Improved prediction of laminar leading edge separation

Research was conducted to provide a definite criterion for the prediction of the bubble burst on airfoils typical of those used for fighter wings. The approach taken was to correlate existing airfoil bubble burst data using various parameters at the laminar separation point. The method due to Weber was modified to provide a continuous analytic solution for the velocity distribution around the airfoil leading edge. Coupling the modified Weber method with the Stratford laminar separation prediction method leads to a universal chart giving the conditions at separation as a function of stagnation location and leading edge radius. Application of the combined method to available two-dimensional airfoil data resulted in an empirical criterion presenting the limiting local velocity gradient at separation as a function of the boundary layer momentum thickness at separation for bubble burst. The correlation leads as well to the qualitative explanation of two types of laminar stall: thin airfoil and leading edge. The validity of the correlation is demonstrated by predicting the lift coefficient and angle of attack for stall on airfoils with leading edge or trailing edge flaps

Two models of constitutionalism and the legitimacy of law : Dicey or Marshall ?

The article was first published in the Oxford University Commonwealth Law Journal.[À l'origine dans / Was originally part of : Fac. Droit - Coll. facultaire - Théories du droit

Measurement of Cement\u27s Particle Size Distribution by the Buoyancy Weighing-bar Method

One of the important characteristics of cement quality is particle size distribution. There are several simple methods to measure the particle size distribution of cement based on the Stokes diameter, like Andreasen pipette method, sedimentation balance method, centrifugal sedimentation method, etc. A major disadvantages of these methods are they are time consuming process and require special skills. Particle size distribution also can be analyzed by using a different principle through microscopy, laser diffraction/scattering methods and Coulter counter method. Even these methods produce highly accurate results within a shorter time, however, the equipments are expensive. In the present study, it has developed a new method to overcome the problem. The method is the buoyancy weighing-bar method. This method is a simple and cost-effective. The principle of the buoyancy weighing-bar method that the density change in a suspension due to particle migration is measured by weighing buoyancy against a weighing– bar hung in the suspension, and the particle size distribution is calculated using the length of the weighing-bar and the time–course change in the the apparent mass of the weighing–bar. This apparatus consists of an analytical balance with a hook for underfloor weighing, and a weighing–bar, which is used to detect the density change in suspension. The result obtained show that the buoyancy weighing–bar method is suitable for measuring the particle size distribution of cement, and the result is comparable to that of determined by settling balance method

Pengaruh Kepemimpinan Transformasional, Kepuasan Kerja, Keadilan Prosedural terhadap Kinerja Karyawan dengan Variabel Mediasi Organizational Citizenship Behavior (Ocb)

The purpose of this study is to find out whether there is influence of transformational leadership, job satisfaction, procedural fairness to employee performance with moderation variable that is Organizational Citizenship Behavior (OCB). Source of data is primer using the questionnaire taken on the object of research of Bank Syariah Batam with the number of samples as much as 150 respondents of Bank Syariah employees. The research used quantitative descriptive analysis and processed data with SPSS 22 that is regression analysis and path analysis. The results show that there is a positive influence of transformational leadership, job satisfaction, procedural justice on employee performance. Transformational leadership, job satisfaction affects OCB, but procedural justice has no effect on OCB. OCB mediates transformational leadership on employee performance, OCB also mediates job satisfaction on employee performance, but OCB does not mediate procedural justic

Legitimasi Politik Pemerintah Desa (Studi Pengunduran Diri Kepala Desa Di Desa Cindai Alus Kecamatan Martapura Kabupaten Banjar)

Fenomena legitimasi politik pemerintah desa sejak tahun 2010 – 2012 di Kabupaten Banjar terdapat di delapan Desa, antara lain Desa Lok Tunggul, Cindai Alus, Rantau Bujur, Haur Kuning, Sungai Jati, Keliling Benteng Ilir, Tambak Sirang Baru, dan Melayu Tengah. Seluruh rangkaian fenomena tersebut salah satu fenomena legitimasi politik yang menarik dan aktual diteliti adalah fenomena legitimasi politik pemerintah desa Cindai Alus, yaitu Kepala Desa, Aparatur Desa, dan BPD. Menariknya, Kepala Desa didesak masyarakat untuk mengundurkan diri dari tahta kekuasaannya dengan cara demonstrasi. Demonstrasi masyarakat memberikan deskripsi nilai kepercayaan masyarakat terhadap pemerintah desa untuk menyelenggarakan pemerintahan. Uraian fenomena tersebut diteliti, analisis, dan interpretasi secara mendalam dengan menggunakan desain penelitian kualitatif pendekatan deskriptif. Pengumpulan data menggunakan observasi, wawancara dan dokumentasi. Data yang terkumpul dianalisis menggunakan analisis data model alir menurut Miles dan Huberman.Hasil penelitian menunjukan bahwa Pemerintah Desa Cindai Alus Masa Jabatan Tahun 2008 – 2014 tidak lagi mendapat legitimasi politik pada Tahun 2010. Legitimasi politik untuk menjalankan authority dan keputusan politik. Delegitimasi politik pemerintah desa tersebut disebabkan oleh faktor kepemimpinan yang kurang responsiveness terhadap tuntutan warga, pemecatan ketua rukun tetangga, kurang mampu berhubungan baik dengan Badan Permusyawaratan Desa, dan tidak profesionalisme dalam menjalankan pemerintah desa. Runtutan penyebab tersebut saling terkait dan mengakibatkan delegitimasi politik terhadap kepala desa Cindai Alus

Sistem Aplikasimonitoring Pembentukan Karakter Personal di Star Model Agency

Sistem  Aplikasi  Monitoring  Pembentukan  Karakter  Personal  di  STAR  Model Agency memberikan  informasi mengenai  data  para  model diSTAR  Model Agency.  Selain  itu  juga  sistem  ini  memberikan  informasi  mengenai monitoring pembentukan karakter personal model dengan metode monitoring. Sistem aplikasi ini berbasis web dan hanya bisa diakses oleh pihak dalam agency saja. Fasilitas yang ada dalam agency ini antara lain, data model, data pengajar, data client, nilai model sebelum treatment, nilai model setelah treatment, statistika penilaian model, dan laporan  data  model  yang  diberikan  ke client.  Tujuan  utama  dari  pembuatan  sistem  aplikasi  ini  adalah  untuk memudahkan  pihak  manajemen agency dalam  memilih  dan  memonitor  model  yang  akan  diberikan  kepada client agar kualitas model yang diberikan sesuai dengan kategori yang diinginkan. Dengan adanya sistem ini, pekerjaan management dalam pemilihan model untuk client bisa lebih akurat dan efisien

A Fiber-Optic Aircraft Lightning Current Measurement Sensor

A fiber-optic current sensor based on the Faraday Effect is developed for aircraft installations. It can measure total lightning current amplitudes and waveforms, including continuing current. Additional benefits include being small, lightweight, non-conducting, safe from electromagnetic interference, and free of hysteresis and saturation. The Faraday Effect causes light polarization to rotate in presence of magnetic field in the direction of light propagation. Measuring the total induced light polarization change yields the total current enclosed. The system operates at 1310nm laser wavelength and can measure approximately 300 A - 300 kA, a 60 dB range. A reflective polarimetric scheme is used, where the light polarization change is measured after a round-trip propagation through the fiber. A two-detector setup measures the two orthogonal polarizations for noise subtraction and improved dynamic range. The current response curve is non-linear and requires a simple spline-fit correction. Effects of high current were achieved in laboratory using combinations of multiple fiber and wire loops. Good result comparisons against reference sensors were achieved up to 300 kA. Accurate measurements on a simulated aircraft fuselage and an internal structure illustrate capabilities that maybe difficult with traditional sensors. Also tested at a commercial lightning test facility from 20 kA to 200 kA, accuracy within 3-10% was achieved even with non-optimum setups