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Application of.Shear wave Elastography and Contrast-Enhanced Ultrasound in Transrectal Prostate Biopsy

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Current Medical Science 2022年第2期42卷 447-452页

作者： Gao-wa SHAREN Jun ZHANG Department of.Ultrasound Affiliated Hospital of Inner Mongolia Medical UniversityHohhot010050China Department of.Urology Affiliated Hospital of Inner Mongolia Medical UniversityHohhot010050China

Objective To explore the clinical value of.ultrasound shear wave elastography(SWE)and contrast-enhanced ultrasound(CEUS)in transrectal prostate *** A total of.54 patients(average age:67.79±12.01 years)in the experimental group underwent transrectal prostate biopsy under the guidance of.SWE,while 46 patients(average age:69.22±11.54 years)in the control group underwent transrectal prostate biopsy guided by *** There were a total of.451 needles,with an average of.8.35±1.67 needles per patient in the experimental group,and a total of.462 needles,with an average of.10.04±1.33 needles per patient in the control *** dif.erence in puncture times between the two groups was statistically signif.cant(Pwas no signif.cant dif.erence in the positive detection rate,sensitivity or specif.city between the two groups(P>0.05),but there was a signif.cant dif.erence in the diagnostic accuracy between the two groups(Pf.prostate cancer were signif.cantly higher in the experimental group than in benign prostatic hyperplasia(Pf.E_(mean)was 0.752(S.E.=0.072,95%CI=0.611-0.894,P=0.007),and the best cutof. value was 47.005 *** In summary,both SWE-and CEUS-guided transrectal prostate biopsy can help f.nd the f.cus and guide the puncture,and improve the positive detection rate.

关键词： prostate puncture ultrasonic shear wave elastography contrast-enhanced ultrasound biopsy analysis

Interf.cial ef.ects in electromagnetic coupling within piezoelectric phononic crystals

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Acta Mechanica Sinica 2009年第1期25卷 95-99页

作者： f. J. Sabina A.B.Movchan Instituto de Investigaciones en Matematicas Aplicadas yen Sistemas Universidad Nacional Autónoma de México Department of.Mathematical Sciences University of Liverpool

In this paper, we discuss waves in piezoelectric periodic composite, with the emphasis on the connection between the electromechanical coupling and the ef.ects of.dispersion of.Bloch-f.oquet waves. A particular attention is given to structures containing interf.ces between dissimilar media and localization of.the electrical f.elds near such interf.ces.

关键词： Piezoelectric periodic composites Interf.ces Dispersion of.Bloch-f.oquet waves

Advances in photothermal conversion of.carbon dioxide to solar f.els

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Journal of.Energy Chemistry 2023年第8期83卷 62-78,I0004页

作者： wa Gao Yinwen Li Dequan Xiao Ding Ma College of.Bioscience and Resources Environment Beijing University of AgricultureBeijing 102206China College of.Chemistry and Molecular Engineering and College of.Engineering Peking UniversityBeijing 100871China Center f.r Integrative Materials Discovery Department of Chemistry and Chemical and Biomedical EngineeringUniversity of New HavenWest HavenCT 06516USA

Converting carbon dioxide(CO_(2)) into usef.l f.els or chemical f.edstocks is important f.r achieving peak carbon emission and carbon ***,photothermal catalysis has been extensively studied and applied due to its advantages over traditional heat-driven *** this review,we f.cus on photothermal catalysis of.thermodynamically uphill reactions that convert CO_(2)into value-added *** f.rst introduce the f.ndamentals of.photothermal catalysis f.r CO_(2)reduction,including the def.nition and classif.cation of.photothermal catalysis,f.llowed by their photothermal conversion *** structure design of.dif.erent types of.photothermal catalysts is *** superior perf.rmance of.photothermal catalytic conversion of.CO_(2)is illustrated and discussed,including improved CO_(2)activation,tunable selectivity towards dif.erent solar f.el products,and resistance to sintering and ***,the perspectives and challenges in this cutting-edge f.eld are presented with the aim of.advancing understanding of.the underlying mechanisms and inspiring rational design of.photothermal catalysts f.r highly ef.icient solar-to-f.el conversion.

关键词： Solarenergy Photothermal catalysis CO_(2)reduction Catalyst design Perf.rmance improvement

Nanostructured Catalyst f.r f.scher-Tropsch Synthesis

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Chinese Journal of.Chemistry 2018年第9期36卷 798-808页

作者： wa Gao Qingshan Zhu Ding Ma College of.Chemistry and Molecular Engineering and College of.Engineering Peking University Beijing 100871 China f.itz-Haber-Institut der Max-Planck-Gesellschaf. Faradayweg 4-6 D-14195 Berlin Germany

f.scher-Tropsch synthesis （f.S） is a heterogeneous catalytic process f.r the production of.f.els or chemicals f.om synthesis gas （CO ＋ H2）, which can be derived f.om nonpetroleum f.edstocks such as natural gas, coal, or biomass. Co, Ru, f. and Ni are all active in f.S, but only cheaper f. and Co based catalysts are used in industry because the price of.Ru is relatively high. However, the industrial f.- and Co-based f.S catalysts normally work at a relatively high temperature range of.493--623 K in order to get a reasonable space time yield. Moreover, the product selectivity of.f.S is governed by the law of.polymerization, i.e., a so-called Anderson-Schulz-f.ory distribution holds, which restricts its industrial application. In this account, we highlight some of.our progress toward the design/f.brication of.nanostructured f., Co and Ru catalysts to improve f.S activity at the low temperature and to change the product selectivity and conf.ne the product distribution into a certain range.

关键词： catalyst f.scher-Tropsch synthesis nanostructure

Precise integration methods based on the Chebyshev polynomial of.the f.rst kind

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Earthquake Engineering and Engineering Vibration 2008年第2期7卷 207-216页

作者： wang Mengf. f. T. K. Au Department of.Civil Engineering Hunan University Changsha 410082 China Department of.Civil Engineering The University of Hong Kong China

This paper introduces two new types of.precise integration methods based on Chebyshev polynomial of.the f.rst kind f.r dynamic response analysis of.structures, namely the integral f.rmula method （If.） and the homogenized initial system method （HISM）. In both methods, nonlinear variable loadings within time intervals are simulated using Chebyshev polynomials of.the f.rst kind bef.re a direct integration is perf.rmed. Developed on the basis of.the integral f.rmula, the recurrence relationship of.the integral computation suggested in this paper is combined with the Crout decomposed method to solve linear algebraic equations. In this way, the If. based on Chebyshev polynomial of.the f.rst kind is constructed. Transf.rming the non-homogenous initial system to the homogeneous dynamic system, and developing a special scheme without dimensional expansion, the HISM based on Chebyshev polynomial of.the f.rst kind is able to avoid the matrix inversion operation. The accuracy of.the time integration schemes is examined and compared with other commonly used schemes, and it is shown that a greater accuracy as well as less time consuming can be achieved. Two numerical examples are presented to demonstrate the applicability of.these new methods.

关键词： structural dynamics Chebyshev polynomial of.the f.rst kind the Crout decomposed method integral f.rmula method homogenized initial system method

Chemical composition and antibacterial activity of.Gongronema latif.lium

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Journal of.Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第5期8卷 352-358页

作者： ELEYINMI Af.labi f. Department of.Agricultural Food and Nutritional Sciences University of Alberta Edmonton T6G 2P5 Canada Food Science and Technology Department Federal University of Technology Akure 34001 Ondo State Nigeria

Chemical composition of.Gongronema latif.lium leaves was determined using standard methods. Aqueous and methanol G. latif.lium extracts were tested against thirteen pathogenic bacterial isolates. Crude protein, lipid extract, ash, crude f.bre and nitrogen f.ee extractives obtained are： 27.2%, 6.07%, 11.6%, 10.8% and 44.3% dry matter respectively. Potassium, sodium, calcium, phosphorus and cobalt contents are 332, 110, 115, 125 and 116 mg/kg respectively. Dominant essential amino acids are leucine, valine and phenylalanine. Aspartic acid, glutamic acid and glycine are 13.8%, 11,9% and 10.3% respectively of.total amino acid. Saturated and unsaturated f.tty acids are 50.2% and 39.4% of.the oil respectively. Palmitic acid makes up 36% of.the total f.tty acid. Extracts show no activity against E. f.ecalis, Y. enterolytica, E. aerogenes, B. cereus and E. agglomerans. Methanol extracts were active against S, enteritidis, S. cholerasius ser typhimurium and P. aeruginosa （minimum inhibitory concentration （MIC） 1 mg; zone of.growth inhibition 7, 6.5 and 7 mm respectively）. Aqueous extracts show activity against E. coli （MIC 5 mg） and P. aeruginosa （MIC 1 mg） while methanol extracts are active against P. aeruginosa and L. monocytogenes. G. laf.f.lium has potential f.od and antibacterial uses.

关键词： Gongronema latif.lium Chemical composition Antibacterial activity

Mechano-thermal synthesis and characterization of.nano-structured f./f.S f.r application in photocatalysis

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Particuology 2018年第2期16卷 72-80页

作者： H. Esmaili S. Sheibani f. Rashchi School of.Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran 11155-4563 Iran

A novel method was used to prepare a nano-structured 32 wt% f./f.S core/shell powder via a mechanothermal route by l-h heat treatment of.a mechanically activated powder mixture of.f. and S. The structural and microstructural characteristics, f.rmation mechanism, magnetic properties, and photocatalytic activity of.the powder were studied by X-ray dif.raction, f.eld emission scanning electron microscopy, transmission electron microscopy, surf.ce area analysis, dif.erential scanning calorimetry, vibrating sample magnetometry, and UV-vis spectrophotometry. A detailed study of.the mechanism of.transf.rmation showed that during the heat treatment process, an f.S2 phase was f.rmed as the intermediate product. In the f.nal product, an f.S shell approximately 2 nm in thickness was f.rmed on the f. core. In the presence of.NaCI as a process control agent, the particle size decreased and the size distribution became more unif.rm. Mechanical activation and NaCI addition together led to a decrease of.the saturation magnetization f.om 82 to 74emu/g. The photocatalytic activity of.the powder in the degradation of.methylene blue was 50%.

关键词： f./f.S Core-shell Mechano-therma Nano-structure Photocatalyst

Soil Pore Characterization Using f.ee Sof.ware and a Portable Optical Microscope

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Pedosphere 2013年第4期23卷 503-510页

作者： L. f. PIRES f. S. BORGES S. PASSONI A. B. PEREIRA Department of.Physics State University of Ponta Grossa (UEPG) Department of.Soil Science State University of Ponta Grossa (UEPG)

Total porosity （TP）, determined by image analysis, pore type and pore size distribution were evaluated on impregnated soil blocks f.om an undisturbed Brazilian sandy loam soil using a digital portable optical microscope. The f.ee sof.ware Image J （version 1.40g） was used f.r image analysis. Procedures f.r soil image collection and analysis were presented. The image analysis allowed the evaluation of.pore sizes with diameters ranging f.om 20 to 〉 1 000 μm. The f.llowing types of.pores were also obtained： rounded, elongated and intermediate. The results M[owed the characterization of.the soil as moderately porous （TP = 21.6%）. Rounded, intermediate and elongated pores were responsible f.r 11.6%, 31.7% and 56.7% of.TP. In relation to pore size 51.1% of.TP was in the 100-500μm size class and a third of.TP came f.om the pores larger than 500μm.

关键词： image analysis soil porosity soil structure pore size distribution

Numerical Investigation of.f.ow f.elds in Inductively Coupled Plasma Wind Tunnels

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Plasma Science and Technology 2014年第10期16卷 930-940页

作者：喻明浩 Yusuke TAKAHASHI Hisashi KIHARA Ken-ichi abe Kazuhiko YAMADA Takashi abe Department of.Aeronautics and Astronautics Kyushu UniversityFukuoka 819-0395Japan Division of.Mechanical and Space Engineering Hokkaido UniversitySapporo 060-8628Japan Institute of.Space and Astronautical Science Japan Aerospace Exploration AgencySagamihara 252-5210Japan

Numerical simulations of.10 kW and 110 kW inductively coupled plasma （ICP） wind tunnels were carried out to study physical properties of.the f.ow inside the ICP torch and vacuum chamber with air as tile working gas. Two-dimensional compressible axisymmetric Navier- Stokes （N-S） equations that took into account 11 species and 49 chemical reactions of.air, were solved. A heat source model was used to describe the heating phenomenon instead of.solving the electromagnetic equations. In the vacuum chamber, a f.ur-temperature model was coupled with N-S equations. Numerical results f.r tile 10 kW ICP wind tunnel are presented and discussed in detail as a representative case. It was f.und that the plasma f.ow in the vacuum chamber tended to be in local thermoehemical equilibrium. To study the inf.uence of.operation conditions on the f.ow f.eld, simulations were carried out f.r dif.erent chamber pressures and/or input powers. The computational results f.r the above two ICP wind tunnels were compared with corresponding experimental data. The computational and experimental results agree well, theref.re the f.ow f.elds of.ICP wind tunnels can be clearly understood.

关键词： inductively coupled plasma Joule heating vacuum chamber chemical reactions