相较于传统车载充电系统,集成型车载充电系统(integrated onboard charger system,IOCS)在成本、功率密度等方面具备显著优势。文中基于六相永磁电驱系统设计了一台IOCS,并研究了模型预测电流控制(model predictive current control,MP...相较于传统车载充电系统,集成型车载充电系统(integrated onboard charger system,IOCS)在成本、功率密度等方面具备显著优势。文中基于六相永磁电驱系统设计了一台IOCS,并研究了模型预测电流控制(model predictive current control,MPCC)算法在该系统并网模式下的应用。首先,分析所提IOCS的电路拓扑并建立数学模型,同时介绍传统MPCC的实施流程。然后,针对传统MPCC计算量大、稳态性能差等不足,提出一种基于占空比优化的MPCC(MPCC based on duty cycle optimization,DCO-MPCC)策略。一方面,减少备选电压矢量数量,降低电流预测环节带来的计算负担;另一方面,提出一种占空比优化技术,改善系统稳态性能。最后,通过实验验证了所提算法的有效性与优越性。实验结果表明,DCO-MPCC策略能够显著提升系统稳态性能并减少算法计算量。充电与车网互动(vehicle to grid,V2G)工况下,网侧电流总谐波畸变(total harmonic distortion,THD)分别降低6.18%与5.92%,算法运行时间减少17.54μs。展开更多
Sponsored by college of chemistry and molecular engineering, Peking University and Thermo Fisher Scientific, The Asian Regional Conference on 2DCOS (2DCOS-2014) was held (19, April, 2014 - 20, April, 2014) at the ...Sponsored by college of chemistry and molecular engineering, Peking University and Thermo Fisher Scientific, The Asian Regional Conference on 2DCOS (2DCOS-2014) was held (19, April, 2014 - 20, April, 2014) at the beautiful campus of Peking University. Prof. lsao Noda,展开更多
An 80-GHz DCO based on modified hybrid tuning banks is introduced in this paper.To achieve sub-MHz frequency res-olution with reduced circuit complexity,the improved circuit topology replaces the conventional circuit ...An 80-GHz DCO based on modified hybrid tuning banks is introduced in this paper.To achieve sub-MHz frequency res-olution with reduced circuit complexity,the improved circuit topology replaces the conventional circuit topology with two binary-weighted SC cells,enabling eight SC-cell-based improved SC ladders to achieve the same fine-tuning steps as twelve SC-cell-based conventional SC ladders.To achieve lower phase noise and smaller chip size,the promoted binary-weighted digi-tally controlled transmission lines(DCTLs)are used to implement the coarse and medium tuning banks of the DCO.Compared to the conventional thermometer-coded DCTLs,control bits of the proposed DCTLs are reduced from 30 to 8,and the total length is reduced by 34.3%(from 122.76 to 80.66μm).Fabricated in 40-nm CMOS,the DCO demonstrated in this work fea-tures a small fine-tuning step(483 kHz),a high oscillation frequency(79-85 GHz),and a smaller chip size(0.017 mm^(2)).Com-pared to previous work,the modified DCO exhibits an excellent figure of merit with an area(FoMA)of-198 dBc/Hz.展开更多
目的:探讨损伤控制骨科(damage control orthopaedics DCO)理论在儿童严重骨盆骨折救治中的应用。方法:按是否遵循DCO策略将本院自2001年1月-2013年6月收治的32例儿童严重骨盆骨折分为2组,对照组为前期未按DCO原则治疗的14例患者...目的:探讨损伤控制骨科(damage control orthopaedics DCO)理论在儿童严重骨盆骨折救治中的应用。方法:按是否遵循DCO策略将本院自2001年1月-2013年6月收治的32例儿童严重骨盆骨折分为2组,对照组为前期未按DCO原则治疗的14例患者,观察组为后期采用DCO方法治疗的18例患者,总结DCO策略方法及临床效果。结果:观察组15例患者存活,3例死亡,其中1例死于失血性休克,2例死于多器官功能衰竭,远期Cole疗效评分为36.7分。对照组9例患者存活,5例死亡,3例死于失血性休克,其中1例死于弥漫性血管内凝血,1例死于严重感染,远期Cole疗效评分为30.6分,2组患者在死亡率、远期疗效方面差异均有统计学意义(P〈0.05)。结论:将DCO技术干预和骨科专科医生的早期介入提前到事故现场和急诊室阶段,并应用于儿童严重骨盆骨折的临床治疗,强调院前急救和院内处理并重,有利于对患儿进行迅速、有效、旨在抢救生命的整体治疗,能显著提高患儿的生存率,减少并发症的发生。展开更多
以我国自主创新的CAPS(China area positioning system)导航定位系统为研究平台,提出了CAPS卫星信号模拟器的系统架构,给出了总体设计框图,对各模块的功能进行了划分和设计。针对CAPS导航系统的特点,开展了模拟器关键技术的研究,给出了...以我国自主创新的CAPS(China area positioning system)导航定位系统为研究平台,提出了CAPS卫星信号模拟器的系统架构,给出了总体设计框图,对各模块的功能进行了划分和设计。针对CAPS导航系统的特点,开展了模拟器关键技术的研究,给出了相关参数的计算方法。利用已开发出的成型的CAPS模拟器进行测试,结果表明:本文的设计方法是可行的,该模拟器可以用于测试接收机的捕获、跟踪和定位性能等。展开更多
损伤控制原则正在逐步进入到创伤骨科领域,近年来损伤控制骨科理念(damage control orthopaedics,DCO)的提出是创伤救治领域的一个重要进展,在危重创伤病人的救治中已经呈现出显著优势并得到关注。本文就损伤控制骨科理念在创伤骨科领...损伤控制原则正在逐步进入到创伤骨科领域,近年来损伤控制骨科理念(damage control orthopaedics,DCO)的提出是创伤救治领域的一个重要进展,在危重创伤病人的救治中已经呈现出显著优势并得到关注。本文就损伤控制骨科理念在创伤骨科领域中的应用作简要综述。展开更多
A number of useful techniques associated with two-dimensional correlation spectroscopy(2DCOS)to improve its performance and utility have been developed in the last 30years.Evolution of these 2DCOS techniques,including...A number of useful techniques associated with two-dimensional correlation spectroscopy(2DCOS)to improve its performance and utility have been developed in the last 30years.Evolution of these 2DCOS techniques,including some of the very recent developments,is reviewed with examples.Topics include merged or modified asynchronous 2Dcorrelation spectrum,two-dimensional codistribution spectroscopy(2DCDS),Pareto scaling,and null-space projection treatment of spectral dataset.展开更多
目的探讨内镜逆行胰胆管造影(ERCP)及经皮肝穿刺胆道引流(PTCD)在急诊抢救急性梗阻性化脓性胆管炎(AOSC)患者生命,解决胆道梗阻及感染效果选择。方法笔者回顾性分析广西医科大学第一附属医院(2011-2013年)67例确诊为因胆总管下段结石梗...目的探讨内镜逆行胰胆管造影(ERCP)及经皮肝穿刺胆道引流(PTCD)在急诊抢救急性梗阻性化脓性胆管炎(AOSC)患者生命,解决胆道梗阻及感染效果选择。方法笔者回顾性分析广西医科大学第一附属医院(2011-2013年)67例确诊为因胆总管下段结石梗阻诱发急性重症胆管炎患者,两组患者术前基础情况差异无统计学意义,急诊分别采用ERCP、PTCD治疗,进行术中麻醉、手术创伤及术后恢复情况比较。结果 PTCD手术耐受性更好,引流效果更确切,ERCP则在微创的前提下提供了解决结石梗阻的方案。结论具体病例应按照损伤控制性手术(Damage control op-eration,DCO)原则与理念进行分析与选择。展开更多
文摘相较于传统车载充电系统,集成型车载充电系统(integrated onboard charger system,IOCS)在成本、功率密度等方面具备显著优势。文中基于六相永磁电驱系统设计了一台IOCS,并研究了模型预测电流控制(model predictive current control,MPCC)算法在该系统并网模式下的应用。首先,分析所提IOCS的电路拓扑并建立数学模型,同时介绍传统MPCC的实施流程。然后,针对传统MPCC计算量大、稳态性能差等不足,提出一种基于占空比优化的MPCC(MPCC based on duty cycle optimization,DCO-MPCC)策略。一方面,减少备选电压矢量数量,降低电流预测环节带来的计算负担;另一方面,提出一种占空比优化技术,改善系统稳态性能。最后,通过实验验证了所提算法的有效性与优越性。实验结果表明,DCO-MPCC策略能够显著提升系统稳态性能并减少算法计算量。充电与车网互动(vehicle to grid,V2G)工况下,网侧电流总谐波畸变(total harmonic distortion,THD)分别降低6.18%与5.92%,算法运行时间减少17.54μs。
文摘Sponsored by college of chemistry and molecular engineering, Peking University and Thermo Fisher Scientific, The Asian Regional Conference on 2DCOS (2DCOS-2014) was held (19, April, 2014 - 20, April, 2014) at the beautiful campus of Peking University. Prof. lsao Noda,
基金This work is supported by the National Natural Science Foundation of China(No.61674036)the National Key Research and Development Program of China(No.2018YFB2202200).
文摘An 80-GHz DCO based on modified hybrid tuning banks is introduced in this paper.To achieve sub-MHz frequency res-olution with reduced circuit complexity,the improved circuit topology replaces the conventional circuit topology with two binary-weighted SC cells,enabling eight SC-cell-based improved SC ladders to achieve the same fine-tuning steps as twelve SC-cell-based conventional SC ladders.To achieve lower phase noise and smaller chip size,the promoted binary-weighted digi-tally controlled transmission lines(DCTLs)are used to implement the coarse and medium tuning banks of the DCO.Compared to the conventional thermometer-coded DCTLs,control bits of the proposed DCTLs are reduced from 30 to 8,and the total length is reduced by 34.3%(from 122.76 to 80.66μm).Fabricated in 40-nm CMOS,the DCO demonstrated in this work fea-tures a small fine-tuning step(483 kHz),a high oscillation frequency(79-85 GHz),and a smaller chip size(0.017 mm^(2)).Com-pared to previous work,the modified DCO exhibits an excellent figure of merit with an area(FoMA)of-198 dBc/Hz.
文摘目的:探讨损伤控制骨科(damage control orthopaedics DCO)理论在儿童严重骨盆骨折救治中的应用。方法:按是否遵循DCO策略将本院自2001年1月-2013年6月收治的32例儿童严重骨盆骨折分为2组,对照组为前期未按DCO原则治疗的14例患者,观察组为后期采用DCO方法治疗的18例患者,总结DCO策略方法及临床效果。结果:观察组15例患者存活,3例死亡,其中1例死于失血性休克,2例死于多器官功能衰竭,远期Cole疗效评分为36.7分。对照组9例患者存活,5例死亡,3例死于失血性休克,其中1例死于弥漫性血管内凝血,1例死于严重感染,远期Cole疗效评分为30.6分,2组患者在死亡率、远期疗效方面差异均有统计学意义(P〈0.05)。结论:将DCO技术干预和骨科专科医生的早期介入提前到事故现场和急诊室阶段,并应用于儿童严重骨盆骨折的临床治疗,强调院前急救和院内处理并重,有利于对患儿进行迅速、有效、旨在抢救生命的整体治疗,能显著提高患儿的生存率,减少并发症的发生。
文摘以我国自主创新的CAPS(China area positioning system)导航定位系统为研究平台,提出了CAPS卫星信号模拟器的系统架构,给出了总体设计框图,对各模块的功能进行了划分和设计。针对CAPS导航系统的特点,开展了模拟器关键技术的研究,给出了相关参数的计算方法。利用已开发出的成型的CAPS模拟器进行测试,结果表明:本文的设计方法是可行的,该模拟器可以用于测试接收机的捕获、跟踪和定位性能等。
文摘A number of useful techniques associated with two-dimensional correlation spectroscopy(2DCOS)to improve its performance and utility have been developed in the last 30years.Evolution of these 2DCOS techniques,including some of the very recent developments,is reviewed with examples.Topics include merged or modified asynchronous 2Dcorrelation spectrum,two-dimensional codistribution spectroscopy(2DCDS),Pareto scaling,and null-space projection treatment of spectral dataset.
文摘目的探讨内镜逆行胰胆管造影(ERCP)及经皮肝穿刺胆道引流(PTCD)在急诊抢救急性梗阻性化脓性胆管炎(AOSC)患者生命,解决胆道梗阻及感染效果选择。方法笔者回顾性分析广西医科大学第一附属医院(2011-2013年)67例确诊为因胆总管下段结石梗阻诱发急性重症胆管炎患者,两组患者术前基础情况差异无统计学意义,急诊分别采用ERCP、PTCD治疗,进行术中麻醉、手术创伤及术后恢复情况比较。结果 PTCD手术耐受性更好,引流效果更确切,ERCP则在微创的前提下提供了解决结石梗阻的方案。结论具体病例应按照损伤控制性手术(Damage control op-eration,DCO)原则与理念进行分析与选择。