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Characterization of Flame Retardancy and Oil-Water Separation Capacity of Superhydrophobic Silylated Melamine Sponges

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Fluid Dynamics & Materials Processing 2024年第2期20卷 383-400页

作者： Yongchun Liu Ni Qiao Yanli Yang Yanchun Li Chunxiao He Siyang Wang Chengcheng Liu Ruixia Lei Wang Li Wenwen Gao College of Chemistry and Chemical Engineering FLUOBON Pilot Base of Chemical EngineeringLongdong UniversityQingyang745000China Qingyang Solid and Hazardous Waste Pollution Prevention and Control Management Center Qingyang745000China Gansu Qingluyuan Environmental Monitoring Co. Ltd.Qingyang745000China School of Chemistry and Chemical Engineering Shanxi Key Laboratory of Low Metamorphic Coal Clean UtilizationYulin UniversityYulin719000China

A silylated melamine sponge(SMS)was prepared by two simple steps,namely,immersion and dehydration of a melamine sponge coated with methyltrichlorosilane.The silylated structure of SMS was characterized by FT-IR(Fourier-transform infrared)spectroscopy,SEM(Scanning electron microscopy)and in terms of water contact angles.Its oil-water absorption and separation capacities were measured by FT-IR and UV-visible spectrophoto-metry.The experimental results have shown that oligomeric silanol covalently bonds by Si-N onto the surface of melamine sponge skeletons.SMS has shown superhydrophobicity with a water contact angle exceeding 150°±1°,a better separation efﬁciency with regard to diesel oil(by 99.31%(wt/wt%)in oil-water mixture and even up to 99.99%(wt/wt%)for diesel oil in its saturated aqueous solution.Moreover,SMS inherited the intrinsicﬂame retardancy of the melamine sponge.In general,SMS has shown superhydrophobicity,high porosity,excellent selectivity,remarkable recyclability,and better absorption capacity for various oils and organic solvents,and a high separation efﬁciency for oil in saturated aqueous solutions.

关键词： Methyltrichlorosilane silylated melamine sponge(SMS) superhydrophobicity absorption capacity oil-water separable efﬁciency ﬂame retardancy

调控三芴酮基共价有机框架中的局域极化促进光催化析氢活性

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Science China Materials 2024年第2期67卷 504-513页

作者：郝磊沈荣晨秦朝超李能胡浩斌梁桂杰李鑫 Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China Henan Key Laboratory of Infrared Materials and Spectrum Measures and Applications School of PhysicsHenan Normal UniversityXinxiang 453007China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Key Laboratory of Efficient Utilization of Oil and Gas Resources in longdong College of Petroleum and Chemical EngineeringLongdong UniversityQingyang 745000China Hubei Key Lab Low Dimens Optoelect Mat&Devices Hubei University of Arts and ScienceXiangyang 441053China

局部电荷的强离域和强偶极矩是影响共价有机框架(COFs)基光催化剂催化析氢性能的两个关键因素.然而,基于精确的调控结构模型来系统研究这种构效关系的报告相对较少.本研究提出了一种新的策略,通过合理的设计,制备了三种三芴酮基COFs,通... 详细信息

局部电荷的强离域和强偶极矩是影响共价有机框架(COFs)基光催化剂催化析氢性能的两个关键因素.然而,基于精确的调控结构模型来系统研究这种构效关系的报告相对较少.本研究提出了一种新的策略,通过合理的设计,制备了三种三芴酮基COFs,通过在分子水平上调控单体的结构和偶极来提高局部电荷离域指数.我们重点研究这三种三芴酮基COF的局部电荷离域与光催化性能之间的构效关系.在不同三芴酮基COF中,1,3,5-三(对甲酰基苯基)苯基COF(TeTpb-COF)展现出21.6 mmol g^(-1)h^(-1)的最高析氢速率,与2,4,6-三(4-醛基苯基)-1,3,5-三嗪基COF(TeTt-COF,0.2mmol g^(-1)h^(-1))相比,光催化析氢性能提高了108倍.这种性能的增强可归因于其强大的分子内置电场提高了供体-受体嵌段单元中光生电荷的有效分离效率.这项工作证实了调整构建块可以极大增强三芴酮基COFs中的局部偶极矩,从而显著改善光催化析氢性能.构建模块的调控策略为创建高效的新型COF基光催化析氢平台提供了新机会.

关键词： covalent organic frameworks photocatalytic hydrogen evolution truxenone dipole moment local charge delocalization

Application Progress of Ultrasound Radiomics in the Evaluation and Prediction of Neoadjuvant Chemotherapy for Breast Cancer

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Proceedings of Anticancer Research 2024年第3期8卷 91-96页

作者： Jiaohan Zhou Huhu Chen The Second People’s Hospital of Qingyang Qingyang 745000Gansu ProvinceChina Medical College of longdong university Qingyang 745000Gansu ProvinceChina

Breast cancer is a malignant tumor with the highest incidence in women. In recent years, the incidence of breast cancer has shown an increasing trend, especially in younger patients, which seriously threatens the life and health of women. In order to improve the treatment effect of breast cancer, neoadjuvant chemotherapy has become a reliable strategy to cooperate with surgical treatment and improve the prognosis of advanced breast cancer, which is conducive to quickly and accurately curbing the growth of cancer cells, controlling the patients’ condition, reducing their pain, and improving the cure rate of breast cancer patients. This paper analyzes the development history of ultrasound radiomics, explores its application in the evaluation and prediction of neoadjuvant chemotherapy for breast cancer, and clarifies the research results of multimodal ultrasound radiomics in the analysis of high-order characteristics of breast cancer tumors and the evaluation of tumor heterogeneity, so as to provide references for the clinical treatment of breast cancer.

关键词： Ultrasound radiomics Breast cancer Neoadjuvant chemotherapy Ultrasonography

Effect of fracture fluid flowback on shale microfractures using CT scanning

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 426-436页

作者： Jiale He Zhihong Zhao Yiran Geng Yuping Chen Jianchun Guo Cong Lu Shouyi Wang Xueliang Han Jun Zhang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China Drilling Test Engineering Department of longdong Oil and Gas Development Company Changqing OilfieldPetroChina Company LimitedQingyang745000China Tight Oil and Gas Exploration and Development Project Department PetroChina Southwest Oil and Gas Field CompanyChengdu610056China No.11 Oil Production Plant Changqing Oilfield CompanyPetroChina Company LimitedQingyang745000China

The field data of shale fracturing demonstrate that the flowback performance of fracturing fluid is different from that of conventional reservoirs,where the flowback rate of shale fracturing fluid is lower than that of conventional reservoirs.At the early stage of flowback,there is no single-phase flow of the liquid phase in shale,but rather a gas-water two-phase flow,such that the single-phase flow model for tight oil and gas reservoirs is not applicable.In this study,pores and microfractures are extracted based on the experimental results of computed tomography(CT)scanning,and a spatial model of microfractures is established.Then,the influence of rough microfracture surfaces on the flow is corrected using the modified cubic law,which was modified by introducing the average deviation of the microfracture height as a roughness factor to consider the influence of microfracture surface roughness.The flow in the fracture network is simulated using the modified cubic law and the lattice Boltzmann method(LBM).The results obtained demonstrate that most of the fracturing fluid is retained in the shale microfractures,which explains the low fracturing fluid flowback rate in shale hydraulic fracturing.

关键词： Shale Flowback of fracturing fluid Microfracture Lattice Boltzmann method(LBM)

The research and progress of the enumeration of lattice paths

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Frontiers of Mathematics in China 2022年第5期17卷 747-766页

作者： Jishe FENG Xiaomeng WANG Xiaolu GAO Zhuo PAN School of Mathematics and Statistics Longdong UniversityQingyang 745000China School of Mathematics and Statistics Lanzhou UniversityLanzhou 730000China

The enumeration of lattice paths is an important counting model in enumerative combinatorics.Because it can provide powerful methods and technical support in the study of discrete structural objects in different disciplines,it has attracted much attention and is a hot research field.In this paper,we summarize two kinds of the lattice path counting models that are single lattice paths and family of nonintersecting lattice paths and their applications in terms of the change of dimensions,steps,constrained conditions,the positions of starting and end points,and so on.(1)The progress of classical lattice path such as Dyck lattice is introduced.(2)A method to study the enumeration of lattice paths problem by generating function is introduced.(3)Some methods of studying the enumeration of lattice paths problem by matrix are introduced.(4)The family of lattice paths problem and some counting methods are introduced.(5)Some applications of family of lattice paths in symmetric function theory are introduced,and a related open problem is proposed.

关键词： Enumeration of lattice paths generating function matrix family of lattice paths symmetric function

The effects of hydrogen on the helium behavior in palladium

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Nuclear Science and Techniques 2016年第5期27卷 114-119页

作者： Chang-Ning Peng Electrical Engineering College Longdong University

As one candidate of tritium storage materials,palladium subjects to the damage from helium atoms introduced by the(3-decay of tritium atoms.The mechanical properties of palladium will be greatly degraded deriving from the accumulation of helium atoms.A set of interatomic potentials has been fitted based on ab initio calculation according to the Morse formula.Molecular dynamic methods are utilized to investigate the existence of H atoms on the release of helium atoms from palladium with the present fitted potentials.It is found that hydrogen atoms play significant roles in the diffusion and release of helium atoms.The presence of hydrogen atoms tends to obstacle the diffusion and release of helium atoms in palladium.

关键词：氦原子氢原子行为钯分子动力学存储材料机械性能莫尔斯

Comparisons of thermogenic features in four coexisting songbirds:Is the northward colonized White-browed Laughingthrush different?

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Avian Research 2023年第1期14卷 78-85页

作者： Pengfei Liu Rongrong Jin Miaomiao Jiang Saiyue Zhang Yuehua Sun School of Life Sciences and Technology Longdong UniversityQingyang745000China Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of ScienceBeijing100101China

Thermogenic features are often invoked to illustrate animal’s colonization,distribution,and response to climate change.To understand why the White-browed Laughingthrush(Pterorhinus sannio)has expanded its distribution to temperate zones in recent years,we compared its thermogenic features with three species of songbirds that cooccur in its newly colonized areas.Thermogenic parameters of these four species were measured under different ambient temperatures,ranging from 0 to 40℃.The results showed that basal metabolic rate(BMR)was 44.5±3.9 mL O2/h in P.sannio,which is lower than predicted value by its body weight.This is also lower than the BMR of both its temperate congener the Plain Laughingthrush(P.davidi)and the montane,similar species Elliot’s Laughingthrush(Trochalopteron elliotii).The thermal neutral zone(TNZ)in P.sannio was 15-35℃,as compared to 10-27.5℃in P.davidi,25-30℃in T.elliotii,and 7.5-32.5℃in the Green-capped Greenfinch(Chloris sinica).Thermal conductance was lowest in P.sannio,with the minimum value lower than the predicted value based on its body weight.Our results showed that the northward-colonizing P.sannio exhibited different thermogenic characteristics compared with its coexisting species in the new habitat,even its congener P.davidi,which shared similar microhabitats to P.sannio.We suggest that researchers further explore the physiological mechanisms of birds’northward expansion.

关键词： Colonization Evaporative water los Thermal physiology Thermal neutral zone Temperature

Phosphorus-doped NiS_(2)electrocatalyst with a hybrid structure for hydrogen evolution

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Science China(Technological Sciences) 2022年第7期65卷 1506-1512页

作者： ZHOU Qi LIU HaoRui JIAO SunZhi FENG ChenChen State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China College of Mechanical Engineering Longdong UniversityQingyang 745000China

In this article,P-NiS_(2)/Ni_(x)P electrocatalysts were synthesized by dealloying the Ni-Al precursor followed by phosphosulfide treatment.We found that the hybrid structure of P-NiS_(2)/Ni_(x)P provides rich active sites for the surface hydrogen evolution reaction (HER),and the doping of P enhances the electronic conductivity of electrodes.In particular,the obtained electrode shows a low overpotential of 196 mV at 10 mA cm^(-2)and a small Tafel slope of only 110 mV dec^(-1)in the HER.Meanwhile,longterm constant current electrolysis test experiments indicate that P-NiS_(2)/Ni_(x)P has good service stability.This research will help to open a new window on the design and fabrication of HER electrocatalysts.

关键词： nickle phosphosulfides hybrid structure hydrogen evolution reaction dealloying

Spectrofluorimetric determination of trace amounts of cadmium with 2,4-dihydroxyacetophenone benzoylhydrazone

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Rare Metals 2006年第2期25卷 184-189页

作者： LIU Jianning ZHANG Bing WU Bowan LIU Yongchun YU Xinqiao Department of Chemistry Longdong University Qingyang 745000 China

A new fluorescent reagent 2,4-dihydroxyacetophenone benzoylhydrazone （DHAPBH） was synthesized and its ionization constants were established spectrophotometrically. The fluorescent reaction of this reagent with cadmium was studied. The cadmium ion can form a stable binary chelate with DHAPBH, having a mole ratio of 1 ：2 in the pH range of 3.6-4.4. Based on this chelation reaction, a highly sensitive spectrofiuorimetric method was developed for determination of trace amounts of cadmium in a water-ethanol （7：3 in volume ratio） medium at pH = 4.0. Under these conditions, the Cd-DHAPBH complex has excitation and emission maxima at 306 and 437 nm, respectively. The linear range of the method is from 0.36 to 140μtg·L^-1 and the detection limit is 0.27 μtg·L^-1 of cadmium. Interferences of other ions were studied. The method was successfully applied to the determination of cadmium in mineral water, tap water, fiver water, and wastewater.

关键词： cadmium 2,4-dihydroxyacetophenone benzoylhydrazone spectrofiuorimetry determination