Abstract Sublevel shrinkage (SLSh) is an underground mining method similar to sublevel caving (SLC) but with continuous backfilling from the top. It features a top-down sequence production drifts orientated in longitudinal or transverse way orebody. Fan drilling and blasting done drifts, where ore then drawn. While drawing, backfill introduced at top flows down by gravity, which supports walls ...

Ding dongmerrily on high, goes the famous Christmas carol, but for some of the United Kingdom’s 40 000 campanologists the bells have not been ringing so merrily. Instead, church bell ringers have this year been complaining of a disorder that has been forcing them to abandon their towers and steeples and seek out hypnotherapists and counsellors in search of a cure. Symptoms include vertigo, a se...

BACKGROUND: Seed aging is an important problem in developing countries which seeds stored in inappropriate condition. OBJECTIVES: Current research was carried out to study the effect of seed aging on quantitative parameters of wheat seeds (Chamran cultivar). METHODS: Experiment was carried out based on randomized complete block desi...

The COVID-19 pandemic has hit humanity, straining health care systems, economies, and governments worldwide. In one of the responses to pandemic, a big global effort been mounted collect, analyze, make data publicly available. However, many existing public datasets are (i) aggregated at country level, (ii) tend not bring COVID-19-specific coupled with socio-demographic, economic, policy, health...

The hydrogen abstraction reaction of OH radical with CH3CH2OCF2CHF2 (HFE-374pc2) is investigated theoretically by semi-classical transition state theory. The stationary points on the potential energy surface of the reaction are located by using KMLYP density functional method along with 6-311++G(d,p) basis set. Vibrational anharmonicity coefficients, ...