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The DIS diffractive cross section, dσ γ∗p→XN/dMX , has been measured in the mass range MX < 15 GeV for γ p c.m. energies 60 < W < 200 GeV and photon virtualities Q2 = 7 to 140 GeV2. For fixed Q2 and MX , the diffractive cross section rises rapidly with W , dσ γ∗p→XN(MX ,W,Q )/dMX ∝ W a with adiff = 0.507 ± 0.034(stat) −0.046(syst) corresponding to a t-averaged pomeron trajectory of α IP = 1.127...
This report evaluates a vacuum-assisted walled percolation sampler preconditioned in soil, and examines the dynamic response of leachate solutes. The 20-cm walled percolation sampler extracted soil water under continuous tension via a ceramic cup collector embedded in a silica flour layer, whose upper surface interfaced with field soil. In the laboratory, alternating solutions with high and low...
Elastic ρ photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from ep interactions were used to measure the reaction γp → ρp (ρ → π+π−) at photon-proton centre-of-mass energies between 60 and 80 GeV and |t| < 0.5 GeV, where t is the square of the four-momentum transferred at the proton vertex. The differential cross section dσ/dMππ , where Mππ is t...
A measurement is presented of the cross section for meson production in diffractive deep–inelastic scattering for the first time at HERA. The cross section is given for the process , where the system contains at least one meson and is separated by a large rapidity gap from a low mass proton remnant system . The cross section is presented in the diffractive deep–inelastic region defined by ! "# ...
Corridors are commonly used to connect fragments of wildlife habitat, yet the identification of conservation corridors typically neglects processes of habitat selection and movement for target organisms. Instead, corridor designs often are based on binary patterns of habitat suitability. New technologies and analytical tools make it possible to better integrate landscape patterns with behaviora...
Unlike classical end-point analysis PCR, real-time PCR provides the data required for quantification of the target nucleic acid. The results can be expressed in absolute terms by reference to external quantified standards or in relative terms compared to another target sequence present within the sample. Absolute quantification requires that the efficiency of the amplification reaction is the s...
An intensive monitoring was carried out between June and September 2002 in different passage types across a highway in NW Spain in order to determine their use by terrestrial vertebrates. We used marble dust-beds to get footprints and a complementary photographic system to identify species which cannot be distinguished by tracks. Footprint data (820 passage-days) were collected from 82 passage ...
Deep-inelastic ep scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening, jet mass, C parameter and two kinds of differential two-jet rate. The data cover a large range of the four-momentum transfer Q, which is considered to be the relevant energy scale, between 7GeV and 100GeV. The Q dependences of the mean values are compared wi...
The production of hard di-jet events in photoproduction at HERA is dominated by resolved photon processes in which a parton in the photon with momentum fraction is scattered from a parton in the proton. These processes are sensitive to the quark and gluon content of the photon. The differential di-jet cross-section is presented here, measured in tagged photoproduction at HERA using data taken w...
The elastic electroproduction of mesons is studied at HERA with the H1 detector for photon virtualities and hadronic centre of mass energies GeV. The and dependences of the cross section are extracted ( being the square of the four-momentum transfer to the target proton). When plotted as function of ( + ) and scaled by the appropriate SU(5) quark charge factor, the meson cross section agrees wi...
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