Laboratory experiments were conducted to investigate the mixture of wastewater discharged from a submerged multiport diffuser in the Nantong sea-area. The process was then simulated with a three-dimensional numerical ...Laboratory experiments were conducted to investigate the mixture of wastewater discharged from a submerged multiport diffuser in the Nantong sea-area. The process was then simulated with a three-dimensional numerical model. The plane or line patch was used to impose the discharge momentum flux in the near field. A comparison of model simulation with laboratory experiments shows that the proposed model can be used to simulate the shapes of pollution plumes, the distributions of excess concentration, and the velocity induced by a coflowing diffuser in proximity to a shoreline boundary. From the numerical simulation and laboratory experiments, it is recommended that the multiport diffuser be placed in a hydrodynamically active sea-area.展开更多
Equivalent two-port measurement equations for reciprocal n-port network are de-rived.As an example,applications of these equations,measurement details and data-processingmethods are discussed for any three-port networ...Equivalent two-port measurement equations for reciprocal n-port network are de-rived.As an example,applications of these equations,measurement details and data-processingmethods are discussed for any three-port network.To realize rapid and automatic measure-ments of S-parameters of any reciprocal multiport network,a set of measurement system whichis composed of auto-slotted line and program controlled movable shorts is presented in this paper.Experimental data are given for an H-plane Tee three-port network.展开更多
Multiport diffusers are the effective engineering devices installed at the marine outfall systems for the steady discharge of effluent streams from the modern coastal plants, such as municipal sewage treatment, power ...Multiport diffusers are the effective engineering devices installed at the marine outfall systems for the steady discharge of effluent streams from the modern coastal plants, such as municipal sewage treatment, power generation and seawater desalination. A far field mathematical model using a two-dimensional advection-diffusion equation is presented for continuous discharges of effluent streams from multiple outfalls on a uniformly sloping beach with a current parallel to the shoreline. The analytical solutions are illustrated graphically to replicate and capture the merging process of effluent plumes in shallow coastal waters, and then asymptotic approximation will be made to the maximum shoreline’s concentration to formulate effluent discharge plume dilution from a multiport diffuser.展开更多
We study entangling and disentangling functions of optical Fourier multiport devices in which input-output relation for the creation and annihilation operators is given by a finite Fourier transform. It is shown that ...We study entangling and disentangling functions of optical Fourier multiport devices in which input-output relation for the creation and annihilation operators is given by a finite Fourier transform. It is shown that these Fourier multiport devices can act as entanglement converters which can not only create entanglement from an unentangled state at the input but also destroy entanglement in an entangled state at the input. Creation and destruction of two-mode and three-mode entangled coherent states （ECSs） are investigated in detail. The creation and destruction of Bell-type two-mode ECS, GHZ-type and W-type three-mode ECSs are indicated explicitly through using Fourier four-port and six-port devices, respectively.展开更多
Single incision laparoscopic liver resection(SILLR)is the most recent develop-ment in the laparoscopic approach to the liver.SILLR for hepatocellular carci-noma(HCC)has developed much more slowly than multiport LLR.So...Single incision laparoscopic liver resection(SILLR)is the most recent develop-ment in the laparoscopic approach to the liver.SILLR for hepatocellular carci-noma(HCC)has developed much more slowly than multiport LLR.So far,195 patients completed SILLR for HCC.In this paper,we reviewed all published papers about SILLR for HCC and discussed the feasibility of the SILLR,peri and postoperative findings,tricks of patient selection and whether SILLR compromise the oncological principles.展开更多
To evaluate the impact of the randomness and correlation of photovoltaic(PV)and load on AC/DC systems with a multiport current flow controller(M-CFC),this paper proposes a probabilistic optimal power flow calculation ...To evaluate the impact of the randomness and correlation of photovoltaic(PV)and load on AC/DC systems with a multiport current flow controller(M-CFC),this paper proposes a probabilistic optimal power flow calculation for AC/DC systems,based on a nonparametric kernel density estimation.First,according to the M-CFC model,the DC power flow calculation method with M-CFC was inferred,and its influence on line loss was analyzed.Second,a nonparametric kernel density estimation with an adaptive bandwidth is used to accurately describe the probability distribution of the PV and load,and correlation samples of the PV and load are obtained by the mixed copula function.Then an optimization model that considers system loss and static security is established,and a fast nondominated sorting genetic algorithm based on the elite strategy(NSGA-II)is used to calculate the multi-objective probability optimal power flow of the AC/DC system.Finally,a case study is performed on a modified IEEE39 bus system using measured PV and load data.We verified that the nonparametric kernel density estimation with an adaptive bandwidth can better adapt to random component uncertainty,and M-CFC can improve the static security of the system.展开更多
背景与目的肺癌术后3个月的生活质量在不同手术入路之间的关系尚不明确,本研究旨在对比单孔与多孔胸腔镜肺叶切除术后3个月患者的生活质量。方法收集2021年4月至2021年10月在四川省肿瘤医院胸外科行肺部手术患者的资料,采用欧洲癌症研...背景与目的肺癌术后3个月的生活质量在不同手术入路之间的关系尚不明确,本研究旨在对比单孔与多孔胸腔镜肺叶切除术后3个月患者的生活质量。方法收集2021年4月至2021年10月在四川省肿瘤医院胸外科行肺部手术患者的资料,采用欧洲癌症研究与治疗组织生活质量核心量表C30 (European Organization for Research and Treatment of Cancer quality of life core 30,EORTC QLQ-C30)和肺癌生活质量量表29 (Quality of Life QuestionnaireLung Cancer 29,QLQ-LC29)收集患者的生活质量资料。将基线资料中潜在混杂因素纳入多因素回归模型中校正,比较两组患者术后3个月的生活质量与传统临床结局。结果共纳入130例肺癌患者,男性57例(43.8%),女性73例(56.2%),平均年龄(57.1±9.5)岁。两组患者基线资料中,放置引流管数量具有统计学差异(P<0.001)。经回归模型校正后,在术后3个月时,两组患者全部症状及功能状态评分无明显差异(P均>0.05)。多孔组的手术时间(120.0 min vs 85.0 min,P=0.001)、术后住院时间(6.0 d vs 4.0 d,P=0.020)比单孔组更长,早期>2级并发症发生率(39.0%vs 10.1%,P=0.011)比单孔组更高。结论单孔与多孔胸腔镜肺叶切除术患者在术后3个月时具有相似的生活质量。单孔组在手术时间、术后住院时间及术后早期并发症等传统临床结局指标上可能具有一定的优势。展开更多
该文提出了一种多端口直流–直流自耦变压器的拓扑,该多端口直流自耦变压器用于互联多个直流电压等级不同的直流系统。提出了多端口直流自耦变压器的潮流直接分析法以及潮流分解分析法,推导了多端口直流自耦变压器中各换流器额定电压与...该文提出了一种多端口直流–直流自耦变压器的拓扑,该多端口直流自耦变压器用于互联多个直流电压等级不同的直流系统。提出了多端口直流自耦变压器的潮流直接分析法以及潮流分解分析法,推导了多端口直流自耦变压器中各换流器额定电压与额定功率设计方法,设计了多端口直流自耦变压器的控制策略。以一个三端口直流自耦变压器为测试算例,在PSCAD/EMTDC下仿真验证了多端口直流自耦变压器的技术可行性。以互联±250、±320 k V和±400 k V直流系统为例,假设±250 k V和±320 k V系统的额定输入/输出功率分别为500 MW和1 000 MW,采用常规的多端口直流–直流变换器技术所需要的换流器总容量为3 000 MW,而采用多端口直流自耦变压器技术所需要总的换流器仅为775 MW,所使用的换流器总容量仅为现有技术的26%,显著节省了成本,降低了运行损耗。展开更多
文摘Laboratory experiments were conducted to investigate the mixture of wastewater discharged from a submerged multiport diffuser in the Nantong sea-area. The process was then simulated with a three-dimensional numerical model. The plane or line patch was used to impose the discharge momentum flux in the near field. A comparison of model simulation with laboratory experiments shows that the proposed model can be used to simulate the shapes of pollution plumes, the distributions of excess concentration, and the velocity induced by a coflowing diffuser in proximity to a shoreline boundary. From the numerical simulation and laboratory experiments, it is recommended that the multiport diffuser be placed in a hydrodynamically active sea-area.
文摘Equivalent two-port measurement equations for reciprocal n-port network are de-rived.As an example,applications of these equations,measurement details and data-processingmethods are discussed for any three-port network.To realize rapid and automatic measure-ments of S-parameters of any reciprocal multiport network,a set of measurement system whichis composed of auto-slotted line and program controlled movable shorts is presented in this paper.Experimental data are given for an H-plane Tee three-port network.
文摘Multiport diffusers are the effective engineering devices installed at the marine outfall systems for the steady discharge of effluent streams from the modern coastal plants, such as municipal sewage treatment, power generation and seawater desalination. A far field mathematical model using a two-dimensional advection-diffusion equation is presented for continuous discharges of effluent streams from multiple outfalls on a uniformly sloping beach with a current parallel to the shoreline. The analytical solutions are illustrated graphically to replicate and capture the merging process of effluent plumes in shallow coastal waters, and then asymptotic approximation will be made to the maximum shoreline’s concentration to formulate effluent discharge plume dilution from a multiport diffuser.
基金Supported by National Natural Science Foundation of China under Grant Nos. 10325523 and 10775048the National Fundamental Research Program of China under Grant No. 2007CB925204the Key Project of Education Department of Hunan Province under Grant No. 08w012
文摘We study entangling and disentangling functions of optical Fourier multiport devices in which input-output relation for the creation and annihilation operators is given by a finite Fourier transform. It is shown that these Fourier multiport devices can act as entanglement converters which can not only create entanglement from an unentangled state at the input but also destroy entanglement in an entangled state at the input. Creation and destruction of two-mode and three-mode entangled coherent states （ECSs） are investigated in detail. The creation and destruction of Bell-type two-mode ECS, GHZ-type and W-type three-mode ECSs are indicated explicitly through using Fourier four-port and six-port devices, respectively.
文摘Single incision laparoscopic liver resection(SILLR)is the most recent develop-ment in the laparoscopic approach to the liver.SILLR for hepatocellular carci-noma(HCC)has developed much more slowly than multiport LLR.So far,195 patients completed SILLR for HCC.In this paper,we reviewed all published papers about SILLR for HCC and discussed the feasibility of the SILLR,peri and postoperative findings,tricks of patient selection and whether SILLR compromise the oncological principles.
基金supported by the National Natural Science Foundation of China(Grant No.51677023).
文摘To evaluate the impact of the randomness and correlation of photovoltaic(PV)and load on AC/DC systems with a multiport current flow controller(M-CFC),this paper proposes a probabilistic optimal power flow calculation for AC/DC systems,based on a nonparametric kernel density estimation.First,according to the M-CFC model,the DC power flow calculation method with M-CFC was inferred,and its influence on line loss was analyzed.Second,a nonparametric kernel density estimation with an adaptive bandwidth is used to accurately describe the probability distribution of the PV and load,and correlation samples of the PV and load are obtained by the mixed copula function.Then an optimization model that considers system loss and static security is established,and a fast nondominated sorting genetic algorithm based on the elite strategy(NSGA-II)is used to calculate the multi-objective probability optimal power flow of the AC/DC system.Finally,a case study is performed on a modified IEEE39 bus system using measured PV and load data.We verified that the nonparametric kernel density estimation with an adaptive bandwidth can better adapt to random component uncertainty,and M-CFC can improve the static security of the system.
文摘背景与目的肺癌术后3个月的生活质量在不同手术入路之间的关系尚不明确,本研究旨在对比单孔与多孔胸腔镜肺叶切除术后3个月患者的生活质量。方法收集2021年4月至2021年10月在四川省肿瘤医院胸外科行肺部手术患者的资料,采用欧洲癌症研究与治疗组织生活质量核心量表C30 (European Organization for Research and Treatment of Cancer quality of life core 30,EORTC QLQ-C30)和肺癌生活质量量表29 (Quality of Life QuestionnaireLung Cancer 29,QLQ-LC29)收集患者的生活质量资料。将基线资料中潜在混杂因素纳入多因素回归模型中校正,比较两组患者术后3个月的生活质量与传统临床结局。结果共纳入130例肺癌患者,男性57例(43.8%),女性73例(56.2%),平均年龄(57.1±9.5)岁。两组患者基线资料中,放置引流管数量具有统计学差异(P<0.001)。经回归模型校正后,在术后3个月时,两组患者全部症状及功能状态评分无明显差异(P均>0.05)。多孔组的手术时间(120.0 min vs 85.0 min,P=0.001)、术后住院时间(6.0 d vs 4.0 d,P=0.020)比单孔组更长,早期>2级并发症发生率(39.0%vs 10.1%,P=0.011)比单孔组更高。结论单孔与多孔胸腔镜肺叶切除术患者在术后3个月时具有相似的生活质量。单孔组在手术时间、术后住院时间及术后早期并发症等传统临床结局指标上可能具有一定的优势。
文摘该文提出了一种多端口直流–直流自耦变压器的拓扑,该多端口直流自耦变压器用于互联多个直流电压等级不同的直流系统。提出了多端口直流自耦变压器的潮流直接分析法以及潮流分解分析法,推导了多端口直流自耦变压器中各换流器额定电压与额定功率设计方法,设计了多端口直流自耦变压器的控制策略。以一个三端口直流自耦变压器为测试算例,在PSCAD/EMTDC下仿真验证了多端口直流自耦变压器的技术可行性。以互联±250、±320 k V和±400 k V直流系统为例,假设±250 k V和±320 k V系统的额定输入/输出功率分别为500 MW和1 000 MW,采用常规的多端口直流–直流变换器技术所需要的换流器总容量为3 000 MW,而采用多端口直流自耦变压器技术所需要总的换流器仅为775 MW,所使用的换流器总容量仅为现有技术的26%,显著节省了成本,降低了运行损耗。
