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Tailoring Morphology of PVDF-HFP Membrane via One-step Reactive Vapor Induced Phase Separation for Efficient Oil-Water Separation

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Chinese Journal of Polymer Science 2021年第5期39卷 610-619,I0007页

作者： peng Huo Cheng-Tang Zhong xiao-peng Xiong Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China

Poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)receives increasing attention in membrane separation field based on its advantages such as high mechanical strength,thermal and chemical ***,controlling the microporous structure is still *** this work,we attempted to tailor the morphology of PVDF-HFP membrane via a one-step reactive vapor induced phase separation ***,PVDF-HFP was dissolved in a volatile solvent and then was cast in an ammonia water vapor *** complete evaporation of solvent,membranes with adjustable porous structure were prepared,and the microstructures of the membranes were analyzed by scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy and X-ray diffraction *** on the results,a mechanism of dehydrofluorination induced cross-linking of PVDF-HFP has been suggested to understand the morphology *** our knowledge,this is the first report of one-step reactive vapor induced phase separation strategy to tailor morphology of PVDF-HFP *** addition,the membranes prepared in the ammonia water vapor exhibited enhanced mechanical strength and achieved satisfactory separation efficiency for water-in-oil emulsions,suggesting promising potential.

关键词： PVDF-HFP Membrane Tailoring Vapor induced phase separation Oil-water separation

Quantitative assessment of the impact of earthquakeinduced geohazards on natural landscapes in Jiuzhaigou Valley

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Journal of Mountain Science 2019年第2期16卷 441-452页

作者： HU Xu-dong HU Kai-heng ZHANG xiao-peng WEI Li TANG Jin-bo Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

Many natural landscapes that lie in high mountain regions are highly susceptible to geological hazards, and their values and integrity are strongly threatened by the hazards. A preliminary framework was proposed to undertake a quantitative assessment of the impact of earthquake-induced geological hazards on the natural landscapes. Four factors reflecting the aesthetic value, ecological value, integrity of landscapes were selected to assess their vulnerability. The impact of earthquake-induced geological hazards on the landscapes is quantitatively expressed as the product of their vulnerability and resilience. The assessment framework was applied to Jiuzhaigou Valley which was severely struck by the Ms 7.0 earthquake on August 8, 2017. Field survey, satellite image interpretation, high-resolution DEM and unmanned aerial vehicle(UAV) reconnaissance were used to retrieve the values of the assessment factors. Twenty seven World Heritage Sites in the valley strongly influenced by the earthquakeinduced geohazards were evaluated. The impact values of two sites of them(Sparking Lake and Nuorilang Waterfall) are up to 8.24 and 4.65, respectively, and their natural landscapes were greatly damaged. The assessment results show a good agreement with the actual damages of the heritage sites.

关键词： Natural landscapes assessment Jiuzhaigou earthquake Earthquake-induced geohazards World Heritage Sites

Laparoscopy-assisted gastrectomy for advanced gastric cancer patients with situs inversus totalis: Two case reports and review of literature

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World Journal of Gastrointestinal Surgery 2023年第9期15卷 2063-2073页

作者： Hong-bo Liu xiao-peng Cai Zhao Lu Bin Xiong Chun-Wei peng Department of Gastrointestinal Surgery Hubei Key Laboratory of Tumor Biological Behaviors&Hubei Cancer Clinical Study CenterWuhan Peritoneal Cancer Clinical Medical CenterZhongnan Hospital of Wuhan UniversityWuhan 430070Hubei ProvinceChina School of Nursing Wuhan UniversityWuhan 430070Hubei ProvinceChina

BACKGROUND Situs inversus totalis(SIT)is a rare condition in which the positions of abdominal and thoracic organs present a“mirror image”of the normal ones in the median sagittal *** minimally invasive surgery has evolved to achieve laparoscopic gastrectomy for gastric cancer(GC)patients with SIT,it is difficult to perform lymphadenectomy(LND)in such a transposed anatomical ***,we report the cases of two patients with SIT who successfully underwent laparoscopy-assisted gastrectomy(LAG)with D2 *** SUMMARY Case 1:A 65-year-old man was admitted for intermittent abdominal pain and distension,occasional belching,and acid reflux for 4 *** was diagnosed with GC(cT3N1-2M0)with *** surgery,he had undergone four cycles of neoadjuvant chemotherapy and ***,the patient was evaluated as having a partial response,and laparoscopy-assisted distal gastrectomy with D2 LND and Billroth II reconstruction were *** operation was performed successfully within 240 min with an estimated blood loss of 50 mL and no severe *** patient was discharged on postoperative day(POD)*** 2:A 55-year-old man was admitted for upper abdominal distension with pain and discomfort after eating for 3 *** was diagnosed with GC(cT3N1M0)with *** had a history of hypertension for more than 10 years;however,his blood pressure was well-controlled via regular *** performed laparoscopy-assisted total gastrectomy with D2 LND and Roux-en-Y *** operation was performed successfully within 168 min with an estimated blood loss of 50 mL and no severe *** patient was discharged on POD *** LAG with D2 LND could be considered an accessible,safe,and curative procedure for advanced GC patients with SIT.

关键词： Situs inversus totalis Laparoscopy-assisted gastrectomy Advanced gastric cancer Surgery modality Lymphadenectomy Case report

Percutaneous drainage in the treatment of intrahepatic pancreatic pseudocyst with Budd-Chiari syndrome:A case report

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World Journal of Clinical Cases 2021年第28期9卷 8476-8481页

作者： Gang Zhu Yi-Sheng peng Cheng Fang xiao-Li Yang bo Li Department of General Surgery(Hepatobiliary Surgery) Academician(Expert)Workstation of Sichuan ProvinceThe Affiliated Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina

BACKGROUND Intrahepatic pancreatic pseudocyst(IHPP)is an extremely rare complication of acute pancreatitis,with only a few cases previously described in the *** the best of our knowledge,IHPP with Budd-Chiari syndrome(BCS)has not yet been *** SUMMARY A 35-year-old male presented with abdominal pain,vomiting and anorexia,followed by severe swelling of the lower body after 4 *** morphological assessment(using computed tomography revealed the presence of a huge cyst of 18.28 cm×10.34 cm under the liver capsule accompanied by a large amount of *** puncture allowed us to detect a high level of amylase in the collection,confirming the diagnosis of *** cyst was treated by percu-taneous drainage,producing complete resolution of the *** IHPP can be treated with percutaneous drainage,endoscopic drainage,surgery or even conservative treatment,depending on the specific *** recommend percutaneous drainage as the first choice of treatment when IHPP with secondary BCS.

关键词： Intrahepatic pancreatic pseudocyst Pancreatic pseudocyst Pancreatitis Budd�Chiari syndrome Percutaneous drainage Case report

A voltage support control strategy based on three-port flexible multi-state switch in distribution networks

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Plasma Science and Technology 2020年第8期22卷 192-202页

作者： bo peng Guorong ZHANG School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009People's Republic of China

Voltage sags in power system may lead to serious problems such as the off-grid of distributed generation and electrical equipment *** a novel type of power electronic equipment,a flexible multi-state switch(FMSS)is capable to support the voltage during the grid *** this paper,a voltage control strategy to support the voltage in a distribution network is proposed by introducing three-port *** positive-negative-sequence compensation(PNSC)scheme is adopted to control the active and reactive *** control scheme eliminates active power oscillations at the port of voltage sags and reduces coupling oscillations of other *** on the characteristics of the voltage support under PNSC scheme,two voltage support strategies are proposed.A proportional-integral controller is introduced to provide the reactive power references,which eliminates the errors when estimating the grid voltage and impedance.A current limiting scheme is adopted to keep the port current in a safe range by adjusting the active and reactive power *** voltage support strategies in two different voltage sags are simulated,and results show the feasibility and effectiveness of the proposed control strategies.

关键词： flexible multi-state switch voltage support low-voltage ride-through reactive power control

Application of the cortical bone trajectory technique in posterior lumbar fixation

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World Journal of Clinical Cases 2023年第2期11卷 255-267页

作者： Shi-bo peng Xi-Chuan Yuan Wei-Zhong Lu Ke-xiao Yu Department of Orthopedics Chongqing Nanchuan Hospital of Traditional Chinese MedicineChongqing 408400China Department of Orthopedics Chongqing Hospital of Traditional Chinese MedicineChongqing 400021China

The cortical bone trajectory(CBT) is a novel technique in lumbar fixation and *** unique caudocephalad and medial-lateral screw trajectories endow it with excellent screw purchase for vertebral fixation via a minimally invasive *** combined use of CBT screws with transforaminal or posterior lumbar interbody fusion can treat a variety of lumbar diseases,including spondylolisthesis or stenosis,and can also be used as a remedy for revision surgery when the pedicle screw *** has obvious advantages in terms of surgical trauma,postoperative recovery,prevention and treatment of adjacent vertebral disease,and the surgical treatment of obese and osteoporosis ***,the concept of CBT internal fixation technology appeared relatively recently;consequently,there are few relevant clinical studies,and the long-term clinical efficacy and related complications have not been ***,large sample and prospective studies are needed to further reveal the long-term complications and fusion *** a supplement to the traditional pedicle trajectory fixation technique,the CBT technique is a good choice for the treatment of lumbar diseases with accurate screw placement and strict indications and is thus deserving of clinical recommendation.

关键词： Cortical bone trajectory Management of midle line fusion Lumbar interbody fusion Lumbar surgery Review

Event-Triggered Control for Multi-Agent Systems:Event Mechanisms for Information Transmission and Controller Update

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Journal of Systems Science & Complexity 2022年第3期35卷 953-972页

作者： LIU Pin xiao Feng WEI bo State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Control and Computer Engineering North China Electric Power UniversityBeijing 102206China

This paper investigates the state consensus of linear multi-agent systems in a graph where each agent is equipped with two novel event-triggering *** agent utilizes them to avoid continuous information transmissions with its neighbors and to reduce the frequencies of controller updates,*** of the event-triggering mechanisms defines a threshold of state errors by a constant plus a state-dependent *** other event-triggering mechanism introduces a period of rest time after each *** each agent,both event-triggering mechanisms are fully distributed and are independent of any global *** authors utilize a co-design approach to deal with the interplay between control gains and parameters in event-triggering *** appropriate control gains in control laws and parameters in event-triggering conditions,subsystems employing discrete-time signals from neighbors and discrete-time signals from their controllers achieve the state *** are performed to illustrate the effectiveness of the proposed event-triggering mechanisms.

关键词： Consensus control event-triggering mechanism multi-agent systems output feedback

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Effects of process parameters on morphology and distribution of externally solidified crystals in microstructure of magnesium alloy die castings

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China Foundry 2018年第2期15卷 139-144页

作者： Meng-wu Wu xiao-bo Li Zhi-peng Guo Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology School of Materials Science and Engineering Tsinghua University

During the cold-chamber high pressure die casting(HPDC) process, samples were produced to investigate the microstructure characteristics of AM60B magnesium alloy. Special attention was paid to the effects of process parameters on the morphology and distribution of externally solidified crystals(ESCs) in the microstructure of magnesium alloy die castings, such as slow shot phase plunger velocity, delay time of pouring and fast shot phase plunger velocity. On the basis of metallographic observation and quantitative statistics, it is concluded that a lower slow shot phase plunger velocity and a longer delay time of pouring both lead to an increment of the size and percentage of the ESCs, due to the fact that a longer holding time of the melt in the shot sleeve will cause a more severe loss of the superheat. The impingement of the melt flow on the ESCs is more intensive with a higher fast shot phase plunger velocity, in such case the ESCs reveal a more granular and roundish morphology and are dispersed throughout the cross section of the castings. Based on analysis of the filling and solidification processes of the melt during the HPDC process, reasonable explanations were proposed in terms of the nucleation, growth, remelting and fragmentation of the ESCs to interpret the effects of process parameters on the morphology and distribution of the ESCs in the microstructure of magnesium alloy die castings.

关键词： magnesium alloy high pressure die casting microstructure externally solidified crystals process parameters

A Novel Competition-Based Coordination Model With Dynamic Feedback for Multi-Robot Systems

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IEEE/CAA Journal of Automatica Sinica 2023年第10期10卷 2029-2031页

作者： bo peng Xuerui Zhang Mingsheng Shang Chongqing Key Laboratory of Big Data and Intelligent Computing Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714 Chongqing School University of Chinese Academy of SciencesChongqing 400714China Chongqing Key Laboratory of Big Data and Intelligent Computing Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China

Dear Editor, Task allocation strategies are important in multi-robot systems and have been intensely investigated by researchers because they are critical in determining the performance of the system. In this letter, a novel competition-based coordination model is proposed to solve the multi-robot task allocation problem and applied to a multi-robot object tracking scenario.

关键词： robot Robot Dynamic