This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Humans rely on microbial communities in both natural and applied settings. One such applied setting is wastewater treatment plants, which use microbial communities to remove pollutants. However, the stability of the taxonomic diversity in these settings is not well understood. To close this gap, researchers examined how the microbial community in activated sludge changed over time in a full-scale wastewater treatment plant. For the first 3 years of a 9-year series, the microbial community fluctuated around a stable average. Then a bleaching event, marked in red under the timeline, abruptly pushed the community to an alternative stable state, where the originally dominant Actinobacteriota were disproportionally depleted and replaced with Proteobacteria, but these taxonomic changes led to little change in either the metabolic profile of the community or system performance. In a fine-scale analysis of dynamics, the researchers identified cohorts that dominated at different periods..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

The major focus of 16.13 is on boundary layers, and boundary layer theory subject to various flow assumptions, such as compressibility, turbulence, dimensionality, and heat transfer. Parameters influencing aerodynamic flows and transition and influence of boundary layers on outer potential flow are presented, along with associated stall and drag mechanisms. Numerical solution techniques and exercises are included.

This undergraduate course builds upon the dynamics content of Unified Engineering, a sophomore course taught in the Department of Aeronautics and Astronautics at MIT. Vector kinematics are applied to translation and rotation of rigid bodies. Newtonian and Lagrangian methods are used to formulate and solve equations of motion. Additional numerical methods are presented for solving rigid body dynamics problems. Examples and problems describe applications to aircraft flight dynamics and spacecraft attitude dynamics.

This course aims to connect the principles, concepts, and laws/postulates of classical and statistical thermodynamics to applications that require quantitative knowledge of thermodynamic properties from a macroscopic to a molecular level. It covers their basic postulates of classical thermodynamics and their application to transient open and closed systems, criteria of stability and equilibria, as well as constitutive property models of pure materials and mixtures emphasizing molecular-level effects using the formalism of statistical mechanics. Phase and chemical equilibria of multicomponent systems are covered. Applications are emphasized through extensive problem work relating to practical cases.

The Middle East’s geographical and strategic uniqueness has made every great power in history to seek to advance its interests in the region. Yet, the region constitutes the greatest single reserve of oil in the world, which has made it a regular source of foreign interference in the post-World War II era. In addition to its geographical and strategic uniqueness, the Middle East is the birthplace and spiritual center of the world’s three most important monotheistic religions. Due to its geopolitical importance, any inter- and intra-state conflict in the Middle East has the potential not only for destabilizing the region as a whole or upsetting the regional balance of power but also affecting global stability. After employing the Regional Security Complex Theory (RSCT) in order to define and delimit the region of the Middle East, the chapters of this book address the question of regional order, examine how regionalism and globalism feature in Middle Eastern integration processes, explore regional bids for hegemony, and investigate the approaches and policies of major international actors.

This resource provides access to the Northern California Training Academy's Core for Social Workers Module 7 training materials. To learn more about the Academy, please visit humanservices.ucdavis.edu/academy.

Upon successful completion of this course, students will be able to:

Create lumped parameter models (expressed as ODEs) of simple dynamic systems in the electrical and mechanical energy domains
Make quantitative estimates of model parameters from experimental measurements
Obtain the time-domain response of linear systems to initial conditions and/or common forcing functions (specifically; impulse, step and ramp input) by both analytical and computational methods
Obtain the frequency-domain response of linear systems to sinusoidal inputs
Compensate the transient response of dynamic systems using feedback techniques
Design, implement and test an active control system to achieve a desired performance measure

Mastery of these topics will be assessed via homework, quizzes/exams, and lab assignments.

Feedback control is an important technique that is used in many modern electronic and electromechanical systems. The successful inclusion of this technique improves performance, reliability, and cost effectiveness of many designs. In this series of lectures we introduce the analytical concepts that underlie classical feedback system design. The application of these concepts is illustrated by a variety of experiments and demonstration systems. The diversity of the demonstration systems reinforces the value of the analytic methods.

The purpose of this activity is to demonstrate some of the different parts of an airplane through the construction of a paper airplane. Students will build several different kinds of paper airplanes in order to figure out what makes an airplane fly and what can be changed to influence the flying characteristics of an airplane.

Benjamin Franklin is credited with saying, “Some people are weatherwise, but most are otherwise.” Ol’ Ben understood that weather can have a great effect on our everyday lives, and he knew the importance of having an understanding of what makes the atmosphere work (and not just knowing when it’s safe to fly a kite). In Meteo 3, we will examine all aspects of the weather. You’ll learn the fundamental processes that drive the atmosphere, along with some of the tools we use to measure those processes. You’ll also learn about large-scale weather systems, severe convection, tropical weather, and climate change. As a result, you’ll be a better consumer of weather information and forecasts. So… do you want to be weatherwise?

This seminar is designed to be an experimental and hands-on approach to applied chemistry (as seen in cooking). Cooking may be the oldest and most widespread application of chemistry and recipes may be the oldest practical result of chemical research. We shall do some cooking experiments to illustrate some chemical principles, including extraction, denaturation, and phase changes.

This module describes different ways to address questions about personality stability across the lifespan. Definitions of the major types of personality stability are provided, and evidence concerning the different kinds of stability and change are reviewed. The mechanisms thought to produce personality stability and personality change are identified and explained.

This course is being offered in conjunction with the colloquium The Politics of Reconstructing Iraq, which is sponsored by MIT’s Center for International Studies and Department of Urban Studies and Planning. Fundamentally, the course focuses on contemporary post-conflict countries (or in-conflict countries) and the role of planning and reconstruction in building nations, mitigating conflicts, reshaping the social, spatial, geopolitical, and political life, and determining the country’s future.

18.311 Principles of Continuum Applied Mathematics covers fundamental concepts in continuous applied mathematics, including applications from traffic flow, fluids, elasticity, granular flows, etc. The class also covers continuum limit; conservation laws, quasi-equilibrium; kinematic waves; characteristics, simple waves, shocks; diffusion (linear and nonlinear); numerical solution of wave equations; finite differences, consistency, stability; discrete and fast Fourier transforms; spectral methods; transforms and series (Fourier, Laplace). Additional topics may include sonic booms, Mach cone, caustics, lattices, dispersion, and group velocity.

This course introduces the design of feedback control systems as applied to a variety of air and spacecraft systems. Topics include the properties and advantages of feedback systems, time-domain and frequency-domain performance measures, stability and degree of stability, the Root locus method, Nyquist criterion, frequency-domain design, and state space methods.

Students explore the physical science behind the causes of quicksand and become familiar with relationship between concepts such as total stress, pore pressure, and effective stress. Students also relate these concepts to soil liquefaction—a major concern during earthquakes. Students begin the activity by designing a simple device to test the effects of quicksand on materials of different densities and weights. They prototype a support structure that works to prevent a heavy object from sinking into quicksand. At the end of the activity, students reflect on the engineering design process and consider the steps civil engineers take in designing sturdy buildings and other structures.

This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Underground organisms are critical to supporting plant life above the ground. While the availability of nutrients above and below is likely to affect this lifeline, it’s unclear how. To find out, researchers monitored soil microbes across Chinese National Ecosystem Research Network (CERN) under two conditions with either low or high amounts of nutrient resources. Data showed that the availability of resources affected how the functional traits of organisms in each ecosystem achieved stability. In systems with low resources, stability was achieved mostly by interactions between organisms occupying the same trophic level of their food web. In contrast, systems with high resources achieved stability through microbial interactions across different trophic levels. These multi-trophic interactions ultimately helped ensure the stability of overall plant biomass..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

After conducting an assessment that showed their building’s vulnerability to wind damage, the Nicklaus Children’s Hospital in Miami looked for a way to improve safety for patients and staff.

This course covers the fundamental concepts of structural mechanics with applications to marine, civil, and mechanical structures. Topics include analysis of small deflections of beams, moderately large deflections of beams, columns, cables, and shafts; elastic and plastic buckling of columns, thin walled sections and plates; exact and approximate methods; energy methods; principle of virtual work; introduction to failure analysis of structures. We will include examples from civil, mechanical, offshore, and ship structures such as the collision and grounding of ships.

Upon successful completion of this course, students will be able to:

Create lumped parameter models (expressed as ODEs) of simple dynamic systems in the electrical and mechanical energy domains
Make quantitative estimates of model parameters from experimental measurements
Obtain the time-domain response of linear systems to initial conditions and/or common forcing functions (specifically; impulse, step and ramp input) by both analytical and computational methods
Obtain the frequency-domain response of linear systems to sinusoidal inputs
Compensate the transient response of dynamic systems using feedback techniques
Design, implement and test an active control system to achieve a desired performance measure

Mastery of these topics will be assessed via homework, quizzes/exams, and lab assignments.