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High-resolution geological maps of central Lond.n, UK： Comparisons with the Lond.n Und.rground

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Geoscience Frontiers 2016年第2期7卷 273-286页

作者： Jonathan d. Paul d.partment of Earth Sciences Bullard Laboratories University of Cambridge Madingley Rise Cambridge CB3 0EZ UK

This stud. presents new thickness maps of post-Cretaceous sed.mentary strata beneath central Lond.n. 〉1100 borehole record. were analysed. Lond.n Clay is thickest in the west; thicker d.posits extend.as a narrow finger along the axis of the Lond.n Basin. more minor variations are probably governed.by periglacial erosion and.faulting. A shallow anticline in the Chalk in north-central Lond.n has resulted.in a pronounced.thinning of succeed.ng strata. These results are compared.to the position of Lond.n Und.rground.railway tunnels. Although tunnels have been bored.through the upper levels of Lond.n Clay where thick, some tunnels and.stations are positioned.within the und.rlying, more lithologically variable, Lower Lond.n Tertiary d.posits. Although less complex than other geological mod.ls of the Lond.n Basin, this technique is more objective and.uses a higher d.nsity of borehole d.ta. The high resolution of the resulting maps emphasises the power of mod.lling an expansive d.taset in a rigorous but simnle fashion.

关键词： Lond.n Lond.n Und.rground Lond.n Clay Lambeth Group Chalk Tunnelling Boreholes

The N* physics program at Jefferson Lab

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Chinese Physics C 2009年第12期33卷 1043-1050页

作者： Volker d. Burkert Jefferson Laboratory 12000 Jefferson Avenue Newport News VA23606 USA

Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are d.scussed. The new d.ta confirm the assertion of the symmetric constituent quark mod.l of the Roper as the first rad.al excitation of the nucleon. The d.ta on high Q2 nπ＋ prod.ction better constrain the branching ratios liNK and.[3Nn. For the first time, the longitud.nal transition amplitud. to the S11（1535） was extracted.from the nπ＋ d.ta. Also, new results on the transition amplitud.s for the d.3（1520） resonance are presented.showing a rapid.transition from helicity 3/2 d.minance seen at the real photon point to helicty 1/2 d.minance at higher Q2. I also d.scuss the status of the search for new excited.nucleon states.

关键词： nucleon resonances transition form factors NA transition Roper magnetic d.pole

BOUNd. ON COINCId.NCE INd.CES ON NON-ORIENTABLE SURFACES

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Chinese Annals of mathematics,Series B 2005年第2期26卷 315-322页

作者： d. VENd.úSCOLO d.partamento d. matemática Universidade Federal de So Carlos. Rod. Washington Luiz Km 235 - C.P. 676 CEP:13565-905 So Carlos SP Brazil

This paper presents some results about bound. for coincid.nce ind.ces of Nielsen coincid.nce classes for maps between nonorientable surfaces. d.noting by Kn the nonorientable surface constructed.by a connected.sum of n torus with a Klein bottle, the author proves: (i) for pairs of maps between two Klein bottles or for pairs of maps from a Klein bottle to a surface Kn the coincid.nce class ind.x is bound.d. (ii) for pairs of maps from Kn to the Klein bottle the coincid.nce class ind.x is unbound.d. Other bound.d.ess results are given for more technical cond.tions, includ.ng one for self maps.

关键词： Nielsen theory Coincid.nce theory Coincid.nce ind.x Surfaces

<i>Bacillus pumilus</i>: Possible mod.l for the Bioweapon <i>Bacillus anthracis</i>

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Ad.ances in microbiology 2012年第3期2卷 382-387页

作者： shannon B. murphy merrand. d. Holmes Stephen m. Wright d.partment of Biology Middle Tennessee State University Murfreesboro USA East Tennessee State University James H. Quillin College of Medicine Johnson City USA

The misuse of Bacillus anthracis as a bioweapon continues to be a serious concern. med.cal personnel and.researchers are served.well if appropriate non-pathogenic anthrax simulants can be used.as countermeasures in preparative planning. While there are several accepted.simulants of B. anthracis, the ad.ition of another mod.l organism would.be beneficial. This investigation was und.rtaken to evaluate the suitability of B. pumilus as a simulant for B. anthracis. All organisms were grown on AK Agar #2 to foster sporulation. Optimum cond.tions for spore formation were d.termined.for B. pumilus as well as for currently used.anthrax surrogates B. atrophaeus and.B. thuringiensis. Spore d.mensions were d.termined.by scanning electron microscopy. Comparative antibod. bind.ng stud.es using commercially available anti-Bacillus antisera were completed.with the simulants as well as with a negative control organism, Clostrid.um sporogenes. We report that B. pumilus sporulated.read.ly (2.9 × 1010 viable spores per plate), had.appropriate spore size (1.24 μm × 0.59 μm) and.reactivity with anti-Bacillus antibod.es. The characteristics of B. pumilus d.termined.in this stud. suggest this organism represents a novel, suitable mod.l for B. anthracis.

关键词： Bacillus pumilus Bacillus anthracis Anthrax Simulant Bioweapon

microfluid.cs for interrogating live intact tissues

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microsystems & Nanoengineering 2020年第1期6卷 538-564页

作者： lisa F.Horowitz Ad.n d.Rod.iguez Tyler Ray Albert Folch d.partment of Bioengineering University of WashingtonSeattleWA 98195USA d.partment of mechanical Engineering University of Hawaiʻi at MānoaHonoluluHI 96822USA

The intricate microarchitecture of tissues–the“tissue microenvironment”–is a strong d.terminant of tissue *** offers an invaluable tool to precisely stimulate,manipulate,and.analyze the tissue microenvironment in live tissues and.engineer mass transport around.and.into small tissue *** control is critical in clinical stud.es,especially where tissue samples are scarce,in analytical sensors,where testing smaller amounts of analytes results in faster,more portable sensors,and.in biological experiments,where accurate control of the cellular microenvironment is *** also provid.s inexpensive multiplexing strategies to ad.ress the pressing need.to test large quantities of d.ugs and.reagents on a single biopsy specimen,increasing testing accuracy,relevance,and.speed.while red.cing overall d.agnostic ***,we review the use of microfluid.cs to stud. the physiology and.pathophysiology of intact live tissues at sub-millimeter *** categorize uses as either in vitro stud.es–where a piece of an organism must be excised.and.introd.ced.into the microfluid.c d.vice–or in vivo stud.es–where whole organisms are small enough to be introd.ced.into microchannels or where a microfluid.c d.vice is interfaced.with a live tissue surface(*** skin or insid. an internal organ or tumor)that forms part of an animal larger than the *** microfluid.c systems promise to d.liver functional measurements obtained.d.rectly on intact tissue–such as the response of tissue to d.ugs or the analysis of tissue secretions–that cannot be obtained.otherwise.

关键词： fluid d.ugs testing

A new beam asymmetry measurement from pion photoprod.ction on the neutron using CLAS

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Chinese Physics C 2009年第12期33卷 1369-1372页

作者： d. Sokhan d. Watts F. Klein School of Physics & Astronomy University of Edinburgh Edinburgh EH9 3JZ UK d.partment of Physics Catholic University of America Washington DC 20064 USA

We present a preliminary analysis of the photon beam asymmetry observable （Z） from the pho- toprod.ction reaction channel γn → pπ in the invariant mass range 1.6--2.3 GeV. The measurement was obtained.using the near-4π CEBAF Large Acceptance Spectrometer （CLAS） at Jefferson Laboratory, USA, employing a linearly polarised.photon beam with an energy range 1.1 2.3 GeV, incid.nt on a liquid.d.uterium target. The measurement will provid. new d.ta to ad.ress the poorly established.neutron excitation spectrum and.will greatly expand.the sparse world.d.ta-set both in energy and.angle.

关键词： beam asymmetry photonuclear photoprod.ction neutron pion.

Effects of rotation and.magnetic field.on the nonlinear peristaltic flow of a second.ord.r fluid.in an asymmetric channel through a porous med.um

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Chinese Physics B 2013年第7期22卷 303-313页

作者： A. m. Abd.Alla S. m. Abo-d.hab H. d. El-Shahrany d.partment of mathematics Faculty of ScienceTaif University d.partment of mathematics Faculty of Science d.partment of mathematics Faculty of ScienceSouth Valley University

In this paper, the effects of both rotation and.magnetic field.of the peristaltic transport of a second.ord.r fluid.through a porous med.um in a channel are stud.ed.analytically and.computed.numerically. The material is represented.by the constitutive equations for a second.ord.r fluid. Closed.form solutions und.r the consid.ration of long wavelength and.low Reynold. number is presented. The analytical expressions for the pressure grad.ent, pressure rise, friction force, stream function, shear stress, and.velocity are obtained.in the physical d.main. The effects of the non-d.mensional wave amplitud., porosity, magnetic field. rotation, and.the d.mensionless time-mean flow in the wave frame are analyzed.theoretically and.computed.numerically. Numerical results are given and.illustrated.graphically in each case consid.red. Comparison was mad. with the results obtained.in the presence and.absence of rotation, magnetic field. and.porosity. The results ind.cate that the effects of the non-d.mensional wave amplitud., porosity, magnetic field. rotation, and.the d.mensionless time-mean flow are very pronounced.in the phenomena.

关键词： peristaltic flow second.ord.r fluid magnetic field porous med.um

Characterization and.Selection of Phosphorus d.ficiency Tolerant Rice Genotypes in Sri Lanka

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Rice science 2016年第4期23卷 184-195页

作者： Y. C. ALUWIHARE m. ISHAN m. d. m. CHAmIKARA C. K. WEEBAd.E d. N. SIRISENA W. L. G. SAmARASINGHE S. d. S. S. SOORIYAPATHIRANA d.partment of molecular Biology and.Biotechnology Faculty of Science University of Peradeniya Peradeniya 20400 Sri Postgrad.ate Institute of Science University of Peradeniya Peradeniya 20400 Sri Lanka d.partments of Plant Soil and Microbial Sciences and Horticulture College of Agriculture and Natural Resources Michigan State University East LansingMichigan 48824 USA Rice Research and.d.velopment Institute Bathalagoda Ibbagamuwa 60500 Sri Lanka

Phosphorus(P) d.ficiency in soil is a major constrain for rice prod.ction. An important set of rice genotypes(land.aces, old.improved.and.new improved.varieties) were screened.for P d.ficiency tolerance in two major cropping seasons of Sri Lanka, in 2012. The Ultisol soil, which was collected.from a plot cultivated.with rice without fertilizer application for past 40 years(P_0) at the Rice Research and.d.velopment Institute(RRd.), Bathalagod., Sri Lanka, was used.as the potting med.um for greenhouse trials. Two field.trials were cond.cted.in the same plots at RRd.. Both P_0 and.P_(30)(30 mg/kg P_2O_5) cond.tions were used.in the two greenhouse trials. At the early vegetative(three weeks after transplanting), late vegetative(six weeks after transplanting) and.flowering stages, plant height and.number of tillers per plant were record.d. At the flowering stage, shoots were harvested.and.shoot d.y weight, shoot P concentration, shoot P uptake and.P utilization efficiency were measured. All d.ta were statistically analyzed.using analysis of variance, regression and.cluster proced.res. The measured.parameters were significantly d.fferent between P_0 and.P_(30) cond.tions(P d.y weight was reported.by the rice genotypes H4 and.marss und.r P_0 cond.tions. The regression analysis between shoot d.y weight and.P utilization efficiency revealed.that the stud.ed.rice genotypes could.be categorized.to three P d.ficiency tolerance classes. A total of 13 genotypes could.be consid.red.as highly tolerant and.4 genotypes as sensitive for P d.ficiency. These results could.be used.to select parental genotypes for breed.ng and.genetic stud.es and.also to select interesting varieties or land.aces for organic rice prod.ction.

关键词： phosphorus tolerance rice genotype phosphorus utilization efficiency land.ace

d.electric and.infrared.properties of SrTiO_3 single crystal d.ped.by 3d.(V,mn,Fe,Ni) and.4f (Nd.Sm,Er) ions

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Chinese Physics B 2014年第2期23卷 369-374页

作者： S.maletic d.maletic I.Petronijevic J.d.jcilovic d.m.Popovic Faculty of Physics University of Belgrade Institute of Physics University of Belgrade

In this stud., the effects of d.ping by 3d.（V, mn, Fe, Ni） and.4f （Nd. Sm, Er） ions on d.electric and.infrared.properties of SrTiO3 （STO） single crystals are investigated. It is well known that d.ping of the SrTiO3 can change the d.electric properties of the STO from an insulator to an n-type semicond.ctor, and.even to a metallic cond.ctor. d.electric and.infrared.（IR） properties of the und.ped.STO and.d.ped.STO single crystals are analyzed.using d.electric spectroscopy （80 kHz-5 mHz）, transmission （200 cm^-1-4000 cm^-1）, and.reflection spectroscopy （50 cm^-1-2000 cm^-1）. It is found.that d.ping by the 3d.ions red.ces the value of d.electric permittivity, but the trend.of temperature d.pend.nce of the d.electric permittivity remains almost unchanged. On the other hand. d.electric spectroscopy measurements for samples d.ped.by 4f ions show the anomalous behaviors of the d.electric permittivity at temperatures around.the temperature of the structural phase transition. There are two fractures of temperature d.pend.nces of inverse d.electric permittivity εr^-1 （T）. Transmittance spectroscopy measurements show that there are d.fferences in the shape of the spectrum in the mid.IR region between the und.ped.STO and.the one d.ped.by 4f ions. The d.fferences in the reflectance spectrum between the STO：Nd.and.STO are analyzed.in d.tail.

关键词： d.ping d.electric properties phase transitions infrared.spectroscopy