bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of trading and purchasing policies in the market of the construction material
Authors: Gercekovich D A , Yu Gorbachevskaya E , Abramov E A , Rybakova E V 
Published: July 2020

Abstract
In the present research, the authors’ attention is concentrated on the methodological fundamentals of surveying the situation on the construction material market using mathematical analysis methods, the model of “Profitability – Risk” in particular. The significance of the paper under consideration is conditioned by a great value share of construction materials in the integrated capital of an investment construction project and by the necessity to make the dependence on imported construction materials lower. The construction material market regulation and its conditioning oriented at its more effective functioning are to affect the construction field favourably. The information received in the process of analysis with regard to a retrospective information is to become a reference basis in managerial decision making. The objectives to be achieved on managerial decisions making depend on the quality of the reference information. A mathematical algorithm for studying a retrospective information on constructive material value is offered in the paper under consideration along with the analysis of other factors. The algorithm has been worked out basing on the portfolio theory concepts. While gestating the offered algorithm practically, construction materials were ranged to form groups, and following that, several types of materials were defined for each group. In the process of the analysis, a number of items were calculated: yearly price changes, expected average price changes and root-square deviations as risk level indicators and an average values ratio in a price movement to the corresponding risks. Besides, some groups of materials were identified as having considerable value fluctuations. The reasons of their fluctuations having been revealed, the most cost-effective and mostly exposed to risk groups of construction materials were indicated as being mostly on demand in the home markets. The offered recommendations are the result of the investigation and are meant for main participants of the construction material market, such as the government, construction material producers and developers engaged in organizing and planning their activities in the sphere of investment-construction project realization.
The importance of the feasibility study of investments in the development of the Russian oil and gas industry
Authors: Dobysheva T V , Gidaspova A M 
Published: July 2020

Abstract
The article considers the issues of determining the cost of construction of oil and gas facilities at the pre-project stage. The great importance of investing in the construction of oil and gas facilities for the industry and the country’s economy as a whole is analyzed. Shortcomings were identified when calculating the cost of construction at the pre-project stage. Ways of improving the accuracy of the calculations the cost of construction of industrial facilities in the development of feasibility study of investments, including a proposed supplement to its existing base of estimated regulatory documents in large-size collectors of the rates of industrial construction. Also, as part of the method of determining the estimated cost based on enlarged collections and a data bank of previously constructed and designed objects, it is proposed to make adjustments to the register of cost-effective project documentation for reuse. The authors are convinced that increasing the accuracy of calculating the cost of construction products will improve the efficiency of investment in industrial construction.
Boundary Layer Transition Measurement Flight Test Based on Infrared Image Technique
Authors: Zhong Hai , Qi Shenjun , Wang Yalong 
Published: July 2020

Abstract
According to the requirements of boundary layer transition detection measurement flight test, the study on the detection technique of infrared thermal image in real flight conditions was carried out. In this paper, the basic principle of infrared measurement technique was introduced firstly. Through the analysis of the main factors, such as emissivity, radiation incidence angle and temperature difference between the measured object and environment, the test means were determined, which includes surface treatment, infrared light path adjustment, solar radiation and internal heating of tested parts. Then the whole flight test method of boundary layer transition measurement was designed, including selecting test object and test instrument, determining test procedure and image processing procedure, and giving transition location criterion. Finally, the validity of this flight test method was demonstrated through testing results, the research of which would be helpful and meaningful in boundary layer transition measurement.
Research on Combination of Multiple Methods for Spacecraft Propellant Consumption Prediction
Authors: Yin Wenjuan , Cao Zhiwei , Lin Zhen 
Published: July 2020

Abstract
In order to further improve the accuracy of propellant gauging during the geosynchronous satellite transfer orbit, combined with the existing propellant gauging method, a time series analysis method for satellite propellant consumption fusion algorithm is proposed. The error characteristics of the prediction data are analyzed according to the principle of different gauging methods. On the basis of this, the variance of each gauging method is estimated by time series analysis and the optimal weighted fusion estimation based on least squares method is given. The practical application shows that the fusion algorithm can make full use of the advantages of different gauging methods and provide a more reasonable estimation of the real-time propellant consumption.
Bearing-only Trajectory Estimation for Ballistic Target Using Sparse Representation
Authors: Wang Pu , Cheng Yun , Yin Qinghong 
Published: July 2020

Abstract
This paper discusses the problem of estimating the trajectory of a ballistic target using bearing measurements from one passive sensor. The major challenge of this problem is the ill-conditioning of the estimation problem due to poor observability of the target motion via bearing measurements. We present an estimator based on the sparse representation algorithm for one sensor scenario. The sparse representation can dramatically reduce the amount of data needed to be estimated. With sparse representation, the trajectory of the ballistic target can be estimated in poor observability conditions. Besides, we introduce some complementary constraints to improve the observability of target motion. Simulation results indicate that the proposed estimator is effective.
Biofabrication of endothelial cell, dermal fibroblast, and multilayered keratinocyte layers for skin tissue engineering
Authors: Barros Natan R , Kim Han-Jun , Gouidie Marcus J , Lee KangJu , Bandaru Praveen , Banton Ethan A , Sarikhani Einollah , Sun Wujin , Zhang Shiming , Cho Hyun-Jong , Hartel Martin C , Ostrovidov Serge , Ahadian Samad , Hussain Saber M , Ashammakhi Nureddin , Dokmeci Mehmet R , Herculano Rondinelli D , Lee Junmin , Khademhosseini Ali 
Published: July 2020

AbstractThe skin serves a substantial number of physiological purposes and is exposed to numerous biological and chemical agents owing to its large surface area and accessibility. Yet, current skin models are limited in emulating the multifaceted functions of skin tissues due to a lack of effort on the optimization of biomaterials and techniques at different skin layers for building skin frameworks. Here, we use biomaterial-based approaches and bioengineered techniques to develop a 3D skin model with layers of endothelial cell networks, dermal fibroblasts, and multilayered keratinocytes. Analysis of mechanical properties of gelatin methacryloyl (GelMA)-based bioinks mixed with different portions of alginate revealed bioprinted endothelium could be better modeled to optimize endothelial cell viability with a mixture of 7.5% GelMA and 2% alginate. Matrix stiffness plays a crucial role in modulating produced levels of Pro-Collagen I alpha-1 and matrix metalloproteinase-1 in human dermal fibroblasts and affecting their viability, proliferation, and spreading. Moreover, seeding human keratinocytes with gelatin-coating multiple times proved to be helpful in reducing culture time to create multiple layers of keratinocytes while maintaining their viability. The ability to fabricate selected biomaterials for each layer of skin tissues has implications in the biofabrication of skin systems for regenerative medicine and disease modeling.
Reduced thermal conductivity of supported and encased monolayer and bilayer MoS2
Authors: Gabourie Alexander J , Suryavanshi Saurabh V , Farimani Amir Barati , Pop Eric 
Published: July 2020

Abstract
Electrical and thermal properties of atomically thin two-dimensional (2D) materials are affected by their environment, e.g. through remote phonon scattering or dielectric screening. However, while it is known that mobility and thermal conductivity (TC) of graphene are reduced on a substrate, these effects are much less explored in 2D semiconductors such as MoS2. Here, we use molecular dynamics to understand TC changes in monolayer (1L) and bilayer (2L) MoS2 by comparing suspended, supported, and encased structures. The TC of monolayer MoS2 is reduced from ∼117 W m−1 K−1 when suspended, to ∼31 W m−1 K−1 when supported by SiO2, at 300 K. Encasing 1L MoS2 in SiO2 further reduces its TC down to ∼22 W m−1 K−1. In contrast, the TC of 2L MoS2 is not as drastically reduced, being >50% higher than 1L both when supported and encased. These effects are due to phonon scattering with remote vibrational modes of the substrate, which are partly screened in 2L MoS2. We also examine the TC of 1L MoS2 across a wide range of temperatures (300 K to 700 K) and defect densities (up to 5 × 1013 cm−2), finding that the substrate reduces the dependence of TC on these factors. Taken together, these are important findings for all applications which will use 2D semiconductors supported or encased by insulators, instead of freely suspended.
Kaposi Sarcoma Rates Among Persons Living With Human Immunodeficiency Virus in the United States: 2008—2016
Authors: Luo Qianlai , Satcher Johnson Anna , Hall H Irene , Cahoon Elizabeth K , Shiels Meredith 
Published: July 2020

Abstract

Background
Recent studies have suggested that Kaposi sarcoma (KS) rates might be increasing in some racial/ethnic groups, age groups, and US regions. We estimated recent US trends in KS incidence among people living with human immunodeficiency virus (HIV; PLWH).

Methods
Incident KS patients aged 20–59 years were obtained from 36 cancer registries and assumed to be living with HIV. The number of PLWH was obtained from national HIV surveillance data from 2008 to 2016. Age-standardized KS rates and annual percent changes (APCs) in rates were estimated by age, sex, race/ethnicity, state, and region.

Results
Between 2008 and 2016, the age-adjusted KS rate among PLWH was 116/100 000. Rates were higher among males, in younger age groups, and among white PLWH. Washington, Maine, and California had the highest KS rates among PLWH. KS rates among PLWH decreased significantly (average APC = −3.2% per year, P &lt; .001) from 136/100 000 to 97/100 000 between 2008 and 2016. There were no statistically significant increases in KS rates in any age, sex, or racial/ethnic group or in any geographic region or state. However, there were nondecreasing trends in some states and in younger age groups, primarily among black PLWH.

Conclusions
KS incidence rates among PLWH have decreased nationally between 2008 and 2016. Though there were no statistically significant increases in KS rates in any demographic or geographic group, nondecreasing/stagnant KS trends in some states and among younger and black PLWH highlight the need for early diagnosis and treatment of HIV infection.
Feasibility, Acceptability, and Preliminary Efficacy of an App-Based Mindfulness-Meditation Program Among Older Adults
Authors: Mahlo Leeann , Windsor Tim D 
Published: July 2020

Abstract

Background and Objectives
Few studies have focused on the utility of mindfulness-meditation for well-being in older adults. The present study investigated the feasibility, acceptability, and preliminary efficacy of an app-based mindfulness-meditation program among older adults.

Research Design and Methods
A community-based sample of 46 participants aged between 63 and 81 (M = 70.85, SD = 4.70) engaged with a 30-day app-based mindfulness-meditation program for 10 min daily on their smartphones. Each meditation session comprised focusing on the breath, mentally scanning the body, monitoring the mind’s activity, and cultivating a nonjudgmental orientation toward experiences. Participants completed questionnaires at baseline, day 10, and day 30.

Results
On average, participants completed 25 sessions and almost 4 h of application use across the 30 days. Results of linear mixed effects models showed significant improvements in positive affect, negative affect, and life satisfaction across the study interval, but no meaningful change in total mindfulness or perceived stress. Furthermore, relative to high levels of smartphone efficacy, low smartphone efficacy was associated with higher perceived stress and negative affect, and less life satisfaction at baseline; and steeper improvements on these outcomes across the study interval. On average, older adults rated the app-based mindfulness-meditation training as interesting, enjoyable, valuable, and useful.

Discussion and Implications
The findings provide preliminary support for the feasibility and acceptability of an app-based mindfulness-meditation program with community-dwelling older adults and demonstrate potential benefits for well-being. Results suggest the value of further research investigating the efficacy of digital mindfulness-meditation interventions for older adults via larger randomized controlled trials.
The Response to Stress Questionnaire for Parents Following Neonatal Brain Injury
Authors: McDonald Kyla P , Connolly Jennifer , Roberts Samantha D , Ford Meghan K , Westmacott Robyn , Dlamini Nomazulu , Tam Emily W Y , Williams Tricia 
Published: July 2020

AbstractObjectiveThe Response to Stress Questionnaire-Brain Injury (RSQ-BI) was adapted utilizing a patient-oriented approach, exploring parental stress, coping, and associated mental health outcomes in parents of children with neonatal brain injury. The contributions of social risk, child adaptive functioning, and brain injury severity were also explored.MethodsUsing a mixed-method design, this study explored adapted stressor items on the RSQ-BI. Parents and clinicians engaged in semistructured interviews to examine key stressors specific to being a parent of a child with neonatal brain injury. The adapted RSQ-BI was piloted in a parent sample (N = 77, child mean age 1 year 7 months) with established questionnaires of social risk, child adaptive functioning, severity of the child’s injury, coping style, and parent mental health. Descriptive statistics and correlations examined parent stress, coping, and their association with parent mental health.ResultsThe final RSQ-BI questionnaire included 15 stressors. Factor analysis showed stressors loaded onto two factors related to (a) daily role stressors and (b) brain injury stressors. Using the RSQ-BI, parents reported brain injury stressors as more stressful than daily role stressors. When faced with these stressors, parents were most likely to engage in acceptance-based coping strategies and demonstrated lower symptoms of parent depression and anxiety.ConclusionsThe RSQ-BI provides a valuable adaptation to understand both stressors and coping specific to being a parent of a child with neonatal brain injury. Relevant interventions that promote similar coping techniques are discussed for future care and research.
A medicalized hotel as a public health resource for the containment of Covid-19: more than a place for quarantining
Authors: Ramírez-Cervantes K L , Romero-Pardo V , Pérez-Tovar C , Martínez-Alés G , Quintana-Diaz M 
Published: July 2020

ABSTRACT

Background
To describe the implementation of a medicalized hotel in the community of Madrid as a public health resource for the containment of coronavirus disease (COVID-19) and to describe the characteristics of population benefitted.

Methods
A descriptive study of the implementation of the Via Castellana Medicalised Hotel (VCMH) was conducted. The average monthly household income, educational level and occupational social class of the subjects admitted were obtained through a survey conducted during their stay.

Results
There was no guidance for launching; however the hotel was coordinated by a tertiary referral hospital and attended the preventive medicine regulations and the decrees of legal regimes and authorization of health services in Madrid. Between 19 March and the 9 May 2020, 399 patients were admitted; 59% (235) were migrant; the main reason for referral (58%) was a lack of house conditions for quarantining, including overcrowding, which when compared with the migrant status a positive correlation was found. Some other reasons for referral were homelessness and eviction. Most of the survey participants had low monthly household income, educational level and social class.

Conclusions
This medicalized hotel provided medical care and offered housing to a subgroup of vulnerable population who could not afford a safe quarantine.
Propensity and quantification of aerosol and droplet creation during phacoemulsification with high-speed shadowgraphy amid COVID-19 pandemic
Authors: Shetty Naren , Kaweri Luci , Khamar Pooja , Balakrishnan Nikhil , Rasheed Abdur , Kabi Prasenjit , Basu Saptarshi , Shetty Rohit , Nuijts Rudy M.M.A. , Sinha Roy Abhijit 
Published: July 2020

Purpose:
To study propensity of aerosol and droplet generation during phacoemulsification using high-speed shadowgraphy and quantify its spread amid COVID-19 pandemic.

Setting:
Aerosol and droplet quantification laboratory.

Design:
Laboratory study.

Methods:
In an experimental set-up, phacoemulsification was performed on enucleated goat eyes and cadaveric human corneoscleral rims mounted on an artificial anterior chamber. Standard settings for sculpt and quadrant removal mode were used on Visalis 100 (Carl Zeiss Meditec AG). Microincision and standard phacoemulsification were performed using titanium straight tips (2.2 mm and 2.8 mm in diameter). The main wound incisions were titrated equal to and larger than the sleeve size. High-speed shadowgraphy technique was used to detect the possible generation of any droplets and aerosols. The visualization and quantification of size of the aerosols and droplets along with calculation of their spread were the main outcome measures.

Results:
In longitudinal phacoemulsification using a peristaltic pump device with a straight tip, no aerosol generation was seen in a closed chamber. In larger wounds, there was a slow leak at the main wound. The atomization of balanced salt solution was observed only when the phacoemulsification tip was completely exposed next to the ocular surface. Under this condition, the nominal size of the droplet was approximately 50 µm, and the maximum calculated spread was 1.3 m.

Conclusions:
There was no visible aerosol generation during microincision or standard phacoemulsification. Phacoemulsification is safe to perform in the COVID-19 era by taking adequate precautions against other modes of transmission.
Exploring Patients' Values and Preferences for Initial Atrial Fibrillation Education
Authors: McCabe Pamela J. , Kumbamu Ashok , Stuart-Mullen Lynette , Hathaway Julie , Lloyd Margaret 
Published: July 2020

Background
People with a new diagnosis of atrial fibrillation (AF) require knowledge to build skills and confidence to engage in decision making for AF treatment and prevention of AF-related complications. Data to guide development of content and approaches that enable acquisition of knowledge to support effective self-management are lacking.

Objective
The aim of this study was to explore patients' values concerning the content of initial AF education, describe how providers delivered education, and identify patients' preferences for approaches to education.

Methods
We used a qualitative inductive approach. Twenty-five participants given a diagnosis of AF within 18 months of enrollment were recruited from midwest US healthcare system clinics. Data were collected using a semistructured interview guide and were analyzed using qualitative content analysis.

Results
Themes emerging were as follows: (1) important to know, (2) recollections of the how and what of education, and (3) preferences for educational resources. Participants highly valued providers' explanations that AF was not immediately life-threatening and did not require limitations to usual activities. This reassurance from providers decreased fear and then enabled participants to learn about AF management. Verbal explanations were the primary approach to delivering education, but participants consistently expressed preferences for receiving written information and videos to supplement verbal explanations.

Conclusions
Addressing emotional and quality of life concerns at the time of AF diagnosis reduced fear and was critical for enabling participants to attend to discussions about treatment and self-management. The value participants placed on written and video resources as an adjunct to verbal explanation suggests that providers should consider educational approaches beyond verbal explanations.
Alcohol consumption increases the incidence of hepatocellular carcinoma in patients with hepatitis B cirrhosis but not in patients with hepatitis C cirrhosis
Authors: Guan Xin , Xing Fei , Li Yan 
Published: July 2020

Background
Liver cirrhosis and hepatocellular carcinoma (HCC) are common diseases in developing countries. HCC is a serious consequence of liver cirrhosis.

Methods
A total of 1095 decompensated hepatic cirrhotic patients admitted to our hospital were enrolled from September 2014 to August 2019. We described the components of cirrhotic etiology. We evaluated the impact of alcohol consumption on the incidence of HCC in patients with hepatitis B cirrhosis and hepatitis C cirrhosis.

Results
Among all cirrhotic patients admitted, the constituent ratios of hepatitis B cirrhosis and alcohol cirrhosis were 31.32% and 30.32%, respectively. The HCC incidence was higher in patients with hepatitis cirrhosis than in those with alcohol cirrhosis (24.2% in hepatitis B, 17.5% in hepatitis C and 3.92% in alcohol, P < 0.05). The HCC incidence in patients with concomitant hepatitis B virus (HBV) and alcohol consumption was higher than that in patients with HBV alone (33.70% vs. 20.72%, P < 0.05).

Conclusion
Hepatitis B and alcohol were major etiologies for cirrhotic patients. Alcohol consumption increased the incidence of HCC in patients with hepatitis B cirrhosis but not in patients with hepatitis C cirrhosis.