Gear Classification in Skating Cross-Country Skiing Using Inertial Sensors and Deep Learning.

The aim of this current work is to identify three different gears of cross-country skiing utilizing embedded inertial measurement units and a suitable deep learning model. The cross-country style studied was the skating style during the uphill, which involved three different gears: symmetric gear pushing with poles on both sides (G3) and two asymmetric gears pushing with poles on the right side (G2R) or to the left side (G2L). To monitor the technique, inertial measurement units (IMUs) were affixed to the skis, recording acceleration and Euler angle data during the uphill tests performed by two experienced skiers using the gears under study.

Advanced Detection of Failed LEDs in a Short Circuit for Automotive Lighting Applications.

This paper addresses the issue of LED short-circuit fault detection in signaling and lighting systems in the automotive industry. The conventional diagnostic method commonly implemented in newer vehicles relies on measuring the voltage drop across different LED branches and comparing it with threshold values indicating faults caused by open circuits or LED short circuits. With this algorithm, detecting cases of a few LEDs short-circuited within a branch, particularly a single malfunctioning LED, is particularly challenging.

POC device for rapid oral pH determination based on a smartphone platform.

Salivary pH serves as a valuable and useful diagnostic marker for periodontal disease, as it not only plays a critical role in disease prevention but also in its development. Typically, saliva sampling is collected by draining and spitting it into collection tubes or using swabs. In this study, we have developed a Point-of-Care (POC) device for in situ determination of oral pH without the need for complex instruments, relying solely on a smartphone as the detection device.

Comparing undergraduate research experiences before, during, and after the COVID-19 quarantine: The successful adaptation of the BUILD PODER Summer JumpStart program.

In March 2020, the COVID-19 pandemic forced many in person undergraduate research experiences (UREs) to pivot to remote online training. To investigate how the COVID-19 quarantine disrupted student URE outcomes over time, the current study examines Building Infrastructure Leading to Diversity (BUILD) Promoting Opportunities for Diversity in Education and Research (PODER) URE outcomes across different platforms (in-person, remote, and hybrid models) by comparing student survey data from 2019 to 2021. Participants consisted of three cohorts: 2019 (n = 26 students), 2020 (n = 33), 2021 (n = 34).

Monitoring website marketing among leading e-cigarette brands and vendors in California: content analysis.

Background: Electronic cigarette (e-cigarette) brands and vendors use websites to promote pro-tobacco messages that may increase susceptibility to use e-cigarettes among never users or help sustain continued e-cigarette use among current users. E-cigarette website marketing is lightly regulated, and little is known about promotional strategies used on e-cigarette companies' websites. This study conducted a content analysis of website marketing from leading e-cigarette companies selling products in California.

Capacitive platform for real-time wireless monitoring of liquid wicking in a paper strip.

Understanding the phenomenon of liquid wicking in porous media is crucial for various applications, including the transportation of fluids in soils, the absorption of liquids in textiles and paper, and the development of new and efficient microfluidic paper-based analytical devices (μPADs). Hence, accurate and real-time monitoring of the liquid wicking process is essential to enable precise flow transport and control in microfluidic devices, thus enhancing their performance and usefulness. However, most existing flow monitoring strategies require external instrumentation, are generally bulky and unsuitable for portable systems.

The Impact of the COVID-19 Pandemic on Sense of Belonging and Science Outcomes among Biomedical Science Students: A Longitudinal Study.

To understand how COVID-19 impacted undergraduate research experiences (URE), the current study examined how student outcomes changed over time among biomedical science majors. In addition, this study describes how a Building Infrastructure Leading to Diversity (BUILD) Promoting Opportunities for Diversity in Education and Research (PODER) URE program shifted entirely online in response to COVID-19. Biomedical science majors at a university in Southern California completed surveys in 2019 and 2020 and rated their science identity, science self-efficacy, and academic self-concept.

Histopathological Differences in Adult and Elderly Patients With Chronic Rhinosinusitis.

Background: Adult and elderly patients with chronic rhinosinusitis (CRS) undergo similar therapeutic management. Few studies have undertaken sinonasal tissue-level comparisons of these groups. This study examines histopathological differences between adults (>18, <65 years) and the elderly (≥65 years) with CRS, with the goal of optimizing medical management.

SARS-CoV-2 viral RNA detection using the novel CoVradar device associated with the CoVreader smartphone app.

The COVID-19 pandemic has highlighted the need for innovative approaches to its diagnosis. Here we present CoVradar, a novel and simple colorimetric method that combines nucleic acid analysis with dynamic chemical labeling (DCL) technology and the Spin-Tube device to detect SARS-CoV-2 RNA in saliva samples. The assay includes a fragmentation step to increase the number of RNA templates for analysis, using abasic peptide nucleic acid probes (DGL probes) immobilized to nylon membranes in a specific dot pattern to capture RNA fragments.

Histopathologic differences between adult and pediatric patients with chronic rhinosinusitis.

Background: Adult and pediatric patients with chronic rhinosinusitis (CRS) may have differing philosophies in therapeutic management. Few studies have examined sinonasal tissue-level comparisons of these groups. This study examines histopathologic differences between children and adults with CRS, with the goal of understanding disease pathogenesis and optimizing medical management for both populations.

Digital Optical Ballistocardiographic System for Activity, Heart Rate, and Breath Rate Determination during Sleep.

In this work, we present a ballistocardiographic (BCG) system for the determination of heart and breath rates and activity of a user lying in bed. Our primary goal was to simplify the analog and digital processing usually required in these kinds of systems while retaining high performance. A novel sensing approach is proposed consisting of a white LED facing a digital light detector.

The impact of e-cigarette product place in music videos on susceptibility to use e-cigarettes among young adults: An experimental investigation.

Introduction: Product placement in music videos is a growing promotional strategy. This study examined the impact of e-cigarette product placement and imagery in music videos on susceptibility to use e-cigarettes among young adults.

Methods: A non-probability sample of young adults (18 to 24) in Southern California were recruited to participate in an experiment over Zoom.

Smart facemask for wireless CO monitoring.

The use of facemasks by the general population is recommended worldwide to prevent the spread of SARS-CoV-2. Despite the evidence in favour of facemasks to reduce community transmission, there is also agreement on the potential adverse effects of their prolonged usage, mainly caused by CO rebreathing. Herein we report the development of a sensing platform for gaseous CO real-time determination inside FFP2 facemasks.

Electronic Cigarette Product Placement and Imagery in Popular Music Videos.

Introduction: Given the increasing use of electronic cigarettes (e-cigarettes) among young adults, it is crucial to identify possible sources of e-cigarette marketing exposure in media popular among young adults. However few studies document e-cigarette product placement (eg, visible logo, branded merchandise or gear such as a branded hat or shirt) in music videos. The objective of this study was to determine the extent of e-cigarette product placement and imagery in popular music videos.

Microdroplet based disposable sensor patch for detection of α-amylase in human blood serum.

Concentration of α-amylase in human serum is a key indicator of various pancreatic ailments and an affordable point-of-care detection of this biomarker can benefit millions suffering from these diseases. In view of this situation, we report the development of a flexible patch-sensor, which simply requires a microdroplet of aqueous starch-FeSO solution to detect α-amylase in serum. The detection is achieved through the generation of mixing vortices (~12 rpm) inside the droplet with the help of an imposed thermal gradient.

Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy.

Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry.

Do tobacco industry websites target content to specific demographic groups?

Background: Prior research has not examined whether tobacco brand websites vary content based on audience demographics. This study explored whether marketing content on tobacco brand websites varied by user ethnicity, gender or age group.

Methods: Participants (n = 32) were adult smokers, representing equal numbers of eight demographic groups: user ethnicity (Non-Hispanic White, Hispanic, African American, Asian), gender (women, men) and age (age 21-35, age 36+).

Cannabis Surveillance With Twitter Data: Emerging Topics and Social Bots.

To use publicly accessible data from people who post to Twitter to rapidly capture and describe the public's recent experiences with cannabis. We obtained Twitter posts containing cannabis-related terms from May 1, 2018, to December 31, 2018. We used methods to distinguish between posts from social bots and nonbots.

Optical portable instrument for the determination of CO in indoor environments.

A portable device based on a colorimetric sensor to determine the atmospheric level of CO gas is presented in this work. The system is based on a low-cost, low-power System on a Chip (SoC) microcontroller with integrated Wi-Fi. A user-friendly application was developed to monitor and log the CO measurements when the system is connected to a Wi-Fi network.

Comparison of e-cigarette marketing and availability in tobacco retail outlets among diverse low-income communities in California.

Objective: Research examining marketing and availability of electronic cigarettes (e-cigarettes) within tobacco retail stores is limited, especially among vulnerable communities. However, tobacco retailers tend to be the first point of access to e-cigarette exposure, especially among youth. In response, store observations were conducted among tobacco retailers across five ethnically diverse, low-income communities.

General-purpose passive wireless point-of-care platform based on smartphone.

A versatile, compact and low-cost analytical platform has been designed, tested and validated to be used in the point-of-care settings. This passive measurement system is powered and complemented by a standard smartphone including a programmed application for measurement configuration and data processing as well as wireless results sharing. Electrochemical and electrochemiluminescence analytical techniques can be configured and realized by this platform that employs standard screen-printed electrodes for the sample managing and off-the-shelf electronic components.

A Descriptive Longitudinal Study of Changes in Vape Shop Characteristics and Store Policies in Anticipation of the 2016 FDA Regulations of Tobacco Products, Including E-Cigarettes.

After proposing the "Deeming Rule" in 2014, the U.S. Food and Drug Administration (FDA) began regulating the manufacturing, marketing, and sales of electronic cigarette (e-cigarette) products as tobacco products in 2016.

Monitoring Tobacco Brand Websites to Understand Marketing Strategies Aimed at Tobacco Product Users and Potential Users.

Introduction: Limited information exists about strategies and methods used on brand marketing websites to transmit pro-tobacco messages to tobacco users and potential users. This study compared age verification methods, themes, interactive activities and links to social media across tobacco brand websites.

Methods: This study examined 12 tobacco brand websites representing four tobacco product categories: cigarettes, cigar/cigarillos, smokeless tobacco, and e-cigarettes.

Cultural values associated with substance use among Hispanic emerging adults in Southern California.

Introduction: Hispanic emerging adults are a priority population for substance use prevention, yet few studies have examined whether traditional Hispanic cultural values serve as risk or protective factors for substance use among emerging adults. This study examined the relationship between familism, respeto, fatalism, and substance use among Hispanic emerging adults.

Methods: Participants (ages 18 to 25) completed surveys indicating identification with familism, respeto, and fatalism, past month use of tobacco, marijuana, hard drugs and binge drinking.