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Nanostructured AlFeO_(3) thin films as a novel photoanode for photoelectrochemical water splitting

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Nano Research 2024年第3期17卷 1075-1085页

作者： Xin Sun Min Wang qi Geng Shuailin Chen Xiaojun lv Xunlei Ding Meicheng Li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing 102206China School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

The earth-abundant and robust aluminum ferrite,AlFeO_(3)(AFO),is mainly studied in the context of ***,we demonstrate that AFO can be used as a stable solar absorber in photoelectrochemical cells for solar water splitting,exhibiting attractive *** is the first report on the photoelectrochemical activity of *** thin-film photoelectrodes prepared by solution-processing methods are composed of vertically oriented thin nanosheets,featuring the rhombohedral symmetry(R3c)and n-type *** as-prepared AFO photoanodes generate a photocurrent density of+0.78 mA·cm^(-2) at 1.23 V *** hydrogen electrode(RHE)with the photocurrent _(onset) potential(U_(onset))close to the flat band potential of 0.5 V *** in the presence of hole ***,the U_(onset) of AFO for solar water splitting coincides with the flat band potential as well,which is rare in n-type inorganic *** also report other properties of AFO associated with photoelectrochemical *** films exhibit a band gap energy of 2.31 eV and positive band edges with low ***,the carrier lifetimes in AFO films are up to millisecond timescales under the mediation of defect *** on the photoelectrochemical behavior and optoelectronic properties,we believe that AFO has great potential for application in photoelectrochemical cells.

关键词： AlFeO_(3) photoanode nanosheets photoelectrochemistry onset potential

Effects of two polybrominated diphenyl ethers(BDE-47,BDE-209) on the swimming behavior, population growth and reproduction of the rotifer Brachionus plicatilis

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Journal of Environmental Sciences 2015年第2期27卷 54-63页

作者： Jingjing Sha You Wang Jianxia lv Hong Wang Hongmei Chen Leilei qi Xuexi Tang Department of Marine Ecology College of Marine Life Sciences Ocean University of China Thermo Fisher Scientific (Beijing) Co. Ltd.

Polybrominated diphenyl ethers（PBDEs） are new kinds of persistent organic pollutants（POPs） and their potential threats to the equilibrium and sustainability of marine ecosystems have raised worldwide concerns. Here, two kinds of PBDEs, tetra-BDE（BDE-47）and deca-BDE（BDE-209） were applied, and their toxic effects on the swimming behavior,population growth and reproduction of Brachionus plicatilis were investigated. The results showed that：（1） The actual concentrations of BDE-47 and-209 in the seawater phase measured by GC–MS（Gas Chromatography-Mass Spectrometer） were much lower than their nominal concentrations.（2） In accordance with the 24-hr acute tests, BDE-209 did not show any obvious swimming inhibition to rotifers, but a good correlation did exist between the swimming inhibition rate and BDE-47 concentration suggesting that BDE-47 is more toxic than BDE-209.（3） Both BDE-47 and-209 had a significant influence on the population growth and reproduction parameters of B. plicatilis including the population growth rate, the ratio of ovigerous females/non-ovigerous females（OF/NOF）, the ratio of mictic females/amictic females（MF/AF）, resting egg production and the mictic rate, which indicate that these parameters in B. plicatilis population were suitable for monitoring and assessing PBDEs. Our results suggest that BDE-47 and-209 are not acute lethal toxicants and may pose a low risk to marine rotifers at environmental concentrations for short-term exposure. They also accumulate differently into rotifers. Further research data are needed to understand the mechanisms responsible for the effects caused by PBDEs and to assess their risks accurately.

关键词： BDE-47 BDE-209 Brachionus plicatilis Swimming inhibition Population growth Reproductive toxicity

Improving sound diffusion in a reverberation tank using a randomly fluctuating surface

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Chinese Physics B 2022年第6期31卷 450-458页

作者： qi Li Dingding Xie Rui Tang Dajing Shang Zhichao lv Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbin 150001China Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information TechnologyHarbin 150001China College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China

Underwater reverberation environments that satisfy the conditions of uniformity and isotropy of the diffuse field can be used to measure the acoustic characteristics of underwater *** study combines two practical indicators—the standard deviation of the absolute sound pressure field(to indicate uniformity)and the analysis of the wavenumber spectrum in the spherical harmonics domain(to indicate isotropy)—for an accurate evaluation of the diffusion of the sound field in a reverberation tank.A method is proposed that can improve the narrow-band diffusion of the sound field by employing a randomly fluctuating *** acoustic experiment was performed in a reverberation water tank(1.2 m×1 m×0.8 m),where a randomly fluctuating surface was generated by making *** experimental results show that as the wave motion contributes effectively to the random reflection of sound rays in all directions,the uniformity and isotropy are improved significantly when the surface is fluctuating *** work helps to ensure accurate measurements of the characteristics of underwater targets in reverberation tanks.

关键词： sound diffusion reverberation tank randomly fluctuating surface acoustic measurements

Pressure Drop of Liquid–Solid Two-Phase Flow in the Vertical Tube Bundle of a Cold-Model Circulating Fluidized Bed Evaporator

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Transactions of Tianjin University 2019年第6期25卷 618-630页

作者： Feng Jiang Siyao lv Guopeng qi Xiaoling Chen Xiulun Li School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China School of Biological and Environmental Engineering Tianjin Vocational InstituteTianjin 300410China

A cold-model vertical multi-tube circulating fluidized bed evaporator was designed and built to conduct a visualization study on the pressure drop of a liquid–solid two-phase flow and the corresponding particle *** and polyformaldehyde particle(POM)were used as the liquid and solid phases,*** effects of operating parameters such as the amount of added particles,circulating flow rate,and particle size were systematically *** results showed that the addition of the particles increased the pressure drop in the vertical tube *** maximum pressure drop ratios were 18.65%,21.15%,18.00%,and 21.15%within the experimental range of the amount of added particles for POM1,POM2,POM3,and POM4,*** pressure drop ratio basically decreased with the increase in the circulating flow rate but fluctuated with the increase in the amount of added particles and particle *** difference in pressure drop ratio decreased with the increase in the circulating flow *** the amount of added particles increased,the difference in pressure drop ratio fluctuated at low circulating flow rate but basically decreased at high circulating flow *** pressure drop in the vertical tube bundle accounted for about 70%of the overall pressure drop in the up-flow heating chamber and was the main component of the overall pressure within the experimental ***-dimensional phase diagrams were established to display the variation ranges of the pressure drop and pressure drop ratio in the vertical tube bundle corresponding to the operating *** research results can provide some reference for the application of the fluidized bed heat transfer technology in the industry.

关键词： Pressure drop Liquid-solid two-phase flow Circulating fluidized bed evaporator Vertical tube bundle Heat transfer enhancement Fouling prevention Descaling

Nanodiamond films deposited at moderate temperature on pure titanium substrate pretreated by ultrasonic scratching in diamond powder suspension

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Journal of University of Science and Technology Beijing 2006年第6期13卷 542-545页

作者： Syed Jawid Askari Fanxiu lv Akhtar Farid Fengying Wang qi He Zuyuan Zhou Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China ES Department PNEC PNS Jauhar National University of Sciences ＆ Technology Karachi-75350 Pakistan

Nanocrystalline diamond （NCD） film deposition on pure titanium and Ti alloys is extraordinarily difficult because of the high diffusion coefficient of carbon in Ti, the large mismatch in their thermal expansion coefficients, the complex nature of the interlayer formed during diamond deposition, and the difficulty to achieve very high nucleation density. In this investigation, NCD films were successfully deposited on pure Ti substrate by using a novel substrate pretreatment of ultrasonic scratching in a diamond powder-ethanol suspension and by a two-step process at moderate temperature. It was shown that by scratching with a 30-μm diamond suspension for 1 h, followed by a 10-h diamond deposition, a continuous NCD film was obtained with an average grain size of about 200 nm. Detailed experimental results on the preparation, characterization, and successful deposition of the NCD films on Ti were discussed.

关键词： nanocrystalline diamond film pure Ti substrate nucleation enhancement moderate temperature

Modulating 3D memristor synapse by analog spiking pulses for bioinspired neuromorphic computing

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Science China(Physics,Mechanics & Astronomy) 2018年第8期61卷 75-81页

作者： qi Liu XuMeng Zhang qing LUO XiaoLong Zhao HangBing lv ShiBing Long Ming Liu Key Laboratory of Microelectronics Device&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Memristor based artificial synapses have demonstrated great potential for bioinspired neuromorphic computing in recent years. To emulate synaptic fimctions, such as short-term plasticity and long-term potentiation/depression, square pulses or combined complex pulse groups are applied on the device. However, in biological neuron systems, the action potentials are analog pulses with similar amplitudes. Furthermore, in biological systems, the intensity of the stimulus is coded into the frequency of action potentials to modulate the weight of synapses. Toward this programming method, we applied a series of analog spiking pulses with same peaks on Ru/TiOJTiN 3D memristor to emulate synaptic functions, such as long-term potentiation/depression and synaptic saturation. Moreover, we demonstrated the conductance change of the device under different stimulus frequencies of analog spiking pulses and described the statistical results of conductance change value, which shows that the device conductance has a larger change value under a higher spiking frequency with identical pulse number. These results show that the analog spiking pulses can well modulate the memristor-based synaptic weight and have a great potential for bioinspired computing in the future.

关键词： 3D memristor analog spiking pulses artificial synapse spiking frequency

Norisoboldine, a natural aryl hydrocarbon receptor agonist, alleviates TNBS-induced colitis in mice, by inhibiting the activation of NLRP3 inflammasome

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Chinese Journal of Natural Medicines 2018年第3期16卷 161-174页

作者： lv qi WANG Kai qiAO Si-Miao DAI Yue WEI Zhi-Feng Department of Pharmacology of Chinese Materia Medica China Pharmaceutical University

Although the etiology of inflammatory bowel disease is still tmcertain, increasing evidence indicates that the excessive activation of NLRP3 inflammasome plays a major role. Norisoboldine （NOR）, an alkaloid isolated from Radix Linderae, has previously been demonstrated to inhibit inflammation and IL-1,8 production. The present study was to examine the effect of NOR on colitis and the underlying mechanism related to NLRP3 inflammasome activation. Our results showed that NOR alleviated colitis symptom in mice induced by 2, 4, 6-trinitrobenzene sulfonic acid （TNBS）. Moreover, it significantly reduced expressions of cleaved IL-lfl, NLRP3 and cleaved Caspase-1 but not ASC in colons of mice. In THP-1 cells, NOR suppressed the expressions of NLRP3, cleaved Caspase-1 and cleaved IL-1β but not ASC induced by lipopolysaccharide （LPS） and adenosine triphosphate （ATP）. Furthermore, NOR could activate aryl hydrocarbon receptor （AhR） in THP-1 cells, inducing CYP1A1 mRNA expression, and promoting dissociation of AhR/HSP90 complexes, association of AhR and ARNT, AhR nuclear translocation, XRE reporter activity and binding activity of AhR/ARNT/XRE. Both siAhR and a-naphthoflavone （a-NF） markedly diminished the inhibition of NOR on NLRP3 inflammasome activation. In addition, NOR elevated Nrf2 level and reduced ROS level in LPS- and ATP-stimulated THP-1 cells, which was reversed by either siAhR or α-NF treatment. Finally, correlations between activation of AhR and attenuation of colitis, inhibition of NLRP3 inflammasome activation and up-regulation of Nrf2 level in colons were validated in mice with TNBS-induced colitis. Taken together, NOR ameliorated TNBS-induced colitis in mice through inhibiting NLRP3 inflammasome activation via regulating AhR/Nrf2/ROS signaling pathway.

关键词： Norisoboldine Inflammatory bowel disease NLRP3 inflammasome Aryl hydrocarbon receptor

Direct Synthesis of Co-doped Graphene on Dielectric Substrates Using Solid Carbon Sources

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Nano-Micro Letters 2015年第4期7卷 368-373页

作者： qi Wang Pingping Zhang qiqi Zhuo Xiaoxin lv Jiwei Wang Xuhui Sun Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano & Soft Materials Soochow University

Direct synthesis of high-quality doped graphene on dielectric substrates without transfer is highly desired for simplified device processing in electronic ***,graphene synthesis directly on substrates suitable for device applications,though highly demanded,remains unattainable and ***,a simple and transfer-free synthesis of high-quality doped graphene on the dielectric substrate has been developed using a thin Cu layer as the top catalyst and polycyclic aromatic hydrocarbons as both carbon precursors and doping sources.N-doped and N,F-co-doped graphene have been achieved using TPB and F16Cu Pc as solid carbon sources,*** growth conditions were systematically optimized and the as-grown doped graphene were well *** growth strategy provides a controllable transfer-free route for high-quality doped graphene synthesis,which will facilitate the practical applications of graphene.

关键词： Graphene Solid carbon sources Transfer-free Doping and co-doping

Fat-poor renal angiomyolipoma with prominent cystic degeneration:A case report and review of the literature

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World Journal of Clinical Cases 2023年第2期11卷 417-425页

作者： Shi-qi Lu Wei lv You-Jun Liu Huan Deng Medical College Nanchang UniversityNanchang 330006Jiangxi ProvinceChina Department of Gastroenterology West China HospitalSichuan UniversityChengdu 610044Sichuan ProvinceChina Department of Radiology The Fourth Affiliated Hospital of Nanchang UniversityNanchang 330003Jiangxi ProvinceChina Department of Pathology The Fourth Affiliated Hospital of Nanchang UniversityNanchang 330003Jiangxi ProvinceChina

BACKGROUND Angiomyolipoma(AML),the most common benign tumor of the kidney,is usually composed of dysmorphic blood vessels,smooth muscle,and mature adipose *** our knowledge,AML with cystic degeneration has rarely been *** degeneration,hemorrhage,and a lack of fat bring great challenges to the *** SUMMARY A 60-year-old man with hypertension presented with a 5-year history of cystic mass in his left *** fell 2 mo ago.A preoperative computed tomography(CT)scan showed a mixed-density cystic lesion without macroscopic fat density,the size of which had increased compared with before,probably due to hemorrhage caused by a *** nephrectomy was *** studies revealed that the lesion mainly consisted of tortuous,ectatic,and thick-walled blood vessels,mature adipose tissue,and smooth muscle-like spindle cells arranged around the abnormal blood *** tumor cells exhibited positivity for human melanoma black-45,Melan-A,smooth muscle actin,calponin,S-100,and neuron-specific enolase,rather than estrogen receptor,progesterone receptor,CD68,and *** Ki-67 labeling index was less than 5%.The final diagnosis was a fat-poor renal AML(RAML)with prominent cystic *** When confronting a large renal cystic mass,RAML should be included in the differential diagnosis.

关键词： Kidney Angiomyolipoma Cystic degeneration Pathogenesis Diagnosis Case report