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Manufacturing of SEM and TEM Samples for Oocyte
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作者 武彩红 张斌 +2 位作者 郑筱峰 芮荣 戴建军 《Agricultural Science & Technology》 CAS 2009年第5期110-112,188,共4页
[ Objective] The research aimed to explore the manufacturing methods of scanning electron microscope (SEM) and transmission electron microscopy (TEM) for oocyte and provide technical support for related research. ... [ Objective] The research aimed to explore the manufacturing methods of scanning electron microscope (SEM) and transmission electron microscopy (TEM) for oocyte and provide technical support for related research. [ Method] Based on GV-and MII-stage oocytes, samples of SEM and TEM were prepared respectively, then ultrastructure changes were observed. [ Result] The results showed that the method needed few samples, keep intact cell morphology and can see clear ultrastructure. [Conclusion] The method is suitable for ultrastructural observation of oocyte. 展开更多
关键词 OOCYTE Scanning electron microscope sem Transmission electron microscope (TEM) ULTRASTRUCTURE
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Detection of Bisphenol A (BPA) in Plastic Bottles Using Vertical Cultivation at Various Temperatures
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作者 Karwan Alkaradaghi Tara Ali +2 位作者 Nadhir Al-Ansari Polla Khanaqa Jan Laue 《Journal of Environmental Protection》 2024年第6期656-671,共16页
Polycarbonate plastics containing bisphenol A (BPA) used to manufacture drinking water bottles. Kurdistan region in northern Iraq is a developed area with increased pollution from plastic bottles. Trace amounts of BPA... Polycarbonate plastics containing bisphenol A (BPA) used to manufacture drinking water bottles. Kurdistan region in northern Iraq is a developed area with increased pollution from plastic bottles. Trace amounts of BPA have been detected in bottled water samples. The absorption of BPA was measured with HPLC using a vertical cultivation system with Bulbs of the Allium Cepa plant planted in these plastic bottles with monitored growth. Vertical cultivation was found to have a low level of BPA in the plant cells, making it a safe cultivation method under specific climate conditions. The mean concentration of BPA in vertical cultivation is 0.19 ug/ml (3.8 ng for a 20 uL injection), and the Limit of Quantification (LOQ) is 0.63 ug/ml (12.7 ng for 20 uL injection). While Scanning Electron Microscope (SEM) shows that the concentrations are relatively low in water samples stored at room temperature compared to those exposed to direct sunlight (40°C) and water bottle samples stored at (-4°C), The correlation coefficients were found to be good (0.9992). SEM is used for plastic bottle samples stored at different temperatures. The images identify compound decay and explore the morphology of BPA in manufactured plastic materials. 展开更多
关键词 Vertical Cultivation ALLIUM Bisphenol A Plastic Bottles Scanning Electron Microscope (sem)
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Investigation of meso-failure behaviors of Jinping marble using SEM with bending loading system 被引量:6
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作者 Jianping Zuo Xu Wei +1 位作者 Jianliang Pei Xiaoping Zhao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2015年第5期593-599,共7页
In th is study, th e m eso-failure m ech an ism an d fracture surface o f Jinping m arble w ere investigated bym ean s o f scanning electro n m icroscope (SEM) w ith ben d in g loading system and laser-scanner equip... In th is study, th e m eso-failure m ech an ism an d fracture surface o f Jinping m arble w ere investigated bym ean s o f scanning electro n m icroscope (SEM) w ith ben d in g loading system and laser-scanner equipment. The Y antang an d B aishan m arbles specim ens from Jinping II hyd ro p o w er sta tio n w ere used. Testresu lts show th a t th e fracture to u g h n ess and m echanical behaviors o f Y antang m arble w ere basicallyh ig h er th a n th o se o f Baishan m arble. This is m ainly d u e to th e fact th a t Baishan m arble co n tain s a largep ercen tag e o f d o lom ite an d m in o r mica. Crack pro p ag atio n p a th and fracture m orphology in d icated th a tth e d irection o f ten sile stress has a significant effect on th e m echanical behaviors an d fracture toughnesso f B aishan m arble. For Yantang an d B aishan m arbles, a large n u m b e r o f m icrocracks a ro u n d th e m aincrack tip w ere observed w h e n th e directio n o f ten sile stress w as parallel to th e bed d in g plane.C onversely, few m icrocracks o ccurred w h e n th e directio n o f ten sile stress w as p erp en d icu lar to th ebed d in g plane. The presen ce o f a large n u m b e r o f m icrocracks a t th e m ain crack tip d ecreased th e globalfracture to u g h n ess o f m arble. The results o f th re e -p o in t ben d in g te sts show ed th a t th e average bearingcapacity o f intact m arble is 3.4 tim es th e notch ed m arble, b u t th e ductility p ro p e rty o f th e defectivem arble afte r p eak load is b e tte r th a n th a t o f th e intact m arble. H ence, large d efo rm atio n m ay beg en erated before failure o f in tact m arbles a t Jinping II h y d ro p o w er station. The fractal d im en sio n o ffracture surface w as also calculated by th e cube covering m eth o d . O bservational resu lt show ed th a t th elargest fractal dim en sio n o f Y antang m arble is cap tu red w h e n th e directio n o f ten sile stress is parallel toth e bedding plane. H ow ever, th e fractal d im en sio n o f fracture surface o f Yantang an d Baishan m arblesw ith ten sile stress vertical to th e bed d in g plane is relatively sm all. The fractal d im en sio n can also be usedto characterize th e ro ughness o f fracture surface o f rock m aterials. 展开更多
关键词 Jinping marble Bedding plane Meso-failure mechanism Scanning electron microscope (sem) In-situ observation
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New and interesting diatoms from the Shimen Wetwalls,Yunnan Province,China.Ⅱ.The diatom genus Nupela Vyverman&Compère(Bacillariophyceae)
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作者 Qi LIU Xi LUO +1 位作者 Shulian XIE John Patrick KOCIOLEK 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2023年第1期327-341,共15页
We detailed the valve morphology of five new species of diatom genus Nupela from wetwall communities in Yunnan Province,China,with light and scanning electron microscope.The five new species demonstrate great variabil... We detailed the valve morphology of five new species of diatom genus Nupela from wetwall communities in Yunnan Province,China,with light and scanning electron microscope.The five new species demonstrate great variability within the genus,as three of them are biraphid and two are monoraphid.In addition,variation was noted in the structure of internal proximal raphe ends,with some species having anchor-shaped ends and other species have hooked ends.The genus Nupela has grown considerably in 30years since it was first proposed,going from a monotypic genus to over 85 taxa.Diagnosis of the genus is based on the presence of an external covering over the areolae.We discussed the systematic placement of Nupela within the naviculoid diatoms.Yunnan Province appears to harbor many endemic diatom taxa,and many regions of the province have yet to be studied. 展开更多
关键词 Nupela scanning electron microscope(sem) Yunnan new species morphology China BACILLARIOPHYCEAE
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Influence of different mining layouts on the mechanical properties of coal 被引量:15
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作者 Xie Heping Zhao Xiaoping +2 位作者 Liu Jianfeng Zhang Ru Xue Dongjie 《International Journal of Mining Science and Technology》 SCIE EI 2012年第6期749-755,共7页
Non-pillar mining,top-coal caving and protected coal seam mining are the most popular mining methods in coal exploitation,and the different mining layouts will change the stress state and failure mechanism of coal in ... Non-pillar mining,top-coal caving and protected coal seam mining are the most popular mining methods in coal exploitation,and the different mining layouts will change the stress state and failure mechanism of coal in front of the working face.In this paper,mining-induced mechanical behaviors under three mining layouts have been simulated in the laboratory to investigate the effects of mining layouts on the deformation and strength of coal.Furthermore,the coal failure mechanism under different mining layouts is analyzed microscopically.The experimental results indicate that the stage characteristics of the coal deformation are obvious.Under the serial action of non-pillar mining,top-coal caving and protected coal seam mining layouts,the values of radial deformation,volume strain and Poisson's ratio increase,while the peak strength and deformation modulus decrease at the same buried depth,and the peak strength under non-pillar mining,top-coal caving and protected coal seam mining is about 3.0,2.5 and 2.0 times of the initial confining pressure,respectively.The results also indicate that the trend of the coal deformation decreases with the increase of the buried depth under the same mining layout,while the strength and deformation modulus increase,and the failure mechanism under three mining layouts is dominated with shear/tensile failure. 展开更多
关键词 MINING LAYOUTS COAL MECHANICAL property SCANNING electron microscope(sem) Failure mechanism
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Morphological and toxicity characteristics of Pseudo-nitzschia pungens strain PP0201-01 isolated from the East China Sea 被引量:5
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作者 李爱峰 于仁成 +2 位作者 王云峰 颜天 周名江 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2005年第4期418-426,共9页
The morphology and toxicity of Pseudo-nitzschia strain PP0201-01, isolated near the estuary of Changjiang (Yangtze) River in Year 2002 and tentatively identified as Pseudo-nitzschia pungens, were studied. The strain w... The morphology and toxicity of Pseudo-nitzschia strain PP0201-01, isolated near the estuary of Changjiang (Yangtze) River in Year 2002 and tentatively identified as Pseudo-nitzschia pungens, were studied. The strain was identified morphologically as P. pungens using scanning electronic microscope (SEM). The ana- lytical results of LC-PDA (liquid chromatography with photodiode array detector), LC-MS (liquid chromatogra- phy with mass detector), and the toxicity data from mouse bioassay, showed that no domoic acid was produced by the strain. However, the mechanism of domoic acid production by Pseudo-nitzschia species is complicated. More works are needed to assess the toxic species and to evaluate the potential risk of amnesic shellfish poison- ing (ASP) in China. 展开更多
关键词 domoic acid Pseudo-nitzschia pungens scanning electronic microscope sem mouse bioassay LC-UV LC-MS
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Surface Microtextures of Slipping Zone Soil of Some Landslides in the Three Gorges Reservoir District and Their Significance 被引量:5
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作者 YAN Chunjie SUN Yunzhi TANG Huiming 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2000年第2期349-352,共4页
The mineral assemblage and content and surface microtextures of slipping zone soil of several landslides in the Three Gorges Reservoir District have been analyzed using the scanning electron microscope (SEM) and X-ray... The mineral assemblage and content and surface microtextures of slipping zone soil of several landslides in the Three Gorges Reservoir District have been analyzed using the scanning electron microscope (SEM) and X-ray diffractometer (XRD). All the mineral assemblages are similar in these landslides. The main minerals are montmorillonite, illite, kaolinite, chlorite, quartz and feldspar. There are two kinds of surface microtexture in the slipping zone soil, i.e., linear scratches and arcuate scratches. Based on analyses of the changes of the microtextures, one can obtain information about the number, directions and stages of landslide movements. The authors have also studied the mechanism of landslide formation, evaluated the stability of landslides and revival possibility of ancient landslides and forecasted the activity of similar landslides in different districts. The surface microtexture features of stable landslides and mobile landslides are summarized and it is concluded that the existence of filamentous bacteria may result in or increase movements of landslides. 展开更多
关键词 The Three Gorges Reservoir district LANDSLIDE surface microtexture scanning electron microscope (sem)
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Electrochemical characterization of Ni-Co and Ni-Co-Fe for oxidation of methyl alcohol fuel with high energetic catalytic surface 被引量:4
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作者 Subir Paul Sk Naimuddin Asmita Ghosh 《燃料化学学报》 EI CAS CSCD 北大核心 2014年第1期87-95,共9页
Non Pt based metals and alloys as electrode materials for methyl alcohol fuel cells have been investigated w ith an aim of finding high electrocatalytic surface property for the faster electrode reactions.Electrodes w... Non Pt based metals and alloys as electrode materials for methyl alcohol fuel cells have been investigated w ith an aim of finding high electrocatalytic surface property for the faster electrode reactions.Electrodes w ere fabricated by electrodeposition on pure Al foil,from an electrolyte of Ni,Co,Fe salts.The optimum condition of electrodeposition w ere found out by a series of experiments,varying the chemistry of the electrolyte,pH valve,temperature,current and cell potential.Polarization study of the coated Ni-Co or Ni-CoFe alloy on pure Al w as found to exhibit high exchange current density,indicating an improved electro catalytic surface w ith faster charge-discharge reactions at anode and cathode and low overvoltage.Electrochemical impedance studies on coated and uncoated surface clearly show ed that the polarization resistance and impedance w ere decreased by Ni-Co or Ni-Co-Fe coating.X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDX)and atomic absorption spectroscopy(AAS)studies confirmed the presence of alloying elements and constituents of the alloy.The morphology of the deposits from scanning electron microscope(SEM)images indicated that the electrode surface w as a three dimensional space w hich increased the effective surface area for the electrode reactions to take place. 展开更多
关键词 ELECTRODEPOSITION Ni-Co alloy ELECTROCATALYTIC exchange current density impedance X-ray diffraction(XRD) scanning electron microscope(sem)
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Thermal effects on fracture toughness of cracked straight-through Brazilian disk green sandstone and granite 被引量:3
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作者 Lei Zhou Weiting Gao +3 位作者 Liyuan Yu Zheming Zhu Jianxing Chen Xingkai Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第5期1447-1460,共14页
Cracked straight-through Brazilian disc(CSTBD) samples prepared using two rock materials were used for thermal treatment from room temperature to 700℃. Uniaxial splitting experiments were performed using an automatic... Cracked straight-through Brazilian disc(CSTBD) samples prepared using two rock materials were used for thermal treatment from room temperature to 700℃. Uniaxial splitting experiments were performed using an automatic electro-hydraulic servo press to study the evolution laws of physical and fracture properties of different deep rock materials under high-temperature geological conditions. The fracture characteristics were measured using an industrial camera and digital image correlation technology to analyze the effect of high temperature on fracture properties and failure modes of the CSTBD samples after different thermal treatments. The micro-damage properties of green sandstone and granite materials were obtained using a scanning electron microscope(SEM). The following conclusions were drawn from the test results:(1) With the increasing temperature, the fracture characteristics of green sandstone and granite change from brittle fracture to plasticity fracture, the longitudinal wave velocity of granite decreases sharply at 600℃, and the damage factor reaches 0.8748 at 700℃.(2) The fracture toughness of green sandstone and granite decreases with increasing temperature;however, the decreasing range of granite is larger than that of green sandstone.(3) As the temperature increases, the fracture morphologies of green sandstone and granite materials become rougher, whereas thermal damage cracks of granite and intergranular fractures inside sandstone as well as pores of sandstone increase.(4) The crack tip opening displacement and peak strain corresponding to peak load increase with the temperature. 展开更多
关键词 High temperature Cracked straight-through Brazilian disc(CSTBD)sample Fracture toughnessm Scanning electron microscope(sem)
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Research on the intermediate phase of 40CrMnSiB steel shell under different heat treatments 被引量:1
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作者 Wei-bing Li Zhi-chuang Chen +1 位作者 Xiao-ming Wang Wen-bin Li 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期1032-1041,共10页
In this study, 40 Cr Mn Si B steel cylindrical shells were tempered at 350, 500 and 600 ℃ to study the effect of tempering temperature on the dynamic process of expansion and fracture of the metal shell. A midexplosi... In this study, 40 Cr Mn Si B steel cylindrical shells were tempered at 350, 500 and 600 ℃ to study the effect of tempering temperature on the dynamic process of expansion and fracture of the metal shell. A midexplosion recovery experiment for the metal cylinder under internal explosive loading was designed, and the wreckage of the casings at the intermediate phase was obtained. The effects of different tempering temperatures on the macroscopic and microscopic fracture characteristics of 40 Cr Mn Si B steel were studied. The influence of tempering temperatures on the fracture characteristic parameters of the recovered wreckage were measured and analyzed, including the circumferential divide size, the thickness and the number of the circumferential divisions. The results show that as the tempering temperature was increased from 350 to 600 ℃, at first, the degree of fragmentation and the fracture characteristic parameters of the recovered wreckage changed significantly and then became essentially consistent. Scanning electron microscopy analysis revealed flow-like structure characteristics caused by adiabatic shear on different fracture surfaces. At the detonation initiation end of the casing, fracturing was formed by tearing along the crack, which existed a distance from the initiation end and propagated along the axis direction. In contrast, the fracturing near the middle position consists of a plurality of radial shear fracture units. The amount of alloy carbide that was precipitated during the tempering process increased continuously with tempering temperature, leading to an increasing number of spherical carbide particles scattered around the fracture surface. 展开更多
关键词 Explosive mechanics Mid-explosion recovery experiment Explosion and fracture Heat treatment sem(Scanning electron microscope)fracture analysis
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Study of the Adherence Mechanism Between the Metal and Inorganic Coating with Mill Addition of Li_2Ni_8O_(10) Nano Powder 被引量:1
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作者 钱蕙春 蒋伟忠 《Journal of Donghua University(English Edition)》 EI CAS 2009年第3期293-299,共7页
The adherence strength between the metal and the inorganic coating can be greatly increased by mill addition of Li2Ni8O10. The interface structure between metal and the inorganic coating with excellent adherence has b... The adherence strength between the metal and the inorganic coating can be greatly increased by mill addition of Li2Ni8O10. The interface structure between metal and the inorganic coating with excellent adherence has been studied by investigating the chemical composition and the microstrncture as well as elements valence bond on the interface with the help of scanning electron microscope (SEM), electron microprobe, and Auger elctron spectroscope (AES). The results show that there is a non-stoichiometrieal transitional layer on the interface between metal and the inorganic coating with excellent adherence, the adherence between metal and the non-stoichiometrical transitional layer is achieved by the metallic bond and the adherence between the non- stoichiometrical transitional layer and the inorganic coating is produced by ionic and covalent bond. The non-stoichiometrical transitional layer results in the strong adherence. 展开更多
关键词 scanning electron microscope sem electron spectroscope AES electron microprobe ADHERENCE mechanism coating
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Investigating the Effect of Fatigue on Fracturing Resistance of Rocks 被引量:1
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作者 Nazife Erarslan David John Williams 《Journal of Civil Engineering and Architecture》 2012年第10期1310-1318,共9页
There is no doubt that an understanding of brittle rock fracturing is a key element in the solution of many engineering problems that involve rock structures. Some rock structures such as bridge and dam abutments and ... There is no doubt that an understanding of brittle rock fracturing is a key element in the solution of many engineering problems that involve rock structures. Some rock structures such as bridge and dam abutments and foundations, and tunnel walls, undergo both static and cyclic loading caused by drilling and blasting, and vehicle-induced vibrations. This type of loading often causes rock to fail at a lower than its static strength due to the effect of rock fatigue. A series of laboratory diametrical compression tests was performed on Brisbane tuff disc specimens to investigate their mode-I fracture toughness response to static and cyclic loading, as a function of the applied load. Both the static and cyclic loading tests were carried out on CCNBD (cracked chevron notched Brazilian disc) rock specimens. In the tests described herein, the reduction in fracture toughness under dynamic cyclic loading was found to be up to 48% of the static fracture toughness. Contrary to the static tests, the cyclic tests produced much more crushed material in front of the tip of the chevron notched crack. 展开更多
关键词 Fracture toughness rock fatigue CCNBD sem (scanning electron microscope)
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Fatigue Behavior of a Dissimilar Aluminum Alloy Welding Joint With and Without Natural Defect
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作者 SHI Liang WANG Chiquan +2 位作者 LIU Zhiyi WANG Juntao WANG Wukun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第5期1000-1008,共9页
In order to investigate the influence of natural defect on the fatigue behavior of 5A06/7A05 dissimilar aluminum alloys welding joint,fatigue tests of two types of specimens with and without defects were carried out s... In order to investigate the influence of natural defect on the fatigue behavior of 5A06/7A05 dissimilar aluminum alloys welding joint,fatigue tests of two types of specimens with and without defects were carried out systematically under stress amplitude control conditions (stress ratio R=0.1) at normal temperature in laboratory air condition.Furthermore,a new parameter,i e,fatigue defect effect factor (FDEF) was introduced to assess the effect of defect on fatigue strength.The fatigue failure analysis was conducted as well to compare the fatigue and fracture behavior of the two types of specimens.The results show that:(1) natural defects have a strong effect on the fatigue lives of welding joint,and the differences between the specimens with and without defects can reach 80 times under a same theoretical net sectional stress;(2) the FDEF parameter introduced is effective to deal with the defect effect,and the FDEF decreases along with the increase of fatigue life.The mean relative error between the experimental data and predicted fatigue strength based on the FDEF is 10.2%;(3) the macro fracture of both types of specimens have three typical zones,i e,fatigue source zone,crack propagation zone and final fracture zone,while there are more than one fatigue sources for specimens with natural defects.The overall pattern of crack propagation zone and fracture zone are quite similar,but the morphologies are different in details. 展开更多
关键词 aluminum alloys welding joint natural defect fatigue life scanning electron microscope(sem)
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Characterization of polyhydroxyalkanoates synthesized in activated sludge using three carbon sources
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作者 ZHANG Yan-ping 《Journal of Beijing Institute of Technology》 EI CAS 2016年第3期429-434,共6页
Polyhydroxyalkanoates(PHAs)were synthesized in activated sludge using three types of carbon sources(sodium acetate,sodium propionate and sodium butyrate),and their characterization were studied.It was shown that t... Polyhydroxyalkanoates(PHAs)were synthesized in activated sludge using three types of carbon sources(sodium acetate,sodium propionate and sodium butyrate),and their characterization were studied.It was shown that the content of PHA synthesized by microorganisms in activated sludge were different.The biggest synthetic amount up to 36.7% of VSS was obtained when sodium acetate was used as carbon source.The polymer yield was lower when using sodium propionate as the carbon source than when using others,with25.1% of VSS,while resulted in an increase of hydroxyvalerate(HV)units produced.The structure and thermal properties of extracted biopolymers were analyzed by scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR)and themogravimetry(TG). 展开更多
关键词 polyhydroxyalkanoates (PHAs) bio-polymer scanning electron microscope sem Fourier transform infrared spectroscopy (FTIR) activated sludge
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Measurement Analysis in Electrochemical Discharge Machining (ECDM) Process: A Literature Review
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作者 Pravin Pawar Raj Ballav Amaresh Kumar 《Journal of Chemistry and Chemical Engineering》 2015年第2期140-144,共5页
Electrochemical discharge machining is considered to be a hybrid machining process that combines with EDM and ECM (electro chemical machining), called ECDM. The material removal is based on two phenomena: electroch... Electrochemical discharge machining is considered to be a hybrid machining process that combines with EDM and ECM (electro chemical machining), called ECDM. The material removal is based on two phenomena: electrochemical dissolution of the material and thermal erosion of electrical discharges that occur between the cathode & anode electrodes. This process is better used for machining of non conducting materials efficiently. In this research paper shows that a brief literature review study of various measuring instruments used for analysis of various parameters of the electrochemical discharge machining process on various types of materials, tool material, input & output parameters such as surface roughness, surface texture, material removal, tool wear etc.. 展开更多
关键词 ECDM sem (scanning electron microscope) oscilloscope.
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Repair and Restoration of the Historical Wellesley Bridge at Sriran­gapatna:A Case Study
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作者 Madan Kumar L Pruthviraj S R Ravi Kumar C M 《Journal of Smart Buildings and Construction Technology》 2022年第1期28-39,共12页
The Historical Wellesley Bridge,built by the Krishnaraja Wadiyar under the supervision of Dewan Purnaih across river Cauvery at Srirangapatna.Situation of bridge is got when heavy rainfall followed by heavy inflow fro... The Historical Wellesley Bridge,built by the Krishnaraja Wadiyar under the supervision of Dewan Purnaih across river Cauvery at Srirangapatna.Situation of bridge is got when heavy rainfall followed by heavy inflow from Cauvery Catchment area in Kodagu District.At present,the Government of Karnataka has taken measures to do the restoration works using the same previously used materials with slight changes.Hence,in the present investigation the authors are doing a case study on the above structure by testing the ingredients of the materials used for it and also by conducting Non-Destructive Test on the structure to know its strength before and after restoration.Based on the test results obtained,the authors will give a conclusion with respect to durability aspects.In addition to the above,the authors will test for few alternative materials i.e.,lime mortar with Cement(i.e.MM2 Grade Masonary mortar).Finally,from the obtained test results here the authors can suggest suitable material for the structures. 展开更多
关键词 Repair and restoration Scanning electron microscope(sem)
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Comparison of Antioxidant Activities of Silver Nanoparticles and Methanol Extracts of Three Indigenous Nigeria Herbal Seeds
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作者 Prisca Nneka Onuoha Nuria Chinonyerem Oganezi +2 位作者 Christopher Uche Okoronkwo Uzoaga Linda Nkiruka Peter Azikiwe Onwualu 《Food and Nutrition Sciences》 CAS 2022年第7期702-719,共18页
The antioxidant of seeds was carried out using extracts from methanol and Silver Nanoparticles from the spice. The SEM shows the shapes, dispersion and agglomeration of the sample, while the EDX confirms the SEM and t... The antioxidant of seeds was carried out using extracts from methanol and Silver Nanoparticles from the spice. The SEM shows the shapes, dispersion and agglomeration of the sample, while the EDX confirms the SEM and the presence of some compounds. The FT-IR reveals the AgNP<sub>s</sub> capping and reducing the particular biomolecule from the functional group for identification. Compounds found in the FT-IR seeds of Capsicum annum are Ag L (Silver iodide), C K (Cyanogen chloride), P K (Phenol). Monodora myristica are Mo L (Molybdenum), Ag L (Silver iodide), C K (Cyanogen chloride), P K (Phenol), Mg K (Magnesium). Piper guineense are Ag L (Silver iodide), Ci K (Potassium chloride), C K (Cyanogen chloride), P K (Phenol). The seeds show that the AgNP<sub>S</sub> of CA and MM has a better antioxidant activity than the methanol of CA and MM, while the PG methanol has a better activity than the AgNP<sub>S</sub> PG. The control (Catechin and Galic acid) has a slight overall better DPPH activity than the AgNP<sub>S</sub>. It is important to note that there is a concentration dependency in CA, MM AgNP<sub>S,</sub> PG methanol respectively. Notably, at CA methanol, the conc. at 125 was higher than the conc. at 250. Hence, there is need to create a great part in using plant samples for making tabulated or capsulated drugs for treatment of diseases and using plant silver nanoparticles to develop a healthy food/drug preservative package material “smart packaging” that will enhance shelf-life. 展开更多
关键词 Piper guineense (PG) or Uziza Monodora myristica (MM) or Ehuru and Capsicum annum (CA) or Cayenne Pepper Scanning Electron Microscope/Energy Dispersive X-Ray (sem/EDX) Silver Nanoparticles (AgNPs) Fourier-Transform Infrared (FT-IR) 2 2-Diphenyl-1-Picryl-Hydrazyl Radical Scavenging (DPPH) Silver Nitrate (AgNO3)
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SEM imaging of insulating specimen through a transparent conducting veil of carbon nanotube
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作者 Xinyu Gao Guo Chen +10 位作者 He Ma Yuchen Ju Ke Zhang Lin Cong Wen Ning Zi Yuan Zebin Liu Lina Zhang Peng Liu Shoushan Fan Kaili Jiang 《Nano Research》 SCIE EI CSCD 2022年第7期6407-6415,共9页
Observing the morphology of insulating specimen in scanning electron microscope(SEM)is of great significance for the nanoscale semiconductor devices and biological tissues.However,the charging effect will cause image ... Observing the morphology of insulating specimen in scanning electron microscope(SEM)is of great significance for the nanoscale semiconductor devices and biological tissues.However,the charging effect will cause image distortion and abnormal contrast when observing insulating specimen in SEM.A typical solution to this problem is using metal coating or water-removable conductive coating.Unfortunately,in both cases the surface of the specimen is covered by a thin layer of conductive material which hides the real surface morphology and is very difficult to be completely removed after imaging.Here we show a convenient,residue-free,and versatile method to observe real surface morphology of insulating specimen without charging effect in SEM with the help of a nanometer-thick film of super-aligned carbon nanotube(SACNT).This thin layer of SACNT film,like metal,can conduct the surface charge on insulating specimen through the sample stage to the ground,thus eliminating the charging effect.SACNT film can also be used as the conductive tape to carry and immobilize insulating powder or particles during SEM imaging.Different from the metal coating,SACNT film is transparent,so that the real microstructure of the insulating specimen surface can be observed.In addition,SACNT film can be easily attached to and peeled off from the surface of specimen without any residue.This convenient,residue-free,and versatile method can open up new possibilities in nondestructive SEM imaging of a wide variety of insulating materials,semiconductor devices,and biological tissues. 展开更多
关键词 insulating specimen scanning electron microscope(sem) super-aligned carbon nanotube(SACNT)film real morphology residue-free non-destructive imaging
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Deep Learning,Feature Learning,and Clustering Analysis for SEM Image Classification
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作者 Rossella Aversa Piero Coronica +1 位作者 Cristiano De Nobili Stefano Cozzini 《Data Intelligence》 2020年第4期513-528,共16页
In this paper,we report upon our recent work aimed at improving and adapting machine learning algorithms to automatically classify nanoscience images acquired by the Scanning Electron Microscope(SEM).This is done by c... In this paper,we report upon our recent work aimed at improving and adapting machine learning algorithms to automatically classify nanoscience images acquired by the Scanning Electron Microscope(SEM).This is done by coupling supervised and unsupervised learning approaches.We first investigate supervised learning on a ten-category data set of images and compare the performance of the different models in terms of training accuracy.Then,we reduce the dimensionality of the features through autoencoders to perform unsupervised learning on a subset of images in a selected range of scales(from 1μm to 2μm).Finally,we compare different clustering methods to uncover intrinsic structures in the images. 展开更多
关键词 Neural networks Feature learning Clustering analysis Scanning Electron Microscope(sem) Image classification
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Fabrication technique of micro/nano-scale speckle patterns with focused ion beam 被引量:7
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作者 LI YanJie XIE HuiMin +4 位作者 LUO Qiang GU ChangZhi HU ZhenXing CHEN PengWan ZHANG QingMing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第6期1037-1044,共8页
The fabrication technique of micro/nano-scale speckle patterns with focused ion beam (FIB) system is studied for digital image correlation (DIC) measurement under a scanning electron microscope (SEM).The speckle patte... The fabrication technique of micro/nano-scale speckle patterns with focused ion beam (FIB) system is studied for digital image correlation (DIC) measurement under a scanning electron microscope (SEM).The speckle patterns are fabricated by directly etching the counterpart of the specimen to the black part of a template.Mean intensity gradient is used to evaluate the quality of these SEM images of speckle patterns fabricated based on different templates to select an optimum template.The pattern size depending on the displacement measurement sensitivity is adjusted by altering the magnification of FIB according to the relation curve of the etching size versus magnification.The influencing factors including etching time and ion beam current are discussed.Rigid body translation tests and rotation tests are carried out under SEM to verify the reliability of the fabricated speckle patterns.The calculated values are in good agreement with the imposed ones. 展开更多
关键词 speckle pattern digital image correlation (DIC) micro/nano-scale focused ion beam (FIB) scanning electron microscope sem
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