检索范围:
排序: 展示方式:
Optimal portfolio design of energy storage devices with financial and physical right market
《能源前沿(英文)》 2022年 第16卷 第1期 页码 95-104 doi: 10.1007/s11708-021-0788-2
关键词: portfolio node price fluctuation transmission right energy storage right risk aversion
Yeli ZENG, Cong DONG, Mikael HÖÖK, Jinhua SUN, Danyang SHI
《能源前沿(英文)》 2020年 第14卷 第4期 页码 726-739 doi: 10.1007/s11708-020-0701-4
关键词: liquefied natural gas price index Shanghai Petroleum and Gas Exchange price discovery market reforms
Power fluctuation and power loss of wind turbines due to wind shear and tower shadow
Binrong WEN, Sha WEI, Kexiang WEI, Wenxian YANG, Zhike PENG, Fulei CHU
《机械工程前沿(英文)》 2017年 第12卷 第3期 页码 321-332 doi: 10.1007/s11465-017-0434-1
The magnitude and stability of power output are two key indices of wind turbines. This study investigates the effects of wind shear and tower shadow on power output in terms of power fluctuation and power loss to estimate the capacity and quality of the power generated by a wind turbine. First, wind speed models, particularly the wind shear model and the tower shadow model, are described in detail. The widely accepted tower shadow model is modified in view of the cone-shaped towers of modern large-scale wind turbines. Power fluctuation and power loss due to wind shear and tower shadow are analyzed by performing theoretical calculations and case analysis within the framework of a modified version of blade element momentum theory. Results indicate that power fluctuation is mainly caused by tower shadow, whereas power loss is primarily induced by wind shear. Under steady wind conditions, power loss can be divided into wind farm loss and rotor loss. Wind farm loss is constant at 3α(3α−1)R2/(8H2). By contrast, rotor loss is strongly influenced by the wind turbine control strategies and wind speed. That is, when the wind speed is measured in a region where a variable-speed controller works, the rotor loss stabilizes around zero, but when the wind speed is measured in a region where the blade pitch controller works, the rotor loss increases as the wind speed intensifies. The results of this study can serve as a reference for accurate power estimation and strategy development to mitigate the fluctuations in aerodynamic loads and power output due to wind shear and tower shadow.
关键词: wind turbine wind shear tower shadow power fluctuation power loss
Junying CHU, Hao WANG, Can WANG
《环境科学与工程前沿(英文)》 2013年 第7卷 第5期 页码 688-698 doi: 10.1007/s11783-013-0559-3
关键词: technology selection model optimization water price scenario analysis consumer behavior
A novel light fluctuation spectrum method for in-line particle sizing
Shouxuan QIN, Xiaoshu CAI, Li MA
《能源前沿(英文)》 2012年 第6卷 第1期 页码 89-97 doi: 10.1007/s11708-012-0176-z
关键词: in-line measurement particle size distribution (PSD) incident light intensity particle concentration light fluctuation
Does oil price affect the value of firms? Evidence from Tunisian listed firms
Kaouther ZAABOUTI,Ezzeddine BEN MOHAMED,Abdelfettah BOURI
《能源前沿(英文)》 2016年 第10卷 第1期 页码 1-13 doi: 10.1007/s11708-016-0396-8
关键词: industrial Tunisian firms oil price value of firm stochastic frontier approach
Clinical significance of para-aortic lymph node dissection and prognosis in ovarian cancer
null
《医学前沿(英文)》 2014年 第8卷 第1期 页码 96-100 doi: 10.1007/s11684-014-0316-4
Lymph node metastasis has an important effect on prognosis of patients with ovarian cancer. Moreover, the impact of para-aortic lymph node (PAN) removal on patient prognosis is still unclear. In this study, 80 patients were divided into groups A and B. Group A consisted of 30 patients who underwent PAN+ pelvic lymph node (PLN) dissection, whereas group B consisted of 50 patients who only underwent PLN dissection. Analysis of the correlation between PAN clearance and prognosis in epithelial ovarian cancer was conducted. Nineteen cases of lymph node metastasis were found in group A, among whom seven cases were positive for PAN, three cases for PLN, and nine cases for both PAN and PLN. In group B, 13 cases were positive for lymph node metastasis. Our study suggested that the metastatic rate of lymph node is 40.0%. Lymph node metastasis was significantly correlated with FIGO stage, tumor differentiation, and histological type both in groups A and B (P<0.05). In groups A and B, the three-year survival rates were 77.9% and 69.0%, and the five-year survival rates were 46.7% and 39.2%, respectively. However, the difference was not statistically significant (P>0.05). The three-year survival rates of PLN metastasis in groups A and B were 68.5% and 41.4%, and the five-year survival rates were 49.7% and 26.4%, respectively. Furthermore, PLN-positive patients who cleared PAN had significantly higher survival rate (P=0.044). In group A, the three-year survival rates of positive and negative lymph nodes were 43.5% and 72.7%, and the five-year survival rates were 27.2% and 58.5%, respectively. The difference was statistically significant (P=0.048). Cox model analysis of single factor suggested that lymph node status affected the survival rate (P<0.01), which was the death risk factor. Consequently, in ovarian carcinoma cytoreductive surgery, resection of the para-aortic lymph node, which has an important function in clinical treatment and prognosis of patients with ovarian cancer, is necessary.
关键词: ovarian cancer para-aortic lymph node pelvic lymph node
Macroeconomic impacts of oil price volatility: mitigation and resilience
Zoheir EBRAHIM, Oliver R. INDERWILDI, David A. KING
《能源前沿(英文)》 2014年 第8卷 第1期 页码 9-24 doi: 10.1007/s11708-014-0303-0
关键词: conventional oil price volatility macroeconomy economic stability energy security
Direct energy rebound effect for road transportation in China
《工程管理前沿(英文)》 页码 597-611 doi: 10.1007/s42524-023-0276-y
关键词: road transportation direct energy rebound effect asymmetric price effects panel data model
S. Surender REDDY,Chan-Mook JUNG,Ko Jun SEOG
《能源前沿(英文)》 2016年 第10卷 第1期 页码 105-113 doi: 10.1007/s11708-016-0393-y
关键词: day-ahead electricity markets price forecasting load forecasting artificial neural networks load serving entities
Md SARWAR,Anwar Shahzad SIDDIQUI
《能源前沿(英文)》 2016年 第10卷 第2期 页码 240-248 doi: 10.1007/s11708-016-0404-z
关键词: locational marginal price (LMP) distributed generation pool market deregulated electricity market congestion management
Spatial embedded reinforcement of 20-node block element for analysis PC bridges
LONG Peiheng, DU Xianting, CHEN Weizhen
《结构与土木工程前沿(英文)》 2008年 第2卷 第3期 页码 274-280 doi: 10.1007/s11709-008-0039-1
关键词: arithmetic analysis calculation prestressed reinforcement mechanical arbitrary
Jiayi Wu, Weiqi Gao, Xiaosong Chen, Chunxiao Fei, Lin Lin, Weiguo Chen, Ou Huang, Siji Zhu, Jianrong He, Yafen Li, Li Zhu, Kunwei Shen
《医学前沿(英文)》 2021年 第15卷 第4期 页码 621-628 doi: 10.1007/s11684-020-0738-0
关键词: early breast cancer 21-gene assay recurrence score prognosis
朱庄生,王庆,万德钧
《中国工程科学》 2009年 第11卷 第8期 页码 83-87
利用传统的基于节点连接的道路网络模型来表达真实世界中的道路网络,其存在的缺陷越来越突出,大大降低了导航系统的鲁棒性。为了消除这些缺陷,首次提出一个新的道路网络模型,即基于虚拟节点连接的道路网络模型,其虚拟节点是汇交路段的各个端点所围成的区域,具有真实道路路口的形状,与传统模型相比,该模型更能表达真实世界道路网络中的交通流,所以它能更好地满足地图匹配理论要求。另外,该模型能很好的表达真实道路路口参数,所以它在交通规划,交通管理和交通流模拟中都有着十分广阔的应用前景。
标题 作者 时间 类型 操作
Can the Shanghai LNG Price Index indicate Chinese market?An econometric investigation using price discovery theory
Yeli ZENG, Cong DONG, Mikael HÖÖK, Jinhua SUN, Danyang SHI
期刊论文
Power fluctuation and power loss of wind turbines due to wind shear and tower shadow
Binrong WEN, Sha WEI, Kexiang WEI, Wenxian YANG, Zhike PENG, Fulei CHU
期刊论文
Exploring price effects on the residential water conservation technology diffusion process: a case study
Junying CHU, Hao WANG, Can WANG
期刊论文
A novel light fluctuation spectrum method for in-line particle sizing
Shouxuan QIN, Xiaoshu CAI, Li MA
期刊论文
Does oil price affect the value of firms? Evidence from Tunisian listed firms
Kaouther ZAABOUTI,Ezzeddine BEN MOHAMED,Abdelfettah BOURI
期刊论文
Clinical significance of para-aortic lymph node dissection and prognosis in ovarian cancer
null
期刊论文
Macroeconomic impacts of oil price volatility: mitigation and resilience
Zoheir EBRAHIM, Oliver R. INDERWILDI, David A. KING
期刊论文
Day-ahead electricity price forecasting using back propagation neural networks and weighted least square
S. Surender REDDY,Chan-Mook JUNG,Ko Jun SEOG
期刊论文
An approach to locational marginal price based zonal congestion management in deregulated electricity
Md SARWAR,Anwar Shahzad SIDDIQUI
期刊论文
Spatial embedded reinforcement of 20-node block element for analysis PC bridges
LONG Peiheng, DU Xianting, CHEN Weizhen
期刊论文
Prognostic value of the 21-gene recurrence score in ER-positive, HER2-negative, node-positive breastcancer was similar in node-negative diseases: a single-center study of 800 patients
Jiayi Wu, Weiqi Gao, Xiaosong Chen, Chunxiao Fei, Lin Lin, Weiguo Chen, Ou Huang, Siji Zhu, Jianrong He, Yafen Li, Li Zhu, Kunwei Shen
期刊论文