2,225 research outputs found
Current stage of the ATCA follow-up for SPLASH
Four ground-state OH transitions were detected in emission, absorption and
maser emission in the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH).
We re-observed these OH masers with the Australia Telescope Compact Array to
obtain positions with high accuracy (~1 arcsec). According to the positions, we
categorised these OH masers into different classes, i.e. star formation,
evolved stars, supernova remnants and unknown origin. We found one interesting
OH maser source (G336.644-0.695) in the pilot region, which has been studied in
detail in Qiao et al. (2016a). In this paper, we present the current stage of
the ATCA follow-up for SPLASH and discuss the potential future researches
derived from the ATCA data.Comment: 2 pages, conference, IAU symposium 33
Polygamy relations of multipartite systems
We investigate the polygamy relations of multipartite quantum states. General
polygamy inequalities are given in the th power of
concurrence of assistance, th power of entanglement of
assistance, and the squared convex-roof extended negativity of assistance
(SCRENoA)
Maldi matrices for the analysis of low molecular weight compounds: rational design, challenges and perspectives
The analysis of low molecular weight (LMW) compounds is of great interest to detect small pharmaceutical drugs rapidly and sensitively, or to trace and understand metabolic pathways. Matrixâassisted laser desorption/ionization mass spectrometry (MALDI MS) plays a central role in the analysis of high molecular weight (bio)molecules. However, its application for LMW compounds is restricted by spectral interferences in the low m/z region, which are produced by conventional organic matrices. Several strategies regarding sample preparation have been investigated to overcome this problem. A different rationale is centred on developing new matrices which not only meet the fundamental requirements of good absorption and high ionization efficiency, but are also vacuum stable and âMALDI silentâ, i.âe., do not give matrixârelated signals in the LMW area. This review gives an overview on the rational design strategies used to develop matrix systems for the analysis of LMW compounds, focusing on (i) the modification of wellâknown matrices, (ii) the search for high molecular weight matrices, (iii) the development of binary, hybrid and nanomaterialâbased matrices, (iv) the advance of reactive matrices and (v) the progress made regarding matrices for negative or dual polarity mode.To use MALDI MS and MS imaging for the analysis of low molecular weight (LMW) analytes, new matrix systems are needed which combine suitable absorption and high ionization efficiency in dual polarity mode with being vacuum stable and âMALDI silentâ, i.e., enabling noiseâfree measurements in the LMW area. This Minireview summarizes recent research regarding the design and synthesis of such matrices, and discusses recurring design strategies and motifs. imag
Comparison of centralised and distributed battery energy storage systems in LV distribution networks on operational optimisation and financial benefits
The integration of renewable energy sources and plug-in electric vehicles (PEVs) into the existing low-voltage (LV) distribution network at a high penetration level can cause reverse power flow, increased overall energy demand, network congestion, voltage rise/dip, transformer overloading and other operational issues. In this study, these potentially negative impacts caused by increasing penetration of distributed energy resources and PEVs are stochastically quantified based on a real practical 400 V distribution network as a case study. Battery energy storage (BES) is known to be a promising method for peak shaving and to provide network ancillary services. Two types of BES implementations aiming at distinctive charging and discharging targets without communication infrastructure or control centre are proposed and simulated. Optimisation results and potential financial profit of these two BES systems are compared and discussed in detail
Low-voltage distribution network reconfiguration considering high penetration of electric vehicles:a UK case study
Network reconfiguration is one of the electricity network optimization techniques for losses reduction and load balancing by changing the open-closed status of sectionalized switches. In this paper, an application of network reconfiguration in low-voltage (LV) domestic distribution network with high penetration of electric vehicles (EVs) is presented. Firstly, high resolution time-series domestic load profiles are generated and validated with measured data at substation. Electric vehicle charging profiles at both fast and slow charging modes are modelled and produced. Then the impact of increasing penetration of EVs on the network thermal and voltage constraints is quantified. To optimize the network topology, suitable locations of newly-installed switches and their operational time are identified by branch-exchange method and exhaustive search algorithm (ESA) due to the small size of network and less potential location. The proposed approach is applied to two practical 400V LV distribution networks interconnected by underground linkboxes which are used to provide back-feeds during routine maintenances or emergency conditions. By adding new sectionalized switches, the LV network will obtain more operational flexibility and could better explore its potential for further study under Smart Grid scenarios
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