Handy, Benjamin

HQ Detachment 80th Sing HU Cens Battalionhttps://dh.howard.edu/prom_members/1035/thumbnail.jp

Handy, Benny (2)

https://dh.howard.edu/prom_corres/1047/thumbnail.jp

Handy, Benny

https://dh.howard.edu/prom_corres/1046/thumbnail.jp

On the importance of background subtraction in the analysis of coronal loops observed with TRACE

In the framework of TRACE coronal observations, we compare the analysis and diagnostics of a loop after subtracting the background with two different and independent methods. The dataset includes sequences of images in the 171 A, 195 A filter bands of TRACE. One background subtraction method consists in taking as background values those obtained from interpolation between concentric strips around the analyzed loop. The other method is a pixel-to-pixel subtraction of the final image when the loop had completely faded out, already used by Reale & Ciaravella 2006. We compare the emission distributions along the loop obtained with the two methods and find that they are considerably different. We find differences as well in the related derive filter ratio and temperature profiles. In particular, the pixel-to-pixel subtraction leads to coherent diagnostics of a cooling loop. With the other subtraction the diagnostics are much less clear. The background subtraction is a delicate issue in the analysis of a loop. The pixel-to-pixel subtraction appears to be more reliable, but its application is not always possible. Subtraction from interpolation between surrounding regions can produce higher systematic errors, because of intersecting structures and of the large amount of subtracted emission in TRACE observations.Comment: 9 pages, 9 figure

Observations of a solar flare and filament eruption in Lyman <span class='mathrm'>α</span> and X-rays

&lt;p&gt;&lt;b&gt;Context&lt;/b&gt;: L&#945; is a strong chromospheric emission line, which has been relatively rarely observed in flares. The Transition Region and Coronal Explorer (TRACE) has a broad “Lyman &#945;” channel centered at 1216 Å used primarily at the beginning of the mission. A small number of flares were observed in this channel.&lt;/p&gt; &lt;p&gt;&lt;b&gt;Aims&lt;/b&gt;: We aim to characterise the appearance and behaviour of a flare and filament ejection which occurred on 8th September 1999 and was observed by TRACE in L&#945;, as well as by the Yohkoh Soft and Hard X-ray telescopes. We explore the flare energetics and its spatial and temporal evolution. We have in mind the fact that the L&#945; line is a target for the Extreme Ultraviolet Imaging telescope (EUI) which has been selected for the Solar Orbiter mission, as well as the LYOT telescope on the proposed SMESE mission.&lt;/p&gt; &lt;p&gt;&lt;b&gt;Methods&lt;/b&gt;: We use imaging data from the TRACE 1216 Å, 1600 Å and 171 Å channels, and the Yohkoh hard and soft X-ray telescopes. A correction is applied to the TRACE data to obtain a better estimate of the pure L&#945; signature. The L&#945;  power is obtained from a knowledge of the TRACE response function, and the flare electron energy budget is estimated by interpreting Yohkoh/HXT emission in the context of the collisional thick target model.&lt;/p&gt; &lt;p&gt;&lt;b&gt;Results&lt;/b&gt;: We find that the L&#945;  flare is characterised by strong, compact footpoints (smaller than the UV ribbons) which correlate well with HXR footpoints. The L&#945; power radiated by the flare footpoints can be estimated, and is found to be on the order of 1026 erg s-1 at the peak. This is less than 10% of the power inferred for the electrons which generate the co-spatial HXR emission, and can thus readily be provided by them. The early stages of the filament eruption that accompany the flare are also visible, and show a diffuse, roughly circular spreading sheet-like morphology, with embedded denser blobs.&lt;/p&gt; &lt;p&gt;&lt;b&gt;Conclusions&lt;/b&gt;: On the basis of this observation, we conclude that flare and filament observations in the L&#945; line with the planned EUI and LYOT telescopes will provide valuable insight into solar flare evolution and energetics, especially when accompanied by HXR imaging and spectroscopy.&lt;/p&gt

Kesiapsiagaan Siswa dalam Menghadapi Bencana Gempa Bumi dan Letusan Gunung Api Soputan(Studi Kasus pada SMA Negeri 1 Tombatu dan SD GMIM 1 Silian)

Telah dilakukan penelitian untuk mengetahui pengaruh penyuluhan dan sosialisasi pengetahuan tentang gempa bumi dan letusan gunung api terhadap kesiapsiagaan siswa menghadapi kedua bencana ini pada SMA Negeri 1 Tombatu dan SD GMIM 1 Silian. Penelitian ini menggunakan bersifat deskriptif yaitu penelitian yang bertujuan untuk melihat gambaran sebab dan akibat antar variabel penelitian tanpa membuat perbandingan atau menghubungkan dengan variabel lain. Sedangkan metode yang digunakan adalah metode survei dengan menggunakan kuesioner yang berisi pertanyaan terstruktur untuk mendapatkan informasi yang spesifik. Data tingkat pengetahuan dan keterampilan menyelamatkan diri dari bencana gempa bumi dan letusan gunung api didapatkan dari hasil pengisiankuesioner pretest dan posttest.. Hasil pengolahan data menunjukan nilai-P sebesar 0,001 dan nilai-T sebesar 3,76 untuk siswa SMA Negeri 1 Tombatu dan nilai-P sebesar 0,000 dan nilai-T sebesar -21,42 untuk siswa SD GMIM 1 Silian. Dari hasil ini dapat ditarik kesimpulan bahwa terdapat peningkatan tingkat pengetahuan dan keterampilan para siswa setelah mendapat penyuluhan dan pelatihan tentang kesiapsiagaan menghadapi bencana gempabumi dan letusan gunungapiResearch had been carried out to investigate the effect of disaster preparedness and mitigation counseling to students in Tombatu Public High School (SMA Negeri 1 Tombatu) and GMIM Elementary Private School in Silian (SD GMIM 1 Silian). Descriptive survey was used in this research by using questionnaire that contained structured question to get specific information needed for this research. The students knowledge and skill for surviving earthquake and volcanic eruption are measured with pretest and posttest questionnaire.  The result obtained from questionnaire shows that P-value is 0,001 and T-value is 3.76 for students in SMA Negeri 1 Tombatu and P-value is 0,000 and T-value is -21.42 for students in SD GMIM 1 Silian. From this result we conclude that disaster preparedness and mitigation counseling can give significance to students knowledge and skill for surviving earthquake and volcanic eruption

Analisis Pengaruh Radiasi Gelombang Mikro Pada Struktur Kristal Pati (Starch)

Penelitian ini bertujuan untuk menganalisa Perubahan struktur Kristal sampel setelah diberi perlakuan awal (pretreatment) dengan cara memanfaatkan radiasi gelombang Elektromagnetik. Alat yang akan digunakan dalam penelitian ini adalah microwave sedangkan sampel atau substrat yang dipilih adalah pati singkong yang telah dihaluskan dan dikeringkan di bawah sinar matahari selama beberapa waktu. Bahan yang telah di pretreatment dengan microwave selanjutnya dilakukan pengukuran dengan menggunakan SEM, XRD dan FTIR. Karakterisasi substrat yang telah mengalami proses pretreatment kemudian dibandingkan dengan sampel alami.SEM menunjukan bahwa permukaan granula dari sampel yang dilakukan pretreatment mengalami Perubahan. Dari pola XRD memperlihatkan Perubahan Kristal menjadi lebih amorf pada sudut antara 15-24°, sedangkan pola FTIR terjadi pergeseran wilayah serapan gelombang inframerah pada sampel yang dilakukan pretreatmentThis research is aimed to analyze the change of sample crystal structure after it was given a pretreatment by utilizing the microwave radiation. The device that was used in this research was a microwave set, while the chosen sample or subtrate was starch which has been mashed and dried under the sunlight for days. Material that was conducted a pretreatment was then measured using SEM, XRD and FTIR. Characterization of the subtrate that has been undergone the pretreatment was then compared to the natural sample.The SEM showed that the granule surface of treated substrate changed while the XRD pattern displayed a transformation to be more amorphous at the angles of 15-24°. The FTIR pattern revealed the absorption of infrared wave shifted for the sample treated by microwave compared to that of original substrate

PEMANFAATAN NIRA AREN MENJADI BIOETANOL UNTUK BAHAN BAKAR EMULSI YANG RAMAH LINGKUNGAN

ABSTRACTThis research purpose is to make gasohol fuel made from a mixture of ethanol and Pertamax as well as ethanol and pertalite. Ethanol used for this mixture has been through the process of reflux fermentation and distillation. Then the ethanol distillation process is carried out to obtain purity above 80%. The next stage is the process of mixing ethanol with Pertalite and Pertamax where the concentration of ethanol that will be mixed with Pertamax and Pertalite to become gasohol varies from 80% to 98% ethanol at 1% intervals. The Pertalite and Pertamax used for each sample was 7 ml while ethanol was added while shaking with a circular motion of the test tube until the solution became one phase. Using 80% ethanol in the mixture produces a Pertalite: pure ethanol: water ratio of 1: 11.65: 2.91 (in volume units), while 98% ethanol in the mixture produces a Pertalite: pure ethanol: water ratio of 1: 0.007 : 0.001 (in units of volume). For Pertamax, the minimum ethanol concentration mixed with Pertamax into a single-phase emulsion is 88% with a composition of 1: 5.91: 0.81. Keywords: ethanol, Pertalite, Pertamax. ABSTRAKPenelitian ini bertujuan untuk membuat bahan bakar gasohol dengan beberapa campuran antara etanol dan Pertamax juga etanol dan Pertalite. Tahapan yang pertama yaitu pembuatan etanol dari nira aren yang sudah terfermentasi. Kemudian dilakukan proses destilasi etanol untuk mendapatkan kemurnian di atas 80%. Tahapan selanjutnya yaitu proses pencampuran etanol dengan Pertalite dan Pertamax dimana konsentrasi etanol yang akan dicampur dengan Pertamax dan Pertalite untuk menjadi gasohol divariasikan mulai dari etanol 80% sampai 98% dengan interval 1%. Pertalite dan Pertamax yang digunakan untuk setiap sampel adalah 7 ml sementara untuk etanol ditambahkan sambil diputar dalam tabung reaksi sampai larutan menjadi satu fasa. Dengan menggunakan etanol 80% dalam campuran menghasilkan perbandingan Pertalite : etanol murni : air adalah 1: 11,65: 2,91 (dalam satuan volume), sementara untuk etanol 98% dalam campuran menghasilkan perbandingan Pertalite : etanol murni : air adalah 1: 0.007: 0.001 (dalam satuan volume). Untuk Pertamax, konsentrasi etanol minimum yang dicampur dengan Pertamax menjadi emulsi satu fase adalah 88% dengan komposisi 1: 5.91: 0.81. Konsentrasi etanol maksimum yang dicampur dengan Pertamax menjadi emulsi satu fase adalah 97% dengan perbandingan  volume Pertamax : etanol murni : air adalah 1: 0,41: 0,02.Kata kunci : etanol, Pertalite, Pertamax