Following a rice or wheat harvest, a large amount of crop residue （straw） is retained in fields. The straw is often incorporated into the soil in order to increase the soil organic carbon storage and to reduce soil ...Following a rice or wheat harvest, a large amount of crop residue （straw） is retained in fields. The straw is often incorporated into the soil in order to increase the soil organic carbon storage and to reduce soil erosion. However, it has become apparent that the incorporated straw can significantly alter soil shear properties, which can dramatically affect energy inputs for tilling and other soil management practices. In this study, laboratory-remolded wheat straw-soil samples were compared with field-collected straw-soil samples; we found high correlations for the cohesion （R2=0.9084） and internal friction angle （R2=0.9548） properties of the samples. Shear tests on rice and wheat straw with different moisture content levels clearly demonstrated the relatively higher shear strength of wheat straw compared to rice straw. The cohesion of remolded rice and wheat straw-soil samples exhibited an increasing linear trend with an increase in densities, whereas the internal friction angle data for these samples exhibited a quadratic trend. Overlapping the cohesion curves revealed that the wheat straw-soil and rice straw-soil samples had the same cohesion at a straw density of 0.63%. Similar results were obtained when the internal fraction angle curves overlapped; the resultant point of intersection was observed at a straw density of 0.46%. As a whole, the remolded sample methodology was found suitable to simulate the shear properties of soils sampled directly from fields.展开更多
Background Type B aortic dissections(TBAD)are catastrophic conditions with high complication and mortality rates. This study aimed to investigate the prognostic significance of CDK13 expression in patients with type B...Background Type B aortic dissections(TBAD)are catastrophic conditions with high complication and mortality rates. This study aimed to investigate the prognostic significance of CDK13 expression in patients with type B aortic dissection(TBAD)undergoing thoracic endovascular aortic repair(TEVAR). Methods Totally 56 patients with TBAD undertaken TEVAR were included in this study,CDK13 expression was detected in blood samples which were collected from vein before angiography. We reviewed hospital readmission records and outpatient clinic interviews for possible events. The primary endpoint was long-term all-cause mortality. The secondary endpoints were in-hospital major adverse clinical events(MACEs). Results A total of 56 patients(mean age 61.2±12.4 years)were included in the study. We divided the patients into 2 risk levels(28 patients for each level)according to the median of CDK13 expression. The in-hospital mortality(3.6% vs. 14.2%,P<0.05)and MACEs(10.7% vs. 39.3%,P<0.05)were significant higher in patients with high CDK13 level(≥ median).Conclusions The expression level of CDK13 could be considered as a relatively simple tool for pre-TEVAR risk stratification.[S Chin J Cardiol 2019;20(2):121-124]展开更多
基金financially supported by the National Natural Science Foundation of China (51275250)
文摘Following a rice or wheat harvest, a large amount of crop residue （straw） is retained in fields. The straw is often incorporated into the soil in order to increase the soil organic carbon storage and to reduce soil erosion. However, it has become apparent that the incorporated straw can significantly alter soil shear properties, which can dramatically affect energy inputs for tilling and other soil management practices. In this study, laboratory-remolded wheat straw-soil samples were compared with field-collected straw-soil samples; we found high correlations for the cohesion （R2=0.9084） and internal friction angle （R2=0.9548） properties of the samples. Shear tests on rice and wheat straw with different moisture content levels clearly demonstrated the relatively higher shear strength of wheat straw compared to rice straw. The cohesion of remolded rice and wheat straw-soil samples exhibited an increasing linear trend with an increase in densities, whereas the internal friction angle data for these samples exhibited a quadratic trend. Overlapping the cohesion curves revealed that the wheat straw-soil and rice straw-soil samples had the same cohesion at a straw density of 0.63%. Similar results were obtained when the internal fraction angle curves overlapped; the resultant point of intersection was observed at a straw density of 0.46%. As a whole, the remolded sample methodology was found suitable to simulate the shear properties of soils sampled directly from fields.
基金supported by Guangdong Natural Science Foundation(No.2018A030313029)
文摘Background Type B aortic dissections(TBAD)are catastrophic conditions with high complication and mortality rates. This study aimed to investigate the prognostic significance of CDK13 expression in patients with type B aortic dissection(TBAD)undergoing thoracic endovascular aortic repair(TEVAR). Methods Totally 56 patients with TBAD undertaken TEVAR were included in this study,CDK13 expression was detected in blood samples which were collected from vein before angiography. We reviewed hospital readmission records and outpatient clinic interviews for possible events. The primary endpoint was long-term all-cause mortality. The secondary endpoints were in-hospital major adverse clinical events(MACEs). Results A total of 56 patients(mean age 61.2±12.4 years)were included in the study. We divided the patients into 2 risk levels(28 patients for each level)according to the median of CDK13 expression. The in-hospital mortality(3.6% vs. 14.2%,P<0.05)and MACEs(10.7% vs. 39.3%,P<0.05)were significant higher in patients with high CDK13 level(≥ median).Conclusions The expression level of CDK13 could be considered as a relatively simple tool for pre-TEVAR risk stratification.[S Chin J Cardiol 2019;20(2):121-124]
