Geometry induced entanglement transitions in nanostructures

We model quantum dot nanostructures using a one-dimensional system of two interacting electrons. We show that strong and rapid variations may be induced in the spatial entanglement by varying the nanostructure geometry. We investigate the position-space information entropy as an indicator of the entanglement in this system. We also consider the expectation value of the Coulomb interaction and the ratio of this expectation to the expectation of the confining potential and their link to the entanglement. We look at the first derivative of the entanglement and the position-space information entropy to infer information about a possible quantum phase transition.Comment: 3 pages, 2 figures, to appear in Journal of Applied Physic

Developing Students' Ability of Mathematical Connection Through Using Outdoor Mathematics Learning

The Purpose of this study is to determine the achievement and improvement of students' mathematical connectionability through using outdoor mathematics learning. 64 students from the fifth grade of Primary School at SDN 65 and SDN 67 Bengkulu City were taken as the sample of this study. While the method of the research used in this research is experiment with quasi-experimental designs non-equivalent control group. The results of the study are as follows: (1) There is an increasing ability found in mathematical connection of students whom taught by using outdoors mathematics learning is 0,53; (2) Based on statical computation that achievement of students' ability of mathematical connection is taught by using outdoor mathematics learning score is 71,25. It is higher than the students score 66,25 which were taught by using the conventional learning. So as to improve students' mathematical connection, teachers are suggested to use the outdoors mathematics learnin

A novel Multi-permittivity Cylindrical Dielectric Resonator Antenna for Wideband Applications

In this paper, a novel multi-permittivity cylindrical dielectric resonator antenna for wideband application is presented. The multi-permittivity cylinder is formed by combining two different permittivity material sectors in such a way that each sector (with constant permittivity) is 90 degree apart. A direct microstrip line coupling terminated with T-stub at the open end is used to excite the multi-permittivity cylindrical dielectric resonator. The angular position of the multi sector dielectric resonator with respect to the longitudinal axis of the microstrip line and length of the additional strip at the open end of the feeding circuit is key parameters for wideband operation of the antenna. By optimizing all parameters of the proposed antenna, wideband impedance bandwidth of 56% (12.1 GHz - 21.65 GHz) is achieved. The average gain of the antenna throughout the bandwidth is 5.9 dB with good radiation properties in both E-plane and H-plane. A well matched simulation and experimental results show that the antenna is suitable for wideband applications

Peningkatan Kemampuan Komunikasi Matematik Melalui Pembelajaran Matematika Realistik

Tujuan penelitian ini adalah untuk mengetahui pencapaian dan peningkatan kemampuan komunikasi matematik siswa Sekolah Menengah Pertama Kota Bengkulu melalui Pembelajaran Matematika Realistik. Metode penelitian yang digunakan adalah kuasi eksperimen dengan non-equivalent control group design. Hasil penelitian sebagai berikut. Pembelajaran Matematika Realistik lebih efektif dalam pencapaian dan peningkatan kemampuan komunikasi matematik siswa dibandingkan pembelajaran konvensional. Besarnya pencapaian kemampuan komunikasi matematik siswa yang diajar melalui pembelajaran matematika realistik adalah 63,96 dan pembelajaran konvensional adalah 47,46. Sementara itu, besarnya peningkatan kemampuan komunikasi matematik siswa yang diajar melalui pembelajaran matematika realistik adalah 0,51 dan pembelajaran konvensional 0,24. The purpose of this study is to determine the achievement and improvement of students' mathematical communication ability in Bengkulu City Junior High School through realistic mathematics learning. The method used is a quasi-experimental non-equivalent control group design. The results of this study as follows. The realistic mathematics learning is more effective in the achievement and improvement of students' mathematical communication ability than conventional learning. The magnitude of the achievement of students' mathematical communication ability in realistic mathematics learning is 63,96 and conventional learning is 47,46. Meanwhile, the magnitude of the improvement of students' mathematical communication ability is realistic mathematics learning is 0,51 and conventional learning is 0,2

Membangun Kemandirian Belajar Siswa Melalui Pembelajaran Matematika Realistik

The Purpose of this study is to determine the achievement and improvement of self regulated learning student through realistics mathematics learning. This study use a quasi-experimental design by the non-equivalent control group. The results are realistics mathematics learning more effectively in the achievement and improvement of self regulated learning student is compared conventional learning. Differences achievement and improvement in both groups is significant. The magnitude of the achievement of self regulated learning student is taught through realistics mathematics learning is 176.85, while self regulated learning student is taught through conventional learning is 172.96. While, the magnitude of the increase in self regulated learning student is taught realistic mathematics learning is 0.1, if it is compared with conventional learning

Effect of confinement potential geometry on entanglement in quantum dot-based nanostructures

We calculate the spatial entanglement between two electrons trapped in a nanostructure for a broad class of confinement potentials, including single and double quantum dots, and core-shell quantum dot structures. By using a parametrized confinement potential, we are able to switch from one structure to the others with continuity and to analyze how the entanglement is influenced by the changes in the confinement geometry. We calculate the many-body wave function by `exact' diagonalization of the time independent Schr\"odinger equation. We discuss the relationship between the entanglement and specific cuts of the wave function, and show that the wave function at a single highly symmetric point could be a good indicator for the entanglement content of the system. We analyze the counterintuitive relationship between spatial entanglement and Coulomb interaction, which connects maxima (minima) of the first to minima (maxima) of the latter. We introduce a potential quantum phase transition which relates quantum states characterized by different spatial topology. Finally we show that by varying shape, range and strength of the confinement potential, it is possible to induce strong and rapid variations of the entanglement between the two electrons. This property may be used to tailor nanostructures according to the level of entanglement required by a specific application.Comment: 10 pages, 8 figures and 1 tabl

An interpretation of the double T-S maxima in the Mediterranean outflow using chemical tracers

TSD observations of the Mediterranean outflow into the N.E. Atlantic were supplemented by measurements of nitrate, silicate, and phosphate. Apart from the normal salinity maximum at 1200 m, the occurrence of a T-S maximum at a depth of about 700 m in the Atlantic has often been observed. The chemical data suggest that this upper maximum is due to the release of water from a relatively shallow depth in the Straits of Gibraltar

Full-Smart Intermittent Water Supply Monitoring, Managing, and Distributing System Based on IoT

Water supply scarcity has become a serious problem for many countries and cities, especially in the last few years when there has been less rain in many areas. So, managing, monitoring, and distributing the water supply and consumption of the people has become an urgent task for many local and national governments. Monitoring how the water is used by the population in different regions helps a lot in the more efficient management of the water supply, thus helping in solving the water scarcity problem. The proposed system includes continuous water level monitoring of wells and storage reservoirs in the city, as well as continuous monitoring of the daily water consumption needs of each household in each neighborhood based on a group of criteria such as the number of residents, the area of green space, and the temperature of the air. This is followed by a fair amount of water being automatically distributed at regular periods to each consumer based on the estimated total amount of water. This is done through smart water meters, remote actuation of valves, and remote water pumps based on IoT devices, which are all under the supervision of a web-based system. Moreover, an application has been developed for use by consumers so that they can monitor their water consumption, be informed about the next water distribution time and the amount of predicted water, check the water meter status, check the air in water pipes, and water bill inquiry and payment

Chronic Pancreatitis

Chronic pancreatitis is a progressive inflammation in pancreas results in fibrosis and irreversible damage lead to loss of exocrine and endocrine function. Mortality and complication rate is high. Appropriate management of chronic pancreatitis begin from accurate diagnosis to adequate treatment. Diagnosis is still a challenge for clinician, mostly in early-stage disease. Several diagnostic modalities such computed tomography scan, magnetic resonance cholangiopancreaticography, endoscopic ultrasound, endoscopic retrograde cholangiopancreaticography, and direct-indirect pancreatic function test help diagnosis establishment. Endoscopic approach has an important role, both during diagnosis and treatment