Henri Temianka Correspondence; (kaub)

This collection contains material pertaining to the life, career, and activities of Henri Temianka, violin virtuoso, conductor, music teacher, and author. Materials include correspondence, concert programs and flyers, music scores, photographs, and books.https://digitalcommons.chapman.edu/temianka_correspondence/3831/thumbnail.jp

More than Ninety Percent of the Light Energy Emitted by Near-Infrared Laser Therapy Devices Used to Treat Musculoskeletal Disorders Is Absorbed within the First Ten Millimeters of Biological Tissue

There is increasing interest in the application of near-infrared (NIR) laser light for the treatment of various musculoskeletal disorders. The present study thoroughly examined the physical characteristics of laser beams from two different laser therapy devices that are commercially available for the treatment of musculoskeletal disorders. Then, these laser beams were used to measure the penetration depth in various biological tissues from different animal species. The key result of the present study was the finding that for all investigated tissues, most of the initial light energy was lost in the first one to two millimeters, more than 90% of the light energy was absorbed within the first ten millimeters, and there was hardly any light energy left after 15-20 mm of tissue. Furthermore, the investigated laser therapy devices fundamentally differed in several laser beam parameters that can have an influence on how light is transmitted through tissue. Overall, the present study showed that a laser therapy device that is supposed to reach deep layers of tissue for treatments of musculoskeletal disorders should operate with a wavelength between 800 nm and 905 nm, a top-hat beam profile, and it should emit very short pulses with a large peak power

Deleterious effect of suboptimal diet on rest-activity cycle in Anastrepha ludens manifests itself with age.

Activity patterns and sleep-wake cycles are among the physiological processes that change most prominently as animals age, and are often good indicators of healthspan. In this study, we used the video-based high-resolution behavioral monitoring system (BMS) to monitor the daily activity cycle of tephritid fruit flies Anastrepha ludens over their lifetime. Surprisingly, there was no dramatic change in activity profile with respect to age if flies were consistently fed with a nutritionally balanced diet. However, if flies were fed with sugar-only diet, their activity profile decreased in amplitude at old age, suggesting that suboptimal diet affected activity patterns, and its detrimental effect may not manifest itself until the animal ages. Moreover, by simulating different modes of behavior monitoring with a range of resolution and comparing the resulting conclusions, we confirmed the superior performance of video-based monitoring using high-resolution BMS in accurately representing activity patterns in an insect model

Autonomous tracking device based on luggage carrier

Creating intelligent systems that can sense and interact with their environment has been a huge factor behind the work on artificial intelligence and automation. It involves multidisciplinary and complex technology that has proven to be challenging for researchers working in that area. Despite this, great progress has been made in this area of study over recent years and automated systems can be found everywhere in our daily lives from the automobile industry to manufacturing. The aim of this project involves investigating the idea of an autonomous tracking device. This device will be based on an autonomous luggage piece which would make a traveller’s journey a lot easier. It is important to keep in mind that this idea could be implemented on more than just luggage. Other systems this could be implemented on would be shopping trolleys, golf bags or even for film making. In order to achieve autonomy, background research on triangulation was conducted and is presented in this document. The sensors used for distance measurements were modified ultrasonic sensors used in combination with radio and Bluetooth transmitters. The whole project involved the design of two devices, one carried by the person and hence referred to as ‘the personal device’ throughout this document and one tracking robot. The tracking device’s control circuit was placed on a rigid body with two DC motor driven wheels at the front. Power was supplied by using a battery pack and the device’s brain consisted of Arduino microcontrollers. The motor shield purchased to drive these motors failed to work properly and hence the device could not be tested as an autonomous device. It is still shown that the control algorithm implemented can modify the PWM frequency inputs to the motors according to the direction the device needs to travel in. Hence the use of triangulation in combination with feedback control to drive an autonomous device is indeed feasible. Collision avoidance was implemented using Infrared sensors

Oscillatory Microrheology, Creep Compliance and Stress Relaxation of Biological Cells Reveal Strong Correlations as Probed by Atomic Force Microscopy

The mechanical properties of cells are important for many biological processes, including wound healing, cancers, and embryogenesis. Currently, our understanding of cell mechanical properties remains incomplete. Different techniques have been used to probe different aspects of the mechanical properties of cells, among them microplate rheology, optical tweezers, micropipette aspiration, and magnetic twisting cytometry. These techniques have given rise to different theoretical descriptions, reaching from simple Kelvin-Voigt or Maxwell models to fractional such as power law models, and their combinations. Atomic force microscopy (AFM) is a flexible technique that enables global and local probing of adherent cells. Here, using an AFM, we indented single retinal pigmented epithelium cells adhering to the bottom of a culture dish. The indentation was performed at two locations: above the nucleus, and towards the periphery of the cell. We applied creep compliance, stress relaxation, and oscillatory rheological tests to wild type and drug modified cells. Considering known fractional and semi-fractional descriptions, we found the extracted parameters to correlate. Moreover, the Young’s modulus as obtained from the initial indentation strongly correlated with all of the parameters from the applied power-law descriptions. Our study shows that the results from different rheological tests are directly comparable. This can be used in the future, for example, to reduce the number of measurements in planned experiments. Apparently, under these experimental conditions, the cells possess a limited number of degrees of freedom as their rheological properties change

Phase evolution in thermally annealed metallic-UHTC composites

Please click Additional Files below to see the full abstrac

Thought piece on the effectiveness of contemporary project management and its top performing enablers

One of the most important factors for project success is effective contemporary project management. The aim of this article is to provide project manager practitioners with access to the successful contemporary project management enablers using evidence-based research. A systematic scoping literature review using qualitative and quantitative design was performed on the ScienceDirect database using studies and articles, published in English between 2010 and 2019. This search included factors regarding successful contemporary project management and citation tracking. All studies and articles were peer reviewed. Charted data were narratively reported by clustering the results according to the identified success criteria. The review process resulted in one conceptual framework, one literature review, one survey, and one article about research on another topic, which is related to project management success factors. This article shows that to enhance evidence-based practice, it is recommended that in a contemporary project approach, every project establishes a complementary team-related project with gates as checks to ensure transparency, clarity, and comprehension. Its purpose would include the definition, development, and implementation of clear communication strategy and a mentoring and training program to support retention, build loyalty in organizations, and enhance cooperation between the stakeholders and the project team. A limitation of this study includes the consideration of contemporary project management success factors only but not those success factors influencing contemporary project management success. A second limitation is the use of a single database and the exclusion of journal quality

Distribution of magnetic remanence carriers in the human brain

That the human brain contains magnetite is well established;however, its spatial distribution in the brain has remained unknown. We present room temperature, remanent magnetization measurements on 822 specimens from seven dissected whole human brains in order to systematically map concentrations of magnetic remanence carriers. Median saturation remanent magnetizations from the cerebellum were approximately twice as high as those from the cerebral cortex in all seven cases (statistically significantly distinct, p = 0.016). Brain stems were over two times higher in magnetization on average than the cerebral cortex. The ventral (lowermost) horizontal layer of the cerebral cortex was consistently more magnetic than the average cerebral cortex in each of the seven studied cases. Although exceptions existed, the reproducible magnetization patterns lead us to conclude that magnetite is preferentially partitioned in the human brain, specifically in the cerebellum and brain stem