检索结果-南通市图书馆

Application of Digital Technology in Road and Bridge Design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Architectural Research and Development 2024年第4期8卷 92-99页

作者： bai fan China Merchants Chongqing Communications Technology Research&Design Institute Co. LTD.Chongqing 400067China

With the development and progress of science and technology,road and bridge design has experienced rapid development,from the initial manual drawing design to the popularity of Computer-Aided Design(CAD),and then to today’s digital software design *** designers relied on hand-drawn paper design forms which was time-consuming and *** support for road and bridge design not only saves the design time but the design quality has also achieved a qualitative *** paper engages in the application of digital technology in road and bridge design,to provide technical reference for China’s road and bridge engineering design units,to promote the popularity of Civil3D and other advanced design software in the field of engineering design and development,ultimately contributing to the sustainable development of China’s road and bridge engineering.

关键词： Road and bridge design Digital technology Civil3D Modelling Three-dimensional view Earth calculation

Structural Design of Roadbed and Pavement in Transition Section of Roads and Bridges

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of World Architecture 2024年第4期8卷 21-26页

作者： bai fan China Merchants Chongqing Communications Technology Research&Design Institute Co. LTD.Chongqing 400067China

As the lifeline of social development,road and bridge projects are the main channel to realize resource transportation and economic *** the quality of road and bridge project construction is crucial for the development of society,the economy,and people’s *** paper studies the design of roadbed pavement structures in road and bridge transition *** aims to provide technical references and significance for China’s road and bridge engineering design and construction units,promoting scientific and standardized design in these *** will contribute to the safety and stable operation of road and bridge projects,offering effective technical ***,it seeks to foster the sustainable and healthy development of China’s road and bridge engineering on a macro level.

关键词： Road and bridge transition section Roadbed pavement structure design Lap plate Easing transition section Drainage system

Study on the clogging mechanism of punching screen in sand control by the punching structure parameters

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 609-620页

作者： Fu-Cheng Deng Fu-Lin Gui bai-Tao fan Lei Wen Sheng-Hong Chen Ning Gong Yun-Chen Xiao Zhi-Hui Xu Yangtze University Jingzhou434023HubeiChina CNOOC Research Institute Ltd. Beijing100028China CNOOC Ener Tech-Drilling&Production Co. Tianjin300457China Tianjin Branch of CNOOC Ltd. Tianjin300459China

As an independent sand control unit or a common protective shell of a high-quality screen,the punching screen is the outermost sand retaining unit of the sand control pipe which is used in geothermal well or oil and gas ***,most screens only consider the influence of the internal sand retaining medium parameters in the sand control performance design while ignoring the influence of the plugging of the punching screen on the overall sand retaining performance of the *** explore the clogging mechanism of the punching screen,this paper established the clogging mechanism calculation model of a single punching screen sand control unit by using the computational fluid mechanics-discrete element method(CFD-DEM)combined *** to the combined motion of particles and fluids,the influence of the internal flow state on particle motion and accumulation was *** results showed that(1)the clogging process of the punching sand control unit is divided into three stages:initial clogging,aggravation of clogging and stability of *** the initial stage of blockage,coarse particles form a loose bridge structure,and blockage often occurs preferentially at the streamline gathering place below chamfering inside the sand control *** the stage of blockage intensification,the particle mass develops into a relatively complete sand bridge,which develops from both ends of the opening to the center of the *** the stable plugging stage,the sand deposits show a“fan shape”and form a“V-shaped”gully inside the punching slot element.(2)Under a certain reservoir particle-size distribution,The slit length and opening height have a large influence on the permeability and blockage rate,while the slit width size has little influence on the permeability and blockage *** microscopic clogging mechanism and its law of the punching screen prevention unit are proposed in this study,which has some field guidance significance for the design of punching screen

关键词： Punching screen Plugging CFD-DEM Size parameter Sand control

Experimental Study on Gas Flow Uniformity in a Diesel Particulate Filter Carrier

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第1期20卷 193-204页

作者： Zhengyong Wang Jianhua Zhang Guoliang Su Peixing Yang Xiantao fan Shuzhan bai Ke Sun Guihua Wang School of Energy and Power Engineering Shandong UniversityJinan250061China State Key Laboratory of Engines Tianjin UniversityTianjin300072China Weichai Power Emission Solutions Technology Company Limited Weifang261043China China·Shandong·YYO Emission Control System Co. Ltd.Liaocheng252100China

A Diesel Particulate Filter(DPF)is a critical device for diesel engine exhaust products *** using active-regeneration purification methods,on the one hand,a spatially irregular gas flow can produce relatively high local temperatures,potentially resulting in damage to the carrier;On the other hand,the internal temperature field can also undergo significant changes contributing to increase this *** study explores the gas flow uniformity in a DPF carrier and the related temperature behavior under drop-to-idle(DTI)condition by means of bench *** is shown that the considered silicon carbide carrier exhibits good flow uniformity,with a temperature deviation of no more than 2%with respect to the same radius measurement point at the outlet during the regeneration *** the DTI test,the temperature is relatively high within r/2 near the outlet end,where the maximum temperature peak occurs,and the maximum radial temperature gradient is located between r/2 and the *** these quantities grow as the soot load increases,thereby making the risk of carrier burnout ***,it is shown that the soot load limit of the silicon carbide DPF can be extended to 11 g/L,which reduces the frequency of active regeneration by approximately 40%compared to a cordierite DPF.

关键词： DPF flow uniformity DTI silicon carbide carrier soot load

Milling degree affects the fermentation properties of rice:perspectives from the composition of nutrients and gut microbiota via in vitro fermentation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第3期13卷 1578-1588页

作者： Yu Zhang fan Li Shutong Pan Bing bai Kai Huang Sen Li Hongwei Cao Tian Xie Jian Xie Xiao Guan School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China National Grain Industry(Urban Grain and Oil Security)Technology Innovation Center Shanghai 200093China Nutrition&Health Research Institute Co.Ltd. COFCO CorporationBeijing 102209China China Grain Wuhan Scientific Research&Design Institute Co.Ltd. Wuhan 430079China

Fermentation substrates of rice with different milling degrees(MDs) were prepared and fermented with human feces to compare their fermentation properties and effects on gut *** 0s,MD 5s and MD 60s represented brown rice,moderately-milled rice and white rice,*** in vitro fermentation,the MD 5s group showed higher starch utilization,compared with the MD 0s and 60s groups evaluated by Fourier transform infrared spectrometer,and confocal laser scanning *** of fermentation substrates of rice with different MDs on gut microbiota were evaluated by 16S rDNA *** the sample groups reduced the pH and produced short-chain fatty acids(SCFAs) and branched-chain fatty *** MD 5s group exhibited higher α-diversity than the MD 0s and 60s *** of Phascolarctobacterium,Blautia and norank_f_Ruminococcaceae were higher in the MD 0s and 5s groups,compared with the MD 60s *** bacteria were also positively correlated with the SCFAs production via Spearman correlation *** vitro culture assay revealed that fermentation substrates of MD 0s and 5s promoted the growth of two probiotics(Akkermansia muciniphila and Bifidobacterium adolescentis).Our results showed that moderate milling might be an appropriate way to produce rice products with richer nutrients and better fermentation properties.

关键词： Rice processing Milling Whole grains Gut microbiota

Simulation method for measurement of the cross-section of the^(14)N(n,a)^(11)B reaction using a gridded ionization chamber

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第8期32卷 1-11页

作者： Yi-Wei Hu hao-Yu Jiang Zeng-Qi Cui Jie Liu hao-fan bai Huai-Yong bai Jin-Xiang Chen Guo-Hui Zhang State Key Laboratory of Nuclear Physics and Technology Institute of Heavy lon PhysicsSchool of Physics.PekingUniversityBeijing 100871China Institute of Materials China Academy of EngineeringPhysicsJiangyou 621907China

A simulation method for measurement of the cross-section of the^(14)N(n,a)^(11)B reaction with gas and solid samples using a gridded ionization chamber(GIC)has been *** the simulation,the experimental spectra of both^(14)N(n,a)^(11)B events and background from other reactions can be predicted,and the experimental scheme can be *** to the simulation results,the optimal experimental parameters,including the pressure of the working gas and the compositions of the working gas and the sample,can be *** addition,the simulation results can be used to determine the valid event area and calculate the detection efficiency for valid events.A measurement of the cross-sections of the^(14)N(n,a)^(11)B reaction at E_(n)=4.25,4.50,4.75,5.00,5.25,and 5.50 MeV,based on the 4.5-MV Van de Graff accelerator at Peking University(PKU)using a GIC as the detector for the outgoing a particles,has been *** good agreement of the spectra from the simulation and experiment demonstrated the universality of this simulation method,which can be used to accurately measure neutroninduced light-charged particle emission reactions.

关键词： Gridded ionization chamber Monte Carlo simulation Cathode–anode two-dimensional spectrum ^(14)N(n,a)^(11)B reaction

Continuous-flow enzymatic synthesis of chiral lactones in a three-dimensional microfluidic reactor

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 299-303页

作者： Xuelei Deng Meng fan Miao Wu Xiaoyan Zhang Ya Cheng Jianye Xia Yingping Zhuang Weiping Zhu Xuhong Qian Yunpeng bai State Key Laboratory of Bioreactor Engineering Shanghai Collaborative Innovation Center for BiomanufacturingEast China University of Science and TechnologyShanghai 200237China The Extreme Optoelectromechanics Laboratory School of Physics and Materials ScienceEast China Normal UniversityShanghai 200241China Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China

A new continuous-flow process for the enzymatic synthesis of optically pureγ-lactones,which are used as flavors and fragrances in the food and cosmetic industries,was developed in a three-dimensional microfluidic *** microchannels(175 mm in length,0.9 mm in depth,and 1.72 mL in volume)were carved precisely inside a single borosilicate glass(90 mm×75 mm×12 mm)with ultrafast femtosecond laser *** flow field analysis and reaction simulation showed that the mixing of substrates and enzymes was enhanced,allowing the adjustment of residence time in a wide ***_(V4),a carbonyl reductase with excellent catalytic activity and enantioselectivity towardγ/δ-keto acids,was employed for the asymmetric synthesis of various chiral lactones.30 mmol/L(R)-γ-decalactone(3g)can be obtained in 26 s with a space-time yield(STY)up to 16,877 g L^(-1)d^(-1),which is 14.4 times higher than the highest STY of batch reaction reported *** continuous-flow process was applied to the synthesis of 6 chiral *** addition,the scaled-up synthesis of 3g was carried out in 6 cascade microreactors continuously for 6 h,demonstrating the feasibility and stability of the 3D continuous-flow process in enzymatic synthesis of optically pure compounds.

关键词： Continuous-flow Flow chemistry Microreactor Biocatalysis Carbonyl reductase Asymmetric reduction

Micropulse transscleral laser therapy for secondary angle-closure glaucoma in nanophthalmos: a case report

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第7期17卷 1381-1384页

作者： Ping Yu bai-Yu Hu Yu He Lin Jing Han-Ying fan Jing Shu Liu-Zhi Zeng Chengdu First People’s Hospital Chengdu 610095Sichuan ProvinceChina Eye School of Chengdu University of TCM Chengdu 610075Sichuan ProvinceChina

Dear Editor,The choice of surgical intervention for nanophthalmos patients with secondary angle-closure glaucoma poses a challenging decision for *** nanophthalmos patients who have undergone filtration surgery or other intraocular procedures are more susceptible to severe complications,including choroidal effusion,malignant glaucoma,and explosive choroidal hemorrhage,all of which can lead to vision loss[1].This dilemma is particularly pronounced in patients with shorter axial *** transscleral laser therapy(M-TLT),also known as micropulse transscleral cyclophotocoagulation(MP-TSCPC),is a nonincisional laser therapy surgery for glaucoma[2].In 2015,Golan and Kurtz[3]were the first to report four patients with secondary angle-closure glaucoma in nanophthalmos with axial lengths ranging between 17 and 19 mm(mean 18 mm)who were successfully treated with M-TLT,and choroidal detachment was observed in all patients(recovery spontaneously in two patients and recovery after systemic steroid treatment in the other two),of which two had a slight decrease in visual acuity.

关键词： glaucoma surgery closure

A comprehensive review on the potential therapeutic benefits of prospective probiotic Christensenella minuta

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Yueyao fan Yuhang Xiao Yingying Zhang Shiqing Zhang Weibin bai Jiali Chen Department of Food Science and Engineering Institute of Food Safety and Nutrition Guangdong Engineering Technology Center of Food Safety Molecular Rapid Detection Jinan University State Key Laboratory of Bioactive Molecules and Druggability Assessment Jinan University Centre for Cancer and Inflammation Research School of Chinese Medicine Hong Kong Baptist University

Bacterial family Christensenellaceae performed high heritability and associated with human health status. Numerous studies observed that the abundance of Christensenellaceae could be significantly reduced in patients with intestinal diseases or metabolic disorders， inferred that it may be treated as an effective biomarker. Christensenella minuta (C. minuta) was the first member of Christensenellaceae family isolated from human fecal samples. Accumulating evidences suggested that C. minuta may demonstrate a positive bio-therapeutic effects toward unhealthy status. Hence， this review aimed to systematically summarize the characterization of Christensenellaceae under specific health or diseases， and discover its promising application. Besides， the latest studies on the pharmacological research of C. minuta also summarized. Current important literatures grasped the potential health benefits of C. minuta in managing metabolic disorders， gut ecosystem， and inflammation. Whereas， several critical knowledge gaps about the safe and clinical application remain should be addressed in future verification. C. minuta is worthy to be elevated as the next prospective probiotic star in nutraceutical or medical field and should not be overlooked.

关键词：