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Elucidation of thermally induced internal porosity in zinc oxide nanorods

Nano Research 2018年第5期11卷 2412-2423页

作者： Albertus D. Handoko Laura-Lynn Liew ming Lin Gopinathan Sankar Yonghua Du Haibin Su Zhili Dong Gregory K. L. goh Institute of Materials Research and Engineering Agency for Science Technology and Research (A＊STAR) Singapore 138634 Singapore School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Chemistry University College London London WC1H0AJ UK Institute of Chemical and Engineering Sciences Agency for Science Technology and Research (A＊STAR) Singapore 627833 Singapore

In situ electron microscopy, tomography, photoluminescence, and X-ray absorption spectroscopy were utilized to monitor and explain the formation and growth of internal pores within ZnO nanorods. Careful examination using electron microscopy and tomography indicate that nanosized intemal pores start appearing within the individual solution-grown ZnO nanorods upon exposure to 200 ℃. The pore volume growth rate is proportional to the heat treatment time, indicating that the process is diffusion controlled, akin to a reverse Ostwald ripening-like process. A manageable pore growth rate of 1.4-4.4 nm^3·min^-1 was observed at 540 ℃, suggesting that the effective control over internal porosity can be achieved by carefully controlling the heat-treatment profile. Mechanistic studies using X-ray absorption spectroscopy indicated that the pore formation is linked to the significant reduction of the number of zinc vacancies after heat treatment. An optimum condition exists where most of the native surface defects are removed, while the bulk defects are contained within the internal pores. It is also demonstrated that the internal porosity can be exploited to improve the visible light absorption of ZnO. A combination of the lower defect density and improved light absorption of the heat-treated ZnO films thus lead to an increase in the photo- electrochemical response of more than 20× compared to that of the as-grown ZnO.

关键词： zinc oxide solution growth hydrothermal porosity photocatalysis photocurrent

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草酸在国外防治蜜蜂狄斯瓦螨中的应用

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中国蜂业 2024年第8期75卷 58-62页

作者：杨婷胡敏李娜马川资源昆虫高效养殖与利用全国重点实验室中国农业科学院蜜蜂研究所山西农业大学植物保护学院

狄斯瓦螨(Varroa destructor)是威胁蜂群健康的主要因素之一，对全球养蜂业造成了巨大损失。长期使用合成类杀螨剂会增加狄斯瓦螨抗药性和蜂产品污染风险，而草酸作为一种植物来源的天然化合物，在狄斯瓦螨防治中具有安全高效、无残留... 详细信息

狄斯瓦螨(Varroa destructor)是威胁蜂群健康的主要因素之一，对全球养蜂业造成了巨大损失。长期使用合成类杀螨剂会增加狄斯瓦螨抗药性和蜂产品污染风险，而草酸作为一种植物来源的天然化合物，在狄斯瓦螨防治中具有安全高效、无残留、不易产生抗性等优势，在国外广泛使用。本文从草酸性质、使用方法、防治效果和安全性等方面进行论述，深化草酸治螨的认识，为其在我国蜂产业中的推广应用提供指导。

关键词：蜜蜂狄斯瓦螨草酸

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Hierarchical AgAu alloy nanostructures for highly efficient electrocatalytic ethanol oxidation

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Chinese Journal of Catalysis 2022年第3期43卷 851-861页

作者： Caiqin Wang Danil Bukhvalov M.Cynthia goh Yukou Du Xiaofei Yang College of Science&Institute of Materials Physics and Chemistry Nanjing Forestry UniversityNanjing 210037JiangsuChina Department of Chemistry University of TorontoTorontoCanada College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123JiangsuChina

The ethanol oxidation reaction is a significant anodic reaction for direct alcohol fuel *** most commonly used catalysts for this reaction are Pt‐based materials;however,Pt‐based electrocatalysts cause carbon monoxide poisoning with intermediates before the complete transformation of alcohol to CO_(2).Herein,we present hierarchical AgAu bimetallic nanoarchitectures for ethanol electrooxidation,which were fabricated via a partial galvanic reduction reaction between Ag and HAuCl_(4).The ethanol electrooxidation performance of the optimal AgAu nanohybrid was increased to 1834 mA mg^(‒1),which is almost 10 times higher than that of the pristine Au catalyst(190 mA mg^(‒1))in alkaline *** was achieved by introducing Ag into the Au catalyst and controlling the time of the replacement *** heterostructure also presents a higher current density than that of commercial Pt/C(1574 mA mg^(‒1)).Density functional theory calculations revealed that the enhanced activity and stability may stem from unavoidable defects on the surface of the integrated AgAu *** oxidation reactions over these defects are more energetically favorable,which facilitates the oxidative removal of carbonaceous poison and boosts the combination with radicals on adjacent Au active sites.

关键词： AgAu nanohybrids Hierarchical nanostructures Defected surface DFT calculation Ethanol electrooxidation

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Melittin, the Major Pain-Producing Substance of bee Venom

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Neuroscience Bulletin 2016年第3期32卷 265-272页

作者： Jun Chen Su-min Guan Wei Sun Han Fu Institute for Biomedical Sciences of Pain Tangdu HospitalThe Fourth Military Medical University Xi'an 710038China Key Laboratory of Brain Stress and Behavior PLAXi'an 710038 China Beijing Institute for Brain Disorders Beijing 100069 China School of Stomatology The Fourth Military Medical University Xi'an 710032 China

Melittin is a basic 26-amino-acid polypeptide that constitutes 40-60% of dry honeybee（Apis mellifera）*** much is known about its strong surface activity on lipid membranes,less is known about its painproducing effects in the nervous *** this review,we provide lines of accumulating evidence to support the hypothesis that melittin is the major pain-producing substance of bee *** the psychophysical and behavioral levels,subcutaneous injection of melittin causes tonic pain sensation and pain-related behaviors in both humans and *** the cellular level,melittin activates primary nociceptor cells through direct and indirect *** one hand,melittin can selectively open thermal nociceptor transient receptor potential vanilloid receptor channels via phospholipase A2-lipoxygenase/cyclooxygenase metabolites,leading to depolarization of primary nociceptor *** the other hand,algogens and inflammatory/proinflammatory mediators released from the tissue matrix by melittin＇s pore-forming effects can activate primary nociceptor cells through both ligand-gated receptor channels and the G-protein-coupled receptor-mediated opening of transient receptor potential canonical ***,subcutaneous melittin up-regulates Nav1.8 and Nav1.9subunits,resulting in the enhancement of tetrodotoxinresistant Na~＋currents and the generation of long-term action potential *** nociceptive responses in the periphery finally activate and sensitize the spinal dorsal horn pain-signaling neurons,resulting in spontaneous nociceptive paw flinches and pain hypersensitivity to thermal and mechanical *** together,it is concluded that melittin is the major pain-producing substance of bee venom,by which peripheral persistent pain and hyperalgesia（or allodynia）,primary nociceptive neuronal sensitization,and CNS synaptic plasticity（or metaplasticity） can be readily induced and the molecular and cellular mechanisms underlying naturally-occurring venomous

关键词： Melittin Algogen - Nociceptor Spinaldorsal horn Pain

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Critical evaluation of contemporary management in a new Pelvic Exenteration Unit: The first 25 consecutive cases

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World Journal of Gastrointestinal Oncology 2017年第5期9卷 218-227页

作者： min Hoe Chew Yu-Ting Yeh Ee-Lin Toh Stephen Aditya Sumarli Ghee Kheng Chew Lui Shiong Lee Mann Hong Tan Tiffany Priyanthi Hennedige Shin Yi Ng Say Kiat Lee Tze Tec Chong Hairil Rizal Abdullah Terence Lin Hon goh Mohamed Zulfikar Rasheed Kok Chai Tan Choong Leong Tang Department of Colorectal Surgery Singapore General Hospital Department of Obstetrics and Gynaecology Singapore General Hospital Department of Urology Singapore General Hospital Department of Orthopaedic Surgery Singapore General Hospital Division of Oncological Imaging National Cancer Centre Singapore Department of Anaesthesiology Singapore General Hospital Vascular Surgery Singapore General Hospital Department of Plastic Reconstructive and Aesthetic SurgerySingapore General Hospital

To critically appraise short-term outcomes in patients treated in a new Pelvic Exenteration (PE) Unit. METHODSThis retrospective observational study was conducted by analysing prospectively collected data for the first 25 patients (16 males, 9 females) who underwent PE for advanced pelvic tumours in our PE Unit between January 2012 and October 2016. Data evaluated included age, co-morbidities, American Society of Anesthesiologists (ASA) score, Eastern Cooperative Oncology Group (ECOG) status, preoperative adjuvant treatment, intra-operative blood loss, procedural duration, perioperative adverse event, lengths of intensive care unit (ICU) stay and hospital stay, and oncological outcome. Quantitative data were summarized as percentage or median and range, and statistically assessed by the χ2 test or Fisher’s exact test, as applicable. RESULTSAll 25 patients received comprehensive preoperative assessment via our dedicated multidisciplinary team approach. Long-course neoadjuvant chemoradiotherapy was provided, if indicated. The median age of the patients was 61.9-year-old. The median ASA and ECOG scores were 2 and 0, respectively. The indications for PE were locally invasive rectal adenocarcinoma (n = 13), advanced colonic adenocarcinoma (n = 5), recurrent cervical carcinoma (n = 3) and malignant sacral chordoma (n = 3). The procedures comprised 10 total PEs, 4 anterior PEs, 7 posterior PEs and 4 isolated lateral PEs. The median follow-up period was 17.6 mo. The median operative time was 11.5 h. The median volume of blood loss was 3306 mL, and the median volume of red cell transfusion was 1475 mL. The median lengths of ICU stay and of hospital stay were 1 d and 21 d, respectively. There was no case of mortality related to surgery. There were a total of 20 surgical morbidities, which occurred in 12 patients. The majority of the complications were grade 2 Clavien-Dindo. Only 2 patients experienced grade 3 Clavien-Dindo complications, and both required procedura

关键词： Colorectal cancer Advanced pelvic tumour Sacrectomy Oncological outcome Pelvic exenteration Chordoma

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A leakage particle-wall impingement based vibro-acoustic characterization of the leaked sand-gas pipe flow

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Particuology 2021年第2期19卷 84-93页

作者： Kai Wang Yinan Hu min Qin Gang Liu Yichen Li Gang Wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Metering Test Center China Academy of Engineering PhysicsMianyang 621900China

Solid particle leakage detection in double-wall pipes is industrially important,especially in chemical and petroleum ***,we developed vibration and acoustic sensor approaches for the characterization and comparative study of the applicability of leakage sand particle detection from the flow of gas pipes.A specific wideband vibration sensor and pressure-field microphone were selected to identify the vibro-acoustic characteristics within 50 kHz of the particle *** vibro-acoustic time-behaviours and characteristic frequencies of particle leakage were observed by the time-frequency *** leakage gas flow noise was verified by coherence analysis and minimized by a digital bandpass and band-elimination *** experiments were performed,and good agreement was found between the release pressures(0.1-0.3 MPa)with different leak sizes(0-8 mm)under different sand masses(120μm)and vibro-acoustic Root-Mean-Square(RMS)*** the comparison of the two methods,the vibration method has a better frequency response for the leakage flow and is good for identifying whether there are particle *** acoustic method has a time behaviour response and is good for establishing the relationship between the particle mass and *** addition,the acoustic method has frequency shift features with a better signal to noise *** acoustic method lays the foundation for future work of more complex leakage detection combining the advantages of vibration and the acoustic method.

关键词： Solid particle detection Vibration and acoustic Sand-gas flow Pipe leak

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Effectiveness of bee venom acupuncture in alleviating post-stroke shoulder pain: a systematic review and meta-analysis

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Journal of Integrative Medicine 2015年第4期13卷 241-247页

作者： Sung min Lim Sook-Hyun Lee Department of Clinical Research on Rehabilitation Korea National Rehabilitation Research Institute

BACKGROUND：Shoulder pain is a common complication of *** venom acupuncture（BVA）is increasingly used in the treatment of post-stroke shoulder ***：To summarize and evaluate evidence on the effectiveness of BVA in relieving shoulder pain after *** STRATEGY：Nine databases,namely MEDLINE,EMBASE,the Cochrane Library,the China National Knowledge Infrastructure（CNKI）,the Japan Science and Technology Information Aggregator,Electronic（J-STAGE）,and four Korean medical databases,namely,the National Assembly Library,the Research Information Service System,the National Discovery for Science Leaders,and OASIS,were searched from their inception through August 2014 without language *** CRITERIA：Randomized controlled trials（RCTs）were included if BVA was used at acupoints as the sole treatment,or as an adjunct to other treatments,for shoulder pain after *** EXTRACTION AND ANALYSIS：Two review authors independently selected trials for inclusion,assessed methodological quality and extracted ***：A total of 138 potentially relevant articles were identifi ed,4 of which were RCTs that met our inclusion *** quality of studies included was generally low,and a preponderance of positive results was *** four trials reported favorable effects of BVA on shoulder pain after *** RCTs assessing the effects of BVA on post-stroke shoulder pain,as opposed to saline injections,were included in the *** was signifi cantly lower for BVA than for saline injections（standardized mean difference on 10-cm visual analog scale：1.46 cm,95%CI=0.30–2.62,P=0.02,n=86）CONCLUSION：This review provided evidence suggesting that BVA is effective in relieving shoulder pain after ***,further studies are needed to confi rm the role of BVA in alleviating post-stroke shoulder *** studies should be conducted with large samples and rigorous study designs.

关键词： bee venoms acupuncture therapy stroke shoulder pain meta-analysis systematic review

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棕榈油与猪油在组成结构和功能特性上的比较

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中国油脂 2009年第12期34卷 39-44页

作者：吴苏喜季敏吴文民长沙理工大学化学与生物工程学院长沙410004 马来西亚棕榈油总署大马棕榈油技术研发(上海)有限公司上海201108

比较了3种棕榈油和6种猪油产品在理化指标、营养与功能特性指标以及脂肪酸组成及其在甘油三酯Sn-2位上的分布情况,以判断棕榈油对猪油的可替代性。结果表明,棕榈油和猪油的熔点、碘值、酸值、过氧化值等理化指标很接近;棕榈油不含胆固醇... 详细信息

比较了3种棕榈油和6种猪油产品在理化指标、营养与功能特性指标以及脂肪酸组成及其在甘油三酯Sn-2位上的分布情况,以判断棕榈油对猪油的可替代性。结果表明,棕榈油和猪油的熔点、碘值、酸值、过氧化值等理化指标很接近;棕榈油不含胆固醇,具有比猪油较高的VE含量和氧化稳定性;在可塑性方面,精炼棕榈油与猪板油相当,而且好于猪杂油和猪膘油,棕榈硬脂与猪骨油相当,棕榈液油与猪皮油相当;虽然棕榈油和猪油的脂肪酸组成具有相似性,猪油的不饱和脂肪酸含量略高于棕榈油的不饱和脂肪酸含量,但是棕榈油的Sn-2位上主要分布不饱和脂肪酸,而猪油的Sn-2位上主要分布饱和脂肪酸,使棕榈油比猪油更加容易消化吸收。

关键词：棕榈油猪油脂肪酸组成甘油三酯结构功能特性

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道地产区阳春砂仁中华蜜蜂访花行为及携粉特征研究

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环境昆虫学报 2024年第1期46卷 219-226页

作者：李文峰彭烨华张祎刘娓罗佳敏李志刚广东省科学院动物研究所广东省动物保护与资源利用重点实验室广东省野生动物保护与利用公共实验室广州510260 福建农林大学动物科学学院(蜂学学院) 福建福州350002 广东药科大学中药资源学院广东云浮527527

作为我国四大南药之一,阳春砂仁Amomum villosum Lour.具有多重功效和悠久的应用历史。阳春砂仁的道地产区为广东省阳春市及周边地区。长久以来,受制于野生优势传粉昆虫资源匮乏,道地产区阳春砂仁自然结实率低、产量低,已严重影响到当... 详细信息

作为我国四大南药之一,阳春砂仁Amomum villosum Lour.具有多重功效和悠久的应用历史。阳春砂仁的道地产区为广东省阳春市及周边地区。长久以来,受制于野生优势传粉昆虫资源匮乏,道地产区阳春砂仁自然结实率低、产量低,已严重影响到当地相关产业可持续发展。本研究观察道地产区阳春砂仁的开花过程及花朵形态,记录访花昆虫种类,并着重分析了中华蜜蜂的访花行为特点和传粉潜能。观察发现,阳春砂仁花朵形态特征不利于自花传粉及一般昆虫传粉,但其花朵散粉量和泌蜜量均较大而有利于吸引昆虫传粉。本研究共调查到4种访花昆虫,分别为中华蜜蜂Apis cerana cerana Fabr.、黑头酸臭蚁Tapinoma melanocephalum Fabr.、果蝇1种Drosophila sp.和欧洲球螋Forficula auricularia L.,其中,中华蜜蜂是主要访花昆虫。中华蜜蜂存在采粉和采蜜两种采集行为,且存在显著偏好性,其更频繁采集砂仁花蜜(平均占比77.4%),而不是花粉(平均占比22.6%),采粉行为具有潜在传粉功能,而采蜜行为则不具有传粉作用。另外,中华蜜蜂虫体各部位在采集过程中都可能携带花粉,但不同部位携带花粉量不同。中华蜜蜂是道地产区阳春砂仁的主要传粉昆虫,但其采集偏好性降低了对阳春砂仁的传粉效能,通过一定措施提高其采粉行为比率,将可能提高中华蜜蜂对道地产区阳春砂仁的授粉效能。

关键词：阳春砂仁道地产区中华蜜蜂采集行为携粉特征

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A Novel Improved Artificial bee Colony and Blockchain-Based Secure Clustering Routing Scheme for FANET

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China Communications 2021年第7期18卷 103-116页

作者： Liang Zhao Muhammad Bin Saif Ammar Hawbani Geyong min Su Peng Na Lin Shenyang Aerospace University ShenyangLiaoning 110136China University of Science and Technology of China HefeiChina University of Exeter ExeterUK

Flying Ad hoc Network(FANET)has drawn significant consideration due to its rapid advancements and extensive use in civil ***,the characteristics of FANET including high mobility,limited resources,and distributed nature,have posed a new challenge to develop a secure and ef-ficient routing scheme for *** overcome these challenges,this paper proposes a novel cluster based secure routing scheme,which aims to solve the routing and data security problem of *** this scheme,the optimal cluster head selection is based on residual energy,online time,reputation,blockchain transactions,mobility,and connectivity by using Improved Artificial bee Colony Optimization(IABC).The proposed IABC utilizes two different search equations for employee bee and onlooker bee to enhance convergence rate and exploitation ***,a lightweight blockchain consensus algorithm,AI-Proof of Witness Consensus Algorithm(AI-PoWCA)is proposed,which utilizes the optimal cluster head for *** AI-PoWCA,the concept of the witness for block verification is also involved to make the proposed scheme resource efficient and highly resilient against 51%*** results demonstrate that the proposed scheme outperforms its counterparts and achieves up to 90%packet delivery ratio,lowest end-to-end delay,highest throughput,resilience against security attacks,and superior in block processing time.

关键词： improved artificial bee colony optimization optimal cluster head selection secure routing blockchain lightweight consensus protocol

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