Judul: Effect of Monday-Thursday Fasting on Working Memory of Adult Human
Abstrak: Human being performs complex mental processes which include memory. In daily life memory is used in a dynamic system called working memory. Working memory is a system and process that holds and manipulates information temporarily in the brain. To perform memory task, human brain needs sufficient glucose pertaining to its energy demand. Fasting is a condition when there is no glucose intake to the body temporarily. Previous study shows that fasting gave positive effect on working memory of teenagers but gave no effect on college students. Present study aims to find out whether or not fasting influence memory performance of adult human. Visual working memory of each subject was tested using Delayed Matching To Sample (DMS) task. This test was done in fasting and non-fasting condition. Data were analyzed using Linear Model implemented in stat package of R program. Result shows that fasting did not affect memory performance both in reaction time and accomplished level. The absence of any effect is due to homeostasis system in the body. Learning effect and habituation are more considered to affect working memory performance.
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Judul: Effect Of Monday-Thursday Fasting On Cognitive Function
Abstrak: Human memory is a complex cognitive function. Based on its storage capacity, memory can be distinguished into two kinds. They are short-term and long-term memories. A kind of shortterm memory is called working memory. Working memory is a limited capacity system that holds items of information transiently in mind in the service of comprehension, thinking, and planning. To perform cognitive task, brain requires large energy. Fasting declines blood glucose concentration similar to skipping breakfast. Many people in Indonesia habitually perform fasting every Monday and Thursday irrespective of the month. The Monday-Thursday fasting therefore provides a model of how habitual fasting influences performances on working memory task. Present research used Delayed Matching to Sample paradigm is a widely used method to study visuospatial working memory in human and animal. Test was analyzed by linear mixed effect statistical model using statistical language S which is implemented in lme4 package of program R. Result shows that performance of visuospatial working memory task did not affected by Monday- Thursday fasting and its duration. It also did not affected by sleep length, and did not differ between male and female. It increased session by session which reflect the ability of subjects to learn the pictorial stimuli.
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Judul: Kerusakan bantalan rel kereta api di wilaya inspeksi 2 jalan dan bangunan perusahaan jawatan kereta api (pjka),cirebon
Abstrak: Kereta api merupakan salah satu sarana angkutan yang murah, cepat dan aman serta dapat mengangkut barang dalam jumlah besar. Kelancaran operasi sarana angkutan tersebut banyak ditentukan oleh kondisi jalan rel, termasuk kondisi bantalannya. Dalam hal ini bantalan rel kereta api dapat dibuat dari kayu, logam, atau beton. Namun demikian kayu merupakan bahan yang paling banyak digunakan sebagai pembuat bantalan rel kereta api di berbagai negara. Kenyataan menunjukkan bahwa kayu yang digunakan sebagai bantalan rel kereta api sering mengalami berbagai macam kerusakan yang menyebabkan bantalan tidak berfungsi lagi atau menurun fungsinya. Di Indonesia, informasi mengenai jenis dan tingkat kerusakan bantalan kayu masih sangat kurang, pada- hal informasi tersebut sangat penting sebagai dasar pertimbangan dalam rangka pemeliharaan jalan kereta api, agar umur pakainya (service life) lebih lama.
Keyword: bantalan rel