A quantum heat engine with coupled superconducting resonators

We propose a quantum heat engine composed of two superconducting transmission line resonators interacting with each other via an optomechanical-like coupling. One resonator is periodically excited by a thermal pump. The incoherently driven resonator induces coherent oscillations in the other one due to the coupling. A limit cycle, indicating finite power output, emerges in the thermodynamical phase space. The system implements an all-electrical analog of a photonic piston. Instead of mechanical motion, the power output is obtained as a coherent electrical charging in our case. We explore the differences between the quantum and classical descriptions of our system by solving the quantum master equation and classical Langevin equations. Specifically, we calculate the mean number of excitations, second-order coherence, as well as the entropy, temperature, power and mean energy to reveal the signatures of quantum behavior in the statistical and thermodynamic properties of the system. We find evidence of a quantum enhancement in the power output of the engine at low temperatures.Comment: 15 pages, 14 figures, new references adde

Phase randomisation: a convergence diagnostic test for MCMC

Most MCMC users address the convergence problem by applying diagnostic tools to the output produced by running their samplers. Potentially useful diagnostics may be borrowed from diverse areas such as time series. One such method is phase randomisation. The aim of this paper is to describe this method in the context of MCMC, summarise its characteristics, and contrast its performance with those of the more common diagnostic tests for MCMC. It is observed that the new tool contributes information about third and higher order cumulant behaviour which is important in characterising certain forms of nonlinearity and nonstationarity.Convergence diagnostics; higher cumulants; Markov Chain Monte Carlo; non-linear time series; stationarity; surrogate series

Food Safety Knowledge and Practice Among Community in Sg. Pelek, Sepang, Selangor Darul Ehsan

Food safety is a basic requirement of food quality. It is an increasingly important public health issue to prevent and control food borne illnesses. A cross-sectional study was designed to determine level of knowledge and practice on food safety, to determine the association between knowledge and practice, and also to identify the association between socio-demographic factors and practice score of the population studied. This study was conducted among adult population in Taman Bahagia, Sungai Pelek, Sepang, Selangor Darul Ehsan. Data were collected using an interviewed structured questionnaire. A stratified random sampling was performed to obtain houses, followed by simple random sampling to select sample in the house. A total of 115 data sets were analysed using Statistical Package for Social Sciences (SPSS) version 20.0. Analysis showed that 35% of respondents have poor level of knowledge on food safety, whereas 27% of the respondents have poor level of practices on food safety. Multiple linear regression revealed that there are a significant association between education level (p<0.001), Adj b=2.57 (95% CI: 1.15, 3.99) and gender (p=0.048), Adj b=1.15 (95% CI: 0.01, 2.29) with practice score on food safety. Therefore, health promotion and education on the importance of practicing food safety at home should be focused to prevent further unwanted health effects

Parents' Roles in Preventing Drug Abuses Among Teenagers (a Case Study in Banda Aceh)

Drug abuse has became a serious problem and related to many aspects of human beings physically, psychologically, socially, etc. It is also leaded to early death, physical disability, social lost, economic impact, etc. Therefore, it is highly recommended appropriated approaches in preventing drug abuse. One basic purpose of this research was to find out the parents' roles in preventing drug abuse among teenagers. That parent is obligated to educate their children as a main responsibility to God by having the children. Children are educated regularly in any occasions and conditions. The research applied the qualitative approach where the data collection was interview. The research location was in Banda Aceh. In addition, the samples of the study were unemployed and employed parents. The results of the research describes the efforts of parents in preventing their children from abusing drug, parents' role as supervisors, indeed, parents should know their children friends, solving family problems, collaborating with educational institutions (schools or universities), collaborating with home environment, morever, it could be understood that to stop drug abuse need all parties involvement. Ideally, it should be started from the family. It is believed family is the first “school” for children. The role of parents however is very important in preventing drug abuse as a role model, a guider, a supervisor, in addition, parents need to know their children friends, to solve family problems, to collaborate with educational institutions (schools or universities),and to collaborate with environment nearby the home

Pengaruh Keterampilan Kepemimpinan Kepala Sekolah Dan Motivasi Kerja Guru Terhadap Kinerja Guru SMP Negeri Di Sub Rayon 03 Kabupaten Jepara

. The purpose of this study is to know the influence of principal leadership skill and work motivation on the teachers?óÔé¼Ôäó performance at Junior High Schools Sub-Cluster 03, Jepara. Total number of population was 364 from 13 Junior High Schools while number of the sample was 78 respondents taken proportionaly. From the result of the study, it is known that the average score of principal leadership skill is 124,29, the average score of teacher work motivation is 99,04 and the average score of teacher performance is 112,45. The results of pre-requisite test were normally distributed, homogenous, linier, non multicollinear and do not occur heteroskedacity. From the hypothesis test, it is discovered the positive influence of principal leadership skill on teacher performance which is stated by the equation Y = 82,966 + 0,590 X1, the strength of correlation is 0,499 with the 24% of contribution. There is positive influence of teacher work motivation on teacher?é?á performance which is stated by the equation Y = 83,599 + 0,734 X2, the strength of correlation 0,476 with 21,6% of contribution. There is positive influence of principal leadership skill and teacher work motivation together on teacher performance which is stated by the equation Y= 40,715 + 0,571 X1 + 0,475 X2, correlation strength 0,614 with 36% of contribution

Pengaruh Model Pembelajaran dan Kemampuan Awal terhadap Hasil Belajar dan Kemampuan Berpikir Tingkat Tinggi

Teachers in SMAN 1 Turen had tried to apply innovative learning models but some problems occurred in the implementation. The improvement of learning quality which emphasized on learning process could be done by giving students scientific experience. The scientific experience which was implemented in Hypothetical-Deductive Learning Cycle (HDLC), Student Teams Achievement Divisions (STAD) and Direct Instruction method (DI) was expected to be able to improve the students\u27 achievement and higher order thinking skills. This research aimed to know the difference of the effect of using HDLC, STAD and DI based on prior knowledge on the chemical equilibrium toward achievement and high ordered thinking skill of XI IPA SMAN 1 Turen students. This research used a quasi experiment design with factorial design: 3x2. The research was performed in SMAN 1 Turen, research sample were chosen using cluster random sampling technique, consist of 3 classes, which are XI IPA 2 class (36 students) using HDLC, XI IPA 3 class (36 students) using STAD and XI IPA 4 class using MPL. The Instrument validity and reliability test showed that 30 questions were valid with content validity of 95,3% and the reliability of 0,917. Data was analyzed using program Statistical Package for Social Sciences 16.0 version for windows on significance degree a(alpha)= 0,05 with ANOVA test. The research showed that (1) There was a difference on students\u27 achievement and high order thinking skills of science XI SMAN 1 Turen students using HDLC, STAD and DI on the chemical equilibrium; (2) There was a difference on students\u27 achievement and high order thinking skills of science XI SMAN 1 Turen students with high and low level of prior knowledge on the chemical equilibrium; (3) There was a difference of students\u27 achievement and high ordered thinking skill using HDLC, STAD and DI with different prior knowledge

Determination of flow resistance coefficient for vegetation in open channel: laboratory study

This study focused on determination of flow resistances coefficient for grass in an open channel. Laboratory works were conducted to examine the effects of varying of roughness elements on the flume to determine flow resistance coefficient and also to determine the optimum flow resistance with five different flow rate, Q. Laboratory study with two type of vegetation which are Cow Grass and Pearl Grass were implementing to the bed of a flume. The roughness coefficient, n value is determine using Manning’s equation while Soil Conservation Services (SCS) method was used to determine the surface resistance. From the experiment, the flow resistance coefficient for Cow Grass in range 0.0008 - 0.0039 while Pearl Grass value for the flow resistance coefficient are in between 0.0013 - 0.0054. As a conclusion the vegetation roughness value in open channel are depends on density, distribution type of vegetation used and physical characteristic of the vegetation itsel