Real non-degenerate two-step nilpotent Lie algebras of dimension eight

We classify the non-degenerate two-step nilpotent Lie algebras of dimension 8 over the field R of real numbers, using results of Galitski and Timashev over complex numbers. We write explicit structure constants for these real Lie algebras.Comment: 21 pages; comments are welcome

Gambaran kesiapsiagaan siswa SMA Lokon St. Nikolaus Tomohon terhadap bencana erupsi gunung berapi

Volcanic eruptions can cause health problems. To prepare for a volcanic eruption disaster, knowledge, attitudes, and actions are needed which are important components of preparedness.  This study aims to describe the preparedness of Lokon St. Nikolaus Tomohon highschool students on the eruption of Mount Lokon. This research is descriptive in nature with a cross-sectional research design which was carried out in October-December 2022. This study used a simple random sampling method and obtained 173 respondents who met the inclusion and exclusion criteria. The instrument used was a student preparedness questionnaire for volcanic eruptions. The level of preparedness of Lokon St. Nikolaus Tomohon in the good category totaling 152 students (87.9%), based on age characteristics in the good category there are 19 years old with a total of 2 students (100%), based on gender characteristics in the good category there is female gender totaling 90 students (90.9 %), and based on the characteristics of the region of origin in the good category, there are other regions with a total of 55 students (90.2%). Keywords: preparedness, volcanic eruption &nbsp

The global scale and implications of delivering multiple interventions through integrated child health events.

INTRODUCTION: Delivering child health services through integrated child health events (ICHEs) has been a useful and popular strategy implemented in many in low-income and middle-income countries (LMICs) to accelerate the reduction of child mortality. The study aims to portray the scope of ICHEs and examine the association between the number of child health-nutrition interventions and types of ICHE packages delivered through these campaigns with vitamin A supplementation (VAS) and measles vaccination. METHODS: Secondary data analysis was conducted using Unicef global campaign database (1999-2010), where 597 ICHEs from 76 countries were analysed. Panel random effects regression models were used to explore the association between the number of interventions and coverage for VAS and measles vaccination, and non-parametric Kruskal-Wallis test to explore the association between different intervention packages and VAS coverage. RESULTS: An average of 100 ICHEs were conducted per year between 2005 and 2010, highest in sub-Saharan Africa (60%). By 2010, 40 ICHEs out of 66 (60%) across 24 countries delivered 5 or more interventions during 1 ICHE. No statistically significant effect of the number of ICHE interventions on VAS coverage was found (-0·76, p=0·185). There was a small significant effect on measles coverage (-1·81, p=0·057), which was not robust to model specifications removing outlier observations with measles coverage lower than 40%. The Kruskal-Wallis test did not suggest a significant association between different intervention packages and VAS coverage at 5% significance level (p=0·07). CONCLUSION: ICHEs were found to be a widely used strategy to deliver essential child health-nutrition interventions in LMICs. ICHEs appear to represent a commonly used platform with the capacity to incorporate multiple interventions without compromising coverage of some key interventions as VAS and measles vaccination. More research is required to better understand what operational factors may affect the coverage outcomes delivered together through ICHEs

The Federal Reserve\u27s Commercial Paper Funding Facility

FRBNY Economic Policy Review, May 2011, pp. 25-3

Perbandingan Metode Pemekatan Kuderna Danish dan Rotary Evaporator dalam Penentuan Total Petroleum Hydrocarbon(TPH) Secara Kromatografi Gas

Total Petroleum Hydrocarbon (TPH) adalah istilah yang digunakan untuk menggambarkan keluarga besar senyawa kimia yang berasal dari minyak mentah. Metode pemekatan awal yang digunakan untuk analisis TPH adalah Kuderna Danish evaporator, yang kemudian mengalami modifikasi sehingga pemekatan dapat pula dilakukan dengan rotary evaporator. Metode percobaan pada penetapan TPH secara kromatografi gas terdiri dari preparasi, pengujian, dan pengolahan data. Parameter verifikasi yang diuji antara lain linearitas, presisi, dan akurasi. Uji beda nyata pada konsentrasi 100 dan 500 mg/L menghasilkan nilai F hitung sebesar 3.6493 dan 1.8586 dengan nilai T hitung sebesar 4.4734 dan 1.9376. Nilai T hitung pada konsentrasi 100 mg/L lebih besar dari T tabel yaitu 2.18 sehingga pada konsentrasi tersebut kedua metode menunjukkan perbedaan nyata, namun nilai F hitung dan T hitung yang diperoleh pada konsentrasi 500 mg/L lebih kecil dari nilai F tabel dan T tabel, yaitu 5.820 dan 2.18 yang menunjukkan bahwa kedua metode tidak berbeda nyata pada selang kepercayaan 95 %. Kata kunci :  dokosana, kromatografi gas, kuderna danish evaporator, rotary evaporator, total petroleum hydrocarbo

Targeting of De Novo DNA Methylation Throughout the Oct-4 Gene Regulatory Region in Differentiating Embryonic Stem Cells

Differentiation of embryonic stem (ES) cells is accompanied by silencing of the Oct-4 gene and de novo DNA methylation of its regulatory region. Previous studies have focused on the requirements for promoter region methylation. We therefore undertook to analyse the progression of DNA methylation of the ∼2000 base pair regulatory region of Oct-4 in ES cells that are wildtype or deficient for key proteins. We find that de novo methylation is initially seeded at two discrete sites, the proximal enhancer and distal promoter, spreading later to neighboring regions, including the remainder of the promoter. De novo methyltransferases Dnmt3a and Dnmt3b cooperate in the initial targeted stage of de novo methylation. Efficient completion of the pattern requires Dnmt3a and Dnmt1, but not Dnmt3b. Methylation of the Oct-4 promoter depends on the histone H3 lysine 9 methyltransferase G9a, as shown previously, but CpG methylation throughout most of the regulatory region accumulates even in the absence of G9a. Analysis of the Oct-4 regulatory domain as a whole has allowed us to detect targeted de novo methylation and to refine our understanding the roles of key protein components in this process

Using genetic algorithms to optimize airfoils in incompressible regime

Aerodynamic optimization is a very actual problem in aircraft design and airfoils are basic two-dimensional shape forming cross sections of wings. Traditionally, the airfoil geometry if defined by a very large number of coordinates. Nowadays, in order to simplify the optimization, the airfoil geometry is approximated by a parametrization, which enables to reduce the number of needed parameters to as few as possible, while effectively controlling the major aerodynamic features. The present work has been done on the Class-Shape function Transformation method (CST) [1, 2]. Also, the paper introduces the concept of Genetic Algorithm (GA) to optimize a NACA airfoil for specific conditions. A Matlab program has been developed to implement CS into the Global Optimization Toolkit. The pressure distribution lift and drag coefficients of the airfoil geometries have been calculated using two programs. The first one is an in-house code based on the Hess-Smith [3] panel technique and on the boundary layer integral equations, while the second is an XFOIL program. The optimized airfoil has improved aerodynamic characteristics as compared to the original one. The optimized airfoil is validated using the Ansys-Fluent commercial code

Estimation of Wind Tunnel Corrections Using Potential Models

The evaluation of the tunnel correction remains an actual problem, especially for the effect of tunnel walls. Even if the experimental campaign meets the basic similitude criteria (Mach, Reynolds etc.), the wall effect on the measured data is always present. Consequently, the flow correction due the limited by walls must be evaluated. Solid wall corrections refer to the aerodynamic interference between the experimental model and the walls of the wind tunnel. This interaction affects the measured forces and implicitly the angle of attack. Usually, these effects are introduced through semi-empirical correction factors which change the global measured forces. The present paper refers to the mathematical and numerical modeling of aerodynamic interferences between the experimental model and the solid walls based on the potential flow model. The main goal is to asses a method allowing an estimate of the corrections for each configuration with a minimum computational resource