130 real negative results, null findings, and replication failures in Engineering · Negative / Null Result Report. Search the index →
WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.
Lei Wu, Lin Liu, Bin Gao et al. · 2013 · Langmuir
Although graphene oxide (GO) has been used in many applications to improve human life quality, its environmental fate and behavior are still largely unknown. In this work, a novel approach that combines experimental measurements and…
View details →Franco Zunino, Karen Scrivener · 2020 · Cement and Concrete Research
In limestone calcined clay cements (LC3), more hemicarboaluminate and monocarboaluminate is observed, as compared to other blended cements, from the reaction of metakaolin with limestone. In this study, it is shown that the formation of…
View details →Fiona E. Freeman, Daniel J. Kelly · 2017 · Scientific Reports
Alginate is a commonly used bioink in 3D bioprinting. Matrix stiffness is a key determinant of mesenchymal stem cell (MSC) differentiation, suggesting that modulation of alginate bioink mechanical properties represents a promising strategy to spatially regulate MSC fate within bioprinted tissues. In this study, we define a printability window for alginate of differing molecular weight (MW) by systematically varying the ratio of alginate to ionic crosslinker within the bioink. We demonstrate that the MW of such alginate bioinks, as well as the choice of ionic crosslinker, can be tuned to contro
View details →Ahmad El-Kharouf, Thomas J. Mason, Dan J. L. Brett et al. · 2012 · Journal of Power Sources
This paper presents the first part of a complete ex-situ characterisation of a wide range of commercial Gas Diffusion Layers (GDLs) used in low temperature and high temperature Proton Exchange Membrane (PEM) fuel cells. Physical and electrical characteristics of the GDLs are reported. The results show that the substrate structure has a significant effect on the mechanical and electrical properties of the GDL. Moreover, the Micro Porous Layer (MPL) structure determines the roughness of the surface, and affects the permeability and porosity of the GDL. It was found that the substrate treatment w
View details →Ming‐Huwi Horng, Chan‐Pang Kuok, Min-Jun Fu et al. · 2019 · Computational and Mathematical Methods in Medicine
Scoliosis is a common spinal condition where the spine curves to the side and thus deforms the spine. Curvature estimation provides a powerful index to evaluate the deformation severity of scoliosis. In current clinical diagnosis, the standard curvature estimation method for assessing the curvature quantitatively is done by measuring the Cobb angle, which is the angle between two lines, drawn perpendicular to the upper endplate of the uppermost vertebra involved and the lower endplate of the lowest vertebra involved. However, manual measurement of spine curvature requires considerable time and
View details →R. Quentin Grafton, Michael Ward, Hang To et al. · 2011 · Water Resources Research
Household survey data for 10 countries are used to quantify and test the importance of price and nonprice factors on residential water demand and investigate complementarities between household water‐saving behaviors and the average…
View details →Victor Couture, Benjamin Faber, Yizhen Gu et al. · 2021 · American Economic Review Insights
This paper estimates the impact of the first nationwide e-commerce expansion program on rural households. To do so, we combine a randomized control trial with new survey and administrative microdata. In contrast to existing case studies,…
View details →Patel Bhageerath Reddy, Ayman El‐Refaie, Kum‐Kang Huh et al. · 2012 · IEEE Transactions on Energy Conversion
Electric drive systems, which include electric machines and power electronics, are a key enabling technology for advanced vehicle propulsion systems that reduce the petroleum dependence of the ground transportation sector. To have…
View details →T. D. Stanley, Hristos Doucouliagos, Piers Steel · 2018 · Journal of Economic Surveys
Abstract Despite phenomenal technological progress and exponential growth in computing power, economic growth remains comparative sluggish. In this paper, we investigate two core issues: (1) is there really no connection between ICT and…
View details →Mohamed Dawood Shamout, Rabeb Ben-Abdallah, Muhammad Turki Alshurideh et al. · 2022 · Uncertain Supply Chain Management
The arrival of the era of robots and autonomous machines is undisputable. It is anticipated that the future business environment will be characterized by a variety of intelligent systems and autonomous robots. In 2017, the International Federation of Robotics reported that momentum gained by robotic technologies is strong and that the sales volumes of both service and industrial robots is expected to grow. Building on this projection, the present study proposes a set of prerequisites or key determinants for the adoption of autonomous robots in the supply chain and logistics industry: technolog
View details →Alfredo Schiavone Panni, Simone Cerciello, Nicola Maffulli et al. · 2010 · Knee Surgery Sports Traumatology Arthroscopy
PURPOSE: Predisposing factors to objective patellar instability include trochlear dysplasia, patella alta, patellar tilt and elevated tibial tuberosity-femoral groove distance. The shape of the patella is classically not considered a predisposing factor. Anomalies of dynamic and static factors, including excessive patellar height, tibial tubercle lateralisation or trochlear dysplasia, may influence the development of the patella. METHODS: One hundred and five patients (140 knees) with objective patellar instability were retrospectively reviewed to identify a possible association between the ab
View details →Payam Jalili, Ali Ahmadi Azar, Bahram Jalili et al. · 2023 · Results in Physics
This paper studies the effect of thermo-diffusion, electrical field, and nonlinear thermal radiation. Thermal radiant heat transfer has several industrial applications, and the analysis of radiation heat transfer in non-Newtonian fluids…
View details →Caitlin Martin, Thuy M. Pham, Wei Sun · 2010 · European Journal of Cardio-Thoracic Surgery
OBJECTIVE: Currently, percutaneous aortic valve (PAV) replacement devices are being investigated to treat aortic stenosis in patients deemed to be of too high a risk for conventional open-chest surgery. Successful PAV deployment and…
View details →Jialiu Wei, Jianhui Liu, Shuang Liang et al. · 2020 · International Journal of Nanomedicine
Objective: Silica nanoparticles (SiO 2 NPs) have been extensively employed in biomedical field. SiO 2 NPs are primarily designed to enter the circulatory system; however, little information is available on potential adverse effects of SiO…
View details →Hanisom Abdullah, Kun Mediaswanti, Hongwei Wu · 2010 · Energy & Fuels
This study shows the significant differences in the fuel quality and ash properties of biochars produced from the slow pyrolysis of various biomass components (leaf, wood, and bark). The objective is to identify which component is likely…
View details →Michael S. Northrop, Robert F. Sidonio, Sharon Phillips et al. · 2014 · Pediatric Critical Care Medicine
OBJECTIVES: To determine if a comprehensive extracorporeal membrane oxygenation anticoagulation monitoring protocol results in fewer hemorrhagic complications, reduced blood product usage, and increased circuit life. DESIGN: In September…
View details →Jiqiang Li, Zhen‐Kun Yuan, Shiyou Chen et al. · 2019 · Chemistry of Materials
By combining the electron–phonon coupling effect and the static coupling formalism, we calculate, through the first-principles methods, the carrier capture cross sections of the three possible nonradiative recombination center (NRRC)…
View details →Sheng‐Kai Wu, Marc A. Santos, Stuart L. Marcus et al. · 2019 · Scientific Reports
Abstract Glioblastoma multiforme (GBM) continues to have a dismal prognosis and significant efforts are being made to develop more effective treatment methods. Sonodynamic therapy (SDT) is an emerging modality for cancer treatment which combines ultrasound with sonosensitizers to produce a localized cytotoxic effect. It has long been known that ultrasound exposure can cause both thermal and non-thermal bioeffects and it remains an open question to what degree does temperature impact the efficacy of SDT. In order to optimize the ultrasound parameters of SDT, transcranial MRI-guided focused ultr
View details →Jonathan W. Byrnes, Wes McKamie, Christopher J. Swearingen et al. · 2011 · ASAIO Journal
Extracorporeal membrane oxygenation (ECMO) is a lifesaving therapy, which has been used for the support of children with a broad range of diseases. Two pumps of differing mechanisms have been used to generate the extracorporeal flow:…
View details →Ananyananda Dasari, Sakthi Kumar Arul Prakash, László A. Jeni et al. · 2021 · npj Digital Medicine
This work investigates the estimation biases of remote photoplethysmography (rPPG) methods for pulse rate measurement across diverse demographics. Advances in photoplethysmography (PPG) and rPPG methods have enabled the development of contact and noncontact approaches for continuous monitoring and collection of patient health data. The contagious nature of viruses such as COVID-19 warrants noncontact methods for physiological signal estimation. However, these approaches are subject to estimation biases due to variations in environmental conditions and subject demographics. The performance of c
View details →Nathan Hendricks, Jeffrey M. Peterson, Hendricks, Nathan P. et al. · 2012 · AgEcon Search (University of Minnesota, USA)
Irrigation water demand is estimated using field-level panel data from Kansas over 16 years. The cost of pumping varies over time due to changes in energy prices and across space due to differences in the depth to water. Exploiting this…
View details →Hengtao Wang, Hui Chen, Weicheng Xie et al. · 2021 · Advanced Functional Materials
Abstract The design of polymer acceptors plays an essential role in the performance of all‐polymer solar cells. Recently, the strategy of polymerized small molecules has achieved great success, but most polymers are synthesized from the…
View details →Ana Marin, Damien Lacroix · 2015 · Interface Focus
Rapid prototyping techniques have been widely used in tissue engineering to fabricate scaffolds with controlled architecture. Despite the ability of these techniques to fabricate regular structures, the consistency with which these regular…
View details →Yinsong Wang, Yinsong Wang, Yajie Zou et al. · 2017 · PLoS ONE
Roadway elevation data is critical for a variety of transportation analyses. However, it has been challenging to obtain such data and most roadway GIS databases do not have them. This paper intends to address this need by proposing a method to extract roadway elevation data from Google Earth (GE) for transportation applications. A comprehensive accuracy assessment of the GE-extracted elevation data is conducted for the area of conterminous USA. The GE elevation data was compared with the ground truth data from nationwide GPS benchmarks and roadway monuments from six states in the conterminous
View details →Adrian S. Sabau, Adrian Bejan, D.L. Brownell et al. · 2020 · Applied Thermal Engineering
A novel heat exchanger architecture was investigated, in which each fluid pathway transitions through the heat exchanger from tube-flow to shell-flow, or from shell-flow to tube-flow. The heat exchangers (HX) consisted of two plenums…
View details →Jared H Cooper, David L. Johnson, Margaret Phillips · 2014 · The Annals of Occupational Hygiene
PURPOSE: To assess the relative efficacy of three types of controls in reducing respirable silica exposure during artificial stone countertop cutting with a handheld circular saw. APPROACH: A handheld worm drive circular saw equipped with…
View details →Shuva Paul, Zhen Ni, Chaoxu Mu · 2019 · IEEE Transactions on Neural Networks and Learning Systems
Due to the rapidly expanding complexity of the cyber-physical power systems, the probability of a system malfunctioning and failing is increasing. Most of the existing works combining smart grid (SG) security and game theory fail to…
View details →Seong Ki Yoo, Simon L. Cotton, Robert W. Heath et al. · 2017 · IEEE Wireless Communications Letters
In this letter, we report the results of a series of experiments which were performed to examine the impact of terminal handling and movement upon the user equipment (UE) to evolved NodeB (eNB) communications channel at 60 GHz. Three key utilization scenarios, in which a user imitated making a voice call, sending a text message or simply carrying the device in a pocket, are investigated. Each of these three user cases were studied under line of sight (LOS) and non-LOS (NLOS) channel conditions when the user was mobile in a range of different indoor and outdoor small cell scenarios. It is shown
View details →John Keane, Wei Zhang, Chris H. Kim · 2011 · IEEE Journal of Solid-State Circuits
Variations in the number and characteristics of charges or traps contributing to transistor degradation lead to a distribution of device “ages” at any given time. This issue is well understood in the study of time dependent dielectric…
View details →Yexin Gu, Wenting Zhang, Qiaoling Sun et al. · 2015 · Journal of Materials Chemistry B
Osteocytes reside as 3-dimensionally networked cells in the lacunocanalicular structure of bones, and function as the master regulators of homeostatic bone remodeling. We report here, for the first time to our best knowledge, the use of a…
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