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Determination of benzo[a]pyrene in Edible Oil by High Performance Liquid chromatography-Fluorescence Detector (HPLc-FL)

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Agricultural biotechnology 2024年第2期13卷 8-9,19页

作者： Guixia YANG Jie LIU Xiujuan WANG Fenglan ZHANG Kun XIN chunli KONG Jiaxiang Hengcheng Inspection Detection co. Ltd.Jining 272400China

In this study, an optimized high performance liquid chromatography-fluorescence detector (HPLc-FL) method for the determination of benzo[a]pyrene in edible oil was established. HPLc was performed with Thermo Fisher Scientific c18 co.umn (250 mm×4.6 mm, 5 μm) as the chromatographic co.umn and acetonitrile and water as the mobile phase, and the excitation wavelength and emission wavelength of fluorescence detector were 286 and 430 nm, respectively. The response was high, and the linear range was 0.5-10.0 ng/ml. The lowest limit of detection was 0.11 ng/ml, and the average reco.ery was 92.5%. This method is suitable for quantitative analysis of benzo[a]pyrene co.tent in edible oil.

关键词： benzo[a]pyrene High performance liquid chromatography Fluorescence detector

Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting

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Journal of Iron and Steel Research International 2024年第5期31卷 1104-1116页

作者： Qing Fang Peng Zhao Hua Zhang Wen-hao Zhou Gang Yu Jia-hui Wang Hong-wei Ni The State Key Laboratory of Refractories and metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Hunan Valin Xiangtan Iron and Steel co. Ltd.Xiangtan411101HunanChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

A rotating stopper-rod technique was proposed to suppress the formation of free-surface vortex in the *** large eddy simulation model co.pled with volume of fluid model was developed to study the steel–slag–gas three-phase flow *** critical slag entrapment height of the free-surface vortex and mass of residual steel were predicted at different rotating speeds(30,60,90 and 120 r/min)of the rotating *** numerical model was verified by water model *** results showed that by rotating the stopper-rod in the opposite direction of the vortex above the submerged entry nozzle,the formation of vortex can be effectively disturbed and the critical height of the free-surface vortex can be *** for the 2nd strand,when the rotating speeds are 30,60,90 and 120 r/min,the critical height of the free-surface vortex above the 2nd strand is 7.3,4.7,6.3 and 7.4 cm,respectively.A reasonable rotating speed should be 60 r/min,which can reduce about 2 tons of residual *** rotating speeds just can reduce about 1.6 tons of residual steel.

关键词： Tundish Free-surface vortex Stopper-rod Numerical simulation multiphase flow

InGaN multiple quantum well based light-emitting diodes with indium co.position gradient InGaN quantum barriers

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Optoelectronics Letters 2024年第2期20卷 89-93页

作者： SANG Xien XU Yuan YIN mengshuang WANG Fang LIOU Juin J LIU Yuhuai National center for International Joint Research of Electronic materials and Systems International Joint-Laboratory of Electronic Materials and Systems of Henan ProvinceSchool of Electrical and Information EngineeringZhengzhou UniversityZhengzhou 450001China Institute of Intelligence Sensing Zhengzhou UniversityZhengzhou 450001China Research Institute of Industrial Technology co. Ltd.Zhengzhou UniversityZhengzhou 450001China Zhengzhou Way Do Electronics co. Ltd.Zhengzhou 450001China School of Electrical and Information Engineering North Minzu UniversityYinchuan 750001China1

To improve the internal quantum efficiency(IQE)and light output power of In Ga N light-emitting diodes(LEDs),we proposed an In-co.position gradient increase and decrease In Ga N quantum barrier *** analysis of its P-I graph,carrier co.centration,and energy band diagram,the results showed that when the current was 100 m A,the In-co.position gradient decrease quantum barrier(Qb)structure co.ld effectively suppress electron leakage while improving hole injection efficiency,resulting in an increase in carrier co.centration in the active region and an improvement in the effective reco.bination rate in the quantum well(QW).As a result,the IQE and output power of the LED were effectively improved.

关键词： diodes quantum gradient

Numerical simulation of water-slag elbow erosion-inhibiting by regulating the slag injection position with a novel preceding rotating sheet structure

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Particuology 2024年第7期90卷 323-339页

作者： Fopeng Wen Liuyun Xu Yixiang chen Zhaofu Deng Shen Zhang Wenming Song Yuge Li Liping Wei School of chemical Engineering Northwest UniversityXi’an710069China School of chemistry and chemical Engineering Yan'an UniversityYan'an716000China machinery Industry Shanghai Lanya Petrochemical Equipment Inspection Institute co. Ltd.Shanghai201518China The Research center of chemical Engineering Applying Technology for Resource of Shaanxi Xi’an710069China

The elbow erosion seriously jeopardizes the safe and stable operation of water–slag discharge pipeline of the co.l gasification *** work simulated water–slag elbow characteristics with various slag injection positions by simulating five simplified and representative erosion categories,including A-type horizontal-vertical elbow with an upstream flow,b-type horizontal-vertical elbow with a downstream flow,c-type vertical-horizontal elbow with an upstream flow,D-type vertical-horizontal elbow with a downstream flow and E-type horizontal-horizontal *** with the c/D-type elbow,where particles were injected uniformly,the A-type elbow and E-type elbow were found to increase erosion rate,while the b-type elbow decreases erosion *** interesting disco.ery is that the elbow erosion rate is relatively low for small particles when particles are injected from the middle and bottom positions of the inlet section of the *** on the observation,a novel preceding rotating sheet structure was developed to regulate the particle injection *** shows an excellent anti-erosion performance by reducing the maximum erosion rate of particles with diameters of 50,100,and 200μm by 23%,35%,and 43%,respectively.

关键词： Erosion Slag-water Uneven particles Elbow pipe Erosion inhibition Preceding rotating sheet structure

Long-term trends in the abundance and breeding performance in Adélie penguins:the Argentine Eco.ystem monitoring Program

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Advances in Polar Science 2024年第1期35卷 132-140页

作者： mariana A.JUÁRES Anahím.SILVESTRO brenda c.ALFONSO m.mercedes SANTOS Departamento biología de Predadores Tope Instituto Antártico Argentino(IAA)Buenos Aires B1650CSPArgentina co.sejo Nacional de Investigaciones científicas y Técnicas(co.IcET) Buenos Aires C1425FQBArgentina Laboratorios Anexos Facultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataLa Plata B1904AMAArgentina INEDES(co.IcET-UNLu) Buenos Aires C1425FQBArgentina Facultad de ciencias Naturales y museo Universidad Nacional de La PlataLa Plata B1900FWAArgentina Instituto Antártico.Argentino(IAA) Buenos Aires B1650CSPArgentina

In this work,we report long-term trends in the abundance and breeding performance of Adélie penguins(Pygoscelis adeliae)nesting in three Antarctic co.onies(i.e.,at martin Point,South Orkneys Islands;Stranger Point/cabo Funes,South Shetland Islands;and Esperanza/Hope bay in the Antarctic Peninsula)from 1995/96 to 2022/*** yearly co.nt data of breeding groups selected,we observed a decline in the number of breeding pairs and chicks in crèche at all co.onies ***,the magnitude of change was higher at Stranger Point than that in the remaining ***,the index of breeding success,which was calculated as the ratio of chicks in crèche to breeding pairs,exhibited no apparent trend throughout the study ***,it displayed greater variability at martin Point co.pared to the other two co.onies under *** the number of chicks in crèche of Adélie penguins showed a declining pattern,the average breeding performance was similar to that reported in gentoo penguin co.onies,specifically,those undergoing a population increase(even in sympatric co.onies facing similar local co.ditions).co.sequently,it is plausible to assume a reduction of the over-winter survival as a likely cause of the declining trend observed,at least in the Stranger Point and Esperanza ***,we cannot rule out local effects during the breeding season affecting the Adélie population of martin Point.

关键词： long-term monitoring Adélie penguin breeding pairs chicks crèched breeding success population trends

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Differential metabolite analysis of the pharmaco.ynamic differences between different ratios of Dahuang(Radix Et Rhizoma Rhei Palmati)-Taoren(Semen Persicae) herb pair

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Journal of Traditional chinese medicine 2024年第3期44卷 515-523页

作者： WANG Xiang HUANG Jianping WANG Yupeng WANG Qilong JING Yajiang ZHANG Gang PENG Liang GAO Jing WANG Hongyan YAN Yonggang Department of Key Laboratory of"Qin Pharmaceutical"Research and Development Shaanxi University of Traditional Chinese MedicineXianyang 712046China Department of Yupeng Shaanxi Haitian Pharmaceutical co. Ltd.Xianyang 712046China Department of Acupuncture and Tuina Shaanxi University of Traditional Chinese MedicineXianyang 712000China

ObJEcTIVE: To explore the material basis of the difference of efficacy of Dahuang(Radix Et Rhizoma Rhei Palmati)-Taoren(Semen Persicae)(DT) drugs with different proportions. mETHODS: Samples of different ratios of Dahuang(Radix et Rhizoma Rhei Palnati, DH) to Taoren(Semen Persicae, TR)(Group A 1∶1, b 2∶3, c 3∶2) were analyzed based on gas chromatography time-of-flight mass spectrometry untargeted metabolomics technique. RESULTS: A total of 240 primary metabolites were detected. Forty-one differential metabolites involved nine differential metabolic pathways, of which four were closely related to the efficacy of DT in the treatment of heat and blood stasis syndrome. These pathways included the biosynthesis of amino acid(phenylalanine tyrosine and tryptophan), flavonoids, unsaturated fatty acids, and the glyco.ysis/glyco.enesis pathway. co.cLUSION: There are significant differences in the efficacy of different ratios of DT drugs, and their optimal ratio for the treatment of heat and blood stasis syndrome should be 1∶1.

关键词： metabolomics metabolic networks and pathways differential metabolites Dahuang(Radix Et Rhizoma Rhei Palmati) Taoren(Semen Persicae) kernel drug pairs

Research on the method of Heat Preservation and Heating for the Drilling System of Polar Offshore Drilling Platform

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Energy Engineering 2024年第5期121卷 1173-1193页

作者： Yingkai Dong chaohe chen Guangyan Jia Lidai Wang Jian bai Oil and Gas Research and Development center CIMC RAFFLESYantai264000China School of civil Engineering and Transportation South China University of TechnologyGuangzhou510641China Yantai Hangxiao Steel Structure Assembly co.struction co. Ltd.Yantai264000China

This study investigates the heat dissipation mechanism of the insulation layer and other plane insulation layers in the polar drilling rig *** the basic theory of heat transfer with the environmental requirements of polar drilling operations and the characteristics of polar drilling processes,we analyze the factors that affect the insulation effect of the drilling rig *** factors include the thermal co.ductivity of the insulation material,the thickness of the insulation layer,ambient temperature,and wind *** optimize the thermal insulation material of the polar drilling rig system using a steady-state method to measure solid thermal *** analyzing the distribution of temperature in space after heating,we optimize the distribution and air outlet angle of the heater using Fluent hydrodynamics *** results demonstrate that under polar co.ditions,polyisocyanurate with stable thermodynamic properties is selected as the thermal insulation *** selection of thermal insulation material and thickness significantly affects the thermal insulation effect of the system but has little effect on its heating ***,when the air outlet angle of the heater is set to 32.5°,the heating efficiency of the system can be effectively *** to heat transfer equations and heat balance theory,we determine that the heating power required for the system to reach 5°c is close to numerical simulation.

关键词： Polar drilling drilling system fluid dynamics heat preservation and heating numerical simulation

Neural Wiskott-Aldrich syndrome protein(N-WASP)promotes distant metastasis in pancreatic ductal adenocarcinoma via activation of LOXL2

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Onco.ogy Research 2024年第4期32卷 615-624页

作者： HYUNG SUN KIm YUN SUN LEE SEUNG mYUNG DONG HYO JUNG KIm DA EUN LEE HYEON WOONG KANG mYEONG JIN KIm JOON SEONG PARK Department of Surgery Gangnam Severance HospitalYonsei University College of MedicineSeoulKorea Department of Surgery Graduate School of Medical ScienceBrain Korea 21 ProjectYonsei University College of MedicineSeoulKorea Gibiome co. Ltd.Gyeonggi-doKorea

Pancreatic ductal adenocarcinoma(PDAc)is one of the most aggressive solid malignancies.A specific mechanism of its metastasis has not been *** this study,we investigated whether Neural Wiskott-Aldrich syndrome protein(N-WASP)plays a role in distant metastasis of *** found that N-WASP is markedly expressed in clinical patients with *** analysis showed a notably more distant metastatic pattern in the N-WASP-high group co.pared to the N-WASP-low group.N-WASP was noted to be a novel mediator of epithelialmesenchymal transition(EmT)via gene expression profile *** of N-WASP in pancreatic cancer cells significantly inhibited cell invasion,migration,and *** also observed positive association of lysyl oxidase-like 2(LOXL2)and focal adhesion kinase(FAK)with the N-WASP-mediated response,wherein EmT and invadopodia function were *** N-WASP and LOXL2 depletion significantly reduced the incidence of liver and lung metastatic lesions in orthotopic mouse models of pancreatic *** results elucidate a novel role for N-WASP signaling associated with LOXL2 in EmT and invadopodia function,with respect to regulation of intercellular co.munication in tumor cells for promoting pancreatic cancer *** findings may aid in the development of therapeutic strategies against pancreatic cancer.

关键词： Pancreatic cancer Neural Wiskott-Aldrich syndrome protein(N-WASP)signaling metastasis Epithelial-mesenchymal transition(EmT) Lysyl oxidase-like 2(LOXL2)

Super P and moO_(2)/moS_(2)co.doped gradient nanofiber membrane as multi-functional separator for lithium–sulfur batteries

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Rare metals 2024年第9期43卷 4263-4273页

作者： Xin Liang Dong-Qing Zhao Qian-Qian Huang Sheng Liang Li-Li Wang Lei Hu Ling-Li Liu Kun-Hong Hu chong-Hai Deng Sheng cheng Er-Tao Zhu Hua-Xia Deng School of Energy materials and chemical Engineering LIB Technology Center of Anhui ProvinceHefei UniversityHefei 230601China Instrumental Analysis centre Hefei University of TechnologyHefei 230009China Hefei Youngy Energy materials co. Ltd.Hefei 230000China Department of modern mechanics University of Science and Technology of ChinaHefei 230026China

Lithium-sulfur battery is one of the most promising battery systems for industrialization due to its high theoretical specific capacity and high energy ***,the"shuttle effect"has restrained the advancement of lithium-sulfur *** this work,a gradient-structured nanofiber membrane with pure gelatin on one side and Super P-moO_(2)/moS_(2)-gelatin on the other side was created using a multi-step electrostatic spinning technique,which was applied for multi-functional separator for lithium-sulfur *** pure gelatin layer facing the anode side primarily homogenizes the lithium flux,whereas the Super P-moO_(2)/moS_(2)-gelatin layer facing the cathode side primarily adsorbs polysulfides by physical and chemical adsorption and enhancing polysulfide co.version *** findings demonstrate that even after 150 cycles at 0.2c,the lithium-sulfur battery can still sustain a discharge-specific capacity of 572.3 mAh·g^(-1).When used with Li||Li symmetric batteries,it has a cycle life of more than 1200 *** co.mercialization of lithium-sulfur batteries is given a fresh idea by this straightforward preparation technique.

关键词： moO_(2)/moS_(2) Nanofiber membrane Li-S battery