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Chitosan-based porous carbon as a support for Zn-based catalysts in acetylene acetoxylation
Junyu Zhang,Fulong Zhu,Ying Zhang,Mingyuan Zhu,Hongling Li,Bin Dai 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Using the biomass material chitosan as a precursor and potassium citrate (PC) as a substitute for traditionalcorrosive activators such as KOH and ZnCl2, a chitosan-based porous carbon material with high specific surfacearea was successfully prepared and used as a support for the catalytic acetylene acetoxylation reaction. By controllingthe PC content and the calcination temperature, chitosan-based porous carbon with a suitable pore structure and abundantsurface oxygen functional groups was obtained. The inductively coupled plasma analysis confirmed that the zinccontent of the 0.9Zn/CS-PC1-800 catalyst was about 14 wt%, and the acetic acid conversion reached 81%. Furthermore,the scanning electron microscopy and Brunauer-Emmett-Teller (BET) analysis showed that the catalyst carrierwas mesoporous carbon material, and different PC content formed different pore size distribution at different calcinationtemperatures. In addition, X-ray photoelectron spectroscopy analysis demonstrated that the content of O in chitosan-based porous carbon was rich, and PC consumed the O content on the surface of carbon materials duringactivation. Because O content and pore size structure on carrier surface are closely related to acetic acid conversion,reasonable PC content and calcination temperature are very important for acetic acid conversion.
The Novel Efficient Dual-field FIPS Modular Multiplication
( Tingting Zhang ),( Junru Zhu ),( Yang Liu ),( Fulong Chen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.2
The modular multiplication is the key module of public-key cryptosystems such as RSA (Rivest-Shamir-Adleman) and ECC (Elliptic Curve Cryptography). However, the efficiency of the modular multiplication, especially the modular square, is very low. In order to reduce their operation cycles and power consumption, and improve the efficiency of the public-key cryptosystems, a dual-field efficient FIPS (Finely Integrated Product Scanning) modular multiplication algorithm is proposed. The algorithm makes a full use of the correlation of the data in the case of equal operands so as to avoid some redundant operations. The experimental results show that the operation speed of the modular square is increased by 23.8% compared to the traditional algorithm after the multiplication and addition operations are reduced about (s<sup>2</sup>-s)/2, and the read operations are reduced about s<sup>2</sup>-s, where s=n/32 for n-bit operands. In addition, since the algorithm supports the length scalable and dual-field modular multiplication, distinct applications focused on performance or cost could be satisfied by adjusting the relevant parameters.
Whole Exome Sequencing in the Accurate Diagnosis of Bilateral Breast Cancer: a Case Study
Xiaoling Li,Mei Yang,Qiangzu Zhang,Yanhui Fan,Teng Zhu,Fulong Chen,Kun Wang 한국유방암학회 2019 Journal of breast cancer Vol.22 No.1
When faced with a case of bilateral breast cancer (BBC), understanding how to differentiate bilateral primary breast cancer from contralateral metastatic breast cancer is essential for treatment, but clear identification criteria have not been established to date. Diverse events play different roles in the therapy and prognosis of BBC; hence, it is of great significance to detect a more comprehensive and convincing technique to make an accurate differential diagnosis. We report a rare case of synchronous BBC in a 61-year-old Chinese woman. Based on her clinical and pathological features and the use of whole exome sequencing and cancer genome analysis, we concluded that the patient developed contralateral metastatic breast cancer which metastasized from left to right. Therefore, together with clinical, pathological and cancer genomics information, we could precisely define the origin and evolution of BBC.