The complexation behavior of pillar[6]arene hosts towards a carbonium ion, tropylium tetrafluoroborate (T·BF4), and the formation of novel charge-transfer (CT) inclusion complexes are described. In contrast, smaller pillar[5]arenes and larger pillar[7]arenes cannot form such complexes due to the unsuitable cavity dimensions.

Background and purpose - Different radiographic classifications have been proposed for prediction of outcome in Perthes disease. We assessed whether the modified lateral pillar classification would provide more reliable interobserver agreement and prognostic value compared with the original lateral pillar classification and the Catterall classification. Patients and methods - 42 patients (38 bo...

In order to evaluate the coal pillar stability in recovery of residual room pillars under different mining rates, this paper studies influence loading rate on mechanical properties body. The uniaxial compression tests samples Yangcheng area at rates were carried out with MTS815 electrohydraulic servo rock mechanics test system. stress-strain curves and evolution characteristics AE signals analy...

In order to protect surface buildings and maximize the recovery of coal resources, there are a large number strip pillars unfilled goafs left in mining areas China. Affected by comprehensive factors such as long-term overlying rock load, water accumulation goafs, adjacent mining, instability probability pillar increases greatly, which becomes potential hidden danger disaster. However, law movem...

A pillar[4]arene[1]quinone and a difunctionalized pillar[5]arene have been synthesized by partial oxidation.

Abstract In recent years, the rockburst induced by steeply inclined coal seam mining in Urumqi area has become serious. this paper, evolution law of multiplex microseismic information before and after is obtained through in-depth field data. addition, characteristics activities coal-rock mass meizoseismal are revealed from three important scales: time, space, strength. The results show followin...