With the rise of coal mine underground reservoir engineering in the Shendong Mining Area, the space time dynamic evolution prediction of storage coefficient is becoming one of the critical technical problems for long-term reservoir operation. This coefficient directly determines the storage capacity and the comprehensive benefits of the operation of a coal mine underground reservoir. To this end, the proposed underground reservoir in Daliuta coal mine (No. 22616 working face) is selected in this study for the development and application of an experimental device to measure the storage coefficient. Rock and coal fragments from similar materials are prepared, which are filled and loaded according to the caving rock nature as well as the lumpiness and accumulation mode characteristics pertaining to No. 22616 working face. Subsequently, the measured storage coefficient under circulating water injection conditions revealed a four-dimensional spatial and temporal pattern. It followed the law of storage coefficient under joint interaction of water-rock and stress. The results showed that, prior to the experiment, rock and coal fragments made from similar materials had good water resistance when the paraffin content was set at 8%. The three stress zones were defined based on a theoretical analysis, which were applied on the corresponding loads. During the experiments, significant regional differences were found in the top surface with persisting subsidence of each stress loading zone. Hence, compared with its initial state, the maximum subsidence in the stress stability zone, the stress recovery zone, and the low-stress zone was 7.89, 5.8, and 1.83 mm, respectively. While the storage capacity and the storage coefficient gradually decreased, the former ranged from 0.2429 to 0.2397 m3, and the latter ranged from 0.270 to 0.266. The experimental results are verified by drainage engineering tests in the Shendong Mining Area. In essence, the storage coefficient had remarkable spatial distribution characteristics and a time-varying effect. In space, the storage coefficient increased with height along the vertical direction of the coal mine underground reservoir. However, it decreased with the distance from the boundary of the dam body in the horizontal direction. With time, the storage coefficient decreased dynamically. This study provides a new way of predicting the storage coefficient of a coal mine underground reservoir.
This article attempts to show the importance of newspaper advertisements as a factual source which offers valuable insights into past events. The study of advertisements helps the researcher to complement and verify what has been gleaned from the usual documents, and sometimes can even provide a corrective to conclusions reached by other means. In particular, the advertisements in Lwowskie Tygodniowe Wiadomości [Lwów Weekly News], published 1786–1788 show how much information about property from the monasteries of Galicia, dissolved by Emperor Joseph II in 1782–1788, can be found in the local press. It is a source which not only contains important clues about the history and the scale of the dissolution but also a wealth of minor details that it would be hard find anywhere else.
Up to the present day Suhrawardy remains a controversial figure in both parts of Bengal, with Hindus often seeing him as their fierce persecutor and Bangladeshi Muslims hailing him as their country’s forefather and preacher of communal unity. This article analyses his actions during the period of his Prime Ministership (1946–1947) looking for the sources of the above dichotomy. It argues that although Suhrawardy displayed a mild communal bias at times, circumstances made him inconsistent, being as he was trapped between right wing of Muslim League, the Hindu masses unwilling to trust him and (until the end of 1946) Congress ambitions to inherit the whole Raj. The need to act quickly due to Viceroy Mountbatten’s haste, as well as the PM’s lack of social skills were other factors contributing to failure of his last initiative – United Bengal Scheme – despite his genuine efforts towards Hindu-Muslim settlement and agrarian reforms.