102,151 research outputs found
ICECUBE NEUTRINOS AND LORENTZ INVARIANCE VIOLATION
No full textThe IceCube neutrino telescope has found so far no evidence of gamma-ray burst (GRB) neutrinos. We here notice that these results assume the same travel times from source to telescope for neutrinos and photons, an assumption that is challenged by some much-studied pictures of spacetime quantization. We briefly review previous results suggesting that limits on quantum-spacetime effects obtained for photons might not be applicable to neutrinos, and we then observe that the outcome of GRB-neutrino searches could depend strongly on whether one allows for neutrinos to be affected by the minute effects of Lorentz invariance violation (LIV) predicted by some relevant quantum-spacetime models. We discuss some relevant issues using as an illustrative example three neutrinos that were detected by IceCube in good spatial coincidence with GRBs, but hours before the corresponding gamma rays. In general, this could happen if the earlier arrival reflects quantum-spacetime-induced LIV, but, as we stress, some consistency criteria must be enforced in order to properly test such a hypothesis. Our analysis sets the stage for future GRB-neutrino searches that could systematically test the possibility of quantum-spacetime-induced LIV
Cosmic rays and TeV photons as probes of quantum properties of space-time
No full textIt has been recently observed that small violations of Lorentz invariance, of a type which may arise in quantum gravity, could explain both the observations of cosmic rays above the GZK cutoff and the observations of 20-TeV gamma rays from Markarian 501. We show here that different pictures of the short-distance structure of space-time would lead to different manifestations of Lorentz-invariance violation. Specifically, the deformation of Lorentz invariance needed to resolve these observational paradoxes can only arise within commutative short-distance pictures of space-time. In noncommutative space-times there is no anomalous effect, at least at leading order. Also exploiting the fact that arrival-time delays between high energy photons with different energies would arise in both the commutative and the noncommutative Lorentz-violation pictures, we describe an experimental programme, based on time-of-arrival analysis of high energy photons and searches of violations of GZK and TeV-photon limits, which could discriminate between alternative scenarios of Lorentz-invariance breakdown and could provide and unexpected window on the (quantum) nature of space-time at very short distances
Planck-scale deformation of Lorentz symmetry as a solution to the UHECR and the TeV- paradoxes
No full textOne of the most puzzling current experimental physics paradoxes is the arrival on Earth of Ultra High Energy Cosmic Rays with energies above the GZK threshold. The recent observation of 20TeV photons from Mk 501 is another somewhat similar paradox. Several models have been proposed for the UHECR paradox. No solution has yet been proposed for the TeV- paradox. Remarkably, the drastic assumption of a violation of ordinary Lorentz invariance would resolve both paradoxes. We present a formalism for the description of the type of Lorentz-invariance deformation (LID) that could be induced by non-trivial short-distance structure of space-time, and we show that this formalism is well suited for comparison of experimental data with LID predictions. We use the UHECR and TeV- data, as well as bounds on time-of-flight differences between photons of different energies, to constrain the LID parameter space. A model with only two parameters, an energy scale and a dimensionless parameter characterizing the functional dependence on the energy scale, is shown to be sufficient to solve both the UHECR and the TeV- threshold anomalies while satisfying the time-of-flight bounds. The allowed region of the two-parameter space is relatively small, but, remarkably, it fits perfectly the expectations of the quantum-gravity-motivated space-time models known to support such deformations of Lorentz invariance: integer value of the dimensionless parameter and characteristic energy scale constrained to a narrow interval in the neighborhood of the Planck scale
Magnetic field decay in neutron stars : from soft gamma repeaters to weak-field magnetars'
No full textThe recent discovery of the weak-field, old magnetar soft gamma repeater (SGR) J0418+5729, whose dipole magnetic field, Bdip, is less than 7.5 x 10(12) G, has raised perplexing questions: how can the neutron star produce SGR-like bursts with such a low magnetic field? What powers the observed X-ray emission when neither the rotational energy nor the magnetic dipole energy is sufficient? These observations, which suggest either a much larger energy reservoir or a much younger true age (or both), have renewed the interest in the evolutionary sequence of magnetars. We examine here a phenomenological model for the magnetic field decay: and compare its predictions with the observed period, P, the period derivative, , and the X-ray luminosity, LX, of magnetar candidates. We find a strong evidence for a dipole field decay on a time-scale of similar to 10(3) yr for the strongest (Bdip similar to 10(15) G) field objects, with a decay index within the range 1 =a < 2 and more likely within 1.5 less than or similar to alpha a less than or similar to 1.8. The decaying field implies a younger age than what is implied by . Surprisingly, even with the younger age, the energy released in the dipole field decay is insufficient to power the X-ray emission, suggesting the existence of a stronger internal field, Bint. Examining several models for the internal magnetic field decay, we find that it must have a very large (greater than or similar to 10(16) G) initial value. Our findings suggest two clear distinct evolutionary tracks the SGR/anomalous X-ray pulsar branch and the transient branch, with a possible third branch involving high-field radio pulsars that age into low-luminosity X-ray dim isolated neutron stars
Pulse oximetry oxygen saturation during the 6-min walk test : a limit for stopping the test without resuming it
No full textEvaluation and agronomic potential of androgenic pepper genotypes derived from Piran (Capsicum annuum L. cv. Piran)
No full textAims: This study was to evaluate and estimate the agronomic potential of two androgenic genotypes via important plant, fruit and production traits compared to the mother genotype Piran.
Place and Duration of Study: Strumica, Faculty of Agriculture, Goce Delcev University-Stip,Republic of Macedonia, four-years experiment.
Methodology: The experiment was set up in random block design in four replications. Evaluation of the androgenic genotypes was performed according to morphological traits given in Descriptor for Capsicum spp. The analysis of plant traits was conducted on 20 randomly chosen plants (5 plants per replication) in maximum growth stage from each androgenic genotype and the control Piran. The analysis of fruit traits was conducted on 40 randomly chosen fruits (10 fruits per replication) in ripe stage from each androgenic genotype and the control.
Results: Androgenic genotype P3 was characterized as tall pepper type with medium-thick stem and large leaves. According to the fruit weight (41.45 g) and the fruit index higher than 4, the genotype is classified as long, horn-shaped, middle-size fruit pepper. The fruit flesh of 77.05% and the pericarp thickness 0.26 cm characterized this fruit as medium-fleshy. Androgenic genotype P4
was characterized as very tall pepper type with medium-thick stem and medium-large leaves. The fruit weight was 42.84 g, contained averagely 7.37% dry matter, 76.71% fruit flesh and 0.25 cm pericarp thickness. P4 fruit was long, horn-shaped, medium-size and medium-fleshy. Fruits of both genotypes were suitable for fresh and preserved consumption.
Conclusion: Analysis of morphological and productivity traits of androgenic genotypes provides valuable information for future breeding. Androgenic genotype P3 differ from the initial genotype for four traits, while the P4 genotype for six traits. The results of this research prove the advantage of pepper androgenesis as a tool for enrichment of biodiversity and fast development of valuable pepper genotypes for future breeding
Efficacy of an acupressure mat in association with therapeutic exercise in the management of chronic low back pain: A prospective randomized controlled study
No full text(1) Background: Acupressure is a noninvasive, low-cost technique that makes use of physical pressure on specific points using a finger or a device and shows positive effects on chronic pain as an adjunctive method to the rehabilitation exercises. The study’s aim was to evaluate the therapeutic efficacy on pain, disability, and life quality of an acupressure mat associated with a rehabilitation program in patients with chronic low back pain. (2) Methods: All participants underwent a specific rehabilitation program, initially with 10 supervised exercise sessions, then as home exercise for 6 months. The subjects in the experimental group (EG) were additionally provided with an acupressure mat and used it for 60 min per day. (3) Results: 44 patients (31 females) were equally divided among the treatment groups. A significant time interaction was found in both groups for McGill Pain Questionnaire, Oswestry Disability Index, and EuroQol-5D, and only in the EG for Visual Analog Scale. (4) Conclusions: The acupressure mat is simple and provides an additional benefit for patients in relieving pain and improving function and quality of life, especially in the medium-to-long term
The Casimiro experiment: dynamical detection of Casimir forces
No full textT. Piran editor, World Scientific, Singapor
PENGARUH SUBSTITUSI TEPUNG BAYAM MERAH TERHADAP DAYA TERIMA NUGGET HATI AYAM
No full textPengaruh Substitusi Tepung Bayam Merah Terhadap Daya Terima Nugget Hati Ayam
Antonia Eda Piran Email : [email protected]
Poltekkes Kemenkes Kupang Prodi Gizi
Latar Belakang : Penurunan kadar hemoglobin dalam tubuh dikenal sebagai anemia. Hemoglobin adalah metalloprotein, atau protein yang membawa zat besi dalam sel darah merah dan berfungsi sebagai sarana untuk membawa oksigen dari paru-paru ke seluruh tubuh. WHO (2015), Organisasi Kesehatan Dunia Anemia mempengaruhi 1,32 miliar orang di seluruh dunia, atau lebih dari 25% dari populasi, menurut perkiraan. Menurut Riskesdas (2019), 72,2% remaja Nusa Tenggara Timur (NTT) mengalami anemia pada tahun 2021. Menjadikan makanan lokal sebagai alternatif sangat penting untuk memerangi anemia.
Tujuan : Penelitian ini Untuk mengetahui pengaruh substitusi tepung bayam merah terhadap daya terima dan nilai gizi nugget hati ayam. Metode penelitian : Eksperimen menggunakan Rancangan Acak Lengkap (RAL) dengan 4 taraf perlakuan yaitu P0,P1,P2,P3. Analisis statistik Oneway Anova digunakan untuk menganalisis data pada interval tingkat kepercayaan 95%. Uji tukay dilakukan untuk melanjutkan apabila terjadi perbedaan. Hasil : Substitusi tepung bayam merah meningkatkan nilai gizi makronutrien (energi, protein, lemak, karbohidrat dan fe) nugget hati ayam. Selain gizi makro penilaiam organoleptik 4 kategori.
Kesimpulkan : Dari hasil penelitian ini, peneliti merekomendasi P1karena berdasarkan hasil uji Anova P1 >0,05 dengan arti setiap aspek yang diuji tidak signifikan atau tidak memiliki perbedaan yang nyata. Selain itu dari segi nilai gizi P1 memiliki kandungan nilai gizi yang paling tigggi dengan nilai Fe 1,43 mg, Energi 61,1 kkal, Protein 4,94 g, Lemak 1,64 g dan Karbohidrat 6,27g.
Kata kunci : Anemia, tepung bayam merah, nugget hati ayam, subtitus
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
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