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Model Study on a Submerged Catalysis/Membrane Filtration System for Phenol Hydroxylation Catalyzed by TS-1 被引量:3
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作者 陈日志 姜红 +1 位作者 金万勤 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第4期648-653,共6页
This ranearch is focused on the, develonment of a simnle design model of the submerged catalysis/membrane filtration (catalysis/MF) system for phenol hydroxylation over TS-1 based on the material balance of the phen... This ranearch is focused on the, develonment of a simnle design model of the submerged catalysis/membrane filtration (catalysis/MF) system for phenol hydroxylation over TS-1 based on the material balance of the phenol under steady state and the reported kinetic studies. Based on the developed model, the theoretical phenol Conversions at steady state could be calculated using the kinetic parameters obtained from the previous batch experiments. The theoretical conversions are in good agreement with the experimental data obtained in the submerged catalysis/MF system within relative error of ±5%. The model can be used to determine the optimal experimental conditions to carry out the phenol hydroxylation over TS-1 in the submerged catalysis/MF system. 展开更多
关键词 submerged catalysis/membrane filtration system phenol hydroxylation TS-1
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Ensuring water security by utilizing roof-harvested rainwater and lake water treated with a low-cost integrated adsorption-filtration system 被引量:2
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作者 Riffat Shaheed Wan Hanna Melini Wan Mohtar Ahmed El-Shafie 《Water Science and Engineering》 EI CAS CSCD 2017年第2期115-124,共10页
Drinking water is supplied through a centralized water supply system and may not be accessed by communities in rural areas of Malaysia.This study investigated the performance of a low-cost, self-prepared combined acti... Drinking water is supplied through a centralized water supply system and may not be accessed by communities in rural areas of Malaysia.This study investigated the performance of a low-cost, self-prepared combined activated carbon and sand filtration(CACSF) system for roofharvested rainwater and lake water for potable use. Activated carbon was self-prepared using locally sourced coconut shell and was activated using commonly available salt rather than a high-tech procedure that requires a chemical reagent. The filtration chamber was comprised of local,readily available sand. The experiments were conducted with varying antecedent dry intervals(ADIs) of up to 15 d and lake water with varying initial chemical oxygen demand(COD) concentration. The CACSF system managed to produce effluents complying with the drinking water standards for the parameters p H, dissolved oxygen(DO), biochemical oxygen demand(BOD5), COD, total suspended solids(TSS), and ammonia nitrogen(NH_3-N). The CACSF system successfully decreased the population of Escherichia coli(E. coli) in the influents to less than 30 CFU/m L. Samples with a higher population of E. coli(that is, greater than 30 CFU/m L) did not show 100% removal. The system also showed high potential as an alternative for treated drinking water for roof-harvested rainwater and class II lake water. 展开更多
关键词 LOW-COST activated carbon INTEGRATED adsorption-sand filtration Roof-harvested RAINWATER Lake WATER WATER security
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Application of multi-stage bio-filtration system for sewage treatment and analysis of the microbial community 被引量:1
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作者 刘智晓 赵志伟 +1 位作者 崔福义 张梦阳 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第6期746-750,共5页
The conventional fixed-bed biofilm process has disadvantages of easily blocked,high headloss and short operation cycle.For overcoming these disadvantages,a multi-stage biofilm reactor(MSBFR),in which the lightweight f... The conventional fixed-bed biofilm process has disadvantages of easily blocked,high headloss and short operation cycle.For overcoming these disadvantages,a multi-stage biofilm reactor(MSBFR),in which the lightweight floating filter was dominant,was set up and operated.For detail investigation of the system when treating municipal wastewater,the succession characteristic of microbial community was analyzed by polymerase chain reaction(PCR)-Denaturing Gradient Gel Electrophoresis(DGGE)method.The results showed that the process had high efficiency to removal COD,SS and NH4+-N.The concentration of COD,SS and NH4-N in effluent were maintained lower than 40 mg/L,5 mg/L and 2 mg/L even though the concentration of COD,SS and NH4+-N in influent were 232-663 mg/L,105-245 mg/L and 23.7-62.7 mg/L,respectively,and the empty bed retention time was 3 h.Furthermore,biofilm samples taken from the column 2nd in height were analyzed by PCR-DGGE.The result of PCR-DGGE analysis showed that the microbial community had a little change in height and the dominant groups were Paracoccus sp.,Lactobacillus delbrueckii,Pseudomonas sp.and Bacteroidetes bacterium. 展开更多
关键词 biological filtration microbial community structure NITRIFICATION AOB PCR-DGGE
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Low-Cost Stormwater Filtration System to Improve Urban Water Quality: The Case of Addis Ababa, Ethiopia
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作者 Dagnachew Adugna Larissa Larsen +1 位作者 Brook Lemma Geremew Sahilu 《Journal of Water Resource and Protection》 2017年第6期692-705,共14页
Urbanization in developing countries often negatively impacts water re-sources by polluting surface waters. Addis Ababa, Ethiopia, is currently experiencing rapid urbanization accompanied by significant water shortage... Urbanization in developing countries often negatively impacts water re-sources by polluting surface waters. Addis Ababa, Ethiopia, is currently experiencing rapid urbanization accompanied by significant water shortages, unmanaged stormwater, and increasing river water pollution. To supplement the need for non-potable water and address stormwater runoff pollution, we constructed a low cost stormwater filtration system. The filtration system is comprised of a sedimentation area followed by three gravel grain sizes arranged horizontally from coarse to medium to fine filter media. We compared the quality of pretreatment water with post-treatment water by measuring physicochemical parameters, heavy metals and nutrients. We found that the filtration system reduced turbidity by 87%, TSS by 80%, Cu by 87% and Zn by 90%. Further, it positively increased the concentration of DO by 42%. However, the filtration system did not remove nitrates and nitrites. Implementing this system at outfalls in the rapidly expanding condominium housing areas can increase residents’ supply of non-potable water and reduce the amount of polluted stormwater entering nearby streams and rivers. 展开更多
关键词 Low COST STORMWATER filtration Addis Ababa Water Quality Performance Test
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Pretreatment of highly turbid coal mine drainage by a chemical agent free filtration system
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作者 Zhang Chunhui He Xiong +3 位作者 Li Kaihe Wu Dongsheng Guo Yanrong Wang Can 《International Journal of Mining Science and Technology》 SCIE EI 2012年第5期699-701,共3页
A filtration system used without chemical agents for the pretreatment of turbid coal mine drainage is described in this paper.The influence of different aperture sizes and different motor speeds was investigated durin... A filtration system used without chemical agents for the pretreatment of turbid coal mine drainage is described in this paper.The influence of different aperture sizes and different motor speeds was investigated during the study.The experimental results show that for aperture diameters of 0.4,0.6,or 0.8 mm smaller apertures provide more complete filtration.Rotations of 12,20,28,or 40 r/min show that higher speeds give more efficient filtration.Suspended solids decreased in both particle size and concentration after the filtration.The separated slime can be directly reused as a fuel.Efficient filtration pretreatment systems for coal mine drainage were investigated and the economic feasibility is analyzed in this article. 展开更多
关键词 Coal mine drainage Pretreatment filtration and separation Suspended solids
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Design and Development of Innovative Highland Water Filtration System
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作者 Mohd Hudzari Razali Syazili Roslan +2 位作者 Abdus Ssomad M. Abd Halim Ahmad Farizal Md. Shokeri Nur Azuan Husin 《World Journal of Engineering and Technology》 2016年第3期383-390,共8页
The righteous book of Al-Quran mentions that the basic need of the living thing in this world is water. Resident of rural areas such as indigenous people will tap the highland aquatic resources as the main foundation ... The righteous book of Al-Quran mentions that the basic need of the living thing in this world is water. Resident of rural areas such as indigenous people will tap the highland aquatic resources as the main foundation for water. The reservoir is built on the top of hilly area to collect water before it discharges through a pipe system that uses the force of gravity to go down to the settlements. However, the filtration system frequently clogs and requires the occupants to climb up the reservoir hill for cleaning process. A lot of energy and time are required to manage the irrigation systems. Thus, an innovation system has been conducted as the filters will be cleaned automatically using solar energy supply. The designs of the filters are specially designed as the filter is equipped with electric motors, washer rods, power supply units, and automatic control box. The advantages of this project are the product will filtered the water as remain as natural highland watering resources while using the solar energy to accomplished green technology application. 展开更多
关键词 Water filtration Clogging and Foreign Material Solenoid Valve Relay Automation Solar Energy
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Determining V-I characteristics of energy-efficient electrostatic assisted air filtration system by utilizing the back-corona induced current model
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作者 Zhuangbo Feng Shi-Jie Cao Zhengwei Long 《Energy and Built Environment》 2023年第2期227-235,共9页
The widely utilized high efficient particulate air filters(HEPA)and electrostatic precipitator(ESP)respectively has the shortcomings of relatively high energy consumption and low filtration efficiency.In order to over... The widely utilized high efficient particulate air filters(HEPA)and electrostatic precipitator(ESP)respectively has the shortcomings of relatively high energy consumption and low filtration efficiency.In order to overcome the disadvantages of two traditional air filtration system,electrostatic assisted air filtration system(combining HEPA and ESP)has been proven to achieve high filtration efficiency and low energy consumption simultaneously.Predicting of V-I characteristics of electrostatic filtration system with configuration of“pin to filter medium to grounded device”is very essential and challenging due to the back corona phenomenon.This study utilized the back-corona based current model to predict the V-I characteristics of electrostatic system with different filter medium types and“pin-to-filter”distances.Experiments are conducted to provide data for model validation by changing filter types and locations of discharge pin.The results indicated that both of the predicted values of total discharge current and back-corona induced current agreed well with the experimentally measured data.This validated mathematical model could be used for preliminary design of electrostatic assisted filtration system with configuration of“pin to filter to grounded device”.Based on the V-I characteristics predicted by the semi-empirical model,the electrostatic filtration efficiency could be estimated. 展开更多
关键词 Electrostatic assisted air filtration system Corona discharge Back corona Voltage-current characteristic ENERGY-EFFICIENT
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Characterization of particle deposition during crossflow filtration as influenced by permeate flux and crossflow velocity using a microfluidic filtration system 被引量:1
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作者 Hongzhan Di Gregory J.O.Martin Dave E.Dunstan 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2021年第3期552-561,共10页
Particle deposition during crossflow filtration is significantly influenced by the operating conditions,in particular the permeate flux and crossflow velocity.However,there is a lack of detailed knowledge about how de... Particle deposition during crossflow filtration is significantly influenced by the operating conditions,in particular the permeate flux and crossflow velocity.However,there is a lack of detailed knowledge about how deposit layer structures and distributions depend on operating parameters.This study uses a microfluidic visualisation filtration system to examine the influence of operating conditions on the deposition process during crossflow ultrafiltration from a microscopic perspective.Increasing the permeate flux caused an increasing amount of deposition and a thicker deposit layer.Higher crossflow velocities reduced the extent of deposition.The degree of deposition varied over a range of operating conditions due to the altered hydrodynamic forces exerted on the particles,which can be examined by the deposition probability according to an existing model.Building on this,an empirical correlation between the deposition probability and volume of deposition as a function of filtration time was developed,which gave good agreement with experimental results.The effect of solution conditions was also involved in this correlation as a interaction energies.This could be useful for predicting the dynamic deposition process during crossflow filtration over a range of operating and solution conditions. 展开更多
关键词 particle deposition crossflow filtration MICROFLUIDICS confocal microscopy
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Microbial Removal from Secondary Treated Wastewater Using a Hybrid System of Ultrafiltration and Reverse Osmosis 被引量:1
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作者 Jehad Abbadi Rinad Saleh +5 位作者 Sameh Nusseibeh Muhannad Qurie Mustafa Khamis Rafik Karaman LauraScrano Sabino Aurelio Bufo 《Journal of Environmental Science and Engineering(A)》 2012年第7期853-869,共17页
The efficiency of advanced membranes towards removal of general and specific microbes from wastewater was investigated. The treatment included a subsequent system of activated sludge, ultrafiltration (hollow fibre me... The efficiency of advanced membranes towards removal of general and specific microbes from wastewater was investigated. The treatment included a subsequent system of activated sludge, ultrafiltration (hollow fibre membranes with 100 kDa cut-off, and spiral wound membranes with 20 kDa cut-off), and RO (reverse osmosis). The removal evaluation of screened microbes present in treated wastewater showed that hollow fibre membrane rejected only 1 log (90% rejection) of the TPC (total microbial count), TC (total coliforms), and FC (faecal coliforms). A higher effectiveness was observed with spiral wound, removing 2-3 logs (99%-99.9%) of TPC and complete rejection of TC and FC. The RO system was successful in total rejection of all received bacteria. The removal evaluation of inoculated specific types of bacteria showed that the hollow membranes removed 2 logs (99%) of inoculated E. coli (10^7-10^8 cfu/mL inoculum), 2-3 logs (99%-99.9%) of Enterococus spp. (10^7-10^10 cfu/mL inoculum), 1-2 logs (90%-99%) of Salmonella (10^8-10^10 cfu/mL inoculum) and 1-2 logs (90%-99%) of Shigella (10^5-10^6 cfu/mL inoculum). The spiral wound was significantly efficient in rejecting further 3 logs of E. coil, 5 logs of Enterococus spp., 4 logs of Salmonella, and a complete rejection of all received bacteria was accomplished by RO membrane. The results indicate that Gram positive bacteria were removed much more efficiently compared to the Gram negative ones, the rationale behind such behaviour is based on cell walls elasticity. 展开更多
关键词 Wastewater treatment microbial load removal ULTRAfiltration reverse osmosis filtration technology microbial fouling.
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A high Li-ion diffusion kinetics in multidimensional and compact-structured electrodes via vacuum filtration casting 被引量:1
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作者 Jieqiong Li Ting Ouyang +3 位作者 Lu Liu Shu Jiang Yongchao Huang M.-Sadeeq Balogun 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期368-376,I0010,共10页
Manufacturing process,diffusion co-efficient and areal capacity are the three main criteria for regulating thick electrodes for lithium-ion batteries(LIBs).However,simultaneously regulating these criteria for LIBs is ... Manufacturing process,diffusion co-efficient and areal capacity are the three main criteria for regulating thick electrodes for lithium-ion batteries(LIBs).However,simultaneously regulating these criteria for LIBs is desirable but remains a significant challenge.In this work,niobium pentoxide(Nb_(2)O_(5))anode and lithium iron phosphate(LiFePO_(4))cathode materials were chosen as the model materials and demonstrate that these three parameters can be simultaneously modulated by incorporation of micro-carbon fibers(MCF)and carbon nanotubes(CNT)with both Nb_(2)O_(5) and LFP via vacuum filtration approach.Both as-prepared MNC-20 anode and MLC-20 cathode achieves high reversible areal capacity of≈5.4 m A h cm^(-2)@0.1 C and outstanding Li-ion diffusion coefficients of≈10~(-8)cm~2 s~(-1)in the half-cell configuration.The assembled MNC-20‖MLC-20 full cell LIB delivers maximum energy and power densities of244.04 W h kg^(-1)and 108.86 W kg^(-1),respectively.The excellent electrochemical properties of the asprepared thick electrodes can be attributed to the highly conductive,mechanical compactness and multidimensional mutual effects of the MCF,CNT and active materials that facilitates rapid Li-ion diffusion kinetics.Furthermore,electrochemical impedance spectroscopy(EIS),symmetric cells analysis,and insitu Raman techniques clearly validates the enhanced Li-ion diffusion kinetics in the present architecture. 展开更多
关键词 Thick electrodes Carbon nanotubes Li-ion diffusion co-efficient Vacuum filtration technique High areal capacity Lithium-ion batteries
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Machine learning-based comparison of factors influencing estimated glomerular filtration rate in Chinese women with or without nonalcoholic fatty liver 被引量:1
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作者 I-Chien Chen Lin-Ju Chou +2 位作者 Shih-Chen Huang Ta-Wei Chu Shang-Sen Lee 《World Journal of Clinical Cases》 SCIE 2024年第15期2506-2521,共16页
BACKGROUND The prevalence of non-alcoholic fatty liver(NAFLD)has increased recently.Subjects with NAFLD are known to have higher chance for renal function impairment.Many past studies used traditional multiple linear ... BACKGROUND The prevalence of non-alcoholic fatty liver(NAFLD)has increased recently.Subjects with NAFLD are known to have higher chance for renal function impairment.Many past studies used traditional multiple linear regression(MLR)to identify risk factors for decreased estimated glomerular filtration rate(eGFR).However,medical research is increasingly relying on emerging machine learning(Mach-L)methods.The present study enrolled healthy women to identify factors affecting eGFR in subjects with and without NAFLD(NAFLD+,NAFLD-)and to rank their importance.AIM To uses three different Mach-L methods to identify key impact factors for eGFR in healthy women with and without NAFLD.METHODS A total of 65535 healthy female study participants were enrolled from the Taiwan MJ cohort,accounting for 32 independent variables including demographic,biochemistry and lifestyle parameters(independent variables),while eGFR was used as the dependent variable.Aside from MLR,three Mach-L methods were applied,including stochastic gradient boosting,eXtreme gradient boosting and elastic net.Errors of estimation were used to define method accuracy,where smaller degree of error indicated better model performance.RESULTS Income,albumin,eGFR,High density lipoprotein-Cholesterol,phosphorus,forced expiratory volume in one second(FEV1),and sleep time were all lower in the NAFLD+group,while other factors were all significantly higher except for smoking area.Mach-L had lower estimation errors,thus outperforming MLR.In Model 1,age,uric acid(UA),FEV1,plasma calcium level(Ca),plasma albumin level(Alb)and T-bilirubin were the most important factors in the NAFLD+group,as opposed to age,UA,FEV1,Alb,lactic dehydrogenase(LDH)and Ca for the NAFLD-group.Given the importance percentage was much higher than the 2nd important factor,we built Model 2 by removing age.CONCLUSION The eGFR were lower in the NAFLD+group compared to the NAFLD-group,with age being was the most important impact factor in both groups of healthy Chinese women,followed by LDH,UA,FEV1 and Alb.However,for the NAFLD-group,TSH and SBP were the 5th and 6th most important factors,as opposed to Ca and BF in the NAFLD+group. 展开更多
关键词 Non-alcoholic fatty liver Estimated glomerular filtration rate Machine learning Chinese women
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Filtration performance and modeling of granular bed for dust removal from coal pyrolytic vapors
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作者 Shuaiqiang Yang Lin Du +3 位作者 Guangchao Ding Runguo Liu Wenli Song Songgeng Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第1期35-42,共8页
Dust removal from pyrolytic vapors at high temperatures is an obstacle to the industrialization of the coal pyrolysis process.In this work,a granular bed with expanded perlites as filtration media was designed and int... Dust removal from pyrolytic vapors at high temperatures is an obstacle to the industrialization of the coal pyrolysis process.In this work,a granular bed with expanded perlites as filtration media was designed and integrated into a 10 t·d^(–1)coal pyrolysis facility.The testing results showed that around 97.56%dust collection efficiency was achieved.As a result,dust content in tar was significantly lowered.The pressure drop of the granular bed maintained in the range of 356 Pa to 489 Pa.The dust size in the effluent after filtration exhibited a bimodal distribution,which was attributed to the heterogeneity of the dust components.The effects of filtration bed on pyrolytic product yields were also discussed.A modified filtration model based on the macroscopic phenomenological theory was proposed to describe the performance of the granular bed.The computation results were well agreed with the experimental data. 展开更多
关键词 Granular bed filtration Dust removal PYROLYSIS filtration FIXED-BED
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Deep bed filtration model for cake filtration and erosion
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作者 L.I.KUZMINA Y.V.OSIPOV A.R.PESTEREV 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第2期355-372,共18页
Many phenomena in nature and technology are associated with the filtration of suspensions and colloids in porous media. Two main types of particle deposition,namely, cake filtration at the inlet and deep bed filtratio... Many phenomena in nature and technology are associated with the filtration of suspensions and colloids in porous media. Two main types of particle deposition,namely, cake filtration at the inlet and deep bed filtration throughout the entire porous medium, are studied by different models. A unified approach for the transport and deposition of particles based on the deep bed filtration model is proposed. A variable suspension flow rate, proportional to the number of free pores at the inlet of the porous medium, is considered. To model cake filtration, this flow rate is introduced into the mass balance equation of deep bed filtration. For the cake filtration without deposit erosion,the suspension flow rate decreases to zero, and the suspension does not penetrate deep into the porous medium. In the case of the cake filtration with erosion, the suspension flow rate is nonzero, and the deposit is distributed throughout the entire porous medium. An exact solution is obtained for a constant filtration function. The method of characteristics is used to construct the asymptotics of the concentration front of suspended and retained particles for a filtration function in a general form. Explicit formulae are obtained for a linear filtration function. The properties of these solutions are studied in detail. 展开更多
关键词 deep bed filtration cake filtration porous medium particle deposition and erosion analytical solution concentration front
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Ablation behaviour and mechanical performance of ZrB_(2)-ZrC-SiC modified carbon/carbon composites prepared by vacuum infiltration combined with reactive melt infiltration
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作者 ZHANG Jia-ping SU Xiao-xuan +2 位作者 LI Xin-gang WANG Run-ning FU Qian-gang 《新型炭材料(中英文)》 SCIE EI CAS CSCD 北大核心 2024年第4期633-644,共12页
The development of advanced aircraft relies on high performance thermal-structural materials,and carbon/carbon com-posites(C/C)composited with ultrahigh-temperature ceramics are ideal candidates.However,the traditiona... The development of advanced aircraft relies on high performance thermal-structural materials,and carbon/carbon com-posites(C/C)composited with ultrahigh-temperature ceramics are ideal candidates.However,the traditional routes of compositing are either inefficient and expensive or lead to a non-uniform distribution of ceramics in the matrix.Compared with the traditional C/C-ZrC-SiC composites prepared by the reactive melt infiltration of ZrSi_(2),C/C-ZrB_(2)-ZrC-SiC composites prepared by the vacuum infiltration of ZrB_(2) combined with reactive melt infiltration have the higher content and more uniform distribution of the introduced ceramic phases.The mass and linear ablation rates of the C/C-ZrB_(2)-ZrC-SiC composites were respectively 68.9%and 29.7%lower than those of C/C-ZrC-SiC composites prepared by reactive melt infiltration.The ablation performance was improved because the volatilization of B_(2)O_(3),removes some of the heat,and the more uniformly distributed ZrO_(2),that helps produce a ZrO2-SiO2 continu-ous protective layer,hinders oxygen infiltration and decreases ablation. 展开更多
关键词 C/C composites ZrB_(2)-ZrC-SiC Vacuum filtration Reactive melt infiltration Ablation.
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Changes in filtration and capacitance properties of highly porous reservoir in underground gas storage:CT-based and geomechanical modeling
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作者 Valerii Khimulia Vladimir Karev +1 位作者 Yury Kovalenko Svyatoslav Barkov 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第8期2982-2995,共14页
The paper presents the results of comprehensive studies of filtration and capacitance properties of highly porous reservoir rocks of the aquifer of an underground gas storage facility.The geomechanical part of the res... The paper presents the results of comprehensive studies of filtration and capacitance properties of highly porous reservoir rocks of the aquifer of an underground gas storage facility.The geomechanical part of the research included studying the dependence of rock permeability on the stress-strain state in the vicinity of the wells,and physical modeling of the implementation of the method of increasing the permeability of the wellbore zone-the method of directional unloading of the reservoir.The digital part of the research included computed tomography(CT)-based computer analysis of the internal structure,pore space characteristics,and filtration properties before and after the tests.According to the results of physical modeling of deformation and filtration processes,it is found that the permeability of rocks before fracture depends on the stress-strain state insignificantly,and this influence is reversible.However,when downhole pressure reaches 7-8 MPa,macrocracks in the rock begin to grow,accompanied by irreversible permeability increase.Porosity,geodesic tortuosity and permeability values were obtained based on digital studies and numerical modeling.A weak degree of transversal anisotropy of the filtration properties of rocks was detected.Based on the analysis of pore size distribution,pressure field and flow velocities,high homogeneity and connectivity of the rock pore space is shown.The absence of pronounced changes in pore space characteristics and pore permeability after non-uniform triaxial loading rocks was shown.On the basis of geometrical analysis of pore space,the reasons for weak permeability anisotropy were identified.The filtration-capacitance properties obtained from the digital analysis showed very good agreement with the results of field and laboratory measurements.The physical modeling has confirmed the efficiency of application of the directional unloading method for the reservoir under study.The necessary parameters of its application were calculated:bottomhole geometry,stage of operation,stresses and pressure drawdown value. 展开更多
关键词 Permeability anisotropy Reservoir porosity Rocks computed tomography(CT) Digital core analysis filtration flow numerical modeling
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Leukocyte depletion filtration on systemic inflammatory response in patients undergoing valve surgery
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作者 章晓华 《外科研究与新技术》 2005年第3期195-196,共2页
To evaluate the effects of leucocyte-depleting filtration on systemic inflammatory response in patients undergoing valve surgery.Methods Fifty-two patients underwent elective mitral valve or mitral and aortic valves r... To evaluate the effects of leucocyte-depleting filtration on systemic inflammatory response in patients undergoing valve surgery.Methods Fifty-two patients underwent elective mitral valve or mitral and aortic valves replacement surgery in this study.Patients were randomly divided into two groups.Each group (n=26) was placed on the same cardiopulmonary bypass (CPB) circuit except for the arterial line filter.One group of patients (CG) used the TERUMO ordinary arterial line filter as a control,and the Pall LG-6 leucocyte-depleting arterial line filter and TERUMO ordinary arterial line filter were incorporated into the arterial line of extracorporeal circuit in a parallel way in the EG.The leukocyte-depleting filters were used from 5-10 minutes before aortic cross clamp release to the end of CPB.Intra- and postoperative variables consist of leucocyte counts,serum levels of cytokines and complement C3,body temperature and the usage of antibiotics.Statistical analysis with indepent-samples t-tests,paired-samples t-test,correlate and chi-square (SPSS11.5) was performed on all data to test for significan differences.A P value of <0.05 was considered significant.Results The counts of leucocyte,neutrophil and monocyte were reduced significantly before cardiopulmonary reperfusion in the patients undergoing leucocyte-depleting filtration.Serum levels of IL-6 between the two groups were similar at all time points.Serum levels of IL-8 were significantly elevated in the patients undergoing leucocyte depletion at pre-decrossclamping and 15 minutes reperfusion (P<0.01 and <0.05).Serum level of TNFα was significantly elevated (P<0.05) in the EG at pre-decrossclamping compared to the CG.No significant differences in serum levels of complement C3 were detected between the two groups at all time points observed.No difference in the usage of antibiotics between the two groups.Conclusion Leucocyte depletion filtration before and during reperfusion did not affect inflammatory parameters.14 refs.1 tab. 展开更多
关键词 VALVE filtration depletion
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Detection of decline in estimated glomerular filtration rate in patients with type 2 diabetes by cystatin C-based equations
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作者 Tam Thai Thanh Tran Tien Kim Ha +2 位作者 Nhut Minh Phan Minh Van Le Tin Hoang Nguyen 《World Journal of Nephrology》 2024年第4期103-116,共14页
BACKGROUND Aging population is a significant issue in Viet Nam and across the globe.Elderly individuals are at higher risk of chronic kidney disease(CKD),especially those with diabetes.Several studies found that the e... BACKGROUND Aging population is a significant issue in Viet Nam and across the globe.Elderly individuals are at higher risk of chronic kidney disease(CKD),especially those with diabetes.Several studies found that the estimated glomerular filtration rate(eGFR)determined using creatinine-based equations was not as accurate as that determined using cystatin C-based equations.Cystatin C-based equations may be beneficial in elderly patients with an age-associated decline in kidney function.Early determination of eGFR decline and associated factors would aid in appropriate interventions to improve kidney function in elderly patients with diabetes.AIM To determine the utility of cystatin C-based equations in early detection of eGFR decline and to explore factors associated with eGFR decline in elderly patients with diabetes.METHODS This cross-sectional study included 93 participants aged≥60 years evaluated in Can Tho University of Medicine and Pharmacy Hospital between October 2022 and July 2023,including 47 and 46 participants with and without diabetes respectively,according to the American Diabetes Association criteria for diabetes.The kappa coefficient,Student’s t,Mann-Whitney,χ2,Pearson’s correlation,multivariate logistic regression,and multiple linear regression analyses were employed.RESULTS The eGFRs were lower with the cystatin C-based equations than with the creatinine-based equations.Good agreement was found between the Modification of Diet in Renal Disease(MDRD)and CKD Epidemiology Collaboration(CKD-EPI)2021 creatinine-cystatin C equations(kappa=0.66).In the diabetes group,30%of the participants had low eGFR.Both plasma glucose and glycated hemoglobin were associated with an increased risk of eGFR decline(P<0.05)and negatively correlated with eGFR(P=0.001).By multivariate logistic regression,total cholesterol,and exercise were independently associated with low eGFR.By multiple linear regression,higher plasma glucose levels were correlated with lower eGFR(P=0.026,r=-0.366).CONCLUSION Cystatin C-based equations were superior in the early detection of a decline in eGFR,and the MDRD equation may be considered as an alternative to the CKD-EPI 2021 creatinine-cystatin C equation.Exercise,plasma glucose,and total cholesterol were independently associated with eGFR in patients with diabetes. 展开更多
关键词 Cystatin C Estimated glomerular filtration rate ELDERLY DIABETES NEPHROLOGY Kidney function
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Gel Filtration Chromatography Combined with Bradford Method for Determination of Total Residual Protein in Ferment Antibiotics 被引量:6
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作者 许明哲 马仕洪 胡昌勤 《Journal of Chinese Pharmaceutical Sciences》 CAS 2004年第4期262-266,共5页
Aim A novel method has been developed for evaluation of the levels of total residual protein in antibiotics produced by fermentation using gel filtration chromatography (GFC) combined with Bradford assay based on dete... Aim A novel method has been developed for evaluation of the levels of total residual protein in antibiotics produced by fermentation using gel filtration chromatography (GFC) combined with Bradford assay based on determination of residual protein in lincomycin hydrochloride. Methods The chromatographic conditions were SuperdexTM peptide column, 0.01 mol*L-1 phosphate buffer solution as mobile phase, and flow rate of 1 mL·min-1. Five hundred microliters of lincomycin hydrochloride solution (3 g of lincomycin hydrochloride dissolved in 10 mL of mobile phase) was injected into the chromatograph and the eluted solution was collected between 6 min and 14.5 min (protein eluted from column within this period), and the residual content of total protein in the eluted solution was assayed using Bradford assay method. Results The average recovery was more than 90% for bovine serum albumin, the calibration equation for the range of 0-12 μg·mL-1 of protein was y=-0.002 4x2+0.064 2x+0.002 9, r2=0.999 9, RSD=0.1%-0.9%, and the LOD and LOQ were 3 and 10 ng·mL-1 of protein, respectively. Conclusion The novel method for determining the residual protein in ferment antibio-tics is simple, rapid, and precise. 展开更多
关键词 Gel filtration chromatography bradford assay residual protein ferment antibiotics lincomycin hydrochloride
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Machine learning applications in healthcare clinical practice and research
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作者 Nikolaos-Achilleas Arkoudis Stavros P Papadakos 《World Journal of Clinical Cases》 SCIE 2025年第1期16-21,共6页
Machine learning(ML)is a type of artificial intelligence that assists computers in the acquisition of knowledge through data analysis,thus creating machines that can complete tasks otherwise requiring human intelligen... Machine learning(ML)is a type of artificial intelligence that assists computers in the acquisition of knowledge through data analysis,thus creating machines that can complete tasks otherwise requiring human intelligence.Among its various applications,it has proven groundbreaking in healthcare as well,both in clinical practice and research.In this editorial,we succinctly introduce ML applications and present a study,featured in the latest issue of the World Journal of Clinical Cases.The authors of this study conducted an analysis using both multiple linear regression(MLR)and ML methods to investigate the significant factors that may impact the estimated glomerular filtration rate in healthy women with and without non-alcoholic fatty liver disease(NAFLD).Their results implicated age as the most important determining factor in both groups,followed by lactic dehydrogenase,uric acid,forced expiratory volume in one second,and albumin.In addition,for the NAFLD-group,the 5th and 6th most important impact factors were thyroid-stimulating hormone and systolic blood pressure,as compared to plasma calcium and body fat for the NAFLD+group.However,the study's distinctive contribution lies in its adoption of ML methodologies,showcasing their superiority over traditional statistical approaches(herein MLR),thereby highlighting the potential of ML to represent an invaluable advanced adjunct tool in clinical practice and research. 展开更多
关键词 Machine Learning Artificial INTELLIGENCE CLINICAL Practice RESEARCH Glomerular filtration rate Non-alcoholic fatty liver disease MEDICINE
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Responses of Filtration Rate of Freshwater Mussel Anodonta woodiana to Ambient Ammonia Concentration
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作者 葛长字 秦耿 彭小经 《Agricultural Science & Technology》 CAS 2010年第2期179-182,共4页
By using one static water system,the filtration rates of one kind of freshwater mussel Anodonta woodiana with different body weight(accounted by dry weight of soft tissue)were studied under semi-field conditions.Durin... By using one static water system,the filtration rates of one kind of freshwater mussel Anodonta woodiana with different body weight(accounted by dry weight of soft tissue)were studied under semi-field conditions.During the experiments,the water temperature and the suspended particulate matters concentration were kept relative invariable and there were four ambient ammonia concentration levels.The ambient water ammonia concentration was obtained by the excretion of the freshwater mussel and the accession of ... 展开更多
关键词 Semi-field experiment Ammonia concentration Dry weight of soft tissue Anodonta woodiana filtration rate
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