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Articles 200 Documents

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Synthesis of 2-Methoxy-3H-Azepine Derived Compounds Through the Thermal Reaction between Alkylnitrobenzene and Tributylphosphine Siti Mariyah Ulfa; Hideki Okamoto; Kyosuke Satake
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Although photolysis of phenyazide has been widely reported to give 3H-azepine, the thermal deoxygenation reaction of alkylnitrobenzene derived similar products hitherto unexplored. Novel synthesis of 2-methoxy-3H-azepine derivatives was carried out using alkylnitrobenzene with tributylphosphine (Bu3P) reacted at 150°C for 24 hours in the presence of methanol. Reaction of m-nitrobenzene with the above methods gave two isomers of 3H-azepine, namely, 2-methoxy-6-methyl-3H-azepine and 2-methoxy-4-methyl-3H-azepine in 61%. Reaction of 2,3-dimethylnitrobenzene with Bu3P afforded the three isomers, that is, 2-methoxy-6,7-dimethyl-3H-azepine; 2-methoxy-3,4-dimethyl-3H-azepine and 7-methoxy-5,6-dimethyl-4H-azepine. Reaction of 3,5-dimethylnitrobenzene gave the sole product of 2-methoxy-4,6-dimethyl-3H-azepine in 42%. In contrast, reaction of 2,6-dimethylnitrobenzene didn’t give any product because the steric effect of methyl groups attached on C2 and C6. Structure elucidation of all novel products have confirmed by HETCOR.

Microtremor and Geolistrik Resistivity Study Around the Trans Timor Primary Arterial Road for Disaster Mitigation Harti Umbu Mala; Adi Susilo; Sunaryo Sunaryo
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

The research on microtremor and geoelectric resistivity around Trans Timor Primary Artery Road to disaster mitigation, has been done. The aims of this research were to obtain the Peak Ground Acceleration (PGA) value, the soil dominant frequency, seismic vulnerability index and to estimate the thickness of sediment layer. Microtremor data collection was done by using a three-component seismometer, DS-4A feedback short-period, at 52 points with 250 m interval. Dominant frequency and amplification factors were obtained by using curve analysis method, horizontal to vertical spectral ratio (HVSR). The PGA value was calculated using Kanai empirical equations, where the data of dominant period were obtained from the inversion of frequency values while the parameters of the earthquake were based on seismic events in the last 50 years, from 1963 to 2013 with magnitude of ≥ 3. Geoelectric measurements were conducted using a Resistivity-meter OYO, based on Wenner Schlumberger configuration and it was divided into two lines, with length of 400 m each. From the results obtained by PGA value is ranged between 80 and 500 gal with level of risk moderate two to very large one. The distribution value of the soil dominant frequency was 0.62 Hz-18.27 Hz, while the distribution of the seismic vulnerability index ranged from 0.21 to 21.83. The type of soil is dominated by clay and alluvium as top soil and its thickness varies from 10 m to 50 m, strengthened by limestone as bedrock.

Anomalious Trends in Electromagnetic As Earthquake Precursors With Related Parameters at the Port Ratu Observatory Angga Setiyo Prayogo; Bambang Sunardi
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Research on electromagnetic anomalies as earthquake precursor was performed in many places and time. Pelabuhan Ratu Observatory. For validation, correlation between anomaly value and time length with earthquake that recorded at Pelabuhan Ratu Geophysical Observatory and have electromagnetic anomaly. Goals of this research were analyze correlation between anomaly pattern value and time length to earthquake magnitud and Rhypo. Data processed by polarization ratio and impedance of electromagnetic at ultra low frequency spectrum, the correlation method using regression and physical analysis between parameter. Data that used was electromagnetic and earthquake data that recorded and perceived at geophysical observatories of Pelabuhan Ratu. Results of electromagnetic anomaly value with magnetic polarization ratio was varies in 0.1 until 9.5, and also time length between 4 until 39 days before earthquake. Value of anomaly with impedance method was varies in 3.01 until 16.1, and also time length between 4 until 32 days before earthquake. In conclusion, known that trend correlation of the appearance of anomalous values and ranges of magnitude and distance Rhypo with magnetic polarization method showed a positive correlation, whereas a negative correlation with the impedance method. Negative correlation also obtained on relationship between Rhypoand magnitude of the span of time and the value of the polarization anomaly

Estimation of Seepage Zone at Bajulmati Dam, Banyuwangi Regency Based on Litology Analysis Using Magnetic Data Hanna Azizah Rahmah; Adi Susilo; Arief Rachmansyah
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

A research regarding seeping in Bajulmati Dam of Banyuwangi Regency based on lithology analysis by geomagnetic data has been done to discover the location of zone with seeping potential. This research is done by analyzing lithology from magnetic data (primary data) that was acquired from the field that covers the area of Bajulmati Dam. The research began with the acquisition of magnetic data using PPM (proton procession Magnetometer). Acquired data is then corrected by diurnal and IGRF correction, reduction in to even surface, upward continuation as well as reduction to the pole. Local anomaly contour is acquired with the value ranging from -1000 nT up to 700 nT at loop 1 and ranging from -2800 nT up to 1600 nT at loop 2. Based on the result of data processing by magnetic method, the subsurface layers beneath the said dam consist of the layer of clay (tuff), sandstone, gravel, and volcanic lava. By analyzing the mentioned results, some cracks are located in AA’ line with the measurement point of 20 m and 90 m, and in the 120 m and 160 m, 80 m and 100 m measurement point of BB’, and CC’ line respectively. Those cracks can be expected to cause seepage in Bajulmati Dam.

Influence of Rice Seed Replanting Growth (Oryza sativa L.) Inpari-4 Varieties with Giving Frequency of Sound Waves Bahtiar, Bahtiar; Widodo, Chomsin S.; Santoso, Didik R.
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Has done research that aims to examine the influence of sound wave frequency of rice seeds of the shoots phase. Rice seeds Inpari-4 varieties planted at four growing medium in the sterofoam box with the treatment of the different frequncies of 10 Hz, 4 kHz, 7 kHz, 30 kHz and one growing medium without sound treatment which serves as the control plants. Â The test parameters were often observed as an indicator of plant, a lot of leaves, wet and dry weight of roots, root lenght, moisture content and test unison is growing. The result showed that there is a sound wave frequency value responded well by rice seed shoots in the process so that its growth into the optimal frequency of 4 kHz.Â

Eligibility of MEMS Accelerometer As Velocitymeter Rinda S. Ariyani; Didik R. Santoso; Ahmad Nadhir
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Vibration can be measured by measuring each of several parameter, for example displacement, velocity and acceleration.There are many sensor that can be used in this measurement. Velocitymeter and accelerometer are the examples of vibration sensors. Accelerometer, generally use to measure acceleration, can be modified to measure velocity of vibration as the velocitymeter done. Accelerometer MEMS MMA7361L with the signal conditioning circuits, that is band pass filter and integrator, had been designed and assembled to measure the velocity of vibration. Velocity signal is produced in this circuit because of the integration process from integrator circuit. In design application, this circuits have a good performance in low frequency measurement like the velocitymeter done. But in practical, there are some deficiencies. This circuits can measure 0,86 Hz – 2,99 Hz frequency of low amplitude signal. The signal that is measured is about 1 volt below. Signal also have some distortion in negative swing. Hence, other new component for this real design is very needed to upgrade the performance of circuit in producing a good and non distortion signal for recording and displaying system easily. The output signal of circuit is velocity signal but it is still cannot be said to be the true measuring data. By adding calibration and the right formula, the magnitude of velocity can be gainned, so that this circuit can be said to be feasible as velocitymeter.

Effect of Hydroxyquinoline on Preparation of Chromosome Roots and Garlic Garlic (Allium sativum L.) Arbaul Fauziah
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

The effective method in making chromosome prepararation was able to count the number of chromosome easier, especially for analysis the ploidy level in plants. Garlic (Allium sativum L.) is one of the plants that the chromosome is difficult to be counted because their chromosomes are long and difficult to spread during the squashing. This research was to find out the effect of hydroxiquinoline on making chromosome preparation of root and callus in garlic. The steps of making chromosome preparation were fixation in Farmer’s fluid, put in hydroxiquinoline for an hour, hydrolysis in 1N HCl for two minutes at 60°C, put in Carnoy for 30 minutes, and stained in 1% aceto orcein for 20 minutes. The treatment were gift hydroxiquinoline for an hour after put in fixative fluid and the control were making preparation without gift hydroxiquinoline. The result of this research suggest that the method of making preparation by treatment with hydroxiquinoline for an hour after fixation produced the chromosomes that the stain were sharp and contrast, and also it produced well spread chromosomes that were clearly defined of both callus and root tip in garlic.

Plankton Community at Segara Anak Lake Gunung Rinjani National Park Taufik Arianto; Imam Bachtiar; Lalu Japa
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Plankton community was studied at the Lake of Segara Anak, Lombok Island, Indonesia. The purpose of this study was to describe community structure of plankton and to explore spatial and temporal pattern. The results show there were 39 species of phytoplankton and 5 species of zooplankton. Species diversity and similarity indices of phytoplankton were 3.064 and 0.029 respectively, while the species diversity and similarity indices of zooplankton were 1.352 and 0.060 respectively. Statistical analysis showed no significant difference spatially and temporally on the species richness, abundance, diversity index and similarity index of zooplankton and phytoplankton. Significant difference was only found on the average of species richnes and diversity index of zooplankton between the surface and the bottom of the lake.

Inventory of Medicinal Plants in Kampung Adat Urug, Urug Village, Sukajaya District, Bogor Regency Muhammad Qais Izzuddin; Rodiyati Azrianingsih
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

This research purposed to find out species, preparation and uses of medicinal plants in Kampung Adat Urug. Ethnobotanical survey was conducted from November 2013 until May 2014 using interview (semi-structured) and observation activities. The respondents were determinated by snowball sampling with the head of Kampung Adat Urug as a key informant. The observation was conducted for documenting medicinal plants based on respondent recomendation. Data gained from this activity was qualitatively described. Medicinal plants used by the Kampung Urug were 53 species singly and 5 herbs. Those species belonged 27 families. The most recomended medicinal plants were Cardamom and Bitung Bamboo. Those plants often to treat cough with dringking extraxted water from trunk (dituak). Bitung Bamboo shoot soup is used to prevent aging. In Kampung Adat Urug, traditional midwife often use medicinal plants to make herbs for healing any diseases, such as headache, stomachache, kidney problem, and also increasing stamina for adult and women after pregnant. Medicinal plants and herbs which were recomended by respondents were adequate treatment for any diseases because they have evidences between ethic and emic

Spatial Modeling Weibull-3 Survival Parameters with Frailty Distributed Conditionally Autoregressive (CAR) Nur Mahmudah; Henny Pramoedyo
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Survival analysis is a collection of statistical procedures for data analyzing, where respon variables caused by time until an event occurs. One of application of survival regression’s purpose is to know dengue hemorragic fever. Since the spread of dengue hemorragic fever caused by the spread of mosquito, there is probability that event in one location affects other event in another locations thus, it is better to model with Bayessian method of spatial survival. Model includes random spatial effect CAR to overcome the spatial effect in survival model using queen contiguity type weight. This study aimed to obtain spatial survival model one survival data year of 2013 which was the event of dengue hemorragic fever in city of Malang. Based on the data, moran value I was -0.5930 with Z-test value equal to -2,002, which means there is a spatial autocorelation on the event of dengue hemorragic fever in city of Malang. Spatial survival model with Weibull-3 Parameter (Weibull-3P) distribution obtained the factors significantly affecting dengue hemorragic fever, which were sex, hematrocit rate, thrombocyte volume had equal rate of healing in each subdistrict.

Page 13 of 20 | Total Record : 200

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