n-Type conjugated polymers (CPs) are crucial in the applications of organic electronics. Direct coupling of electron-deficient C−H monomer via selective C−H activation, namely C−H/C−H oxidative direct arylation polyco...
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n-Type conjugated polymers (CPs) are crucial in the applications of organic electronics. Direct coupling of electron-deficient C−H monomer via selective C−H activation, namely C−H/C−H oxidative direct arylation polycondensation (Oxi-DArP), is an ideal approach toward such CPs. Herein, Oxi-DArP is firstly adopted to synthesize a high-performance n-type CP using a newly developed monomer, i.e., 3,6-di(thiazol-5-yl)-diketopyrrolopyrrole (Tz-5-DPP). Tz-5-DPP based homopolymer PTz - 5 - DPP with a molecular weight of 22 kDa has been synthesized via Oxi-DArP. After n-doping, PTz - 5 - DPP films exhibited electric conductivity values up to 8 S cm −1 and power factors ( PFs ) up to 106 μW m −1 K −2 . Notably, this PF value is the highest for n-type polymer thermoelectric materials to date. The Oxi-DArP synthesis and the excellent n-type performance of the polymer make this work an important step toward the straightforward and sustainable preparation of high-performance n-type polymer semiconductors.
Recently, heat treatment in the range of 250 degrees C-500 degrees C has been attempted with the aim of improving the quality factor (Q) of superconducting radio-frequency (SRF) cavities worldwide. Herein, medium-temp...
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Recently, heat treatment in the range of 250 degrees C-500 degrees C has been attempted with the aim of improving the quality factor (Q) of superconducting radio-frequency (SRF) cavities worldwide. Herein, medium-temperature (mid-T) furnace baking experiments were conducted at the Institute of High Energy Physics to obtain higher Q values. First, 1.3 GHz 1-cell cavities received mid-T furnace baking at different temperatures, resulting in not only the improvement of Q but also an anti-Q-slope behavior. Furthermore, mid-T furnace baking was applied to six 1.3 GHz 9-cell cavities, all of which indicated higher Q and anti-Q-slope behavior. The average Q was 3.8 x 10(10) at 16 MV m(-1). The maximum gradients of the 9-cell cavities were 22.7-26.5 MV m(-1). Finally, the mid-T furnace baked 1.3 GHz 9-cell cavities were welded with helium vessel, with no degradation in the vertical tests. In addition, the mid-T furnace baking process was simplified in comparison with European X-ray Free Electron Laser and Linear Coherent Light Source because of the cancellation of light electro-polishing. This simplification is beneficial in the mass production of SRF cavities with high Q, which are widely adopted in free electron lasers and high-energy colliders.
Process-in-Memory (PIM) has become a favorable solution for data intensive applications with its advantages of placing processing units in or near memory, reducing the movement of data between memory and processing un...
Process-in-Memory (PIM) has become a favorable solution for data intensive applications with its advantages of placing processing units in or near memory, reducing the movement of data between memory and processing unit. However, most recent PIM platforms have relatively large limitations in terms of computing flexibility and types of computing, and programming is complicated, which cannot provide a unified programming framework. Therefore, it becomes a challenge to deploy the code to the hardware, which severely restricts the application development on the PIM platform. This paper presents a method of code conversion based on the PIM platform, which allows users to develop applications on the PIM platform with the high-level programming language, makes the PIM platform more accessible in the development of data intensive applications.
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