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| 1 | Dual-Wavelength Laser Flash Raman Spectroscopy Method for In-Situ Measurements of the Thermal Diffusivity: Principle and Experimental Verification显示文摘This paper presents an in-situ, non-contact, non-destructive 'dual-wavelength laser flash Raman spectroscopy method' for measuring the thermal diffusivity. In this method, a heating pulse is used to heat the sample and another pulsed laser with a different wavelength and negligible heating effect is used as a probe to measure the sample temperature changes during the heating and cooling periods from the Raman peak shifts. The sample temperature rise and fall curves are measured by changing the delay between the heating pulse and the probing pulse with the thermal diffusivity then characterized by fitting the temperature curves. The time delay between the heating and probing pulses can be precisely controlled with a minimum step of 100 ps. Hence, the temperature variation can be scanned with an ultra-high temporal resolution of up to 100 ps, which significantly improves the measurement accuracy of transient thermal parameters. The measurement accuracy of this method has been verified using a bulk material model and experiments. The measured thermal diffusivity of a silicon sample has been obtained to be 8.8×10^(-5 )m^2/s with a 3% difference between the measured value and the average result for bulk silicon in the literature which verifies the reliability and accuracy of this method. | FAN Aoran HU Yudong MA Weigang WANG Haidong ZHANG Xing | 2019 | Journal of Thermal Science2019，28，2： | 4 |
| 2 | Dual-wavelength flash Raman mapping method for measuring thermal diffusivity of the suspended nanowire显示文摘In this paper,we present a dual-wavelength flash Raman(DFR)mapping method for measuring the thermal diffusivity of a suspended nanowire.A heating pulse is used to heat the nanowire sample,and a probing pulse of different wavelength is used to measure the increase in temperature.The laser absorption coefficient can be eliminated by normalization,and the thermal diffusivity of the sample can be extracted from the normalized temperature increase.An infinite heat conduction model is used in this method to avoid the influence of boundary thermal resistance.By changing the position of the probing laser center,the measurement sensitivity of thermal diffusivity can be further improved.The position of maximum sensitivity is influenced by the thermal diffusivity of the nanowire,width of the heating pulse,radius of the heating laser spot,and characteristic length of the sample.To comprehensively analyze the influences of the various parameters,obtain the best measurement conditions,and attain maximum sensitivity,we propose a dimensionless physical model to analyze the heat conduction of the suspended nanowire.Based on the analysis of the best dimensionless parameters,the corresponding appropriate measurement conditions can be determined.Sensitivity analysis shows that when the radius of the heating laser spot is 1%of the length of the nanowire,the sensitivity of the DFR mapping method can be more than four times that of the concentric DFR method for measuring the thermal diffusivity of the nanowire. | HU YuDong FAN AoRan WANG HaiDong MA WeiGang ZHANG Xing | 2020 | Science China(Technological Sciences)2020，63，5： | 2 |
| 3 | Salt transport in polymeric pervaporation membrane显示文摘The salt transport in a PEBA membrane used in pervaporative desalination was studied.The concentration profile of salt in the membrane during pervaporation was investigated experimentally using a multilayer membrane.The salt was found to be sorbed in the membrane but was not removed during the pervaporative desalination process,and the salt concentration in the membrane varied linearly with position.High purity water was obtained as the permeate as long as the permeate side was kept dry under vacuum.The accumulated salt uptake in the membrane follows the order of MgCl2 N NaCl N Na2 SO4.The solubility of salt in the membrane follows the order of MgCl2 N NaCl N Na2 SO4.Both the permeability and diffusivity of salt in the membrane follow the order of NaCl N MgCl2 N Na2 SO4.The permeability of salt in the membrane is not influenced by the feed salt concentration.It is mainly determined by the diffusion coefficients. | Dihua Wu Aoran Gao Xianshe Feng | 2020 | Chinese Journal of Chemical Engineering2020，28，3： | 1 |
| 4 | Ultra-short-term wind power prediction based on chaos phase space re- construction and NWP显示文摘 | Gao Yang Xu Aoran Zhao Yan | 2015 | International Journal of Con- trol and Automation2015，8，5： | 1 |
| 5 | Reduction in thermal conductivity of monolayer WS_(2) caused by substrate effect显示文摘Understanding the substrate and temperature effect on thermal transport properties of transition metal dichalcogenides(TMDs)monolayers are crucial for their future applications.Herein,a dual-wavelength flash Raman(DF-Raman)method is used to measure the thermal conductivity of monolayer WS_(2) at a temperature range of 200–400 K.High measurement accuracy can be guaranteed in this method since the influence of both the laser absorption coefficient and temperature-Raman coefficient can be eliminated through normalization.The room-temperature thermal conductivity of suspended and supported WS_(2) are 28.5±2.1(30.3±2.0)and 15.4±1.9(16.9±2.1)W/(m·K),respectively,with a~50%reduction due to substrate effect.Molecular dynamics(MD)simulations reveal that the suppression of acoustic phonons is mainly responsible for the striking reduction.The behaviors of optical phonons are also unambiguously investigated using Raman spectroscopy,and the in-plane optical mode,E(Γ),is surprisingly found to be slightly enhanced while out-of-plane mode,A1g(Γ),is suppressed due to substrate interaction,mutually verified with MD results.Our study provides a solid understanding of the phonon transport behavior of WS_(2) with substrate interaction,which provides guidance for TMDs-based nanodevices. | Yufeng Zhang Qian Lv Aoran Fan Lingxiao Yu Haidong Wang Weigang Ma Ruitao Lv Xing Zhang | 2022 | Nano Research2022，15，10： | 1 |
| 6 | Motor network reorganization in stroke patients with dyskinesias during a shoulder-touching task:A fNIRS study显示文摘Hemiplegia after stroke has become a major cause of the world's high disabilities,and it is vital to enhance our understanding of post-stroke neuroplasticity to develop e±cient rehabilitation programs.This study aimed to explore the brain activation and network reorganization of the motor cortex(MC)with functional near-infrared spectroscopy(fNIRS).The MC hemodynamic signals were gained from 22 stroke patients and 14 healthy subjects during a shoulder-touching task with the right hand.The MC activation pattern and network attributes analyzed with the graph theory were compared between the two groups.The results revealed that healthy controls presented dominant activation in the left MC while stroke patients exhibited dominant activation in the bilateral hemispheres MC.The MC networks for the two groups had small-world properties.Compared with healthy controls,patients had higher transitivity and lower global e±ciency(GE),mean connectivity,and long connections(LCs)in the left MC.In addition,both MC activation and network attributes were correlated with patient's upper limb motor function.The results showed the stronger compensation of the unaffected motor area,the better recovery of the upper limb motor function for patients.Moreover,the MC network possessed high clustering and relatively sparse inter-regional connections during recovery for patients.Our results promote the understanding of MC reorganization during recovery and indicate that MC activation and network could provide clinical assessment signi¯cance in stroke patients.Given the advantages of fNIRS,it shows great application potential in the assessment and rehabilitation of motor function after stroke. | Yizheng Zhang Dan Wang Dongyang Wang Kecheng Yan Li Yi Shuoshu Lin Guangjian Shao Zhiyong Shao Jinyan Sun Aoran Yang | 2023 | Journal of Innovative Optical Health Sciences2023，16，6： | 1 |
| 7 | Separation performance of multi-components solution by membrane technology in continual diafiltration mode显示文摘 | Liming Zhao Hefei Zhao Phuongbinh Nguyen Aoran Li Lihua Jiang Quanming Xia Yi Rong Yongjun Qiu Jiachun Zhou | 2013 | Desalination2013，，： | 1 |
| 8 | A robotic AI-Chemist system for multi-modal AI-ready database显示文摘Artificial intelligence(AI)is being increasingly used in chemical research,not only to make accurate predictions,but also to extract hidden physical laws from the data.Massive high-quality data can give AI powerful capabilities,as demonstrated by the successes of Alpha Fold and generative pre-trained transformer(GPT).Existing scientific data are multisource,multi-type,non-quality-assured. | Shuo Feng Aoran Cai Yang Wang Baicheng Zhang Qinyu Qiao Cheng Chen Song Wang Jun Jiang | 2023 | National Science Review2023，10，12： | 0 |
| 9 | Granular avalanche statistics in rotating drum with varied particle roughness显示文摘We experimentally investigate the avalanche statistics of dry granular materials in a slowly rotating drum for five types of beads with varied surface roughness.For all beads,two distinct angles,i.e.,repose angleθr and maximal angleθm,can be clearly defined,and the avalanche size distributions P(δθ)are Gaussian-like.θr,θm,and the span in P(δθ)are all positively correlated with bead surface roughness.This observation thus contrasts with a power-law P(δθ)predicted by self-organized criticality,but is reminiscent of a first-order phase transition.We speculate that both the inertia effect and the velocity-weakening mechanism during an avalanche process can enhance the first-order features,which are however absent in plasticity of sheared amorphous solids.We also discuss the dependence betweenθr andθm for various particles,as well as the correlation between starting and stopping angles for an individual avalanche. | Aoran Peng Ye Yuan Yujie Wang | 2023 | National Science Open2023，2，3： | 0 |
| 10 | The behavioral significance of resting state network after stroke:A study via graph theory analysis with near-infrared spectroscopy显示文摘Accurate assessment of motor abilties for stroke patients is the basis for optimizing rehabilitation strategy.Previous studies have shown that functional connectivity under resting state(RS)is associated with motor dysfunction after stroke,However,the utlity of topological properties of RS as a potential indicator for motordeficits after stroke has been litle explored and needs more validation.in this study,near-i frared spectroscopywas used to measure the hemodynamic signals at the frontal cortex under RS and investigate the associationbetween the network topological characteristics via graph theory analysis and the motor finction for strokepatients.Seventen patients participated in this study.Our results showed that the frontal network pres ented thesmallworld properties under Rs,The global eficiency of the network was positively correlated with the Fugl.Meyer asssment(FMA)for patients.Meanwhile,there was a trend that the characteristic path length of thenetwork positively corelated with patients'FMA.Our findings suggest that,for patients with mild motordysfunction,the enhanced connection between distant fran tal areas may serve as a compensate mechanism toensure the global eficiency across the network This study demonstrates that topological properties of the frontalnetwork under RS can predict the motar functin of stroke patients to some extent,and highlightsthe clinicalpracticability of RS in stroke.The clinical trial registration number is ChicTR200040137. | Jinyan Sun Dan Wang Sisi Chen Richong Pang Hua Liu Jie Wang Yuting Zhang Congxiao Wang Aoran Yang | 2021 | Medicine in Novel Technology and Devices2021，，3： | 0 |
| 11 | TDF Promotes Glycolysis and Mitochondrial Dysfunction to Accelerate Lactate Accumulation by Downregulating PGC1α in Mice显示文摘Tenofovir disoproxil fumarate(TDF),is a product of tenofovir and has been recommended for long-term use by guidelines1 because of its favorable efficacy in the treatment of human immunodeficiency virus(HIV)and hepatitis B virus(HBV)infection.Hence,a better understanding of the safety profiles of long-term TDF use is extremely important.Lactic acidosis,as a rare but fatal adverse event of TDF,were reported both in HIV-infected patients,2-4 and in CHB patients.5-7 Hyperlactatemia occurred in 15.6%HIV-infected patients using TDF in a Cameroon cohort study8 and was 3%in another South Africa cohort study.9 Therefore,TDF increases the risk of abnormal serum lactate,but the mechanism is unclear. | Yuxuan Luo Zhiwei Chen Zhao Li Aoran Luo Yi Zeng Min Chen Mingli Peng Hong Ren Peng Hu | 2023 | Journal of Clinical and Translational Hepatology2023，11，4： | 0 |
| 12 | Mechanical responses of anchoring structure under triaxial cyclic loading显示文摘Dynamic load on anchoring structures(AS)within deep roadways can result in cumulative damage and failure.This study develops an experimental device designed to test AS under triaxial loads.The device enables the investigation of the mechanical response,failure mode,instability assessment criteria,and anchorage effect of AS subjected to combined cyclic dynamic-static triaxial stress paths.The results show that the peak bearing strength is positively correlated with the anchoring matrix strength,anchorage length,and edgewise compressive strength.The bearing capacity decreases significantly when the anchorage direction is severely inclined.The free face failure modes are typically transverse cracking,concave fracturing,V-shaped slipping and detachment,and spallation detachment.Besides,when the anchoring matrix strength and the anchorage length decrease while the edgewise compressive strength,loading rate,and anchorage inclination angle increase,the failure intensity rises.Instability is determined by a negative tangent modulus of the displacement-strength curve or the continued deformation increase against the general downward trend.Under cyclic loads,the driving force that breaks the rock mass along the normal vector and the rigidity of the AS are the two factors that determine roadway stability.Finally,a control measure for surrounding rock stability is proposed to reduce the internal driving force via a pressure relief method and improve the rigidity of the AS by full-length anchorage and grouting modification. | Peng Wang Nong Zhang Qun Wei Xingliang Xu Guangzhen Cui Aoran Li Sen Yang Jiaguang Kan | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，2： | 0 |
| 13 | An Improved Distributed Query for Large-Scale RDF Data显示文摘The rigid structure of the traditional relational database leads to data redundancy,which seriously affects the efficiency of the data query and cannot effectively manage massive data.To solve this problem,we use distributed storage and parallel computing technology to query RDF data.In order to achieve efficient storage and retrieval of large-scale RDF data,we combine the respective advantage of the storage model of the relational database and the distributed query.To overcome the disadvantages of storing and querying RDF data,we design and implement a breadth-first path search algorithm based on the keyword query on a distributed platform.We conduct the LUBM query statements respectively with the selected data sets.In experiments,we compare query response time in different conditions to evaluate the feasibility and correctness of our approaches.The results show that the proposed scheme can reduce the storage cost and improve query efficiency. | Aoran Li Xinmeng Wang Xueliang Wang Bohan Li | 2020 | Journal on Big Data2020，2，4： | 0 |
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