90,216 research outputs found
Migrant and non-migrant domestic workers in Hanoi: the segmentation of domestic service
Nguyen M. Migrants and Non-migrant Domestic Workers in Hanoi. The Segmentation of Domestic Service. DEV Working Paper Series. Vol 22. Norwich: School of International Development, UEA; 2010
THE YIELD CURVE AS A LEADING INDICATOR ACROSS COUNTRIES AND TIME: THE EUROPEAN CASE
With the increasing demand for a better understanding about the relationship between yield curve and economic activities, this paper analyzes the data sets of seven countries in the European Union: Germany, France, Belgium, Spain, the United Kingdom, Sweden and Poland using quantitative analytical method. Based on previous literature, the expected hypothesis is: there is a strong relationship between the yield curve and the chance of an incoming economic contraction. The inverted yield curve, or the negative yield curve spread is considered as the tool to forecast the incoming contraction. Having been used as a rule of thumb for future reference of a contraction, whether yield curve and interest rates can be an accurate tool to predict the movement of business cycles should be studied more thoroughly, which will help not only the governments to reduce the loss from recession, but also equip financial sector valuable information to adjust itself before a contraction takes place. Further findings in this paper present a comparison between a group of Eurozone members and a group of non-Eurozone members. The similarities and differences give a broad idea of how the creation of the Eurozone has affected the area in the last decade
Phase ambiguity resolution for offset QPSK modulation systems
A demodulator for Offset Quaternary Phase Shift Keyed (OQPSK) signals modulated with two words resolves eight possible combinations of phase ambiguity which may produce data error by first processing received I(sub R) and Q(sub R) data in an integrated carrier loop/symbol synchronizer using a digital Costas loop with matched filters for correcting four of eight possible phase lock errors, and then the remaining four using a phase ambiguity resolver which detects the words to not only reverse the received I(sub R) and Q(sub R) data channels, but to also invert (complement) the I(sub R) and/or Q(sub R) data, or to at least complement the I(sub R) and Q(sub R) data for systems using nontransparent codes that do not have rotation direction ambiguity
Characterisation of anisotropic etching in KOH using network etch rate function model: influence of an applied potential in terms of microscopic properties
Using the network etch rate function model, the anisotropic etch rate of p-type single crystal silicon was characterised in terms of microscopic properties including step velocity, step and terrace roughening. The anisotropic etch rate data needed have been obtained using a combination of 2 wagon wheel patterns on different substrate and 1 offset trench pattern. Using this procedure the influence of an applied potential has been investigated in terms of microscopic properties. Model parameter trends show a good correlation with chemical/electrochemical reaction mechanism and mono- and dihydride terminated steps reactivity difference. Results also indicate a minimum in (111) terrace roughening which results in a peak in anisotropic ratio at the non-OCP applied potential of −1250 mV vs OCP
The impact of NRZ data asymmetry on the performance of a space telemetry system
The telemetry data asymmetry due to rising and falling voltage transitions can cause undesired spectral components at the output of a spacecraft transmitter. The performance of a space telemetry system can potentially degrade because of these undesired components. Here, an expression is derived for the power spectral density of an asymmetric nonreturn-to-zero (NRZ) data stream. This formula is then used to investigate how the data bandwidth varies with data asymmetry. At the receiver end, the threshold levels of undesired spectral components that fall into the carrier-tracking-loop bandwidth are determined by examining the derived spectral density. Further, based on this formula, a simple technique is developed for the computation of bit signal-to-noise ratio (SNR) degradation due to data asymmetry. The telemetry bit SNR degradations derived using this technique are compared with results obtained previously and with measurements by the Electronic Systems Test Laboratory (ESTL) at the Lyndon B. Johnson Space Center
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Recent advances in our understanding of the structure and function of more unusual cation channels.
As their name implies, cation channels allow the regulated flow of cations such as sodium, potassium, calcium, and magnesium across cellular and intracellular membranes. Cation channels have long been known for their fundamental roles in controlling membrane potential and excitability in neurons and muscle. In this review, we provide an update on the recent advances in our understanding of the structure-function relationship and the physiological and pathophysiological role of cation channels. The most exciting developments in the last two years, in our opinion, have been the insights that cryoelectron microscopy has provided into the inner life and the gating of not only voltage-gated channels but also mechanosensitive and calcium- or sodium-activated channels. The mechanosensitive Piezo channels especially have delighted the field not only with a fascinating new type of structure but with important roles in blood pressure regulation and lung function
Coarse-Graining and Renormalization of Atomistic Binding Relations and Universal Macroscopic Cohesive Behavior
We present two approaches for coarse-graining interplanar potentials and
determining the corresponding macroscopic cohesive laws based on energy
relaxation and the renormalization group. We analyze the cohesive behavior of a
large---but finite---number of interatomic planes and find that the macroscopic
cohesive law adopts a universal asymptotic form. The universal form of the
macroscopic cohesive law is an attractive fixed point of a suitably-defined
renormalization-group transformation.Comment: 15 pages, 6 figures, submitted to the Journal of the Mechanics and
Physics of Solid
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