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Synthesis of porous iron hydroxy phosphate from phosphate residue and its application as a Fenton-like catalyst for dye degradation

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Journal of Environmental Sciences 2022年第2期34卷 307-319页

作者： Weilin Guo yin cao Yi Zhang Lijun Wang Lingxue Kong School of Environmental and Materials Engineering Shanghai Polytechnic UniversityShanghai 200240China Deakin University GeelongInstitutefor Frontier MaterialsVictoria 3216Australia Shanghai Innovation Institutefor Materials Shanghai 200444China

Phosphate residue is a kind of hazardous solid waste and if not properly disposed of, could cause serious environmental contaminations. The abundant iron salt available in phosphate residue can be used to prepare photo-Fenton catalytic reagent for wastewater treatment. In this study, the phosphate residue was effectively purified by a hydrothermal recrystallization method, reaching an iron phosphate purity of 94.2%. The particles of iron phosphate were further processed with ball milling with their average size reduced from 19.4 to 1.6 μm. By hydrothermal crystallization of iron phosphate and thermal decomposition of oxalate precursor, porous iron hydroxy phosphate was prepared. The modified porous iron hydroxy phosphate(m-PIHP) of higher surface area with iron oxalate on its surface can degrade 98.87% of Rhodamine B in 15 min. Cyclic experiment showed that the catalyst still had a good catalytic activity after six cycles( > 40%). The X-ray photoelectron spectroscopy results showed that the iron oxalate complex on the catalyst surface decomposed to produce ferrous ions and accelerated the rate of · OH production. The current work demonstrated that the m-PIHP synthesized from phosphate residue and modified with iron oxalate can be used as an effective dye wastewater treatment agent.

关键词： Phosphate residue Porous iron hydroxy phosphate Fenton-like ·OH

PARAMETRIC IDENTIFICATION AND SENSITIVITY ANALYSIS FOR AUTONOMOUS UNDERWATER VEHICLES IN DIVING PLANE

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Journal of Hydrodynamics 2012年第5期24卷 744-751页

作者： XU Feng ZOU Zao-jian yin Jian-chuan cao Jian School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240China School of Naval Architecture Ocean and Civil Engineering and State Key Laboratory of Ocean EngineeringShanghai Jiao Tong University Shanghai 200240 China College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

The inherent strongly nonlinear and coupling performance of the Autonomous Underwater Vehicles （AUV）, maneuvering motion in the diving plane determines its difficulty in parametric identification. The motion parameters in diving plane are obtained by executing the Zigzag-like motion based on a mathematical model of maneuvering motion. A separate identification method is put forward for parametric identification by investigating the motion equations. Support vector machine is proposed to estimate the hydrodynamic derivatives by analyzing the data of surge, heave and pitch motions. Compared with the standard coefficients, the identified parameters show the validation of the proposed identification method. Sensitivity analysis based on numerical simulation demonstrates that poor sensitive derivative gives bad estimation results. Finally the motion simulation is implemented based on the dominant sensitive derivatives to verify the reconstructed model.

关键词： parametric identification Autonomous Underwater Vehicles (AUVs) support vector machine sensitivity analysis

A study of beryllium moderator thickness for a fission chamber with fast neutron measurements

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Nuclear Science and Techniques 2017年第9期28卷 51-56页

作者： Wen-Di Wang Hong-Rui cao Jing cao Guo-Liang Yuan Ze-Jie yin State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026 China Department of Modern Physics University of Science andTechnology of China Hefei 230026 China Southwestern Institute of Physics Chengdu 610041 China

The detection efficiency of the fission chamber(FC) is very important for studying the neutron flux measurement(NFM) system in ITER. In this article, we mainly focus our attention on the influence of the moderator. With the Monte Carlo particle transport simulation tool named Geant4, we make a simulation of FC detection efficiency with different levels of thickness of a beryllium *** manufactured FCs for ITER-NFM systems are then used to test the parameters and performance. The test results agree well with our simulation.

关键词：中子测量慢化剂裂变室厚度 Geant4 铍测量系统模拟工具

The instability of a stable metal-organic framework in amino acid solutions

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Nano Research 2022年第7期15卷 6607-6612页

作者： Yiran Wang Jinglin yin Weicheng cao Yao Fu Xueqian Kong Department of Chemistry Zhejiang UniversityHangzhou 310027China Department of Rehabilitation Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310027China Key Laboratory of Excited-State Materials of Zhejiang Province Zhejiang UniversityHangzhou 310027China

Metal–organic frameworks(MOFs)are being investigated as the potential materials for future drug delivery and gene therapy systems thanks to their tunable functionality and ***,the structure of MOFs could be altered in a biological environment or in a buffer *** is of great importance to evaluate the stability of MOFs and understand the degradation processes for the sake of the biomedical *** this work,we investigate the stability of UiO-66,a generally-perceived stable MOF,in different amino acid *** find that UiO-66 loses crystallinity in relatively mild basic conditions(when pH≥9)in the presence of amino *** instability is more pronounced in the lysine and arginine solutions which have stronger *** can be attributed to the accelerated ligand exchange of UiO-66 under basic *** a combination of techniques,we show that the amino acids can replace the organic linkers and form zirconium-amino acid *** research reveals one possible mechanism of MOF degradation in biological environment,yet such degradability could be also an important designable property for MOFs in biomedical applications.

关键词： metal-organic frameworks stability amino acids solid-state nuclear magnetic resonance(NMR) biomedical applications

Recent Advances in Computational Photography

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Chinese Journal of Electronics 2019年第1期28卷 1-5页

作者： dai Qionghai WU Jiamin FAN Jingtao XU Feng cao Xun Department of Automation Tsinghua University Beijing Key Laboratory of Multi-dimension & Multi-scale Computational Photography (MMCP) Tsinghua University School of Software Tsinghua University School of Electronic Science and Engineering Nanjing University

Traditional photography focuses on the optimization of lenses for a perfect imaging ***, with the great developments of computational resources and optical modulation devices, we can achieve more powerful imaging abilities with concise *** photography is such an emerging interdisciplinary field by incorporating computational strategy in traditional imaging system to break the limitations in various dimensions such as spectrum, time and space. Recent advances in different aspects have aroused great interests and introduced tremendous applications in biology, material science and computer vision.

关键词： Computational photography Gigapixel imaging Super-resolution imaging Compressive sensing Hyperspectral imaging

Effect of Zr on undissolved phases and carbide precipitation in Ti microalloyed low-carbon steel

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Journal of Iron and Steel Research International 2019年第7期26卷 720-732页

作者： Peng-cheng Liu Jian-chun cao Shu-biao yin yin-hui Yang Peng Gao Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China

The undissolved phases and carbide precipitation in Ti and Ti-Zr microalloyed low-carbon steels were investigated by scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectrometry. At 1225℃, the replacement of Ti by Zr formed Zr2CS and (Zr, Ti)N (the Ti/Zr atomic ratio is 0.11) and reduced the consumption of Ti. At 925℃, it was identified that TiC phases were precipitated at first and Zr was incorporated into the TiC lattice in the subsequent precipitation process, which promoted the precipitation of titanium carbide. The calculation of the interaction coefficient between Ti, C, N and Zr showed that Zr reduced the activity of Ti and C and increased the activity of N in the iron matrix. Therefore, with the addition of Zr, the solubility of Ti was increased, and the consumption of Ti was reduced at high temperature in Ti microalloyed low-carbon steel. The thermodynamic calculation of carbide precipitation transformation showed that the replacement of Ti by Zr increased the nucleation driving force and the nucleation rate of titanium carbide, while the critical core size and the critical nuclear energy were reduced. As the holding time was extended, the Zr/ Ti atomic ratio increased and the size of the precipitates also increased. When the Zr/Ti atomic ratio reached a certain level, the size of the precipitates did not increase with further increase in atomic ratio. When the Zr/Ti atomic ratio in (Ti, Zr)C was 0.05-0.17,(Ti, Zr)C was the most stable carbide and the easiest to nucleate at 925℃. There was more of the (Ti, Zr)C phase than TiC at 925 ℃ after 50 and 100 s, and the time to complete the coarsening behavior of (Ti, Zr)C was shorter than that of TiC.

关键词： Ti-Zr microalloyed steel Undissolved phase Carbide precipitation Zirconium Thermodynamics

计吏、“贡士”与东汉贡献秩序的演变——以“举计吏”为线索

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古代文明（中英文） 2025年第1期19卷 94-105,M0006页

作者：曹天江中央民族大学历史文化学院北京100081

东汉时期流行起来的“举计吏”一语,将上计与察举相联系,为观察东汉上计事务与贡献秩序的关系及其意义提供了视点。细考史料所见郡国上计案例,可知上计与察举的前途相似,但当时并未将计吏设为正式的察举科目。与西汉相比,东汉上计对计... 详细信息

东汉时期流行起来的“举计吏”一语,将上计与察举相联系,为观察东汉上计事务与贡献秩序的关系及其意义提供了视点。细考史料所见郡国上计案例,可知上计与察举的前途相似,但当时并未将计吏设为正式的察举科目。与西汉相比,东汉上计对计吏的能力要求不再突出,计吏与长官的亲厚程度及其才学声望等成为更重要的因素,其人选也转向高级郡吏与布衣名士,并被赋予了地方“人才”的色彩。进而,郡国不再将上计之事推托给小吏,而是主动推荐计吏。加上察举诸生“与计偕”规定的长期执行及东汉贡献礼仪的日益完备,上计与察举在事务与观念上逐渐合流,最终,计吏被纳为“贡士”之选,统合贡献秩序中,彰显郡国对朝廷的属从关系,象征王朝国家对全国上下人、事、物全面的掌控。

关键词：上计贡士贡献秩序举计吏察举

Discrete Numerical Study on Type II Fracture of Partially Detached Concrete Panels in Cold Region

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Structural Durability & Health Monitoring 2025年第1期19卷 167-191页

作者： Huayi Zhang Maobin Song Lei Shen Nizar Faisal Alkayem Maosen cao College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210024China Haihe River Huaihe River and Xiaoqinghe River Basin Water Conservancy Management and Service Center of Shandong ProvinceJinan250100China College of Mechanics and Engineering Science Hohai UniversityNanjing211100China

When the upper chord beam of the beam-string structure(BSS)is made of concrete-ﬁlled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during con-struction,the inﬂuence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefﬁcient on the bending stiffness are analyzed parametrically by the numerical simula-tion technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction ***,the optimal construction plan of concrete placementﬁrst and then prestress-tensioning is proposed.

关键词： Beam-string structure(BSS) concrete-ﬁlled steel tube(CFST) bending stiffness timing of concrete placement prestress-tensioning

Identification of Contamination Information of Vegetation in Coal Mines Based on Hyperspectral Remote Sensing Data

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Journal of China University of Mining and Technology 2005年第3期15卷 213-217页

作者： ZHANG Jie-lin cao dai-yong Key Laboratory of Coal Resources Ministry of Education China Universi~. of Mining ＆ Technology Beijing 100083 China Beijing Research Institute of Uranium Geology Beijing 100029 China

The development and application of the hyper-spectral remote sensing (HRS) in the environment investiga-tion and evaluation of coal mines have been discussed in detail. By using Hyperion HRS technology and field spectrummeasuring and integrating traditional geological method as well as laboratory chemical measurement, the absorptionspectrum features and the spectral variation rules of vegetation caused by coal mine waste piles were studied. Based onthe spectral modeling methods and Vegetation Red Edge Parameter (VREP), the diagnose spectra information andspectral variation parameter were extracted, and the mapping methods of VREP were researched. The spatial distribu-tions of contaminative vegetation have been quickly found *** study has provided technical supports for the envi-ronment investigation and pollution management of coal mines.

关键词： Hyper-spectral remote sensing coal mines contamination information vegetation red edge parameter