素之间的关系, 多层次分析中西医结合医院护士循证护理能力研究进展, 为促进中医院护士强化循证实践能力及相关培训方案的制定提供指导性意见与参考。)

公眾授權條款的推動是貫徹自由文化運動的重要方法與策略，然而，由於不同種類授權條款彼此間存在著不相容的問題，自由文化運動正面臨著資訊、社群、創作人及個別著作被割裂的危機。本文以自由文化運動中最重要的兩種授權條款——創用CC 授權條款及GFDL——為核心，析述授權不相容對於協力創作及重新混用創作方式所帶來之負面影響，並站在授權人之立場，觀察兩種授權條款之差異性。此外，本文亦介紹兩種授權條款近年來在促進彼此相容所作之努力及其侷限，同時就自由文化運動及授權條款相容性未來的長期發展，提出相關建議。 Promoting public licenses has been a crucial approach and strategy to free culture movement supporters. These licenses not only enlarge the scope of intellectual commons, but also reinforce the value and social norms underlying the movement. Nonetheless, as more and more public licensees emerge in the free culture communities, the freedom granted by these licenses is not elevated accordingly. On the contrary, intellectual commons, communities, and creators are increasingly fragmented because of the incompatibility between different public licenses. Using two of the most important licenses—Creative Commons licenses and GNU Free Documentation License—in free culture movement as examples, this Article illustrates how license incompatibility has become an obstacle for peer production and remixing creativity. This Article also analyzes the subtle differences between the two aforementioned licenses. Such analysis may help explain dissimilar preferences of a wide range of licensors and why various licenses simultaneously exist in the free culture communities. Furthermore, this Article provides a strategic guide for communities to solve the incompatibility problem.

由於網際網路與數位科技的快速發展，數位匯流已經成為通訊傳播產業發展的主要潮流。數位匯流在技術上代表著不同數位產品間的功能整合；在產業面，則象徵著不同通訊傳播產業間的垂直整合。就管制面而言，數位匯流顛覆了原本以傳輸技術為區分基礎的通訊管制體系，並引發論者關於多媒體事業濫用市場力的疑慮。我國甫通過通訊傳播基本法及國家通訊傳播委員會組織法，並於今年成立國家通訊傳播委員會，以因應數位匯流的挑戰。 本文除討論國家通訊傳播委員會未來可能面對的管制挑戰外，並析述分層模式及技術中立原則等與數位匯流相關的管制思維。 With the advancement of the Internet and digital technologies, digital convergence has become a significant trend in the communications industry. In terms of technology, digital convergence means the integration between different digital products; it also symbolizes the vertical integration between different communications industries. Nonetheless, digital convergence has brought rigorous challenges to the existing regulatory framework, which divides up the landscape based on traditional services and technologies. Moreover, such convergence may enable businesses to further leverage their market power to neighboring markets, and, thus, lead to antitrust concerns. In order to cope with regulatory issues with regard to digital convergence, the Taiwanese government just enacted Communications Basic Law, and established the National Communications Commission (NCC). This paper not only portraits the challenges facing NCC, but also introduces some potential regulatory responses, such as layered model and technology neutrality doctrine.

Objective To investigate the correlation between stress hyperglycemia ratio (SHR) and 90-day clinical prognosis of patients with acute ischemic stroke (AIS). Methods The data of AIS patients who were admitted in Department of Neurology, Yangpu Hospital, Tongji University from May 2016 to October 2020 were retrospectively analyzed. The outcome was assessed by 90-day mRS and composite vascular events (recurrent stroke, myocardial infarction and vascular death). The favorable prognosis was defined as a mRS score of 0-2, and unfavorable prognosis was defined as a mRS score of 3-6 and composite vascular events within 90 days after stroke. SHR was calculated by fasting blood glucose divided by the estimated average blood glucose. The multivariate logistic regression analysis was used to determine whether SHR was an independent influencing factor of the 90-day prognosis. ROC curve was used to evaluate the effect of SHR to predict 90-day prognosis. Spearman correlation was used to analyze the correlation between SHR and clinical factors. Results (1) A total of 1484 patients were included,with the median age of 70 (62-80) years and 948 males (63.9%). The median baseline NIHSS score was 3 (2-7). There were 923 cases (62.2%) in favorable prognosis group and 561 cases (37.8%) in unfavorable prognosis group. (2) Univariate analysis showed that the SHR in favorable prognosis group was significantly lower than that in unfavorable prognosis group [0.82 (0.72-0.95) vs . 0.86 (0.74-1.02), P =0.001]. (3) Multivariate logistic regression analysis showed that compared with the lowest quartile of SHR, the highest quartile was independently associated with the 90-day unfavorable prognosis (OR 2.22, 95%CI 1.26-3.91, P =0.006), which had statistical difference in non-diabetic group in subgroup analysis (OR 2.11, 95%CI 1.19-3.75, P =0.010), and no statistical difference in diabetic group (OR 1.53, 95%CI 0.69-3.42, P =0.298). (4) The area under the ROC curve (C-value) of SHR for predicting 90-day unfavorable prognosis was 0.552 (95%CI 0.526-0.578, P =0.001, the optimal cut-off value was 0.84, the sensitivity was 52.94%, and the specificity was 56.12%); and in non-diabetic subgroup, the C-value was 0.600 (95%CI 0.563-0.637, P

In order to investigate the coal volumetric swelling during CO2 storage, the self-developed MCQ-ⅡCO2-ECBM experimental equipment was used to perform coal deformation through injecting CO2 to meager coal, meager lean coal and weakly caking coal samples （100 mm × 100 mm × 200 mm） with constant injection pressure under 31 MPa bulk stress at 25 ℃. At the same time, the micro-pores were investigated with nine small coal samples （6 mm×6 mm×6 mm） through a micro-CT system. The results show that: At minimum 4. 5 μm observation of CT section structure, the meager coal porosity （4. 67%） is less than that of meager lean coal （5. 39%） and weakly cakingcoal （12. 10%）; During 12 hours of CO2 injection, coal volumetric strain is influenced by pore pressure and CO2 adsorption swelling, which is linearly proportional to the amount of gaseousness CO2 storage under 31 MPa confinement pressure; With the same CO2 storage, the volumetric swelling strain of the meager coal is more than that of the weakly caking coal and meager lean coal; Due to the anisotropy of modulus of elasticity, the radial strain increases faster than the axial strain and both of them are linearly proportional to the amount of gaseousness CO2 storage. [ABSTRACT FROM AUTHOR]

Based on the unsaturated characteristic of medium-high rank coal reservoirs and coalbed methane (CBM) well production data, the material and energy dynamic balance mechanism in middle-high rank CBM systems was revealed by considering the critical desorption pressure as a key parameter. The control action of this mechanism on practical CBM development was also analyzed. Results show that four aspects of the requirements in the field can be realized through using above mechanism, including the real-time monitoring of reservoir pressure and water saturation, the single CBM well recoverable reserves calculation, the reservoir absolute or relative as well as effective permeability dynamic prediction and the productivity dynamic numerical simulation.The higher the relative gas content (the absorbed gas saturation) of the coal reservoirs is, the faster the reservoir pressure and water saturation decline, the easier the CBM desorption is. After the reservoir pressure is under a critical desorption pressure, the longer production time could bring more accurate reserves computation.In the whole process of CBM production, the coal reservoir permeability are unified as the function of reservoir pressure and the unsaturated effective permeability curves can better reflect the positive and negative effects as well as the gas slippage effect. Meanwhile, the unsaturated effective permeability model is more accurate and precise than that of the saturated effective permeability model in the CBM well productivity prediction. [ABSTRACT FROM AUTHOR]