Smale flows on S2×S1\mathbb{S}^2\times\mathbb{S}^1

In this paper, we use abstract Lyapunov graphs as a combinatorial tool to obtain a complete classification of Smale flows on $\mathbb{S}^2\times\mathbb{S}^1$. This classification gives necessary and sufficient conditions that must be satisfied by an abstract Lyapunov graph in order for it to be associated to a Smale flow on $\mathbb{S}^2\times\mathbb{S}^1$

Amyloid excess in Alzheimer’s disease: What is cholesterol to be blamed for?

AbstractA link between alterations in cholesterol homeostasis and Alzheimer’s disease (AD) is nowadays widely accepted. However, the molecular mechanism/s underlying such link remain unclear. Numerous experimental evidences support the view that changes in neuronal membrane cholesterol levels and/or subcellular distribution determine the aberrant accumulation of the amyloid peptide in the disease. Still, this view comes from rather contradictory data supporting the existence of either high or low brain cholesterol content. This is of particular concern considering that therapeutical strategies aimed to reduce cholesterol levels are already being tested in humans. Here, we review the molecular mechanisms proposed and discuss the perspectives they open

Three-dimensional aspects of fluid flows in channels. II. Effects of Meniscus and Thin Film regimes on Viscous Fingers

We perform a three-dimensional study of steady state viscous fingers that develop in linear channels. By means of a three-dimensional Lattice-Boltzmann scheme that mimics the full macroscopic equations of motion of the fluid momentum and order parameter, we study the effect of the thickness of the channel in two cases. First, for total displacement of the fluids in the channel thickness direction, we find that the steady state finger is effectively two-dimensional and that previous two-dimensional results can be recovered by taking into account the effect of a curved meniscus across the channel thickness as a contribution to surface stresses. Secondly, when a thin film develops in the channel thickness direction, the finger narrows with increasing channel aspect ratio in agreement with experimental results. The effect of the thin film renders the problem three-dimensional and results deviate from the two-dimensional prediction.Comment: 9 pages, 10 figure

\u27If I am not well, I can\u27t do sessions well\u27: An analysis of the narratives of Filipino Therapists during the COVID-19 Pandemic

Research is uncovering the repercussions of the COVID-19 pandemic on the mental and emotional state of various populations around the world. It is of particular interest to this study to explore how the pandemic has affected psychologists conducting therapy with clients in distress during this time. A qualitative approach was used to analyse the narratives of eight Filipino psychologists who were living in community quarantine while conducting therapy from March to December 2020. The results revealed four chapters: (1) \u27thrown up in the air\u27, (2) struggling to find their footing, (3) gaining stability and (4) \u27finding new rhythm\u27. It was found that these psychologists suffered the emotional distress from the pandemic that many are experiencing around the world. They needed to first regain stability in their well-being before being able to become effective helpers to their clients again. Moreover, they eventually found new purpose and growth in their practice. This study documented and discussed the journey of therapists in a shared traumatic reality, from first exposure to growth

‘If I Am Not Well, I Can’t Do Sessions Well’: an Analysis of the Narratives of Filipino Therapists During the COVID-19 Pandemic

Research is uncovering the repercussions of the COVID‐19 pandemic on the mental and emotional state of various populations around the world. It is of particular interest to this study to explore how the pandemic has affected psychologists conducting therapy with clients in distress during this time. A qualitative approach was used to analyse the narratives of eight Filipino psychologists who were living in community quarantine while conducting therapy from March to December 2020. The results revealed four chapters: (1) ‘thrown up in the air’, (2) struggling to find their footing, (3) gaining stability and (4) ‘finding new rhythm’. It was found that these psychologists suffered the emotional distress from the pandemic that many are experiencing around the world. They needed to first regain stability in their well‐being before being able to become effective helpers to their clients again. Moreover, they eventually found new purpose and growth in their practice. This study documented and discussed the journey of therapists in a shared traumatic reality, from first exposure to growth

Factors of academic stress: Do they impact English academic performance?

This study investigated the college students’ level of academic performance and determined the impact of academic stress on their English academic performance. This employed a descriptive-exploratory research design with Exploratory Factor Analysis (EFA) and correlation analysis (Pearson r) as main analyses using statistical software. The result suggested that the students (N=250) have a moderate level of stress. Likewise, seven factors were generated through EFA but were reduced to four factors using parallel analysis, the factors are perceived personal stress, classroom stress, performance stress, and time management stress. In the correlation analysis, it was found out that perceived personal stress, classroom stress, and performance stress are significantly correlated except for time management stress. Moreover, these factors were found to have no significant relationship with the English grades of the students. With this result, it is concluded that despite having a moderate level of academic stress, students were able to manage them by using a plethora of coping mechanisms available. The institutions should offer prevention and intervention services that directly address the academic stress of the students to ensure academic success

Moment method boundary conditions for multiphase Lattice Boltzmann simulations with partially-wetted walls

We propose a lattice Boltzmann approach for simulating contact angle phenomena in multiphase fluid systems. Boundary conditions for partially-wetted walls are introduced using the moment method. The algorithm with our boundary conditions allows for a maximum density ratio of 200000 for neutral wetting. The achievable density ratio decreases as the contact angle departs from 90°, but remains of the order O(102) for all but extreme contact angles. In all simulations an excellent agreement between the simulated and nominal contact angles is observe

Evaporation and Electrowetting of Sessile Droplets on Slippery Liquid-like Surfaces and Slippery Liquid-Infused Porous Surfaces (SLIPS)

Sessile droplet evaporation underpins a wide range of applications from inkjet printing to coating. However, drying times can be variable and contact-line pinning often leads to undesirable effects, such as ring stain formation. Here, we show voltage programmable control of contact angles during evaporation on two pinning-free surfaces. We use an electrowetting-on-dielectric approach and Slippery Liquid-Infused Porous (SLIP) and Slippery Omniphobic Covalently Attached Liquid-Like (SOCAL) surfaces to achieve a constant contact angle mode of evaporation. We report evaporation sequences and droplet lifetimes across a broad range of contact angles from 105°–67°. The values of the contact angles during evaporation are consistent with expectations from electrowetting and the Young-Lippman equation. The droplet contact areas reduce linearly in time, and this provides estimates of diffusion coefficients close to the expected literature value. We further find that the total time of evaporation over the broad contact angle range studied is only weakly dependent on the value of the contact angle. We conclude that on these types of slippery surfaces, droplet lifetimes can be predicted and controlled by the droplet’s volume and physical properties (density, diffusion coefficient, and vapor concentration difference to the vapor phase) largely independent of the precise value of contact angle. These results are relevant to applications, such as printing, spraying, coating, and other processes, where controlling droplet evaporation and drying is important

AN ANALYSIS OF PROCUREMENT ACQUISITION LEAD TIME (PALT) AND ACQUISITION LEAD TIME (ALT) IN THE DEPARTMENT OF DEFENSE (DOD)

We evaluate the Department of Defense (DOD) Procurement Acquisition Lead Time (PALT), as it produces a vital role toward the fielding weapon systems to support our warfighters at the speed of relevance. We examine the roles of the contracting processes and associated PALT by gaining knowledge based off previous topic-related research including but not limited to: peer-review articles, theses, governing regulations, and real-life PALT data provided by a Naval Surface Warfare Center. We discuss the impact on actual real-world situations such as political agendas and worldwide events similar to the pandemic, and how it plays a role on PALT today and the influence that may arise as a nation. We studied the acquisition professional’s duties at the higher-level DOD Program Objective Memorandum (POM) and the Planning, Programming, Budgeting, and Execution (PPBE) process. From this analysis, we developed recommendations for acquisition professionals to effectively and efficiently navigate within the constraint of the POM and PPBE five-year cycle.Civilian, Department of the NavyCivilian, Department of the NavyCivilian, Department of the NavyApproved for public release. Distribution is unlimited