Failure Characteristics of W Straps Based on Field Observations and Laboratory Tests

Abstract W straps are important surface supporting components. When they cooperate properly with inner supporting components, such as rock bolts and cable bolts, they can enhance the supporting effects and bridging bolting units with integrity. Unfortunately, relevant studies regarding this topic have not been extensively reported. In this study, the failure characteristics of the W strap in the field are discussed and different types of distortion are proposed. Followed by the detailed failure patterns of the strap, a possible mechanism and solution are hypothetically put forward, which are then both numerically and experimentally verified. Afterwards, a loading apparatus capable of examining the mechanical behaviours of the strap is designed, which can similarly recreate the loading environment of the strap to the situation in the engineering field. By virtue of the designed loading device, a series of failure patterns of the bolting system are presented, and the distortion degree of the strap is evaluated using a 3D scanning method. The major findings in this study are as follows: 1) a domed face plate is better than a square domed face plate; 2) the existence of a hole beneath the strap in engineering applications can easily induce failure; and 3) cracked but compacted gravel-like roof strata beneath the strap may not cause damage to the strap-bolt supporting system. These ideas present new understandings in terms of the working conditions of W straps in coal mine roadway supporting systems, and the results can be referred to by practitioners.

Download Full-text

Design, Development and Comparison of Heuristic Driven Algorithms Based on the Crossed Domain Products’ Reviews for User’s Summarization

Recent Advances in Computer Science and Communications ◽

10.2174/2213275912666190626110342 ◽

2020 ◽

Vol 13 (5) ◽

pp. 884-892

Author(s):

Sartaj Ahmad ◽

Ashutosh Gupta ◽

Neeraj Kumar Gupta

Keyword(s):

Decision Making ◽

Online Shopping ◽

Recent Time ◽

Design Development ◽

Different Types ◽

Feature Based ◽

Use Of Internet ◽

Day By Day ◽

Better Than

Background: In recent time, people love online shopping but before any shopping feedbacks or reviews always required. These feedbacks help customers in decision making for buying any product or availing any service. In the country like India this trend of online shopping is increasing very rapidly because awareness and the use of internet which is increasing day by day. As result numbers of customers and their feedbacks are also increasing. It is creating a problem that how to read all reviews manually. So there should be some computerized mechanism that provides customers a summary without spending time in reading feedbacks. Besides big number of reviews another problem is that reviews are not structured. Objective: In this paper, we try to design, implement and compare two algorithms with manual approach for the crossed domain Product’s reviews. Methods: Lexicon based model is used and different types of reviews are tested and analyzed to check the performance of these algorithms. Results: Algorithm based on opinions and feature based opinions are designed, implemented, applied and compared with the manual results and it is found that algorithm # 2 is performing better than algorithm # 1 and near to manual results. Conclusion: Algorithm # 2 is found better on the different product’s reviews and still to be applied on other product’s reviews to enhance its scope. Finally, it will be helpful to automate existing manual process.

Download Full-text

Fighting Together against the Pandemic: Learning Multiple Models on Tomography Images for COVID-19 Diagnosis

AI ◽

10.3390/ai2020016 ◽

2021 ◽

Vol 2 (2) ◽

pp. 261-273

Author(s):

Mario Manzo ◽

Simone Pellino

Keyword(s):

Network Architecture ◽

State Of The Art ◽

Ensemble Classification ◽

Effective Vaccine ◽

Rt Pcr ◽

Neural Network Architecture ◽

Experimental Phase ◽

Different Types ◽

Polymerase Chain ◽

Better Than

COVID-19 has been a great challenge for humanity since the year 2020. The whole world has made a huge effort to find an effective vaccine in order to save those not yet infected. The alternative solution is early diagnosis, carried out through real-time polymerase chain reaction (RT-PCR) tests or thorax Computer Tomography (CT) scan images. Deep learning algorithms, specifically convolutional neural networks, represent a methodology for image analysis. They optimize the classification design task, which is essential for an automatic approach with different types of images, including medical. In this paper, we adopt a pretrained deep convolutional neural network architecture in order to diagnose COVID-19 disease from CT images. Our idea is inspired by what the whole of humanity is achieving, as the set of multiple contributions is better than any single one for the fight against the pandemic. First, we adapt, and subsequently retrain for our assumption, some neural architectures that have been adopted in other application domains. Secondly, we combine the knowledge extracted from images by the neural architectures in an ensemble classification context. Our experimental phase is performed on a CT image dataset, and the results obtained show the effectiveness of the proposed approach with respect to the state-of-the-art competitors.

Download Full-text

Deep Learning Methods for Classification of Certain Abnormalities in Echocardiography

Electronics ◽

10.3390/electronics10040495 ◽

2021 ◽

Vol 10 (4) ◽

pp. 495

Author(s):

Imayanmosha Wahlang ◽

Arnab Kumar Maji ◽

Goutam Saha ◽

Prasun Chakrabarti ◽

Michal Jasinski ◽

...

Keyword(s):

Deep Learning ◽

Short Term Memory ◽

Support Vector ◽

Variational Autoencoder ◽

Different Types ◽

Static Images ◽

Long Short Term Memory ◽

2D And 3D ◽

Better Than

This article experiments with deep learning methodologies in echocardiogram (echo), a promising and vigorously researched technique in the preponderance field. This paper involves two different kinds of classification in the echo. Firstly, classification into normal (absence of abnormalities) or abnormal (presence of abnormalities) has been done, using 2D echo images, 3D Doppler images, and videographic images. Secondly, based on different types of regurgitation, namely, Mitral Regurgitation (MR), Aortic Regurgitation (AR), Tricuspid Regurgitation (TR), and a combination of the three types of regurgitation are classified using videographic echo images. Two deep-learning methodologies are used for these purposes, a Recurrent Neural Network (RNN) based methodology (Long Short Term Memory (LSTM)) and an Autoencoder based methodology (Variational AutoEncoder (VAE)). The use of videographic images distinguished this work from the existing work using SVM (Support Vector Machine) and also application of deep-learning methodologies is the first of many in this particular field. It was found that deep-learning methodologies perform better than SVM methodology in normal or abnormal classification. Overall, VAE performs better in 2D and 3D Doppler images (static images) while LSTM performs better in the case of videographic images.

Download Full-text

Etude par spectrométrie infrarouge de l'action de solvants aprotiques sur l'association ester–eau et ester–Ba2+. Discussion du rôle catalytique du solvant et de l'ion Ba2+ dans l'hydrolyse alcaline du propionate de methyle

Canadian Journal of Chemistry ◽

10.1139/v79-067 ◽

1979 ◽

Vol 57 (4) ◽

pp. 400-403 ◽

Cited By ~ 1

Author(s):

Anne Le Narvor ◽

Pierre Saumagne

Keyword(s):

Ir Spectra ◽

Charge Density ◽

Carbonyl Group ◽

Alkaline Hydrolysis ◽

Experimental Results ◽

Methyl Propionate ◽

Orbital Control ◽

Different Types ◽

Kinetics Of ◽

Better Than

The ir spectra of mixtures of methyl propionate/water and methyl propionate/Ba2+ in dimethylsulfoxide and in acetonitrile have been recorded in the region of the νCO mode of the ester. Evidence is presented to indicate the presence of different types of complexes; their concentration was determined as a function of the composition of the medium. The spectroscopic results are compared to those from the kinetics of the alkaline hydrolysis in the same conditions. It is demonstrated that the orbital control explains the experimental results better than does the charge density on the carbon of the carbonyl group. [Journal translation]

Download Full-text

The structures of benzimidazole derivatives and their potential as tuberculostatics

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229618014675 ◽

2018 ◽

Vol 74 (12) ◽

pp. 1684-1691

Author(s):

Marek L. Główka ◽

Sylwia Kałużyńska ◽

Malwina Krause ◽

Katarzyna Gobis ◽

Henryk Foks ◽

...

Keyword(s):

Multidrug Resistant ◽

Benzimidazole Derivatives ◽

X Ray Diffraction ◽

Intermolecular Hydrogen Bonds ◽

X Ray ◽

Resistant Varieties ◽

Different Types ◽

Mdr Tb ◽

Aromatic Systems ◽

Better Than

Tuberculosis still remains a very important problem, especially its multidrug resistant varieties (MDR-TB). Among the potential tuberculostatics, there are two benzimidazole derivatives, namely 5,6-dimethyl-2-phenylethylbenzo[d]imidazole (1) and (E)-5,6-dimethyl-2-styryl-1H-benzo[d]imidazole (2) which showed significant tuberculostatic activities, better than those of Pyrazinamide and Isoniazyd. Also, the cytotoxicity of 1 appeared promising. The compounds were studied (with the use of X-ray diffraction) in the form of the hemihydrate of 1, C17H18N2·0.5H2O (1a), the methanol hemisolvate of 2, C17H16N2·0.5CH3OH (2a), and the acid oxalate salt of 2, namely (E)-5,6-dimethyl-2-styryl-1H-benzo[d]imidazolium hydrogen oxalate, C17H17N2 +·C2HO4 − (2b). All three structures reveal a similar extended conformation, despite the flexible linker between the two aromatic systems and the different types of strong intermolecular hydrogen bonds. The molecules of 2a are practically planar due to the double bond in the linker, which enables conjugation along the whole molecule, while the molecules of 1a exhibit the possibility of parallel orientations of their aromatic systems, despite the aliphatic (ethyl) linker.

Download Full-text

Free-Choice, Final Performance and Attitudes toward Different Types of Programmed Instruction

Journal of Education ◽

10.1177/002205747315500307 ◽

1973 ◽

Vol 155 (3) ◽

pp. 56-63

Author(s):

Avraham Scherman ◽

Marion Scherman

Keyword(s):

Free Choice ◽

Programmed Instruction ◽

Traditional Lecture ◽

Fourth Class ◽

Choice Group ◽

Different Types ◽

Mode Of Instruction ◽

Experimental Subjects ◽

Better Than ◽

Instruction Approach

One-hundred thirty-six students enrolled in four classes of a counseling theories course served as the experimental subjects. In three classes students were randomly assigned to one of three modes of instruction: prose-text, linear programmed instruction, and branching programmed instruction. Subjects from the fourth class were given free choice to select the mode of instruction preferred. It was found that the free-choice group performed better than the linear and branching programmed instruction groups, although not significantly better than the prose-text group. In response to a questionnaire, males stated that when compared to traditional lecture-type courses, the programmed instruction approach helped them concentrate and resulted in a more efficient use of their time. Females did not think that the use of programmed instruction offered an interesting and stimulating approach.

Download Full-text

Use of computational fluid dynamics to model reservoir mixing and destratification

Water Science & Technology ◽

10.2166/wst.1998.0144 ◽

1998 ◽

Vol 37 (2) ◽

pp. 227-234

Author(s):

Julian D. Cox ◽

Martin B. Padley ◽

Joe Hannon

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Reverse Flow ◽

Dynamics Model ◽

Artificial Mixing ◽

Effective Operation ◽

Different Types ◽

Blade Mixer ◽

Perforated Pipe ◽

Better Than

Destratification of reservoirs by the use of artificial mixing is a method of improving the impounded water quality. In order to design a destratification device at Stocks Reservoir, NW England, a Computational Fluid Dynamics model was used to trial different types and sizes of mixing device. It was found that a perforated pipe bubble mixing device performed far better than a large banana blade mixer at destratifying Stocks Reservoir. Two important criteria for the effective operation of a mixing device were established. These were a minimum upflow velocity of entrained water through the reservoir, and the need for a reverse flow along the surface of the reservoir away from the abstraction point. These criteria have been incorporated into design equations which can be extended to use at other reservoirs. A bubble mixer was installed at Stocks Reservoir, and has been shown to fully destratify the reservoir and to reduce the levels of dissolved manganese in the water by more than 50%.

Download Full-text

Bio-based adhesive mixtures of pine tannin and different types of lignins

BioResources ◽

10.15376/biores.15.4.9401-9412 ◽

2020 ◽

Vol 15 (4) ◽

pp. 9401-9412

Author(s):

Jaša Saražin ◽

Detlef Schmiedl ◽

Antonio Pizzi ◽

Milan Šernek

Keyword(s):

Wood Adhesive ◽

Strength Test ◽

Lap Joint ◽

Joint Shear Strength ◽

Shear Strength Test ◽

Different Types ◽

Natural Phenolic Compounds ◽

Adhesive Mixtures ◽

Substantial Interest ◽

Better Than

Tannins and lignins, which are natural phenolic compounds, are gaining substantial interest in biobased wood adhesive research. In this study, several different biobased tannin-lignin-hexamine adhesive mixtures were prepared and compared in a lap-joint shear strength test. In the first part, the suitability of different types of kraft and organosolv lignins as part of the mixture used in the production of biobased adhesives (in combination with pine tannins) were observed. It was found that biobased adhesive mixtures containing kraft lignins performed significantly better than those that contained organosolv lignins. In the second part, unmodified kraft lignins were mixed with pine tannin in different proportions, ranging from 0% to 100%. The pressing parameters were set to 150 °C for 15 min after performing oscillatory tests with a rheometer. Pure tannin adhesives performed the best, but no significant differences or a trend line were observed among adhesives containing different proportions of tannins and lignins.

Download Full-text

A Compression Algorithm for DNA Palindrome Compression Technique

ITM Web of Conferences ◽

10.1051/itmconf/20203203006 ◽

2020 ◽

Vol 32 ◽

pp. 03006

Author(s):

D. Suneetha ◽

D. Rathna Kishore ◽

P. Narendra Babu

Keyword(s):

Compression Algorithm ◽

Experimental Result ◽

Compression Process ◽

Compression Technique ◽

Plain Text ◽

Security Issues ◽

Cipher Text ◽

Different Types ◽

Dna Palindrome ◽

Better Than

Data Compression in Cryptography is one of the interesting research topic. The compression process reduces the amount of transferring data as well as storage space which in turn effects the usage of bandwidth. Further, when a plain text is converted to cipher text, the length of the cipher text becomes large. This adds up to tremendous information storing. It is extremely important to address the storage capacity issue along with the security issues of exponentially developing information. This problem can be resolved by compressing the ciphertext based on a some compression algorithm. In this proposed work used the compression technique called palindrome compression technique. The compression ratio of the proposed method is better than the standard method for both colored and gray scaled images. An experimental result for the proposed methods is better than existing methods for different types of image.

Download Full-text

The acquisition of the Arabic construct state (CS) constructions by Arabic-speaking children with ASD

Advances in Autism ◽

10.1108/aia-01-2019-0003 ◽

2019 ◽

Vol 5 (4) ◽

pp. 255-267 ◽

Cited By ~ 2

Author(s):

Abdel Rahman Mitib Altakhaineh ◽

Razan N. Alkhatib

Keyword(s):

Autism Spectrum Disorder ◽

Design Methodology ◽

Children With Autism ◽

Autism Spectrum ◽

Head Direction ◽

Content Type ◽

Children With Asd ◽

Different Types ◽

Arabic Speaking ◽

Better Than

PurposeThe purpose of this paper is to investigate whether age plays a role in the acquisition of construct state (CS) constructions in Arabic by 14 children with autism spectrum disorder (ASD). It also examined the challenges faced by children with ASD in producing different types of CS constructions. Finally, the study analysed the sources of difficulties children with ASD encounter during the learning process of the CS.Design/methodology/approachFor the purposes of this study, the participants were asked to orally complete short sentences with the help of illustrative pictures.FindingsResults revealed that the age of the 14 children with ASD plays a role in the acquisition of CS constructions. Children of age 12–15 performed better than those of age 8 and 10. Results also showed that children with ASD performed better in producing phrases rather than compounds. Moreover, the participants performed better on endocentric compounds as opposed to exocentric ones. Finally, analysing the errors produced on the text revealed that the acquisition of head direction precedes definiteness.Originality/valueThe topic of the study has not been investigated yet and the study concluded with some important findings concerning teaching Arabic CS to children with ADS.

Download Full-text