9,953 research outputs found
Quantum computing on long-lived donor states of Li in Si
We predict a gigantically long lifetime of the first excited state of an
interstitial lithium donor in silicon. The nature of this effect roots in the
anomalous level structure of the {\em 1s} Li manifold under external stress.
Namely, the coupling between the lowest two states of the opposite parity is
very weak and occurs via intervalley phonon transitions only. We propose to use
these states under the controlled ac and dc stress to process quantum
information. We find an unusual form of the elastic-dipole interaction between
%the electronic transitions in different donors. This interaction scales with
the inter-donor distance as or for the transitions
between the states of the same or opposite parity, respectively. The long-range
interaction provides a high fidelity mechanism for 2-qubit operations
Electron Impact Excitation Cross Sections for Hydrogen-Like Ions
We present cross sections for electron-impact-induced transitions n --> n' in
hydrogen-like ions C 5+, Ne 9+, Al 12+, and Ar 17+. The cross sections are
computed by Coulomb-Born with exchange and normalization (CBE) method for all
transitions with n < n' < 7 and by convergent close-coupling (CCC) method for
transitions with n 2s and 1s
--> 2p are presented as well. The CCC and CBE cross sections agree to better
than 10% with each other and with earlier close-coupling results (available for
transition 1 --> 2 only). Analytical expression for n --> n' cross sections and
semiempirical formulae are discussed.Comment: RevTeX, 5 pages, 13 PostScript figures, submitted to Phys. Rev.
A successful outcome of pregnancy with Berger disease
With the increasing prevalence of chronic kidney disease (CKD) in the general population, female patients of fertile age with impaired kidney function are becoming more common. The presence of CKD in pregnant patients has been associated with poorer pregnancy outcomes. IgA nephropathy is the most common glomerulonephritis worldwide. The outcome of pregnancy in patients with CKD is related to impaired glomerular filtration rate and the degree of proteinuria. In non-aggressive IgA nephropathy, there is traditionally a slow progression to chronic kidney failure in 25â30% of cases during a period of 20 years. Women with immunoglobulin g A nephropathy (IgAN) are at higher risk of hypertension, preeclampsia, and fetal loss; the prognosis is worse for those who have advanced chronic kidney disease and proteinuria. Here we present two case reports who successfully delivered having aggressive IgA nephropathy and chronic hypertension in pregnancy.
A retrospective study on ectopic pregnancy aspiration by transvaginal ultrasound at Institute of Kidney Diseases And Research Centre
Background: Majority of the reports suggest that the frequency of ectopic pregnancies have grown in the last 30 years, especially in patients conceived through artificial reproductive techniques (ART). To prevent severe morbidity and mortality its prompt diagnosis and appropriate management is important. In a select patient population, most of the unruptured, live ectopic pregnancies can be successfully managed without surgical intervention using trans-vaginal ultrasound guided aspiration and instillation of local injection KCl or administration of systemic Inj. Methotrexate.
Methods: This study is a hospital based retrospective cohort study from January 2014 to December 2022 on patients who presented to Institute of Kidney Diseases and Research Centre (IKDRC) with unruptured ectopic pregnancy confirmed with ultrasound and ÎČ HCG. All the patients were analyzed according to history, clinical presentation, investigations, treatment and complications.
Results: ÎČ-HCG day 1 or 2 post procedure dropped in all cases but in variable levels ranging from 1.3% to 85.88%, while the drop during days 7-10, was more significant and reassuring; ranged from 48.69% to 98.95%.
Conclusions: By aspiration of ectopic gestational sac transvaginally under ultrasonographic guidance it is able to preserve the integrity of uterus and fallopian tube and thus the future fertility. The study will educate other healthcare professionals.
Scaling of hadronic transverse momenta in a hydrodynamic treatment of relativistic heavy ion collisions
The transverse momenta of hadrons in central nucleus-nucleus collisions are
evaluated in a boost invariant hydrodynamics with transverse expansion. Quark
gluon plasma is assumed to be formed in the initial state which expands and
cools via a first order phase transition to a rich hadronic matter and
ultimately undergoes a freeze-out. The average transverse momentum of pions,
kaons, and protons is estimated for a wide range of multiplicity densities and
transverse sizes of the system. For a given system it is found to scale with
the square-root of the particle rapidity density per unit transverse area, and
consistent with the corresponding values seen in experiments at
1800 GeV, suggesting a universal behaviour. The average transverse momentum
shows only an approximate scaling with multiplicity density per nucleon which
is at variance with the data.Comment: 6 pages including 9 figure
A successful pregnancy outcome after mitral valve replacement: a case report
Valvular heart disease can be acquired or congenital. Although the incidence of rheumatic heart disease is on the decline, the number of patients with congenital heart disease who survive into adulthood has grown substantially over the past 30 years. Therefore, a large number of patients with valvular heart disease will be of childbearing age. Here we presented a case of second gravida who was diagnosed with rheumatic heart disease and had undergone mitral valve prosthesis and tricuspid valve repair delivered a healthy live male baby weighing 2.250 kg
Comparative Evaluation of Action Recognition Methods via Riemannian Manifolds, Fisher Vectors and GMMs: Ideal and Challenging Conditions
We present a comparative evaluation of various techniques for action
recognition while keeping as many variables as possible controlled. We employ
two categories of Riemannian manifolds: symmetric positive definite matrices
and linear subspaces. For both categories we use their corresponding nearest
neighbour classifiers, kernels, and recent kernelised sparse representations.
We compare against traditional action recognition techniques based on Gaussian
mixture models and Fisher vectors (FVs). We evaluate these action recognition
techniques under ideal conditions, as well as their sensitivity in more
challenging conditions (variations in scale and translation). Despite recent
advancements for handling manifolds, manifold based techniques obtain the
lowest performance and their kernel representations are more unstable in the
presence of challenging conditions. The FV approach obtains the highest
accuracy under ideal conditions. Moreover, FV best deals with moderate scale
and translation changes
Leaving the nest: the rise of regional financial arrangements and the future of global governance
This article examines the impact of regional financial arrangements (RFAs) on the global liquidity regime. It argues that the design of RFAs could potentially alter the global regime, whether by strengthening it and making it more coherent or by decentring the International Monetary Fund (IMF) and destabilizing it. To determine possible outcomes, this analysis deploys a âmiddleâupâ approach that focuses on the institutional design of these RFAs. It first draws on the rational design of institutions framework to identify the internal characteristics of RFAs that are most relevant to their capabilities and capacities. It then applies these insights to the interactions of RFAs with the IMF, building on Aggarwal's (1998) concept of ânestedâ versus âparallelâ institutions, to create an analytical lens through which to assess the nature and sustainability of nested linkages. Through an analysis of the Chiang Mai Initiative Multilateralization (CMIM) and the Latin American Reserve Fund (FLAR), the article demonstrates the usefulness of this lens. It concludes by considering three circumstances in which fault lines created by these RFAsâ institutional design could be activated, permitting an institution to âleave the nestâ, including changing intentions of principals, creation of parallel capabilities and facilities, and failure of the global regime to address regional needs in a crisis.The authors would like to thank Veronica Artola, Masatsugu Asakawa, Ana Maria Carrasquilla, Junhong Chang, Paolo Hernando, Hoe Ee Khor, Kazunori Koike, Jae Young Lee, Ser-Jin Lee, Guillermo Perry, Yoichi Nemoto, Freddy Trujillo, Masaaki Watanabe, Yasuto Watanabe, Akihiko Yoshida, and others who wished to remain anonymous, for their generosity in providing in-person interviews. Further, the authors would like to thank various central bank and ministry of finance officials of both FLAR and CMIM member countries. We also thank Jose Antonio Ocampo, Diana Barrowclough, and participants in the 'Beyond Bretton Woods' Workshop at Boston University (where an earlier version of this article was presented in September 2017) for their feedback on our broader research projects on RFAs. Last but not least, the authors wish to thank the anonymous referees for their constructive comments. This work builds upon previous work funded by UNCTAD and the Global Economic Governance Initiative at the Global Development Policy Center at Boston University. (UNCTAD; Global Economic Governance Initiative at the Global Development Policy Center at Boston University)Accepted manuscrip
Agricultural innovation and adaptation to climate change: empirical evidence from diverse agro-ecologies in South Asia
While impacts of climate change on agricultural systems have been widely researched, there is still limited understanding of what agricultural practices evolves over time in response to both climatic and non-climatic drivers and how actors mobilize their resources, institutions and practices in South Asia. Through eight case studies and a survey of300 households in 15 locations in India, Nepal and Bangladesh, this paper generates empirical evidence on emerging agricultural interventions in contrasting socio-economic, geographical and agro-ecological contexts. The study shows that several farm practices emerge out in response to multiple drivers over time; some of them can be further adjusted to the challenge of climate change by planned adaptation programs. Most actors, however, have considered private risks in the short run. Although there has been some progress in streamlining climate change into strategic planning in different countries of South Asia, policy, research and extension systems lack adequate attention to wider resilience of the system. Based on this analysis, we recommend that adaptation policies should complement farmersâ responses to climate change through informed research and extension systems and pro-poor government policies that improve adaptation and coordinate activities of different actors
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