scholarly journals Experimental study results of the strip foundation fragment action underpinned by a drill-injection pile with widening low end

2021 ◽  
Vol 1928 (1) ◽  
pp. 012019
Author(s):  
M A Samokhvalov ◽  
A A Paronko ◽  
A A Matyukov
Keyword(s):  
Experimental Study ◽  
Strip Foundation ◽  
Study Results

scholarly journals Numerical and Experimental Study of Lightning Stroke to BIPV Modules

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 748
Author(s):  
Xiaoyan Bian ◽  
Yao Zhang ◽  
Qibin Zhou ◽  
Ting Cao ◽  
Bengang Wei
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Coupling Model ◽  
Maximum Temperature ◽  
Lightning Stroke ◽  
Study Results ◽  
Pv Modules ◽  
New Type ◽  
Metal Frame ◽  
Current Flows

Building Integrated Photovoltaic (BIPV) modules are a new type of photovoltaic (PV) modules that are widely used in distributed PV stations on the roof of buildings for power generation. Due to the high installation location, BIPV modules suffer from lightning hazard greatly. In order to evaluate the risk of lightning stroke and consequent damage to BIPV modules, the studies on the lightning attachment characteristics and the lightning energy withstand capability are conducted, respectively, based on numerical and experimental methods in this paper. In the study of lightning attachment characteristics, the numerical simulation results show that it is easier for the charges to concentrate on the upper edge of the BIPV metal frame. Therefore, the electric field strength at the upper edge is enhanced to emit upward leaders and attract the lightning downward leaders. The conclusion is verified through the long-gap discharge experiment in a high voltage lab. From the experimental study of multi-discharge in the lab, it is found that the lightning interception efficiency of the BIPV module is improved by 114% compared with the traditional PV modules. In the study of lightning energy withstand capability, a thermoelectric coupling model is established. With this model, the potential, current and temperature can be calculated in the multi-physical field numerical simulation. The results show that the maximum temperature of the metal frame increases by 16.07 °C when 100 kA lightning current flows through it and does not bring any damage to the PV modules. The numerical results have a good consistency with the experimental study results obtained from the 100 kA impulse current experiment in the lab.

Effect of reverse thermoelastic phase transformation on stress of onset of structural deformation in titanium nickelide

2021 ◽  
pp. 2-10
Author(s):  
A. A. Movchan ◽  
◽  
S. A. Kazarina ◽  
A. L. Silchenko ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Phase Transformation ◽  
Inelastic Deformation ◽  
Titanium Nickelide ◽  
Structural Deformation ◽  
Isotropic Hardening ◽  
Reverse Phase ◽  
Maximum Value ◽  
Study Results ◽  
Thermoelastic Phase Transformation

The experimental study results of the dependence in the stress value of the onset of the structural deformation on the degree of the reverse phase transformation occurring after the complete direct martensitic transformation in titanium nickelide are described. It is established that these results are qualitatively and quantitatively correctly described in the framework of the model according to which the maximum value of the intensity of the intrinsic inelastic deformation of the martensitic part of the representative volume of the shape-memory alloy is used as a parameter of isotropic hardening.

scholarly journals Supporting awareness of content-related controversies in a wiki-based learning environment

2017 ◽  
Author(s):  
Sven Heimbuch ◽  
Daniel Bodemer
Keyword(s):  
Experimental Study ◽  
Learning Environment ◽  
Knowledge Construction ◽  
Learning Processes ◽  
User Generated Content ◽  
External Representations ◽  
Study Results ◽  
Discussion Threads ◽  
Contradictory Evidence ◽  
Awareness Support

User generated content in wikis is mainly distributed on the article view and its corresponding talk page. Potentials of analyzing and supporting discussants' knowledge construction processes on the level of talk pages have still been rarely researched. The presented experimental study addresses this issue by providing external representations of content-related controversies which were led by contradictory evidence between discussants to foster awareness on socio-cognitive conflicts which can be beneficial for learning. Its aim is to investigate how increased salience of controversies can guide participants' (N = 81) navigation and learning processes. Three conditions differing in their degree of awareness support were implemented in this study. Results indicate that the implementation of awareness representations helped students to focus on meaningful discussion threads. Findings suggest that wiki talk page users can benefit from additional structuring aids.

An Experimental Study on the Mechanical Properties of Cemented Rock-Tailings Fill

2014 ◽  
Vol 941-944 ◽  
pp. 2611-2619
Author(s):  
Li Jie Guo ◽  
Ke Ping Zhou ◽  
Xiao Cong Yang ◽  
Guang Sheng Liu ◽  
Wen Yuan Xu
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Mine Waste ◽  
Waste Rock ◽  
Mill Tailings ◽  
Mix Proportion ◽  
Study Results ◽  
Mine Waste Rock ◽  
Materials Used ◽  
Mine Development

This paper outlines an effective approach to making composite backfill using mine waste material. Composite materials are widely used in many areas of engineering because of their unique structural properties. Cemented rock-tailings are one of the most prevalent materials used for composite backfill because they can effectively make use of mine waste rock and mill tailings that would otherwise be simply considered waste. This backfill method has the capability of maintaining the mine environment while still allowing for continued mine development. An experimental study is being conducted in a cooperative mine research project to investigate the properties of backfill material and specifically the mechanical characteristics of cemented waste rock-tailings fill. This study details the characteristics of the composite backfill aggregate with respect to the compressive strength of the cemented rock-tailings fill and the backfill mix-proportion, as well as outlines a new method of study for cemented rock-tailings fill mechanics. The study results show the compressive strength of cemented rock-tailings fill is dependent mainly on the cement and waste rock content. Ensuring a precise backfill mix proportion can effectively reduce the cement dosage, thereby decreasing the backfill cost realized for the mine.

Study of dynamics of value systems of youth’s leaders under pedagogical conditions of value-motivational development

2020 ◽  
pp. 23-27
Author(s):  
A.A. Oschepkov ◽  
◽  
V.V. Friauf
Keyword(s):  
Experimental Study ◽  
Leadership Development ◽  
Social Interaction ◽  
Theoretical Analysis ◽  
Value Systems ◽  
Study Results ◽  
Values Development ◽  
High Level ◽  
Group Interests

Presented is study in the problem of leadership in youth environment, in frames of which theoretical analysis of scientific works was conducted. The analysis showed, that the most actual in the present time is the value approach to leadership development for verification of which is experimental study is conducted. Results of the experiment showed dynamics of changes in values systems of both girls and boys during the period of conducting psycho-pedagogical program of values development. The analysis of experimental study results showed, that values orientations system of girls with high level of leader’s ability is oriented to social interaction, and values orientations system of boys with high level of leader’s ability is oriented to inner-group interests.

scholarly journals THE EFFECTIVENESS OF SOCIAL ADS TARGETING DRUNK DRIVING

2021 ◽  
Author(s):  
Dainora Šakinytė ◽  
◽  
Rasa Markšaitytė ◽  
Laura Šeibokaitė ◽  
Auksė Endriulaitienė ◽  
...  
Keyword(s):  
Experimental Study ◽  
Road Safety ◽  
Drunk Driving ◽  
Control Group ◽  
Attitude Questionnaire ◽  
Risky Driving ◽  
Study Results ◽  
Car Wash ◽  
Threat Appeals ◽  
Social Marketing Campaigns

"Social advertisements with threat appeals are widely used to reduce drunk driving. However, research on the effectiveness of such advertising is limited. This study aimed to evaluate, what emotions cause threat appeal ads targeting drunk driving and whether these ads change risky driving attitudes. 41 students (17.1 percent males; mean age 20.9 years; 53.7 percent had a driving license) voluntarily participated in the experimental study. Every participant was randomly assigned to one of three groups: two experimental (watched one of two TV ads with threat appeals) or control group (watched car wash ad with no threatening stimuli). After watching one of three ads, all participants were asked to evaluate seven emotions and to fill in Driving Attitude Questionnaire (DAQ). Results revealed that both road safety threat appeal ads targeting drunk driving did not arouse any stronger fear emotions or differences in driving attitudes compared to control group. Both experimental groups didn’t differ in emotions or attitudes as well. No difference in emotions and attitudes was found when comparing the reaction of participants who have seen the specific ad before the experiment and those who haven’t. The fact of being a licensed driver was also not related to the level of reported emotions or attitude differences in both experimental groups. The study results reveal that the possible effectiveness of threat appeal ads from ongoing social marketing campaigns on reducing drunk driving is questionable and further studies are needed."

scholarly journals Extraction of Fe (III) and Zn (II) by ionic liquids in a system based on polypropylene glycol 425 and sodium chloride.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 72-75
Author(s):  
I. V. Zinov’eva ◽  
◽  
M. I. Fedorova ◽  
Yu. A. Zakhodyaeva ◽  
A.A. Voshkin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Ionic Liquids ◽  
Sodium Chloride ◽  
Phase System ◽  
Polypropylene Glycol ◽  
Two Phase ◽  
Study Results ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Extraction Of Metals

This work presents the experimental study results of Fe(III) and Zn(II) extraction by ionic liquids based on trioctylmethylammonium chloride and rhodanide in an aqueous two-phase system based on polypropylene glycol 425 and sodium chloride. Based on the results obtained, it was concluded that these extractants are effective for the extraction of metals from aqueous solutions, and aqueous two-phase systems represent a “green” alternative to traditional extraction systems.

scholarly journals Treatment of Benign Bone and Joint Tumors and TumorLike Diseases Using Alloplasty and Collagen Containing Material (Clinical and Experimental Study)

2017 ◽  
pp. 37-46
Author(s):  
V. I. Zorya ◽  
A. A. Krasil’Nikov ◽  
I. G. Chemyanov ◽  
A. G. Matveev
Keyword(s):  
Experimental Study ◽  
Surgical Treatment ◽  
Bone Defect ◽  
Bone Structure ◽  
Study Group ◽  
Combined Method ◽  
Treatment Results ◽  
Pathologic Process ◽  
Study Results

Purpose. Improvement of surgical treatment results in patients with benign bone and joint tumors and tumor-like diseases.Materials and methods.Evaluation of the efficacy of plastic collagen containing material for bone defect plasty was performed in 58 Chinchilla rabbits (3-4 kg). In animals from study group the bone defect was filled with collost. Histological examination of the samples was performed in 14, 30, 60 and 90 days after operation. During the period from 2007 to 2015 ninety eight patients, aged 14-75 years, with benign bone and joint tumors and tumor-like diseases were operated on. In all cases postresection defect (1-50 см_) plasty was performed by the proposed combined method that included the use of frozen allograft and collost. During subsequent follow up the potentiality of pathologic process relapse was determined as well as the dynamics of bone structure restoration, extremity function and bone anatomic shape were assessed.Results.Pathomorphologic picture of experimental samples showed that collast accelerated the bone regenerate maturity in the place of a defect. In 1 year after surgery 74 patients (75%) showed good results - in 8 (11.2%), satisfactory - in 62 (84.1%), poor - in 3 (4.7%) cases and in 3 years after operation (57 patients) - 28 (49.1%), 28 (49.1%) and 1 (1.7%) case respectively. Examination of 56 patients (57.1%) in 5 years after intervention revealed good results in 48 (85.4%) and poor - in 8 (14.6%) cases.Conclusion.Study results allow recommending the proposed method of plasty using the allograft and collost for the substitution of vast postresection defects in patients with benign bone and joint tumors and tumor-like diseases.

scholarly journals Design of systems for integrated processing of dairy raw materials in the cheese industry

2021 ◽  
Vol 3 (11 (111)) ◽  
pp. 80-87
Author(s):  
Mykola Yatskov ◽  
Natalia Korchyk ◽  
Volodymyr Besediuk
Keyword(s):  
Experimental Study ◽  
Buffer Capacity ◽  
Cheese Whey ◽  
Production Systems ◽  
Raw Materials ◽  
Redox Conditions ◽  
Raw Material ◽  
Optimal Conditions ◽  
Study Results ◽  
Integrated Processing

For the functioning of integrated systems for processing dairy raw materials in the cheesemaking industry, it is proposed to consider the basic concepts of synthesis of production systems. In order to implement the concept of waste minimization, it is proposed to separate the industrial wastewater into flows based on the concentration and values of the main parameters, as well as to protect the cheese whey from entering the water treatment facilities and direct it for disposal. The possibilities of implementing the concepts of deep raw materials processing into a target product have been analyzed, as well as the full utilization of raw and auxiliary materials. To this end, an experimental study was performed on the extraction of protein clots and adjusting the buffer capacity of infant dairy products using cheese whey. The study results indicate the insufficient effect of extracting the protein clot from whey (5–50 %) by combining the thermal and chemical processes. It was established that the redox conditions of the medium, in terms of the Eh indicator, can significantly affect the results, in close connection with the pH parameter and the estimated value of rH2. It was found that the optimal conditions for the functioning of lactic acid microflora in the production of soft cheeses can be ensured by adjusting the Eh indicator through the introduction of whey of pH=4.4–4.6 units, Eh≤–0.1 V. Whey is introduced at the stage of dairy raw material fermentation, which creates optimal conditions for the formation of a clot until reaching rH2 in the range from −5 to –7, and increases the product output by 1.5–7 %. The results of the experimental study indicate the high potential of using whey desalinated by ion exchange in order to reduce the buffer capacity in terms of acidity and adjust the redox conditions for infant milk mixtures until achieving rH2=15.5–15.9. The research reported in this paper could be the basis for the further development of systems for the integrated processing of dairy raw materials in the cheesemaking industry

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