Phyllobates terribilis

Number of Pages: 5Integrative BiologyGeological Science

Dendrobates leucomelas

Number of Pages: 6Integrative BiologyGeological Science

Development and testing of methodology for evaluating the performance of multi-input/multi-output digital control systems

A Controller Performance Evaluation (CPE) methodology for multi-input/multi-output digital control systems was developed and tested on an aeroelastic wind-tunnel model. Modern signal processing methods were used to implement control laws and to acquire time domain data of the whole system (controller and plant) from which appropriate transfer matrices of the control system could be generated. Matrix computational procedures were used to calculate singular values of return-difference matrices at the plant input and output points to evaluate the performance of the control system. The CPE procedures effectively identified potentially destabilizing controllers and confirmed the satisfactory performance of stabilizing ones

Student proficiency profiles through the computing professional skills assessment

© 2019 IEEE. The professional skills are the non-technical learning outcomes put forth by the Accreditation Board for Engineering and Technology (ABET) as part of the larger set of student learning outcomes that are required of all ABET accredited programs. The Computing Professional Skills Assessment (CPSA) is the only tool and method that is able to simultaneously assess all six of the computing professional skills at both undergraduate and graduate levels. This paper presents the results from the first comprehensive investigation of student attainment of the professional skills using the CPSA across a UAE-based computing program\u27s 3rd year, 4th year, and masters level students. The results show that the students overall are weakest in learning outcomes related to the local and global impact of computing, and the ability to recognise when they need to seek additional knowledge. The proficiency results for each year provide useful insights into what and where weaknesses exist. With this information one can devise interventions in a program so as to improve student learning

Performance dan Interface Testing pada Situs Toko Online Tokopedia dan Lazada

Abstrak – Maraknya berbagai aplikasi dengan fitur yang ditawarkan membuat banyak pengembang yang memanfaatkan hal ini dan membantu berbagai pekerjaan menjadi lebih mudah. Salah satunya adalah toko online. Bidang yang berkaitan erat dengan E-Commerce ini sedang ramai-ramainya dibicarakan, karena sebagian besar pengunjungnya adalah pengguna smartphone atau laptop. Namun ketika menggunakan aplikasi ini, tentunya pengunjung harus merasa nyaman saat mengaksesnya. Kenyamanan itu membuat mereka seringkali tidak menyadari terjadinya kesalahan yang tidak kasat mata. Sehingga diperlukan suatu pengujian untuk mengetahui letak kekurangan pada aplikasi tersebut. Para penulis akan menggunakan beberapa tools dimana nantinya akan menunjukkan hasil nyata tentang performansi dan kelayakan tampilan antarmuka dari aplikasi toko online yang akan diuji untuk mengetahui tingkat performansi situs tersebut.Kata Kunci: perfomansi, tampilan antarmuka, e-commerceAbstract – There are so many applications with features that makes programmers helps many jobs to be easier. One of them is online shop. This thing that is related with something called E-Commerce which has already been the headline this decade. It’s because most of their visitors are smartphone and laptop users. But when they use this application, the user needs to fill confortable while accessing the website. That comfort make them didn’t realize any invisible bugs that happen at the moment. So the applications must have a trial to know the weakness in the application. The writers will use some tools that will show the result about the performance and the proper interface from the one to be tested online shop application to know the level of performance of the site. Keywords: performance, interface, e-commerc

Climates of Warm Earth-like Planets. II. Rotational "Goldilocks" Zones for Fractional Habitability and Silicate Weathering

Planetary rotation rate has a significant effect on atmospheric circulation, where the strength of the Coriolis effect in part determines the efficiency of latitudinal heat transport, altering cloud distributions, surface temperatures, and precipitation patterns. In this study, we use the ROCKE-3D dynamic ocean general circulation model to study the effects of slow rotations and increased insolations on the "fractional habitability" and silicate weathering rate of an Earth-like world. Defining the fractional habitability f(sub h) to be the percentage of a planet's surface that falls in the 0 T 100 C temperature regime, we find a moderate increase in f(sub h) with a 10% and 20% increase in insolation and a possible maximum in f(sub h) at sidereal day lengths between 8 and 32 times that of the modern Earth. By tracking precipitation and runoff, we further determine that there is a rotational regime centered on a 4 day period in which the silicate weathering rate is maximized and is particularly strongly peaked at higher overall insolations. Because of weathering's integral role in the long-term carbonatesilicate cycle, we suggest that climate stability may be strongly affected by the anticipated rotational evolution of temperate terrestrial-type worlds and should be considered a major factor in their study. In light of our results, we argue that planetary rotation period is an important factor to consider when determining the habitability of terrestrial worlds

Development and testing of controller performance evaluation methodology for multi-input/multi-output digital control systems

Described here is the development and implementation of on-line, near real time controller performance evaluation (CPE) methods capability. Briefly discussed are the structure of data flow, the signal processing methods used to process the data, and the software developed to generate the transfer functions. This methodology is generic in nature and can be used in any type of multi-input/multi-output (MIMO) digital controller application, including digital flight control systems, digitally controlled spacecraft structures, and actively controlled wind tunnel models. Results of applying the CPE methodology to evaluate (in near real time) MIMO digital flutter suppression systems being tested on the Rockwell Active Flexible Wing (AFW) wind tunnel model are presented to demonstrate the CPE capability

Aeroservoelastic wind-tunnel investigations using the Active Flexible Wing Model: Status and recent accomplishments

The status of the joint NASA/Rockwell Active Flexible Wing Wind-Tunnel Test Program is described. The objectives are to develop and validate the analysis, design, and test methodologies required to apply multifunction active control technology for improving aircraft performance and stability. Major tasks include designing digital multi-input/multi-output flutter-suppression and rolling-maneuver-load alleviation concepts for a flexible full-span wind-tunnel model, obtaining an experimental data base for the basic model and each control concept and providing comparisons between experimental and analytical results to validate the methodologies. The opportunity is provided to improve real-time simulation techniques and to gain practical experience with digital control law implementation procedures