3,004 research outputs found
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Wintertime Transport of Reactive Trace Gases From East Asia Into the Deep Tropics
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Maximal Information Coefficient Based Residential Photovoltaic Power Generation Disaggregation
Due to policy support, low cost and easy
applicability, distribution photovoltaic systems (DPVSs) are
increasingly popular among residential community. However,
small-scale DPVSs of less than 10 kWp are always installed
behind the meter (BTM), which results in the invisible of the
photovoltaic (PV) power generation. Only access of composite
power data can result in non-optimal distribution network
control and optimization, leading to a series of energy
management problems. In order to solve the aforementioned
problems, this paper proposes a BTM composite power
disaggregation method focusing on small-scale DPVSs, with
only composite power data of residential users in a community,
without relying on weather data and models assumption.
Considering that community users’ DPVSs usually exhibit
approximate output characteristics, neighboring composite
power is used to extract PV power generation information as
mutual proxies. After obtaining approximate PV proxy data by
subtracting composite power of inter-users, a grid search
algorithm guided by Maximal Information Coefficient (MIC) is
performed to obtain final PV power generation disaggregation
results. The proposed method is evaluated using data gathered
from residential customers located in Ithaca, New York and
Austin, Texas in real-life scenarios. Testing results show that
our proposed method achieve considerable disaggregation
accuracy in the absence of solar radiation and temperature
data as compared to other state-of-art methods
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Deep autoencoder with localized stochastic sensitivity for short-term load forecasting
National Natural Science Foundation of China; Guangdong Province Science and Technology Plan Project; Brunel University London; UK BRIEF Funding; Department of Finance and Education of Guangdong Province 2016; Key Discipline Construction Program, China; Education Department of Guangdong Province: New and Integrated Energy System Theory and Technology Research Grou
Dimeric SecA Couples the Preprotein Translocation in an Asymmetric Manner
The Sec translocase mediates the post-translational translocation of a number of preproteins through the inner membrane in bacteria. In the initiatory translocation step, SecB targets the preprotein to the translocase by specific interaction with its receptor SecA. The latter is the ATPase of Sec translocase which mediates the post-translational translocation of preprotein through the protein-conducting channel SecYEG in the bacterial inner membrane. We examined the structures of Escherichia coli Sec intermediates in solution as visualized by negatively stained electron microscopy in order to probe the oligomeric states of SecA during this process. The symmetric interaction pattern between the SecA dimer and SecB becomes asymmetric in the presence of proOmpA, and one of the SecA protomers predominantly binds to SecB/proOmpA. Our results suggest that during preprotein translocation, the two SecA protomers are different in structure and may play different roles
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A new interpretation of total column BrO during Arctic spring
Emission of bromine from sea-salt aerosol, frost flowers, ice leads, and snow results in the nearly complete removal of surface ozone during Arctic spring. Regions of enhanced total column BrO observed by satellites have traditionally been associated with these emissions. However, airborne measurements of BrO and O3 within the convective boundary layer (CBL) during the ARCTAS and ARCPAC field campaigns at times bear little relation to enhanced column BrO. We show that the locations of numerous satellite BrO "hotspots" during Arctic spring are consistent with observations of total column ozone and tropopause height, suggesting a stratospheric origin to these regions of elevated BrO. Tropospheric enhancements of BrO large enough to affect the column abundance are also observed, with important contributions originating from above the CBL. Closure of the budget for total column BrO, albeit with significant uncertainty, is achieved by summing observed tropospheric partial columns with calculated stratospheric partial columns provided that natural, short-lived biogenic bromocarbons supply between 5 and 10 ppt of bromine to the Arctic lowermost stratosphere. Proper understanding of bromine and its effects on atmospheric composition requires accurate treatment of geographic variations in column BrO originating from both the stratosphere and troposphere. Copyright 2010 by the American Geophysical Union
Lung Cancer in Pulmonary Fibrosis: Tales of Epithelial Cell Plasticity
Lung epithelial cells exhibit a high degree of plasticity. Alterations to lung epithelial cell function are critically involved in several chronic lung diseases such as pulmonary fibrosis. Pulmonary fibrosis is characterized by repetitive injury and subsequent impaired repair of epithelial cells, which leads to aberrant growth factor activation and fibroblast accumulation. Increased proliferation and hyper- and metaplasia of epithelial cells upon injury have also been observed in pulmonary fibrosis; this epithelial cell activation might represent the basis for lung cancer development. Indeed, several studies have provided histopathological evidence of an increased incidence of lung cancer in pulmonary fibrosis. The mechanisms involved in the development of cancer in pulmonary fibrosis, however, remain poorly understood. This review highlights recently uncovered molecular mechanisms shared between lung cancer and fibrosis, which extend the current evidence of a common trait of cancer and fibrosis, as provided by histopathological observations. Copyright (C) 2011 S. Karger AG, Base
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