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振动辅助排痰配合乙酰半胱氨酸雾化吸入治疗婴幼儿肺炎的临床效果

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临床合理用药 2025年第2期18卷 31-34页

作者：刘小松刘梦奇江西省萍乡市妇幼保健院儿内一科 337000

目的观察振动辅助排痰配合乙酰半胱氨酸雾化吸入治疗婴幼儿肺炎的临床效果。方法选取2021年8月—2022年8月萍乡市妇幼保健院儿内一科收治的肺炎患儿80例,采用随机数字表法分为观察组和对照组,各40例。2组患儿均予常规治疗,对照组在常规... 详细信息

目的观察振动辅助排痰配合乙酰半胱氨酸雾化吸入治疗婴幼儿肺炎的临床效果。方法选取2021年8月—2022年8月萍乡市妇幼保健院儿内一科收治的肺炎患儿80例,采用随机数字表法分为观察组和对照组,各40例。2组患儿均予常规治疗,对照组在常规治疗基础上加用吸入用乙酰半胱氨酸溶液治疗,观察组在对照组基础上配合振动辅助排痰,2组患儿均治疗7 d。比较2组临床效果、症状体征(发热、咳嗽、气喘、肺部湿性啰音)消失时间、住院时间、住院费用,治疗前后血常规指标[白细胞计数(WBC)、C反应蛋白(CRP)、降钙素原(PCT)]水平以及不良反应。结果观察组治疗总有效率为97.50%,高于对照组的85.00%(χ^(2)=3.914,P=0.048);观察组发热、咳嗽、气喘消失时间、肺部湿性啰音消失时间及住院时间均短于对照组,住院费用低于对照组(P<0.01);治疗7 d后,2组WBC及血清CRP、PCT水平均较治疗前下降,且观察组低于对照组(P<0.01);观察组与对照组不良反应总发生率(12.50%vs.10.00%)比较差异无统计学意义(χ^(2)=0.125,P=0.723)。结论振动辅助排痰配合乙酰半胱氨酸雾化吸入治疗婴幼儿肺炎的临床效果较好,可有效缓解患儿症状表现与炎性反应程度,且安全性较高。

关键词：婴幼儿肺炎乙酰半胱氨酸振动辅助排痰治疗效果

Synthesis of Bio-Plasticizer from Soybean Oil and Its Application in Poly(Vinyl Chloride) Films

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Journal of Renewable Materials 2020年第10期8卷 1295-1304页

作者： Xiao Luo Hongying Chu mengqi liu Henan University of Chinese Medicine Zhengzhou450046China Yellow River Conservancy Technical Institute Kaifeng475004China

Herein,epoxidized soybean oil methyl ester(ESOM)plasticizer was synthesized for the preparation of plasticized poly(vinyl chloride)(PVC)films by the alcoholysis and *** chemical structure of ESOM was investigated by infrared spectrum and 1 H nuclear magnetic *** effect of content of ESOM and petroleum based plasticizer di-2-ethylhexyl phthalate(DEHP)on the performance of plasticized PVC films was *** result showed that substituting DEHP with ESOM can improve the thermal stability of plasticized PVC *** the weight ratio of ESOM and PVC is fixed at 1:2,plasticized PVC film presents higher elongation at break(350.8%vs.345.1%)and lower tensile strength(14.21 MPa vs.15.8 MPa)compared with PVC plasticized with *** showed less weight loss than DEHP in all *** excellent migration resistance of ESOM is helpful to improve stability of plasticized PVC *** all,the obtained bio-based plasticizer will be potential to replace petroleum based plasticizer DEHP in flexible PVC materials.

关键词： Soybean oil epoxy plasticizer poly(vinyl chloride) glass transition temperature

Supply Coordination Based on Bonus Policy in Assembly under Uncertain Delivery Time

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Chinese Journal of Mechanical Engineering 2013年第2期26卷 293-303页

作者： LI Guo liu mengqi WANG Zhaohua PENG Bingzong School of Management and Economics Beijing Institute of technology School of Business Administration Hunan University School of Management Huazhong University of Science and Technology

The existing research of supply coordination under uncertain delivery time mainly focuses on the collaboration between the supplier and the manufacturer, which aim at minimizing the total cost of each side and finding comparative optimal solutions under decentralized decision. In the supply coordination, the collaboration between suppliers in assembly system is usually not considered. As a result, the manufacturer’s production is often delayed due to mismatching delivery of components between suppliers. Therefore, to ensure supply coordination in assembly system, collaboration between suppliers should be taken into consideration. In this paper, an assembly system with two suppliers and one manufacturer under uncertain delivery time is considered. The model is established and optimal solution is given under decentralized decision. Furthermore, the cost functions of two suppliers are both convex, and a unique Nash equilibrium exists between two suppliers. Then the optimal decision under supply coordination is analyzed, which is regarded as a benchmark for supply coordination. Additionally, the total cost of the assembly system is jointly convex in agreed delivery time. To achieve supply coordination a bonus policy is explored in the assembly system under uncertain delivery time, and the total cost under bonus policy must be lower than under decentralized decision. Finally the numerical and sensitivity analysis shows the cost of assembly system under bonus policy equals that under supply coordination, and the cost of each side in assembly system under bonus policy is lower compared to that under decentralized decision. The proposed research minimizes the total cost of each side with bonus policy in assembly system, ensures the supply coordination between suppliers and the manufacturer, and improves the competiveness of the whole supply chain.

关键词： supply coordination bonus policy assembly system uncertain delivery time

Use of lime mud from paper mill as a heterogeneous catalyst for transesterification

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Science China(Technological Sciences) 2014年第2期57卷 438-444页

作者： LI Hui NIU ShengLi LU ChunMei liu mengqi HUO MengJia School of Energy and Power Engineering National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction Shandong University

Lime mud （LM）, a solid waste from the paper mill, is used as an economic and environmental friendly heterogeneous basic catalyst for transesterification, which is accompanied by characterization of X-ray fluorescence, thermogravimetric-differential thermal analysis, X-ray diffraction, N2 adsorption, and Hammett indicator method. To investigate the performance of the achieved catalyst, which is activated through calcination, the aspects of calcination temperature, reaction time, mole ratio of methanol to oil, catalyst addition percentage, and reaction temperature are concerned. Characterization of catalyst reveals that LM could be activated through calcination to transform the carbonate and hydrate of calcium into the oxide forms and higher calcination temperature could lead to stronger basic strength. However, N2 adsorption results indicate that higher temperature causes the sintering of the catalyst and shrinkage of the catalyst grains. When LM is activated at 800℃ （LM-800） and the reac- tion is carried out at 64℃ with a methanol to oiL mole ratio of 15：1, catalyst addition percentage of 6%, and reaction time of 2 h, the maximum transesterification conversion of 94.35% could be achieved. Reusability of LM-800 is also investigated com- pared with laboratory grade CaO in five reaction cycles and the results indicate that the catalysts derived from LM can be used as an economic and efficient catalyst for biodiesel production.

关键词： lime mud biodiesel heterogeneous catalyst transesterification industry waste

成都双流航空港云底高度及地表太阳辐射特征分析

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成都信息工程大学学报 2025年第1期40卷 94-99页

作者：刘雨馨卢会国吴昊刘梦琪成都信息工程大学电子工程学院四川成都610225

云底高度是重要的云宏观物理参数,地表太阳辐射占据全球辐射平衡的重要地位。云底高度与太阳辐射的定量化研究有利于加深对气象的理解,进而改进精细化城市气象预报;对成都地区云底高度及太阳辐射的综合观测还可以加强对该地区云情况的... 详细信息

云底高度是重要的云宏观物理参数,地表太阳辐射占据全球辐射平衡的重要地位。云底高度与太阳辐射的定量化研究有利于加深对气象的理解,进而改进精细化城市气象预报;对成都地区云底高度及太阳辐射的综合观测还可以加强对该地区云情况的了解与太阳辐射资源利用。基于成都双流航空港地区2021年9月至2023年2月的地基观测数据,对云底高度与地表太阳辐射特征进行研究,结果表明:季节循环上,成都双流航空港地区夏季云底高度较高,秋冬较低且数值接近,该区域天空大部分时间被云覆盖,与附近其他地区云特征类似。由于云的遮盖,该地区太阳辐射数据整体较低,太阳总辐射在夏季较高,约为540 W/m^(2),秋冬较低,平均在340 W/m^(2)以下。四季太阳总辐射日变化趋势相近,均在12:00-14:00达到最高点且直接辐射均低于散射辐射。研究在评估和预测成都地区云特征及太阳辐射资源方面具有一定参考价值。

关键词：云底高度成都太阳辐射

Numerical Study on the Gas Leakage and Dispersion at the Street Intersection of a Building Group

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Computer Modeling in Engineering & Sciences 2020年第6期123卷 1247-1266页

作者： Weitao Zhang mengqi liu Kaiyi Wang Fan Zhang Lei Hou National Engineering Laboratory for Pipeline Safety Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of PetroleumBeijing102249China CangHaiBang Business Unit Supply Chain Business GroupSinochem Energy High-Tech Co.Ltd.Beijing100094China Sinopec Economics&Development Research Institute Beijing100029China College of Arts and Science Boston UniversityBostonMA 02215USA.

Accidents involving natural gas leakage and dispersion pose a significant threat to human life and *** threat is especially relevant at the street intersection at which dense buildings,heavy traffic flow,and complex underground pipe networks *** have conducted numerous studies on gas leakage and dispersion,but investigations of natural gas leakage and dispersion at the street intersection of a building group are not *** this paper,we presented a three-dimensional(3D)physical model based on the Computational Fluid Dynamic(CFD)methodology to study the natural gas leakage and dispersion at the street intersection of a building *** validated the CFD methodology applied in the research based on the data from the field tests and wind tunnel ***,we simulated and analyzed the pressure,wind,and concentration of natural gas dispersion at the street *** simulation results showed that vortex regions,low-pressure zones,and a building group effect could cause a build-up of natural gas concentration under perpendicular wind direction *** addition,the area of hazardous region tended to increase first and then drop with the dispersion *** the case of this study,the maximum area of hazardous region is 200 m2 located in the height of 55 m,which is the middle plane in the computational *** results in the paper can provide scientific references for the safe operation and emergency-management decisions of municipal gas.

关键词： Natural gas computational fluid dynamic building group street intersection leakage and dispersion numerical simulation concentration field

Value-Added Products Derived from 15 Years of High-Quality Surface Solar Radiation Measurements at Xianghe,a Suburban Site in the North China Plain

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Advances in Atmospheric Sciences 2023年第6期40卷 1132-1141页

作者： mengqi liu Xuehua FAN Xiang'ao XIA Jinqiang ZHANG Jun LI Key Laboratory of Atmospheric Sounding Chengdu University of Information TechnologyChengdu 610225China LAGEO Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

Surface solar radiation(SSR) is a key component of the energy budget of the Earth’s surface, and it varies at different spatial and temporal scales. Considerable knowledge of how and why SSR varies is crucial to a better understanding of climate change, which surely requires long-term measurements of high quality. The objective of this study is to introduce a value-added SSR dataset from Oct 2004 to Oct 2019 based on measurements taken at Xianghe, a suburban site in the North China Plain;two value-added products based on the 1-minute SSR measurements are developed. The first is clear sky detection by using a machine learning model. The second is cloud fraction estimation derived from an effective semiempirical method. A “brightening” of global horizontal irradiance(GHI) was revealed and found to occur under both clear and cloudy conditions. This could likely be attributed to a reduction in aerosol loading and cloud fraction. This dataset could not only improve our knowledge of the variability and trend of SSR in the North China Plain, but also be beneficial for solar energy assessment and forecasting.

关键词： surface solar radiation clear sky detection cloud fraction North China Plain

Enhanced thermal isolation in porous thermal barrier coatings by the formation of pore guided thermal-shock cracks

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Science China(Technological Sciences) 2023年第4期66卷 1007-1017页

作者： ZHEN Yu WU KaiJin liu mengqi ZHENG SongLin HE LingHui YU Yin NI Yong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230026China National Key Laboratory of Shock Wave and Detonation Physics China Academy of Engineering PhysicsInstitute of Fluid PhysicsMianyang 621900China

Pore structure design is an effective strategy to tailor the thermal isolation capability of thermal barrier coatings(TBCs).Pursuing optimal porosity is crucial to balance the requirements of thermal isolation and mechanical reliability since the pore structure shields thermal heat transfer but increases mechanical *** this work,we investigate how thermal heat transfer couples with fracture propagation in porous TBCs by the using thermo-mechanical coupling phase field model for *** simulated results show that cracks induced by thermal shock favor deflection that is sometimes perpendicular to the direction of heat *** thermal conductivity degradation by the transverse cracks significantly impedes thermal heat transfer,leads to enhanced reduction of the effective thermal conductivity of TBCs,decreases the average thermal stress of the substrate,and thus decreases the risk of the crack penetrating into the *** numerical results demonstrate that the phase field method fully considering the thermo-mechanical interaction between cracks and pores can be a useful tool to improve the thermal isolation of porous TBCs under extreme thermal shock loadings through pore structure design.

关键词： phasefield TBCs porosity thermal shock cracks

Data-driven Estimation of Cloud Effects on Surface Irradiance at Xianghe,a Suburban Site on the North China Plain

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Advances in Atmospheric Sciences 2022年第12期39卷 2213-2223页

作者： mengqi liu Jinqiang ZHANG Hongrong SHI Disong FU Xiang'ao XIA Key Laboratory of Atmospheric Sounding Chengdu University of Information TechnologyChengdu 610225China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China

Clouds are a dominant modulator of the energy *** cloud shortwave radiative effect at the surface(CRE)is closely related to the cloud macro-and micro-physical *** observation of surface irradiance and cloud properties are needed to narrow uncertainties in *** this study,1-min irradiance and Total Sky Imager measurements from 2005 to 2009 at Xianghe in North China Plain are used to estimate cloud types,evaluate cloud fraction(CF),and quantify the sensitivities of surface irradiance with respect to changes in CF whether clouds obscure the sun or *** annual mean CF is 0.50,further noting that CF exhibits a distinct seasonal variation,with a minimum in winter(0.37)and maximum in summer(0.68).Cumulus occurs more frequently in summer(32%),which is close to the sum of the occurrence of stratus and *** annual CRE is–54.4 W m^(–2),with seasonal values ranging from^(–2)9.5 W m^(–2)in winter and–78.2 W m^(–2)in *** clouds do not obscure the sun,CF is a dominant factor affecting diffuse irradiance,which in turn affects global *** is a positive linear relationship between CF and CRE under sun-unobscured conditions,the mean sensitivity of CRE for each CF 0.1 increase is about 1.2 W m^(–2)[79.5°

关键词： cloud radiative effect solar radiation cloud fraction cloud-radiation interaction