23 research outputs found
Development of a low actuation voltage RF MEMS switch
This paper reports on the design of a novel ultra low actuation voltage, low loss radio frequency micro-electro-mechanical system (RF MEMS) capacitive shunt switch. The concept of the switch relies on a mechanically unconstrained armature actuated over a coplanar waveguide using electrostatic forces. The minimum actuation voltage of the switch is <2V, with an isolation of 40dB and insertion loss <0.7dB at 78GHz
Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter
Climate change and human pressures are changing the global distribution and the ex‐
tent of intermittent rivers and ephemeral streams (IRES), which comprise half of the
global river network area. IRES are characterized by periods of flow cessation, during
which channel substrates accumulate and undergo physico‐chemical changes (precon‐
ditioning), and periods of flow resumption, when these substrates are rewetted and
release pulses of dissolved nutrients and organic matter (OM). However, there are no
estimates of the amounts and quality of leached substances, nor is there information
on the underlying environmental constraints operating at the global scale. We experi‐
mentally simulated, under standard laboratory conditions, rewetting of leaves, river‐
bed sediments, and epilithic biofilms collected during the dry phase across 205 IRES
from five major climate zones. We determined the amounts and qualitative character‐
istics of the leached nutrients and OM, and estimated their areal fluxes from riverbeds.
In addition, we evaluated the variance in leachate characteristics in relation to selected
environmental variables and substrate characteristics. We found that sediments, due
to their large quantities within riverbeds, contribute most to the overall flux of dis‐
solved substances during rewetting events (56%–98%), and that flux rates distinctly
differ among climate zones. Dissolved organic carbon, phenolics, and nitrate contrib‐
uted most to the areal fluxes. The largest amounts of leached substances were found
in the continental climate zone, coinciding with the lowest potential bioavailability of
the leached OM. The opposite pattern was found in the arid zone. Environmental vari‐
ables expected to be modified under climate change (i.e. potential evapotranspiration,
aridity, dry period duration, land use) were correlated with the amount of leached sub‐
stances, with the strongest relationship found for sediments. These results show that
the role of IRES should be accounted for in global biogeochemical cycles, especially
because prevalence of IRES will increase due to increasing severity of drying event
Long-range Angular Correlations On The Near And Away Side In P-pb Collisions At √snn=5.02 Tev
7191/Mar294
Identifying the major intermediate species by combining time-resolved X-ray solution scattering and X-ray absorption spectroscopy
Identifying the intermediate species along a reaction pathway is a first
step towards a complete understanding of the reaction mechanism, but
often this task is not trivial. There has been a strong on-going debate:
which of the three intermediates, the CHI2 radical, the CHI2–I isomer,
and the CHI2
+ ion, is the dominant intermediate species formed in the
photolysis of iodoform (CHI3)? Herein, by combining time-resolved
X-ray liquidography (TRXL) and time-resolved X-ray absorption
spectroscopy (TR-XAS), we present strong evidence that the CHI2
radical is dominantly formed fromthe photolysis of CHI3 in methanol
at 267 nm within the available time resolution of the techniques
(B20 ps for TRXL andB100 ps for TR-XAS). The TRXL measurement,
conducted using the time-slicing scheme, detected no CHI2–I isomer
within our signal-to-noise ratio, indicating that, if formed, the CHI2–I
isomer must be a minor intermediate. The TR-XAS transient spectra
measured at the iodine L1 and L3 edges support the same conclusion.
The present work demonstrates that the application of these two
complementary time-resolved X-ray methods to the same system can
provide a detailed understanding of the reaction mechanism. © the Owner Societies 20151341sciescopu
Vertical Product Differentiation, Entry-Deterrence Strategies, and Entry Qualities
We analyze the potential entry of a new product into a vertically differentiated market. Here the entry-deterrence strategies of the incumbent firm rely on “limit qualities.” The model assumes quality-dependent marginal production costs and considers sequential quality choices by an incumbent and an entrant. Entry-quality decisions and the entry-deterrence strategies are related to the fixed cost necessary for entry and to the degree of consumers’ taste for quality. We detail the conditions under which the incumbent increases its quality level to deter entry. Quality-dependent marginal production costs in the model entail the possibility of inferior-quality entry as well. Welfare is not necessarily improved when entry is encouraged rather than deterred. Copyright Springer Science+Business Media, LLC 2006Entry deterrence, Quality choice, Stackelberg duopoly, Vertical product differentiation,