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A simple and easy method to measure ammonia volatilization:Accuracy under field conditions

Pedosphere 2021年第2期31卷 255-264页

作者： Márcio r.MArTINs Leonardo F.sArKIs roni F.GUArEsCHI Camila A.sANTOs selenobaldo A.C.sANT’ANNA Mohammad ZAMAN Claudia P.JANTALIA Bruno J.r.ALVEs robert M.BODDEY Ednaldo s.ArAÚJO segundo UrQUIAGA Embrapa Agrobiology Rod.BR 465km 7Seropédica RJ CEP 23891-000(Brazil) Agroscope Research Division Agroecology and EnvironmentClimate and Agriculture GroupReckenholzstrasse 191Zurich 8046(Switzerland) Federal rural University of rio de Janeiro(UFrrJ) Rod.BR 465km 7Seropédica RJ CEP 23891-000(Brazil) soil and Water Management&Crop Nutrition Joint FAO/IAEA Division of Nuclear Techniques in Food&AgricultureP.O.Box 100Vienna A-1400(Austria)

Field studies on soil ammonia(NH_(3))volatilization are restricted in many countries owing to the high costs commonly demanded for accurate *** assessed the accuracy of a simple,open chamber design to capture NH_(3)under field conditions,as affected by different chamber placement ***-15 N was surface applied to lysimeters installed in the spaces between maize *** chambers made from plastic bottles were installed on each lysimeter with variations in i)N rates(3,8,13,and 18 g m^(-2)),ii)the height of the chamber above the soil surface(0,5,and 10 mm),and iii)chamber relocation(static ***).reference lysimeters without chambers were used to measure NH_(3)losses by^(15)*** of NH_(3)-N accounted for more than 50%of the applied *** of the chambers had no impact on their NH_(3)-trapping efficiencies,proving to be an unnecessary *** in the height of the chambers above the soil surface affected the capture of NH_(3),but the results still maintained high linearity with the NH_(3)losses quantified by the reference method(r^(2)>0.98).When the same placement scheme used in the introductory study describing the chamber was utilized(static and touching the soil surface),we found a trapping efficiency of 60%,which was very similar to that(57%)obtained in the previous *** results show that this simple,open chamber design can be used with satisfactory accuracy under field conditions,provided that simple,standardized procedures are warranted.

关键词： ammonia collector chamber method field sampler gas emission low-cost chamber nitrogen cycling

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A New sine-Ikeda Modulated Chaotic Key for Cybersecurity

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Intelligent Automation & soft Computing 2023年第4期36卷 865-878页

作者： s.Hanis Department of Electronics and Communication Engineering Sri Sivasubramania Nadar College of EngineeringChennai603110India

In the recent past,the storage of images and data in the cloud has shown rapid growth due to the tremendous usage of multimedia *** this paper,a modulated version of the Ikeda map and key generation algorithm are proposed,which can be used as a chaotic key for securely storing images in the *** distinctive feature of the proposed map is that it is hyperchaotic,highly sensitive to initial conditions,and depicts chaos over a wide range of con-trol parameter *** properties prevent the attacker from detecting and extracting the keys *** key generation algorithm generates a set of sequences using a designed chaos map and uses the harmonic mean of the gen-erated sequences as the seed ***,the control parameters are modi-ﬁed after each *** change in the control parameters after each iteration makes it difﬁcult for an attacker to predict the *** designed map was tested mathematically and through *** performance evaluation of the map shows that it outperforms other chaotic maps in terms of its parameter space,Lya-punov exponent,bifurcation *** the designed chaotic map with existing chaotic maps in terms of average cycle length,maximum Lyapunov exponent,approximate entropy,and a number of iterations,it is found to be very *** existence of chaos is also proved mathematically using schwartz’s derivative *** proposed key generation algorithm was tested using the National Institute of standards and Technology(NIsT)randomness test with excellent results.

关键词： Bifurcation chaos entropy keyspace cybersecurity key generation

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Photoanode Activity of ZnO Nanotube Based Dye-sensitized solar Cells

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Journal of Materials science & Technology 2011年第11期27卷 961-966页

作者： r. ranjusha P. Lekha K.r.V. subramanian V. Nair shantikumar A. Balakrishnan Nano solar Division Amrita Center for Nanosciences

Vertical ZnO nanotube （ZNT） arrays were synthesized onto an indium doped tin oxide （ITO） glass substrate by a simple electrochemical deposition technique followed by a selective etching process. scanning electron microscopy （sEM） showed formation of well-faceted hexagonal ZNT arrays spreading uniformly over a large area. X-ray diffraction （XrD） of ZNT layer showed substantially higher intensity for the （0002） diffraction peak, indicating that the ZnO crystallites were well aligned with their c-axis. Profilometer measurements of the ZNT layer showed an average thickness of -7 μm. Diameter size distribution （DsD） analysis showed that ZNTs exhibited a narrow diameter size distribution in the range of 65-120 nm and centered at -75 nm. The photoluminescence （PL） spectrum measurement showed violet and blue luminescence peaks that were centered at 410 and 480 nm, respectively, indicating the presence of internal defects. Ultra-violet （UV） spectroscopy showed major absorbance peak at ,-348 nm, exhibiting an increase in energy gap value of 3.4 eV. By employing the formed ZNTs as the photo-anode for a dye-sensitized solar cell （DssC）, a full-sun conversion efficiency of 1.01% was achieved with a fill factor of 54%. Quantum efficiency studies showed the maximum of incident photon-to-electron conversion efficiency in a visible region located at 590-550 nm range.

关键词： ZnO nanotubes Indium doped tin oxide (ITO) glass Photoluminescence spectra Electrochemical deposition Quantum efficiency

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stability of Time-Dependent Diffusion semigroups and Kernels

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Acta Mathematica sinica,English series 1999年第4期15卷 575-586页

作者： Weian ZhengDepartment of Mathematics,University of California,Irvine,CA92612,U s ADepartment of statistics,East China Normal University,shanghai 200062,P.r.China E-mail:wzhengmath.uci.edu Department of Mathematics University of California Irvine USA Department of statistics East China Normal University Shanghai P. R. China

The main result of this paper is that when the coefficients of the time-dependent divergence form operators are Hlder continuous in time with order not too much smaller than （1/2）,the distance of the semigroups of t... 详细信息

关键词： Time-dependent diffusion semigroups stability Hlder continuous

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Experimental and Numerical Investigation on Impact Performance of Carbon reinforced Aluminum Laminates

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Journal of Materials science & Technology 2010年第4期26卷 327-332页

作者： s.H. song Y.s. Byun T.W. Ku W.J. song J. Kim B.s. Kang National Core research Center Pusan National University Busan 609-735 Korea Dept. of Aerospace Engineering Pusan National University Busan 609-735 Korea Industrial Liaison Innovation Cluster Pusan National University Busan 609-735 Korea

It is known that fiber metal laminates （FML） as one of hybrid materials with thin metal sheets and fiber/epoxy layers have the characteristics of the excellent damage tolerance, fatigue and impact properties with a relatively low density. Therefore, the mechanical components using FML can contribute the enhanced safety level of the sound construction toward the whole body. In this study, the impact performance of carbon reinforced aluminum laminates （CArAL） is investigated by experiments and numerical simulations. Drop weight tests are carried out with the weight of 4.7 kg at the speed of 1 and 2 m/s, respectively. Dynamic non-linear transient analyses are also accomplished using a finite element analysis software, ABAQUs. The experiment results and numerical results are compared with impact load-time histories. Also, energy-time histories are applied to investigate the impact performance of CArAL.

关键词： Fiber metal laminates (FML) Carbon reinforced aluminum laminates (CArAL) Numerical simulation Impact performance

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Two case reports of novel syndrome of bizarre performance of gastrointestinal endoscopy due to toxic encephalopathy of endoscopists among 181767 endoscopies in a 13-year-university hospital review: Endoscopists, first do no harm!

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World Journal of Gastroenterology 2020年第9期26卷 984-991页

作者： Mitchell s Cappell Division of Gastroenterology & Hepatology William Beaumont Hospital Oakland University William Beaumont school of Medicine

BACKGrOUND Although deficient procedures performed by impaired physicians have been reported for many specialists,such as surgeons and anesthesiologists,systematic literature review failed to reveal any reported cases of deficient endoscopies performed by gastroenterologists due to toxic *** gastroenterologists,like any individual,can rarely suffer acute-changes-inmental-status from medical disorders,and these disorders may first manifest while performing gastrointestinal endoscopy because endoscopy comprises so much of their *** sUMMArIEs Among 181767 endoscopies performed by gastroenterologists at William-Beaumont-Hospital at royal-Oak,two endoscopies were performed by normally highly qualified endoscopists who manifested bizarre endoscopic interpretation and technique during these endoscopies due to toxic ***-1-endoscopist repeatedly insisted that gastric polyps were colonic polyps,and absurdly“pressed”endoscopic steering dials to“take”endoscopic photographs;Case-2-endoscopist repeatedly insisted that had intubated duodenum when intubating antrum,and wildly turned steering dials and bumped endoscopic tip forcefully against antral *** nurses recognized endoscopists as impaired and informed *** called Chief-of-Gastroenterology who advised endoscopists to terminate their esophagogastroduodenoscopies(fulfilling ethical imperative of“physician,firstdo-no-harm”),and go to emergency room for medical *** endoscopists ***-hospital-work-up revealed toxic encephalopathy in both from:case-1-urosepsis and left-ureteral-impacted-nephrolithiasis;and case-2-dehydration and accidental ingestion of suspected illicit drug given by unidentified *** rapidly recovered with medical *** This rare syndrome(0.0011%of endoscopies)may manifest abruptly as bizarre endoscopic interpretation and technique due to impairment of endoscopists by toxic encephalopathy.

关键词： Endoscopy Iatrogenic injury Medical ethics Hippocratic Oath Quality improvement Medical malpractice Morbidity and mortality

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Effect of Temperature on Material Transfer Behavior at Different stages of Friction stir Welded 7075-T6 Aluminum Alloy

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Journal of Materials science & Technology 2013年第10期29卷 955-960页

作者： s.D.Ji Y.Y.Jin Y.M.Yue s.s.Gao Y.X.Huang L.Wang Faculty of Aerospace Engineering Shenyang Aerospace University state Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

In this work, the morphologies of weld of 7075-T6 aluminum alloy via friction stir welding （FsW） were analyzed by optical microscopy, the temperature field was attained by numerical simulation, and the effect of temperature on material transfer behavior in the thermal-mechanical affected zone （TMAZ） at different stages was mainly investigated. The FsW process consists of three stages. It is very interesting to find that the maximum transfer displacement of material appears at the final stage of welding process, then at the stable stage and at the initial stage, which results from the difference of peak temperatures at different stages. At any stage, the material in TMAZ near the surface of weld transfers downwards, the material in the middle of weld moves upwards and the material near the bottom of weld hardly moves. In any cross section of weld, the largest transfer displacement of material appears in the middle of weld. The increase of rotational velocity and the decrease of welding speed are both beneficial to the transfer displacement of material in the middle of weld.

关键词： Friction stir welding 7075-T6 aluminum alloy Thermal-mechanical affected zone Material transfer Numerical simulation

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High-pressure torsion deformation process of bronze/niobium composite

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Transactions of Nonferrous Metals society of China 2019年第8期29卷 1689-1695页

作者： s. O. rOGACHEV s. A. NIKULIN V. M. KHATKEVICH r. V. sUNDEEV D. A. KOZLOV National University of science and Technology “MIsIs” Leninsky pr. 4 Moscow 119049 Russia russian Technological University “MIrEA” pr. Vernadskogo 78 Moscow 119454 Russia

The deformation process in the material volume under high-pressure torsion(HPT)was *** a model object for the observation of deformation process,we used a composite comprising a bronze matrix and niobium *** arrangements of the niobium filaments in the bronze matrix and their size have regular *** allows us to monitor and measure the displacement of the niobium filaments in the sample volume,which results from *** bronze/niobium composite samples were subjected to HPT at room temperature and 6 GPa,and the number of revolutions N=1/4,1/2,1,2,3 and *** was shown that HPT with revolution number of 1 leads to the 360° rotation of entire sample volume without sample *** deformational behavior during HPT can be expected for high-ductility metallic *** increase in the number of revolutions more than 2 leads to twisting the niobium filaments in the sample volume and the formation of 'vortex' multilayer *** mechanisms for the formation of such structures were discussed.

关键词： high-pressure torsion severe plastic deformation metal matrix composite vortex structure

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Dielectric Behavior of Modified Cellulose

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Journal of Materials science & Technology 1999年第2期15卷 164-168页

作者： El-Henawii, s.A. saad, s.M. El-Anwar, I.M. Faculty of science Helwan University Egypt Chemistry Department Faculty of Science Al-Azhar University Egypt Physical Chemistry Unit of the N.R.C Egypt

The dielectric constants and the dielectric loss, as well as the activation energy of dielectric relaxation of silylated cellulose were measured within the frequency range 10**5 to 10**7 Hz and the temperature range from 10 to 50 degree C. The test samples were activated cellulose with ethylene diamine, with sodium hydroxide and inactivated cellulose before and after silylation. The measurements were carried out using a multi-deka-meter. Cellulose molecules are more activated by treatment with ethylene diamine than with sodium hydroxide. Generally, silylation causes a marked decrease of the dielectric constant and dielectric loss, meanwhile the silylated samples are affected with the pretreatment of linters with sodium hydroxide and ethylene diamine. (Edited author abstract) 28 refs.

关键词： Cellulose

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An Improved steganographic scheme Using the Contour Principle to Ensure the Privacy of Medical Data on Digital Images

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Computer systems science & Engineering 2023年第8期46卷 1563-1576页

作者： r.Bala Krishnan D.Yuvaraj P.suthanthira Devi Varghese s.Chooralil N.rajesh Kumar B.Karthikeyan G.Manikandan srinivasa ramanujan centre sastra deemed universitykumbakonamtamil naduindia department of computer science cihan university–duhokkurdistan regioniraq department of information technology st.joseph’s college of engineeringchennaitamil naduindia department of computer science&engineering rajagiri school of engineering&technologykakkanadkeralaindia school of computing sastra deemed universitythanjavurtamil naduindia

With the improvement of current online communication schemes,it is now possible to successfully distribute and transport secured digital Content via the communication channel at a faster transmission *** steganography and cryptography concepts are used to achieve the goal of concealing secret Content on a media and encrypting it before *** of the techniques mentioned above aid in the confidentiality of feature *** proposed approach concerns secret content embodiment in selected pixels on digital image layers such as red,Green,and *** private Content originated from a medical client and was forwarded to a medical practitioner on the server end through the *** K-Means clustering principle uses the contouring approach to frame the pixel clusters on the image *** content embodiment procedure is performed on the selected pixel groups of all layers of the image using the Least significant Bit(LsB)substitution technique to build the secret Content embedded image known as the stego image,which is subsequently transmitted across the internet medium to the server *** experimental results are computed using the inputs from“Open-Access Medical Image repositories(***)”and demonstrate the scheme’s impudence as the Content concealing procedure progresses.

关键词： Contouring secret content embodiment least significant bit embedding medical data preservation secret content congregation pixel clustering

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