There are more and more applications of underground wireless communication in coal mines, such as coal mine video monitoring systems, coal mine dispatching systems, and coal mine safety data fusion systems. These coal mining systems require a large amount of data transmission, occupying a large amount of bandwidth, and the mine underground wireless communication resources are limited. It is necessary to allocate these resources reasonably to ensure the effective operation of these services. Coal mine underground radio resource allocation and optimization is the interface resources between the entire coal mine wireless communication system, such as communication bandwidth, signal spectrum and transmission time slot management, including channel multiplexing, packet scheduling, network optimization, load balancing and other related methods. The efficiency of the entire communication system is improved by maximizing the rational use of wireless network resources. In existing coal mine wireless communication resource optimization algorithms, there are adaptive feedback, wireless cooperative channel multiplexing technologies, etc. The existing wireless resource algorithms generally have high complexity, and there is still a certain space between the final calculation result and the optimal solution. This paper studies the existing coal mine underground optimization algorithm and optimizes and improves the existing chaotic neural network. It effectively reduces the complexity of the algorithm and makes the setting of parameters more consistent with the underground coal mine communication environment. At the same time, through a large number of tests, the parameter sets of chaotic neural network are provided, and a coal mine underground wireless resource optimization algorithm based on chaotic neural network is proposed, and the simulation results are given. The simulation results show that the algorithm proposed in this paper can effectively optimize the interface resources between the entire underground coal mine wireless communication system and improve the coal mine resource allocation rate.
Keywords: Underground coal mine, mining wireless communication resource algorithm, chaotic neural network, OFDMA
Minerals constitute the back-bone of economic growth of any nation and India has been eminently endowed with this gift of nature. There is much evidence that exploitation of minerals like coal, iron-ore, copper, lead-zinc has been going on in the country from time immemorial. However, the first recorded history of mining in India dates back to 1774 when an English company was granted permission by the East India Company for mining coal in Raniganj. Thus, India has a mature mining industry built on nearly more than 250 years of experience. The strength of India’s mining sector has fuelled much of its economic development and helped underpin social development. This growth has also seen the increased adoption of sustainable mining methodologies. It is time to harness the developed leading practice solutions in practice at global platform and adapt to Indian mining conditions to operate in a sustainable manner. It is exteremly important to note that Indian mining industry in pursuit of sustainable mining recognizes that environmental accountability; social responsibility and commercial success are now inseparable concepts. Although, Indian mining industry has developed capabilities in environment and water management, innovative approaches to community engagement and development needs special attention for sustainable mining.
Keywords: Economic growth; social development; Indian mining industry; environmental accountability
The main mineral in the iron ore from Hubei was poor magnetite, it has fine granularity and low iron grade. The content of total iron (TFe) in the original ore is from 12% to 20%, and the content of magnetic iron (MFe) was from 6% to 13%. Through the process mineralogy research, crushing product sieving, magnetic analysis and grinding granularity test, the iron ore products with an iron concentrate grade of 68.84% and an iron recovery rate of 72.87% can be obtained. In the study, it was found that the iron grade of the original ore and the magnetic iron (MFe) were 12.11% and 16.34% respectively. The iron grade of ore size of -0.074 mm was low in negative cumulative and positive cumulative analysis. The iron recovery rate was relatively low, i.e., 57.89%, this was due to that 19.89% of the ferric silicate in the sample of the raw ore cannot be recovered. Through dry magnetic separation, the iron grade can be raised to about 2.18%.
Keywords: Poor magnetite; iron grade; magnetic analysis; iron selection test; iron recovery rate; dry magnetic separation
The mechanical properties and engineering characteristics of argillaceous soft rock are special, and its application in subgrade filling can effectively improve the utilization rate of resources. The research on the road performance of argillaceous soft rock materials has become a hot topic. Based on the research status of the road performance of argillaceous soft rock, this paper designs the compaction test, CBR test and compression consolidation test of argillaceous soft rock respectively, rationally analyzes the experimental data, and explores the optimum water content, expansion quantity, compression coefficient and other engineering properties of the argillaceous soft rock, which provides theoretical guidance for the application of subgrade filling engineering of argillaceous soft rock.
Keywords: Argillaceous soft rock, compression consolidation, compression coefficient, engineering characteristics
In order to solve the problem of aggregation and quenching of fluorescent materials, four kinds of zinc complexes of Schiff base were designed and synthesized, and the IR spectra and nuclear magnetic resonance spectroscopy were analyzed. The photo-physical properties of ligands and complexes were analyzed. The results show that the four complexes have good aggregation-induced luminescence enhancement properties. The oxidation potentials of the four complexes are, respectively, the energy gap obtained by UV absorption, and the four complexes level is located in between the energy level, so the four complexes can be used for hole transport materials, can also be used for electronic transmission materials.
Keywords: Aggregation quenching; infrared spectroscopy; photo-physicality; electrochemical performance; energy level
Coal is still a staple energy resource in India meeting over 50% of its energy requirement. Eastern Indian states are particularly blessed with coal with vast availability in Odisha, Jharkhand, West Bengal and Chhattisgarh. It has some major coalfields like Jharia, East and West Bokaro, Raniganj, Barakar, Karnpura, Ib valley, Talcher and Korba coalfields to name a few. Incidentally the land undulations, rivers, forest and geography render a climate range that supports soil fertility with rich promises of agricultural harvest. An additional booty of highly rich ecosystem services and aesthetics are offered due to pristine forest in the region. A balance has always been in the wish list that may bring inclusion and sustainability but so far been lurking. Mining companies must encompass sustainability as its key governing principle in corporate philosophy. Sustainability encompasses harmony in dimensions of society, economy and ecology (SEE) to be incorporated in its entire operating practices (exploration to mine closure) in order to realize sustainable and inclusive growth. The essence of the paper can be summarized by quoting a shloka from Atharva Veda:
“What of thee,
I dig out
Let that quickly grow over
Let me not hit,
In order to meet ever evolving aspirations of growing population, adaptation to practices of sustainable agriculture appears a must. Meeting the need of food, feed, fiber and fuel for human and live-stocks, maintaining the sustainable balance among its various parameters extending to land, water, soil, biodiversity, agro biodiversity Post-mining restoration of people’s profile in Indian coalfields – an attempt towards safeguarding human rights and agro ecosystem appears sine-qua-non. In totality, it constitutes the base of entire gamut of natural resources.
Keywords: Post-mining restoration, peoples’ profile, human rights
A new single-effect plate-fin desalination unit which utilizes solar or waste energy has been developed. This patented process is applicable for seawater desalination using simple and modular technology. In order to demonstrate the performances of this new process, a laboratory unit was constructed. It is composed of five evaporation cell, condensation cell, and heating cell and cooling cell. In this unit, a relatively large fraction of latent and sensible heat of condensation along with brine is successfully recycled and utilized. Since the falling film evaporation and fins are use, the average distilled water production is 0.5 m3/d. and the yield is about two times greater than that of a conventional single basin solar still with the same thermal energy input. The mean heat exchange coefficient between heating cell and evaporating film was around 2500 Wm-2K-1. The first result concerning the influence of the heating fluid temperature and the heating fluid flow rate are presented. Other factors which influence the freshwater yield are also discussed.
Keywords: Solar, plate-fin, desalination system, evaporation ratio
In this paper, the fluorescence enhancement effect of silicon carbide nano-particles is studied in order to expand the application of silicon carbide nano-particles in optical and life sciences. Firstly, the luminescence mechanism, surface fluorescence enhancement and fluorescence spectrum of silicon carbide nano-materials were analyzed and metal nano-particles have enhancement effect to the surface fluorescence silicon carbide nano-materials. Then, taking silver self-assembled film metal nano-particles as an example, the preparation of silicon carbide nano-particles and silver nano-particles were performed, and the preparation methods of silver self-assembled films with different layers were described. Finally, spectral analysis of fluorescence enhancement of silicon carbide nano-particles based on silver self-assembled films was performed in an empirical manner. Through analysis, it can be seen that with the increase of the number of polyelectrolyte layers, the emission spectrum of the sample shows a trend of increasing first and then decreasing, which provides a direction for future fluorescence enhancement of silicon carbide nanomaterials.
Keywords: Silicon carbide nano-particles; silver selfassembled films; polyelectrolytes; spectral analysis; fluorescence enhancement
SiC material is a kind of material with excellent properties, in order to inhibit it’s oxidation behaviour and prolong the service life of the material during the process of using, the oxidation behaviour of three kinds of SiC materials containing different amounts of Cp in the three temperature ranges from 400oC to 1100oC is studied in this paper. It emphatically analyzes the relations among Cp/SiC’s quality change fraction in air and oxidation temperature, oxidation time, Cp/SiC’s apparent porosity and oxidation temperature, Cp/SiC’s bending strength and oxidation temperature, oxidation time. It is concluded that the Cp content of SiC is the key factor to influence the strength and oxidation behaviour of composite materials and the kind of SiC composite ceramics which add Cp can improve oxidation resistance of the materials.
Keywords: Temperature range, oxidation behaviour, mass change rate, show porosity, Bending strength
A new single-effect plate-fin desalination unit which utilizes solar or waste energy has been developed. This patented heating fluid temperature and the heating fluid flow rate are presented. Other factors which influence the freshwater yield are also discussed.This article in view of the Compound 1 to Compound 6 (six) kinds of organic small molecule photovoltaic material preparation, thermal properties, UV-vis absorption spectroscopy, fluorescence spectroscopy, electrochemical properties and its ontology with PC60BM heterostructure of solar cell device is analyzed, in order to explore the performance differences of different organic small molecules, provide theoretical guidance for the preparation and development of photovoltaic materials. The results show that increase in the compound rigid structure helps to improve its thermal stability. The UV absorption spectra and fluorescence spectra of organic photovoltaic small molecules are mainly determined by receptor units, when the receptor cell contains three different kinds of donor cells of organic small molecule optical performance difference is not very big, and the UV absorption spectrum of DPP series is wider than that of the benzothiadiazole series. The bandgap size of the six compounds containing triphenylamine depends mainly on the narrow band gap in the small molecule; the triphenylamine is stronger than the carbazole hole transport capacity and fluorene, but its solubility is relatively poor; the DPP series of optical performance and benzothiadiazole is better, but the PV performance is not as benzothiadiazole series.
Keywords: Performance model, organic small molecule, photovoltaic materials, photochemical properties, electrochemical properties