Homogenising the design criteria of a community battery energy storage for better grid integration

Historically, minimum system demand has usually occurred overnight. However, in recent years, the increased penetration of rooftop photovoltaic systems (RPVs) has caused an even lower demand at midday, forcing some of the conventional generators to shut down only hours before the evening peak demand period. This further complicates the job of power system operators, who need to run the conventional generator at the minimum stable level at the midday low-demand period so that they can reliably supply power during the peak periods. Employing a community battery storage system can alleviate some of the technical issues caused by the high penetration of RPVs. This paper proposed a design criterion for community battery energy storage systems and employed the battery for the improvement of the duck curve profile and providing the desired level of peak-shaving. Furthermore, remote communities with high penetration of RPVs with a community battery energy storage can achieve the desired level of self-sufficiency. To this end, this study recommends and confirms an applicable design criterion for community battery energy storage. The study shows that the suitable size of community battery storage should be based on the community’s daily excess generation and consumption requirements. The results of various scenarios performed on the proposed design criterion show the extent to which the desired objectives of peak-shaving, duck curve mitigation, and self-sufficiency can be achieved

Model Education Reconstruction (Mer) Bahan Ajar Penelitian Laboratorium (Pl) Konteks Zeolit Berbasis Problem Solving-decision Making (Psdm)

. Aspects discussed in this research is to improve the intelligence thinking of student research through a MER (Duit 2012). Based on a problem that is often found that the appearance of lack of originality of research because students are not able to think of research, which is shown in a preliminary study.Based on these problems, researchers developed teaching materials to reconstruct RL context zeolite based PSDM. The instrument was a questionnaire response experts to determine the feasibility of the cognitive level of the student materials in accordance with the character of the curriculum in 2013. The characteristics of instructional materials: 1) was developed in accordanceaspect PSDM attitude Myers-Briggs Type Indicator (MBTI), 2) the context ofthe lecture corresponding zeolite mineral chemistry issues, 3) content according to the level of cognitive student accesible criteria, 4) Perspective students to the concept of material through interviews. Interviews showed> 80% of the students have any preconceptions about the meaning of the scientific method and thinking research. Therefore, the insertion of material thought PSDM based research on teaching materials need to be raised. Validation / CVR obtain the Value 0.76, and CVI c(0,76) > CVI t(0,68) showed very appropriate instructional materials used

New exact solutions of stokes' second problem for an MHD second grade fluid in a porous space

We investigate a problem describing the oscillating flow of an incompressible magnetohydrodynamic (MHD) second grade fluid in a porous half space. Exact solutions for sine and cosine oscillations are developed by applying the Laplace transform method. The total obtained solution is a sum of steady and transient solutions. Particular attention is given to the effects of magnetic and porous medium parameters on the velocity. It is shown that previous results for a non-porous medium and hydrodynamic fluid are the limiting cases of the present problem. The results for velocity are plotted and discussed carefully

Violation of Heisenberg's Measurement-Disturbance Relationship by Weak Measurements

While there is a rigorously proven relationship about uncertainties intrinsic to any quantum system, often referred to as "Heisenberg's Uncertainty Principle," Heisenberg originally formulated his ideas in terms of a relationship between the precision of a measurement and the disturbance it must create. Although this latter relationship is not rigorously proven, it is commonly believed (and taught) as an aspect of the broader uncertainty principle. Here, we experimentally observe a violation of Heisenberg's "measurement-disturbance relationship", using weak measurements to characterize a quantum system before and after it interacts with a measurement apparatus. Our experiment implements a 2010 proposal of Lund and Wiseman to confirm a revised measurement-disturbance relationship derived by Ozawa in 2003. Its results have broad implications for the foundations of quantum mechanics and for practical issues in quantum mechanics.Comment: 5 pages, 4 figure

HUBUNGAN PENGETAHUAN DAN SIKAP PETANI DENGAN PEMAKAIAN ALAT PELINDUNG DIRI (APD) SAAT PENYEMPROTAN PESTISIDA

Penggunaan pestisida merupakan masalah yang tidak dapat dipisahkan dari kehidupan manusia. Indonesia merupakan negara yang masyarakatnya kurang memperhatikan penggunaan alat pelindung diri saat melakukan penyemprotan pestisida. Pada umumnya petani kesulitan menggunakan alat pelindung diri saat menggunakan pestisida. Hal ini disebabkan kurangnya pengetahuan petani tentang alat pelindung diri. Pestisida merupakan zat yang bersifat racun. Karena toksisitasnya, penggunaan pestisida selalu menimbulkan risiko bagi pengguna dan lingkungan. Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara pengetahuan dan perilaku petani saat menggunakan alat pelindung diri (APD) saat melakukan penyemprotan pestisida di desa Tonasa kecamatan Tombolo Pao Kabupaten Gowa. Jenis penelitian ini adalah penelitian kuantitatif yang menggunakan studi cross sectional. Populasi penelitian ini adalah petani pengguna pestisida di Desa Tonasa. Dalam penelitian ini, jumlah petani sebanyak 40 orang. Pengambilan sampel menggunakan teknik aksidental sampling dengan angket. Berdasarkan survei tersebut, 27 orang (67,5%) berpengetahuan kurang, 7 orang (17,5%) berpengetahuan cukup dan 6 orang yang pengetahuannya baik. Demikian pula, hanya 11 (27,5%) responden yang memiliki sikap positif terhadap APD. Oleh karena itu, dapat disimpulkan bahwa ada hubungan antara pengetahuan dan perilaku petani mengenai penggunaan alat pelindung diri (APD) saat melakukan penyemprotan pestisida di desa Tonasa. Rekomendasi bagi peneliti lain untuk lebih memahami faktor-faktor lain yang terkait dengan ketidakpatuhan penggunaan alat pelindung diri

Andreev Reflection without Fermi surface alignment in High Tc_{c}-Topological heterostructures

We address the controversy over the proximity effect between topological materials and high T$_{c}$ superconductors. Junctions are produced between Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ and materials with different Fermi surfaces (Bi$_{2}$Te$_{3}$ \& graphite). Both cases reveal tunneling spectra consistent with Andreev reflection. This is confirmed by magnetic field that shifts features via the Doppler effect. This is modeled with a single parameter that accounts for tunneling into a screening supercurrent. Thus the tunneling involves Cooper pairs crossing the heterostructure, showing the Fermi surface mis-match does not hinder the ability to form transparent interfaces, which is accounted for by the extended Brillouin zone and different lattice symmetries

Noninvasive electron microscopy with interaction-free quantum measurements

We propose the use of interaction-free quantum measurements with electrons to eliminate sample damage in electron microscopy. This might allow noninvasive molecular-resolution imaging. We show the possibility of such measurements in the presence of experimentally measured quantum decoherence rates and using a scheme based on existing charged particle trapping techniques.David and Lucile Packard Foundatio

Evidence for a New Excitation at the Interface Between a High-Tc Superconductor and a Topological Insulator

High-temperature superconductors exhibit a wide variety of novel excitations. If contacted with a topological insulator, the lifting of spin rotation symmetry in the surface states can lead to the emergence of unconventional superconductivity and novel particles. In pursuit of this possibility, we fabricated high critical-temperature (Tc ~ 85 K) superconductor/topological insulator (Bi2Sr2CaCu2O8+delta/Bi2Te2Se) junctions. Below 75 K, a zero-bias conductance peak (ZBCP) emerges in the differential conductance spectra of this junction. The magnitude of the ZBCP is suppressed at the same rate for magnetic fields applied parallel or perpendicular to the junction. Furthermore, it can still be observed and does not split up to at least 8.5 T. The temperature and magnetic field dependence of the excitation we observe appears to fall outside the known paradigms for a ZBCP