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ZnWO_(4)-ZnIn_(2)S_(4) S-scheme heterojunction for enhanced photocatalytic H_(2) evolution

Journal of Materials Science & Technology 2022年第27期122卷 231-242页

作者： meng dai Zuoli He Peng Zhang Xin Li Shuguang Wang Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao266237China Suzhou Research Institute Shandong UniversitySuzhou 215123China State Center for International Cooperation on Designer Low-Carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Key Laboratory of Energy Plants Resource and Utilization Ministry of Agriculture and Rural AffairsSouth China Agricultural UniversityInstitute of Biomass EngineeringGuangzhou 510642China

The recombination of photogenerated electrons and holes is a crucial factor limiting photocatalytic H_(2)*** S-scheme ZnWO_(4)-ZnIn_(2)S_(4)heterojunction with 2D coupling interfaces was successfully synthesized using a simple solvothermal *** effective S-scheme interfacial charge migration route at the S-scheme heterogeneous interface was determined by energy band structure analyses(such as UPS,Mott-Schottky and XPS plots),which facilitates the separation of photoexcited *** is worth noting that the optimal ZnWO_(4)-ZnIn_(2)S_(4)composite has an H_(2)evolution activity of 4925.3μmol g^(-1)h^(-1)with favourable photostability and ***,the ZnWO_(4)-Zn In_(2)S_(4)heterojunction exhibits the maximum optical response value(2.8 m A cm-2)in the initial stage,effectively promoting the separation and migration of photogenerated *** establishment of the built-in electric field direction at the interface can effectively promote the space charge separation between the ZnWO_(4)and ZnIn_(2)S_(4)nanosheets,which is favorable to the photocatalytic H_(2)*** work provides valuable guidance for designing S-scheme heterojunction photocatalysts composed of two n-type semiconductors for energy and environmental *** recombination of photogenerated electrons and holes is a crucial factor limiting photocatalytic H_(2)*** S-scheme ZnWO_(4)-ZnIn_(2)S_(4)heterojunction with 2D coupling interfaces was successfully synthesized using a simple solvothermal *** effective S-scheme interfacial charge migration route at the S-scheme heterogeneous interface was determined by energy band structure analyses(such as UPS,Mott-Schottky and XPS plots),which facilitates the separation of photoexcited *** is worth noting that the optimal ZnWO_(4)-ZnIn_(2)S_(4)composite has an H_(2)evolution activity of 4925.3μmol g^(-1)h^(-1)with favourable photostability and ***,the ZnWO_(4)-ZnIn_(2)S_(4)heterojunc

关键词： Photocatalysts H_(2)evolution S-scheme heterojunction Internal electric field ZnWO_(4)-ZnIn_(2)S_(4)nanosheets

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Low-temperature Denitration Mechanism of NH_(3)-SCR over Fe/AC Catalyst

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 475-484页

作者：杨征宇黄帮福 ZHANG Guifang dai meng WEN Zhenjing LI Wanjun Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China Clean Metallurgy Key Laboratory of Complex Iron Resources University of Yunnan ProvinceKunming650093China

To study the modification mechanism of activated carbon(AC)by Fe and the low-temperature NH_(3)-selective catalytic reduction(SCR)denitration mechanism of Fe/AC catalysts,Fe/AC catalysts were prepared using coconut shell AC activated by nitric acid as the support and iron oxide as the active *** crystal structure,surface morphology,pore structure,functional groups and valence states of the active components of Fe/AC catalysts were characterised by X-ray diffraction,scanning electron microscopy,nitrogen adsorption and desorption,Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy,*** effect of Fe loading and calcination temperature on the low-temperature denitration of NH_(3)-SCR over Fe/AC catalysts was studied using NH_(3)as the reducing gas at low temperature(150℃).The results show that the iron oxide on the Fe/AC catalyst is spherical and uniformly dispersed on the surface of AC,thereby improving the crystallisation performance and increasing the number of active sites and specific surface area on AC in contact with the reaction ***,a rapid NH_(3)-SCR reaction was *** the roasting temperature remains constant,the iron oxide crystals formed by increasing the amount of loading can enter the AC pore structure and accumulate to form more *** the roasting temperature is raised from 400 to 500℃,the iron oxide is mainly transformed fromα-Fe_(2)O_(3)toγ-Fe_(2)O_(3),which improves the iron oxide dispersion and increases its denitration active site,allowing gas *** the Fe loading amount is 10%,and the roasting temperature is 500℃,the NO removal rate of the Fe/AC catalyst can reach 95%.According to the study,the low-temperature NH_(3)-SCR mechanism of Fe/AC catalyst is proposed,in which the redox reaction between Fe~(2+)and Fe~(3+)will facilitate the formation of reactive oxygen vacancies,which increases the amount of oxygen adsorption on the surface,especially the increase in surface ac

关键词： nitric acid activation method coconut shell activated carbon Fe/AC catalyst NH_(3)-SCR low-temperature denitrification mechanism

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Assembling S-scheme heterojunction between basic bismuth nitrate and bismuth tungstate with promoting charges’separation for accelerated photocatalytic sulfamethazine degradation

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Journal of Materials Science & Technology 2024年第4期171卷 185-197页

作者： Wenhan Chen meng dai Li Xiang Shan Zhao Shuguang Wang Zuoli He Shandong Key Laboratory of Water Pollution Control and Resource Reuse Shandong Key Laboratory of Environmental Processes and HealthSchool of Environmental Science and EngineeringShandong UniversityQingdao 266237China CEDAR Knight Cancer InstituteSchool of MedicineOregon Health and Science UniversityPortlandOR 97201United States Weihai Research Institute of Industrial Technology of Shandong University Shandong UniversityWeihai 264209China

The S-scheme heterojunction has garnered increasing attention due to its remarkable oxidation capacity and efficient separation of photogenerated *** this study,a one-pot glycerol-assisted hydrothermal process was utilized to successfully synthesize S-scheme heterojunction photocatalysts comprising basic bismuth nitrate(BBN)and bismuth tungstate(BWO).Interestingly,the BBN/BWO heterogeneous photo-catalysts exhibited the highest photocatalytic *** optimized product achieved the degradation of sulfamethazine(SMZ)within 1 h,with a kinetic constant(k)value of 0.05818 min^(−1).The degradation process was influenced significantly by·O^(2)−and h^(+)*** determine the degradation pathway of SMZ in the presence of BBN/BWO-0.6,liquid chromatography-mass spectrometry(LC-MS)analysis was performed,which revealed a decrease in the toxicity of intermediates and *** enhanced pho-tocatalytic activity can be attributed to the internal electric field(IEF)of the S-scheme heterojunction between BBN and BWO,effectively promoting the separation of photogenerated *** research presents a viable approach for developing S-scheme heterojunctions in SMZ photodegradation and other environmental applications.

关键词： Photocatalysis S-scheme Heterojunction Bi_(2)WO_(6) Sulfamethazine

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Diffusion tensor imaging of spinal microstructure in healthy adults： improved resolution with the readout segmentation of long variable echo-trains

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Neural Regeneration Research 2017年第12期12卷 2067-2070页

作者： Bu-tian Zhang meng Li Li-li Yu Yi-meng dai Shao-nan Yu Jin-lan Jiang China-Japan Union Hospital of Jilin University Changchun Jilin Province China

Diffusion tensor imaging plays an important role in the accurate diagnosis and prognosis of spinal cord diseases. However, because of technical limitations, the imaging sequences used in this technique cannot reveal the fine structure of the spinal cord with precision. We used the readout segmentation of long variable echo-trains（RESOLVE） sequence in this cross-sectional study of 45 healthy volunteers aged 20 to 63 years. We found that the RESOLVE sequence significantly increased the resolution of the diffusion images and improved the median signal-to-noise ratio of the middle（C4–6） and lower（C7–T1） cervical segments to the level of the upper cervical segment. In addition, the values of fractional anisotropy and radial diffusivity were significantly higher in white matter than in gray matter. Our study verified that the RESOLVE sequence could improve resolution of diffusion tensor imaging in clinical applications and provide accurate baseline data for the diagnosis and treatment of cervical spinal cord diseases.

关键词： nerve regeneration diffusion tensor imaging cervical spinal cord microstructure gray matter white matter readout segmentationof long variable echo-train sequence signal-to-noise ratio fractional anisotropy neural regeneration

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Recent advances in diagnosis and treatment of gastroenteropancreatic neuroendocrine neoplasms

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World Journal of Gastrointestinal Surgery 2022年第5期14卷 383-396页

作者： meng dai Christina S Mullins Lili Lu Guido Alsfasser Michael Linnebacher Clinic of General Surgery Molecular Oncology and ImmunotherapyRostock University Medical Center18057 RostockGermany Clinic of General Surgery Rostock University Medical Center18057 RostockGermany

Gastroenteropancreatic neuroendocrine neoplasms(GEP-NENs)are a rare group of tumors originating from neuroendocrine cells of the digestive *** incidence has increased over the last *** specific pathogenetic mechanisms underlying GEP-NEN development have not been completely *** GEP-NENs are usually asymptomatic;some grow slowly and thus impede early diagnosis,which ultimately results in a high rate of ***,many GEP-NEN patients present with later staged *** hereby,research attention for diagnosis and treatment for GEP-NENs increased in recent *** result of which is great progress in clinical diagnosis and *** to the most recent clinical guidelines,improved grading standards can accurately define poorly differentiated grade 3 neuroendocrine tumors and neuroendocrine carcinomas(NECs),which are subclassified into large and small cell *** different functional imaging methods facilitates precise *** expression of somatostatin receptors helps to predict *** analyses of mutations affecting death domain associated protein(DAXX),multiple endocrine neoplasia type 1(MEN 1),alpha thalassemia/intellectual disability syndrome X-linked(ATRX),retinoblastoma transcriptional corepressor 1(RB 1),and mothers against decapentaplegic homolog 4(SMAD 4)help distinguishing grade 3 NENs from poorly differentiated *** aim of this review is to summarize the latest research progress on diagnosis and treatment of GEP-NENs.

关键词： GEP-NENs Functional imaging Peptide receptor radionuclide therapy Targeting agents Immune checkpoint inhibitors Genetic mutations

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基于协同优化策略和人工蜂群算法的轨道电路邻线干扰防护研究

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中国铁道科学 2024年第1期45卷 178-189页

作者：代萌中国铁路济南局集团有限公司济南电务段山东济南250001

高速铁路车站运营场景复杂,易引发轨道电路邻线干扰,造成信号误解码和误显示,影响列车安全高效运行。基于空间耦合和传导耦合原理,根据高速铁路轨道电路特点和结构,分别建立传输线路阻抗平衡和不平衡条件下的复杂场景邻线干扰计算模型;... 详细信息

高速铁路车站运营场景复杂,易引发轨道电路邻线干扰,造成信号误解码和误显示,影响列车安全高效运行。基于空间耦合和传导耦合原理,根据高速铁路轨道电路特点和结构,分别建立传输线路阻抗平衡和不平衡条件下的复杂场景邻线干扰计算模型;考虑机车动态运行条件,完成最不利情况下邻线干扰量值的定量计算,并利用ANSYS平台完成计算结果的有限元仿真验证;针对邻线干扰还受到发送电平等级、补偿电容数量和容值、线路并行长度、道床电阻、分路电阻、线路间距等参数叠加和相互制约的影响,采用人工蜂群(Artificial Bee Colony,ABC)智能算法,提出基于多参数协同优化策略的邻线干扰防护对策,给出各参数相应最优取值及其对信干比(Signal-to-Interference Ratio,SIR)影响重要度。结果表明:邻线干扰量值超过车载机车信号灵敏度将导致解码错误;应用提出的防护对策对现场邻线干扰工程案例中线路并行长度和发送电平等参数进行优化,SIR可提升14.6 dB。研究结论可用于高速铁路轨道电路配置及优化实践,为防护邻线干扰提供工程参考和分析验证。

关键词：高速铁路轨道电路邻线干扰人工蜂群算法干扰防护协同优化

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Study on Reaction Types and Environment in Different Regions of Diesel Deep Hydrodesulfurization Reactor

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China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 10-20页

作者： dai meng Li Shicai Li Yang Xu Dahai Ding He Chen Guang Guo Rong SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Dalian 116045

In this work,the influence of reaction conditions on hydrocarbon distribution and product quality was tested to obtain the rule of variation with different residence time.A semi-experience and semi-mechanism dynamics model was established and *** on the simulation results,the hydrogenation reactor is divided into five regions:the upper two regions are mainly saturated with most of tri-cyclic and bi-cyclic aromatics,and 90%of nitrides are converted,while all simple sulfide and some 4,6-DMDBT compounds undergo transformation *** the lower three regions,the reaction rate of HDS and HDN slows down,while the rate of monocyclic aromatic saturation *** HDS,HDN and HDA rates of the optimized catalyst grading scheme are significantly increased.

关键词： diesel HDS reactor reaction type kinetic model simulation

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Pancreatic cancer with ovarian metastases: A case report and review of the literature

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World Journal of Clinical Cases 2020年第21期8卷 5380-5388页

作者： Shun-Da Wang Liang Zhu Huan-Wen Wu meng-Hua dai Yu-Pei Zhao Department of General Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Radiology Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Pathology Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China

BACKGROUND Pancreatic cancer with ovarian metastases is rare and easily *** patients are first diagnosed with ovarian *** report a rare case of ovarian metastases secondary to pancreatic *** also review the literature to analyze the clinical characteristics of,diagnostic methods for,and perioperative management strategies for this rare *** SUMMARY A 48-year-old woman with an abdominal mass presented to our *** tomography revealed lesions in the pancreas and lower *** examination and histological investigation of biopsy specimens revealed either an ovarian metastasis from a pancreatic neoplasm or two primary tumors,with metastasis strongly *** patient simultaneously underwent distal pancreatectomy plus splenectomy by a general surgeon and salpingo-oophorectomy with hysterectomy by a *** examination of the surgical specimen revealed a pancreatic adenocarcinoma(intermediate differentiation,mucinous)and a metastatic mucinous adenocarcinoma in the *** For this rare tumor,surgical resection is the most effective treatment,and the final diagnosis depends on tumor pathology.

关键词： Pancreas Ovary Pancreatic cancer Ovarian cancer Metastasis Case report

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Damage of reservoir rock induced by CO_(2) injection

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Petroleum Science 2022年第4期19卷 1674-1681页

作者： Jing Li Zhao-Yang Chen Yong-Cun Feng Li-Sha Qu Jia-Geng Liu Wen-Yan Li meng-Ying dai College of Pipeline and Civil Engineering China University of PetroleumQingdao266580ShandongChina College of Petroleum Engineering China University of PetroleumBeijing102249China School of Geosciences China University of PetroleumQingdao266580ShandongChina Research Institute of Exploration and Development PetroChina Tarim Oilfield CompanyKorla841000XinjiangChina

The study of reservoir rock damage induced by gas injection is of great significance to the design of reservoir stimulation and the improvement of oil and gas recovery. Based on an example horizontal well in the Hudson Oilfield of the Tarim Basin and considering the multi-physics coupling effects among highpressure fluid, rock deformation, and damage propagation during CO_(2) injection, a three-dimensional finite element model for CO_(2) injection in deep reservoir considering seepage-stress-damage coupling was developed. The evolution of reservoir rock damage under different CO_(2) injection conditions was systematically investigated. The results show that tensile damage and shear damage are concentrated in the vertical direction and the horizontal maximum compressive principal stress direction, respectively,and the tensile damage is the main damage mode. At higher CO_(2) injection rate and pressure, the damaged areas near the wellbore are mainly distributed in the direction of the maximum compressive principal stress, and the development of the damaged area near the wellbore will be inhibited by the formation and evolution of far-field damage. CO_(2) injection aggravates the extension of tensile damage,but inhibits the initiation of shear damage, and eventually leads to the gradual transition from shear damage to tensile damage. Under the same injection conditions, CO_(2) injection has superior performance in creating rock damage compared with the injection of nitrogen and water. The results in this study provide guidance for enhanced oil recovery in deep oil and gas reservoirs with CO_(2) injection.

关键词： CO_(2)injection Seepage-stress-damage coupling Rock damage Numerical simulation

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Melt extraction and mineralization: A case study from the Shuangjianzishan supergiant Ag-Pb-Zn deposit(208 Mt), Inner Mongolia, NE China

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China Geology 2023年第4期6卷 623-645,I0001-I0003页

作者： meng dai Guang-sheng Yan Yong-sheng Li Wen-bin Jia Fan-yu Qi Xing Ju China Aero Geophysical and Remote Sensing Center for Natural Resources China Geology SurveyMinistry of Natural ResourcesBeijing 100083China Chinese Academy of Geological Sciences China Geology SurveyMinistry of Natural ResourcesBeijing 100037China Development and Research Center China Geology SurveyMinistry of Natural ResourcesBeijing 100037China

The supergiant Shuangjianzishan(SJZ) Ag-Pb-Zn deposit is in the southern segment of the Great Hinggan Range(SGHR), northeast China. Previous studies suggest the ore-forming material and fluid originated from the magmatic system, and the mineralization age was consistent with the diagenetic age. However,the relationship between granitic magmatism and mineralization is still unclear in the SJZ. In this study, CH-O-He-Ar and in-situ S-Pb isotope analyses were conducted to determine the sources of ore-forming fluids and metals, which were combined with geochemistry data of SJZ granitoids from previous studies to constrain the relationship between the magmatism and the mineralization. The C-H-O-He-Ar-S-Pb isotopic compositions suggested the SJZ ore-forming material and fluids were derived from a magmatic source, which has mixed a small amount of mantle-derived materials. In addition, the disseminated sulfide from the syenogranite has comparable S-Pb isotopic composition with the sulfide minerals from ore veins,suggesting that the generation of the SJZ ore-forming fluids has a close relationship with the syenogranite magmatism. Combining with the geochemical characters of the syenogranite, the authors proposed that the mantle-derived fingerprint of the SJZ ore-forming fluid might be caused by the parent magma of the syenogranite, which was derived from partial melting of the juvenile lower crust, and underwent the residual melts segregated from a crystal mush in the shallow magma reservoir. The extraction of the syenogranite parent magma further concentrated the fertilized fluids, which was crucial to mineralization of the SJZ Ag-Pb-Zn deposit.

关键词： Ag-Pb-Zn deposit D-O-C-He-Ar isotope In-situ S and Pb isotope analysis Melt extraction Ore-forming fluid Syenogranite Metallogenic belt Mineral exploration engineering Southern Great Hinggan Range

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