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Numerical simulations of high pressure carbon dioxide fluid fluidized beds

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Particuology 2023年第7期78卷 1-15页

作者： Wenjan Cai Xietian Xia Xiang Li Xing Chen zenghui xu Huilin Lu School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China China Construction Eco-Environmental Protection Technology Co. Ltd.Suzhou215100China

Hydrodynamics of carbon dioxide fluid-particle mixtures are predicted using a low density ratio-based kinetic theory of granular flow in high pressure carbon dioxide fluid fluidized beds.A coexistence of particle waves and particle aggregates exists along bed *** threshold to identify the occurrence of particle aggregates is suggested based on standard deviation of solid volume fractions in aggregative *** existence time fractions and frequencies of particle aggregates are predicted along axial *** effect of carbon dioxide fluid temperature and pressure on volume fraction and velocity distributions are analyzed at different inlet carbon dioxide velocities and particle densities in high pressure carbon dioxide fluidized *** results indicate that the carbon dioxide-particles fluidization transits from particulate to aggregative states with the increase of inlet carbon dioxide *** computed fluid volume fractions and heterogeneity indexes are close to the measurements in a high pressure carbon dioxide fluidized bed.

关键词： High pressure carbon dioxide Fluidized bed Transition Aggregative fluidization Particulate fluidization Kinetic theory of granular flow

A Text Image Watermarking Algorithm Based on Image Enhancement

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Computers, Materials & Continua 2023年第10期77卷 1183-1207页

作者： Baowei Wang Luyao Shen Junhao Zhang zenghui xu Neng Wang School of Computer Nanjing University of Information Science and TechnologyCollaborative Innovation Center of Jiangsu Atmospheric Environment and Equipment TechnologyDigital Forensics Engineering Research Center of Digital Forensics Ministry of EducationNanjing210044China School of Software Nanjing University of Information Science and TechnologyNanjing210044China

Digital watermarking technology is adequate for copyright protection and content *** needs to be more research on the watermarking algorithm after printing and *** at the problem that existing anti-print scanning text image watermarking algorithms cannot take into account the invisibility and robustness of the watermark,an anti-print scanning watermarking algorithm suitable for text images is *** algorithm first performs a series of image enhancement preprocessing operations on the printed scanned image to eliminate the interference of incorrect bit information on watermark embedding and then uses a combination of Discrete Wavelet Transform(DWT)-Singular Value Decomposition(SVD)to embed the *** show that the average Normalized Correlation(NC)of the watermark extracted by this algorithm against attacks such as Joint Photographic Experts Group(JPEG)compression,JPEG2000 compression,and print scanning is above ***,the average NC of the watermark extracted after print scanning attacks is greater than 0.964,and the average Bit Error Ratio(BER)is 5.15%.This indicates that this algorithm has strong resistance to various attacks and print scanning attacks and can better take into account the invisibility of the watermark.

关键词： Print-resistant scanning image enhancement DWT SVD embedding intensity

Deletion and Recovery Scheme of Electronic Health Records Based onMedical Certificate Blockchain

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Computers, Materials & Continua 2023年第7期76卷 849-859页

作者： Baowei Wang Neng Wang Yuxiao Zhang zenghui xu Junhao Zhang School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210044JiangsuChina Engineering Research Center of Digital Forensics Ministry of EducationNanjing210044JiangsuChina

The trusted sharing of Electronic Health Records(EHRs)can realize the efficient use of medical data *** speaking,EHRs are widely used in blockchain-based medical data *** are valuable private assets of patients,and the ownership belongs to *** recent research has shown that patients can freely and effectively delete the EHRs stored in hospitals,it does not address the challenge of record sharing when patients revisit *** order to solve this problem,this paper proposes a deletion and recovery scheme of EHRs based on Medical Certificate *** paper uses cross-chain technology to connect the Medical Certificate Blockchain and the Hospital Blockchain to real-ize the recovery of deleted *** the same time,this paper uses the Medical Certificate Blockchain and the InterPlanetary File System(IPFS)to store Personal Health Records,which are generated by patients visiting different medical *** addition,this paper also combines digital watermarking technology to ensure the authenticity of the restored electronic medical *** the combined effect of blockchain technology and digital watermarking,our proposal will not be affected by any other rights throughout the *** analysis and security analysis illustrate the completeness and feasibility of the scheme.

关键词： Electronic health records cross-chain medical certificate blockchain data deletion and recovery

Monitoring checkpoint inhibitors:predictive biomarkers in immunotherapy

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Frontiers of Medicine 2019年第1期13卷 32-44页

作者： Min Zhang Jingwen Yang Wenjing Hua Zhong Li zenghui xu Qijun Qian ShangHai Cell Therapy Group Co. Ltd.Shanghai 201805China

Immunotherapy has become the fourth cancer therapy after surgery, chemotherapy, and radiotherapy. In particular, immune checkpoint inhibitors are proved to be unprecedentedly in increasing the overall survival rates of patients with refractory cancers, such as advanced melanoma, non-small cell lung cancer, and renal cell carcinoma. However, inhibitor therapies are only effective in a small proportion of patients with problems, such as side effects and high costs. Therefore, doctors urgently need reliable predictive biomarkers for checkpoint inhibitor therapies to choose the optimal therapies. Here, we review the biomarkers that can serve as potential predictors of the outcomes of immune checkpoint inhibitor treatment, including tumor-specific profiles and tumor microenvironment evaluation and other factors.

关键词： immune checkpoint companion diagnosis PD-L1 tumor mutation burden immune score

A double-layer radiative cooling coating that utilizes the refractive index difference between layers to achieve extremely high solar reflectivity

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Science China(Technological Sciences) 2024年第10期67卷 3182-3189页

作者： WANG FuQiang LI ChunZhe YANG ZhenNing XIE WeiXin LI Xiang xu zenghui YAN YuYing CHENG ZiMing School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China China Construction Eco-Environmental Protection Technology Co. Ltd.Suzhou 215123China Faculty of Engineering University of NottinghamNottingham NG72RDUK

Passive daytime radiative cooling(PDRC)technology has great potential in reducing cooling energy *** order to further improve the spectral performance of PDRC coatings,current researchers mostly focus on the selection and size design of functional particles,while ignoring the optical properties enhancement effect caused by the interlayer *** this study,based on the principle that the refractive index difference between layers enhanced the backscattering performance of the solar spectrum,we proposed and manufactured a double-layer PDRC coating with polyvinylidene difluoride(PVDF)as the filmforming material in the upper layer and polydimethylsiloxane(PDMS)as the film-forming material in the lower layer,both filled with Al_(2)O_(3) and SiO_(2) *** double-layer PDRC coating exhibited excellent spectral performance that a high solar reflectivity of 98%and an emissivity of 0.95 at the“atmospheric window”*** comparison,the solar spectrum reflectivity of the single-layer PDRC coatings based on PVDF and PDMS of the same thickness was 95%and 94.7%,*** tests showed that the PDRC coating achieved a temperature decrease of up to 7.1℃ under direct sunlight at noon *** addition,the PDRC coating had excellent weather resistance,water resistance,and other basic *** article opens up a new idea and provides methodological guidance for the design of double-layer PDRC coatings.

关键词： double-layer radiative cooling coating spectral modulation interlayer refractive index solar energy radiative transfer

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桐城派与《清史稿》的编修

史学史研究 2016年第2期 27-35页

作者：许曾会安徽大学历史系安徽合肥230601

民国初年桐城派学人马其昶、姚永朴、姚永概等入史馆参与编修清史。他们久居史馆,主修列传,辅以书志,为成一代名史而兢兢业业。他们将"辞章、考据、义理"与"才、学、识"相联系,在编修清史过程中注重史料的搜集、运用,追求史事真实,在文... 详细信息

民国初年桐城派学人马其昶、姚永朴、姚永概等入史馆参与编修清史。他们久居史馆,主修列传,辅以书志,为成一代名史而兢兢业业。他们将"辞章、考据、义理"与"才、学、识"相联系,在编修清史过程中注重史料的搜集、运用,追求史事真实,在文辞上颇守家法。他们所修史稿虽然由于种种原因大多未被《清史稿》收入,但不能抹杀他们所付出的辛勤努力。

关键词：桐城派《清史稿》马其昶姚永朴姚永概

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袁世凯与桐城派

史学月刊 2019年第9期 69-75页

作者：许曾会安徽大学历史系

袁世凯与桐城派关系密切,在袁世凯生平中的一些重要阶段都有着桐城派的身影存在。袁世凯发迹之时的贵人吴长庆,后保荐其任直隶总督的李鸿章,都深受桐城派影响。袁世凯总督直隶时先后建校士馆、文学馆,聘请桐城派学人为师,亲为桐城派学... 详细信息

袁世凯与桐城派关系密切,在袁世凯生平中的一些重要阶段都有着桐城派的身影存在。袁世凯发迹之时的贵人吴长庆,后保荐其任直隶总督的李鸿章,都深受桐城派影响。袁世凯总督直隶时先后建校士馆、文学馆,聘请桐城派学人为师,亲为桐城派学人著作作序,大力宣扬桐城派古文。民初总统任上亦不忘提携,积极支持,桐城派得以在北京大学和清史馆一度占据重要位置。清末民初之际,为助其施政,袁世凯网罗任用了一批桐城派名流于其幕下,他们对教育、经济、政治变革多是积极参与。袁世凯与桐城派之间的政学互动,无疑对近代中国的历史演变产生了一定影响。

关键词：清末民初袁世凯桐城派

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乘时建树:北方桐城派与清末直隶新政

安徽大学学报（哲学社会科学版） 2023年第3期47卷 50-58页

作者：许曾会安徽大学历史学院安徽合肥230039

后期桐城派领袖吴汝纶在直隶为官为教三十年,门下弟子数千人,直隶地区由此形成北方桐城派。直隶一批年轻辈的桐城派人士既有科举功名又有海外留学经历,视野开阔,思想开放。他们在清末新政运动中,主导直隶教育近代化的改革,推动直隶立宪... 详细信息

后期桐城派领袖吴汝纶在直隶为官为教三十年,门下弟子数千人,直隶地区由此形成北方桐城派。直隶一批年轻辈的桐城派人士既有科举功名又有海外留学经历,视野开阔,思想开放。他们在清末新政运动中,主导直隶教育近代化的改革,推动直隶立宪运动的发展,参与直隶警政的建设,还通过倡导不缠足、禁烟、官话简字等引导直隶地区社会风俗的改良和国民素质的提高。清末直隶的桐城派不以文章为务,而是讲求读书致用、经世济民,为新政改革做出了一定贡献。

关键词：清末新政桐城派直隶

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High-efficiency all-dielectric transmission metasurface for linearly polarized light in the visible region

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Photonics Research 2018年第6期6卷 517-524页

作者： LIU YANG DONG WU YUMIN LIU CHANG LIU zenghui xu HUI LI ZHONGYUAN YU LI YU RAN YE State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876 China School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

We propose and numerically investigate an efficient transmission-mode metasurface that consists of quasi- continuous trapezoid-shaped crystalline silicon nanoantennas on a quartz substrate. This metasurface provides a linear phase gradient and realizes both full 2Jr phase shift and high transmission efficiency in the operating wavelength range from 740 to 780 nm. At the central wavelength around 751 nm, the total transmission efficiency is up to 88.0% and the section of the desired anomalous refraction is 80.4%. The anomalous refraction angle is 29.62°, and larger refraction angle can be achieved by changing the period of the super cell. We demonstrate a refraction angle as large as 38.59°, and the anomalous transmission efficiency reaches 76.6% at wavelength of 741 nm. It is worth mentioning that the structure is much simpler than conventional metasurfaces based on arrays of discrete nanoantennas. Our research may pave the way for designing efficient all-dielectric phase-gradient metasurfaces and applying them in integrated optical devices for wavefront control.

关键词： Metamaterials Phase shift Integrated optics devices