An Experiment and Detection Scheme for Cavity-based Cold Dark Matter Searches

A resonance detection scheme and some useful ideas for cavity-based searches of light cold dark matter particles (such as axions) are presented, as an effort to aid in the on-going endeavors in this direction as well as for future experiments, especially in possibly developing a table-top experiment. The scheme is based on our idea of a resonant detector, incorporating an integrated Tunnel Diode (TD) and a GaAs HEMT/HFET (High Electron Mobility Transistor/Heterogenous FET) transistor amplifier, weakly coupled to a cavity in a strong transverse magnetic field. The TD-amplifier combination is suggested as a sensitive and simple technique to facilitate resonance detection within the cavity while maintaining excellent noise performance, whereas our proposed Halbach magnet array could serve as a low-noise and permanent solution replacing the conventional electromagnets scheme. We present some preliminary test results which demonstrate resonance detection from simulated test signals in a small optimal axion mass range with superior Signal-to-Noise Ratios (SNR). Our suggested design also contains an overview of a simpler on-resonance dc signal read-out scheme replacing the complicated heterodyne readout. We believe that all these factors and our propositions could possibly improve or at least simplify the resonance detection and read-out in cavity-based DM particle detection searches (and other spectroscopy applications) and reduce the complications (and associated costs), in addition to reducing the electromagnetic interference and background.Comment: 22 pages, 7 figure

Perbedaan Kemampuan Siswa Menulis Karangan Deskripsi Menggunakan Media Lingkungan Rumah Siswa dan tanpa Media Lingkungan Rumah Siswa di Kelas V SD Negeri Lamreung Aceh Besar

Penelitian ini berjudul “Perbedaan Kemampuan Siswa Menulis Karangan Deskripsi Menggunakan Media Lingkungan Rumah Siswa Dan Tanpa Media Lingkungan Rumah Siswa Di Kelas V Sd Negeri Lamreung Aceh Besar”. Penelitian ini bertujuan untuk mengetahui perbedaan yang signifikan antara siswa yang menggunakan media lingkungan rumah dengan siswa yang tidak menggunakan media lingkungan rumah dalam mengarang deskripsi.Penelitian ini menggunakan pendekatan kuantitatif dengan jenis penelitian deskriptif.Populasi penelitian ini adalah seluruh siswa kelas V pada SD Negeri Lamreung Aceh Besar yang berjumlah 48 orang yang terdiri dari masing-masing 2 kelas paralel yaitu kelas Va berjumlah 24 siswa dimana laki-laki 9 siswa, perempuan 15 siswa. dan Vb berjumlah 24 siswa terdiri dari 14 siswa laki-laki dan 10 siswa perempuan.Teknik pengumpulan data menggunakan tes tidak menggunakan media lingkungan rumah dan tes menggunakan media lingkungan rumah. Tes digunakan sebagai tolak ukur untuk mengetahui hasil yang diperoleh siswa sebelum dan sesudah pemberian tindakan. ternyata , yaitu >1,68, maka hipotesis ditolak dan hipotesis diterima. Dengan demikian terdapat perbedaan nilai tes siswa yang berasal dari kelas Va dan Vb. Sehingga dapat disimpulkan bahwa hasil belajar yang menggunakan media lingkungan rumah dan tidak menggunakan media lingkungan rumah dapat meningkatkan hasil belajar siswa, dapat dilihat dari rata-rata nilai tes yang mengalami peningkatan yang signifikan dari pada hasil belajar siswa yang tidak menggunakan media lingkungan rumah. Oleh sebab itu, penulis sarankan bahwa mengarang deskripsi dengan menggunakan media lingkungan rumah lebih efektif diterapkan, karena akan lebih memudahkan siswa dalam mengarang.

Kemampuan Mengidentifikasi Unsur Intrinsik Cerita Pendek Siswa Kelas V SD Negeri 16 Banda Aceh

Salah satu materi pembelajaran di kelas V SD adalah mngientifikasi unsur intrinsik cerita pendek, Penelitian ini berupaya untuk melihat kemampuan Mengidentifikasi Unsur Intrinsik Cerita Pendek Siswa Kelas V SD Negeri 16 Banda Aceh.Masalah yang diajukan dalam penelitian ini adalah bagaimana tingkat kemampuan siswa dalam mengidentifikasi unsur intrinsik cerita pendek di kelas V SD Negeri 16 Banda Aceh.Tujuan penelitian ini adalah untuk mendeskripsikan secara rinci kemampuan siswa dalam mengidentifikasi unsur intrinsik cerita pendek pada kelas V SD Negeri 16 Banda Aceh.Pendekatan yang digunakan dalam penelitian ini adalah pendekatan kualitatif dalam bentuk deskriptif.Populasi dalam penelitian ini adalah seluruh siswa kelas V SD Negeri 16 Banda Aceh yang berjumlah 63 orang.sampel dalam penelitian ini adalah 30 orang siswa kelas V SD Negeri 16 Banda Aceh.Teknik pengumpulan data yang digunakan dalam penelitian ini berupa tes objektif yaitu berupa 20 soal objektif yang dibagikan kepada siswa.pengolahan data menggunakan teknik statistik deskriptif persentase P= x 100%. Berdasarkan hasil penelitian ini dapat dikemukakan sebagai berikut, nilai rata-rata kemampuan mengidentifikasi unsur intrinsik cerita pendek siswa kelas V SD Negeri 16 Banda Aceh adalah 86. Siswa secara klasikal telah menguasai unsur-unsur intrinsik kecuali unsur sudut pandang, hal ini dapat dibuktikan dengan banyaknya siswa yang tidak mampu menjawab pertanyaan mengenai sudut pandang.Kesimpulan dari penelitian ini adalah tingkat kemampuan mengidentifikasi unsur intrinsik cerita pendek siswa kelas V SD Negeri 16 Banda Aceh termasuk dalam kategori baik.Namun tetap saja siswa perlu memperbanyak latihan membaca dengan sering melakukan kunjungan ke perpustakaan sekolah

The Different Magnetic Results of Anemi and PPM Measurements on the Buried Remains of a 13th Century Fortress

This study aimed to evaluate the different magnetic results of an electromagnetic induction with proton magnetometer measurements on an archaeological site. The electromagnetic induction allows measuring both the apparent magnetic susceptibility in part per thousand (ppt) and the apparent electrical conductivity in millisiemens (mS/m). A proton magnetometer measures the total magnetic intensity in nanotesla (nT), caused by the induced and remanent magnetisations. An archaeological site where historical documents indicated the presence of a 13th century fortress that built by Lamuri Sultanate was selected as a test area. The measurement were conducted by divided the study area into 10 profiles.Some standard data processing have been applied to the measured data. The result of the first survey with electromagnetic induction showed low magnetic anomalies in the buried remains of Lamuri fortress. The similar value are shown as well by low magnetic field intensity in magnetometer measurement

Design of a small-scale solar Dryer to Improve Natural Drying of Vegetables and Fish

This study aimed at improvement of a solar dryer based on the principle of natural–convection used for drying vegetables and fish. The constructed dryer, comprises of three main models, solar collector (tent of polythene sheet collector), drying chamber and solar chimney. Design has been made to eliminate the problem of quality loss and over drying. Okra, Tomato, onion, fish were subjected to solar drying and open – air drying processes. The chemical, microbiological analyses and sensory evaluation were carried out for the dried products. The results gives indication of improved quality for solar dryer compared to products dried in open – air systems which indicates its efficiency in drying. &nbsp

Surface Electromyography of Eyes Potential Behaviour using Wavelet Transform Analysis

The previous study of eyes potential behavior was carried out using Fourier Transform which is found to be working on a single scale. Then, Wavelet Transform was proposed to overcome the limitation. Hence, the objective of this paper is to identify the surface electromyography of eye movement potentials behavior by using Wavelet Transform scalogram analysis. The eye movement signals are detected by using electrodes that are placed on a person’s forehead around the eye. It then recorded the signal using the data acquisition Electroencephalograph Neurofax-9200. The eye moved towards various directions involving 15 humans were identified. The Wavelet scalogram analyzed the eye movement signals by comparing the energy distribution with the change of time and frequency of each signal. The results proved that different surface electromyography of eye movement signals created different signals energy with their corresponding scales. Analysis of variance statistically proved that there was a 99% significance difference between each scale indicating that each eye movement has different frequency bands and energy distribution. These findings could be integrated to design a support machine for paralyzed people to move their robot or wheelchair by using eye movements. Future works should explore the energy and frequency bands distribution within four eye movement signals for better interpretation of surface Electromyography signals analysis by using Wavelet scalogram

Advokasi Dakwah Dalam Budaya Lokal "Balimau" Menyambut Bulan Ramadhan Di Padang Sumatera Barat

"Balimau" as a cultural heritage of the past is associated with fasting Ramadan. "Balimau" welcomes the month of Ramadan is a tradition for the people of Padang, West Sumatra. "Balimau" / toiletries contain a unique coming value. "Balimau", itself is a shower using water mixed with lime or orange. Aside from being an overflow of excitement, self-cleaning also comes. The purpose of "Balimau" is to purify oneself before entering the month of Ramadan, this form of self-purification by bathing in rivers and lakes, washing with oranges and fragrant potpourri. After "Balimau" then forgive because it will enter the month of Ramadan, evening prayer tarawih and the next day fasting. In addition there is also "Balimau" which is done in the bathroom by applying spices and fragrances to a container filled with water and then shampooing the fragrance. However, the "Balimau" tradition has shifted values from positive to come, not even in accordance with the teachings of the Islamic religion, for example, purifying oneself was polluted with the practice of bathing together without the veil between men and women in public baths. Therefore the Majlis Ulama of West Sumatra issued a fatwa that "Balimau" welcoming the holy month of Ramadan is forbidden in Isla

Penilaian Indeks Kesehatan Terumbu Karang di TWP Selat Bunga Laut, Kabupaten Kepulauan Mentawai

Coral reefs condition in the protected marine area at Selat Bunga has decreased every year.  The health of coral reefs is represented by coral index health. The purpose of this study was to analyze the coral reefs health index based on the condition of live coral cover, resilience level and condition of coral fish. Retrieval of coral reefs data using the Under Photo Transect Method and coral fish data collection using the Under Water Visual Census. The results of research at 9 research stations found that the average cover of live coral ranged from 1.40 - 44.68%, fleshy seaweed ranged from 0.13% - 12.87%, rubble ranged from 1.73 - 39.40%, and average total reef fish biomass ranged from 8.93 - 253.23 kg/ha. Coral reef health index values range between 3-6. Coral reefs health index of 67% of research stations is 3. The coral health index value 3 is indicated by a low percent live coral cover, a high resilience rate, and a low reef fish biomass.Kondisi terumbu karang di Kawasan Konservasi Taman Wisata Perairan (TWP) Selat Bunga Laut  telah mengalami penurunan setiap tahun.  Indeks kesehatan karang adalah nilai yang mengambarkan kesehatan karang antar lokasi penelitian. Tujuan penelitian ini adalah menganalisis indeks kesehatan terumbu karang berdasarkan kondisi tutupan karang hidup,  tingkat resiliensi dan kondisi ikan karang.  Pengambilan data terumbu karang dengan metode Under Photo Transect dan pengambilan data ikan karang mengunakan Under Water Visual Census. Hasil penelitian di 9 stasiun penelitian didapatkan persen rata-rata tutupan karang hidup berkisar  1.40- 44.68 %, fleshy seaweed berkisar  0.13% - 12.87%, pecahan karang berkisar 1.73 –39.40 %, dan rata-rata total biomassa ikan karang berkisar 8.93 – 253.23 kg/ha. Nilai indeks kesehatan terumbu karang berkisar antara 3-6. Sebanyak  67% stasiun penelitian mempunyai indeks kesehatan terumbu karang dengan skala 3. Indeks kesehatan karang skala 3 ditunjukkan  oleh  persen tutupan karang  hidup yang rendah, tingkat resiliensi yang tinggi dan biomassa ikan yang rendah