repeated experiment
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2022 ◽  
Author(s):  
Hanna Elston ◽  
et al.

Expanded methodology and repeated experiment faulting history.<br>


2022 ◽  
Author(s):  
Hanna Elston ◽  
et al.

Expanded methodology and repeated experiment faulting history.<br>


2021 ◽  
pp. 153857442110171
Author(s):  
Hugo T. C. Veger ◽  
Erik H. Pasveer ◽  
Jos J. M. Westenberg ◽  
Jan J. Wever ◽  
Randolph G. Statius van Eps

Background: Four-dimensional flow magnetic resonance imaging (4D flow MRI) can accurately visualize and quantify flow and provide hemodynamic information such as wall shear stress (WSS). This imaging technique can be used to obtain more insight in the hemodynamic changes during cardiac cycle in the true and false lumen of uncomplicated acute Type B Aortic Dissection (TBAD). Gaining more insight of these forces in the false lumen in uncomplicated TBAD during optimal medical treatment, might result in prediction of adverse outcomes. Methods: A porcine aorta dissection model with an artificial dissection was positioned in a validated ex-vivo circulatory system with physiological pulsatile flow. 4D flow MR images with 3 set heartrates (HR; 60 bpm, 80 bpm and 100 bpm) were acquired. False lumen volume per cycle (FLV), mean and peak systolic WSS were determined from 4D flow MRI data. For validation, the experiment was repeated with a second porcine aorta dissection model. Results: During both experiments an increase in FLV (initial experiment: ΔFLV = 2.05 ml, p < 0.001, repeated experiment: ΔFLV = 1.08 ml, p = 0.005) and peak WSS (initial experiment: ΔWSS = 1.2 Pa, p = 0.004, repeated experiment: ΔWSS = 1.79 Pa, p = 0.016) was observed when HR increased from 60 to 80 bpm. Raising the HR from 80 to 100 bpm, no significant increase in FLV ( p = 0.073, p = 0.139) was seen during both experiments. The false lumen mean WSS increased significant during initial (2.71 to 3.85 Pa; p = 0.013) and non-significant during repeated experiment (3.22 to 4.00 Pa; p = 0.320). Conclusion: 4D flow MRI provides insight into hemodynamic dimensions including WSS. Our ex-vivo experiments showed that an increase in HR from 60 to 80 bpm resulted in a significant increase of FLV and WSS of the false lumen. We suggest that strict heart rate control is of major importance to reduce the mean and peak WSS in uncomplicated acute TBAD. Because of the limitations of an ex-vivo study, 4D flow MRI will have to be performed in clinical setting to determine whether this imaging model would be of value to predict the course of uncomplicated TBAD.


2021 ◽  
Vol 769 (2) ◽  
pp. 022076

This article has been retracted by the authors following correspondence with IOP Publishing in which the authors claim the work is unreliable. The author's explanation follows: "The material of the paper is bacteria, it is not be visible to the naked eyes, the material was contaminated by the drugs that out of date and got polluted, and it caused the serious mistake in the figure 2. The result of different strains of DNA by the primer in 3.3 was not match of our material. The figure 2 was the amplification results of different strains of DNA , and the fragment size of different strains were same in the result, but the result should not be same , so the result was wrong. When we continue to the study, we got new result about the figure 2. There was the amplification results of different strains of DNA by primer TXT in repeated experiment , and the result in the published article was wrong, the material was contaminated. We are afraid that other results were also incorrect in this paper." IOP Publishing cannot verify this information as accurate, however in the interest of transparency and reproducibility, IOP Publishing agrees to retract this article. This notice will be updated if more information comes to light. Retraction published: 21 December 2021


2016 ◽  
Vol 34 (4) ◽  
pp. 787-794 ◽  
Author(s):  
T. ABBAS ◽  
M.A. NADEEM ◽  
A. TANVEER ◽  
R. AHMAD

ABSTRACT Use of herbicide mixtures has been advocated as most effective strategy for avoidance and management of herbicide resistant weeds. Effect of twelve selected treatments of four herbicides (clodinafop-propargil, metribuzin, pinoxaden and sulfosulfuron) two-way mixtures at different doses was investigated against fenoxaprop-p-ethyl resistant and susceptible populations of P. minor grown along the wheat plants. In repeated experiment, herbicides mixtures were applied at 3 to 4 leaf stage of P. minor under greenhouse conditions. All the herbicide mixtures were effective to control resistant as well as susceptible P. minor. Mixtures having 75% lethal dose of each mixture component provided best control against P. minor. Mixtures with 50% lethal dose of each herbicide also provided more than 80% control of P. minor. Surviving P. minor plants after exposure to herbicide mixtures showed reduced growth and seed production potential. No mixture combination produced phytotoxic effects on wheat plant up to 75% of lethal dose of each mixture component. Mixtures including clodinafop-propargil + metribuzin, pinoxaden + sulfosulfuron and pinoxaden + metribuzin at 100% dose of each mixture component produced minor phytotoxic effects on wheat plants and caused no reduction in terms of ultimate growth and grain yield. However, mixture of sulfosulfuron + clodinafop-propargil at 100% dose of each component was phytotoxic to wheat and caused significant reduction in term of growth and grain yield. So, farmers can use these mixtures even at 75% of recommended dose of mixture component to control susceptible and resistant P. minor in wheat.


2015 ◽  
Vol 76 (4) ◽  
Author(s):  
Ahsana Aqilah Ahmad ◽  
Cheng Yee Low ◽  
Nurul Muthmainnah ◽  
Ahmed Jaffar

This paper presents the work of investigating the used of Quantum Tunneling Composites (QTC) Pills as a tactile sensor material. The QTC Pills was tested for their resistivity characteristics to determine the sensor sensitivity, time of response and its allowable working range. The experiments were conducted base on the two parameters; the voltage, and the separation gap against the force/ load that exerted onto the QTC Pills. The results show that with a 5 V supply voltage and 0.5 mm separation gap of a side-by-side sensor construction, the usage of the QTC Pills as a tactile sensor can be optimized. Besides that the resistivity values established from the repeated experiment using QTC Pills produce the similar value and result. This makes the material suitable to be used as a tactile sensor material for the robotic hand.


2015 ◽  
Vol 38 (3) ◽  
pp. 523-552 ◽  
Author(s):  
Tatsuya Nakata ◽  
Stuart Webb

The present study examined the effects of part and whole learning on the acquisition of second language (L2, English) vocabulary. In whole learning, the materials to be learned are repeated in one large block, whereas, in part learning, the materials are divided into smaller blocks and repeated. Experiment 1 compared the effects of the following three treatments: 20-item whole learning, four-item part learning, and 10-item part learning. Unlike previous studies, part and whole learning were matched in spacing. In Experiment 2, spacing as well as the part-whole learning distinction were manipulated, and the following three treatments were compared: 20-item whole learning, four-item part learning with short spacing, and four-item part learning with long spacing. Results of the two experiments suggest that, (a) as long as spacing is equivalent, the part-whole distinction has little effect on learning, and (b) spacing has a larger effect on learning than the part-whole distinction.


2014 ◽  
Vol 8 (1) ◽  
pp. 197-201
Author(s):  
Li Yang ◽  
Xianhe Huang

The frequency response of quartz crystal microbalance loaded by single-drop liquid is studied in this paper. Previous studies have shown that the relationship between resonant frequency and properties of liquid by completely immersing one side of the crystal in liquid. In this work, only localized portion of crystal was wetted by liquid droplet. Repeated experiment shows the relationship between liquid property include viscosity and density to resonant frequency. Furthermore, Theoretical formula describing the frequency change of the quartz crystal microbalance with liquid property is proposed. The predicted results showed distinct coincide with experimental results.


2014 ◽  
Vol 989-994 ◽  
pp. 4547-4550 ◽  
Author(s):  
Yan Feng ◽  
Bo Yi

A lot of the wireless sensor network applications call for sensor nodes to be applicable to any environment. RSSI-based measurements implement conveniently and are cost-efficient and power-efficient in practice. This paper compares the distance estimation performances based RSSI in three different environments by experiments and discusses their characteristic in detail. We carry out a large amount of repeated experiment based on RSSI in three kinds of environments over the 2.4GHz wireless channel. Subsequently, we focus on studying and discussing data analyses of RSSI and possible improvements in each environment. Experimental results demonstrate availability and feasibility of RSSI in outdoor and indoor environments.


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