Judul: Mempelajari Pengaruh Tekanan, Ketinggian Operasi Dan Jarak Antara Nosel Terhadap Keseragaman Penyemprotan Pada Alat Semprot Bermotor Tipe "Boom"
Abstrak: Gulma yang tumbuh di tempat yang tidak diinginkan merupakan salah satu faktor yang dapat menurunkan hasil tanaman. Salah satu cara untuk pengendalian gulma adalah dengan menyemprotkan herbisida pada saat gulma belum tumbuh. Adapun untuk menyemprotkan herbisida dilakukan dengan menggunakan mesin yang dapat menghasilkan tekanan seperti mesin semprot (bermotor) tipe "boom". Penelitian ini bertujuan untuk mempelajari pengaruh perbedaan tekanan, ketinggian operasi dan jarak antara nozzle terhadap pola penyebaran dan lebar penutupan penyemprotan untuk pengendalian gulma secara "preemergence" pada alat semprot bermotor tipe "boom". Selain itu dipelajari juga pengaruh perbedaan tekanan dan diameter nozzle terhadap debit penyemprotan serta menentukan tekanan optimum di lapang. Percobaan faktorial 4 x 3 x 3 x 3 digunakan dalam penelitian ini dengan faktor tekanan operasi sebanyak empat taraf, ketinggian operasi dan jarak antara nozzle yang ..dst
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Judul: Mempelajari Pengaruh Tekanan, Ketinggian Operasi dan Jarak antara Nosel terhadap Keseragaman Penyemprotan pada Alat Semprot Bermotir Tipe "Boom"
Abstrak: Gulma yang tumbuh di tempat yang tidak diinginkan rnerupakan salah satu faktor yang dapat menurunkan hasil ta - narnan. Salah satu cara untuk pengendalian gulma adalah dengan rnenyernprotkan herbisida pada saat gulma belum tumbuh. Adapun untuk rnenyernprotkan herbisida dilakukan dengan rnenggunakan mesin yang dapat menghasilkan tekanan se- Perti masin semprot ( bermotor ) tipe "boom".
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Judul: Categorization in Macaca fascicularis.
Abstrak: Categorization is an ability to group individuals or events into different classes mediated by conceptualized mental images. There are several levels of categorization and within a taxonomy the levels are nested. At the most concrete level of categorization, all or most members of the category shared common physical attributes that differ from other categories. The higher the level of category, the fewer common attributes between members of the group. In addition to humans, the ability to categorize has also been proposed in animals. One example of categorization in animal is species discrimination. Using matching-tosample task, present experiment tested ability of the long-tailed macaque (Macaca fascicularis) in discriminating dichotomous-stimuli of different animals. The species has been shown to be able to see photos as representations of real object so I used facial photos of humans and animals for the stimuli. First, I tested their ability to classify humans and macaques into separate group. Second, I tested their ability to discriminate their conspecific from other macaques. And the last, I tested whether the subjects were able to discriminate non-human animals from humans. In all of these experiments I found that the subjects showed high performance in categorizing objects, even when I discarded details of visual informations, such as color and local shapes. The ability to identify objects with reduced representation of physical properties means the subjects were able to generalize attributes of members of the group. This would indicate that the subjects created a higher level abstraction. On the other hand, in discriminating intrageneric macaque species I found that they were able to extract uniqueness of each species. More over, I also found that the subjects were able to put photos of non-human animals that shared very few similarities in physical percepts into one group. I suggested that the subjects could create a more abstract concept based on non-percepts relations as a basis to put the objects into one category. Thus, I concluded that M. fascicularis were able to perform multiple levels of categorizations.
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