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The initial clinical investigation of flexible ureteroscopy combining with Cheng's sucking-sheath on treating renal stone >2cm

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The initial clinical investigation of flexible ureteroscopy ...

Renal and Proximal Ureteral Calculi:A Single-surgeon Experience of 382 Cases Running title:Modular Flexible Ureteroscopy for Treatment of Calculi

2019年浙江省医学会泌尿外科学、男科学学术大会

作者： Li Fang Yue Cheng guohai xie Ningbo First hospital

Objective Cheng’s sucking-sheath is a novel sheath adding a suction ending at the classic ureteral access sheath, it would reduce the inter-pelvic pressure, increase the irrigation flow rate and suck the fragments of stones out form the channel theoretically. The aim of this trial is to observe the efficiency and security of flexible ureteroscopy combining with Cheng’s sucking-sheath on treating renal stone>2cm.

关键词： The initial clinical investigation of flexible ureteroscopy combining with Cheng's sucking-sheath on treating renal stone

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Renal and Proximal Ureteral Calculi:A Single-surgeon Experie...

Mass extinctions, their causes and consequences: an interview with Douglas *** and Shuzhong Shen

2015年浙江省泌尿外科学男科学学术年会

作者： Yan Zejun xie guohai Fang Li Yuan Hesheng Cheng Yue Department of Urology Ningbo First HospitalMedical College of Ningbo University

Background:The fragility and expensive repair costs of flexible ureteroscope have tempered enthusiasm of both surgeons and institutions for widespread popularization of this ***,an inexpensive,small caliber,singleuse flexible ureteroscope with similar deflection capabilities of conventional integrated flexible ureteroscopes may be a cost-effective ***:To determine the safety and efficacy of modular flexible ureteroscopy and Holmium laser lithotripsy for the treatment of renal and proximal ureteral ***,setting,and participants:A retrospective chart review of a single surgeon’s 4-year modular flexible ureteroscopy experience was ***:All patients were treated with modular flexible ureteroscopy and Holmium laser ***:Stone-free status was defined as no fragments or a single fragment≤4 mm in diameter on standard radiograph and sonography at 3-month *** and Limitations:Our study included 215 male patients and 167 female patients with an average age of 48.5±13.7 yr(range 17-84 yr).The mean stone size was 11.5±4.1 mm(range:4-28 mm),and the mean total stone burden was 17.5±5.7 mm(range:15-46 mm).305 patients(79.8%)had a stone burden≤20 mm,and77 patients(20.2%)had a stone burden>20 *** mean number of primary procedures was 1.3±0.2(range:1-3).The stone-free rates after the first and the second procedure were 73.4%and 86.9%,*** mean postoperative hospital stay was 3.1±1.2 d(range:2-6 d).The highest clearance rates were observed for proximal ureteral stones(100%)and renal pelvic stones(88.7%),while the lowest clearance rates were observed for lower calyx stones(76.7%)and multiple calyx stones(77.8%).The higher stone burden and the lower stone-free rates(89.8%vs 75.3%).The overall complication rate was 8.1%.There are some limitations to our study,however this is a retrospective review from a single *** addition,a single-surgeon experience obviously has limitations wi

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National Science Review 2024年第1期11卷 66-70页

作者： Shucheng xie State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences at Wuhan

‘Mass extinctions’ have been a hot topic for several decades. What triggers a mass extinction? How does a mass extinction impact the evolution of life? How does our ecosystem recover after a mass extinction? These questions attracted the interest of both scientists and the public *** spoke to two renowned researchers in the field of mass extinctions: Prof. Douglas H. Erwin from the National Museum of Natural History of the USA, and Prof. Shuzhong Shen from Nanjing University, China.

关键词： Stratigraphy

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

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Journal of Thermal Science 2024年第1期33卷 126-137页

作者： SUN Feng xie Gongnan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection *** existence of buoyancy force would lead to strongly anisotropic flow and thermal transport *** is closely related to the cooling performance of the *** elucidate the mechanisms of turbulent transport,the large eddy simulation(LES) was performed to assess turbulence statistics within different turbulence *** results indicated that the buoyancy and inertial force together dominated the change of turbulent ***,the spatial thermal buoyancy effect significantly suppressed the vertical velocity *** is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal *** the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,*** the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more *** thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer *** results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LES) buoyancy force turbulence statistics

维普期刊数据库

Output feedback stabilization of stochastic high-order planar nonlinear systems with stochastic inverse dynamics and output-constraint

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Science China(Information Sciences) 2024年第3期67卷 182-196页

作者： Ruiming xie Shengyuan XU Nanjing University of Science and Technology School of Automation

In this paper, we solve the output feedback control problem of stochastic high-order planar nonlinear systems with output constraint and stochastic integral input-to-state stability(SiISS) inverse dynamics. By employing a key coordinate transformation, a stochastic nonlinear system with output constraint and SiISS inverse dynamics is converted into an unconstrained system. By skillfully constructing an observer and adopting SiISS small-gain conditions, we develop a new output feedback control design and analysis method, and prove that all the closed-system signals are bounded almost surely, the output constraint is not violated almost surely, and the equilibrium point of the closed-loop system is stochastically asymptotically stable.

关键词： stochastic high-order planar nonlinear system output constraint stochastic inverse dynamics output feedback stabilization stochastic integral input-to-state stability (SiISS)

提高2.3m×12.9m篦冷机运行可靠性的措施

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水泥 2000年第10期 19-20页

作者：谢国海江苏省宜兴水泥厂 214221

我厂3号窑为Φ3m×48m日产700t熟料RSP型预分解窑.自1990年点火试生产以来,2.3m×12.9m组合推动篦式冷却机运行状况不佳.

关键词：篦式冷却机预分解窑运行可靠性水泥厂

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Fixed-time stabilization of output-constrained stochastic high-order nonlinear systems

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Science China(Information Sciences) 2024年第4期67卷 5-20页

作者： Ruiming xie Shengyuan XU Nanjing University of Science and Technology School of Automation

In this study, the fixed-time stabilization problem of stochastic high-order nonlinear systems with output constraint and high-order and low-order nonlinearities is addressed. A new coordinate transformation is employed to directly convert output-constrained stochastic systems into an equivalent unconstrained *** fully extracting the characteristics of system nonlinearities and using the stochastic fixed-time stability theorem, a new design and analysis method is constructed to guarantee that the trivial solution of the closed-loop system is stochastically fixed-time stable while fulfilling the output constraint.

关键词： stochastic high-order nonlinear system output constraint high-order and low-order nonlinearity fixed-time stabilization finite-time stabilization

Review of the research on the development and utilization of clay-type lithium resources

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Particuology 2024年第4期87卷 46-53页

作者： Ruiqi xie Zhihui Zhao Xiong Tong Xian xie Qiang Song Peiqiang Fan Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming650093China Yunnan Engineering Research Center for Metal Tailings Resource Utilization Kunming650093China

Since the demands for lithium have been in explosive growth recently and several great clay lithium resources were founded in China,the development and utilization of clay-type lithium resources become a hot *** order to provide a guidance for the concentration and extracting lithium of clay-type lithium resources,this review systematically summarized the main types and characteristics of clay-type lithium resources and the research status of lithium extraction from clay lithium ***,the flotation research status of the main mineral of clay lithium ore was also ***,we discussed the difficulties in the development and utilization of clay-type lithium ore and put forward the subsequent research *** paper can provide a guidance for the con-centration and extracting lithium of clay-type lithium resources in the future.

关键词： Clay lithium Clay mineral flotation Lithium extraction Leaching

Conductive and stable polyphenylene/CNT composite membrane for electrically enhanced membrane fouling mitigation

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 35-47页

作者： Huijuan xie Haiguang Zhang Xu Wang Gaoliang Wei Shuo Chen xie Quan Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

Nanocarbon-based conductive membranes, especially carbon nanotube (CNT)-based membranes, have tremendous potential for wastewater treatment and water purification because of their excellent water permeability and selectivity, as well as their electrochemically enhanced performance (e.g., improved antifouling ability). However, it remains challenging to prepare CNT membranes with high structural stability and high electrical conductivity. In this study, a highly electroconductive and structurally stable polyphenylene/CNT (PP/CNT) composite membrane was prepared by electropolymerizing biphenyl on a CNT hollow fiber membrane. The PP/CNT membrane showed 3.4 and 5.0 times higher electrical conductivity than pure CNT and poly(vinyl alcohol)/CNT (PVA/CNT) membranes, respectively. The structural stability of the membrane was superior to that of the pure CNT membrane and comparable to that of the PVA/CNT membrane. The membrane fouling was significantly alleviated under an electrical assistance of −2.0 V, with a flux loss of only 11.7% after 5 h filtration of humic acid, which is significantly lower than those of PP/CNT membranes without electro-assistance (56.8%) and commercial polyvinylidene fluoride (PVDF) membranes (64.1%). Additionally, the rejection of negatively charged pollutants (humic acid and sodium alginate) was improved by the enhanced electrostatic repulsion. After four consecutive filtration-cleaning cycle tests, the flux recovery rate after backwashing reached 97.2%, which was much higher than those of electricity-free PP/CNT membranes (67.0%) and commercial PVDF membranes (61.1%). This study offers insights into the preparation of stable conductive membranes for membrane fouling control in potential water treatment applications.

关键词： Polyphenylene CNTs Membrane Electro-assistance Membrane fouling mitigation