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cervical cytology: A Review of 597 cases in a Tertiary Health centre in Nigeria

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case Reports in clinical Medicine 2018年第4期7卷 259-268页

作者： S. Singh D. c. Nnadi R. f. Anas I. g. Ango A. g. Umar U. Mohammed Y. K. Mohammed Department of Obstetrics and gynaecology Usmanu Danfodiyo University Teaching Hospital Sokoto Nigeria Department of Histopathology Usmanu Danfodiyo University Teaching Hospital Sokoto Nigeria

Background: cervical cancer is the most common gynaecological cancer among women in the developing countries. It is preventable by early detection and treatment of the precursor lesions. cervical cytology became the standard screening test for cervical cancer and premalignant lesions with the introduction of the Papanicolau (Pap) smear. Aim: to determine the uptake, indications and results of cervical cytology in a tertiary health center in Nigeria. Materials and Methods: a 5-year descriptive study of the results of cervical cytology among women who attended the gynaecological outpatient clinic of the Hospital. Results: a total of 597 cases of cervical Pap smears were received at the histopathology department during the study period out of which 20 (3.4%) were inadequate for cytological evaluation. The patients age ranged from 15 to 80 (mean 38.8 SD = 11.4) years. The average annual uptake of the cervical smear was 9.3% of the total number of patients seen in the gynaecological clinic during the study period and the main indications were routine medical check-up, 256 (42.9%) and cervicitis 76 (12.7%). About 398 (66.7%) were normal smears while 152 (26.3%) were abnormal. Non-specific inflammatory changes were present in 113 (74.3%) cases. cytology was positive for intraepithelial lesions in 6.8% (39/577) cases. Eighteen percent (7/39) of them were high-grade lesions while squamous cell carcinoma was detected in 12.8% (5/39) cases. conclusion: the uptake of cervical cytology of 8.7% is low and the main indication was routine check up. Premalignant lesions were detected in 6.8% of cases.

关键词： cervical cytology cervical cancer Nigeria

Secure and Light Weight Elliptic curve cipher Suites in SSL/TLS

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computer Systems Science & Engineering 2022年第1期40卷 179-190页

作者： B.Arunkumar g.Kousalya coimbatore Institute of Technology Coimbatore641014India

In the current circumstance,e-commerce through an online banking system plays a significant *** may either buy goods from E-commerce websites or use online banking to move money to other *** a user participates in these types of behaviors,their sensitive information is sent to an untrust-worthy *** a consequence,when transmitting data from an internal browser to an external E-commerce web server using the cryptographic protocol SSL/TLS,the E-commerce web server ensures the security of the user’s *** user should be pleased with the confidentiality,authentication,and authenticity properties of the SSL/TLS on both the user’s web browser and the remote E-commerce web server.E-commerce web servers should choose the best SSL/TLS cipher suites for negotiating the user in order to attain such optimistic scenarios,as the cipher suite used in SSL/TLS plays an important role in securing E-commerce web *** paper primarily focuses on analyzing the SSL/TLS cipher and elliptic *** paper also recommends the best elliptic curve cipher suites for E-commerce and online banking servers,based on their power consumption,handshake execution time,and key exchange and signature verification time.

关键词： Elliptic curve cipher suites secp256r1 curve25519 ed25519

Development of Al356e-Al_2O_3 Nanocomposite coatings by High Velocity Oxy-fuel Technique

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Journal of Materials Science & Technology 2013年第9期29卷 813-820页

作者： Y.Mazaheri f.Karimzadeh M.H.Enayati Department of Materials Engineering Isfahan University of Technology

In this research, development of AI356-AI203 nanocomposite coatings has been investigated. AI356-AI203 composite powders were prepared by mechanical milling of AI356 powder and 5 vol.% micro and nanoscaled alumina particles. The milled powders were used as feedstock to deposit composite coatings on A356-T6 aluminum alloy substrate using high velocity oxy-fuel （HVOf） process. X-ray diffractometry, optical and scanning electron microscopy, microhardness and wear tests were used to characterize the composite powders and coatings. The hardness of composite coatings containing micro and nanosized AI203 were 114.1 ± 5.9 HV and 138.4 ± 6.9 HV, respectively which were higher than those for substrate （79.2 ± 1.1 HV）. Nano and microcomposite coatings revealed low friction coefficients and wear rates, which were significantly lower than those obtained for AI356-T6 substrate. Addition of 5 vol.% micro and nanoscaled alumina particles improved the wear resistance by an average of 85% and 91%, respectively. This is mainly caused by the presence of AI203 in matrix and nanocrystalline structure of matrix. Scanning electron microscopy tests revealed different wear mechanisms on the surface of the wear test specimens.

关键词： AI356-AI203 nanocomposite composite coatings Mechanical milling High velocity oxy-fuel (HVOf) Wear

The Relationship Between Developmental Accumulation of Leaf Soluble Proteins and Vernalization Response of Wheat(Triticum aestivum ***. Thell)

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Agricultural Sciences in china 2009年第4期8卷 410-417页

作者： M Majdi g Karimzadeh S Mahfoozi Plant Breeding and Biotechnology Department Faculty of AgricultureTarbiat Modares UniversityP.O.Box 14115-336Tehran ***Iran Physiology-Agronomy Unit of Department of cereals Research Seed and Plant Improvement InstituteKaraj 315854119Iran

The relationship between vernalization requirement and quantitative and qualitative changes in total leaf soluble proteins were determined in one spring （cv. Kohdasht） and two winter （cvs. Sardari and Norstar） cultivars of wheat （Triticum aestivum L.） exposed to 4℃. Plants were sampled on days 2, 14, 21 and 35 of exposure to 4℃. The final leaf number （fLN） was determined throughout the vernalization periods （0, 7, 14, 24, and 35 d） at 4℃. The final leaf number decreased until days 24 and 35 in Sardari and Norstar eultivars, respectively, indicating the vernalization saturation at these times. No clear changes were detected in the final leaf number of Kohdash cultivar, verifying no vernalization requirement for this spring wheat cultivar. comparing with control, clear cold-induced 2-fold increases in proteins quantity occurred after 48 h following the 4℃-treatment in the leaves of the both winter wheat cultivars but, such response was not detected in the spring cultivar. However, the electrophoretic protein patterns showed between-cultivar and between-temperature treatment differences. With increasing exposure time to 4℃, the winter cultivars tended to produce more HMW polypeptides than the spring cultivar. Similar proteins were induced in both Sardari and Norstar winter wheat cultivars, however, the long vernalization requirement in Norstar resulted in high level and longer duration of expression of cold-induced proteins compared to Sardari with a short vernalization requirement. These observations indicate that vernalization response regulates the expression of low temperature （LT） tolerance proteins and determines the duration of expression of LT- induced proteins.

关键词： soluble proteins wheat Triticum aestivum L. final leaf number vernalization cold

capacitive coupled Wide-Notch Stepped Impedance Narrow-Band Bandpass filter for WiMax Application

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computer Systems Science & Engineering 2022年第11期43卷 501-514页

作者： A.Kayalvizhi g.Sankara Malliga Department of Electronics and communication Engineering Anand Institute of Higher TechnologyChennaiTamil Nadu603103India

The development of wireless communication standards necessitates optimal filter design for the selection of appropriate bands of *** this work,a compact in size pair of parallel coupled symmetric stepped impedancebased resonator is designed with supporting to the WiMAX communication *** coupled resonator is tuned to allow the frequency band between 3.4 gHz and 3.8 gHz,which is centered at 3.6 gHz.A parasitic effect of capacitively coupled feed structure is used for exciting the two symmetrical stepped impedance *** bandwidth and selectivity of the filter are enhanced with the change of characteristic impedances and controlling the coupling gap between *** design offers single narrow sharp passband selectivity as well as multiple stopband harmonic suppression arising as a result of multiple transmission *** designed filter operates with a fractional bandwidth(fBW)of 11.47%.The proposed single narrowband bandpass filter provides better suppression in either side of the tuned frequency(3.6 gHz)without degrading the passband ***,this novel filter offers an insertion loss of about−0.08 dB and a return loss of greater than−30 dB in *** approach is useful for eliminating unwanted spurious harmonics responses that enter the desired *** suggested bandpass filter has been simulated using Advanced Design System(ADS)tool,and the measurement has been made using a network analyzer,and the results are reported.

关键词： Single narrowband bandpass filter fractional bandwidth selectivity insertion loss return loss transmission zeros

NUMERIcAL SOLUTION Of THE SINgULARLY PERTURBED PROBLEM WITH NONLOcAL BOUNDARY cONDITION

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Applied Mathematics and Mechanics(English Edition) 2002年第7期23卷 755-764页

作者： g.M.Amiraliyev Musa cakDr Department of Mathematics Y Y University65080 VanTurkey communicated by HE Ji-huan Original Member of Editorial CommitteeAMM

Singularly perturbed boundary value problem with nonlocal conditions is examined. The appopriate solution exhibits boundary layer behavior for small positive values of the perturbative parameter. An exponentially fitted finite difference scheme on a non-equidistant mesh is constructed for solving this problem. The uniform convergence analysis in small parameter is given. Numerical example is provided, too.

关键词： exponentially fitted difference scheme singular perturbation nonlocal boundary condition

Analysis of switching conditions of chalcogenide alloys during crystallization

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Journal of University of Science and Technology Beijing 2006年第5期13卷 446-449页

作者： Wanhua Yu c.D. Wright Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China School of Engineering and computer Science University of Exeter Exeter EX4 4QF UK

To understand the principle and limitation of chalcogenide alloy ge2Sb2Te5 （gST） in solid-state memory devices during crystallization, it was necessary to develop a physically realistic model that could reflect the electrical and thermal properties of these media. A novel comprehensive numerical model has been developed for simulating these memory devices, which describes the electrical and thermal behavior using the solution of the nonlinear, time-dependent electrical and heat conduction equation. The finite-difference-time-domain technique was adopted to compute the electrical field and heat distribution in the device. Several contributing factors that affect the crystallization switching process such as the geometry of the gST layer, temperature and electric field dependency of the electrical conductivity have been discussed. The results of the simulations were then used to provide critical guidelines for fabrication and optimization of the device performance.

关键词： chalcogenide alloy crystallization simulation modeling memory

Effects of dietary hemp seed oil to sows on fatty acid profiles,nutritional and immune status of piglets

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Journal of Animal Science and Biotechnology 2020年第2期11卷 545-562页

作者： D.Vodolazska c.Lauridsen Department of Animal Science Faculty of Technical SciencesAarhus UniversityBlichers Allé208830 TjeleDenmark

Background:The oil from industrial hemp seeds(cannabis sativa)is an ideal source of stearidonic acid,which is a precursor fatty acid for the long-chained n-3 polyunsaturated fatty *** fatty acids are important for neonatal development,health and *** seed oil has been investigated for the influence on human health,but research on the impact in pig nutrition is *** aim of our research was to study the effect of dietary hemp seed oil relative to soybean oil to lactating sows on the transfer of fatty acids to the off-spring and the effect on piglets’immune and nutritional ***:The fatty acid composition of the hemp seed and the soybean oil influenced the fatty acid composition of sow plasma,colostrum and mature *** highest proportion of c18:3n-3,c18:4n-3 and c20:4n-6 was obtained in mature milk fat of sows fed 5%hemp seed oil diet when compared to the other dietary fat sources(5%soybean oil or a 50:50 mix of hemp and soybean oil at 5%).The effect of dietary oil supplementation to sows was reflected in the plasma fatty acids profile of *** the proportion of c20:5n-3 and c22:5n-3 was the highest in plasma of piglets suckling sows fed hemp seed oil-containing diets,whereas no c18:4n-3 could be detected hence indicating conversion ofα-linolenic acid(ALA)and stearidonic acid(SDA)to the longer chained n-3 polyunsaturated fatty *** fat source also influenced number of born piglets,their weight gain during first week,plasma concentration of glucose and Igg,and haematological ***:The hemp seed oil resulted in direct maternal supply with n-3 long-chain polyunsaturated fatty acids(LcPUfA),especially ALA and SDA,and piglets were able to convert these fatty acids obtained via the sow milk intake to c20:5n-3 and c22:***,some interesting effects of the 5%hemp seed oil was obtained with regard to piglet initial body weight gain and glucose,which could be of interest for further research,i.e.,the

关键词： Arachidonic acid Immunoglobulin Omaga-3 fatty acids Pig Vitamin E

Recovery of rare and precious metals from urban mines —— A review

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frontiers of Environmental Science & Engineering 2017年第5期11卷 3-19页

作者： Mengmeng Wang Quanyin Tan Joseph f. chiang Jinhui Li Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Ministry of Education of China School of Environment Tsinghua University Beijing 100084 China Department of chemistry and Biochemistry State University of New York College at Oneonta Oneonta NY 13820 USA

Urban mining is essential for continued natural resource extraction. The recovery of rare and precious metals （RPMs） from urban mines has attracted increasing attention from both academic and industrial sectors, because of the broad application and high price of RPMs, and their low content in natural ores. This study summarizes the distribution characteristics of various RPMs in urban mines, and the advantages and shortcomings of various technologies for RPM recovery from urban mines, including both conventional （pyrometallurgical, hydrometallurgical, and biometallurgical processing）, and emerging （electrochemical, supereritieal fluid, mechanochemical, and ionic liquids processing） technologies. Mechanical/physical technologies are commonly employed to separate RPMs from nonmetallic components in a pre-treatment process. A pyrometallurgical process is often used tbr RPM recovery, although the expensive equipment required has limited its use in small and medium-sized enterprises. Hydrometallurgical processing is effective and easy to operate, with high selectivity of target metals and high recovery efficiency of RPMs, compared to pyrometallurgy. Biometallurgy, though, has shown the most promise for leaching RPMs from urban mines, because of its low cost and environmental friendliness. Newly developed technologies electrochemical, supercritical fluid, ionic liquid, and mechanochemical have offered new choices and achieved some success in laboratory experiments, especially as efficient and environmentally friendly methods of recycling RPMs. With continuing advances in science and technology, more technologies will no doubt be developed in this field, and be able to contribute to the sustainability of RPM mining.

关键词： Rare and precious metals (RPMs) Distribution characteristics Recycling technology Emerging technology Supercritical fluid