Ahmad Jahrudin’s scientific contributions

Minat belajar siswa di Tambelang pada umumnya masih kurang, hal itu dikarenakan berbagai faktor, diantaranya faktor ekonomi dan lingkungan. Selain itu dari yang kami amati di Tambelang merupakan salah satu kecamatan yang berada di kabupaten Bekasi, dimana banyak sekali industri atau pabrik yang merupakan salah satu target atau harapan para siswa dapat bekerja di salah satu kawasan atau pabrik untuk menjadi karyawan di sana, oleh sebab itu kami membuat pengabdian kepada masyarakat guna meningkatkan motivasi untuk jenjang pendidikan yang lebih tinggi atau membangun minat kuliah kepada siswa-siswa kelas 12 di SMAN 1 Tambelang. Adapun metode yang kami terapkan adalah ceramah dan diskusi dan untuk mengukur hasil, kami wawancara langsung para peserta, dari hasil wawancara ternyata masih banyak siswa yang masih ragu untuk melanjutkan kuliah dan lebih memilih untuk bekerja dikawasan karena faktor ekonomi, namun jumlah siswa yang ingin melanjutkan bertambah dibandingkan sebelum kegiatan motivasi.

Kegiatan pengabdian ini dilatarbelakangi permasalahan mitra yang diidentifikasikan meliputi (1)Kurangnya kreativitas guru dalam menggunakan media pembelajaran terutama untuk penunjang praktikum fisika, (2) Pergeseran perubahan proses pembelajaran secara daring di era new normal tahun 2020 memaksakan guru dan siswa untuk belajar secara online dirumah, (3) Guru SMA fisika di Kabupaten Lebak banyak tidak tahu beberapa praktikum virtual yang digunakan untuk mengajar, memfasilitasi dan memotivasi kreativitas guru dan siswa. Perkembangan teknologi informasi dan komunikasi di era digital ini telah membawa perubahan yang signifikan dalam perkembangan dunia pendidikan. Pemanfaatan perkembangan teknologi dalam pembelajaran, khususnya dalam pembelajaran fisika. Adapun solusi untuk permasalahan pada mitra yaitu memberikan pelatihan cara pengunaan PhET simulation . Abdimas ini fokus dalam meningkatkan kreativitas guru dalam menggunakan praktikum virtual dengan PhET simulation sehingga praktikum dapat dilaksanakan dirumah dengan online. Metode yang dilakukan adalah ceramah berbasis praktikum online, diskusi dan umpan balik. Hasil dari pelaksanaan kegiatan pengabdian masyarakat ini yaitu untuk memberikan pemahaman dan penjelasan tentang cara menggunkan praktikum virtual dengan PhET Simulation . Selanjutnya para guru mendapatkan materi tentang cara menggunakan praktikum virtual dengan PhET simulation . Tindak lanjut abdimas ini adalah peserta membuat lembar kerja praktikum secara mandiri.

Dimasa pandemi saat ini, kegiatan pengabdian kepada masyarakat ini bertujuan untuk mendeskripsikan pelaksanaan pelatihan penyusunan dan penulisan laporan penelitian tindakan kelas (PTK) dan mengukur tingkat ketercapaian pemahaman peserta dalam menyusun dan menulis laporan penelitian tindakan kelas (PTK). Dalam kegiatan pelatihan ini sasaran pesertanya adalah guru-guru MGMP di Kabupaten Serang. Metode pada pelatihan ini menggunakan metode diskusi dan simulasi atau pelatihan secara daring melalui aplikasi zoom. Pelaksanaan dalam program pengabdian kepada masyarakat ini terbagi menjadi tiga tahap yaitu tahap persiapan, tahap pelaksaan, dan tahap evaluasi. Teknik pengumpulan data berupa kuesioner dan dokumentasi hasil pelatihan yang diberikan setiap akhir pertemuan yang digunakan untuk perbaikan kualitas pelatihan. Denagan hasil kuisioner setelah kegiatan yang menyatakan bahwa mitra sangat puas dan setuju dengan kegiatan pelatihan serta antusias jika akan diadakan kegiatan pengadian kepada masyarakat lagi di masa yang akan datang. Peserta termotivasi, dan memiliki kemampuan untuk melakukan, menyusun, dan menyajikan laporan hasil penelitian tindakan kelas (PTK) mencapai 82%.

Numerical simulation of the satellites’s orbital velocity and orbital period on the earth has been performed. This research aimed to study satellites’s orbital velocity and orbital period on the earthbased on position function. Velocity equation has been gotten from modification equation of centripetal force and equation of earth’s gravitational force. Through numerical calculation of orbital velocityand orbital period equation by function discretization, we got that the velocity and period of satellite at height of 30000 km above the earth’s surface are 3.31 km/s and 19.18 hours, respectively.

In a highly developed era, of course, it will require the use of electricity to continue to increase, and the problem is to meet the high electricity demand, on the other hand the construction of electricity infrastructure that takes a long time will hamper the supply of electricity, therefore renewable energy sources are needed to overcome this problem. that's why we tried to make Magneto Electrical. Magneto Electrical is a Future Energy Source created to provide a safe, efficient, and environmentally friendly source of electrical energy. The purpose of this research is to design and manufacture Magneto Electrical: Future Energy Sources. The research method used is research and development (R&D). This research method is used to research so that it can produce new products and then test their effectiveness. Magneto Electrical works based on Faraday's Law, namely when a conductor is rotated in a magnetic field so that it cuts the magnetic lines at the end of the conductor, an emf (line of electric force) will be generated. Through this research, researchers have succeeded in designing and making Magneto Electrical: Future Electrical Energy Sources. By utilizing the repulsion between magnets so that motion energy is produced which is then converted into electrical energy. From the tests that have been carried out, it was found that the tool made is capable of producing 15 Volts of electrical energy.

The exploration of oil and gas, especially in Indonesia is experiencing various challenges and varying degrees of difficulty. In this research, the researcher tries to make a 3D modeling from gravity data, where the model will show a structure to determine the central coordinates for drilling. Pertamina has carried out drilling at a location in NTT and it turns out that the well does not produce oil and gas, even though the log data reads an oil showing that the area should have the prospect of producing oil, but the wells that have been drilled do not show any oil or gas, therefore the researchers tried to make a 3D model determine the structure around the production well. In this research, it was seen that the area of the previous drilling point had deviated from the top of the up dome and it was also seen in this structure that the area was deviated by about 3 kilometers and depth must exceed 526 m, the researcher concluded that the drilling point must be at X, Y coordinates.

The vehicle is an important requirement for daily activities. The increasing number of vehicles in Indonesia from year to year correlates with the worsening air quality, especially in big cities like Jakarta. Data also shows that 70% of air pollution in Jakarta comes from motorized vehicles that use fossil fuels. One source of energy that can be an alternative solution is electric-powered vehicles because they have advantages, which are not producing pollution. Electric vehicles generally use lithium batteries as a source of electric power. Lithium batteries that have been used up are generally just thrown away without going through the processing so that they will contaminate water and soil. Therefore, we want to make vehicles that are not dependent on fossil fuels, produce no pollution, and can do auto charging electric so they don't rely on PLN electricity. This vehicle can charge independently because it has an electromagnetic coil on the rear wheel that will produce GGL induction from the wheel rotation when the bike is moving. We call this vehicle MOBERAK (Environmentally Friendly Fuel-Free Motorbike).

3D inversion modeling of subsurface based on gravity anomaly data and magnetic anomaly data used for identification hydrocarbon potential in “x”. Where in the study area there are up dome structures that indicate some possibilities, including igneous rock intrusion, carbonate build up and also mud diapir. 3D inversion modeling of gravity and magnetic anomaly data correlated with two seismic section which available in study location. 3D inversion model is performed on the residual anomaly data on the gravity model and 2D in the magnetic anomaly. The result of 3D inversion modeling of gravity anomaly data shows that the peak up dome is at a depth of study located around 800 meters from the surface, this result corresponds to spectrum analysis and depth on the seismic cross section, while the density value of the up-dome body is approximately 2.78 g/cm3. While on the magnetic anomaly that has been done, structure of the dome indicates an intrusion structure with anomaly susceptibilities show the structure of igneous rock.