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Multiple hidden vessels in walled-off necrosis with high-risk bleeding: Report of two cases

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World Journal of Clinical Cases 2021年第27期9卷 8214-8219页

作者： ning Xu Ya-Qi Zhai long-Song Li ning-Li Chai Department of Gastroenterology and Hepatology Chinese PLA General HospitalBeijing 100853China

BACKGROUND Walled-off necrosis(WON),as a local complication of acute necrotizing pancreatitis,is difficult to differentiate from pancreatic pseudocysts(PPC).Imaging modalities such as computed tomography show a lower accuracy than endoscopic ultrasound(EUS)in confirming the ***-guided cystogastrostomy following direct endoscopic necrosectomy has achieved excellent results and has been regarded as a preferred alternative to traditional ***,highrisk bleeding is one of the greatest *** SUMMARY Two patients with symptomatic pancreatic fluid collections(PFCs)were admitted to our hospital for EUS-guided lumen-apposing metal stent *** female patient suffered from intermittent abdominal pain and underwent two perioperative CT *** male patient had recurrent pancreatitis and showed a growing *** initial diagnosis was a PPC according to contrast-enhanced ***,the evidence of solid contents on EUS prompted revision of the diagnosis to *** endoscope was inserted into the cavity,and some necrotic debris and multiple hidden vascular structures were *** to conservative treatment by irrigation with sterile water instead of direct necrosectomy,we successfully avoided damaging hidden vessels and reduced the risk of intraoperative *** The application of EUS is helpful for the identification of *** intervention should be conducted for WON with multiple vessels to prevent bleeding.

关键词： Walled-off necrosis Computed tomography Endoscopic ultrasound Vessel bleeding Case report

Production of 5-Hydroxymethylfurfural and Furfural from Lignocellulosic Biomass in Water-Tetrahydrofuran Media with Sodium Bisulfate

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Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： ning Shi Qi-ying Liu Tie-jun Wang Qi Zhang long-long Ma Chi-liu Cai CAS Key Laboratory of Renewable Energy4 Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 ChinaSchool of Chemical Engineering Guizhou Institute of Technology Guiyang 550003 China CAS Key Laboratory of Renewable Energy4 Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China

5-Hydroxymethylfurfural (HMF) and furfural (FF), two bio-based platform chemicals, were produced from various raw lignocellulosic materials (corncob, corn stover, wheat straw, rice straw and sugarcane bagasse) in a water-tetrahydrofuran media by using NaHSO4 as catalyst. The influences of reaction temperature (160–200 °C), reaction time (30–120 min), solvent volume ratio, feedstock concentration (2.4wt%–11.1wt%) and catalyst dosage were studied. The highest HMF and FF yields obtained from corncob were 47mol% and 56mol% under condition of 190 °C, 90 min, 10/1 of THF/H2O. Besides, the lignin in the raw biomass was also depolymerized into organosolv lignin.

关键词： 5-Hydroxymethylfurfural Furfural Lignocellulosic biomass Hydrolysis Dehydration Tetrahydrofuran Sodium bisulfate

Hydrodynamic performance of flexible risers subject to vortex-induced vibrations

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Journal of Hydrodynamics 2013年第1期25卷 156-164页

作者： ZHANG Hui YANG Jian-min XIAO long-fei LU Hai-ning State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

The Vortex-Induced Vibration （VIV） displacements are determined from both the measured accelerations and strains in a series of VIV experiments. Based on the results, the forces in the longitudinal, transversal and tangential directions are estimated by using the finite element method with and without considering the interactions between adjacent elements. The numerical simulation indicates that the method considering the interactions performs better in the estimation of the forces. The component of the transversal force in phase with the acceleration is associated with the added mass coefficient. The estimated added mass coefficients take abnormally high values at the locations where the displacements are small. An improved formula based on the L＇Hospital＇s rule is pro- posed to deal with this problem. The results show the advantage of this formula in estimating the added mass coefficients at the loca- tions with small VIV displacements.

关键词： Vortex-Induced Vibration (VIV) flexible risers hydrodynamic force added mass coefficient

Modelling the performance of EPB shield tunnelling using machine and deep learning algorithms

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Geoscience Frontiers 2021年第5期12卷 81-92页

作者： Song-Shun Lin Shui-long Shen ning Zhang Annan Zhou Department of Civil Engineering School of Naval ArchitectureOceanand Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China MOE Key Laboratory of Intelligent Manufacturing Technology College of EngineeringShantou UniversityShantouGuangdong 515063China Discipline of Civil and Infrastructure School of EngineeringRoyal Melbourne Institute of Technology(RMIT)Victoria 3001Australia Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Shanghai Jiao Tong UniversityShanghai 200240China

This paper introduces an intelligent framework for predicting the advancing speed during earth pressure balance(EPB)shield *** artificial intelligence(AI)models based on machine and deep learning techniques-back-propagation neural network(BPNN),extreme learning machine(ELM),support vector machine(SVM),long-short term memory(LSTM),and gated recurrent unit(GRU)-are *** geological and nine operational parameters that influence the advancing speed are considered.A field case of shield tunnelling in Shenzhen City,China is analyzed using the developed models.A total of 1000 field datasets are adopted to establish intelligent *** prediction performance of the five models is ranked as GRU>LSTM>SVM>ELM>***,the Pearson correlation coefficient(PCC)is adopted for sensitivity *** results reveal that the main thrust(MT),penetration(P),foam volume(FV),and grouting volume(GV)have strong correlations with advancing speed(AS).An empirical formula is constructed based on the high-correlation influential factors and their corresponding field ***,the prediction performances of the intelligent models and the empirical method are *** results reveal that all the intelligent models perform better than the empirical method.

关键词： EPB shield machine Advancing speed prediction Intelligent models Empirical analysis Tunnel excavation

Itch perception is reflected by neuronal ignition in the primary somatosensory cortex

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National Science Review 2022年第6期9卷 90-99页

作者： Xiao-Jun Chen Yan-He Liu ning-long Xu Yan-Gang Sun Institute of Neuroscience State Key Laboratory of Neuroscience Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of Sciences University of Chinese Academy of Sciences Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology

Multiple cortical areas including the primary somatosensory cortex(S1) are activated during itch signal processing, yet cortical representation of itch perception remains unknown. Using novel miniature two-photon microscopic imaging in free-moving mice, we investigated the coding of itch perception in *** found that pharmacological inactivation of S1 abolished itch-induced scratching behavior, and the itch-induced scratching behavior could be well predicted by the activity of a fraction of layer 2/3 pyramidal neurons, suggesting that a subpopulation of S1 pyramidal neurons encoded itch perception, as indicated by immediate subsequent scratching behaviors. With a newly established optogenetics-based paradigm that allows precisely controlled pruritic stimulation, we found that a small fraction of S1 neurons exhibited an ignition-like pattern at the detection threshold of itch perception. Our study revealed the neural mechanism underlying itch perceptual coding in S1, thus paving the way for the study of cortical representation of itch perception at the single-neuron level in freely moving animals.

关键词： itch perception primary somatosensory cortex miniature two-photon microscopic imaging

pH Induced Self-assembly of AIE Fluorescent Probe for Tumor Imaging

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Chinese Journal of Polymer Science 2024年第1期42卷 7-13,I0005页

作者： Jing-Yuan Xiang Wen-long Zhang He-Ting Li Ya-ning He Department of Chemical Engineering Key Laboratory of Advanced Materials(MOE)Tsinghua UniversityBejing 100084China

This work reported an AIE fluorescent probe for tumor imaging based on the p H induced self-assembly strategy. The fluorescent probe was composed of an acid-responsive soluble copolymer PEG-b-PAMA-DMMA with a maleic acid amide group and an anionic soluble aggregation-induced emission fluorogen(AIEgen) TPE-2SO_(3)^(-). The polymer could be transformed into a protonated amine-containing polymer after the hydrolysis of maleic acid amide in acidic tumor microenvironment, which would be further self-assembled with TPE-2SO_(3)^(-)to form aggregated nanoparticles. The transition of TPE-2SO_(3)^(-)from dispersed state to aggregated state led to an obvious increase in fluorescence intensity due to its AIE characteristics.

关键词： p H-responsive Self-assembly Fluorescent probe AIE Tumor imaging

Texture development of mesophase in reservoir pyrobitumen and the temperature-pressure converting of the gas reservoir in the Chuanzhong Uplift, Southwestern China

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Petroleum Science 2023年第2期20卷 721-732页

作者： Cheng-Yu Yang Mei-Jun Li Tie-Guan Wang ning-ning Zhong Rong-Hui Fang long Wen State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Oil&Gas Survey China Geological SurveyBeijing100083China The Key Laboratory of Unconventional Petroleum Geology China Geological SurveyBeijing100083China Exploration and Development Research Institute of Southwest Oil&Gasfield Company PetroChinaChengduSichuan610041China

The Neoproterozoic-Lower Paleozoic dolostone gas reservoirs in the Chuanzhong Uplift in Southwestern China contain the mesophase pyrobitumen (pyrobitumen with mesophase). The mesophase in the pyrobitumen is mostly composed of a mixture of condensed macromolecule polycyclic aromatic hydrocarbons (PAH), and has been mostly converted to various grain, flow, and domain textures. The volcanic activity nearby the Chuanzhong Uplift may have generated very hot (over 300 °C) hydrothermal fluid, with migration of the fluid into the dolostone reservoir transforming the hydrocarbons in the reservoir into an anisotropic carbon by-product, which formed under high temperature and pressure conditions;over 300 °C and 200 MPa according to fluid inclusion analysis. The high temperature-pressure in reservoir was caused by sudden devolatilization of the hydrocarbons due to hydrothermal heating, which formed the unusual texture of the mesophase. The elliptical mesophase grains (EG), the honeycomb structure of pyrobitumen, and the occurrence of polarized classes of mesophase in single pyrobitumen deposits are all unusual textures. This study investigates the texture development of this pressure-affected pyrobitumen. Observation and study of the mesophase suggest that the class of mesophase in pyrobitumen is determined by temperature, while pressure (assessed from associated fluid inclusions) significantly affected the texture. Analysis of the texture of the pyrobitumen in conjunction with previous thermometry results from methane inclusions suggests that the high class mesophase of the pyrobitumen could be applied as a temperature indicator for geological conditions. Furthermore, the unusual textures of the pyrobitumen including elliptical mesophase grains (EG), the honeycomb structure of pyrobitumen, and the occurrence of polarized classes of mesophase in single pyrobitumen could reflect the abnormal high formation pressure.

关键词： Pyrobitumen Mesophase Optical texture Pressure affect Oil reservoir Chuanzhong Uplift

Fault-tolerant decentralized H-infinity control for multi-channel systems using homotopy method

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控制理论与应用（英文版） 2007年第1期5卷 77-82页

作者： ning CHEN Weihua gui Masao IKEDA School of Information Science ＆ Engineering Central South University Changsha Hunan 410083 China Graduate School of Engineering Osaka University Suita Osaka 565-0871 Japan

This paper considers a fault-tolerant decentralized H-infinity control problem for multi-channel linear time-invariant systems. The purpose is to design a decentralized H-infinity output feedback controller *** the given system and achieve a certain H-infinity performance requirement both in the normal situation and in the situation where any one of the local controllers fails. The designed problem is reduced to a feasibility problem of a set of bilinear matrix inequalities （BMIs）. An algorithm is proposed to solve the BMIs. First, the normal situation is considered where all the local controllers are functioning. The local controllers are obtained from a standard centralized H-infinity controller by using a homotopy method imposing a structural constraint progressively. Secondly, the above case is extended to the one where any one of the local controllers fails. We again use a homotopy method where the coefficient matrices of the failed controller are decreased progressively to zero. The efficiency of the proposed algorithm is demonstrated by an example.

关键词： Decentralized control H-infinity control Fault-tolerant Control BMI Homotopy method

Adsorption-oxidation of hydrogen sulfide on Fe/walnut-shell activated carbon surface modified by NH_3-plasma

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Journal of Environmental Sciences 2018年第2期30卷 216-226页

作者： Ping ning Sijian Liu Chi Wang Kai Li Xin Sun Lihong Tang gui Liu Faculty of Environmental Science and Engineering Kunming University of Science and Technology Faculty of Chemical Engineering Kunming University of Science and Technology

Walnut-shell activated carbon（WSAC） supported ferric oxide was modified by non-thermal plasma（NTP）, and the removal efficiency for hydrogen sulfide over Fe/WSAC modified by dielectric barrier discharge（DBD） was significantly promoted. The sample modified for10 min and 6.8 k V output（30 V input voltage） maintained 100% H2 S conversion over a long reaction time of 390 min. The surface properties of adsorbents modified by NTP under different conditions were evaluated by the methods of X-ray photoelectron spectroscopy（XPS）, Brunauer–Emmett–Teller（BET） analysis and in-situ Fourier transform infrared spectroscopy（FTIR）, to help understand the effect of the NTP treatment. NTP treatment enhanced the adsorption capacity of Fe/WSAC, which could due to the formation of micro-pores with sizes of0.4, 0.5 and 0.75 nm. XPS revealed that chemisorbed oxygen changed into lattice oxygen after NTP treatment, and lattice oxygen is beneficial for H2 S oxidation. From the in-situ FTIR result,transformation of the reaction path on Fe/WSAC was observed after NTP modification. The research results indicate that NTP is an effective method to improve the surface properties of the Fe/WSAC catalyst for H2 S adsorption-oxidation.

关键词： Dielectric barrier discharge Non-thermal plasma Surface modification Hydrogen sulfide Fe/walnut-shell activated carbon(Fe/WSAC)