Destruction of chain-superconductivity in YBa_2Cu_4O_8 in a weak magnetic field

We report measurements of the temperature dependent components of the magnetic penetration depth {\lambda}(T) in single crystal samples of YBa_2Cu_4O_8 using a radio frequency tunnel diode oscillator technique. We observe a downturn in {\lambda}(T) at low temperatures for currents flowing along the b and c axes but not along the a axis. The downturn in {\lambda}_b is suppressed by a small dc field of ~0.25 T. This and the zero field anisotropy of {\lambda}(T) likely result from proximity induced superconducting on the CuO chains, however we also discuss the possibility that a significant part of the anisotropy might originate from the CuO2 planes.Comment: 5 page

Analisis Implementasi Pendidikan Berbasis Budaya Pada Lembaga Pendidikan Nonformal Di Daerah Istimewa YOGYAKARTA

Penelitian ini bertujuan untuk mendeskripsikan pentingnya analisis terhadapimplementasi pendidikan berbasis budaya (Perda no 5 Tahun 2011) di Daerah IstimewaYogyakarta khususnya pada Lembaga Kursus dan Pelatihan (LKP) sebagai layananpendidikan masyarakat. Penelitian ini menggunakan pendekatan kualitatif. Hasilpenelitian menunjukkan bahwa 1) sosialisasi pendidikan berbasis budaya dilakukansecara terstruktur dari tingkat propinsi hingga lembaga penyelenggara kursus melaluiworkshop, TOT, seminar, FGD; 2) Tingkat kesiapan LKP dalam menjalankan pendidikanberbasis budaya dari aspek isi, proses, sarana prasarana dan sumber daya manusia terlibatdalam layanan pendidikan masyarakat ini berbeda-beda. Terdapat 46 LKP di DIY dengankualifikasi terakreditasi BANPNF ada sebagian yang belum sepenuhnya menerapkanpendidikan berbasis budaya; 3) Beberapa kesulitan yang teridentifikasi kaitannya denganimplementasi Perda no 5 Tahun 2011 tentang pendidikan berbasis budaya ini meliputikompleksitas permasalahan yang dihadapi LKP, kesulitan dalam mencari indikatorpendidikan berbasis budaya berdasarkan nilai-nilai luhur budaya Yogyakarta sehinggatidak mudah untuk diintegrasikan ke dalam materi pembelajaran, waktu yang digunakanuntuk menyusun kurikulum berbasis budaya ke dalam format-format yang baru sangatpanjang dengan tim yang sering berganti-ganti sehingga terkesan melelahka

3D printable electroconductive gelatin‑hyaluronic acid materials containing polypyrrole nanoparticles for electroactive tissue engineering

Electrically conductive bio-scaffolds are explored in the field of tissue engineering (TE) as a solution to address the clinical need of electroactive tissues, finding applications in nervous, cardiac, and spinal cord injury repair. In this work, we synthesise polypyrrole nanoparticles (PPy NP) via the mini-emulsion method with further combination with a gelatin/hyaluronic acid (HA) hydrogel to create electroconductive Gel:HA:PPy-NP TE scaffolds. Electroconductive Gel:HA:PPy-NP scaffolds possess excellent mechanical properties at 1.08 ± 0.26 MPa, closely matching the reported mechanical performance of the spinal cord. Scaffolds were designed with controlled porosity of 526.2 ± 74.6â 403.9 ± 57.4 μm, and conductivities of 4.3 à 10 â 6 ± 1.1 à 10 â 6 S.cm â 1 were reached. Rheological studies show that prior to lyophilisation, the Gel:HA:PPy-NP hydrogels display a shear-thinning behaviour. These gels were subsequently 3D printed into predefined 2 layer lattice geometries and displayed excellent post-printing shape fidelity. In vitro studies show that the Gel:HA:PPy-NP scaffolds are cytocompatible with mesenchymal stem cells and neuronal stem cells and display encouraging cell attachment and proliferation profiles. Based on these results, the incorporation of PPy NPs into Gel:HA biomaterial scaffolds enhances the conductive capabilities of the material, while showcasing biocompatible behaviour with cell cultures. Hence, Gel:HA:PPy-NP scaffolds are a promising TE option for stimulating regeneration following nervous tissue injury.The authors would like to thank the funding provided by the Irish Research Council through the Irish Research Council Enterprise Partnership Scheme with Johnson and Johnson (EPSPG/2020/78), as well as the Irish Fulbright Commission

No strings attached: Force and vibrotactile feedback in a virtual guitar simulation

The poster describes a multisensory simulation of plucking guitar strings in virtual reality and a user study evaluating the simulation. Auditory feedback is generated by a physics-based simulation of guitar strings, and haptic feedback is provided by a combination of high fidelity vibrotactile actuators and a Phantom Omni. The study compared four conditions: no haptic feedback, vibrotactile feedback, force feedback, and a combination of force and vibrotactile feedback. The results indicate that the combination of vibrotactile and force feedback elicits the most realistic experience, and during this condition, participants were less likely to inadvertently hit strings. Notably, no significant differences were found between the conditions involving either vibrotactile or force feedback

Line nodes in the energy gap of high-temperature superconducting BaFe_2(As_{1-x}P_x)_2 from penetration depth and thermal conductivity measurements

We report magnetic penetration depth and thermal conductivity data for high-quality single crystals of BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$ ($T_c=30$\,K) which provide strong evidence that this material has line nodes in its energy gap. This is distinctly different from the nodeless gap found for (Ba,K)Fe$_2$As$_2$ which has similar $T_c$ and phase diagram. Our results indicate that repulsive electronic interactions play an essential role for Fe-based high-$T_c$ superconductivity but that uniquely there are distinctly different pairing states, with and without nodes, which have comparable $T_c$.Comment: 4 pages, 3 figures, revised version to be published in Phys. Rev. B Rapid Communicatio

Heliophysics Event Knowledgebase for the Solar Dynamics Observatory and Beyond

The immense volume of data generated by the suite of instruments on SDO requires new tools for efficient identifying and accessing data that is most relevant to research investigations. We have developed the Heliophysics Events Knowledgebase (HEK) to fill this need. The HEK system combines automated data mining using feature-detection methods and high-performance visualization systems for data markup. In addition, web services and clients are provided for searching the resulting metadata, reviewing results, and efficiently accessing the data. We review these components and present examples of their use with SDO data.Comment: 17 pages, 4 figure

Plate Wastage and the Service Quality of the Cafeteria in a Private High School

Millions of people in the world are suffering from scarcity of food, yet tons of food are wastedevery day. This study was conducted to determine the food wastage of high school studentsand the service quality of a cafeteria located in Silang, Cavite. Convenience sampling wasutilized to select high school students enrolled in the school where the cafeteria is situated toparticipate in the study. A descriptive-evaluative research design was used and data gatheredwere analyzed using descriptive statistics such as frequency, mean, and standard deviation.Quarter waste method was used to measure plate wastage while adopted questionnaire wasused to determine the service quality of the cafeteria. Findings revealed that the highestpercentage of food wastage was gluten followed by ground vegescallop, vegemeat, tofu, andbeans. In terms of service quality, the lowest percentage was the dining area (Mean= 2.95 andSD= 0.80), followed by Food Quality (Mean=3.44 and SD= 0.80), Food Variety (Mean= 3.76and SD= 0.61), Personnel employees’ service (Mean= 3.80 and SD= 0.79), and Serving time(Mean= 3.85 and SD= 0.80). Among the five protein foods that incurred a leftover, gluten hasthe highest percentage of waste while among the five factors contributing to the service qualityof a cafeteria, dining area has the lowest percentage. Based on the results, the use of gluten aspart of the meal and the dining area as a place to eat should be improved to lessen the foodwastage and enhance the service quality, respectively

Nuclear Recoil Scintillation Linearity of a High Pressure 4^4He Gas Detector

We investigate scintillation linearity of a commercial high pressure $^4$He gas detector using monoenergetic 2.8 MeV neutrons from a deuterium-deuterium fusion neutron generator. The scintillation response of the detector was measured for a range of recoil energies between 83 keV and 626 keV by tagging neutrons scattering into fixed angles with a far-side organic scintillator detector. Detailed Monte Carlo simulations were compared to experimental data to determine the linearity of the detector response by comparing the scaling of the energy deposits in the simulations to the detector output. In this analysis, a linear scintillation response corresponds to a consistent value for the scaling factor between simulated energy deposits and experimental data for several different scattering angles. We demonstrate that the detector can be used to detect fast neutron interactions down to 83 keV recoil energies and can be used to characterize low-energy neutron sources, one of its potential applications

Noncovalent interactions in crowded olefinic radical cations

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