Previous Instruments Research Articles

In situ observations of ions and magnetic field around Phobos: the mass spectrum analyzer (MSA) for the Martian Moons eXploration (MMX) mission

The mass spectrum analyzer (MSA) will perform in situ observations of ions and magnetic fields around Phobos as part of the Martian Moons eXploration (MMX) mission to investigate the origin of the Martian moons and physical processes in the Martian environment. MSA consists of an ion energy mass spectrometer and two magnetometers which will measure velocity distribution functions and mass/charge distributions of low-energy ions and magnetic field vectors, respectively. For the MMX scientific objectives, MSA will observe solar wind ions, those scattered at the Phobos surface, water-related ions generated in the predicted Martian gas torus, secondary ions sputtered from Phobos, and escaping ions from the Martian atmosphere, while monitoring the surrounding magnetic field. MSA will be developed from previous instruments for space plasma missions such as Kaguya, Arase, and BepiColombo/Mio to contribute to the MMX scientific objectives.

Impact of profession and wards on moral distress in a community hospital.

Recently, a singular survey titled "Measure of Moral Distress-Healthcare Professionals," which addresses shortcomings of previous instruments, has been validated. To determine how moral distress affects nurses and physicians differently across the various wards of a community hospital. We distributed a self-administered, validated survey titled "Measure of Moral Distress-Healthcare Professionals" to all nurses and physicians in the medical/surgical ward, telemetry ward, intensive care units, and emergency rooms of a community hospital. A total of 101 surveys were included in the study. The mean Measure of Moral Distress-Healthcare Professionals score for all respondents was 143.0 (standard deviation = 79.8). The mean Measure of Moral Distress-Healthcare Professionals score was 1.75 greater for nurses than for physicians (92.5 vs 161.5, p < .001), and nurses were 2.52 times more likely to consider leaving their position due to moral distress (68% vs 27%). The mean Measure of Moral Distress-Healthcare Professionals score for moral distress was least prevalent in the medical/surgical ward (92.5, SD = 38.2) and highest in the telemetry ward (197.7, SD = 83.6). The intensive care unit ward had a mean Measure of Moral Distress-Healthcare Professionals score mildly greater than the emergency room. No participant identifying information or information connecting a survey response to an individual was collected. This study was approved by the Raritan Bay Medical Center's Institutional Review Board. This study provides insight into the level of moral distress in the community hospital setting. Telemetry nurses experience significantly more than nurses in other wards. Telemetry nurses typically manage patients sicker than medical/surgical wards, however do not have the resources of the critical care units. This scenario presents challenges for telemetry nurses and may explain their elevated moral distress. In community hospitals, telemetry nurses experience a considerably greater amount of moral distress compared to their colleagues in other wards. As measured by the Measure of Moral Distress-Healthcare Professionals questionnaire, moral distress continues to be higher among nurses compared to physicians.

Simple and Unbiased OSA Prescreening: Introduction of a New Morphologic OSA Prediction Score.

PurposeAn early prescreening in suspected obstructive sleep apnea (OSA) patients is desirable to expedite diagnosis and treatment. However, the accuracy and applicability of current prescreening tools is insufficient. We developed and tested an unbiased scoring system based solely on objective variables, which focuses on the diagnosis of severe OSA and exclusion of OSA.Patients and MethodsThe OSA prediction score was developed (n = 150) and validated (n = 50) within German sleep center patients that were recruited as part of the Sleep Apnea Global Interdisciplinary Consortium (SAGIC). Six objective variables that were easy to assess and highly correlated with the apnea–hypopnea index were chosen for the score, including some known OSA risk factors: body-mass index, neck circumference, waist circumference, tongue position, male gender, and age (for women only). To test the predictive ability of the score and identify score thresholds, the receiver-operating characteristics (ROC) and curve were calculated.ResultsA score ≥8 for predicting severe OSA resulted in an area under the ROC curve (ROC-AUC) of 90% (95% confidence interval: 84%, 95%), test accuracy of 82% (75%, 88%), sensitivity of 82% (65%, 93%), specificity of 82% (74%, 88%), and positive likelihood ratio of 4.55 (3.00, 6.90). A score ≤5 for predicting the absence of OSA resulted in a ROC-AUC of 89% (83%, 94%), test accuracy of 80% (73%, 86%), sensitivity of 72% (55%, 85%), specificity of 83% (75%, 89%), and positive likelihood ratio of 4.20 (2.66, 6.61). Performance characteristics were comparable in the small validation sample.ConclusionWe introduced a novel prescreening tool combining easily obtainable objective measures with predictive power and high general applicability. The proposed tool successfully predicted severe OSA (important due to its high risk of cardiovascular disease) and the exclusion of OSA (rarely a feature of previous screening instruments, but important for better differential diagnosis and treatment).

Development and Evaluation of Scales for Measuring Self-Efficacy and Teaching Beliefs of Students Facilitating Peer-Supported Pedagogies

Two scales measuring teaching self-efficacy and beliefs were developed from previous instruments for use with near-peer facilitators assisting with peer-supported pedagogies. Construct and face validity, measurement reliability, and factor structure were determined using a population of near-peer facilitators working in a peer-led team learning chemistry classroom at a large research-intensive postsecondary institution in the Southeast United States. Results suggest that the scales produce valid and reliable data. Teaching self-efficacy and beliefs were found to increase between pre and post administrations with small to medium effect sizes. The scales can provide a means to evaluate peer-supported pedagogies and as discussion points for faculty members training near-peer facilitators.

Bidirectional reflectance capabilities of the NIST Robotic Optical Scattering Instrument.

The National Institute of Standards and Technology (NIST) Robotic Optical Scattering Instrument (ROSI) serves as the national reference instrument for specular and diffuse bidirectional reflectance measurements in the ultraviolet to short-wave infrared wavelength regions. This paper gives a comprehensive overview of the design, operation, and capabilities of ROSI. We describe measurement methods for diffuse and specular reflectance, identify and quantify the elements of the uncertainty budget, and validate the reflectance scale through comparison with NIST's previous reference instrument, the Spectral Tri-function Automated Reference Reflectometer. Examples of the range of ROSI's capabilities, including the limits for low-reflectance measurements and a research application using out-of-plane measurements of bidirectional reflectance for remote sensing reference reflectors, are also covered.

Romanian Short Version of the Burnout Assessment Tool: Psychometric Properties

The Burnout Assessment Tool (BAT) represents a new measure of burnout that addresses the shortcomings of previous instruments. This study investigates the psychometric properties of the Romanian short version of the BAT. The sample consisted of 648 employees that completed the short version of the BAT. Of this sample, 117 employees also completed measures for other well-being indicators, job demands, job resources, personality, and organizational outcomes. According to our findings, there are strong correlations between the four core (exhaustion, emotional impairment, cognitive impairment, and mental distance) and two secondary (psychological distress and psychosomatic complaints) burnout symptoms. The scales presented appropriate reliability indicators. Results also support the convergent, discriminant, and construct validities. The Item Response Theory analysis showed a good coverage of the latent trait and the confirmatory factor analyses revealed appropriate fit indices. Theoretical and practical implications are discussed.

User Behavioral Intention to Use Online Distance Learning (ODL): The Role of Self-Efficacy and Domain Knowledge

&lt;p class="0abstract"&gt;&lt;span lang="EN-US"&gt;The rise of novel coronavirus 2019 has shifted the roles of education industry. Face-to-face have become a distant memory; students and educators are now heavily relying on the digital communication. Application such as Google Meet, Webex, Webinar, Stream Yard, Zoom, and many more have become the new norm among educators and students. However, the sudden dependency on the digital technologies raises a question on the user intention to use this new digital technology. Therefore, the objective of this study is to determine the role of self-efficacy and domain knowledge towards user behavioral intention to use online distance learning. An instrument was developed by adopting to previous instruments and was analyze using Statistical Package for Social Science and SmartPLS for inferential analysis. Findings shows that the exogenous variables are capable to explained between 47.8% to 68.1% of the endogenous variables.&lt;/span&gt;&lt;/p&gt;

Perceptions of ethical dilemmas in Australian paramedicine

Background: Paramedics experience a range of ethical dilemmas in the course of their work. To date, ethical dilemmas by Australian paramedics have not been documented. With the scope of practice becoming increasingly complex, paramedic education may not have evolved to meet holistic professional demands. Aim: To describe the ethical dilemmas experienced by contemporary Australian paramedics. Methods: An online survey, based on a previous instrument, was used to explore a range of ethical dilemmas. Findings: Paramedics face a range of ethical dilemmas in their everyday practice. While several demographic variables were associated with different perceptions, the results of this study highlight that a paramedic's years of experience is most consistently associated with their perception of ethical dilemmas. Conclusion: Australian paramedics experience a range of ethical dilemmas consistent with previous international findings. Years of experience in the profession features heavily and is relied upon more so than education, suggesting that educational approaches to ethics education in paramedicine need to be reconsidered.

Deep learning in knee imaging: a systematic review utilizing a Checklist for Artificial Intelligence in Medical Imaging (CLAIM).

Our purposes were (1) to explore the methodologic quality of the studies on the deep learning in knee imaging with CLAIM criterion and (2) to offer our vision for the development of CLAIM to assure high-quality reports about the application of AI to medical imaging in knee joint. A Checklist for Artificial Intelligence in Medical Imaging systematic review was conducted from January 1, 2015, to June 1, 2020, using PubMed, EMBASE, and Web of Science databases. A total of 36 articles discussing deep learning applications in knee joint imaging were identified, divided by imaging modality, and characterized by imaging task, data source, algorithm type, and outcome metrics. A total of 36 studies were identified and divided into: X-ray (44.44%) and MRI (55.56%). The mean CLAIM score of the 36 studies was 27.94 (standard deviation, 4.26), which was 66.53% of the ideal score of 42.00. The CLAIM items achieved an average good inter-rater agreement (ICC 0.815, 95% CI 0.660-0.902). In total, 32 studies performed internal cross-validation on the data set, while only 4 studies conducted external validation of the data set. The overall scientific quality of deep learning in knee imaging is insufficient; however, deep learning remains a promising technology for diagnostic or predictive purpose. Improvements in study design, validation, and open science need to be made to demonstrate the generalizability of findings and to achieve clinical applications. Widespread application, pre-trained scoring procedure, and modification of CLAIM in response to clinical needs are necessary in the future. • Limited deep learning studies were established in knee imaging with mean score of 27.94, which was 66.53% of the ideal score of 42.00, commonly due to invalidated results, retrospective study design, and absence of a clear definition of the CLAIM items in detail. • A previous trained data extraction instrument allowed reaching moderate inter-rater agreement in the application of the CLAIM, while CLAIM still needs improvement in scoring items and result reporting to become a wide adaptive tool in reviews of deep learning studies.

Perceptions of ethical dilemmas in Australian paramedicine

Background: Paramedics experience a range of ethical dilemmas in the course of their work. To date, ethical dilemmas by Australian paramedics have not been documented. With the scope of practice becoming increasingly complex, paramedic education may not have evolved to meet holistic professional demands. Aim: To describe the ethical dilemmas experienced by contemporary Australian paramedics. Methods: An online survey, based on a previous instrument, was used to explore a range of ethical dilemmas. Findings: Paramedics face a range of ethical dilemmas in their everyday practice. While several demographic variables were associated with different perceptions, the results of this study highlight that a paramedic's years of experience is most consistently associated with their perception of ethical dilemmas. Conclusion: Australian paramedics experience a range of ethical dilemmas consistent with previous international findings. Years of experience in the profession features heavily and is relied upon more so than education, suggesting that educational approaches to ethics education in paramedicine need to be reconsidered.

Directionally dependent Lambertian-equivalent reflectivity (DLER) of the Earth's surface measured by the GOME-2 satellite instruments

Abstract. In this paper we introduce the new concept of directionally dependent Lambertian-equivalent reflectivity (DLER) of the Earth's surface retrieved from satellite observations. This surface DLER describes Lambertian (isotropic) surface reflection which is extended with a dependence on the satellite viewing geometry. We apply this concept to data of the GOME-2 satellite instruments to create a global database of the reflectivity of the Earth's surface, providing surface DLER for 26 wavelength bands between 328 and 772 nm as a function of the satellite viewing angle via a second-degree polynomial parameterisation. The resolution of the database grid is 0.25∘ by 0.25∘, but the real, intrinsic spatial resolution varies over the grid from 1.0∘ by 1.0∘ to 0.5∘ by 0.5∘ down to 0.25∘ by 0.25∘ by applying dynamic gridding techniques. The database is based on more than 10 years (2007–2018) of GOME-2 data from the MetOp-A and MetOp-B satellites. The relation between DLER and bi-directional reflectance distribution function (BRDF) surface reflectance is studied using radiative transfer simulations. For the shorter wavelengths (λ&lt;500 nm), there are significant differences between the two. For instance, at 463 nm the difference can go up to 6 % at 30∘ solar zenith angle. The study also shows that, although DLER and BRDF surface reflectances have different properties, they are comparable for the longer wavelengths (λ&gt;500 nm). Based on this outcome, the GOME-2 surface DLER is compared with MODIS surface BRDF data from MODIS band 1 (centred around 645 nm) using both case studies and global comparisons. The conclusion of this validation is that the GOME-2 DLER compares well to MODIS BRDF data and that it does so much better than the non-directional LER database. The DLER approach for describing surface reflectivity is therefore an important improvement over the standard isotropic (non-directional) LER approaches used in the past. The GOME-2 surface DLER database can be used for the retrieval of atmospheric properties from GOME-2 and from previous satellite instruments like GOME and SCIAMACHY. It will also be used to support retrievals from the future Sentinel-5 UVNS (ultraviolet, visible, near-infrared, and short-wave infrared) satellite instrument.

Differences in Workplace Risk Perception between Foreign-Born and First-Generation Mexican American Construction Workers.

Risk perception is used to quantify risks in the industry and is influenced by different socio-demographic variables. This work aims to determine significant differences in the risk perception between Mexican American migrants and first-generation Mexican American construction workers. This study used a sample of 112 construction workers. A guided questionnaire was applied to collect socio-demographic information. For workplace risk behaviors, we used a 21-item questionnaire adapted from the previous instrument. Each question asked the participant’s perception of the frequency with which they carried out risky activities during routine work activities and the severity of the possible injuries, using a five-level Likert scale. Then, an inferential analysis was carried out using analysis of variance (ANOVA). The main results highlight that time of residence in the United States had a significant influence (p = 0.012) on risk perception in the surveyed construction workers. On the other hand, the age and time they have been working for the organization did not significantly influence risk perception. Finally, risk perception can vary in construction workers according to different variables. It is essential to investigate the factors that influence it, to prevent risky behaviors that can lead to accidents.

Measuring sustainable development knowledge, attitudes, and behaviors: evidence from university students in Mexico

Current trends such as imminent overpopulation and the take-make-waste economic model are largely responsible for the planet’s dire situation. One of the main limitations identified in research on education for sustainable development is the lack of consensus regarding the measurement of sustainable development in both developed and developing countries. In this regard, several Latin American and Caribbean countries have shown their commitment to sustainable development through policies, strategies, or plans related to both education for sustainable development and environmental education. Taking this into account, the present study aimed to develop standardized measures for the levels of sustainable development knowledge, attitudes, and behaviors among university students in northwestern Mexico. Thus, the importance of this study lies in validating previous instruments and determining the degree to which knowledge and positive attitudes explain sustainable development behaviors. Based on the theory of planned behavior, the empirical evidence showed that in northwestern Mexico, university students presented a moderate degree of knowledge and attitudes regarding sustainability but that they scored at the low-moderate level on behavior. The results are consistent with previous studies, with knowledge (β = .296) and attitudes (β = .183) explaining behaviors favorable to sustainable development (R2 = .18, p < .001). It is recommended that universities promote sustainable development by incorporating education on sustainable development into curricular requirements and extracurricular activities and that institutions of higher education become responsible for training future professionals in this area and evaluating the impact of public initiatives in generating sustainable behaviors among students.

Pertinence and development of cibd – clinical interview for bipolar disorder

IntroductionBipolar disorder (BD) is frequently underdiagnosed and due to poor screening, the average time between onset of symptoms and diagnosis is more than 7-years (Mantere et al., 2004). Improper diagnosis has serious consequences in intervention (Ghaemi et al., 2001), and previous assessment instruments are now considered insufficient to detect intervention changes, and to provide a more functional and integrated view of BD.ObjectivesOur study aims to develop a new DSM-5 based Clinical Interview for Bipolar Disorder (CIBD), providing criteria to diagnose BD, but also the individual’s perceptions dealing with BD symptoms. This interview follows the same structure of CIPD (Martins et al., 2015), which has shown acceptability by the participants and experts.MethodsCIBD was developed by a multidisciplinary team considering the DSM-5 criteria for Bipolar Disorders. There was a thorough research regarding assessment and evaluation of BD, and several suggestions from an international task force of specialist working with BD patients were considered, when writing the questions for the interview. A detailed description of CIBD development is presented. The authors of the interview have extended experience in the management and assessment of BD patients, and CIBD is now being assessed by a wider non-related panel, regarding pertinence and clarity.ResultsPreliminary assessment and qualitative feedback from participants that were interviewed is shown, with an overall positive feedback.ConclusionsCIBD assesses both the diagnosis/presence of mood episodes (hypo/mania, and depressive) and symptoms’ psychosocial correlates. CIBD detects subtle changes caused by intervention adding a much needed recovery focused perspective.DisclosureNo significant relationships.

Early Detection of Periodontitis in Public Health Centres in Malang: An Overview

Based on the Basic Health Research (Riskesdas) 2018, the incidence of periodontitis in Indonesia was reported at 74.1%, which makes it one of the most common oral health problems in the country. Overall, 2,759 patients, aged 19–64 years underwent periodontal examinations at the Public Health Centres in Malang between January and September 2019. The present study aimed to determine the description of periodontitis patients at the Public Health Centres, Malang, by conducting an early detection of periodontitis against the risk of the disease. This study used a cross-sectional design and a proportional random sampling technique. In total, 277 respondents visited the Public Health Centres in Malang during the study period. The early detection result is based on the number of questionnaire scores on signs, symptoms, and exposures to risk factors for periodontitis, which are divided into three categories: high, moderate, and low risks. The instrument used in this study is a modification of the previous research instrument by Renatus. The result showed that 58 respondents had moderate (21%), 4 (1.4%) had high, and 215 (77.6%) had low risks of periodontitis. Respondents who had a lower risk of periodontitis were more than the respondents who had high and moderate risks of periodontitis.&#x0D; Keywords: periodontitis, history of gingivitis, heredity (family history), oral hygiene, history of tobacco use

Potassium isotopic composition of various samples using a dual-path collision cell-capable multiple-collector inductively coupled plasma mass spectrometer, Nu instruments Sapphire

Mass-dependent K isotopic fractionations can be used to trace cosmochemical, geological, and biological processes such as evaporation/condensation, core formation, magmatic processes, weathering, and cellular metabolism. However, the application of stable K isotopes has been limited by major isobaric interferences from Ar, common on conventional multi-collector inductively-coupled-plasma mass-spectrometer (MC-ICP-MS), particularly for the low-K samples. Here, we present a set of high-precision K isotopic data acquired on terrestrial rocks, seawater, as well as a lunar meteorite using the recently released Nu Sapphire™ MC-ICP-MS that utilizes a collision cell to minimize Ar based interferences while maintaining remarkably high K sensitivity (≈ 2000 V/ppm). The influence of several parameters on the precision and accuracy of the K isotopic data has been evaluated, including total K concentration, K intensity mismatch between sample and standard, HNO3 molarity mismatch between sample and standard, and the presence of matrix elements. We found that the Nu Sapphire™ can be used to acquire precise and accurate data using as little as 125 ng of K, which represents an improvement by a factor 10 compared to what has been done on previous instruments. We present data for 23 previously analyzed samples; these data are highly consistent with literature values. On the other hand, accurate measurements are conditioned 1) to the close matching of sample and standard K intensities (a 1% mismatch creates a 0.02‰ offset on the 41K/39K ratio), and 2) to the absence of Ca (a Ca/K ratio of 1% creates a 0.069‰ offset on the 41K/39K ratio). In addition, Rb/K, Na/K, Ti/K and Cr/K ratio should also be maintained under 2.5% to avoid isotopic offset.We confirm the existence of significant mass-dependent K isotopic variations in terrestrial samples and that lunar rocks are isotopically heavier than terrestrial rocks. The incomparable sensitivity offered by the Nu Sapphire opens the possibility for high-precision K isotopic measurements across a wide range of samples for diverse applications.

Development and Validity Assessment of a Chronic Obstructive Pulmonary Disease Knowledge Questionnaire in Low- and Middle-Income Countries.

Rationale: The majority of the morbidity and mortality related to chronic obstructive pulmonary disease (COPD) occurs in low- and middle-income countries (LMICs). Despite the increasing burden of COPD, disease-specific knowledge among healthcare workers and patients in LMICs remains limited. COPD knowledge questionnaires (COPD-KQ) are valid and reliable tools to assess COPD knowledge and can be employed in settings with limited health literacy. Objectives: To develop and assess the validity and reliability of a COPD-KQ among individuals with COPD in three LMIC settings. Methods: Twelve questions were generated by an expert team of 16 researchers, physicians, and public health professionals to create an LMIC-specific COPD-KQ. The content was based on previous instruments, clinical guidelines, focus-group discussions, and questionnaire piloting. Participants with COPD completed the questionnaire across three diverse LMIC settings before and 3 months after delivery of a standardized COPD-specific education package by a local community health worker trained to deliver the education to an appropriate standard. We used paired t tests to assess improvement in knowledge after intervention. Results: Questionnaire development initially yielded 52 items. On the basis of community feedback and expertise, items were eliminated and added, yielding a final 12-item questionnaire, with a maximum total score of 12. A total of 196 participants with COPD were included in this study in Nepal (n = 86), Peru (n = 35), and Uganda (n = 75). The mean ± standard deviation baseline score was 8.0 ± 2.5, and 3 months after education, the mean score was 10.2 ± 1.7. The community health worker-led COPD educational intervention improved COPD knowledge among community members by 2.2 points (95% confidence interval, 1.8-2.6 points; t = 10.9; P < 0.001). Internal consistency using Cronbach's α was 0.75. Conclusions: The LMIC COPD-KQ demonstrates face and content validity and acceptable internal consistency through development phases, suggesting a reliable and valid COPD education instrument that can be used to assess educational interventions across LMIC settings. Clinical trial registered with www.clinicaltrials.gov (NCT03365713).

Validation of SAGE III/ISS Solar Water Vapor Data With Correlative Satellite and Balloon‐Borne Measurements

AbstractSince June 2017, the Stratospheric Aerosol and Gas Experiment III instrument on the International Space Station (SAGE III/ISS) has been providing vertical profiles of upper tropospheric to stratospheric water vapor (SWV) retrieved from solar occultation transmission measurements. The goal of this study is to evaluate the publicly released SAGE III/ISS beta version 5.1 WV retrieval through intercomparison with independent satellite‐ and balloon‐based measurements, and to present recommendations for SAGE III/ISS data quality screening criteria. Overall, we find that SAGE III/ISS provides high quality water vapor measurements. Low quality profiles are predominately due to retrieval instabilities in the upper stratosphere that cause step‐like changes in the profile, and aerosol/cloud‐related interferences (below ∼20 km). Above 35 km, the retrieved uncertainty and noise in the data rapidly grow with increasing altitude due to relatively low extinction signal from water vapor. Below the tropopause, retrieved uncertainty increases with decreasing altitude due to enhanced molecular scattering and aerosol extinction. After screening low‐quality data using the procedures described herein, SAGE III/ISS WV is shown to be in good agreement with independent satellite and balloon‐based measurements. From 20 to 40 km, SAGE III/ISS WV v5.1 data exhibit a bias of 0.0 to −0.5 ppmv (∼10%) relative to the independent data, depending on the instrument and altitude. Despite its status as a beta version, the level of SAGE III/ISS WV agreement with independent data is similar to previous SAGE instruments, and therefore the data are suitable for scientific studies of SWV.

Measuring colloid-surface interaction forces in parallel using fluorescence centrifuge force microscopy.

Interactions between colloidal-scale structures govern the physical properties of soft and biological materials, and knowledge of the forces associated with these interactions is critical for understanding and controlling these materials. A common approach to quantify colloidal interactions is to measure the interaction forces between colloids and a fixed surface. The centrifuge force microscope (CFM), a miniaturized microscope inside a centrifuge, is capable of performing hundreds of force measurements in parallel over a wide force range (10-2 to 104 pN), but CFM instruments are not widely used to measure colloid-surface interaction forces. In addition, current CFM instruments rely on brightfield illumination and are not capable of fluorescence microscopy. Here we present a fluorescence CFM (F-CFM) that combines both fluorescence and brightfield microscopy and demonstrate its use for measuring microscale colloidal-surface interaction forces. The F-CFM operates at speeds up to 5000 RPM, 2.5× faster than those previously reported, yielding a 6.25× greater maximum force than previous instruments. A battery-powered GoPro video camera enables real-time viewing of the microscopy video on a mobile device, and frequency analysis of the audio signal correlates centrifuge rotational speed with the video signal. To demonstrate the capability of the F-CFM, we measure the force required to detach hundreds of electrostatically stabilized colloidal microspheres attached to a charged glass surface as a function of ionic strength and compare the resulting force distributions with an approximated DLVO theory. The F-CFM will enable microscale force measurements to be correlated with fluorescence imaging in soft and biological systems.

A Universal Equivalent Currency Hubee

Universal digital equivalent currency is the equivalents of all negotiable instruments, including paper or electronic money, securities, bills, etc. This paper discusses the basic requirements of universal digital equivalent currency, that is, universality and advance; discusses the technical issues that must be solved for equivalent currency, such as the proof of authenticity of the identifier claimed by the subject, the proof of the attribution of currency and the prevention of duplication, the unification of payment currency and settlement currency, The design goal of equivalent currency is to overcome the defects of the previous negotiable instruments, integrate all advantages into one, which can be used in online and offline, universal in payment and settlement, convenient. This paper takes Hubee as an example to illustrate the whole operation process of digital equivalent currency. Only in this mode, an account can define a serial-no for preventing replication; can define the payee’s account to prove the flow of funds; which makes currency not to be afraid of lost and make account book not to be afraid of theft.