794 research outputs found
Data from: Active normal faulting, diking, and doming above the rapidly inflating Laguna del Maule volcanic field, Chile imaged with CHIRP, magnetic, and focal mechanism data
No full textDana Peterson, Nicolas Garibaldi, Katie Keranen, Basil Tikoff, Craig Miller, Luis E. Lara, Andres Tassara, Clifford Thurber, Federica Lanza. (2020) Data from: Active normal faulting, diking, and doming above the rapidly inflating Laguna del Maule volcanic field, Chile imaged with CHIRP, magnetic, and focal mechanism data. Cornell University Library eCommons Repository. https://doi.org/10.7298/85gm-e119Data in support of the following research: The Laguna del Maule volcanic field (LdMVF) in Chile, a rapidly inflating silicic volcanic system without historical eruption, is intersected by active regional faults. The LdMVF provides an opportunity to observe how faults influence, accommodate, or are driven by an actively deforming large silicic system. Here we use Compressed High Intensity Radar Pulse (CHIRP) acoustic reflection data to map the fault network in sediments captured within the eponymous lake at the LdMVF, and combine our fault maps with the volcanic history, earthquake locations, focal mechanisms, and lacustrine magnetic data to interpret how faults and magmatism interact. Our seismic data image dominantly dip-slip faults forming grabens within the lake, subparallel to regional faults. No indications exist in the seismic data to suggest that fault patterns were created by the volcanic system, either ring or radial faults. Fault strikes interpreted from seismic and magnetic data are consistent with mapped dike and fault orientations on land. We therefore interpret that active faults at the LdMVF are tectonic rather than volcanic in origin, forming a transtensional zone that hosts the magmatic system. However, vertical motion along a NS-striking fault near the center of uplift suggests trapdoor-style faulting above the volcanic center in which tectonic faults are reactivated to accommodate magmatic inflation and overlying deformation. Magnetic anomalies follow regional faults, suggesting that faults also provide migration pathways. Depositional patterns indicate a prior episode of uplift followed by quiescence, indicating that significant magmatically related uplift at the LdMVF can occur without an associated major eruption
A Generalization of the Hamilton–Waterloo Problem on Complete Equipartite Graphs
No full textThe Hamilton–Waterloo problem asks for which s and r the complete graph Kn can be decomposed into s copies of a given 2-factor F1 and r copies of a given 2-factor F2 (and one copy of a 1-factor if n is even). In this paper, we generalize the problem to complete equipartite graphs K(n:m) and show that K(xyzw:m) can be decomposed into s copies of a 2-factor consisting of cycles of length xzm; and r copies of a 2-factor consisting of cycles of length yzm, whenever m is odd, s,r,≠1,gcd(x,z)=gcd(y,z) =1,and xyz≠ 0(mod4). We also give some more general constructions where the cycles in a given two factor may have different lengths. We use these constructions to find solutions to the Hamilton–Waterloo problem for complete graphs
On the Hamilton-Waterloo problem: the case of two cycles sizes of different parity
No full textThe Hamilton-Waterloo problem asks for a decomposition of the complete graph of order v into r copies of a 2-factor F1 and s copies of a 2-factor F2 such that r+s = v−1 2 . If F1 consists of m-cycles and F2 consists of n cycles, we say that a solution to (m, n)- HWP(v; r, s) exists. The goal is to find a decomposition for every possible pair (r, s). In this paper, we show that for odd x and y, there is a solution to (2kx, y)-HWP(vm; r, s) if gcd(x, y) ≥ 3, m ≥ 3, and both x and y divide v, except possibly when 1 ∈ {r, s}
Analyses of hadronic events with missing energy and momentum for Higgs boson searches in DELPHI data at E_c.m.=161 and 172 GeV
No full textThe Hamilton-Waterloo Problem with 4-Cycles and a Single Factor of n-Cycles
No full textA 2-factor in a graph G is a 2-regular spanning subgraph of G, and a 2-factorization of G is a decomposition of all the edges of G into edge-disjoint 2-factors. A {Cmr, Cns}-factorization of Kυasks for a 2-factorization of Kυ, where r of the 2-factors consists of m-cycles, and s of the 2-factors consists of n-cycles. This is a case of the Hamilton-Waterloo problem with uniform cycle sizes m and n. If υ is even, then it is a decomposition of Kυ- F where a 1-factor F is removed from Kυ. We present necessary and sufficient conditions for the existence of a {C4r, Cn1}-factorization of Kυ- F
Use of DELPHI photon hermeticity instrumentation in hadronic events at LEP2
No full textAn algorithm to utilize the DELPHI photon hermeticity instruments in hadronic events at LEP2 energies is described. 1 Introduction Energetic photons are often radiated in annihilation events at LEP2. While the initial state radiation (ISR) dominates the photon flux in the beam directions, nonnegligible fractions of ISR and final state radiation (FSR), are distributed in the detector acceptance. It is important to detect this fraction at a maximal e#ciency (photon hermeticity), especially in analyses that exploit the missing energy and momentum signature. An unobserved photon in the detector acceptance imitates a missing particle i.e. generates missing transverse momentum, and acoplanarity in the recoiling particle system. The missing mass is typically low in the case of single photon radiation, but may get increased up by additional photon radiation, or by energy losses in the visible system. Such events appear as background in searches for missing heavy particles. The main parts of..
The Ability of Cyanobacterial Cells to Restore UV-B Radiation Induced Damage to Photosystem II is Influenced by Photolyase Dependent DNA Repair
No full textDamage of DNA and Photosystem-II are among the most significant effects of UV-B irradiation in photosynthetic organisms. Both damaged DNA and Photosystem-II can be repaired, which represent important defense mechanisms against detrimental UV-B effects. Correlation of Photosystem-II damage and repair with the concurrent DNA damage and repair was investigated in the cyanobacterium Synechocystis PCC6803 using its wild type and a photolyase deficient mutant, which is unable to repair UV-B induced DNA damages. A significant amount of damaged DNA accumulated during UV-B exposure in the photolyase mutant concomitant with decreased Photosystem-II activity and D1 protein amount. The transcript level of psbA3, which is a UV-responsive copy of the psbA gene family encoding the D1 subunit of the Photosystem-II reaction center, is also decreased in the photolyase mutant. The wild-type cells, however, did not accumulate damaged DNA during UV-B exposure, suffered smaller losses of Photosystem-II activity and D1 protein, and maintained higher level of psbA3 transcripts than the photolyase mutant. It is concluded that the repair capacity of Photosystem-II depends on the ability of cells to repair UV-B-damaged DNA through maintaining the transcription of genes, which are essential for protein synthesis-dependent repair of the Photosystem-II reaction center
A Direct measurement of : at a future linear collider
No full textThe experimental sensitivity of the reaction has been studied with a full-statistics background simulation for sqrt(s) = 500 GeV and L = 500 fb. The simulation is based on a fast and realistic simulation of a TESLA detector. For the first time this reaction has been analysed for a future linear collider and we show that a signal could be observed. A significant signal over background is achieved by the application of an Iterative Discriminant Analysis (IDA). For a signal production cross section of only 2 fb, which is expected for a Higgs boson mass of 100 GeV and , we achieve 100 signal over 100 background events, and obtain for a measurement: . This measurement requires a high-luminosity future collider as proposed in the TESLA project
Running quark mass effects in PYTHIA
No full textThe PYTHIA MC program is known to give a too low 3-jet rate for primary bquarks and a too low gluon splitting rate into heavy quarks. It is shown that replacing the pole masses of the b- and c-quarks used for calculating the thresholds in PYTHIA (5.0 and 1.35 GeV, respectively) by effective masses of 3.5 and 0.85 GeV in PYTHIA brings the MC predictions of the rates mentioned above in good agreement with data. These effective masses are close to the running masses at the average Q 2 of the gluons splitting into heavy quarks. 1 Introduction Mass effects in the 3-jet rate and in the gluon splitting into heavy quarks can be reliably calculated in QCD, since they are free from infrared divergencies. The question is really, what mass one should use. From our 3-jet rate with primary b-quarks[1] we determined the effective b-mass in NLO to be m b (MZ ) = 2:67 \Sigma 0:25 \Sigma 0:34 \Sigma 0:27 GeV, which is significantly smaller than the pole mass of 5 GeV used in PYTHIA[2]. However, it ..
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