Exploration of potential regional resources for beef cattle farming development in West Java, Indonesia

More than 90% of cattle in Indonesia are raised by smallholder farmer. They are facing limited land resources so that the input of feed mostly depend on the agriculture waste and its environment. The aimed of this study was to determine the potential agricultural resources which influence to the development of beef cattle. The sample locations were 3 districts from the eastern part of West Java province. Panel data of variables that were thought have an effect on beef cattle development were taken from 2012 to 2019 in three regencies. These data were analyses by Multiple Regression Model using the OLS method. The stationary test was done before using time series data by unit root tests of Augmented Dickey-Fuller. The results of this research showed that the corn and Cassava production, as well as the population as a source of agriculture labor in a region was potential resources to increase of beef cattle population. The integration of cattle and corn farming on suitable land in a region needs to be considered as the strategy in beef cattle farming development, because the corn production per unit of land can produce the highest feed compared to the other food crop residues.

Do Quality Standards Affect the Growth of the Fisheries Sector in Cameroon?

This article aim’s to assess the effect of quality standards on the growth of the fisheries sector in Cameroon. Cobb-Douglas function, the Autoregressive Distributed Lag (ARDL) estimation method and the stationary test (Augmented Dicky Fuller and Phillip Perron tests) were employed. In the light of the results obtained, we noted that in the short term, the quality standards are negatively and significantly correlated with the growth of the fisheries sector in Cameroon, but in the long term, we observed a positive correlation. Indeed, a 10% strengthening of quality standards is accompanied by a decrease in the growth of the Cameroonian fisheries sector of about 8.61%. Faced with the demanding nature of quality standards and with a view to making the fisheries sector efficient and attractive in the long term, we recommend that the public authorities implement a national strategy based on effective and relevant management of human and financial resources, aimed at supporting fisher folk on one hand, and on the other hand, improving the quality of institutions.

Modeling Coronavirus Pandemic Using Univariate and Multivariate Models: The Nigerian Perspective

Corona virus Disease, a disease which was discovered in December, 2019 has been spreading worldwide like wildfire. In view of this, there is need of continuous findings on the impact, consequence and possible medications of the pandemic in Nigeria and the world at large. Therefore, this research is aimed at Analyzing the spread of Coronavirus pandemic in Nigeria, using univariate and multivariate models namely;(ARIMA) and (ARIMAX). The daily data used in this research was obtained from the NCDC official website dated from 19th April, 2020 to 20th April, 2021 with total of 384 observations using R and Eview10 software for the analysis. Three different variables were examined. The variables are; total confirmed, discharged and death cases for the purpose of establishing reliable forecast, for better decision making and a helping technique for drastic action in reducing the day to day spread of the pandemic. Summary statistics and stationary test were checked with the data being stationary at the first difference and design technique was conducted as well. Also, best fitted model was selected using Akaike Information Criteria (AIC). The ARIMA (1,1,3) model with an exogenous variable was chosen from the ARIMA models with minimum AIC. From the model, a prediction of sixty-days forecast showed the upward trend of the total confirmed cases of the pandemic in the country. The government on its part via its task force can use the predicted line to take much necessary measures and emphases on taking COVID-19 vaccines so as to prevent further spread of the virus

Simulation research of the strength of an engine mount in an aircraft piston diesel engine

The article presents strength simulations of a mount for mounting the test engine. Mounted on a stationary test stand, this mount consists of external fixings, fixings to stabilize the engine and tubular elements as a truss. These tubular elements are pipes made of seamless black steel. The material of the truss is S235JR steel. The article examines three different versions of the mount: mount no. 1 - initial mount, mount no. 2 - mount after a modification of pipe arrangement, mount no. 3 - mount after a modification of pipe wall thickness. For each version of the mount and subsequent calculation steps, the same boundary conditions and results legend were assumed. All calculations were made in Catia v5 in the Generative Structure Analysis module. To reflect the conditions prevailing during the engine operation on the test bench, the following conditions as mount load were adopted: gravity from the engine mass as 1000 N; engine thrust as 5000 N, and engine torque as 227 Nm. First, the model was pre-calculated to check the influence of mesh size on the obtained results. 2 mm parabolic tetrahedral elements were used in a computational grid. All subsequent steps of the mount modification showed a positive effect of reducing the maximum stress values or their mitigation as dispersion over a larger area. The changes made it possible to eliminate potentially dangerous areas of stress accumulation points. The material used has a strength several times greater than the stresses occurring in the tested elements. It was found that no further modifications to the mount are required and it is possible to use the created geometry on the test stand.

Validation of Climate Hazard Group InfraRed Precipitation with Station (CHIRPS) Data in Wonorejo Reservoir, Indonesia

This study aims to test the validation of precipitation data from CHIRPS compared to measurement data. The study location is Wonorejo Reservoir, Indonesia. The methods in this research were 1) data quality test with the consistency test and stationary test, and 2) validity test with parameters of NSE value and correlation. The study results show that 1) The data quality test shows that the precipitation data from CHIRPS are consistent and homogeneous; 2) The validity test is carried out in two stages, for uncorrected data and corrected data. According to NSE value, the validity of test results on uncorrected data shows that CHIRPS’s precipitation data are unsatisfactory. When viewed from the correlation, the precipitation data from CHIRPS has a very strong relationship to precipitation measurement data. The next step is to test the validity of the corrected data. The validation test of corrected data shows that precipitation data from CHIRPS is satisfactory according to NSE value. Moreover, the precipitation data from CHIRPS strongly correlates with the precipitation measurement data. This study indicates that the precipitation data from CHIRPS can be utilized as alternative precipitation data if measurement data are limited.

Peran Biaya Operasional Dan Pendapatan Operasional Dalam Hubungan Pembiayaan Dengan Return On Asset Pada Bank Umum Syariah Di Indonesia

This study aims to analyze the effect of mudharabah financing, murabahah financing, and ijarah financing on return on assets (ROA) with operating costs and operating income (BOPO) as intervening variables. This research is quantitative research using secondary data in panel data with a purposive sampling technique. The sample used is three Islamic commercial banks registered with the financial services authority from 2017 to 2020. Data analysis includes descriptive test, stationary test, regression test, classical assumption test, path analysis test, and Sobel test. The results of this study indicate that mudharabah financing and ijarah financing do not affect ROA. Murabahah and BOPO financing has negative and significant effects on ROA. BOPO did not mediate the effect of mudharabah, murabahah, and ijarah financing on ROA.

Research of ecological indicators of two-way vehicle in stationary conditions

The article concerns the research on the emission of pollutants of a rail-road tractor in two stationary research tests. The purpose of the tests was to carry out control tests of pollutant emissions and their analysis. The object used during the works was approved in accordance with the Stage V standard, which requires measurements of emissivity both in stationary, dynamic and real conditions. Despite the requirement to test engines installed on a vehicle during their normal duty cycle with PEMS, the emission limits measured in this test have not yet been defined. Therefore, the work below focuses on the stationary test cycle. The measurements were carried out in accordance with the combustion engine operating points described in the approval test, and then compared with the modernized NRSC test. It contains modified measuring points and rotational speeds of the crankshaft, adopted on the basis of the most common operating parameters of agricultural tractor combustion engines in real operating conditions. The measurements were performed with the use of a mobile dynamometer and devices for measuring emissions of harmful exhaust gas compounds and recording on-board data. In the test, the vehicle drive system worked at fixed operating points, with defined values of crankshaft rotational speed and load. Based on the recorded data on the concentrations of pollutants in the exhaust gases, the specific emission of the object was determined. In the final stage of the work, these data were used to perform a comparative analysis with the emission limits contained in the standard.

A Concept for Conducting Scientific Studies in Vehicles and Stationary Test Rooms during the COVID-19 Pandemic

The COVID-19 pandemic affected many areas of public life and industry. This also applies to research particularly that relies on scientific studies with test persons. In order to minimize the risk of infection, several aspects of experiment design including the setting might require alteration. An extensive review of the latest research involving the COVID-19 pandemic as a blueprint for dealing with other health situations has been conducted in order to develop a step-by-step approach to plan a study with regard to infection protection. As a result, a generic six-step concept was developed that is applicable for scientific studies in both stationary rooms and vehicles while being adaptable to the respective circumstances. The infection protection measures determined through research were implemented in the individual sub-steps from study planning to execution. They allow a step-by-step approach to prevent infections in scientific studies with different settings during a pandemic and in situations where increased hygiene measures are required.