检索结果-南通市图书馆

Chitosan as A Preservative for Fruits and Vegetables:A Review on Chemistry and Antimicrobial Properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2019年第1期4卷 11-21页

作者： Chao DUAN Xin MENG Jingru MENG MdIqbal Hassan khan Lei DAI avik khan Xingye AN Junhua ZHANG Tanzina HUQ Yonghao NI College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXi’an 710021China Department of Chemical Engineering University of New BrunswickFrederictonNB E3B 5A3Canada Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and TechnologyTianjin 300457China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China

Chitosan,derived from chitin,a major constituent(in quantity)of crustaceans,is a unique aminopolysaccharide with emerging commercial potential in agriculture,food,pharmaceuticals and nutraceuticals due to its nontoxic,biodegradable and biocompatable properties.Chitosan coating on fruits and vegetables has been found to be effective for the reduction of a variety of harmful micro-organims and extend the shelf-life of these products.In this review,our focus is on the antimicrobial properties of chitosan and its application as a natural preservative for fresh products.We detailed the key properties that are related to food preservation,the molecular mechanism of the antimicrobial activity of chitosan on fungi,gram-positive and gram-negative bacteria,coating methods for using chitosan and its formulation for preserving fruits and vegetables,as well as the radiation method of producing chitosan from chitin.Understanding the economic and scientific factors of chitosan’s production and efficiency as a preservative will open its practical application for fruits and vegetable preservation.

关键词： chitosan food preservative oligochitosan coating antimicrobial property

Preparation and chemical characterization of banana/orange composite wine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2016年第2期1卷 74-79页

作者： Hongmei Deng Chun Wang Huining Xiao avik khan School of Environmental and Biological Engineering Guangdong University of Petrochemical TechnologyMaoming525000China Department of Chemical Engineering University of New BrunswickFrederictonNBCanada E3B 5A3

Banana/orange composite wine was brewed in the lab by liquid fermentation using angel yeast and lactic acid bacteria as the fermentation strains,and characterized by chemical analyses.It was found that the best ratio of banana juice to navel orange juice was 1:2,and the optimum alcohol fermentation parameters were as follows:28~30℃,22%initial sugar content,6%yeast,and 6 days of fermentation to reach an alcohol concentration of 11.63%v/v.The free amino acids in the composite wines were tested by automatic amino acid analyzer,and the flavor components of the composite wine were determined and analyzed by gas chromatography-mass spectrometry(GC-MS).Seven types of trace elements in the composite wine were measured by atomic absorption spectrometry.Results showed that there were 17 free amino acids,and their total concentration was up to 897.6 mg/L.A total of 16 key compounds were identified in the composite wine,11 of which were ester,4 of which were alcohols and 1 of which was acid.Magnesium,iron,copper and manganese elements were relatively rich in the wine,while lead was extremely low.

关键词： Banana Navel orange Fermentation Fruit wine Amino acid Volatile aroma components Trace elements

Nanocellulosic materials:research/production activities and applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2017年第2期2卷 45-49页

作者： Xingye An Dong Cheng Jing Shen Qingming Jia Zhibin He Linqiang Zheng avik khan Bo Sun Bitao Xiong Yonghao Ni Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and TechnologyTianjin 300457China Department of Chemical Engineering University of New BrunswickFrederictonNew BrunswickE3B 5A3Canada Key Laboratory of Bio-based Material Science and Technology Ministry of EducationNortheast Forestry UniversityHarbin 150040China Department of Chemical Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Food Nutrition and Safety Tianjin University of Science and TechnologyMinistry of EducationTianjin 300457China School of Science Zhejiang University of Science and TechnologyHangzhouZhejiang310023China.

Nanocelluloses have emerged as novel materials and attracted significant interest from both academia and industry.Nanocelluloses can now be produced at pilot plant and pre-commercial scales,and even at commercial scales in some regions in the world.Successful commercial applications of nanocelluloses have entered commercial stages though their full potentials are yet to be developed.In this short communication,the applications of these nanomaterials are high-lighted,including high-volume applications(e.g.,paper,textiles),high-value applications(e.g.,aerogels and structure materials for aerospace),and novel/emerging applications(e.g.,organic light emitting diodes,photonic films).Close collaboration between industries and the academic world would facilitate the development of commercial markets for using nanocelluloses in existing/new areas.

关键词： Nanocelluloses Nanocrystalline cellulose(NCC) Nanofibrillated cellulose(NFC) Cellulose filaments(CF) Cellulose whiskers(CW)

Doppler-resilient waveform design in integrated MIMO radar-communication systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第1期67卷 187-202页

作者： Zhengchun ZHOU Bing LIU Bingsheng SHEN avik Ranjan ADHIKARY Pingzhi FAN Institute of Mobile Communications Southwest Jiaotong University Department of Mathematics Southwest Jiaotong University

In recent years,the increased high-rate wireless services(5G and 6G) and reliable sensing capabilities(automotive radar,air traffic control,geophysical monitoring),have led to more serious spectrum congestion.Conventionally,radars and communication systems are often seen to be “competing” for the same resources.In this scenario,an integrated platform for radar and communication systems seems to be an optimal solution to address the problem.In this paper,we propose a preamble waveform design based on zero-correlation zone(ZCZ) and zero odd-correlation zone(ZOCZ) sequence sets,which are Doppler resilient in multiple-input,multiple-output(MIMO) radar.The preamble waveforms can be simultaneously used for channel estimation and radar sensing in RadCom systems.The ambiguity function of the proposed waveforms displays low/zero sidelobes within a time-delay correlation zone.Finally,we give some numerical results to show the efficiency of the proposed waveforms in radar sensing and channel estimation.

关键词： ambiguity function correlation channel estimation integrated radar and communication (RadCom) systems MIMO radar zero correlation zone (ZCZ) sequence set zero odd-correlation zone (ZOCZ) sequence set

The outcomes and safety of patients undergoing endoscopic retrograde cholangiopancreatography combining a single-use cholangioscope and a single-use duodenoscope:A multicenter retrospective international study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2024年第1期23卷 71-76页

作者： Alessandro Fugazza Matteo Colombo Michel Kahaleh V.Raman Muthusamy Bick Benjamin Wim Laleman Carmelo Barbera Carlo Fabbri Jose Nieto Abed Al-Lehibi Mohan Ramchandani Amy Tyberg Haroon Shahid avik Sarkar Dean Ehrlich Stuart Shermand Cecilia Binda Marco Spadaccini Andrea Iannone Kareem Khalaf Nageshwar Reddy Andrea Anderloni Alessandro Repici Division of Gastroenterology and Digestive Endoscopy Humanitas Research Hospital-IRCCSVia Manzoni 5620089RozzanoMilanoItaly Gastroenterology Rutgers Robert Wood JohnsonNew BrunswickNew JerseyUSA Vatche and Tamar Manoukian Division of Digestive Diseases University of CaliforniaLos Angeles School of Medicine at UCLALos AngelesCaliforniaUSA Division of Digestive and Liver Disorders Indiana University School of MedicineIndianapolisINUSA Department of Gastroenterology and Hepatology University Hospitals LeuvenKU Leuven3000 LeuvenBelgium U.O.C.di Gastroenterologia ed Endoscopia Digestiva Ospedale Giuseppe MazziniASL TeramoItaly Gastroenterology and Digestive Endoscopy Unit Forlì-Cesena HospitalsAUSL RomagnaForlì-CesenaItaly Borland Groover Clinic JacksonvilleFloridaUSA Department of Gastroenterology and Hepatology King Fahad Medical CityRiyadhSaudi Arabia Asian Institute of Gastroenterology HyderabadIndia Section of Gastroenterology Department of Emergency and Organ TransplantationUniversity of BariBari 70124Italy Department of Biomedical Sciences Humanitas UniversityVia Rita Levi Montalcini 420090Pieve EmanueleMilanItaly

Background: Duodenoscope-related multidrug-resistant organism(MDRO) infections raise concerns. Disposable duodenoscopes have been recently introduced in the market and approved by regulatory agencies with the aim to reduce the risk of endoscopic retrograde cholangiopancreatography(ERCP) associated infections. The aim of this study was to evaluate the outcome of procedures performed with single-use duodenoscopes in patients with clinical indications to single-operator cholangiopancreatoscopy. Methods: This is a multicenter international, retrospective study combining all patients who underwent complex biliopancreatic interventions using the combination of a single-use duodenoscope and a single-use cholangioscope. The primary outcome was technical success defined as ERCP completion for the intended clinical indication. Secondary outcomes were procedural duration, rate of cross-over to reusable duodenoscope, operator-reported satisfaction score(1 to 10) on performance rating of the single-use duodenoscope, and adverse event(AE) rate. Results: A total of 66 patients(26, 39.4% female) were included in the study. ERCP was categorized according to ASGE ERCP grading system as 47(71.2%) grade 3 and 19(28.8%) grade 4. The technical success rate was 98.5%(65/66). Procedural duration was 64(interquartile range 15-189) min, cross-over rate to reusable duodenoscope was 1/66(1.5%). The satisfaction score of the single-use duodenoscope classified by the operators was 8.6 ± 1.3 points. Four patients(6.1%) experienced AEs not directly related to the single-use duodenoscope, namely 2 post-ERCP pancreatitis(PEP), 1 cholangitis and 1 bleeding.Conclusions: Single-use duodenoscope is effective, reliable and safe even in technically challenging procedures with a non-inferiority to reusable duodenoscope, making these devices a viable alternative to standard reusable equipment.

关键词： Single-operator cholangioscopy Single-use duodenoscope Endoscopic retrograde cholangiopancreatography Indeterminate biliary stricture Difficult biliary stones

维普期刊数据库

Liquid ordering induced heterogeneities in homogeneous nucleation during solidification of pure metals

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第11期106卷 77-89页

作者： avik Mahata Tanmoy Mukhopadhyay Mohsen Asle Zaeem School of Engineering Brown UniversityProvidenceRI02912USA Department of Engineering Science University of OxfordOxfordOX13PJUK Department of Aerospace Engineering Indian Institute of Technology KanpurKanpurIndia Department of Mechanical Engineering Colorado School of MinesCO80401USA

Homogeneous crystal nucleation is prone to formation of defects and often experiences heterogeneities,the inferences of which are crucial in processing crystalline materials and controlling their physical properties. It has been debated in literature whether the associated heterogeneities are an integral part of the homogenous nucleation. In this study by integrating a probabilistic approach with large-scale molecular dynamics simulations based on the most advanced high-temperature interatomic potentials, we attempt to address the ambiguity over the sources and mechanisms of heterogeneities in homogenous nucleation during solidification of pure melts. Different classes of structured metals are investigated for this purpose,including face-centered cubic aluminum, body-centered cubic iron, and hexagonal close-packed magnesium. The results reveal, regardless of the element type or the solidified crystal structure, that the densification process of liquid metals is accompanied by short-range orderings of atoms prior to the formation of crystals, controlling the heterogeneities during homogenous nucleation.

关键词： Homogeneous nucleation Heterogeneity Solidification Metals Molecular dynamics simulation Probability density

维普期刊数据库

Asymptotically Optimal Golay-ZCZ Sequence Sets with Flexible Length

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2023年第4期32卷 806-820页

作者： GU Zhi ZHOU Zhengchun Adhikary avik Ranjan FENG Yanghe FAN Pingzhi School of Information Science and Technology Southwest Jiaotong University School of Mathematics Southwest Jiaotong University College of Systems Engineering National University of Defense Technology Institute of Mobile Communications Southwest Jiaotong University

Zero correlation zone(ZCZ) sequences and Golay complementary sequences are two kinds of sequences with different preferable correlation properties.Golay-ZCZ sequences are special kinds of complementary sequences which also possess a large ZCZ and are good candidates for pilots in OFDM systems. Known GolayZCZ sequences reported in the literature have a limitation in the length which is the form of a power of 2. In this paper, we propose two constructions of Golay-ZCZ sequence sets with new parameters which generalize the constructions of Gong et al.(IEEE Trans. Commun., 61(9),2013) and Chen et al.(IEEE Trans. Commun., 66(11), 2018).Notably, one of the two constructions generates optimal binary Golay-ZCZ sequences, while the other generates asymptotically optimal polyphase Golay-ZCZ sequences as the number of sequences increases. We also show, through numerical simulations, the applicability of the proposed Golay-ZCZ sequences in inter-symbol interference channel estimation. Interestingly, in certain application scenarios, the proposed Golay-ZCZ sequences performs better as compared to the existing state-of-the-art sequences.

关键词： Aperiodic correlation Binary sequence Complete complementary codes Golay complementary sequence Golay-ZCZ sequences Inter-symbol interference channel estimation Zero correlation zone

Targeting BPOZ-2 in Lewy body disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2016年第6期11卷 910-911页

作者： avik Roy Department of Neurological Sciences Rush University Medical Center

Formation of Lewy body inclusions（LBs）in the substantia nigra（SN）is a very well-characterized pathological hallmark of Parkinson’s disease（PD）.LBs are aggregates of many biologically inactive proteins including structural elements,alpha-synuclein（asyn）-binding proteins,synphilin-1-binding proteins,and components of the ubiquitin-proteasome system.

关键词： Targeting substantia proteasome nigra ubiquitin biologically inactive mitochondria dopamine parkin

维普期刊数据库

Molecular dynamics simulation of nanometer scale mechanical properties of hexagonal Mgsingle bondLi alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2016年第1期4卷 36-43页

作者： avik Mahata Koushik Sikdar Department of Aerospace Engineering Indian Institute of ScienceBengaluru 560012India Surface and Tribology Laboratory Department of Materials Science and EngineeringIndian Institute of TechnologyKanpur 208016India

Nano mechanical behavior of Mgsingle bondLi nanowire is investigated under tension and compression to elicit property alteration due to Li alloying in Mg within hexagonal range.Embedded atom method(EAM)is employed to carry out present simulation work.Nanowire under consideration is supposed to be isotropic and mechanical behavior is uninfluenced by material texture.The elastic modulus,yield strength both in tension and compression is assessed with change in strain rate.Effects of temperature in tension and compression are studied.Results of present simulation work elicit serrated yielding under uniaxial tension,however,twin mediated deformation under compression is completely tuned with previously reported experimental works.This investigation bridges nanometer scale properties to microscale material response,which in turn can be applied for designing suitable robust processing routes of this material.

关键词： Molecular dynamic simulation Nanowire Mechanical behavior