Judul: Pengembangan Modul Termometer Elektronik Multichannel dengan Sensor Termokopel untuk Pengamatan Iklim Mikro
Abstrak: Instrumentation in meteorological sector is growing, particularly in the electronic base. Although it’s not as good as conventional equipment but the accuracy of electronic measurement can be better and the construction is more simple. Micro-climate is the climate conditions in a very limited space so the climate elements will experience a significant change in the scale of space or time. In micro-climate, especially in the air temperature observations, requires a fast response time and the output data must be avoid from the effects of thermal sensors (self heating) and can be monitored continuously. Thermocouple construction methods that have multiple channel temperature sensor with the same temperature reference and using the data logger will make temperature measurements at several observation point becomes more efficient, affordable, and can be monitored continuously. The sequence circuit and op-amp circuit are the main key in this research. T type thermocouple sensor is used because it has small form and can be connected easily, and also has affordable price and sensitivity to 40.6 μV/oC derived from the output thermoelectric effects. The use of oscillator block as a timer to send the temperature measurement data were considered not enough for fast response time observations. The use of the personal computer (PC) power supply makes the data interference (noise). The data output that resulted in sequential and follow the diurnal temperature change pattern proves the module can work well. The module still need a further research to improve the power supply to reduce noise (interference data) or by developing software to correct the data error.
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Judul: Pemanfaatan modul transmitter-receiver untuk pengukuran telemetri unsur-unsur cuaca
Abstrak: Telemetry is transfer of information at a certain radio frequency of the transmitter to the receiver system with air intermediaries. Telemetry system will be useful for the measurement process with the direct method requires measuring device is placed in a location difficult to monitor at all times. A universal transmitter-receiver modules in available the market have different characteristic and specifications depend on manufacturers. The antenna is modified to maximize the distance of data transmission. The separation time between the incoming data is detected down to 0.32 second and the minimum signal pulse length can be detected by the module is 0.3 second. The farthest distance of data transmission obtained after modifying the antenna is 260 meters, maximum results are obtained if the modification is only made to any one of the modules. Faulty measurement due to timming conflict and power supply instability are about 3 % of the whole measurement.
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Judul: Pengaruh pemupukan N dan P terhadap produksi dan vigor benih kedelai (Glycine max (L) Merr,)
Abstrak: Sedangkan jumlah polong dan produksi dipengaruhi baik oleh pemupukan N maupun P. Dosis pupuk 22.5 kg N/ha dan 90 kg P205/ha adalah yang terbaik untuk meningkatkan jumlah polong dan produksi. Komponen produksi yang lain- nya tidak dipengaruhi oleh pemupukan N maupun P. milik Pemberian pupuk 22.5 kg N/ha dan 90 kg P205/ha sudah cukup untuk menghasilkan benih yang bervigor tinggi, karena mempunyai nilai hasil perkalian baik antara produksi dengan kecepatan tumbuh maupun produksi dengan Valk yang paling besar. Benih kedelai yang dihasilkan dari pemupukan 22.5 kg N/ha dan 90 kg P205/ha akan mempunyai kekuatan tumbuh yang tinggi serta memiliki daya simpan yang tinggi.
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