Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Iron ore blending in an open-pit mine is an important means to ensure ore grade balance and resource recycling in iron mine industrial production. With the comprehensive recovery and utilisation of resource mining, the multi-source and multi-target ore blending method has become one of the focuses of the mining industry. Scientific and reasonable ore blending can effectively reduce the transportation cost of the enterprise. It can also ensure that the ore grade, washability index and iron carbonate content meet the requirements of the concentrator and significantly improve the comprehensive utilisation rate and economic benefits of the ore. An ore blending method for open-pit iron ore is proposed in this paper. The blending method is realised by establishing the ore blending model. This model aims to achieve maximum ore output and the shortest transportation distance, ore washability index, total iron grade, ferrous iron grade and iron carbonate content after the ore blending meets the requirements. This method can meet the situation of a single mine to a single concentrator and that of a single mine to multiple concentrators. According to the results of ore blending, we can know the bottleneck of current production. Through targeted optimisation management, we can tap the production potential of an open-pit mine.
Go to article

Authors and Affiliations

Jiang Yao
1
Chunhui Liu
2
Guichen Huang
2
Kai Xu
2
Qingbo Yuan
2

  1. Northeastern University, College of Resources and Civil Engineering, Shenyang, Liaoning 110819, China
  2. Ansteel Group GUANBAOSHAN Mining Co., Ltd, Anshan, Liaoning 114000, China
Download PDF Download RIS Download Bibtex

Abstract

The composition of information law’s terminological lexicon requires a comprehensive study in view of its diversity. The article attempts a linguistic characterization of professionalisms and nomens as important functional elements of the specific vocabulary of the informational and legal field. The purpose of the article is to clarify the specifics of different types of special lexemes (nomens and professionalisms) in informational and legal discourse in comparison with the main lexical unit of the terminological system – the term, which involves the analysis of established views of linguists and new trends in terminological studies regarding the studied types of special vocabulary, the linguistic interpretation of professionalism and the nomenclature unit of scientific style. It has been established that in the speech of specialists, professionalisms verbalize special knowledge, and act as synonymous professional‑conversational doublets, name realities and convey special information. They appear in use, replacing officially recognized terms and adapting themselves to oral collective communication. It was found that professionalisms not codified in dictionaries often penetrate into written speech during the coverage of topical issues by journalistic publications or professionally oriented texts. As part of the terminology of information law, a special group has been identified and classified – nomens, which denote single names, most often their own. It was found that they reveal certain difficulties for codification, since a new nomen is not always accompanied by a characteristic. The presence of professionalisms and nomens in information and legal discourse is quite obvious and is explained by the functional expediency of the names used by specialists in special communication.
Go to article

Authors and Affiliations

Liudmyla Arkhypenko
1
Pavlo Melnyk
2

  1. Simon Kuznets Kharkiv National University of Economics
  2. Рarliament of Ukraine
Download PDF Download RIS Download Bibtex

Abstract

This paper presents the design and measurements of low-noise multichannel front-end electronics for recording extra-cellular neuronal signals using microelectrode arrays. The integrated circuit contains 64 readout channels and is fabricated in CMOS 180 nm technology. A single readout channel is built of an AC coupling circuit at the input, a low-noise preamplifier, a band-pass filter and a second amplifier. In order to reduce the number of output lines, the 64 analog signals from readout channels are multiplexed to a single output by an analog multiplexer. The chip is optimized for low noise and good matching performance and has the possibility of pass-band tuning. The low cut-off frequency can be tuned in the 1 Hz - 60 Hz range while the high cut-off frequency can be tuned in the 3.5 kHz - 15 kHz range. For the nominal gain setting at 44 dB and power dissipation per single channel of 220 μW, the equivalent input noise is in the range from 6 μV - 11 μV rms depending on the band-pass filter settings. The chip has good uniformity concerning the spread of its electrical parameters from channel to channel. The spread of the gain calculated as standard deviation to mean value is about 4.4% and the spread of the low cut-off frequency set at 1.6 Hz is only 0.07 Hz. The chip occupies 5×2.3 mm2 of silicon area. To our knowledge, our solution is the first reported multichannel recording system which allows to set in each recording channel the low cut-off frequency within a single Hz with a small spread of this parameter from channel to channel. The first recordings of action potentials from the thalamus of the rat under urethane anesthesia are presented.

Go to article

Authors and Affiliations

Paweł Gryboś
Piotr Kmon
Mirosław Żołądź
Robert Szczygieł
Maciej Kachel
Marian Lewandowski
Tomasz Błasiak
Download PDF Download RIS Download Bibtex

Abstract

Detection of leakages in pipelines is a matter of continuous research because of the basic importance for a waterworks system is finding the point of the pipeline where a leak is located and − in some cases − a nature of the leak. There are specific difficulties in finding leaks by using spectral analysis techniques like FFT (Fast Fourier Transform), STFT (Short Term Fourier Transform), etc. These difficulties arise especially in complicated pipeline configurations, e.g. a zigzag one. This research focuses on the results of a new algorithm based on FFT and comparing them with a developed STFT technique. Even if other techniques are used, they are costly and difficult to be managed. Moreover, a constraint in the leak detection is the pipeline diameter because it influences accuracy of the adopted algorithm. FFT and STFT are not fully adequate for complex configurations dealt with in this paper, since they produce ill-posed problems with an increasing uncertainty. Therefore, an improved Tikhonov technique has been implemented to reinforce FFT and STFT for complex configurations of pipelines. Hence, the proposed algorithm overcomes the aforementioned difficulties due to applying a linear algebraic approach.

Go to article

Authors and Affiliations

Aimé Lay-Ekuakille
Giuseppe Griffo
Paolo Visconti
Patrizio Primiceri
Ramiro Velazquez

This page uses 'cookies'. Learn more