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Photophysical Properties and Photovoltaic Performance of Sensitizers with a Bipyrimidine Acceptor

Transactions of Tianjin University 2024年第5期30卷 406-418页

作者： Shiling Liu kun gong Wei Li Dongzhi Liu Xueqin Zhou School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and EngineeringTianjin Engineering Research Center of Functional Fine ChemicalsTianjin UniversityTianjin 300072China

Molecular engineering is a crucial strategy for improving the photovoltaic performance of dye-sensitized solar cells(DSSCs). Despite the common use of the donor-π bridge-acceptor architecture in designing sensitizers, the underlying structure-performance relationship remains not fully understood. In this study, we synthesized and characterized three sensitizers: MOTP-Pyc, MOS_(2)P-Pyc, and MOTS_(2)P-Pyc, all featuring a bipyrimidine acceptor. Absorption spectra, cyclic voltammetry, and transient photoluminescence spectra reveal a photo-induced electron transfer(PET) process in the excited sensitizers. Electron spin resonance spectroscopy confirmed the presence of charge-separated states. The varying donor and π-bridge structures among the three sensitizers led to differences in their conjugation effect, influencing light absorption abilities and PET processes and ultimately impacting the photovoltaic performance. Among the synthesized sensitizers, MOTP-Pyc demonstrated a DSSC efficiency of 3.04%. Introducing an additional thienothiophene block into the π-bridge improved the DSSC efficiency to 4.47% for MOTS_(2)P-Pyc. Conversely, replacing the phenyl group with a thienothiophene block reduced DSSC efficiency to 2.14% for MOS_(2)P-Pyc. Given the proton-accepting ability of the bipyrimidine module, we treated the dye-sensitized TiO_(2) photoanodes with hydroiodic acid(HI), significantly broadening the light absorption range. This treatment greatly enhanced the short-circuit current density of DSSCs owing to the enhanced electron-withdrawing ability of the acceptor. Consequently, the HI-treated MOTS_(2)P-Pyc-based DSSCs achieved the highest power conversion efficiency of 7.12%, comparable to that of the N719 dye at 7.09%. This work reveals the positive role of bipyrimidine in the design of organic sensitizers for DSSC applications.

关键词： Bipyrimidine acceptor Molecular engineering Photophysical processes Charge separation Dye-sensitized solar cells Acidichromic property

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Albumin–bilirubin grade as a predictor of survival in hepatocellular carcinoma patients with thrombocytopenia

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World Journal of Gastrointestinal Oncology 2024年第5期16卷 1763-1772页

作者： Zhong-Ran Man Xuan-kun gong Kang-Lin Qu Qing Pang Bin-Quan Wu Department of Hepatobiliary Surgery The First Affiliated Hospital of Bengbu Medical CollegeBengbu 233000Anhui ProvinceChina Department of Hepatobiliary Surgery Anhui No.2 Provincial People’s HospitalHefei 230041Anhui ProvinceChina

BACKGROUND The models for assessing liver function,mainly the Child–Pugh(CP),albuminbilirubin(ALBI),and platelet–ALBI(PALBI)classifications,have been validated for use in estimating the prognosis of hepatocellular carcinoma(HCC)***,thrombocytopenia is a common finding and may influence the prognostic value of the three models in *** To investigate and compare the prognostic performance of the above three models in thrombocytopenic HCC *** A total of 135 patients with thrombocytopenic HCC who underwent radical surgery were retrospectively *** scores on the CP,ALBI and PALBI classifications were estimated ***–Meier curves with logrank tests and Cox regression models were used to explore the significant factors associated with overall survival(OS)and recurrence-free survival(RFS).RESULTS The preoperative platelet counts were significantly different among the CP,ALBI and PALBI *** a median follow-up of 28 mo,39.3%(53/135)of the patients experienced postoperative recurrence,and 36.3%(49/135)*** analysis suggested thatα-fetoprotein levels,tumor size,vascular invasion,and ALBI grade were significant predictors of OS and *** to the multivariate Cox regression model,ALBI was identified as an independent prognostic ***,CP and PALBI grades were not statistically significant prognostic *** The ALBI grade,rather than CP or PALBI grade,is a significant prognostic indicator for thrombocytopenic HCC patients.

关键词： Hepatocellular carcinoma Thrombocytopenia Child-Pugh Albumin-bilirubin Platelet-albumin-bilirubin

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Liquid injectivity in a SAG foam process:Effect of permeability

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Petroleum Science 2024年第1期21卷 302-314页

作者： Jia-kun gong Yuan Wang Ridhwan-Zhafri B.Kamarul Bahrim Raj-Deo Tewari Mohammad-Iqbal Mahamad Amir Rouhi Farajzadeh William Rossen College of Mechanics and Materials Hohai UniversityNanjing210098JiangsuChina College of Water Conservancy&Hydropower Engineering Hohai UniversityNanjing210098JiangsuChina PETRONAS Kuala Lumpur50088Malaysia Department of Geoscience and Engineering Delft University of Technology2628 CNDelftthe Netherlands Shell Global Solutions International B.V. 1031 HWAmsterdamthe Netherlands

Foam is utilized in enhanced oil recovery and CO_(2) ***-alternating-gas(SAG)is a preferred approach for placing foam into reservoirs,due to it enhances gas injection and minimizes corrosion in *** previous studies with similar permeability cores show that during SAG injection,several banks occupy the area near the well where fluid exhibits distinct ***,underground reservoirs are heterogeneous,often *** is crucial to understand the effect of permeability on fluid behaviour and injectivity in a SAG *** this work,coreflood experiments are conducted in cores with permeabilities ranging from 16 to 2300 *** observe the same sequence of banks in cores with different ***,the speed at which banks propagate and their overall mobility can vary depending on *** higher permeabilities,the gas-dissolution bank and the forced-imbibition bank progress more rapidly during liquid *** total mobilities of both banks decrease with *** utilizing a bank-propagation model,we scale up our experimental findings and compare them to results obtained using the Peaceman *** findings reveal that the liquid injectivity in a SAG foam process is misestimated by conventional simulators based on the Peaceman *** lower the formation permeability,the greater the error.

关键词： Foam Enhanced oil recovery Surfactant-alternating-gas Injectivity Permeability

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Regulating crystal phase of TiO_(2) to enhance catalytic activity of Ni/TiO_(2) for solar-driven dry reforming of methane

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燃料化学学报（中英文） 2024年第9期52卷 1203-1213页

作者： HE Zhanjun gong kun DAI Yuanyuan NIU Qiang LIN Tiejun ZHONG Liangshu Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China National Enterprise Technology Center Inner Mongolia Erdos Electric Power and Metallurgy Group Co.LtdOrdos 016064China

Ni/TiO_(2) catalyst is widely employed for photo-driven DRM reaction while the influence of crystal structure of TiO_(2) remains *** this work,the rutile/anatase ratio in supports was successfully controlled by varying the calcination temperature of anatase-TiO_(2).Structural characterizations revealed that a distinct TiO_(x) coating on the Ni nanoparticles(NPs)was evident for Ni/TiO_(2)-700 catalyst due to strong metal-support *** is observed that the TiOx overlayer gradually disappeared as the ratio of rutile/anatase increased,thereby enhancing the exposure of Ni active *** exposed Ni sites enhanced visible light absorption and boosted the dissociation capability of CH4,which led to the much elevated catalytic activity for Ni/TiO_(2)-950 in which rutile ***,the catalytic activity of solar-driven DRM reaction was significantly influenced by the rutile/anatase ***/TiO_(2)-950,characterized by a predominant rutile phase,exhibited the highest DRM reactivity,with remarkable H_(2) and CO production rates reaching as high as 87.4 and 220.2 mmol/(g·h),*** rates were approximately 257 and 130 times higher,respectively,compared to those obtained on Ni/TiO_(2)-700 with *** study suggests that the optimization of crystal structure of TiO_(2) support can effectively enhance the performance of photothermal DRM reaction.

关键词： dry reforming of methane photothermal catalysis crystal phase TiO_(2) metal-support interaction

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弱纹理环境下融合点线特征的双目视觉同步定位与建图

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光学精密工程 2024年第5期32卷 752-763页

作者：龚坤徐鑫陈小庆许悦雷张兆祥西北工业大学无人系统技术研究院陕西西安710072 中国人民解放军军事科学院国防科技创新研究院北京100850

针对室内弱纹理环境下基于点特征的视觉同步定位与建图(Simultaneous Localization and Mapping,SLAM)存在的轨迹漂移等问题,提出了一种融合点线特征的双目视觉SLAM系统,并对线特征的提取与匹配问题展开研究。为了提高线特征的质量,通... 详细信息

针对室内弱纹理环境下基于点特征的视觉同步定位与建图(Simultaneous Localization and Mapping,SLAM)存在的轨迹漂移等问题,提出了一种融合点线特征的双目视觉SLAM系统,并对线特征的提取与匹配问题展开研究。为了提高线特征的质量,通过长度与梯度抑制、短线合并等方法,进一步改进LSD(Line Segment Detector)线特征提取方法。同时,通过将匹配问题转换为优化问题,并利用几何约束构建代价函数,提出了一种基于几何约束的快速线段三角化方法。实验结果表明,本文所提方法在多个数据集上的表现都优于基于描述子的传统方法,尤其在室内弱纹理场景下,其平均匹配精度达到91.67%,平均匹配时间仅需7.4 ms。基于此方法,双目视觉SLAM系统在弱纹理数据集上与已有算法ORBSLAM2,PL-SLAM的定位误差分别为1.24,7.49,3.67 m,定位精度优于现有算法。

关键词：双目视觉线特征提取视觉同步定位与建图特征匹配

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异常检测在网络安全防护中的应用研究

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邮电设计技术 2024年第8期 24-28页

作者：刘洋翟锐巩坤中国联通山东分公司山东济南250014

图像异常数据作为网络安全检测的核心监控对象,面临着样本不均衡、数据缺乏标注以及异常形式多样化等挑战,针对这些问题,创新性地提出了自信息量挖掘模块,旨在学习已知类别样本的数据模式;同时提出了三元组信息量学习策略,优化类别信息... 详细信息

图像异常数据作为网络安全检测的核心监控对象,面临着样本不均衡、数据缺乏标注以及异常形式多样化等挑战,针对这些问题,创新性地提出了自信息量挖掘模块,旨在学习已知类别样本的数据模式;同时提出了三元组信息量学习策略,优化类别信息学习和已知类别的数据模式学习,最终实现了在网络安全防护场景中对图像的未知类别样本的异常检测。实验结果表明,异常检测算法可以有效提升网络安全防护的准确性,在实际应用中表现出色。

关键词：深度学习异常检测网络安全数据模式

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Equitable Total Coloring of F_n ∨ W_n

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 83-86页

作者： kun gong Zhong-fu Zhang Jian-fang Wang Institute of Applied Mathematics Lanzhou Jiaotong University Lanzhou 730070 China Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of SciencesBejing 100190 China

The minimum number of total independent partition sets of V ∪ E of graph G（V,E） is called the total chromatic number of G denoted by χt（G）. If the difference of the numbers of any two total independent partition sets of V ∪ E is no more than one＇, then the minimum number of total independent partition sets of V ∪ E is called the equitable total chromatic number of G, denoted by χet（G）. In this paper, we obtain the equitable total chromatic number of the join graph of fan and wheel with the same order.

关键词： Fan wheel join graph equitable edge coloring equitable total coloring

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Cloning and Sequence Analysis of lef-3 Gene from Pieris rapae Granulovirus

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Agricultural Sciences in China 2010年第5期9卷 681-689页

作者： MENG Xiang-kun gong Cheng-liang XUE Ren-yu CAO Guang-li ZHU Yue-xiong Medical College of Soochow University Suzhou 215123 P.R.China

To better understand the origination and evolution of lef-3 gene from baculovirus genome and determine the relationships between various viruses at molecular level, late expression factor 3 gene （lef-3） fragments of Pieris rapae granulovirus were obtained through conventional PCR method and sequenced after cloned into T-vector. Then, bioinformatics analysis on lef-3 gene and its encoding sequences were conducted by using bid-softs. Four mutations were appeared in the ORF of cloned lef-3 gene, which did not alter the characteristics of amino acids. It was inferred that PiraGV LEF-3 protein contained 399 amino acids, the molecular weight of which was 3.99 kD. Prediction of the LEF-3 advanced structure and homology comparison between other LEF-3 from various baculoviruses showed that the lef-3 gene might encode the single-stranded DNA-binding protein. The result of BLAST revealed that the lef-3 gene only existed in Lepidoptera host for the baculovirus genome, and the evolution analysis illustrated that lef-3 gene could be divided into 3 groups including one granulovirus （GV） group and 2 nucleopolyhedrovirus （NPV） groups. The selection pressure analysis of GV lef-3 gene coding region showed that the majority of lef-3 genes performed negative selection, while the Ka/Ks differed from different lef-3 gene, to some extent, which also performed positive selection. The origination analysis revealed that lef-3 gene of baculovirus might derive from bacteria. The lef-3 gene of PiraGV was cloned successfully and the possible patterns of origination and evolution were speculated through bioinformatics analysis.

关键词： Pieris rapae granulovirus late expression factor 3 (LEF-3) single-stranded DNA-binding protein (SSB) evolutionary origin

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A MATHEMATICAL MODEL OF THE FLOW FROM THE OUTLET IN DAMS

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Journal of Hydrodynamics 2001年第1期13卷 17-22页

作者： Guo Ya-kun, Wu Chi-gong State Key Hydraulics Laboratory of High Speed Flows, Sichuan University, Chengdu 610065,China Sichuan Univ. Chengdu 610065 China

WT5”BZ]On the basis of the theory of complex functions the authors derive the boundary integral equations for the flow discharging from an outlet in a dam in an auxiliary plane. Assuming that the integral variables are constants in small integral intervals, one can directly integrate the boundary integral equations. With the use of the boundary stream coordinates, the boundary integral equations in the physical plane are obtained. Therefore the angle of the solid boundaries is a known function of stream coordinates in the physical plane instead of an unknown function in the complex potential plane or auxiliary plane. As a result we avoid the difficulty for seeking the mapping function which conformally maps the physical plane onto the complex potential or auxiliary plane. A synchronous iterative method for the flow rate and the flow pattern is presented. The flow rate, the pressure distributions at the solid walls and the profiles of the free jet are calculated. The numerical results are in excellent agreement with the experimental results.[WT5”HZ]

关键词： free jet flow from outlet in dam theory of complex function boundary integral equations numerical iteration

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A quasi-distributed dynamic and static strain sensor system

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Optoelectronics Letters 2008年第4期4卷 243-247页

作者： JING Wen-cai LIU Tao ZHANG Pei-song LIU kun JIA Da-gong ZHANG Yi-mo College of Precision Instrument ＆ Optoelectronics Engineering Key Laboratory for Optoelectronic Information and Technical Science of Ministry of Education Tianjin Universiey Tianjin 300072 China

A quasi-distributed dynamic and static strain sensor system consisting of 16 FBG sensors is designed by using an amplified-sponteneous emission （ASE） optical source, an optical tunable falter and a tunable laser. Aresolution of about 5 με has been achieved for dynamic strain measurement. The resolution for static strain measurement is about 1 με.

关键词：静应力传感器系统准分布式动力学光纤布拉格光栅光源

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