The Compressed Baryonic Matter (CBM) is a physics experiment aiming to investigate rare probes of the dense phase of strongly interacting matter with unprecedented accuracy by designing all components of the experiment for an interaction rate of 10 MHz. The CBM Time Of Flight (TOF) detector needs Multi-gap Resistive Plate Chambers (MRPCs) with high rate capability reaching 25 kHz/cm 2. A new kind of high rate MRPC built with newly developed low resistive glass sheets has a rate capability up to 70 kHz/cm 2 , meeting the requirement of CBM. The glass has a resistivity in the order of 10 10 Ω‧ cm. It can be used to build high rate MRPCs with different structures. The final version of the high rate MRPC for CBM is called MRPC3a, which has been put into mass production. Performance of MRPC3a is studied via a cosmic ray test system in Tsinghua University. Test results show that MRPC3a has excellent performance with the time resolution better than 90 ps at efficiency higher than 95%. The mini-CBM (mCBM) TOF wall and the Solenoidal Tracker at RHIC (STAR) end-cap TOF (eTOF) are two detectors that firstly adopt MRPC3a. The application of MRPC3a on STAR eTOF shows time resolution better than 100 ps by preliminary analysis and the mCBM TOF wall is ready for beam test. The working gas mixture for MRPC3a in the eTOF is different from the standard working gas mixture in the CBM. But the performance of MRPC3a is stable when working without SF6 in the eTOF.
Nowadays, heavy metal
pollution has attracted wide attention. Many
electrochemical methods have been developed to detect heavy metal
ions. The electrode surface usually needs to be modified, and the
process is complicated. Herein, we demonstrate the fabrication of
electrodes by direct laser sintering on commercial polymer films.
The prepared porous carbon electrodes can be used directly without
any modification. The electrodes were fixed in a 3D-printed flow reactor,
which led to very little analyte required during the detection process.
The velocities of the analyte under stirring and flowing conditions
were simulated numerically. The results prove that flow detection
is more conducive to improving detection sensitivity. The limit of
detection is about 0.0330 mg/L for Pb
2+
. Moreover, the
electrode has been proved to have good repeatability and stability.
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