Engineering geomechanics characteristics of roadways in deep soft rock at Hegang Xing'an Coal Mine were studied and the nature of clay minerals of roadway surrounding rock was analyzed. This paper is to solve the ...Engineering geomechanics characteristics of roadways in deep soft rock at Hegang Xing'an Coal Mine were studied and the nature of clay minerals of roadway surrounding rock was analyzed. This paper is to solve the technical problems of high stress and the difficulty in supporting the coal mine, and provide a rule for the support design. Results show that mechanical deformation mechanisms of deep soft rock roadway at Xing'an Coal Mine is of ⅠABⅡABCⅢABCD type, consisting of molecular water absorption (the ⅠAB -type), the tectonic stress type + gravity deformation type + hydraulic type (the ⅡABC -type), and the ⅢABCD -type with fault, weak intercalation and bedding formation. According to the compound mechanical deformation mechanisms, the corresponding mechanical control measures and conversion technologies were proposed, and these technologies have been successfully applied in roadway supporting practice in deep soft rock at Xing'an Coal Mine with good effect. Xing'an Coal Mine has the deepest burial depth in China, with its overburden ranging from Mesozoic Jurassic coal-forming to now. The results of the research can be used as guidance in the design of roadway support in soft rock.展开更多
Ameloblastoma is an odontogenic tumor of high frequency and usually occurs as an intraosseous growth. Ameloblastomas frequently recur, sometimes undergoing malignant transformation. These tumors are usually characteri...Ameloblastoma is an odontogenic tumor of high frequency and usually occurs as an intraosseous growth. Ameloblastomas frequently recur, sometimes undergoing malignant transformation. These tumors are usually characterized as being multilocular, of the follicular type histopathologically, and invading strongly at the border region of the tumor. More than 10% p53-positive tumor cells give a prognostic indication for a tendency to recur. A recurrent ameloblastoma usually occurs in the intraosseous region near the site of the original lesion. In very rare cases, a recurrent tumor proliferates distantly from the original site in the soft tissue only. We report a rare case of recurrent ameloblastoma in the buccal mucosa with a mucocele that originated from the small salivary glands after the extirpation of an intraosseous (mandibular) ameloblastoma. We also performed a p53 immunohistochemical study of this recurrent tumor.展开更多
软开关技术具有快速动态响应、高稳定性、易控制、低损耗等特点,广泛应用于开关电源设备中。然而,功率开关期间快速的电流、电压转换对软开关降压转换器的传导噪声仍然有很大影响。针对上述问题,提出一种新型ZVS(Zero Voltage Switching...软开关技术具有快速动态响应、高稳定性、易控制、低损耗等特点,广泛应用于开关电源设备中。然而,功率开关期间快速的电流、电压转换对软开关降压转换器的传导噪声仍然有很大影响。针对上述问题,提出一种新型ZVS(Zero Voltage Switching)全波型软开关降压转换器拓扑,分析了此转换器的稳定性,运用扩展频谱时钟技术,采用调制谐振上升沿时间方法,不仅降低了转换器输出纹波,而且有效降低了转换器的电磁干扰(ElectroMagnetic Interference,EMI)噪声,通过仿真试验验证了该转换器的性能,与硬开关相比,EMI减低了22 dB,输出纹波减小到4.7 mV。展开更多
目的探究银丹心脑通软胶囊联合厄贝沙坦对高血压合并2型糖尿病患者糖脂代谢及动脉血压变化的影响。方法选取2019年1月至2022年1月宜春市第三人民医院收治的82例高血压合并2型糖尿病患者作为研究对象,随机分为A组与B组,每组41例。A组应...目的探究银丹心脑通软胶囊联合厄贝沙坦对高血压合并2型糖尿病患者糖脂代谢及动脉血压变化的影响。方法选取2019年1月至2022年1月宜春市第三人民医院收治的82例高血压合并2型糖尿病患者作为研究对象,随机分为A组与B组,每组41例。A组应用厄贝沙坦治疗,B组应用厄贝沙坦联合银丹心脑通软胶囊治疗。比较两组治疗前后血糖[空腹血糖(FBG)、餐后2 h血糖(2 h PBG)]、血脂[甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)]、血压[收缩压(SBP)、舒张压(DBP)、24 h平均SBP、24 h平均DBP、24 h SBP平滑指数(24 h SIS)、24 h DBP平滑指数(24 h SID)]水平、同型半胱氨酸(Hcy)、脑钠肽(BNP)水平及不良反应发生情况。结果治疗后,B组FBG、2 h PBG水平均低于A组,差异有统计学意义(P<0.05)。治疗后,B组TG、TC、LDL-C水平均低于A组,差异有统计学意义(P<0.05),两组HDL-C水平比较差异无统计学意义。治疗后,B组SBP、DBP、24 h平均SBP、24 h平均DBP均低于A组,24 h SIS高于A组,差异有统计学意义(P<0.05),两组24 h SID比较差异无统计学意义。治疗后,B组Hcy、BNP水平均低于A组,差异有统计学意义(P<0.05)。两组不良反应发生率比较差异无统计学意义。结论银丹心脑通软胶囊联合厄贝沙坦治疗高血压合并2型糖尿病效果显著,可改善患者糖脂代谢、动态血压水平及血清学指标。展开更多
基金partially supported by program for the New Century Excellent Talents in University (No. NCET-08-0833)the National Natural Science Foundation of China (No. 41040027)the Special Fund of Basic Research and Operating Expenses of China University of Mining and Technology, Beijing
文摘Engineering geomechanics characteristics of roadways in deep soft rock at Hegang Xing'an Coal Mine were studied and the nature of clay minerals of roadway surrounding rock was analyzed. This paper is to solve the technical problems of high stress and the difficulty in supporting the coal mine, and provide a rule for the support design. Results show that mechanical deformation mechanisms of deep soft rock roadway at Xing'an Coal Mine is of ⅠABⅡABCⅢABCD type, consisting of molecular water absorption (the ⅠAB -type), the tectonic stress type + gravity deformation type + hydraulic type (the ⅡABC -type), and the ⅢABCD -type with fault, weak intercalation and bedding formation. According to the compound mechanical deformation mechanisms, the corresponding mechanical control measures and conversion technologies were proposed, and these technologies have been successfully applied in roadway supporting practice in deep soft rock at Xing'an Coal Mine with good effect. Xing'an Coal Mine has the deepest burial depth in China, with its overburden ranging from Mesozoic Jurassic coal-forming to now. The results of the research can be used as guidance in the design of roadway support in soft rock.
文摘Ameloblastoma is an odontogenic tumor of high frequency and usually occurs as an intraosseous growth. Ameloblastomas frequently recur, sometimes undergoing malignant transformation. These tumors are usually characterized as being multilocular, of the follicular type histopathologically, and invading strongly at the border region of the tumor. More than 10% p53-positive tumor cells give a prognostic indication for a tendency to recur. A recurrent ameloblastoma usually occurs in the intraosseous region near the site of the original lesion. In very rare cases, a recurrent tumor proliferates distantly from the original site in the soft tissue only. We report a rare case of recurrent ameloblastoma in the buccal mucosa with a mucocele that originated from the small salivary glands after the extirpation of an intraosseous (mandibular) ameloblastoma. We also performed a p53 immunohistochemical study of this recurrent tumor.
文摘目的探究银丹心脑通软胶囊联合厄贝沙坦对高血压合并2型糖尿病患者糖脂代谢及动脉血压变化的影响。方法选取2019年1月至2022年1月宜春市第三人民医院收治的82例高血压合并2型糖尿病患者作为研究对象,随机分为A组与B组,每组41例。A组应用厄贝沙坦治疗,B组应用厄贝沙坦联合银丹心脑通软胶囊治疗。比较两组治疗前后血糖[空腹血糖(FBG)、餐后2 h血糖(2 h PBG)]、血脂[甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)]、血压[收缩压(SBP)、舒张压(DBP)、24 h平均SBP、24 h平均DBP、24 h SBP平滑指数(24 h SIS)、24 h DBP平滑指数(24 h SID)]水平、同型半胱氨酸(Hcy)、脑钠肽(BNP)水平及不良反应发生情况。结果治疗后,B组FBG、2 h PBG水平均低于A组,差异有统计学意义(P<0.05)。治疗后,B组TG、TC、LDL-C水平均低于A组,差异有统计学意义(P<0.05),两组HDL-C水平比较差异无统计学意义。治疗后,B组SBP、DBP、24 h平均SBP、24 h平均DBP均低于A组,24 h SIS高于A组,差异有统计学意义(P<0.05),两组24 h SID比较差异无统计学意义。治疗后,B组Hcy、BNP水平均低于A组,差异有统计学意义(P<0.05)。两组不良反应发生率比较差异无统计学意义。结论银丹心脑通软胶囊联合厄贝沙坦治疗高血压合并2型糖尿病效果显著,可改善患者糖脂代谢、动态血压水平及血清学指标。
