Rancang Bangun Sistem Pengenalan Wajah Dengan Metode Principal Component Analysis

Wajah merupakan salah satu ukuran fisiologis yang paling mudah dan sering digunakan untuk membedakan identitas individu yang satu dengan yang lainnya. Proses pengenalan wajah ini menggunakan informasi mentah dari pixel citra yang dihasilkan melalui camera yang kemudian direpresentasikan dalam metode Principal Components Analysis. Adapun cara kerja metode Principal Components Analysis adalah dengan menghitung dari rata-rata flatvector pixel dari gambar-gambar yang sudah disimpan dalam suatu database, dari rata-rata flatvector tersebut akan didapatkan nila eigenface masing-masing gambar dan kemudian akan dicari nilai eigenface terdekat dari gambar citra wajah yang ingin dikenali. Hasil pengujian menunjukkan tingkat keberhasilan pengenalan wajah secara keseluruhan sebesar 82,27% dengan data wajah sebanyak 130 gambar

Comparative Assessment of the Environmental Dynamics of Dissolved Organic Nitrogen (DON) and Dissolved Organic Phosphorus (DOP) from Three Wetlands in Northern Nigeria

This study assessed comparatively the environmental dynamics of dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) in water samples obtained from three locations (Lokoja, Jebba and Hadejia-Nguru) with five sampling sites in Northern Nigeria. These sites include Jebba, Matara-Uku, Lokoja, Baturiya and Nguru. Samples were collected during the dry and wet seasons of the year 2015 and levels of nitrogen and phosphorus determined using the persulphate wet-oxidation method. The average values for DON and DOP obtained ranged from 9.49±1.83 mg/l to 21.8±14.7 mg/l and 1.65±0.38 mg/l to 6.11±0.58 mg/l respectively. The values obtained for DON during the dry and wet seasons were Jebba (14.1±3.92), Matara-Uku (13.7±3.43), Lokoja (21.0±5.04), Baturiya (21.8±14.7), Nguru (7.14±2.40) and Jebba (13.9±1.97), Matara-Uku (11.3±2.62), Lokoja (9.59±1.46), Baturiya (9.49±1.83), Nguru (11.1±1.78) mg/l respectively. The mean values for DOP were Jebba (1.85±0.07), Matara-Uku (2.60±0.55), Lokoja (2.65±0.31), Baturiya (2.52±0.46), Nguru (1.65±0.38) and Jebba (3.70±0.16), Matara-Uku (5.55±0.24), Lokoja (6.11±0.58), Baturiya (4.93±0.90), Nguru (3.65±0.37) mg/l in the dry and wet seasons respectively. The DON concentrations were significantly higher (p<0.05) in the dry season when compared with the wet season while the DOP concentrations were significantly higher (p<0.05) in the wet season when compared with the dry season. This dynamics was attributed to run off from agricultural farm lands, hydrology and the rate of utilization of these nutrients by water plants. High concentrations of DOP and DON supportgood yield of agricultural produce of the farmlands around the wetlands.Keywords: Dissolved organic nitrogen, dissolved organic phosphorus, dissolved organic matter, wetland

Effect of obestatin on morphometry of testes and testosterone secretion in male rats

This study was designed to evaluate the effects of chronic intra peritoneal administration of obestatin on plasma testosterone concentrations and cellular morphometry of the testes in male Sprague Dawly rats. The treatment groups were injected with obestatin (1 nmol/100 μl saline i.p), while the control groups received saline (100 μl i.p) for ten consecutive days. Blood samples were collected at day 1 and 10 during the dose administration and day 5 and 15 after the dose administration. All the samples were collected at 10:00 a.m. Testes were removed after sacrificing the rats on days 5 and 15 after the last injection. Plasma testosterone concentrations were found significantly high (p < 0.05) in the obestatin treated groups when compared with the control groups. Testicular histomorphometry revealed that, obestatin treatment caused a significant increase in the primary spermatocytes (P < 0.0001), secondary spermatocytes and spermatids (P < 0.005) and leydig cells population (p < 0.0001) both after 5 and 15 days. These findings indicated that obestatin can be a stimulator of testicular functions.Key words: Obestatin, male reproduction, testis, rats

Histological study on the effect of transplanted human umbilical cord blood CD34+ stem cells on albino rats subjected to myocardial infarction

Background: Heart failure is a significant burden to health care systems in the world. One of its major causes is myocardial infarction (MI). Recent developments in stem cells may offer ways to manage heart failure by replacing damaged cardiac muscle with healthy tissue. This study aimed at examining the regenerative effect of intravenously transplanted human umbilical cord blood CD34+ stem cell in a rat model of acute MI. Methods: Forty adult female rats were equally randomized into 5 groups. Groups I and II received saline alone or saline followed by isolation buffer respectively to serve as control groups. The other 3 groups were subjected to induction of acute MI using subcutaneous injection of isoprenaline hydrochloride. In groups III and IV, animals were sacrificed after one week and four weeks respectively. One week after induction of MI, animals in group V received intravenous injection of 4 x 106 CD34+ stem cells separated from the human umbilical cord blood of male fetuses, and were sacrificed after 3 weeks from cell injection. At the end of the experiment, heart tissue was processed for both light and electron microscopic histological studies, and for PCR analysis of the male-specific SRY gene. Results: Light microscopic results of group III revealed increased diameter and necrosis of cardiomyocytes, decreased cross-striations, vascular congestion and mononuclear cellular infiltration. Group IV revealed multiple extensive fibrotic areas. Group V revealed smaller fibrotic areas compared to Group IV. Ultrastructural results confirmed findings of the light microscope. PCR analysis revealed that 63% of heart samples were positive for the presence of SRY gene. Conclusion: CD34+ stem cells can transdifferentiate into cardiomyocyte and regenerate the injured heart subjected to MI.Keywords: HUCB, CD34+ stem cells, myocardial infarction, transdifferentiatio

A SUSTAINABLE APPROACH FOR URBAN INTEGRATION OF HAMM M SAM RAH IN THE HISTORIC CITY OF GAZA

Throughout historical ages, Gaza has been viewed amongst the most important cities of Palestine. The historic centre of Gaza is among the most important sites in the city as it bustles with business activities and is the place of major historic sites, and cultural and architectural legacy in the region. The city of Gaza used to have several public baths which were built to meet the hygiene and health needs of the local inhabitants. Furthermore, they played an important social role as gathering places for socio-cultural events, parties and meetings. It is most unfortunate that a large number of these baths have disappeared, apart from the Samarah bath in Al Zaitoun neighbourhood at the heart of the old city. Hence, the preservation of this unique genuine heritage building is of high importance. This paper attempts to establish key scenarios to integrate the hammām into the Old City urban fabric. The study is based on the hypothesis stating that a sustainable approach can be achieved by associating the hammām to its urban context. Thus, the hammām will constitute an important part of a touristic tour including the main urban entities composing the old City: Al-Omari Mosque, Qisaria Market, Pasha Palace and Khan Al-Zait. Three main scenarios will be proposed, analyzed and explored. The study concludes by suggesting an appropriate scenario for the adaptive re-use of the building, in order to preserve the hammam

REKAYASA LAMPU LED CELUP UNTUK PERIKANAN BAGAN APUNG DI PERAIRAN PATEK KABUPATEN ACEH JAYA PROPINSI ACEH

Kegiatan pemanfaatan potensi perikanan tangkap di perairan Aceh Jaya masih banyak tergantung pada teknologi penangkapan ikan masih terbatas. Jenis alat tangkap yang digunakan di Aceh Jaya adalah pukat pantai, pancing, jaring insang, dan bagan. Jenis bagan yang digunakan oleh nelayan patek yaitu bagan apung. Bagan merupakan salah satu perikanan light fishing. Jenis lampu yang digunakan oleh nelayan patek adalah neon yang ditempatkan di permukaan, sedangkan lampu permukaan ini kurang efektif untuk digunakan. Penelitian ini menggunakan lampu LED celup. Tujuan dari penelitian ini adalah mendapatkan konstruksi lampu celup dalam air  dan menentukan efektifitas lampu LED celup. Konstruksi lampu LED celup dirancang sebuah inovasi yaitu lampu dapat diredupkan sehingga ikan-ikan yang sudah mendekat ke cahaya sehingga lebih terfokus ke bagan. Metode penelitian ini adalah deskriptif, rancang bangun alat, percobaan atau experimental fishing. Dengan adanya lampu LED celup bisa membantu nelayan patek dalam menangkap ikan dan mendapatkan hasil yang lebih maksimal. Total hasil tangkapan dengan menggunakan lampu neon sebesar 2343 kg. Sedangkan, total hasil tangkapan dengan lampu LED celup adalah sebesar 3779 kg. Jenis ikan yang tertangkap pada alat tangkap bagan yaitu teri, peperek, tembang, kembung, selar, japuh, dan layur selama 10 trip, 5 trip bulan gelap dan bulan terang. Terlihat bahwa ada perbedaan jumlah dan komposisi hasil tangkapan dengan menggunakan lampu neon dan lampu celup. Dari hasil penelitian didapatkan kesimpulan lampu LED celup lebih efektif untuk digunakan sebagai alat bantu pada perikanan bagan.</p