Effect of Ground Proximity on Aerodynamic Characteristics of NACA 4412 Airfoil

Ground effect plays a vital role in modulating the flow behavior over any streamlined body. The most widely used wing-in ground effect (WIG) aircrafts and seaplanes utilize this phenomenon in order to enhance the aerodynamic performance during the landing and take-off phases of flight. This paper investigates the aerodynamics of ground effect on a NACA 4412 rectangular wing without end plates. The experiment was conducted in a low-speed wind tunnel at Re=2×105 for the ground clearance of 1 and 0.5 of the chord, measured from the maximum thickness position on the airfoil. The pressure distribution over the chord length was recorded for α=3° and 6° to verify the effect of ground clearance during takeoffs. The results have shown to be in good accordance with the literature, as the coefficient of lift augmented with increase in ground proximity and the induced drag was minimized

Medical Needs and Healthcare Services for the Somali Community in the Twin Cities

Funded by a Communiversity Personnel Grant from the Center for Urban and Regional Affairs (CURA), University of Minnesota

MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA MELALUI PEMBELAJARAN MULTIMEDIA INTERAKTIF DENGAN MODEL DISCOVERY LEARNING

The purpose of this research is to improve students’ mathematics learning outcomes on ball material through interactive multimedia learning with discovery learning models. This research was conducted in class IX-4 of MTs Negeri 2 Boalemo in the 2019/2020 school year with a total of 21 student. This research is a Classroom Action Research conducted with 1 cycle. The instruments used are in the form of teacher activity observation sheets, student activity observation sheets, and learning outcomes tests. The results of observations of teacher activities obtained a minimum category of good or very good with a percentage of 87.5% and the results of observations of student activities obtained a minimum category of good or very good with a percentage of 91%. Meanwhile, for the learning outcomes test, 19 students achieved the Minimum Completeness Criteria (KKM), or about 90.5%, and 2 students did not complete the test, or around 9.5%. The average student's mathematics learning outcomes on the ball material are 89% or meet the indicators of succes

Conceptual design of a hybrid thermal and photovoltaic receiver of an FMDF collector

The optical characteristic of a Fixed Mirror Distributed Focus (FMDF) solar collector is used as a basis for the design of an hybrid thermal and photovoltaic (PV) receiver. The result provides another variation in energy conversion that an FMDF solar collector can conveniently perform

Pengembangan Berpikir Kritis dalam Pembelajaran Pendidikan Kewarganegaraan Menggunakan Project Citizen

Penelitian ini dilatarbelakangi oleh kebutuhan untuk mengembangkan kemampuan berpikir kritis dengan pembelajaran yang lebih inovatif yaitu menggunakan project citizen. Penelitian ini dilaksanakan di Universitas Kristen Satya Wacana Salatiga dengan subjek penelitian mahasiswa. Data diambil melalui studi dokumentasi, angket, tes, observasi, dan wawancara. Pengolahan data dilakukan dengan statistik dan didukung teori-teori tentang berpikir kritis seperti teori mengenai sikap positif untuk berpikir kritis dari John Langrehr (2006), kemampuan berpikir kritis dari CCEI (2004), karakter berpikir kritis dari Moore and Parker (2009) dan teori-teori yang berkaitan dengan project citizen seperti teori mengenai research-oriented learning dan inquiry learning. Penelitian dilakukan dengan metode quasi eksperimen untuk uji beda antara kelas yang menggunakan project citizen dan kelas konvensional. Untuk pengembangan digunakan desain eksperimental dengan menambah pemahaman mengenai berpikir kritis. Hasil penelitian menunjukkan bahwa pengembangan berpikir kritis menggunakan project citizen yang didahului dengan pemahaman tentang berpikir kritis akan lebih maksimal

Sejarah pengaruh pelita terhadap kehidupan masyarakat pedesaan daerah Sulawesi Selatan

Buku ini membahas tentang Sejarah pengaruh pelita terhadap kehidupan masyarakat pedesaan daerah Sulawesi Selatan dan peningkatan struktur ekonomi, kekuatan industri serta kemampuan pertanian

Chemical and biological investigations of Delonix regia (Bojer ex Hook.) Raf.

U radu je opisana izolacija pet sastojaka petroleterske i diklormetanske frakcije metanolnog ekstrakta kore biljke Delonix regia: lupeol (1), epilupeol (2), β-sitosterol (3), stigmasterol (4) i p-metoksibenzaldehid (5). Nadalje, testirano je antimikrobno djelovanje različitih ekstrakata difuzijskom metodom na disku (15 μg mm2). Zone inhibicije za sastojke topljive u petroleteru, tetraklormetanu i diklormetanu bile su 914 mm, 1113 mm, odnosno 920 mm, dok je zona inhibicije standarda kanamicina bila 2025 mm. U biološkom pokusu smrtnosti morskih kozica najveću toksičnost pokazali su spojevi topljivi u tetraklormetanu (LC50 = 0,83 μg mL1), dok je topljivost sastojaka topljivih u petroleteru i diklormetanu bila LC50 14,94, odnosno 3,29 μg mL1, a standarda vinkristin sulfata 0,812 μg mL1. Ovo je prvo izvješće o izolaciji sastojaka, antimikrobnom djelovanju i citotoksičnosti biljke D. regia.In this study five compounds, lupeol (1), epilupeol (2), β-sitosterol (3), stigmasterol (4) and p-methoxybenzaldehyde (5) were isolated from the petroleum ether and dichloromethane fractions of a methanolic extract of the stem bark of Delonix regia. Antimicrobial screening of the different extracts (15 μg mm2) was conducted by disc diffusion method. The zones of inhibition demonstrated by the petroleum ether, carbon tetrachloride and dichloromethane fractions ranged from 914 mm, 1113 mm and 920 mm, respectively, compared to kanamycin standard with the zone of inhibition of 2025 mm. In brine shrimp lethality bioassay, the carbon tetrachloride soluble materials demonstrated the highest toxicity with LC50 of 0.83 μg mL1, while petroleum ether and dichloromethane soluble partitionates of the methanolic extract revealed LC50 of 14.94 and 3.29 μg mL1, respectively, in comparison with standard vincristine sulphate with LC50 of 0.812 μg mL1. This is the first report on compounds separation from D. regia, their antimicrobial activity and cytotoxicity

Hepatoprotective Effect of Camel Milk on Poloxamer 407 Induced Hyperlipidaemic Wistar Rats

AIM: To investigate the effect of oral administration of camel milk on liver enzymes, total proteins and histology of poloxamer 407 induced hyperlipidaemic wistar rats.MATERIAL AND METHODS: Thirty male wistar rats weighing between 150-200 g were randomly assigned into six groups of five each; group I: administered distilled water, group II: induced with P407, group III: induced with P407 and treated with atorvastatin (20 mg/kg) and groups IV, V and VI: induced with P407 and treated with camel milk 250 mg/kg, 500 mg/kg and 1000 mg/kg respectively. After three weeks, blood samples and liver tissues were collected for the determination of alkaline phospatase (ALP), alanine aminotransferase (ALT), aspartate aminotransferase (AST), total protein, albumin, globulin, albumin/globulin ratio and histological studies respectively.RESULTS: All camel milk treated groups showed significant (p < 0.05) decrease in ALT and AST. Camel milk treated groups; 250 mg/kg and 1000mg/kg showed significant (p < 0.05) decrease in total protein, globulin with all camel milk treated groups having significant (p < 0.05) increase in A/G ratio. Histological examination of liver tissues showed that camel milk at a dose of 250 mg/kg had slight adipocytes infiltration.CONCLUSION: The results of our findings highlight the hepatoprotective effect of camel milk in poloxamer 407 induced hyperlipidaemic wistar rats

A case report of signet-ring cell carcinoma of the colon in a 21 year old man

Signet-ring cell carcinoma of the colon is a rare and aggressive form of colonic cancer which is associated with a very poor prognosis. Various studies have shown that the majority of these cases are encountered in late adulthood. We report a case of a 21-year old man who presented with abdominal pain and altered bowel habit. Colonoscopy examination showed a circumferential growth causing a narrowed bowel lumen at the descending colon. Both barium enema and computed tomography findings showed a long segment malignant stricture at the descending colon. Tissue biopsy indicated features of signet-ring cell carcinoma. He underwent segmental resection of the cancerous lesion with end colostomy when he presented to us with an obstructed and advanced malignant stricture of the descending colon

Evaluation of physicochemical characteristics and antimicrobial activities of copper oxide nanoparticles formed by the solution combustion method

In this paper, copper oxide (CuO) nanoparticles (NPs) was prepared by solution combustion technique. We used copper nitrate as an oxidizer and malic acid as a fuel to make three different CuO NPs by using different fuel ratios: low (M1), stoichiometric (M2), and high (M3). The XRD patterns show that the CuO NPs have the monoclinic structure with an average grain size of 17, 20, and 18 nm corresponding to M1, M2, and M3 respectively. The SEM images revealed that the CuO NPs prepared display bush as morphology consisting of a wheat-like structure for M1, rod-like structure for M2, and sheet-like structure for M3 sample. The FTIR spectrum shows that CuO NPs is successfully formed in all of the samples. A bandgap of around 3.26 eV can be seen in the UV-Vis spectrum. Also, the three samples are possessing antibacterial activity and are influenced by the crystalline size, shape, purity, and uniformity of the crystals. Among the three samples with a difference of morphology, the most influencing factor of antibacterial activity being the shape that of other larger-sized particles