Room‐Temperature Transport Properties of Graphene with Defects Derived from Oxo‐Graphene

In recent years, graphene oxide has been considered as a soluble precursor of graphene for electronic applications. However, the performance lags behind that of graphene due to lattice defects. Here, the relation between the density of defects in the range of 0.2 % and 1.5 % and the transport properties is quantitatively studied. Therefore, the related flakes of monolayers of graphene were prepared from oxo‐functionalized graphene (oxo‐G). The morphologic structure of oxo‐G was imaged by atomic force microscopy (AFM) and scanning tunneling microscopy (STM). Field‐effect mobility values were determined to range between 0.3 cm2 V−1 s−1 and 33.2 cm2 V−1 s−1, which were inversely proportional to the density of defects. These results provide the first quantitative description of the density of defects and transport properties, which plays an important role for potential applications

Failure characteristic and fracture evolution law of overburden of thick coal in fully mechanized sub-level caving mining

In mining process, the height of water flowing fractured zone is important significance to prevent mine of water and gas, in order to further research the failure characteristic of the overlying strata. Taking certain coal mine with 5.82 m mining height as the experimental face, by using the equipment which is sealed two ends by capsules in borehole, affused measurable water between the two capsules and borehole televiewer system, ground penetrating radar, microseismic monitoring system in underground coal mine, the height of water flowing fractured zone of fully-mechanized top caving are monitored, a numerical simulation experiment on the failure process was conducted, a similarity simulation experiment on the cracks evolution was conducted, at the same time, empirical formula of traditional was modified, The results showed that the height of caving and fractured zones were respectively 43.1 and 86.7 m in fully mechanized sub-level caving mining. The data difference of each test method of caving, fractured and water flowing fractured zones were respectively less than 4.5%, 7.1% and 9.0%. The degree of fracture development was low before mining, the number of fissures was obviously increased after mining, the degree of fracture development increased. The fractures cluster region mainly focuses near the coal wall. The fractures density distribution curves of overlying strata like sanke-shapes. The new and adapt to certain coal mine geological conditions empirical formula of water flowing fractured zone height is proposed

Sunspot tilt angles revisited: Dependence on the solar cycle strength

The tilt angle of sunspot groups is crucial in the BL type dynamo. Some studies have shown that the tilt coefficient is anti-correlated with the cycle strength. If the anti-correlation exists, it will be shown to act as an effective nonlinearity of the BL-type dynamo to modulate the solar cycle. However, some studies have shown that the anti-correlation has no statistical significance. We aim to investigate the causes behind the controversial results of tilt angle studies and to establish whether the tilt coefficient is indeed anti-correlated with the cycle strength. We first analyzed the tilt angles from DPD. Based on the methods applied in previous studies, we took two criteria to select the data, along with the linear and square-root functions to describe Joy's law, and three methods to derive the tilt coefficients for cycles 21-24. This allowed us to evaluate different methods based on comparisons of the differences among the tilt coefficients and the tilt coefficient uncertainties. Then we utilized Monte Carlo experiments to verify the results. Finally, we extended these methods to analyze the separate hemispheric DPD data and the tilt angle data from Kodaikanal and Mount Wilson. The tilt angles exhibit an extremely wide scatter due to both the intrinsic mechanism for its generation and measurement errors, for instance, the unipolar regions included in data sets. Different methods to deal with the uncertainties are mainly responsible for the controversial character of the previous results. The linear fit to the tilt-latitude relation of sunspot groups with $\Delta s>2.5$ of a cycle carried out without binning the data can minimize the effect of the tilt scatter on the uncertainty of the tilt coefficient. Based on this method the tilt angle coefficient is anti-correlated with the cycle strength with strong statistical significance.Comment: 14 pages, 7 figures, 8 Tables, Accepted for publication in A&

Bis(N,N-dimethyl­formamide-κO)bis­(1-methyl­imidazole-2-carbaldehyde oximato-κ2 N,O)manganese(III) perchlorate

In the title compound, [Mn(C5H6N3O)2(C3H7NO)]ClO4, the MnIII atom lies on the inversion centre of the centrosymmetric complex cation and has a distorted octa­hedral coordination geometry, formed by two N atoms and two O atoms from two 1-methyl­imidazole-2-carbaldehyde oximate ligands and two O atoms from two dimethyl­formamide ligands. Perchlorate acts as a counterion to balance the charge. The crystal structure of the title compound is stabilized by C—H⋯O hydrogen-bonding inter­actions

PO-300 Investigation On Dietary Nutrition Status of Chinese Elite Male Young Soccer Player

Objective To evaluate the dietary nutritional of Chinese Elite male young soccer player through the knowledge, attitude, behavior (KAP) survey and an adjusted dietary balance index （DBI）. Methods Explored the dietary nutritional status of 30 Chinese Elite male young soccer players through the knowledge, attitude, behavior (KAP) survey. Diet status of 30 Chinese Elite male young soccer players was collected by food-weighing method. The dietary index of DBI-low bound score（LBS），DBI-high bound score （HBS） and DBI-diet quality distance （DQD） in the adjusted DBI-07 system and nutrient analysis were used to evaluate the dietary quality of athletes. Results The average score of nutrition knowledge (general nutrition and sports nutrition knowledge) in the KAP questionnaire of Chinese Elite young players was 16.90±2.49, and the average score of nutritional attitude was 14.07±2.27. The mean score of the dietary behavior was 39.67±2.65. The total score average was 70.63±4.58.The results of the dietary intake survey showed that the percentage of calorie intake of Chinese Elite male young soccer players who eat three meals a day and snacks were 24.19%, 34.93%, 27.43%, and 13.45%. The proportion of energy intake of carbohydrates, fats, and proteins to total energy were 54.93%, 32.18%, and 11.53%, respectively. The results of the dietary quality survey showed that the median score of LBS of Chinese Elite male young soccer players was 21, the proportion of players with low level of intake was 83.3%, and the proportion of people with moderate and high levels of inadequacy was 16.7%. The median of HBS was 7.5,90.0% of players had low levels of dietary intake in excess, and 10.0% of players had moderate levels of dietary intake in excess. The median of DQD was 34.5. Among the players, 46.7% of athletes have low-level dietary imbalances, and 53.3% of players had moderate-to-high-level dietary imbalances. Conclusions The score of nutritional attitudes and dietary behaviors of 30 Chinese elite male young soccer players are relatively better than that of nutrition knowledge. Young soccer players have unreasonable dietary behaviors. Excessively intake too much fat in the three major nutrients and snacks.The intake of protein, vitamin A, vitamin C, calcium, iron and zinc was inadequate .In terms of dietary intake, most players have high-level dietary imbalances, and players have inadequate dietary intake and excessive dietary intake. &nbsp