The Concept of Optimal Compaction of the Charge in the Gravitation System Using the Grains Triangle for Cokemaking Process

Two isomorphic sets of grains, small and large, were analysed—without specifying their dimensions—under the acronym CMC (Curve of Maximum Compression) and taking into account the effects of segregation CMCS. The proposal is particularly valuable for optimal blend preparation in the gravity system in cokemaking. The main advantage of this work is the proposal of using the grains triangle, which limits the values calculated by the relations: bulk density-share of coarse/fine grains, for different levels of moisture content. Each system of changing shares of coarse grains is characterised by a constant C, but there is no need to determine it. Compliance of the calculated value with the experimentally determined value means that the given arbitrary grain set has reached its maximum density called the “locus”. The grains triangle practically covers the vast majority of laboratory and industrial test results, and geometrically or computationally indicates the ability of a given particle size distribution to reach maximum bulk density. This paper presents analysis of the results of tests on crushing, coal briquettes, and grinding coal blend in selected mechanical systems. Results of tests on coke quality (CRI, CSR) in connection with the grain size triangle are discussed.

The role of the mass ratio in ballistic capture

ABSTRACT A massless particle can be naturally captured by a celestial body with the aid of a third body. In this work, the influence of the mass ratio on ballistic capture is investigated in the planar circular restricted three-body problem (CR3BP) model. Four typical dynamical environments with decreasing mass ratios, that is, the Pluto–Charon, Earth–Moon, Sun–Jupiter, and Saturn–Titan systems, are considered. A generalized method is introduced to derive ballistic capture orbits by starting from a set of initial conditions and integrating backward in time. Particular attention is paid to the backward escape orbits, following which a test particle can be temporarily trapped by a three-body gravity system, although the particle will eventually deviate away from the system. This approach is applied to the four candidate systems with a series of Jacobi constant levels to survey and compare the capture probability (quantitatively) and capture capability (qualitatively) when the mass ratio varies. Capture mechanisms inducing favourable ballistic capture are discussed. Moreover, the possibility and stability of capture by secondary celestial bodies are analysed. The obtained results may be useful in explaining the capture phenomena of minor bodies or in designing mission trajectories for interplanetary probes.

Assessment ASSESSMENT OF RAIN WATER HARVESTING SYSTEM

The life of the inhabitants of the globe is greatly dependant on water. Providing portable water to communities is of prime interest. Scarcity of water is a threat in near future in Pakistan. There is a need to search for alternate sources of water to fulfil the community requirement. Rainwater Harvesting (RWH) system is a better alternative. Keeping in view the vast application of this system, it is adopted as an alternative source of water in a village of Abbottabad city where there is scarcity of water. According to Public Health Engineering Department (PHED), the currently available gravity system and three tube wells are not sufficient to supply water to all the population. For this study, first, the rainfall data is collected and then by using the principle of rainwater harvesting system, the quantity of available water is calculated. The calculations were made using SCS curve number method using mean monthly rainfall depth. From calculation, we found that not only for current population but for population in 2028 can also be served by storing the water that we get from Rainwater Harvesting system if stored in a reservoir. But after 20 years i.e. in 2038, there will be deficiency of 146, 449 gallons per day of water for entire community which can easily be arranged from a small tube well. Therefore, on the basis of this study, it was recommended to the PHED of Abbottabad city to store the rainwater in a reservoir so that it can be easily utilised.

Perencanaan Sistem Instalasi Pengolahan Air Limbah Komunal di Perumahan Grand Ville Taba Lestari Kota Lubuklinggau Provinsi Sumatera Selatan

The purpose of this research are to plan, design and estimate the construction cost of a communal wastewater treatment system in the Grand Ville Taba Lestari housing town of Lubuklinggau. The domestic wastewater, comes from businesses, residential activities, restaurants, offices, apartments and dormitories. The wastewater distribution system for residential area uses a shallow sewer system, namely domestic wastewater from sanitary ware (latrines, sinks, floor drain, kitchen sink, etc.) directly connected using a wastewater pipe and the wastewater distribution system in this design, uses a gravity system. Communal wastewater treatment plant is expected to prevent and reduce the occurrence of environmental pollution. From the site-plan, the maximum number of occupant are 369 persons, resulting in a wastewater debit of 40.51 m3/day. The designed dimensions of the wastewater treatment plant are based on the amount of wastewater produced, which is 9.5 m long, 3 m wide with a depth of 2 m. Piping network are 475.50 m of parcel pipe, 478.93 m of service pipe, 434.6 m of lateral pipe and 3 m of main pipe. The cost required for constructing the communal wastewater treatment plant in the Grand Ville Taba Lestari Housing is Rp. 335,500,000.00.-.

Responses and capacity curves of mid- and high-rise wood buildings subjected to seismic excitations

The design and modelling of 10-, 15-, and 20-storey wood buildings with cross-laminated timber and glulam structural members are presented in the present study. The system is platform-type construction with a cross-laminated timber core, perimeter walls as lateral load resisting system, and glulam columns as the gravity system. The designed buildings satisfy requirements stipulated in applicable design codes in Canada. The hysteretic models and the associated parameters used to model the fasteners for wood members are developed. Assessments of the nonlinear inelastic seismic responses and capacity curves of the designed buildings are carried out using the incremental dynamic analysis (IDA) and nonlinear static pushover analysis (NSPA) methods. The results indicate that the NSPA curve closely approximates the mean capacity curve estimated using the IDA curves for wood buildings. The post-yield stiffness ratio to initial stiffness for the wood buildings ranges from approximately 0.35 to 0.55. The results also show that the effect of the record-to-record variability on the IDA curves is substantial.

Thermal Quantum Spacetime

The intersection of thermodynamics, quantum theory and gravity has revealed many profound insights, all the while posing new puzzles. In this article, we discuss an extension of equilibrium statistical mechanics and thermodynamics potentially compatible with a key feature of general relativity, background independence; and we subsequently use it in a candidate quantum gravity system, thus providing a preliminary formulation of a thermal quantum spacetime. Specifically, we emphasise an information-theoretic characterisation of generalised Gibbs equilibrium that is shown to be particularly suited to background independent settings, and in which the status of entropy is elevated to being more fundamental than energy. We also shed light on its intimate connections with the thermal time hypothesis. Based on this, we outline a framework for statistical mechanics of quantum gravity degrees of freedom of combinatorial and algebraic type, and apply it in several examples. In particular, we provide a quantum statistical basis for the origin of covariant group field theories, shown to arise as effective statistical field theories of the underlying quanta of space in a certain class of generalised Gibbs states.