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Analysis and design of axially loaded piles in rock

Journal of Rock mechanics and Geotechnical engineering 2019年第3期11卷 535-548页

作者： c.M.Haberfield A.L.e.Lochaden Golder Associates Pty.Ltd. MelbourneAustralia

Despite significant advancements in in situ test techniques,construction practices,understanding of rock joint and rock mass behaviours,and numerical analysis methods,the design of bored concrete cast-insitu piles in rock is still largely based on the assessment of bearing ***,for many of the rock conditions encountered,the bearing capacity of piles is a nebulous concept and a figment of the designer’s *** if it can be reasonably quantified,it has little,if any,significance to the performance of a pile in *** load carrying capacity of even low strength rock(in most situations)is far in excess of the strength of the structure(for example,a building column)transmitting the *** performance of a pile in rock is usually a displacement issue and is a function of rock mass stiffness rather than rock mass *** addition,poor pile performance is much more likely to result from poor construction practices than excessive displacement of the rock *** occur for footings that are undermined,or where unfavourable structure in the rock allows movement towards a free surface to ***,codes of practices,reference books and other sources of design information should focus foundation design in rock on displacement rather than strength *** investigations should measure rock mass stiffness and defect properties,as well as intact rock *** paper summarises the fundamental concepts relating to performance of piles in rock and provides a basis for displacement focused design of piles in *** also presents comments relating to how piles are modelled in widely used commercial finite element software for soil-structure interaction analysis,within the context of the back-analysis of a pile load test,and proposes recommendations for pile analysis and design.

关键词： Pile design Pile analysis Pile load test Finite element analysis

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Modular next generation fast-neutron detector for portal monitoring

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Nuclear Science and Techniques 2022年第1期33卷 140-148页

作者： e.Aboud S.Ahn G.V.Rogachev V.e.Johnson J.Bishop G.christian e.Koshchiy c.e.Parker D.P.Scriven cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA Department of Physics and Astronomy Texas A&M UniversityCollege StationTX 77843USA Department of Statistics Texas A&M UniversityCollege StationTX 77843USA

Nuclear nonproliferation is of critical importance for global *** fissile materials including highly enriched uranium and weapons-grade plutonium are especially important to *** interrogation techniques may result in much better sensitivity but are difficult with conventional portal monitors that rely on detecting thermal ***,most conventional portal monitoring systems rely on ^(3)He,which has a finite and continually decreasing *** designing a highly segmented array of organic scintillators,we posit that we can accurately and quickly identify fissile materials,including weapons-grade plutonium and highly enriched uranium,being *** propose a new design for a fast-neutron detector that overcomes the limitations of the current generation of portal ***6 simulations have been performed in conjunction with the UMPBT statistical model to determine the sensitivity limitations of the proposed *** suggest that the proposed detector may be 10 times more efficient than current-generation thermal neutron detectors and may be able to positively identify a 81 mg 235U source in as little as 192 seconds utilizing active interrogation techniques.

关键词： Fast-neutron detection Portal monitoring Nonproliferation

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Rapid Identification of Rice Samples Using an electronic Nose

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Journal of Bionic engineering 2009年第3期6卷 290-297页

作者： John Westbrook W.c.Hoffmann R.e.Lacey USDA-ARS College Station Department of Biological and Agricultural engineering Texas A&M UniversityCollege Station

Four rice samples of long grain type were tested using an electronic nose (cyranose-320).Samples of 5 g of each variety of rice were placed individually in vials and were analyzed with the electronic nose unit consisting of 32 polymer *** cyranose-320 was able to differentiate between varieties of *** chemical composition of the rice odors for differentiating rice samples needs to be *** optimum parameter settings should be considered during the cyranose-320 training process especially for multiple samples,which are helpful for obtaining an accurate training model to improve identification ***,it is necessary to investigate the e-nose sensor selection for obtaining better classification accuracy.A re- duced number of sensors could potentially shorten the data processing time,and could be used to establish an application pro- cedure and reduce the cost for a specific electronic *** research is needed for developing analytical procedures that adapt the cyranose-320 as a tool for testing rice quality.

关键词： rice grain identification electronic nose data analysis pattern recognition

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Strong Suppression of Systemic Acquired Resistance in Arabidopsis by NRR is Dependent on its Ability to Interact with NPRland its Putative Repression Domain

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Molecular Plant 2008年第3期1卷 552-559页

作者： Mawsheng chern Patrick e. canlas Pamela c. Ronald Department of Plant Pathology University of California Davis CA 95616 USA

Systemic Acquired Resistance （SAR） in plants confers lasting broad-spectrum resistance to pathogens and requires the phytohormone salicylic acid （SA）. Arabidopsis NPR1/NIM1 is a key regulator of the SAR response. Studies attempting to reveal the function of NPR1 and how it mediates SA signaling have led to isolation of two classes of proteins that interact with NPRI＂ the first class includes rice NRR, Arabidopsis NIMIN1, NIMIN2, and NIMIN3, and tobacco NIMIN2-1ike proteins; the second class belongs to TGA transcription factors. We have previously shown that overexpression of N RR in rice suppresses both basal and Xa21-mediated resistance. In order to test whether NRR affects SA-induced, NPRl-mediated SAR, we have transformed Arabidopsis with the rice NRR gene and tested its effects on the defense response. expression of NRR in Arabidopsis results in suppression of PR gene induction by SAR inducer and resistance to pathogens. These phenotypes are even more severe than those of the nprl-1 mutant. The ability of NRR to suppress PR gene induction and disease resistance is correlated with its ability to bind to NPR1 because two point mutations in NRR, which reduce NPR1 binding, fail to suppress NPR1. In contrast, wild-type and a mutant NRR, which still binds to NPR1 strongly, retain the ability to suppress the SAR response. Replacing the c-terminal 79 amino acids of NRR with the VP16 activation domain turns the fusion protein into a transcriptional co-activator. These results indicate that NRR binds to NPR1 in vivo in a protein complex to inhibit transcriptional activation of PR genes and that NRR contains a transcription repression domain for active repression.

关键词： NRR NPR1 SA SAR disease resistance.

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Fine structure and phase composition of Fe–14Mn–1.2c steel:influence of a modified mixture based on refractory metals

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International Journal of Minerals,metallurgy and Materials 2017年第5期24卷 523-529页

作者： anna Zykova Natalya Popova Mark Kalashnikov Irina Kurzina Tomsk Polytechnic University Tomsk State University of Architecture and Building chemical Department Tomsk State University

The effect of TiO;,ZrO;and Na;AlF;ultrafine powders on the fine structure and the phase composition of Fe–14Mn–1.2c steel was *** introduction of the ultrafine powders into the melt influenced the grain size,the quantity,and the character of distribution of nonmetallic inclusions in the railroad *** microstructure of castings was improved significantly because of the refinement of the grain structure and an increase of the grain-boundary *** the modifying mixture was introduced into the melt,either the microtwins of one or two intersecting systems or the precipitations of ε-martensite of different types,or simultaneously the microtwins and wafers of ε-martensite,were present in each grain.

关键词： manganese steel fine structure phase composition refractory metals

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Photonic crystal cavities and integrated optical devices

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Science china(Physics,mechanics & Astronomy) 2015年第11期58卷 11-22页

作者： gan Lin LI ZhiYuan Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences

This paper gives a brief introduction to our recent works on photonic crystal(Ph c) cavities and related integrated optical structures and devices. Theoretical background and numerical methods for simulation of Ph c cavities are first presented. Based on the theoretical basis, two relevant quantities, the cavity mode volume and the quality factor are discussed. Then the methods of fabrication and characterization of silicon Ph c slab cavities are introduced. Several types of Ph c cavities are presented, such as the usual L3 missing-hole cavity, the new concept waveguide-like parallel-hetero cavity, and the low-index nanobeam cavity. The advantages and disadvantages of each type of cavity are discussed. This will help the readers to decide which type of Ph c cavities to use in particular applications. Furthermore, several integrated optical devices based on Ph c cavities, such as optical filters, channel-drop filters, optical switches, and optical logic gates are described in both the working principle and operation characteristics. These devices designed and realized in our group demonstrate the wide range of applications of Ph c cavities and offer possible solutions to some integrated optical problems.

关键词： photonic crystal cavities optical filter optical switch optical logic gates

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All-electron basis sets for H to Xe specific for ZORA calculations:Applications in atoms and molecules

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chinese Physics B 2024年第8期33卷 238-246页

作者： c.S.Gomes F.e.Jorge A.canal Neto Departamento de Fisica Universidade Federal do Espirito Santo29075-910 VitoriaESBrazil Departamento de Fisica Instituto de Ciencias Exatas e BiologicasUniversidade Federal de Ouro Preto Campus Universitario Morro do Cruzeiro35402-136 Ouro PretoMGBrazil

A segmented basis set of quadruple zeta valence quality plus polarization functions(QZP)for H through Xe was developed to be used in conjunction with the ZORA *** set was augmented with diffuse functions to describe electrons farther away from the nuclei *** the ZORA-ccSD(T)/QZP-ZORA theoretical model,atomic ionization energies and bond lengths,harmonic vibrational frequencies,and atomization energies of some molecules were *** addition of core-valence corrections has been shown to improve the agreement between theoretical and experimental results for molecular *** atomization energies,a similar observation emerges when considering spin-orbit *** the augmented QZP-ZORA set,static mean dipole polarizabilities of a set of atoms were calculated and compared with previously published recommended and experimental *** evaluations of the ZORA and Douglas–Kroll–Hess Hamiltonians were made for each property studied.

关键词： QZP-ZORA and AQZP-ZORA basis sets elements from H to Xe ccSD(T)method atomic and molecular properties

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The chemistry of Fullerene-Mixed Peroxides

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chinese Journal of chemistry 2018年第11期36卷 991-994页

作者： Liangbing gan college of chemistry and Molecular engineering Peking University Bei- jing 200871 China

Peroxy radicals such as Bu t OO · add to fullerenes efficiently to form isomerically pure multiadducts, for example, c 60 (OOBu t ) 6 . The fullerene‐ mixed peroxides exhibit rich chemical reactivity. Further transformation of the peroxy groups has resulted in fullereneols, open‐cage fullerenes, aza‐ and oxafullerenes and/or fulleroids. Practical applications such as photoinitiator remain to be explored for these fullerene‐mixed peroxides.

关键词： peroxide fullerene heterofullerene open‐cage radical aromaticity

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Perception of artificial conspecifics by bearded dragons(Pogona vitticeps)

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Integrative Zoology 2019年第2期14卷 214-222页

作者： anna FROHNwieSeR Thomas W.PIKe John c.MURRAY anna WILKINSON School of Life Sciences University of LincolnLincolnUK School of computer Science University of LincolnLincolnUK Wildlife Research center Kyoto UniversityKyotoJapan

Artificial animals are increasingly used as conspecific stimuli in animal behavior ***,researchers often have an incomplete understanding of how the species under study perceives conspecifics,and,hence,which features are needed for a stimulus to be perceived *** investigate the features that bearded dragons(Pogona vitticeps)attend to,we measured their lateralized eye use when assessing a successive range of *** ranged through several stages of realism in artificial conspecifics,to see how features such as color,the presence of eyes,body shape and motion influence *** found differences in lateralized eye use depending on the sex of the observing bearded dragon and the artificial conspecific,as well as the artificial conspecific’s ***,this approach can inform the design of robotic animals that elicit biologically-meaningful responses in live animals.

关键词： bearded dragons conspecifics lateralized eye use perception

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^(13)c-methacetin breath test reproducibility study reveals persistent cYP1A2 stimulation on repeat examinations

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World Journal of Gastroenterology 2011年第45期17卷 4979-4986页

作者： anna Kasicka-Jonderko anna Nita Krzysztof Jonderko Magdalena Kamińska Barbara Bońska-Fajfrowska Department of Basic Biomedical Science School of Pharmacy Medical University of Silesia

AIM: To find the most reproducible quantitative parameter of a standard 13c-methacetin breath test (13c-MBT). meTHODS: Twenty healthy volunteers (10 female, 10 male) underwent the 13c-MBT after intake of 75 mg 13c-methacetin p.o. on three occasions. Short-and medium-term reproducibility was assessed with paired examinations taken at an interval of 2 and 18 d (medians), respectively. ReSULTS: The reproducibility of the 1-h cumulative 13c recovery (AUc0-60), characterized by a coefficient of variation of 10%, appeared to be considerably better than the reproducibility of the maximum momentary 13c recovery or the time of reaching it. Remarkably, as opposed to the short gap between consecutive examinations, the capacity of the liver to handle 13c-methacetin increased slightly but statistically significantly when a repeat dose was administered after two to three *** the AUc0-60, the magnitude of this fixed bias amounted to 7.5%. Neither the time gap between the repeat examinations nor the gender of the subjects affected the 13c-MBT reproducibility. cONcLUSION: 13c-MBT is most reproducibly quantified by the cumulative 13c recovery, but the exactitude thereof may be modestly affected by persistent stimulation of cYP1A2 on repeat examinations.

关键词： 13c-methacetin Breath test Isotope application in medicine Liver Reproducibility

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