2,855 research outputs found
An Energy-conscious Transport Protocol for Multi-hop Wireless Networks
We present a transport protocol whose goal is to reduce power consumption without compromising delivery requirements of applications. To meet its goal of energy efficiency, our transport protocol (1) contains mechanisms to balance end-to-end vs. local retransmissions; (2) minimizes acknowledgment traffic using receiver regulated rate-based flow control combined with selected acknowledgements and in-network caching of packets; and (3) aggressively seeks to avoid any congestion-based packet loss. Within a recently developed ultra low-power multi-hop wireless network system, extensive simulations and experimental results demonstrate that our transport protocol meets its goal of preserving the energy efficiency of the underlying network.Defense Advanced Research Projects Agency (NBCHC050053
Composite MFV and Beyond
We revisit and extend realizations of Minimal Flavor Violation (MFV) in
theories with strongly coupled electro-weak symmetry breaking. MFV requires
that some chiralities of light SM quarks are strongly composite leading,
depending on the scenario, to bounds from compositeness searches, precision
electro-weak tests or even flavor physics. Within the framework of partial
compositeness we show how to extend the MFV paradigm allowing the treat the top
quark differently. This can be realized if for example the strong sector has an
U(2) symmetry. In this case the light generations can be mostly elementary and
all the bounds are easily satisfied.Comment: 16 pages. v2) estimates improved, conclusions unchange
Phenomenology of 10^32 Dark Sectors
We postulate an exact permutation symmetry acting on 10^32 Standard Model
copies as the largest possible symmetry extension of the Standard Model. This
setup automatically lowers the fundamental gravity cutoff down to TeV, and
thus, accounts for the quantum stability of the weak scale. We study the
phenomenology of this framework and show that below TeV energies the copies are
well hidden, obeying all the existing observational bounds. Nevertheless, we
identify a potential low energy window into the hidden world, the oscillation
of the neutron into its dark copies. At the same time, proton decay can be
suppressed by gauging the diagonal baryon number of the different copies. This
framework offers an alternative approach to several particle physics questions.
For example, we suggest a novel mechanism for generating naturally small
neutrino masses that are suppressed by the number of neutrino species. The
mirror copies of the Standard Model naturally house dark matter candidates. The
general experimentally observable prediction of this scenario is an emergence
of strong gravitational effects at the LHC. The low energy permutation symmetry
powerfully constrains the form of this new gravitational physics and allows to
make observational predictions, such as, production of micro black-holes with
very peculiar properties.Comment: 36 pages. v2, note added on oscillation of neutral state, Refs. adde
Footballs, Conical Singularities and the Liouville Equation
We generalize the football shaped extra dimensions scenario to an arbitrary
number of branes. The problem is related to the solution of the Liouville
equation with singularities and explicit solutions are presented for the case
of three branes. The tensions of the branes do not need to be tuned with each
other but only satisfy mild global constraints.Comment: 15 pages, Refs. added, minor changes. Typo in eq. 4.3 corrected.
Version to be published in PR
Otomatisasi Sistem Kontrol Ph Dan Informasi Suhu Pada Akuarium Menggunakan Arduino Uno Dan Raspberry Pi 3
Telah dirancang sebuah sistem otomatisasi kontrol kadar pH dan informasi suhu. Kadar pH di ukur dengan menggunakan sensor pH E-201-C dan suhu di ukur dengan sensor DS18B20. Proses kontrol pH di lakukan dengan menambahkan cairan pH up dan pH down dan direalisasikan dengan katup solenoid. Tujuan pembuatan sistem ini adalah untuk mengontrol nilai pH air dalam akuarium dan memberi informasi tentang suhu air. Ke dalam sistem ini telah diinput nilai standar pH dan suhu pada masing-masing jenis ikan. Sistem ini akan bekerja secara otomatis untuk menyesuaikan lingkungan hidup ikan hias sesuai dengan kebutuhannya masing-masing. Sistem pengontrolan pH dapat bekerja apabila nilai pengukuran pH menyatakan kondisi pH tinggi atau pH rendah dan pada kondisi tersebut air akan mengalir ke tabung penyesuaian pH untuk melakukan kontrol. Apabila nilai pengukuran pH menyatakan bahwa pH tinggi maka cairan Kontrol pH down akan mengalir dan apabila nilai pengukuran pH menyatakan bahwa pH rendah maka cairan kontrol pH up akan mengalir. Sistem ini telah teruji mampu mempertahankan kondisi lingkungan hidup ikan hias dengan hasil pengukuran pH dan suhu adalah 7.48 -7.8 dan 28.87 – 29.55 0C.
Kata kunci: Sensor pH E-201-C, Sensor DS18B20, pH down, pH up 
Molecular analysis has allowed the definitive diagnosis of multiple acyl-CoA dehydrogenase deficiency (MADD)
Multiple acyl-CoA dehydrogenation deficiency (MADD) is a rare autosomal recessive disorder due to defects in the electron transfer
flavoprotein (ETF) or in the electron transfer flavoprotein dehydrogenase (ETFDH) enzymes, involved in the mitochondrial electron
transport chain. Patients with MADD fall into different clinical phenotypes, ranging from a severe neonatal presentation, with metabolic
acidosis, cardiomyopathy and liver disease to a mild childhood/adult disease, with episodic metabolic decompensation, muscle weakness
and respiratory failure.Nowadays, the MADD diagnosis is established by the presence of dicarboxylic organic acids and acylglycine
derivatives in the urine and increased levels of medium-and long-chain acylcarnitines in the blood. Mutations in ETFA, ETFB, ETFDH
genes, encoding for alpha and beta subunits of ETF and for ETF-dehydrogenase are associated with MADD. We report the case of a three
years old child, affected by lethargy and asthenia associated with anorexia. Biochemical analyses showed hypoketotic hypoglycemia with
remarkable increments in transaminases, lactic dehydrogenase, aldolase and creatine kinase. The chromatographic layout of urinary
organic acids showed a typical dicarboxylic aciduria. Thus, based on these features, MADD was suspected. Fifteen years later, at the
age of 19, MADD diagnosis was confirmed by molecular analysis, showing a compound heterozygosity for the mutations c.1074G>C
(p.R358S; HGMD: CM031670 in HGMD database) and c.1073G>A (p.R358K) in the ETFDH gene. The c.1073G>A (p.R358K;
rs796051959) mutation is reported in ClinVar database as pathogenic allele, although lacking link to a specific clinical condition. However,
familial segregation study and in silico analysis, performed by bioinformatics tools, confirmed that this substitution is likely pathogenetic.
Her parents were healthy carriers of one of the two mutations. It is known that the severity of the clinical phenotype of MADD may
be related to the type of mutation in the ETFA/ETFB/ETFDH genes. Particularly, missense mutations in the ETFDH gene, leaving a
detectable residual enzyme activity, may account for the milder form of the disease, as is the case here. In conclusion we suggest that
molecular analysis is essential to the definitive diagnosis of MADD and to direct the adequate therapeutic management. Thus, through
a close nutritional follow up, a few months ago the patient gave birth to a healthy boy.
References
Olsen et al. Clear relationship between ETF/ETFDH genotype and phenotype in patients with multiple acyl-CoA dehydrogenation
deficiency. Hum Mutat. 2003; 22:12–23
Spin and a Running Radius in RS1
We develop a renormalization group formalism for the compactified
Randall-Sundrum scenario wherein the extra-dimensional radius serves as the
scaling parameter. Couplings on the hidden brane scale as we move within local
effective field theories with varying size of the warped extra dimension. We
consider this RG approach applied to U(1) gauge theories and gravity. We use
this method to derive a low energy effective theory.Comment: 18 pages, minor changes, references adde
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