7,551 research outputs found
Contributions to the flora and vegetation of Kagbeni (Mustan District, Central Nepal)
Kagbeni and its irrigated oasis are surrounded by subdesert dwarf scrubland. In the present study, a list of 78 species of vascular plants is presented for Kagbeni and its immediate surroundings, supplemented with data on the distribution of the species within the entire Mustan District. The data are arrived from own investigations and the geobotanical literature. A phytogeographical analysis shows the prevalence of western over eastern elements. Species with a wide distribution in Eurasia, which constitute one third of the total flora of Kagbeni, are of great importance as weeds on arable fields and in ruderal places within the irrigated oasis. Their occurrence is closely related to human activity. Presumably, most of these weeds have reached the area under study in connection with agriculture a long time ago. Weeds from the New World, although recorded in other villages of Mustan District, have not been found in Kagbeni. The weed vegetation of Kagbeni is documented by nine vegetation releves, and is compared to releves from Jomsom and Mzrpha. A floristic gradient from south to north that has been detected by earlier investigations throughout the whole district can be reproduced at the local scale. With regard to the weed flora, the effects of different crops are minimal, compared to effects of altitude and other factors related to altitude
Isolated tau leptons in events with large missing transverse momentum at HERA
A search for events containing isolated tau leptons and large missing
transverse momentum, not originating from the tau decay, has been performed
with the ZEUS detector at the electron-proton collider HERA, using 130 pb^-1 of
integrated luminosity. A search was made for isolated tracks coming from
hadronic tau decays. Observables based on the internal jet structure were
exploited to discriminate between tau decays and quark- or gluon-induced jets.
Three tau candidates were found, while 0.40 +0.12 -0.13 were expected from
Standard Model processes, such as charged current deep inelastic scattering and
single W-boson production. To search for heavy-particle decays, a more
restrictive selection was applied to isolate tau leptons produced together with
a hadronic final state with high transverse momentum. Two candidate events
survive, while 0.20 +-0.05 events are expected from Standard Model processes.Comment: 28 pages, 4 figures, 3 tables, accepted by Phys. Lett. B. Updated
with minor changes to the text requested by the journal refere
Observation of Scaling Violations in Scaled Momentum Distributions at HERA
Charged particle production has been measured in deep inelastic scattering
(DIS) events over a large range of and using the ZEUS detector. The
evolution of the scaled momentum, , with in the range 10 to 1280
, has been investigated in the current fragmentation region of the Breit
frame. The results show clear evidence, in a single experiment, for scaling
violations in scaled momenta as a function of .Comment: 21 pages including 4 figures, to be published in Physics Letters B.
Two references adde
Predictors of potentially harmful behaviour by family caregivers towards patients treated for behavioural and psychological symptoms of dementia in Japan
13301甲第4798号博士(保健学)金沢大学博士論文要旨Abstract 要約Outline 以下に掲載:Psychogeriatrics 18(5) pp.357-364 2018. Japanese Psychogeriatric Society. 共著者:Toda D, Tsukasaki K, Itatani T, Kyota K, Hino S, Kitamura
Magnetic Field Uniformity Across the GF 9-2 YSO, L1082C Dense Core, and GF 9 Filamentary Dark Cloud
The orientation of the magnetic field (B-field) in the filamentary dark cloud
GF 9 was traced from the periphery of the cloud into the L1082C dense core that
contains the low-mass, low-luminosity Class 0 young stellar object (YSO) GF 9-2
(IRAS 20503+6006). This was done using SOFIA HAWC+ dust thermal emission
polarimetry (TEP) at 216 um in combination with Mimir near-infrared background
starlight polarimetry (BSP) conducted at H-band (1.6 um) and K-band (2.2 um).
These observations were augmented with published I-band (0.77 um) BSP and
Planck 850 um TEP to probe B-field orientations with offset from the YSO in a
range spanning 6000 AU to 3 pc. No strong B-field orientation change with
offset was found, indicating remarkable uniformity of the B-field from the
cloud edge to the YSO environs. This finding disagrees with weak-field models
of cloud core and YSO formation. The continuity of inferred B-field
orientations for both TEP and BSP probes is strong evidence that both are
sampling a common B-field that uniformly threads the cloud, core, and YSO
region. Bayesian analysis of Gaia DR2 stars matched to the Mimir BSP stars
finds a distance to GF 9 of 270 +/- 10 pc. No strong wavelength dependence of
B-field orientation angle was found, contrary to previous claims.Comment: 18 pages, 6 figures ApJ, accepte
Possible Excess in Charged Current Events with High-Q^2 at HERA from Stop and Sbottom Production
We investigate a production process e^+p \to \st X \to \sb W^+ X at HERA,
where we consider a decay mode \sb \to \bar{\nu}_e d of the sbottom in the
framework of an R-parity breaking supersymmetric standard model. Both processes
of the stop production e^+ d \to \st and the sbottom decay \sb \to
\bar{\nu}_e d are originated from an R-parity breaking superpotential
. One of signatures of the
process should be a large missing transverse momentum plus multijet events
corresponding to hadronic decays of the . It is shown that the signal could
appear as an event excess in the charged current (CC) processes with the high at HERA. We compare expected event distributions with
the CC data recently reported by the H1 and ZEUS groups at HERA. Methods for
extracting the signal from the standard CC processes are also discussed.Comment: 13 pages, LaTeX, 3 figure
Warm Extended Dense Gas Lurking At The Heart Of A Cold Collapsing Dense Core
In order to investigate when and how the birth of a protostellar core occurs,
we made survey observations of four well-studied dense cores in the Taurus
molecular cloud using CO transitions in submillimeter bands. We report here the
detection of unexpectedly warm (~ 30 - 70 K), extended (radius of ~ 2400 AU),
dense (a few times 10^{5} cm^{-3}) gas at the heart of one of the dense cores,
L1521F (MC27), within the cold dynamically collapsing components. We argue that
the detected warm, extended, dense gas may originate from shock regions caused
by collisions between the dynamically collapsing components and
outflowing/rotating components within the dense core. We propose a new stage of
star formation, "warm-in-cold core stage (WICCS)", i.e., the cold collapsing
envelope encases the warm extended dense gas at the center due to the formation
of a protostellar core. WICCS would constitutes a missing link in evolution
between a cold quiescent starless core and a young protostar in class 0 stage
that has a large-scale bipolar outflow.Comment: Accepted for publication in The Astrophysical Journal Letter
183 GHz HO maser emission around the low-mass protostar Serpens SMM1
We report the first interferomteric detection of 183 GHz water emission in
the low-mass protostar Serpens SMM1 using the Submillimeter Array with a
resolution of 3 and rms of 7 Jy in a 3 km s bin. Due to the
small size and high brightnessof more than 240 Jy/beam, it appears to be maser
emission. In total three maser spots were detected out to 700 AU from
the central protostar, lying along the red-shifted outflow axis, outside the
circumstellar disk but within the envelope region as evidenced by the continuum
measurements. Two of the maser spots appear to be blue-shifted by about 1 to 2
km s. No extended or compact thermal emission from a passively heated
protostellar envelope was detected with a limit of 7 Jy (16 K), in agreement
with recent modelling efforts. We propose that the maser spots originate within
the cavity walls due to the interaction of the outflow jet with the surrounding
protostellar envelope. Hydrodynamical models predict that such regions can be
dense and warm enough to invert the 183 GHz water transition.Comment: Accepted for ApJ letters, 2 figure
Orbital Floquet Engineering of Exchange Interactions in Magnetic Materials
We present a new scheme to control the spin exchange interactions between two
magnetic ions by manipulating the orbital degrees of freedom using a periodic
drive. We discuss two different protocols for orbital Floquet engineering. In
one case, we modify the properties of the ligand orbitals which mediate
magnetic interactions between two transition metal ions. While in the other
case, we mix the d orbitals on each magnetic ion. In contrast to previous works
on Floquet engineering of magnetic properties, the present scheme makes use of
the AC Stark shift of the states involved in the exchange process
Supersymmetry and Charged Current Events at HERA
A light stop, with an R-parity-violating coupling , has been
suggested as an explanation of the excess in high- neutral current events
observed at the HERA collider. We show that in this scheme a corresponding
excess in charged current events --- such as that reported by the H1
Collaboration --- can appear naturally, without calling for the presence of
light sleptons or additional R-parity-violating couplings, if there exists a
chargino lighter than the stop. The predicted event shapes agree well with the
data. The relevant region of parameter space is identified, taking into account
constraints coming from precision electroweak measurements, atomic parity
violation and recent searches for first-generation leptoquarks at the Tevatron
collider.Comment: 18 pages, LaTeX, 4 embedded figure
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