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System Analysis on Supercritical CO_2 Power Cycle with Circulating Fluidized Bed Oxy-Coal Combustion

Journal of Thermal Science 2019年第3期28卷 505-518页

作者： SHI Yan ZHONG Wenqi shao Yingjuan XIANG jun Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology

Supercritical carbon dioxide(S-CO_2) Brayton power cycle is a competitive technology to achieve high efficiency in a variety of applications. However, in coal power applications, the CO_2 generated from coal combustion still discharges into the atmosphere causing a series of environment problems. In this work, an 300 MWe S-CO_2 power cycle with circulating fluidized bed(CFB) oxy-coal combustion was established including air separation unit(ASU), CFB boiler, recuperator system and carbon dioxide compression and purification unit(CPU). Based on the material and energy conservation, the cycle efficiency of S-CO_2(620°C, 25 MPa) Brayton power cycle with CFB oxy-coal combustion is evaluated compared to the oxy-coal combustion steam Rankine cycle and S-CO_2 Brayton power cycle with the 31.65 kg/s coal supply. After that, the influence of several factors, e.g., exhaust flue gas temperature, split ratio in recuperator system and the oxygen supply on the cycle efficiency was investigated and analyzed. The results show that the net efficiency of S-CO_2 power cycle with CFB oxy-coal combustion(32.67%) is much higher than the steam Rankine cycle utilizing CFB with 17.5 Mpa, 540°C steam(27.3%), and 25 Mpa, 620°C steam(30.15%) under the same exhaust flue gas temperature. In addition, lower exhaust flue gas temperature and higher split ratio are preferred to achieve higher cycle efficiency. Lower oxygen supply can reduce the energy consumption of ASU and CPU, further increasing the system net efficiency. However, the energy losses of ASU and CPU are still very large in oxy-coal combustion and need to be improved in further work.

关键词： S-CO2 oxy-coal combustion CO2 capture CFB boiler process simulation

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Oral delivery of ferroptosis inducers for effective treatment of hepatic fibrosis

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Nano Research 2024年第8期17卷 7621-7630页

作者： Yinglan Yu Shunlong Zhang Yongfeng Xu Hao shao Lei luo College of Pharmaceutical Sciences Southwest UniversityChongqing 400715China

Liver fibrosis is characterized by the excessive accumulation of extracellular matrix(ECM),which is primarily produced by activated hepatic stellate cells(HSCs).However,effective therapies for hepatic fibrosis are currently *** is a promising anti-fibrotic drug candidate,but its clinical application is hindered by limited ***,we present a novel oral delivery platform that enhances the HSCs uptake of artesunate and induces potent *** platform is vitamin Adecorated nanoparticles encapsulated with *** multifunctional ligand vitamin A interacts with retinol-binding proteins that are highly expressed on the intestinal epithelium to promote transcytosis,highly expressed on the surface of HSCs but lowly expressed in normal *** oral administration,this oral delivery platform enhances transepithelial transport in the intestine,improves drug accumulation in the liver,and continuously increases HSCs uptake of *** drug release in HSCs,artesunate depletes glutathione peroxidase 4 and glutathione,effectively initiating *** vivo experiments demonstrate that this strategy induces pronounced ferroptosis,efficiently relieving liver *** work provides a proof-ofconcept demonstration that an oral delivery strategy for ferroptosis inducers may be beneficial for liver fibrosis treatment.

关键词： liver fibrosis hepatic stellate cells oral delivery intestinal epithelium ferroptosis

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Humification characterization of biochar and its potential as a composting amendment

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Journal of Environmental Sciences 2014年第2期26卷 390-397页

作者： Jining Zhang Fan L Chenghao luo Liming shao Pinjing He Institute of Waste Treatment & Reclamation State Key Laboratory of Pollution Control & Resource Reuse Tongji University

Biochar has received increasing attention due to its applications as a soil amendment. Here, the chemical properties of solid and water-extractable fractions of four biochar samples were investigated. The results showed that wood biochar and bamboo biochar samples were 60%-80% more hydrophobic than those of rice husk biochar and rice husk ash. In addition, the acidity was 3.88 mmol/g from the total functional groups and 1.03 mmol/g from the carboxyl groups/lactones/phenols found in the wood biochar sample, which were about 1.5 times greater than those of the bamboo biochar sample. These functional groups could be used to determine the sorptive capacity of biochar for ionic solutes and water content and to increase the degradation of compost organics. The wood biochar sample was found to have the most humification materials （fulvic acid-like material ＋ humic acid-like material） in the water-extractable fraction, which was 3-10 times higher than that in the rice husk biochar and rice husk ash; humified materials were not detected in the bamboo biochar sample. Humification materials in biochar may be involved in increasing the proportion of humic acid-like materials in humic-like substances within the compost product. Wood biochar had better hydrophobic, sorptive, aromatic, and humification properties compared to other biochars, suggesting that it may be used in composting in order to exert its effect as both a bulking agent and a composting amendment during the solid waste composting process.

关键词： biochar composting dissolved organic matter humification organic waste water-extraction

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Noise Reduction of an Axial Piston Pump by Valve Plate Optimization

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Chinese Journal of Mechanical Engineering 2018年第3期31卷 85-100页

作者： shao-Gan Ye jun-Hui Zhang Bing Xu State Key Laboratory of Fluid Power and Mechatronics Systems Zhejiang University Ocean College Zhejiang University

Current researches mainly focus on the investigations of the valve plate utilizing pressure relief grooves. However,air?release and cavitation can occur near the grooves. The valve plate utilizing damping holes show excellent perfor?mance in avoiding air?release and cavitation. This study aims to reduce the noise emitted from an axial piston pump using a novel valve plate utilizing damping holes. A dynamic pump model is developed,in which the fluid properties are carefully modeled to capture the phenomena of air release and cavitation. The causes of di erent noise sources are investigated using the model. A comprehensive parametric analysis is conducted to enhance the understanding of the e ects of the valve plate parameters on the noise sources. A multi?objective genetic algorithm optimization method is proposed to optimize the parameters of valve plate. The amplitudes of the swash plate moment and flow rates in the inlet and outlet ports are defined as the objective functions. The pressure overshoot and undershoot in the piston chamber are limited by properly constraining the highest and lowest pressure values. A comparison of the various noise sources between the original and optimized designs over a wide range of pressure levels shows that the noise sources are reduced at high pressures. The results of the sound pressure level measurements show that the optimized valve plate reduces the noise level by 1.6 d B(A) at the rated working condition. The proposed method is e ective in reducing the noise of axial piston pumps and contributes to the development of quieter axial piston machines.

关键词： Axial piston pump Noise reduction Fluid?borne noise Structure?borne noise Parametric analysis Multi?objective optimization

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SYNTHESIS OF CROSS-CONJUGATED(p-PHENYLENE)S-POLY(p-PHENYLENEVINYLENE)S HYBRIDS WITH LOW CONTENT OF STRUCTURAL DEFECTS

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Chinese Journal of Polymer Science 2007年第2期25卷 171-179页

作者： Shi-jun Zheng Qun Xu shao-kui Cao College of the Material Science and Engineertng Zhengzhou University Zhengzhou 450052 China

The novel shish-kebab-type liquid crystalline cross-conjugated （p-phenylene）s-poly（p-phenylenevinylene）s hybrid was synthesized through Gilch polymerization. Their structures and properties were characterized by NMR, GPC, DSC, X-ray diffraction and polarizing optical microscope （POM）. ^1H-NMR investigation of the polymers indicates that the shish-kebab-structure has a strong ability to suppress the structural defects in the polymers. The polymers are enantiotropic liquid crystals. The melting point （Tm） of the polymers decreases when the length of the alkoxy tails of the mesogenic units increases. The mesophase was identified by X-ray diffraction method. They showed not only a smectic LC phase, but also a strong green fluorescence in chloroform. The maximum absorption band of the ＂kebabs＂ of the two, 5-bis（4＇- alkoxyphenyl）benzene at 280 nm did not appear in absorption spectra of the polymers. The same phenomena were also observed in the fluorescence spectra. These results imply that the polymers have formed a cross-conjugated uniform structure and achieved an extended n-conjugation polymer.

关键词： Gilch polymerization Conjugated polymer Liquid crystal Shish-kebab Fluorescence.

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A new building block with intramolecular D-A character for conjugated polymers: ladder structure based on B←N unit

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Science China Chemistry 2019年第10期62卷 1387-1392页

作者： Xingxin shao Chuandong Dou jun Liu Lixiang Wang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China School of Applied Chemistry and EngineeringHefei 230026China

The general strategy to construct D-A type conjugated polymers is alternating copolymerization of electron-donating(D)monomer and electron-accepting(A)*** this article,we report a new strategy to develop D-A type conjugated polymers,*** fuse the D and A units into a polycyclic structure to produce a building block and then polymerize the building block with another *** develop a new building block with ladder structure based on B←N unit,B←N bridged dipyridylbenzene(BNDPB).In the skeleton of BNDPB,one diamine-substituted phenylene ring(D unit)and two B←N-linked pyridyl rings(A unit)are fused together to produce the polycyclic *** to the presence of intramolecular D-A character,the building block itself exhibits narrow bandgap of 1.74 *** conjugated polymers based on BNDPB show unique electronic structures,*** HOMOs and delocalized LUMOs,which are rarely observed for conventional D-A conjugated *** polymers exhibit smaller bandgap than that of the building block BNDPB and display near-infrared(NIR)light absorption(λabs=ca.700 nm).This study thus provides not only a new strategy to design D-A conjugated polymers but also a new kind of building block with narrow bandgap.

关键词： D-A character conjugated polymers building block ladder structure B-N unit

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MLE with datasets from populations having shared parameters

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Statistical Theory and Related Fields 2023年第3期7卷 213-222页

作者： jun shao Xinyan Wang School of Statistics East China Normal UniversityShanghaiPeople’s Republic of China Department of Statistics University of WisconsinMadisonWIUSA

We consider maximum likelihood estimation with two or more datasets sampled from differ-ent populations with shared *** more datasets with shared parameters can increase statistical accuracy,this paper shows how to handle heterogeneity among different populations for correctness of estimation and *** distributions of maximum likelihood estimators are derived under either regulan cases where regularityconditions are satis-fled or some non-regular situations.A bootstrap variance estimator for assessing performance of estimators and/or making large sample inferenceis also introduced and evaluated ina simulation study.

关键词： Accuracy asymptotic relativeefficiency bootstrap population heterogeneity regularity conditions

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Basic Characteristics of a New Flexible Pneumatic Bending Joint

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Chinese Journal of Mechanical Engineering 2014年第6期27卷 1143-1149页

作者： shao Tiefeng ZHANG Libin BAO Guanjun luo Xinyuan YANG Qinghua Key Laboratory of E&M Ministry of Education & Zhejiang Province Zhejiang University of Technology Engineering Training Center China Jiliang University

Several typical flexible pneumatic actuators （FPA） and different mechanical models describing their behaviors have been proposed, however, it is difficult to balance compliance and load capacity in conventional designs, and these models still have limitations in predicting behavior of FPAs. A new flexible pneumatic bending joint （FPBJ） with special anisotropic rigidity structure is proposed. The FPBJ is developed as an improvement with regard to existing types of FPA, and its principal characteristic is derived from the special anisotropic rigidity structure. With this structure, the load capacity in the direction perpendicular to bending plane is strengthened. The structure of the new FPBJ is explained and a mathematical model is derived based on Euler-Bernoulli beam model and Hook’s law. To obtain optimum design and usage, some key structure parameters and input-output characteristics are simulated. The simulation results reveal that the relationship between the structure parameters and FPBJ’s bending angle is nonlinear. At last, according to the simulation results, the FPBJ is manufactured with optional parameters and tested. The experimental results show that the joint’s statics characteristics are reflected by the mathematical model accurately when the FPBJ is deflated. The maximum relative error between simulation and experimental results is less than 6%. However, the model still has limitations. When the joint is inflated, the maximum relative error reaches 20%. This paper proposes a new flexible pneumatic bending joint which has sufficient load capacity and compliance, and the mathematical model provides theoretical guidance for the FPBJ’s structure design.

关键词： flexible pneumatic bending joint Euler-Bernoulli model Hook's law mathematical model

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DNS analysis of incipient drop impact dynamics using an accurate level set method

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Chinese Journal of Chemical Engineering 2017年第1期25卷 1-10页

作者： Min Chai Kun luo Changxiao shao Song Chen Jianren Fan State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

A series of 2D direct numerical simulations were performed with an accurate level set method for single drop *** adopted ACLS method was validated to be efficient with perfect mass conservation in both normal and oblique impacts.A square-root correction for neck bases was modified in accuracy as well as scope of *** addition,process of jet formation and evolution was studied to reveal internal dynamics in drop ***'s found that pressure gradient and vortex are coexisting and completive reasons for jet topology while the inclined angle has a significant effect on *** of jet formation and evolution are different in the front and back *** the help of PDF distribution and correction calculation,a compromise in the competition is *** work lays a solid foundation for further studies of dynamics in gas-liquid flows.

关键词： Numerical simulation Accurate level set Gas-liquid flow Interface Mechanism completion Compromise

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A Simple Proof of ACC for Minimal Log Discrepancies for Surfaces

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Acta Mathematica Sinica,English Series 2024年第2期40卷 425-434页

作者： Jing jun HAN Yu Jie luo Shanghai Center for Mathematical Sciences Fudan UniversityJiangwan CampusShanghai 200438P.R.China Department of Mathematics Johns Hopkins UniversityBaltimoreMD 21218USA

Following Shokurov's idea,we give a simple proof of the ACC conjecture for minimal log discrepancies for surfaces.

关键词： Ascending chain condition minimal log discrepancies minimal model program surface

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