We propose the late-O, early-B star IRS2b as the ionizing source of the Flame Nebula (NGC 2024). It has been clear that such a hot, massive star must be present in this heavily obscured region, and now it has been identified. New nearinfrared photometry shows that IRS2b is the most luminous and hottest star in the young star cluster embedded in the center of NGC 2024. The near-infrared observat...

Purpose: In this work, fatigue crack propagation life of 7020 T7 and 2024 T3 aluminum alloys under the influence of load ratio was predicted by using artificial neural network (ANN). Design/methodology/approach: Numerous phenomenological models have been proposed for predicting fatigue life of the components under the influence of load ratio to take into account the mean load effect. Findings: ...

Social innovation (SI) is a potential solution to various problems and challenges in the agriculture sector. Agri-tech start-ups can be considered important agents for developing SI In Indonesia, agri-tech are also expected develop sustainable agricultural development medium-term national plan 2020–2024. Using multiple case studies, this paper attempts complement currently available literature ...

We report an optical photometric survey of 0.89 deg of the Orion OB1b association centered on Ori. This region includes most of the Ori cluster, the highest-density region within Orion OB1b. We have developed a statistical procedure to identify the young, low-mass, pre–main-sequence population of the association. We estimate that the cluster has 160 members in the mass range (0:2 M 1:0 M ). The...

We present deep 3.6 cm radio continuum observations of the H II region NGC 2024 in Orion B obtained using the Very Large Array in its A-configuration, with 0. 2 angular resolution. We detect a total of 25 compact radio sources in a region of 4 × 4. We discuss the nature of these sources and its relation with the infrared and X-ray objects in the region. At least two of the radio sources are obs...