It is reported (Estevez-Delgado and Estevez-Delgado in Eur Phys J C 78:673, 2018) recently, that the absence of anisotropic in compact object pressure leads to a solution which is not physically ...acceptable due to the energy density and speed of sound can not be positive at the origin at the same time. Here, we calculate the pressure and energy density of NSs using realistic EOS predicted by a relativistic mean-field model including hyperons for isotropic and three different anisotropic pressure models such as the one of Doneva and Yazadjiev (Phys Rev D 85:124023, 2012), the one of Herrera and Barreto (Phys Rev D 88:084022, 2013), and the one of Bowers and Liang (Astrophys J 188:657, 1974). We obtain that the all of energy conditions of perfect fluid are satisfied not only by anisotropic NSs profiles but also the one of isotropic NSs.
Motivated by a recent report by Biwas and Bose (Phys Rev D 99:104002, 2019) that the observations of GW170817 to constrain the extent of pressure anisotropy in neutron stars within Bower–Liang ...anisotropic model, we systematically study the effects of anisotropic pressure on properties of the neutron stars with hyperons. The equation of state is calculated using the relativistic mean-field model with a BSP parameter set to determine nucleonic coupling constants and by using SU(6) and hyperon potential depths to determine hyperonic coupling constants. We investigate three models of anisotropic pressure known in literature namely Bowers and Liang (Astrophys J 88:657, 1974), Horvat et al. (Class Quant Grav 28:025009, 2011), and Cosenza et al. (J Math Phys (NY) 22:118, 1981). The reliability of the equation of state used is checked by comparing the parameters of the corresponding EOS to recent experimental data. The mass–radius, moment of inertia, and tidal deformability results of Bowers–Liang, Horvat et al., and Cosenza et al. anisotropic models are compared to the corresponding recent results extracted from the analysis of some NS observation data. We have found that the radii predicted by anisotropic NS are sensitive to the anisotropic model used and the results obtained by using the model proposed by Horvat et al. with anisotropic free parameter
Υ
≈
-
1.15 are relative compatible with all taken constraints.
Abstract
One strategy of communities to easily embrace ecological awareness is by involving directly in the improvement of their environmental quality. This paper discusses the case study research of ...the co-design process of the neighborhood regeneration project in Kampung Tongkol at the Ciliwung riverbank, Jakarta. This project is carried out collaboratively involving residents of the area and facilitated by ASF (Architecture Sans Frontières) Indonesia. The main important object of this regeneration project is the construction of a self-supporting sample house. This house aims as an ideal model which another neighborhood can replicate. Residents are directly involved in the organizing, the design process, to the construction stage. The primary purpose of regeneration is to improve the quality of the residential environment. The principles of sustainable design are employed as the main guidance from the beginning of the process. This study concludes that the final achievement of this project not only results in a higher quality environment but also raises the ecological awareness of the residents of the neighborhood.
The aim of this paper is to analyze programs and policies run by national and foreign oil companies that affect the level of the economy of the people in Tjepu. While historical research usually ...focuses on events that are presented in chronological order, this study will add to the study of linkages between historical agencies/actors and the environment relating to the quality of the economy from generation to generation in the exploration and exploitation of national and foreign oil companies in Tjepu. This study uses historical methods, especially in collecting literature and field data including interviewing a number of people related to oil mining activities. The results of this study indicate that there are positive and negative sides of the existence of national and foreign oil companies operating in Tjepu. The existence of oil companies is opening up employment opportunities for local residents although the number is limited. In addition, the existence of oil companies also encourages the emergence of small businesses such as restaurants and other service businesses. But on the other hand, pollution due to mining activities also affects the health level of the community and pollutes the ground water in Tjepu
Abstract
Sweet corn is generally grown in monoculture with wide spacing because it is easier to do but less effective and efficient in using resources, which cause the microclimate around sweet corn ...to be not optimal for its growth. Intercropping can improve the microclimate due to the presence of intercrops between the sweet corn. The type of intercrops affect the microclimate around sweet corn. This research aims to determine the effect of various legumes on the abiotic environment and find the legumes that can create an optimal abiotic environment for sweet corn. This research was conducted in 2019 using a single factor experimental method that arranged in a complete randomized block design with three blocks as replications. The treatments were legumes consisting of peanuts, soybeans, cowpeas, red beans, and mung beans. In addition, sweet corn is also planted in monoculture as a control. The research results showed that legumes among sweet corn could decrease daylight intensity above soil level with the most significant light extinction coefficient on the intercropping of sweet corn with soybeans, but has no significant effect on soil temperature and humidity. Soybeans and cowpeas are more suitable as intercrops on sweet corn intercropping to improve the environment.
Abstract
The characteristics of metals are very important to know in order to get optimal utilisation. In this research, a system for measuring the heat propagation of various types of metals is ...developed. Measurements will be made using a number of LM35 sensors placed scattered on the metal to be tested. In this research, Arduino is used to read the data through ADC which then sends the data to the computer. The data is then processed simultaneously for several metal samples so that the heat propagation of each can be compared. The fixed parameters used in this research are the area of each plate and also the distance between the plates. Finally, the success of the method to measure the heat propagation of different metals is reported. Further results can be developed to identify different types of metals and their purity.
This research is intended to design project-based vocational courses which focus on CAD construction drawing course using e-learning. The main objective is improving the student's competence in ...drawing by decomposing the Project-Based Learning (PBL) using flipped classroom strategy with providing course materials in e-learning. The development procedure is arranged as follow: survey and identification, planning, designing, and developing phases. For preparing the planning and designing phase, observations, course reviews, and surveys had been conducted as the result of this current paper as follows: 1) How to decide the vocational course; 2) Student's readiness to access personal computer; 3) Designing PBL steps. Observation, courses review, and group discussion were done for determining the course subject. Surveys were held to know the availability of the course to be conducted with minimum facilities and the student readiness to access personal computer, and determined the principles activities considered for the success of this course project by decomposing the PBL approach and flipped classroom strategy, group discussions had been done to get the views of the vocational teachers and lecturers. The results show that the CAD construction drawing is selected as the vocational course; the student's readiness to access personal computer and their positive opinion of the e - learning is in the very high category; the teachers and lecturers approved the development of CAD construction drawing course using e-learning to be conducted and give the recommendation to do the seven PBL steps.
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