Pemodelan Dan Analisa Uji Pendulum Pada Struktur Rangka Bus Menggunakan Metode Elemen Hingga

Bus merupakan salah satu kendaraan bermotor yang dapat membawa banyak penumpang. Oleh sebab itu, bus harus didesain agar dapat memberikan rasa aman bagi penumpang dan pengemudinya. Struktur rangka bus adalah salah satu bagian dari sebuah bus yang berfungsi sebagai rumah-rumah dari kendaraan tersebut. Dalam berbagai kasus kecelakaan, struktur rangka sangat mempengaruhi keselamatan dari pengguna bus. Salah satu diantaranya yaitu kecelakaan bus terguling (rollover), dimana kecelakaan tersebut mengakibatkan korban mengalami cedera bahkan menewaskan penumpang di dalam bus. Di Eropa, terdapat standar bus yang mengatur keamanan bus ketika terjadi kecelakaan rollover, yaitu ECE R 66. Tugas akhir ini membahas tegangan dan displacement pada struktur rangka bus ketika terjadi kecelakaan terguling untuk mengukur keamanan bus sesuai dengan standar ECE R 66. Penerapan dari ECE R 66 dilakukan dengan memberikan beban pendulum pada sisi samping bus dengan kecepatan dan sudut pendulum yang ditentukan berdasarkan dimensi bus. Penulis melakukan analisa dengan mengunakan metode elemen hingga dan dengan software bantu ANSYS / LS - Dyna. Hasil analisa berupa konsentrasi tegangan dan displacement pada bagian sisi samping struktur rangka bus. Besarnya displacement pada bagian tersebut tidak melebihi ruang batas selamat (residual space). Oleh karena itu, struktur rangka bus ini aman jika terkena beban pendulum atau kecelakaan terguling (rollover)

Internalizing Islamic Values in Electrochemistry Learning

The purpose of this paper is to describe a potential way of integrating the knowledge of electrochemistry with a story in the Al-Quran particularly in the sura of Al-Kahfi, verse 83-96. The story tells about an implicit understanding of the concept of electro chemistry. Having the story in the learning of electrochemistry is aimed to internalizing the spirit of Islam in the learning of electro chemistry. Using a classroom action research, this study involved 95 students who are taking the course of Basic Chemistry 2. This study used three instruments, namely: observation sheet of students activity, observation sheet of students attitute, and self-assessment questionnaire. Based on the data, the study found that students were considerably active in each stage of the learning process with the average of activitiy is 78% (good). With regards to attitude, only aspect of responsibility that was not well appeared while the aspects of religious curiosity, cooperative, and communication relatively presente

Javan Leaf Monkey (Trachypithecus Auratus) Movement in a Fragmented Habitat, at Bromo Tengger Semeru National Park, East Java, Indonesia

Pergerakan Lutung budeng (Trachypithecus auratus) didaerah habitat terfragmentasi Taman Nasional Bromo Tengger Semeru, Jawa Timur, Indonesia. Pergerakan lutung budeng di daerah habitat terfragmentasi diamati dengan metode transek. Hasil kajian menunjukkan bahwaada empat kelompok masing masing beranggotakan 12 (grup A), 16 (grup B), 15 (grup C) dan 12 lutung (grup D). Penelitian yang dilakukan disekitar hunian penduduk, jalan, hutan terdegradasi dan jalan-jalan setapak mengindikasikan bahwa lutung dalam aktivitas hariannya memerlukan waktu 32,82% diantaranya digunakan untuk makan, 30,97% untuk istirahat dansisanya 31,79 untuk pergerakan perpindahan. Lutung dalam aktivitasnya 50,53% menggunakan wilayah puncak kanopi tumbuhan, 41,99%menggunakan kanopi tumbuhan bagian tengah dan hanya 2,49 % yang menggunakan kanopi bawah

Analisis Perbandingan Metode TAM dan Metode UTAUT 2 dalam Mengukur Kesuksesan Penerapan SIMRS pada Rumah Sakit Wijaya Kusuma DKT Purwokerto

Guidelines regarding the development of health services by the community indirectly require the management and executors of health services to provide services in an optimal and professional manner. With the help of information systems, it is expected to help management to achieve improved health services. This study aims to analyze the success of the application of the Hospital Management Information System (SIMRS), especially the medical record information system applied at Wijaya Kusuma Hospital, DKT Purwokerto. The TAM and UTAUT 2 methods are used by several researchers to measure the success of the application of information systems based on the wishes of users / consumers in using information systems. The TAM method was developed to explain the behavior of information system users. Placing attitude factors and each user behavior with the construct. UTAUT 2 is a development of the previous method which aims to help companies / organizations to understand how the use of information technology in supporting company / organizational performance Comparison of the final results of both methods is done to determine the extent to which the success of information systems can be explained by the two analysis results. produced. The final result stated that a better method was used in the success of the hospital management information system at Wijaya Kusuma Hospital, DKT Purwokerto, namely the UTAUT 2 method because the UTAUT method was able to measure 2,109 while the TAM method only measured 1,782

PENGARUH PEMANFAATAN FLY ASH DAN CHEMICAL ADDITIVE TERHADAP DAYA DUKUNG LAPIS PONDASI TANAH SEMEN

Berdasarkan Pedoman Perencanaan Stabilisasi Tanah dengan Bahan Serbuk Pengikat untuk Konstruksi Jalan tahun 2007, lapisan tanah semen mempunyai nilai CBR 35% untuk lapis pondasi bawah dan 90% untuk lapis pondasi atas, dimana kebutuhan semen rata-rata untuk tanah lanau dan lempung berkisar antara 7% hingga 20%. Tanah lempung umumnya mempunyai nilai CBR berkisar < 3%. Fly ash merupakan limbah bersifat pozzolanic yang dapat meningkatkan kekuatan tanah dasar hingga mampu dijadikan sebagai lapis pondasi jalan. Chemical Additive (Difa Soil Stabilizer) merupakan bahan yang mampu memaksimalkan ikatan antara tanah, fly ash dan semen. Oleh sebab itu penelitian ini bertujuan untuk memanfaatkan fly ash dan Difa SS dalam melakukan stabilisasi tanah semen. Pengujian CBR unsoaked dan soaked dilakukan pada benda uji dengan penambahan fly ash variasi 5%, 10%, 15% dan 20% terhadap berat kering tanah dan Difa SS 2,5% terhadap berat fly ash sehingga didapatkan kadar fly ash optimum. Fly ash optimum ditambahkan semen bervariasi 5%; 7,5%; 10%; 12,5%; dan 15% serta Difa Soil Stabilizer 2,5% terhadap berat semen. Hasil pengujian menunjukkan, penambahan fly ash, semen dan Difa Soil Stabilizer mampu merubah sifat plastisitas tanah, menurunkan potensi pengembangan, menurunkan kadar air optimum menaikkan berat volume kering tanah, sehingga mampu menaikkan nilai CBR. Penambahan kadar semen minimal sebanyak 10,5% dari berat tanah dapat meningkatkan daya dukung tanah (nilai CBR soaked) yaitu sebesar 35%, yang mana nilai tersebut adalah batas minimum nilai CBR lapis pondasi bawah berdasarkan persyaratan Departemen Pekerjaan Umum 2007

The Use of Matrix Heat Pipe as Photovoltaic Cooler

The high surface temperature can decrease the efficiency of solar cells. This research aim is to decrease the temperature of the solar cell using the matrix heat pipe as a heat conductor. The study began by constructing a matrix of heat pipes. ¼ inch diameter copper tubing (6.3 mm) pressed until it reaches a thickness of 4.2 mm. Heat pipe using 10 mesh wire screen and water as the working fluid as about 20% of the volume of the pipe. Twenty-five heat pipes arranged matrix configuration. The pipes were vacuumed to pressure 0.0799 bar. Flat heat pipe were placed below the surface of the solar cell. Phase change liquid-gas of work fluid on the heat pipe occurs at saturated temperature of 42ºC. This heat pipe reduces surface temperature of solar cell as 8ºC and increase efficiency of solar cell as 1.6%

Application of corrosion e-module to improve high-level thinking ability

The media used in learning can be used as an alternative effort to improve the ability of high-level thinking. Therefore, the purpose of this study is to apply corrosion e-module to improve students' high-level thinking ability. The method used is pre-experiment with research subjects as much as 38 students of Chemistry Education second semester. Information is obtained by measuring the improvement of students' high-level thinking ability. The n-gain value in cognitive analyzes is 0.639 with moderate improvement category, the cognitive rate is evaluated at 0.543 with the category of moderate increase and the cognitive level created by 0.73 with the high increase category. Overall n-gain students' high thinking ability is 0.637 with moderate improvement category. This shows the teaching materials in the form of emodule play a role in activating the learning process that impact on learning outcomes. Thus, corrosion learning using e-module can improve students' high-level thinking ability

Contribution of maternal adherence to the effect of multiple micronutrient supplementation during pregnancy: a systematic review and individual participant data meta-analysis

Multiple micronutrient supplements (MMS) in pregnancy reduces the risk of infant low birthweight (LBW) and improves other maternal and infant outcomes as compared to iron-folic acid supplements (IFA) alone. However, the impact of timing of initiation and adherence on the MMS effectiveness in real-world programs remains unclear. To address this, we conducted a two-stage individual participant data meta-analysis that included 15 randomized trials (61,204 pregnant women) and assessed whether the relative effect of MMS differed by: adherence alone; adherence in combination with gestational age at initiation; and the total number of tablets taken. We also evaluated the observational association of these factors with outcomes among participants who received MMS. Compared to IFA; the relative effect of MMS on the primary outcome of continuous birthweight was greater with higher adherence (p-value for interaction<0.05). Among women who took ≥90% of supplements, MMS increased birthweight by 56g (95%CI: 45, 67g), while among women who took <60% of supplements, there was no difference in birthweight between MMS and IFA (mean difference (MD): 9g; 95%CI: -17, 35). Higher adherence was also associated with greater effect of MMS on LBW and birthweight-for-gestational age centile and women who took more supplements experienced a greater relative impact of MMS on birthweight-for-gestational age centile and small-for-gestational age births (SGA) as compared to IFA. Observational analyses among participants who received MMS showed that ≥90% adherence was associated with increased birthweight (MD: 44g; 95%CI: 31, 56) and lower risk of LBW (RR: 0.93; 95%CI: 0.88, 0.98) and SGA (RR: 0.95; 95%CI: 0.93, 0.98), while <75% adherence was associated with a greater risk of stillbirth (RR: 1.43; 95%CI: 1.12, 1.83) and maternal anemia (RR: 1.26; 95%CI: 1.11, 1.43) as compared to 75-90% adherence. Programs should invest in strategies that promote early initiation and high adherence to MMS. PROSPERO ID: CRD42022319207

The Use of Steel Slag as Substitution of Coarse Aggregate on Indirect Tensile Strength and Marshall Properties of AC-WC

Abstract High traffic levels on road can causing road damage, especially cases of permanent deformation and fatigue cracking. One solution is to utilize waste of material, such as steel slag as coarse aggregate and polymer modified asphalt as binding material. This paper explores experimental laboratory investigation on the use of steel slag on Marshall characteristics and indirect tensile strength of AC-WC mixture by using Starbit E-60 and Pen 60/70. Laboratory works begin with physical testing of material, then, finding the optimum bitumen content (OBC) for each type of the mixtures. Finally, Marshall Standard and indirect tensile strength (ITS) at OBC were conducted. Results shows that the use of steel slag for AC-WC mixture are proven to improve resistance to permanent deformation as well as fatigue cracking. Substitution of steel slag for coarse aggregates were able to increase Marshall stability, Marshall Quotient and indirect tensile strength (ITS) of the mixtures, however, it slightly decreases the volumetric performance of mixture, such as voids in total mixes become higher and voids filled with asphalt as well as voids in mineral aggregates tend to decrease.</jats:p