BACKGROUND The reparability of large or massive rotator cuff tears is difficult to determine preoperatively.We previously identified age≥65 years,acromiohumeral interval≤6 mm,and anteroposterior tear size≥22 mm as ...BACKGROUND The reparability of large or massive rotator cuff tears is difficult to determine preoperatively.We previously identified age≥65 years,acromiohumeral interval≤6 mm,and anteroposterior tear size≥22 mm as risk factors for rotator cuff repair failure.We therefore developed a rotator cuff reparability score where each of the above risk factors is assigned a score of one point.AIM To determine the accuracy of a rotator cuff reparability score.METHODS This was a retrospective cohort study of recruited patients with large or massive rotator cuff tears treated at our institution between January 2013 and December 2019.Exclusion criteria were revision surgery and patients with contraindications for surgery.All patients underwent arthroscopic rotator cuff repair and were categorized into either complete or partial rotator cuff repair.Rotator cuff reparability scores were calculated for each patient.The sensitivity,specificity,positive and negative predictive value,and positive and negative likelihood ratio were assessed.A receiver operating characteristic curve was plotted to determine the optimal cut-off rotator cuff reparability score.RESULTS Eighty patients(mean age,61 years;range,25–84 years;41 females and 39 males)were recruited.Intra-and inter-observer reliabilities were good to excellent.The number of patients with 0,1,2,and 3 risk factors for rotator cuff repair failure were 24,33,17,and 6,respectively.Complete repair was performed in all patients without risk factors.Two of the 33 patients with one risk factor and seven of the 17 patients with two risk factors underwent partial repair.One of the six patients with three risk factors underwent complete repair.The area under the curve was 0.894.The optimal cut-off score was two points with a sensitivity of 85.71%and a specificity of 83.33%.CONCLUSION A rotator cuff reparability score of two was determined to be the optimal cut-off score for predicting the reparability of large or massive rotator cuff tears.展开更多
In the face of harsh natural environment applications such as earth-orbiting and deep space satellites, underwater sea vehicles, strong electromagnetic interference and temperature stress,the circuits faults appear ea...In the face of harsh natural environment applications such as earth-orbiting and deep space satellites, underwater sea vehicles, strong electromagnetic interference and temperature stress,the circuits faults appear easily. Circuit faults will inevitably lead to serious losses of availability or impeded mission success without self-repair over the mission duration. Traditional fault-repair methods based on redundant fault-tolerant technique are straightforward to implement, yet their area, power and weight cost can be excessive. Moreover they utilize all plug-in or component level circuits to realize redundant backup, such that their applicability is limited. Hence, a novel selfrepair technology based on evolvable hardware（EHW） and reparation balance technology（RBT） is proposed. Its cost is low, and fault self-repair of various circuits and devices can be realized through dynamic configuration. Making full use of the fault signals, correcting circuit can be found through EHW technique to realize the balance and compensation of the fault output-signals. In this paper, the self-repair model was analyzed which based on EHW and RBT technique, the specific self-repair strategy was studied, the corresponding self-repair circuit fault system was designed, and the typical faults were simulated and analyzed which combined with the actual electronic devices. Simulation results demonstrated that the proposed fault self-repair strategy was feasible. Compared to traditional techniques, fault self-repair based on EHW consumes fewer hardware resources, and the scope of fault self-repair was expanded significantly.展开更多
Coal-fired electricity enterprises are caught in the dilemma of relative fixed prices and rising costs under the scenario of decarbonization.Meanwhile,soaring market-oriented coal pricing results in coal enterprises’...Coal-fired electricity enterprises are caught in the dilemma of relative fixed prices and rising costs under the scenario of decarbonization.Meanwhile,soaring market-oriented coal pricing results in coal enterprises’increasing defaults on thermal coal medium-and long-term contracts(MLC).To investigate the implementation of MLC at the micro-level,this study formalized the contractual behaviors of coal and coal-fired electricity enterprises based on the asymmetric evolutionary game.We formalized the evolving behaviors of both parties using replicator dynamics equations and proved that there were two evolutionary stabilization strategies(ESSs):compliance and coal enterprises’unilateral default.A multi-agent-based simulation was applied to verify the evolving process of ESSs and determine the critical values of MLC design by sensitive analysis.From the simulation results,coal-fired electricity enterprises do not stop generation under the current carbon quota allocation mechanism,even if carbon emission trading increases electricity generation costs.Coal enterprises choose to“default”when the market price of coal is higher than the contracted price by 18%.However,if the original reparation is increased by 5%,the compliance rate of the coal enterprises improves.Dynamic reparations embedded in the MLC improved enforcement during the contracting period.Moreover,the proposed policy implications have practical significance for enhancing the coordinated operation of coal-electricity energy supply chains.展开更多
Cancer is one of the leading causes of death in the world while the long-term prognosis is still unfavorable, despite the enormous efforts in the search for effective anti-cancer drugs. We think that the obstacle for ...Cancer is one of the leading causes of death in the world while the long-term prognosis is still unfavorable, despite the enormous efforts in the search for effective anti-cancer drugs. We think that the obstacle for creating of effective anti-cancer drugs could be existing idea that the basis of cancer is caused by the damage of the genetic apparatus of the cell. In this paper, we present the pathogenesis of cancer which is based on the formation of the special sustainable pathophysiological state of the organism what we call the state of “cancer reparative trap”. The essence of this pathophysiological state of the organism is in the reparative orientation of the immune system of cancer patients, when constant tissue repair is accompanied by systemic suppression of the anti-tumor immunity. Specifically, during the long-term exposure to carcinogens (exogenous and/or endogenous), the continuous tissue damage occurs which induces permanent stimulation of cell proliferation (imbalanced Th1 < Th2 lymphocytes, M1 < M2 macrophages, inflammation, angiogenesis, etc.) in order to repair the tissues damaged. At the same time, tissue repair is necessarily accompanied by the suppression of anti-tumor immunity (increase in T-regulatory cells, imbalanced Th1 Th2 lymphocytes, M1 < M2 macrophages et al.), which creates the necessary conditions for the survival of the malignantly transformed cells, formed by the action of carcinogens. The determining role of the imbalance in the autonomous nervous system (simpathetic/hypersympathetic dominance) in the development, maintenance and generalization of the cancer process has been shown. The explanation of a number of phenomena has been presented: the cell resistance to chemotherapy, and the phenomenon of cancer cell dormancy. The promising approaches for the cancer management in clinical practice have been proposed.展开更多
Giant cell reparative granuloma (GCRG) is a rare, benign tumour that mostly involves the maxilla and mandible. It is rare in the nasal cavity and paranasal sinuses. Here we report a case of GCRG of nasal cavity in 24-...Giant cell reparative granuloma (GCRG) is a rare, benign tumour that mostly involves the maxilla and mandible. It is rare in the nasal cavity and paranasal sinuses. Here we report a case of GCRG of nasal cavity in 24-year-old man who came with unilateral nasal obstruction, epistaxis and proptosis. CT scan showed soft tissue hypodensity lesion of left nasal cavity. Endoscopic surgical excision and biopsy were done. The pathology was consistent with GCRG. There was no recurrence seen on follow-up for 2 years. A short literature review about diagnosis, clinical behavior, radiological findings and treatment of this tumor entity are given.展开更多
Reduction of graphene oxide （GO） is a promising low-cost synthetic approach to bulk graphene, which offers an accessible route to transparent conducting films and flexible electronics. Unfortunately, the release of ...Reduction of graphene oxide （GO） is a promising low-cost synthetic approach to bulk graphene, which offers an accessible route to transparent conducting films and flexible electronics. Unfortunately, the release of oxygen-containing functional groups inevitably leaves behind vacancies and topological defects on the reduced GO sheet, and its low electrical conductivity hinders the development of practical applications. Here, we present a strategy for real-time repair of the newborn vacancies with carbon radicals produced by thermal decomposition of a suitable precursor. The sheet conductivity of thus-obtained single-layer graphene was raised more than six-fold to 350-410 S/cm （whilst retaining 〉96% transparency）. X-ray photoelectron spectroscopy （XPS） and Raman spectroscopy revealed that the conductivity enhancement can be attributed to the formation of additional sp2-C structures. This method provides a simple and efficient process for obtaining highly conductive transparent graphene films.展开更多
In this paper, we give a reliability anlysis of some queueing modesl with reparable service station. By using the method of supplementary variable,we obtained some system characters and reliability indices of the ser...In this paper, we give a reliability anlysis of some queueing modesl with reparable service station. By using the method of supplementary variable,we obtained some system characters and reliability indices of the service station.展开更多
针对配电系统多时刻量测缺失数据修复因误差累积导致准确率降低的问题,提出了一种基于多步长长短期记忆神经网络(multi-step long-short term memory,MLSTM)和协方差交叉(covariance intersection,CI)融合的配电系统多时刻量测缺失数据...针对配电系统多时刻量测缺失数据修复因误差累积导致准确率降低的问题,提出了一种基于多步长长短期记忆神经网络(multi-step long-short term memory,MLSTM)和协方差交叉(covariance intersection,CI)融合的配电系统多时刻量测缺失数据修复方法。首先,将配电系统电流、功率等量测量历史数据降维后,构建不同维度的输入向量矩阵和特征标签矩阵作为模型输入,并训练得到多个不同步长的长短期记忆神经网络(long-short term memory,LSTM)量测数据修复模型。在此基础上,利用CI算法对上述不同步长的LSTM修复模型进行融合,得到多时刻量测缺失数据修复模型。算例分析表明,所提方法可以有效抑制多时刻量测数据修复过程中的误差累积,提高多时刻缺失数据的修复准确度。展开更多
目的探讨iRoot BP Plus、MTA直接盖髓术后牙髓修复反应变化的异同。方法将36只大鼠随机分为3组,即iRoot BP Plus组、MTA组及空白对照组。对每只大鼠上颌左右第一磨牙进行开髓并行直接盖髓术。术后7、14、28 d于每组中随机选择4只大鼠处...目的探讨iRoot BP Plus、MTA直接盖髓术后牙髓修复反应变化的异同。方法将36只大鼠随机分为3组,即iRoot BP Plus组、MTA组及空白对照组。对每只大鼠上颌左右第一磨牙进行开髓并行直接盖髓术。术后7、14、28 d于每组中随机选择4只大鼠处死、取标本,行苏木精-伊红(hematoxylin-eosin staing,HE)染色,并观察各指标。结果①从牙本质小管形成质量来看,14、28 d时,iRoot BP Plus组与MTA组比较均具有统计学差异(P<0.05),且iRoot BP Plus在修复性牙本质形成质量方面明显优于MTA。②从修复性牙本质新生面积比值来看,术后14 d,iRoot BP Plus组较MTA组高(P<0.05)。结论iRoot BP Plus、MTA直接盖髓术后均可促进修复性牙本质桥的形成,且形成质量较高,远期效果有待进一步研究。展开更多
文摘BACKGROUND The reparability of large or massive rotator cuff tears is difficult to determine preoperatively.We previously identified age≥65 years,acromiohumeral interval≤6 mm,and anteroposterior tear size≥22 mm as risk factors for rotator cuff repair failure.We therefore developed a rotator cuff reparability score where each of the above risk factors is assigned a score of one point.AIM To determine the accuracy of a rotator cuff reparability score.METHODS This was a retrospective cohort study of recruited patients with large or massive rotator cuff tears treated at our institution between January 2013 and December 2019.Exclusion criteria were revision surgery and patients with contraindications for surgery.All patients underwent arthroscopic rotator cuff repair and were categorized into either complete or partial rotator cuff repair.Rotator cuff reparability scores were calculated for each patient.The sensitivity,specificity,positive and negative predictive value,and positive and negative likelihood ratio were assessed.A receiver operating characteristic curve was plotted to determine the optimal cut-off rotator cuff reparability score.RESULTS Eighty patients(mean age,61 years;range,25–84 years;41 females and 39 males)were recruited.Intra-and inter-observer reliabilities were good to excellent.The number of patients with 0,1,2,and 3 risk factors for rotator cuff repair failure were 24,33,17,and 6,respectively.Complete repair was performed in all patients without risk factors.Two of the 33 patients with one risk factor and seven of the 17 patients with two risk factors underwent partial repair.One of the six patients with three risk factors underwent complete repair.The area under the curve was 0.894.The optimal cut-off score was two points with a sensitivity of 85.71%and a specificity of 83.33%.CONCLUSION A rotator cuff reparability score of two was determined to be the optimal cut-off score for predicting the reparability of large or massive rotator cuff tears.
基金supported by the National Natural Science Foundation of China (Nos. 61271153, 61372039)
文摘In the face of harsh natural environment applications such as earth-orbiting and deep space satellites, underwater sea vehicles, strong electromagnetic interference and temperature stress,the circuits faults appear easily. Circuit faults will inevitably lead to serious losses of availability or impeded mission success without self-repair over the mission duration. Traditional fault-repair methods based on redundant fault-tolerant technique are straightforward to implement, yet their area, power and weight cost can be excessive. Moreover they utilize all plug-in or component level circuits to realize redundant backup, such that their applicability is limited. Hence, a novel selfrepair technology based on evolvable hardware（EHW） and reparation balance technology（RBT） is proposed. Its cost is low, and fault self-repair of various circuits and devices can be realized through dynamic configuration. Making full use of the fault signals, correcting circuit can be found through EHW technique to realize the balance and compensation of the fault output-signals. In this paper, the self-repair model was analyzed which based on EHW and RBT technique, the specific self-repair strategy was studied, the corresponding self-repair circuit fault system was designed, and the typical faults were simulated and analyzed which combined with the actual electronic devices. Simulation results demonstrated that the proposed fault self-repair strategy was feasible. Compared to traditional techniques, fault self-repair based on EHW consumes fewer hardware resources, and the scope of fault self-repair was expanded significantly.
基金supported by the Fund of Education Ministry Humanity and Society (No. 18YJCZH016)
文摘Coal-fired electricity enterprises are caught in the dilemma of relative fixed prices and rising costs under the scenario of decarbonization.Meanwhile,soaring market-oriented coal pricing results in coal enterprises’increasing defaults on thermal coal medium-and long-term contracts(MLC).To investigate the implementation of MLC at the micro-level,this study formalized the contractual behaviors of coal and coal-fired electricity enterprises based on the asymmetric evolutionary game.We formalized the evolving behaviors of both parties using replicator dynamics equations and proved that there were two evolutionary stabilization strategies(ESSs):compliance and coal enterprises’unilateral default.A multi-agent-based simulation was applied to verify the evolving process of ESSs and determine the critical values of MLC design by sensitive analysis.From the simulation results,coal-fired electricity enterprises do not stop generation under the current carbon quota allocation mechanism,even if carbon emission trading increases electricity generation costs.Coal enterprises choose to“default”when the market price of coal is higher than the contracted price by 18%.However,if the original reparation is increased by 5%,the compliance rate of the coal enterprises improves.Dynamic reparations embedded in the MLC improved enforcement during the contracting period.Moreover,the proposed policy implications have practical significance for enhancing the coordinated operation of coal-electricity energy supply chains.
文摘Cancer is one of the leading causes of death in the world while the long-term prognosis is still unfavorable, despite the enormous efforts in the search for effective anti-cancer drugs. We think that the obstacle for creating of effective anti-cancer drugs could be existing idea that the basis of cancer is caused by the damage of the genetic apparatus of the cell. In this paper, we present the pathogenesis of cancer which is based on the formation of the special sustainable pathophysiological state of the organism what we call the state of “cancer reparative trap”. The essence of this pathophysiological state of the organism is in the reparative orientation of the immune system of cancer patients, when constant tissue repair is accompanied by systemic suppression of the anti-tumor immunity. Specifically, during the long-term exposure to carcinogens (exogenous and/or endogenous), the continuous tissue damage occurs which induces permanent stimulation of cell proliferation (imbalanced Th1 < Th2 lymphocytes, M1 < M2 macrophages, inflammation, angiogenesis, etc.) in order to repair the tissues damaged. At the same time, tissue repair is necessarily accompanied by the suppression of anti-tumor immunity (increase in T-regulatory cells, imbalanced Th1 Th2 lymphocytes, M1 < M2 macrophages et al.), which creates the necessary conditions for the survival of the malignantly transformed cells, formed by the action of carcinogens. The determining role of the imbalance in the autonomous nervous system (simpathetic/hypersympathetic dominance) in the development, maintenance and generalization of the cancer process has been shown. The explanation of a number of phenomena has been presented: the cell resistance to chemotherapy, and the phenomenon of cancer cell dormancy. The promising approaches for the cancer management in clinical practice have been proposed.
文摘Giant cell reparative granuloma (GCRG) is a rare, benign tumour that mostly involves the maxilla and mandible. It is rare in the nasal cavity and paranasal sinuses. Here we report a case of GCRG of nasal cavity in 24-year-old man who came with unilateral nasal obstruction, epistaxis and proptosis. CT scan showed soft tissue hypodensity lesion of left nasal cavity. Endoscopic surgical excision and biopsy were done. The pathology was consistent with GCRG. There was no recurrence seen on follow-up for 2 years. A short literature review about diagnosis, clinical behavior, radiological findings and treatment of this tumor entity are given.
基金This work was supported by the National Natural Science Foundation of China （Grants Nos. 50802003, 20973013, 51072004, 50821061, and 20973006） and Ministry of Science and Technology of the people＇s Republic of China （Grants Nos. 2007CB936203, 2006CBP32602, and 2009CB929403）.
文摘Reduction of graphene oxide （GO） is a promising low-cost synthetic approach to bulk graphene, which offers an accessible route to transparent conducting films and flexible electronics. Unfortunately, the release of oxygen-containing functional groups inevitably leaves behind vacancies and topological defects on the reduced GO sheet, and its low electrical conductivity hinders the development of practical applications. Here, we present a strategy for real-time repair of the newborn vacancies with carbon radicals produced by thermal decomposition of a suitable precursor. The sheet conductivity of thus-obtained single-layer graphene was raised more than six-fold to 350-410 S/cm （whilst retaining 〉96% transparency）. X-ray photoelectron spectroscopy （XPS） and Raman spectroscopy revealed that the conductivity enhancement can be attributed to the formation of additional sp2-C structures. This method provides a simple and efficient process for obtaining highly conductive transparent graphene films.
文摘In this paper, we give a reliability anlysis of some queueing modesl with reparable service station. By using the method of supplementary variable,we obtained some system characters and reliability indices of the service station.
文摘针对配电系统多时刻量测缺失数据修复因误差累积导致准确率降低的问题,提出了一种基于多步长长短期记忆神经网络(multi-step long-short term memory,MLSTM)和协方差交叉(covariance intersection,CI)融合的配电系统多时刻量测缺失数据修复方法。首先,将配电系统电流、功率等量测量历史数据降维后,构建不同维度的输入向量矩阵和特征标签矩阵作为模型输入,并训练得到多个不同步长的长短期记忆神经网络(long-short term memory,LSTM)量测数据修复模型。在此基础上,利用CI算法对上述不同步长的LSTM修复模型进行融合,得到多时刻量测缺失数据修复模型。算例分析表明,所提方法可以有效抑制多时刻量测数据修复过程中的误差累积,提高多时刻缺失数据的修复准确度。
文摘目的探讨iRoot BP Plus、MTA直接盖髓术后牙髓修复反应变化的异同。方法将36只大鼠随机分为3组,即iRoot BP Plus组、MTA组及空白对照组。对每只大鼠上颌左右第一磨牙进行开髓并行直接盖髓术。术后7、14、28 d于每组中随机选择4只大鼠处死、取标本,行苏木精-伊红(hematoxylin-eosin staing,HE)染色,并观察各指标。结果①从牙本质小管形成质量来看,14、28 d时,iRoot BP Plus组与MTA组比较均具有统计学差异(P<0.05),且iRoot BP Plus在修复性牙本质形成质量方面明显优于MTA。②从修复性牙本质新生面积比值来看,术后14 d,iRoot BP Plus组较MTA组高(P<0.05)。结论iRoot BP Plus、MTA直接盖髓术后均可促进修复性牙本质桥的形成,且形成质量较高,远期效果有待进一步研究。
