Investigating viscous damping using a webcam

We describe an experiment involving a mass oscillating in a viscous fluid and analyze viscous damping of harmonic motion. The mechanical oscillator is tracked using a simple webcam and an image processing algorithm records the position of the geometrical center as a function of time. Interesting information can be extracted from the displacement-time graphs, in particular for the underdamped case. For example, we use these oscillations to determine the viscosity of the fluid. Our mean value of 1.08 \pm 0.07 mPa s for distilled water is in good agreement with the accepted value at 20\circC. This experiment has been successfully employed in the freshman lab setting.Comment: 13 pages, 5 figure

Framework Based Analysis of Corporate Leadership, Emotional Intelligence (EI) Competencies and Organizational Performance – A Developmental Perspective

The study focuses on the issues of organizational performance, particularly related to developing corporate leadership to the level of effectiveness and the extended result as an outcome on organizational performance. We propose a model by plausibly linking the competencies related to emotional intelligence with effectiveness of corporate leadership, eventually fashioning out a high performance organization. In order to develop a framework, it includes conceptions grounded on EI as exogenous variable (ξ), Effective corporate leadership (ECL) as endogenous (η) variable and high performance organisation as outcome variable. The feedback composed was collected from 1171 corporate leaders serving in large business organizations across Pakistan. For analysis purpose, after data cleansing, SEM is employed to obtain results related to model fit and testing of hypotheses. Measurement and Structural Models approve the propositions of the study. After analysis, it is pertinent to mention that findings show great role of the competencies of EI with corporate leadership, and as a trickled down effect on overall organizational performance. The results also show how leadership can be developed to the level of effectiveness and thus can lead to achieve corporate reputation, employee commitment, market performance and financial performance of an organization. It is seen that the influence of EI competencies has not only the impact on the effectiveness of corporate leadership but also on overall organisational performance. &nbsp

PELUANG DAN TANTANGAN BANK SYARIAH DI ERA DIGITAL

Perkembangan bank syariah cukup pesat diera digital seperti sekarang ini sehingga menjadi peluang dan tantangan yang dihadapi oleh bank syariah agar bisa bertahan dan bersaing dengan lembaga keuangan lainnya yang bergerak dilembaga perbankan baik itu jasa atau produk yang menawarkan berbagai macam segala kebutuhan yang memudahkan aktivitas manusia dalam melakukan transaksi. Metode yang digunakan adalah penelitian kualitatif deskriptif berupaya menganalisis jenis tantangan bank syariah dan peluang bank syariah di era digital. Dengan demikian, lembaga keuangan syariah dapat memberikan kemudahan bagi nasabahnya untuk melakukan kegiatan transaksi dengan menggunakan aplikasi yang telah disediakan oleh bank syariah supaya memberikan kenyamanan dan kemudahan bagi seluruh nasabah yang menggunakan jasa perbankan syariah. Peluang dan tantangan bank syariah diera digital yakni memanfaatkan kecanggihan teknologi yang ada serta menciptakan produk inovatif yang dibutuhkan oleh masyarakat agar bisa memberi manfaat yang seluas-luasnya. Bank syariah hadir memberikan solusi dalam memberikan kemudahan pelayanan untuk kebutuhan masyarakat

Detection of Electromagnetic Inclusions using Topological Sensitivity

In this article a topological sensitivity framework for far field detection of a diametrically small electromagnetic inclusion is established. The cases of single and multiple measurements of the electric far field scattering amplitude at a fixed frequency are taken into account. The performance of the algorithm is analyzed theoretically in terms of its resolution and sensitivity for locating an inclusion. The stability of the framework with respect to measurement and medium noises is discussed. Moreover, the quantitative results for signal-to-noise ratio are presented. A few numerical results are presented to illustrate the detection capabilities of the proposed framework with single and multiple measurements.Comment: 31 pages, 5 figure

Cost-Effective and Energy-Efficient Techniques for Underwater Acoustic Communication Modems

Finally, the modem developed has been tested experimentally in laboratory (aquatic environment) showing that can communicates at different data rates (100..1200 bps) compared to state-of-the-art research modems. The software used include LabVIEW, MATLAB, Simulink, and Multisim (to test the electronic circuit built) has been employed.Underwater wireless sensor networks (UWSNs) are widely used in many applications related to ecosystem monitoring, and many more fields. Due to the absorption of electromagnetic waves in water and line-of-sight communication of optical waves, acoustic waves are the most suitable medium of communication in underwater environments. Underwater acoustic modem (UAM) is responsible for the transmission and reception of acoustic signals in an aquatic channel. Commercial modems may communicate at longer distances with reliability, but they are expensive and less power efficient. Research modems are designed by using a digital-signal-processor (DSP is expensive) and field-programmable-gate-array (FPGA is high power consuming device). In addition to, the use of a microcontroller is also a common practice (which is less expensive) but provides limited computational power. Hence, there is a need for a cost-effective and energy-efficient UAM to be used in budget limited applications. In this thesis different objectives are proposed. First, to identify the limitations of state-of-the-art commercial and research UAMs through a comprehensive survey. The second contribution has been the design of a low-cost acoustic modem for short-range underwater communications by using a single board computer (Raspberry-Pi), and a microcontroller (Atmega328P). The modulator, demodulator and amplifiers are designed with discrete components to reduce the overall cost. The third contribution is to design a web based underwater acoustic communication testbed along with a simulation platform (with underwater channel and sound propagation models), for testing modems. The fourth contribution is to integrate in a single module two important modules present in UAMs: the PSK modulator and the power amplifier