BACKGROUND Gastric cancer(GC)is a prevalent malignancy with a substantial health burden and high mortality rate,despite advances in prevention,early detection,and treatment.Compared with the global average,Asia,notabl...BACKGROUND Gastric cancer(GC)is a prevalent malignancy with a substantial health burden and high mortality rate,despite advances in prevention,early detection,and treatment.Compared with the global average,Asia,notably China,reports disproportionately high GC incidences.The disease often progresses asymptoma-tically in the early stages,leading to delayed diagnosis and compromised out-comes.Thus,it is crucial to identify early diagnostic biomarkers and enhance treatment strategies to improve patient outcomes and reduce mortality.METHODS Retrospectively analyzed the clinical data of 148 patients with GC treated at the Civil Aviation Shanghai Hospital between December 2022 and December 2023.The associations of coagulation indices-partial thromboplastin time(APTT),prothrombin time(PT),thrombin time(TT),fibrinogen,fibrinogen degradation products(FDP),fasting blood glucose,and D-dimer(D-D)with TNM stage and distant metastasis were examined.RESULTS Prolongation of APTT,PT,and TT was significantly correlated with the GC TNM stage.Hence,abnormal coagulation system activation was closely related to disease progression.Elevated FDP and D-D were significantly associated with distant metastasis in GC(P<0.05),suggesting that increased fibrinolytic activity contributes to increased metastatic risk.CONCLUSION Our Results reveal coagulation indices,FDPs as GC biomarkers,reflecting abnormal coagulation/fibrinolysis,aiding disease progression,metastasis prediction,and helping clinicians assess thrombotic risk for early intervention and personalized treatment plans.展开更多
Gastric cancer(GC)has remained one of the leading causes of cancer-related deaths globally.The development of noninvasive biomarkers in cancer diagnosis and treatment has gained substantial traction in recent years.Re...Gastric cancer(GC)has remained one of the leading causes of cancer-related deaths globally.The development of noninvasive biomarkers in cancer diagnosis and treatment has gained substantial traction in recent years.Recent evidence highlights hypercoagulation as a promising prognostic biomarker,particularly in locally advanced GC(LAGC)who underwent radical resection after neoadjuvant immunochemotherapy(NICT).A recent study by Li et al showed that hypercoagulation is a valuable prognostic indicator for patients with LAGC who have undergone radical resection following NICT.While the study addresses an important clinical issue and provides insightful findings,the present study offered valuable insights;the applicability of these findings was constrained by the retrospective design,the focus on a single center,and the small sample size of the existing studies.Additionally,vital confounders,such as preoperative comorbidities and systemic inflammation,are inadequately addressed.Future studies should focus on prospective multicenter trials,incorporating advanced predictive models such as machine learning algorithms to integrate coagulation markers with other clinical variables for personalized risk stratification.In addition,we are required to validate findings to examine the biological mechanisms correlating hypercoagulation to tumor progression.Integrating machine learning,comprehensive biomarker panels,and real-world data would allow the researchers to have personalized risk stratification,improve predictive accuracy,and optimize clinical decision-making.Finally,A multidisciplinary approach,including lifestyle interventions and imaging modalities,is essential to improve outcomes among patients with GC.展开更多
As part of sewage treatment,coagulation could remove phosphorus from the effluent of the Anaerobic-Anoxic-Oxic-Anoxic(A^(2)OA)biological process.The importance in investigating the influence of coagulation on Anaerobi...As part of sewage treatment,coagulation could remove phosphorus from the effluent of the Anaerobic-Anoxic-Oxic-Anoxic(A^(2)OA)biological process.The importance in investigating the influence of coagulation on Anaerobic-Anoxic-Oxic-Anoxic Membrane Bioreactor(A^(2)OA-MBR)should be emphasized.In this study,systematic optimization of coagulation parameters for greater pollutant removal was conducted in terms of coagulant dosage,coagulation residence time and stirring hydraulic conditions.Coagulation process could remarkably remove turbidity,phosphorus,chemical oxygen demand,humic-like,protein-like and polysaccharide-like substances from secondary effluent and A^(2)OA sludge-liquid mixture.Furthermore,the influence of coagulation on membrane fouling development during the ultrafiltration of secondary effluent and A^(2)OA sludge-liquid mixture was investigated based on optimum coagulation parameters.Coagulation simultaneously reduced reversible membrane fouling and the irreversible one by 86%and 16%,respectively.According to excitation-emission matrix and attenuated total reflection-fourier transform infrared spectra,membrane fouling was primarily influenced by the cake layer,although pore fouling might be aggravated by A^(2)OA processes.Besides,the feasibility of coagulation-assisted A^(2)OA-MBRwas also assessed using hollowfibermembranes.It exhibited excellent potential in alleviatingmembrane fouling,while regular cleaning twice a day was not enough to suppress transmembrane pressure increase during direct domestic wastewater ultrafiltration.Additionally,both polysaccharide-like and protein-like foulants were vital components for membrane fouling during wastewater treatment.展开更多
BACKGROUND:This study aimed to explore the importance of routine coagulation tests for the early detection of sepsis and to quickly identify patients at a high risk of mortality.METHODS:This retrospective single-cente...BACKGROUND:This study aimed to explore the importance of routine coagulation tests for the early detection of sepsis and to quickly identify patients at a high risk of mortality.METHODS:This retrospective single-center study collected data from patients meeting the clinical criteria for systemic inflammatory response syndrome(SIRS) with a confirmed infection source.Patients with coagulation disorders or on medications affecting coagulation were excluded.Patients were divided into sepsis and non-sepsis groups based on a Sequential Organ Failure Assessment(SOFA) score of ≥2.Univariate and multivariate logistic regression identified indicators from routine coagulation tests that predict sepsis.Prognostic roles of coagulation indicators were analyzed within the sepsis group.RESULTS:A total of 512 patients were included,with 396 in the sepsis group and 116 in the non-sepsis group.The predictive factors in the sepsis prediction model encompass fibrin degradation products(FDP),D-dimer,lactate,procalcitonin(PCT) levels and the utilization of mechanical ventilation.Early elevation of FDP and D-dimer levels predicted sepsis onset.The model exhibited an area under the curve(AUC) of 0.943(95% CI:0.923–0.963).In the sepsis group,Cox regression analysis revealed an association between prothrombin time(PT) and in-hospital mortality.CONCLUSION:Abnormal high FDP and D-dimer levels in the early stages of sepsis provide a supplementary method for predicting sepsis.As the disease progresses,prolonged PT in the early stages of sepsis suggests a poor prognosis.展开更多
BACKGROUND Botulinum toxin(BoNT)is a bacterial poison that acts by blocking the release of acetylcholine-containing vesicles at the neuromuscular junction.Notably,a mild amount of BoNT is known to exert therapeutic be...BACKGROUND Botulinum toxin(BoNT)is a bacterial poison that acts by blocking the release of acetylcholine-containing vesicles at the neuromuscular junction.Notably,a mild amount of BoNT is known to exert therapeutic benefits against various diseases,including migraine,movement disorders,anxiety and neurocognitive deficits.BoNT treatment appears to increase platelet count in circulation.Therefore,BoNT treatment may be associated with the regulation of blood coagulation upon haemorrhagic events.However,the effects of BoNT on the degree of bleeding and clotting events have not yet been determined.AIM To investigate the effect of BoNT on the bleeding parameters and blood coagulation events in experimental mice.METHODS A group of 7-8-month-old mice was intramuscularly injected with a mild single dose of BoNT.After a month of BoNT injection,animals were subjected to tail bleeding assay,assessment of clotting time,and degree of platelet aggregation in comparison with the control group.RESULTS Results revealed that BoNT injection significantly reduced blood loss and bleeding time in experimental aging mice upon tail tip transection.Moreover,the blood samples collected from the BoNT-treated mice showed enhanced platelet aggregation and intense formation of the fibrin clot compared to the control.This study indicates a putative therapeutic value of BoNT in mitigating bleeding episodes,possibly through its platelet-enhancing property.CONCLUSION BoNT treatment effectively facilitates blood coagulation.Upon further validation,this approach can be translated to treat traumatic blood vessel injuries,haemorrhagic diseases,and bleeding complications associated with surgical procedures.展开更多
This letter to the editor involves the article published in the World Journal of Gastrointestinal Oncology.Bone metastasis(BM)in gastric cancer(GC)is uncommon but can be prevalent in autopsy studies.BM significantly i...This letter to the editor involves the article published in the World Journal of Gastrointestinal Oncology.Bone metastasis(BM)in gastric cancer(GC)is uncommon but can be prevalent in autopsy studies.BM significantly impairs quality of life and is frequently underdiagnosed,as sensitive diagnostic tests are only performed after symptoms occur.Imaging is crucial for the diagnosis of BM but is not routinely used for screening and is expensive.Examining laboratory risk factors for BM in GC patients using multivariate analysis could be a more effective approach.展开更多
BACKGROUND Coagulation status is closely related to the progression of malignant tumors.In the era of neoadjuvant immunochemotherapy(NICT),the prognostic utility of coagulation indicators in patients with locally adva...BACKGROUND Coagulation status is closely related to the progression of malignant tumors.In the era of neoadjuvant immunochemotherapy(NICT),the prognostic utility of coagulation indicators in patients with locally advanced gastric cancer(LAGC)undergoing new treatments remains to be determined.AIM To determine whether hypercoagulation is an effective prognostic indicator in patients with LAGC who underwent radical resection after NICT.METHODS A retrospective analysis of clinical data from 104 patients with LAGC,who underwent radical resection after NICT between 2020 and 2023,was performed.Ddimer and fibrinogen concentrations were measured one week before NICT,and again one week before surgery,to analyze the association between these two indicators and their combined indices[non-hypercoagulation(D-dimer and fibrinogen concentrations within the upper limit of normal)vs hypercoagulation(D-dimer or fibrinogen concentrations above the upper limit of normal)]with prognosis.After radical resection,patients were followed-up periodically.The median follow-up duration was 21 months.RESULTS Data collected after NICT revealed that the three-year overall survival(OS)and disease-free survival(DFS)rates the non-hypercoagulation group were significantly better than those in the hypercoagulation group[94.4%vs 78.0%(P=0.019)and 87.0%vs 68.0%(P=0.027),respectively].Multivariate analysis indicated that hypercoagulation after NICT was an independent factor for poor postoperative OS[hazard ratio(HR)4.436,P=0.023]and DFS(HR 2.551,P=0.039).Pre-NICT data demonstrated no statistically significant difference in three-year OS between the non-hypercoagulation and hypercoagulation groups(88.3%vs 84.1%,respectively;P=0.443).CONCLUSION Hypercoagulation after NICT is an effective prognostic indicator in patients with LAGC undergoing radical gastrectomy.展开更多
BACKGROUND Currently,there is a notable lack of reliable studies evaluating the impact of multidisciplinary treatment strategies following transarterial chemoembolization(TACE)on patients with hepatocellular carcinoma...BACKGROUND Currently,there is a notable lack of reliable studies evaluating the impact of multidisciplinary treatment strategies following transarterial chemoembolization(TACE)on patients with hepatocellular carcinoma(HCC),underscoring the urgent need for higher-level research in this area.AIM To investigate the association of multidisciplinary treatment strategies with the immunological,coagulation,and tumor biomarker responses after post-TACE in HCC.METHODS This retrospective analysis included 100 patients with HCC who were categorized based on the treatment approach into the control(patients treated with TACE alone)and experimental groups(patients receiving multidisciplinary treatment strategies post-TACE).Participant characteristics,short-term efficacy,and safety assessment as well as immunological,coagulation,and tumor biomarker res-ponses between the two groups were collected and compared.RESULTS Compared with the control group,the experimental group demonstrated a superior overall response rate,along with an increased fibrinogen,markedly improved immunological biomarker,lower prothrombin time,thrombin time,alpha-fetoprotein,carcinoembryonic antigen,and carbohydrate antigen 199 levels,as well as a decreased abnormal prothrombin incidence,and a lower overall rate of adverse reactions.Notably,no significant difference in the activated partial thromboplastin time and D-dimer levels was observed between the two groups.CONCLUSION Multidisciplinary treatment strategies post-TACE have improved the treatment outcome,the immunological response,and the coagulation function,lowered the tumor biomarker response levels,and reduced the risk of adverse reactions in patients with HCC.展开更多
BACKGROUND Colon polyps represent a significant clinical challenge in elderly patients.While endoscopic mucosal resection(EMR)and argon plasma coagulation(APC)are widely used,their comparative effectiveness in elderly...BACKGROUND Colon polyps represent a significant clinical challenge in elderly patients.While endoscopic mucosal resection(EMR)and argon plasma coagulation(APC)are widely used,their comparative effectiveness in elderly populations remains unclear,particularly regarding postoperative recovery and complication profiles.AIM To compare the postoperative recovery,complications and efficacy of EMR and APC in elderly patients with colonic polyps.METHODS We retrospectively analyzed clinical data from 224 elderly patients with colon polyps treated at our center between January 2021 and July 2024.All patients were divided into the EMR group and APC group according to the surgical method they received.By comparing the operation time,intraoperative bleeding situation,hospital stays,postoperative inflammatory response index,complication rate and recurrence status of the two groups,the effect of the two surgical methods was comprehensively evaluated.RESULTS The APC group exhibited superior outcomes in terms of operative time(10.63 minutes vs 13.27 minutes,P<0.001),intraoperative bleeding situation(39.00%vs 52.42%,P=0.031),and length of hospital stay(1.63 days vs 3.87 days,P<0.001)compared to the EMR group.The one-time resection rate of the APC group(94.69%)was higher than that of the EMR group(89.14%)(P=0.026).The overall effective rates of the two groups were 94.35%and 92.00%,respectively.Postoperative procalcitonin and C-reactive protein levels were lower in the APC group than in the EMR group(P<0.001).The incidence of complications was comparable between the two groups(P=0.159).The recurrence rate was lower in the APC group(2.00%)than in the EMR group(8.06%)(P=0.045).CONCLUSION For elderly patients with colon polyps,APC showed certain advantages compared with EMR in promoting postoperative recovery,reducing the inflammatory response and the risk of complications.However,the study is limited by its single-center retrospective design and short follow-up period,and further multicenter prospective studies are needed to validate the findings.展开更多
The accurate and timely detection of biochemical coagulation indicators is pivotal in pulmonary and critical care medicine.Despite their reliability,traditional laboratories often lag in terms of rapid diagnosis.Point...The accurate and timely detection of biochemical coagulation indicators is pivotal in pulmonary and critical care medicine.Despite their reliability,traditional laboratories often lag in terms of rapid diagnosis.Point-of-care testing(POCT)has emerged as a promising alternative,which is awaiting rigorous validation.We assessed 226 samples from patients at the First Affiliated Hospital of Guangzhou Medical University using a Beckman Coulter AU5821 and a PUSHKANG POCT Biochemistry Analyzer MS100.Furthermore,350 samples were evaluated with a Stago coagulation analyzer STAR MAX and a PUSHKANG POCT Coagulation Analyzer MC100.Metrics included thirteen biochemical indexes,such as albumin,and five coagulation indices,such as prothrombin time.Comparisons were drawn against the PUSHKANG POCT analyzer.Bland-Altman plots(MS100:0.8206-0.9995;MC100:0.8318-0.9911)evinced significant consistency between methodologies.Spearman correlation pinpointed a potent linear association between conventional devices and the PUSHKANG POCT analyzer,further underscored by a robust correlation coefficient(MS100:0.713-0.949;MC100:0.593-0.950).The PUSHKANG POCT was validated as a dependable tool for serum and whole blood biochemical and coagulation diagnostics.This emphasizes its prospective clinical efficacy,offering clinicians a swift diagnostic tool and heralding a new era of enhanced patient care outcomes.展开更多
[Objective] The aim was to treat acidic wastewater containing thallium by enhanced coagulation oxidation process. [Method] Enhanced coagulation oxidation process was made use of to remove thallium in the acidic wastew...[Objective] The aim was to treat acidic wastewater containing thallium by enhanced coagulation oxidation process. [Method] Enhanced coagulation oxidation process was made use of to remove thallium in the acidic wastewater in the experiment under the condition of 0.05 kg/L of potassium permanganate, 30% hydrogen peroxide and 0.05 kg/L calcium hypochlorite as oxidant, together with 0.092 kg/L CaO as coagulation. [Result] The results showed that thallium removal efficiencies achieved 99.98%, 99.1% and 99.95% when dosages of KMnO4, H2O2and Ca（ClO）2were added at 20, 2.2 and 37 ml, respectively, under the condition of 30 ml 0.092kg/L CaO being dosed and 99.93%, 99.69% and 99.98% were achieved when different dosages of CaO were added at 25, 35 and 25 ml, under the condition of 20ml KMnO4, 2.2 ml H2O2and 37 ml Ca（ClO）2respectively. [Conclusion] The experiment demonstrates that good removal effects of removal thallium from the acidic wastewater would be achieved by enhanced coagulation oxidation process.展开更多
Snake venoms,especially those from the two subfamilies,Crotalinae and Viperinae,contained a lot of serine proteases. They were responsible for the hemorrhage,shock,or disorder of blood coagulation after envenomation. ...Snake venoms,especially those from the two subfamilies,Crotalinae and Viperinae,contained a lot of serine proteases. They were responsible for the hemorrhage,shock,or disorder of blood coagulation after envenomation. They acted,by activating,inactivating,or other converting effects,on almost all the components of hemostatic and fibrinolytic systems. Their sequences were homologous to trypsin-kallikrein serine proteases. Variation of primary sequences out of active center results in the difference of substrate specificities and the further difference of biological and pharmacological activities. Because of their common and unique properties compared to their physiological corresponding factors,snake venom proteases are proved to be an excellent model for the study of protease substrate discriminating mechanism. Furthermore,they have found an important position both in basic research and application of hemostasis and thrombosis in clinic.展开更多
Study on the coagulation of four species of red tide organisms (Nitzschia pungens, Skeletonema costatum, Prorocentrum minimum and Noctiluca scintillans) with montmorillonite, and the effect of montmorillonite pretrea...Study on the coagulation of four species of red tide organisms (Nitzschia pungens, Skeletonema costatum, Prorocentrum minimum and Noctiluca scintillans) with montmorillonite, and the effect of montmorillonite pretreatment on the coagulation shows that the capability for montmorillonite to coagulate with them is in the order: N. pungens > S. costatum > P. minimum > N. scintillans. The coagulation is discussed from the aspects of the structure, shape, size, movement, habit, etc. of different species and the results are explained theoretically. The experimental results also indicate that the treatment of montmorillonite with acid can enhance its coagulating capability. This is due to the fact that A1(OH2)6+3, exchanged from the clay lattice by hydrogen ion H+, forms hydroxy-aluminum polymers on the surface of the montmorillonite. The hydroxy-aluminum polymers positively charge and increase the positive characteristic of the clay surface, and also serves as a bridge between adjacent surfaces of particles. These two functions enhance the montmorillonite's capability for coagulating with the organism cells.展开更多
Objective: To evaluate the efficacy and safety of percutaneous microwave coagulation therapy (PMCT) for patients with primary and metastatic hepatic tumors.Methods: The enrolled 100 patients with 186 tumor nodules who...Objective: To evaluate the efficacy and safety of percutaneous microwave coagulation therapy (PMCT) for patients with primary and metastatic hepatic tumors.Methods: The enrolled 100 patients with 186 tumor nodules who underwent PMCT included 79 cases of primary or recurrent liver cancers and 21 cases of metastatic liver cancer. The tumors were divided into two groups according to the tumor size in diameter: group A, 0.5 cm?<3 cm; group B, ≥3 cm?<5 cm. Under local and/or epidural anesthesia, a single percutaneous microwave antenna (or two antennas array applicator) was inserted directly into the tumor in the liver for thermo-coagulation with the aid of ultrasound guidance.Results: Among the 186 lesions in 100 patients with primary and metastatic liver cancers, in group A, 123 (66%) were coagulated once. A Follow-up of 6–12 months demonstrated that 112 lesions (91%) showed no local recurrence by CT or MRI; In group B, of the 63 lesions (33.87%) coagulated twice, 31 (49%) showed no local recurrence by CT or MRI during a follow-up of 6 months. There were no serious clinical side effects or complications in all the PMCT patients.Conclusion: PMCT gives satisfactory curative effect on tumors with <3 cm in size. It is partly effective on lesions ≥3 cm?<5 cm in size. It is a minimally invasive and effective therapy, can be used safely in the field of percutaneous hepatis surgery, and carried out even in patients with poor liver function. Key words hepatocellular carcinoma - microwave - coagulation - therapy展开更多
目的探讨缩宫素联合垂体后叶素对宫缩乏力性产后出血患者纤溶、凝血功能的影响。方法便利抽样法选取2019年1月至2023年8月宫缩乏力性产后出血患者52例,按照随机数字表发分组即对照组和观察组,每组均26例,对照组使用缩宫素治疗,研究组采...目的探讨缩宫素联合垂体后叶素对宫缩乏力性产后出血患者纤溶、凝血功能的影响。方法便利抽样法选取2019年1月至2023年8月宫缩乏力性产后出血患者52例,按照随机数字表发分组即对照组和观察组,每组均26例,对照组使用缩宫素治疗,研究组采用缩宫素联合垂体后叶素的治疗方案,统计两组产后出血量、凝血功能指标、临床疗效、不良反应。结果观察组产后2h出血量(238.24±36.25 mL vs 279.32±42.71mL,t=3.739,P=0.001)、产后24h出血量(569.23±28.15mL vs 621.22±41.33mL,t=5.301,P<0.001)均显著低于对照组,且止血时间更短(21.11±3.22min vs 29.23±3.61min,t=8.559,P<0.001)。治疗后,观察组凝血酶时间(TT)、凝血酶原时间(PT)、活化部分凝血活酶时间(APTT)、D-二聚体(D-D)及纤维蛋白原(Fib)的改善差值均显著高于对照组(均P<0.001)。观察组临床总有效率为96.15%(25/26),显著高于对照组的76.92%(20/26)(χ^(2)=4.127,P=0.042)。两组不良反应总发生率比较,差异无统计学意义(23.08%vs15.38%,χ^(2)=0.495,P=0.482)。结论对于宫缩乏力性产后出血患者,在缩宫素基础上联合应用垂体后叶素,能更有效地减少产后出血量、缩短止血时间,并显著改善患者的纤溶与凝血功能,临床疗效确切,且未显著增加不良反应,安全性良好。展开更多
The Brownian coagulation of nanoparticles with initial bimodal size distribution, i.e., mode i and j, is numerically studied using the moment method. Evolutions of particle number concentration, geometric average diam...The Brownian coagulation of nanoparticles with initial bimodal size distribution, i.e., mode i and j, is numerically studied using the moment method. Evolutions of particle number concentration, geometric average diameter and geometric standard deviation are given in the free molecular regime, the continuum regime, the free molecular regime and transition regime, the free molecular regime and continuum regime, respectively. The results show that, both in the free molecular regime and the continuum regime, the num- ber concentration of mode i and j decreases with increasing time. The evolutions of particle geometric average diameter with different initial size distribution are quite different. Both intra-modal and inter-modal coagulation finally make the polydispersed size distribution become monodispersed. As time goes by, the size distribution with initial bimodal turns to be unimoda/and shifts to a larger particle size range. In the free molecular regime and transition regime, the inter- modal coagulation becomes dominant when the number concentrations of mode i and j are of the same order. The effects of the number concentration of mode i and mode j on the evolution of geometric average diameter of mode j are negligible, while the effects of the number concentration of mode j on the evolution of geometric average diameter of mode j is distinct. In the free molecular regime and continuum regime, the higher the initial number concentration of mode j, the more obvious the variation of the number concentration of mode i.展开更多
Cyclovirobuxine D （CVB-D） is a compound extracted from Chinese traditional plant Buxus microphylla, which has been used for treating arrhythmia and myocardial ischemia in China. In this study, we investigated its ef...Cyclovirobuxine D （CVB-D） is a compound extracted from Chinese traditional plant Buxus microphylla, which has been used for treating arrhythmia and myocardial ischemia in China. In this study, we investigated its effect on blood coagulation and thrombotic formation in mouse and rat models. The doses of CVB-D used in this study （5-20 mg/kg） prolonged clotting time （CT） in a dose-dependent manner （P〈0.01）. It also significantly prolonged thrombin time （TT）, prothrombin time （PT） and activated partial thromboplast time （aPTT） （P〈0.05 or P〈0.01） at the doses of 10-20 mg/kg. CVB-D did not affect the bleeding time （BT） compared with the control group, while warfarin significantly prolonged the bleeding time. CVB-D at the doses of 5-20 mg/kg reduced wet weight of thrombosis （P〈0.01）. This study demonstrated the anti-coagulation effect and anti-thrombosis effect of orally administered CVB-D without substantially increasing bleeding. These findings suggest that CVB-D probably can be used as an oral anti-coagulant in addition to its current applications.展开更多
A composite control scheme consisting of modepredictive control （MPC） and disturbance observer （DOB） iproposed to solve the control performance degradationproblem of the turbidity of the treated water in the prese...A composite control scheme consisting of modepredictive control （MPC） and disturbance observer （DOB） iproposed to solve the control performance degradationproblem of the turbidity of the treated water in the presence osignificant changes in raw water quality, water flow rate andinternal model mismatch disturbances. The MPC is employedas a feedback controller for the coagulation process with alarge time delay. The DOB is adopted to estimate the severedisturbances in the turbidity control, such as large changes inraw water quality and water flow rate. The estimated valuesare applied for feed-forward compensation to rejecdisturbances. Finally, the disturbance rejection performancesfor step disturbances and time-varying disturbances in thenominal case and model mismatch case are tested. Thesimulation results illustrate that, compared with the MPCmethod, the proposed method can significantly improve thedisturbance rejection performance in the turbidity control othe treated water, no matter if in the presence of externadisturbances or internal model mismatch disturbances.展开更多
文摘BACKGROUND Gastric cancer(GC)is a prevalent malignancy with a substantial health burden and high mortality rate,despite advances in prevention,early detection,and treatment.Compared with the global average,Asia,notably China,reports disproportionately high GC incidences.The disease often progresses asymptoma-tically in the early stages,leading to delayed diagnosis and compromised out-comes.Thus,it is crucial to identify early diagnostic biomarkers and enhance treatment strategies to improve patient outcomes and reduce mortality.METHODS Retrospectively analyzed the clinical data of 148 patients with GC treated at the Civil Aviation Shanghai Hospital between December 2022 and December 2023.The associations of coagulation indices-partial thromboplastin time(APTT),prothrombin time(PT),thrombin time(TT),fibrinogen,fibrinogen degradation products(FDP),fasting blood glucose,and D-dimer(D-D)with TNM stage and distant metastasis were examined.RESULTS Prolongation of APTT,PT,and TT was significantly correlated with the GC TNM stage.Hence,abnormal coagulation system activation was closely related to disease progression.Elevated FDP and D-D were significantly associated with distant metastasis in GC(P<0.05),suggesting that increased fibrinolytic activity contributes to increased metastatic risk.CONCLUSION Our Results reveal coagulation indices,FDPs as GC biomarkers,reflecting abnormal coagulation/fibrinolysis,aiding disease progression,metastasis prediction,and helping clinicians assess thrombotic risk for early intervention and personalized treatment plans.
文摘Gastric cancer(GC)has remained one of the leading causes of cancer-related deaths globally.The development of noninvasive biomarkers in cancer diagnosis and treatment has gained substantial traction in recent years.Recent evidence highlights hypercoagulation as a promising prognostic biomarker,particularly in locally advanced GC(LAGC)who underwent radical resection after neoadjuvant immunochemotherapy(NICT).A recent study by Li et al showed that hypercoagulation is a valuable prognostic indicator for patients with LAGC who have undergone radical resection following NICT.While the study addresses an important clinical issue and provides insightful findings,the present study offered valuable insights;the applicability of these findings was constrained by the retrospective design,the focus on a single center,and the small sample size of the existing studies.Additionally,vital confounders,such as preoperative comorbidities and systemic inflammation,are inadequately addressed.Future studies should focus on prospective multicenter trials,incorporating advanced predictive models such as machine learning algorithms to integrate coagulation markers with other clinical variables for personalized risk stratification.In addition,we are required to validate findings to examine the biological mechanisms correlating hypercoagulation to tumor progression.Integrating machine learning,comprehensive biomarker panels,and real-world data would allow the researchers to have personalized risk stratification,improve predictive accuracy,and optimize clinical decision-making.Finally,A multidisciplinary approach,including lifestyle interventions and imaging modalities,is essential to improve outcomes among patients with GC.
基金supported by the National Natural Science Foundation of China(Nos.52170070,52400022 and 52200088)the Youth S&T Talent Support Programme of Guangdong Provincial Association for Science and Technology(GDSTA)(No.SKXRC202406)+1 种基金China Postdoctoral Science Foundation(No.2023M740754)“One hundred Youth”Science and Technology Plan,Guangdong University of Technology,China(No.263113906).
文摘As part of sewage treatment,coagulation could remove phosphorus from the effluent of the Anaerobic-Anoxic-Oxic-Anoxic(A^(2)OA)biological process.The importance in investigating the influence of coagulation on Anaerobic-Anoxic-Oxic-Anoxic Membrane Bioreactor(A^(2)OA-MBR)should be emphasized.In this study,systematic optimization of coagulation parameters for greater pollutant removal was conducted in terms of coagulant dosage,coagulation residence time and stirring hydraulic conditions.Coagulation process could remarkably remove turbidity,phosphorus,chemical oxygen demand,humic-like,protein-like and polysaccharide-like substances from secondary effluent and A^(2)OA sludge-liquid mixture.Furthermore,the influence of coagulation on membrane fouling development during the ultrafiltration of secondary effluent and A^(2)OA sludge-liquid mixture was investigated based on optimum coagulation parameters.Coagulation simultaneously reduced reversible membrane fouling and the irreversible one by 86%and 16%,respectively.According to excitation-emission matrix and attenuated total reflection-fourier transform infrared spectra,membrane fouling was primarily influenced by the cake layer,although pore fouling might be aggravated by A^(2)OA processes.Besides,the feasibility of coagulation-assisted A^(2)OA-MBRwas also assessed using hollowfibermembranes.It exhibited excellent potential in alleviatingmembrane fouling,while regular cleaning twice a day was not enough to suppress transmembrane pressure increase during direct domestic wastewater ultrafiltration.Additionally,both polysaccharide-like and protein-like foulants were vital components for membrane fouling during wastewater treatment.
基金supported by the Science and Technology Commission of Shanghai Municipality (grant no.22Y11900300)China Primary Health Care Foundation (grant no.MTP2022A0132)Project of Shanghai Administration of Traditional Chinese Medicine (ZXXT-202213)to EQM and LM。
文摘BACKGROUND:This study aimed to explore the importance of routine coagulation tests for the early detection of sepsis and to quickly identify patients at a high risk of mortality.METHODS:This retrospective single-center study collected data from patients meeting the clinical criteria for systemic inflammatory response syndrome(SIRS) with a confirmed infection source.Patients with coagulation disorders or on medications affecting coagulation were excluded.Patients were divided into sepsis and non-sepsis groups based on a Sequential Organ Failure Assessment(SOFA) score of ≥2.Univariate and multivariate logistic regression identified indicators from routine coagulation tests that predict sepsis.Prognostic roles of coagulation indicators were analyzed within the sepsis group.RESULTS:A total of 512 patients were included,with 396 in the sepsis group and 116 in the non-sepsis group.The predictive factors in the sepsis prediction model encompass fibrin degradation products(FDP),D-dimer,lactate,procalcitonin(PCT) levels and the utilization of mechanical ventilation.Early elevation of FDP and D-dimer levels predicted sepsis onset.The model exhibited an area under the curve(AUC) of 0.943(95% CI:0.923–0.963).In the sepsis group,Cox regression analysis revealed an association between prothrombin time(PT) and in-hospital mortality.CONCLUSION:Abnormal high FDP and D-dimer levels in the early stages of sepsis provide a supplementary method for predicting sepsis.As the disease progresses,prolonged PT in the early stages of sepsis suggests a poor prognosis.
基金Supported by The Science and Engineering Research Board,No.SERB-EEQ/2016/000639The University Grants Commission-Faculty Recharge Programme(UGC-FRP),No.F4-5(97)/2014+2 种基金Rashtriya Uchchatar Shiksha Abhiyan(RUSA)2.0,Biological Sciences,Bharathidasan University,No.TN RUSA:311/RUSA(2.0)/2018Infrastructure of the Department of Animal Science,Bharathidasan University,UGC-SAP-DRS and DST-FISTand CSIR-SRF Direct,No.09/0475(23353)/2025-EMR-I.
文摘BACKGROUND Botulinum toxin(BoNT)is a bacterial poison that acts by blocking the release of acetylcholine-containing vesicles at the neuromuscular junction.Notably,a mild amount of BoNT is known to exert therapeutic benefits against various diseases,including migraine,movement disorders,anxiety and neurocognitive deficits.BoNT treatment appears to increase platelet count in circulation.Therefore,BoNT treatment may be associated with the regulation of blood coagulation upon haemorrhagic events.However,the effects of BoNT on the degree of bleeding and clotting events have not yet been determined.AIM To investigate the effect of BoNT on the bleeding parameters and blood coagulation events in experimental mice.METHODS A group of 7-8-month-old mice was intramuscularly injected with a mild single dose of BoNT.After a month of BoNT injection,animals were subjected to tail bleeding assay,assessment of clotting time,and degree of platelet aggregation in comparison with the control group.RESULTS Results revealed that BoNT injection significantly reduced blood loss and bleeding time in experimental aging mice upon tail tip transection.Moreover,the blood samples collected from the BoNT-treated mice showed enhanced platelet aggregation and intense formation of the fibrin clot compared to the control.This study indicates a putative therapeutic value of BoNT in mitigating bleeding episodes,possibly through its platelet-enhancing property.CONCLUSION BoNT treatment effectively facilitates blood coagulation.Upon further validation,this approach can be translated to treat traumatic blood vessel injuries,haemorrhagic diseases,and bleeding complications associated with surgical procedures.
文摘This letter to the editor involves the article published in the World Journal of Gastrointestinal Oncology.Bone metastasis(BM)in gastric cancer(GC)is uncommon but can be prevalent in autopsy studies.BM significantly impairs quality of life and is frequently underdiagnosed,as sensitive diagnostic tests are only performed after symptoms occur.Imaging is crucial for the diagnosis of BM but is not routinely used for screening and is expensive.Examining laboratory risk factors for BM in GC patients using multivariate analysis could be a more effective approach.
基金Natural Science Foundation of Hubei Province of China,No.2024AFB655Key Research and Development Program of Hubei Province of China,No.2021BCA116National Natural Science Foundation of China,No.82072736,No.82003205,No.
文摘BACKGROUND Coagulation status is closely related to the progression of malignant tumors.In the era of neoadjuvant immunochemotherapy(NICT),the prognostic utility of coagulation indicators in patients with locally advanced gastric cancer(LAGC)undergoing new treatments remains to be determined.AIM To determine whether hypercoagulation is an effective prognostic indicator in patients with LAGC who underwent radical resection after NICT.METHODS A retrospective analysis of clinical data from 104 patients with LAGC,who underwent radical resection after NICT between 2020 and 2023,was performed.Ddimer and fibrinogen concentrations were measured one week before NICT,and again one week before surgery,to analyze the association between these two indicators and their combined indices[non-hypercoagulation(D-dimer and fibrinogen concentrations within the upper limit of normal)vs hypercoagulation(D-dimer or fibrinogen concentrations above the upper limit of normal)]with prognosis.After radical resection,patients were followed-up periodically.The median follow-up duration was 21 months.RESULTS Data collected after NICT revealed that the three-year overall survival(OS)and disease-free survival(DFS)rates the non-hypercoagulation group were significantly better than those in the hypercoagulation group[94.4%vs 78.0%(P=0.019)and 87.0%vs 68.0%(P=0.027),respectively].Multivariate analysis indicated that hypercoagulation after NICT was an independent factor for poor postoperative OS[hazard ratio(HR)4.436,P=0.023]and DFS(HR 2.551,P=0.039).Pre-NICT data demonstrated no statistically significant difference in three-year OS between the non-hypercoagulation and hypercoagulation groups(88.3%vs 84.1%,respectively;P=0.443).CONCLUSION Hypercoagulation after NICT is an effective prognostic indicator in patients with LAGC undergoing radical gastrectomy.
文摘BACKGROUND Currently,there is a notable lack of reliable studies evaluating the impact of multidisciplinary treatment strategies following transarterial chemoembolization(TACE)on patients with hepatocellular carcinoma(HCC),underscoring the urgent need for higher-level research in this area.AIM To investigate the association of multidisciplinary treatment strategies with the immunological,coagulation,and tumor biomarker responses after post-TACE in HCC.METHODS This retrospective analysis included 100 patients with HCC who were categorized based on the treatment approach into the control(patients treated with TACE alone)and experimental groups(patients receiving multidisciplinary treatment strategies post-TACE).Participant characteristics,short-term efficacy,and safety assessment as well as immunological,coagulation,and tumor biomarker res-ponses between the two groups were collected and compared.RESULTS Compared with the control group,the experimental group demonstrated a superior overall response rate,along with an increased fibrinogen,markedly improved immunological biomarker,lower prothrombin time,thrombin time,alpha-fetoprotein,carcinoembryonic antigen,and carbohydrate antigen 199 levels,as well as a decreased abnormal prothrombin incidence,and a lower overall rate of adverse reactions.Notably,no significant difference in the activated partial thromboplastin time and D-dimer levels was observed between the two groups.CONCLUSION Multidisciplinary treatment strategies post-TACE have improved the treatment outcome,the immunological response,and the coagulation function,lowered the tumor biomarker response levels,and reduced the risk of adverse reactions in patients with HCC.
文摘BACKGROUND Colon polyps represent a significant clinical challenge in elderly patients.While endoscopic mucosal resection(EMR)and argon plasma coagulation(APC)are widely used,their comparative effectiveness in elderly populations remains unclear,particularly regarding postoperative recovery and complication profiles.AIM To compare the postoperative recovery,complications and efficacy of EMR and APC in elderly patients with colonic polyps.METHODS We retrospectively analyzed clinical data from 224 elderly patients with colon polyps treated at our center between January 2021 and July 2024.All patients were divided into the EMR group and APC group according to the surgical method they received.By comparing the operation time,intraoperative bleeding situation,hospital stays,postoperative inflammatory response index,complication rate and recurrence status of the two groups,the effect of the two surgical methods was comprehensively evaluated.RESULTS The APC group exhibited superior outcomes in terms of operative time(10.63 minutes vs 13.27 minutes,P<0.001),intraoperative bleeding situation(39.00%vs 52.42%,P=0.031),and length of hospital stay(1.63 days vs 3.87 days,P<0.001)compared to the EMR group.The one-time resection rate of the APC group(94.69%)was higher than that of the EMR group(89.14%)(P=0.026).The overall effective rates of the two groups were 94.35%and 92.00%,respectively.Postoperative procalcitonin and C-reactive protein levels were lower in the APC group than in the EMR group(P<0.001).The incidence of complications was comparable between the two groups(P=0.159).The recurrence rate was lower in the APC group(2.00%)than in the EMR group(8.06%)(P=0.045).CONCLUSION For elderly patients with colon polyps,APC showed certain advantages compared with EMR in promoting postoperative recovery,reducing the inflammatory response and the risk of complications.However,the study is limited by its single-center retrospective design and short follow-up period,and further multicenter prospective studies are needed to validate the findings.
基金supported by the National Natural Science Foundation of China(No.82302607)the Guangdong Basic and Applied Basic Research Foundation(Nos.2022A1515110555 and 2023A1515010932)+3 种基金the State Key Laboratory of Respiratory Disease(No.SKLRD-Z-202410)the Precision Medicine Joint Foundation of Basic and Applied Basic Research Foundation of Guangdong Province(No.2021B1515230008)the Independent Project of Guangdong-Hong Kong-Macao Joint Laboratory for Respiratory Infectious Diseases(No.GHMJLRID-Z-202102)the Guangdong Zhong Nanshan Medical Foundation(No.ZNSXS-20220015).
文摘The accurate and timely detection of biochemical coagulation indicators is pivotal in pulmonary and critical care medicine.Despite their reliability,traditional laboratories often lag in terms of rapid diagnosis.Point-of-care testing(POCT)has emerged as a promising alternative,which is awaiting rigorous validation.We assessed 226 samples from patients at the First Affiliated Hospital of Guangzhou Medical University using a Beckman Coulter AU5821 and a PUSHKANG POCT Biochemistry Analyzer MS100.Furthermore,350 samples were evaluated with a Stago coagulation analyzer STAR MAX and a PUSHKANG POCT Coagulation Analyzer MC100.Metrics included thirteen biochemical indexes,such as albumin,and five coagulation indices,such as prothrombin time.Comparisons were drawn against the PUSHKANG POCT analyzer.Bland-Altman plots(MS100:0.8206-0.9995;MC100:0.8318-0.9911)evinced significant consistency between methodologies.Spearman correlation pinpointed a potent linear association between conventional devices and the PUSHKANG POCT analyzer,further underscored by a robust correlation coefficient(MS100:0.713-0.949;MC100:0.593-0.950).The PUSHKANG POCT was validated as a dependable tool for serum and whole blood biochemical and coagulation diagnostics.This emphasizes its prospective clinical efficacy,offering clinicians a swift diagnostic tool and heralding a new era of enhanced patient care outcomes.
基金National Natural Science Foundation(51208122)Department of Science and Technology of Guangdong Province(2010B030900008)New Special Science and Technology Project of Pearl River and College Students’Innovative Entrepreneurial Training Plan Project in Guangdong Province~~
文摘[Objective] The aim was to treat acidic wastewater containing thallium by enhanced coagulation oxidation process. [Method] Enhanced coagulation oxidation process was made use of to remove thallium in the acidic wastewater in the experiment under the condition of 0.05 kg/L of potassium permanganate, 30% hydrogen peroxide and 0.05 kg/L calcium hypochlorite as oxidant, together with 0.092 kg/L CaO as coagulation. [Result] The results showed that thallium removal efficiencies achieved 99.98%, 99.1% and 99.95% when dosages of KMnO4, H2O2and Ca（ClO）2were added at 20, 2.2 and 37 ml, respectively, under the condition of 30 ml 0.092kg/L CaO being dosed and 99.93%, 99.69% and 99.98% were achieved when different dosages of CaO were added at 25, 35 and 25 ml, under the condition of 20ml KMnO4, 2.2 ml H2O2and 37 ml Ca（ClO）2respectively. [Conclusion] The experiment demonstrates that good removal effects of removal thallium from the acidic wastewater would be achieved by enhanced coagulation oxidation process.
文摘Snake venoms,especially those from the two subfamilies,Crotalinae and Viperinae,contained a lot of serine proteases. They were responsible for the hemorrhage,shock,or disorder of blood coagulation after envenomation. They acted,by activating,inactivating,or other converting effects,on almost all the components of hemostatic and fibrinolytic systems. Their sequences were homologous to trypsin-kallikrein serine proteases. Variation of primary sequences out of active center results in the difference of substrate specificities and the further difference of biological and pharmacological activities. Because of their common and unique properties compared to their physiological corresponding factors,snake venom proteases are proved to be an excellent model for the study of protease substrate discriminating mechanism. Furthermore,they have found an important position both in basic research and application of hemostasis and thrombosis in clinic.
基金the Chinese postdoctoral fund Natural Science fund of Shandong province No 93E0157 and State Major Besearch project (PD-B6-7-2)
文摘Study on the coagulation of four species of red tide organisms (Nitzschia pungens, Skeletonema costatum, Prorocentrum minimum and Noctiluca scintillans) with montmorillonite, and the effect of montmorillonite pretreatment on the coagulation shows that the capability for montmorillonite to coagulate with them is in the order: N. pungens > S. costatum > P. minimum > N. scintillans. The coagulation is discussed from the aspects of the structure, shape, size, movement, habit, etc. of different species and the results are explained theoretically. The experimental results also indicate that the treatment of montmorillonite with acid can enhance its coagulating capability. This is due to the fact that A1(OH2)6+3, exchanged from the clay lattice by hydrogen ion H+, forms hydroxy-aluminum polymers on the surface of the montmorillonite. The hydroxy-aluminum polymers positively charge and increase the positive characteristic of the clay surface, and also serves as a bridge between adjacent surfaces of particles. These two functions enhance the montmorillonite's capability for coagulating with the organism cells.
文摘Objective: To evaluate the efficacy and safety of percutaneous microwave coagulation therapy (PMCT) for patients with primary and metastatic hepatic tumors.Methods: The enrolled 100 patients with 186 tumor nodules who underwent PMCT included 79 cases of primary or recurrent liver cancers and 21 cases of metastatic liver cancer. The tumors were divided into two groups according to the tumor size in diameter: group A, 0.5 cm?<3 cm; group B, ≥3 cm?<5 cm. Under local and/or epidural anesthesia, a single percutaneous microwave antenna (or two antennas array applicator) was inserted directly into the tumor in the liver for thermo-coagulation with the aid of ultrasound guidance.Results: Among the 186 lesions in 100 patients with primary and metastatic liver cancers, in group A, 123 (66%) were coagulated once. A Follow-up of 6–12 months demonstrated that 112 lesions (91%) showed no local recurrence by CT or MRI; In group B, of the 63 lesions (33.87%) coagulated twice, 31 (49%) showed no local recurrence by CT or MRI during a follow-up of 6 months. There were no serious clinical side effects or complications in all the PMCT patients.Conclusion: PMCT gives satisfactory curative effect on tumors with <3 cm in size. It is partly effective on lesions ≥3 cm?<5 cm in size. It is a minimally invasive and effective therapy, can be used safely in the field of percutaneous hepatis surgery, and carried out even in patients with poor liver function. Key words hepatocellular carcinoma - microwave - coagulation - therapy
文摘目的探讨缩宫素联合垂体后叶素对宫缩乏力性产后出血患者纤溶、凝血功能的影响。方法便利抽样法选取2019年1月至2023年8月宫缩乏力性产后出血患者52例,按照随机数字表发分组即对照组和观察组,每组均26例,对照组使用缩宫素治疗,研究组采用缩宫素联合垂体后叶素的治疗方案,统计两组产后出血量、凝血功能指标、临床疗效、不良反应。结果观察组产后2h出血量(238.24±36.25 mL vs 279.32±42.71mL,t=3.739,P=0.001)、产后24h出血量(569.23±28.15mL vs 621.22±41.33mL,t=5.301,P<0.001)均显著低于对照组,且止血时间更短(21.11±3.22min vs 29.23±3.61min,t=8.559,P<0.001)。治疗后,观察组凝血酶时间(TT)、凝血酶原时间(PT)、活化部分凝血活酶时间(APTT)、D-二聚体(D-D)及纤维蛋白原(Fib)的改善差值均显著高于对照组(均P<0.001)。观察组临床总有效率为96.15%(25/26),显著高于对照组的76.92%(20/26)(χ^(2)=4.127,P=0.042)。两组不良反应总发生率比较,差异无统计学意义(23.08%vs15.38%,χ^(2)=0.495,P=0.482)。结论对于宫缩乏力性产后出血患者,在缩宫素基础上联合应用垂体后叶素,能更有效地减少产后出血量、缩短止血时间,并显著改善患者的纤溶与凝血功能,临床疗效确切,且未显著增加不良反应,安全性良好。
基金supported by the Major Program of National Natural Science Foundation of China (11132008)
文摘The Brownian coagulation of nanoparticles with initial bimodal size distribution, i.e., mode i and j, is numerically studied using the moment method. Evolutions of particle number concentration, geometric average diameter and geometric standard deviation are given in the free molecular regime, the continuum regime, the free molecular regime and transition regime, the free molecular regime and continuum regime, respectively. The results show that, both in the free molecular regime and the continuum regime, the num- ber concentration of mode i and j decreases with increasing time. The evolutions of particle geometric average diameter with different initial size distribution are quite different. Both intra-modal and inter-modal coagulation finally make the polydispersed size distribution become monodispersed. As time goes by, the size distribution with initial bimodal turns to be unimoda/and shifts to a larger particle size range. In the free molecular regime and transition regime, the inter- modal coagulation becomes dominant when the number concentrations of mode i and j are of the same order. The effects of the number concentration of mode i and mode j on the evolution of geometric average diameter of mode j are negligible, while the effects of the number concentration of mode j on the evolution of geometric average diameter of mode j is distinct. In the free molecular regime and continuum regime, the higher the initial number concentration of mode j, the more obvious the variation of the number concentration of mode i.
文摘Cyclovirobuxine D （CVB-D） is a compound extracted from Chinese traditional plant Buxus microphylla, which has been used for treating arrhythmia and myocardial ischemia in China. In this study, we investigated its effect on blood coagulation and thrombotic formation in mouse and rat models. The doses of CVB-D used in this study （5-20 mg/kg） prolonged clotting time （CT） in a dose-dependent manner （P〈0.01）. It also significantly prolonged thrombin time （TT）, prothrombin time （PT） and activated partial thromboplast time （aPTT） （P〈0.05 or P〈0.01） at the doses of 10-20 mg/kg. CVB-D did not affect the bleeding time （BT） compared with the control group, while warfarin significantly prolonged the bleeding time. CVB-D at the doses of 5-20 mg/kg reduced wet weight of thrombosis （P〈0.01）. This study demonstrated the anti-coagulation effect and anti-thrombosis effect of orally administered CVB-D without substantially increasing bleeding. These findings suggest that CVB-D probably can be used as an oral anti-coagulant in addition to its current applications.
基金The National Natural Science Foundation of China(No.61504027)the Natural Science Foundation of Jiangsu Province(No.BK20140647)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘A composite control scheme consisting of modepredictive control （MPC） and disturbance observer （DOB） iproposed to solve the control performance degradationproblem of the turbidity of the treated water in the presence osignificant changes in raw water quality, water flow rate andinternal model mismatch disturbances. The MPC is employedas a feedback controller for the coagulation process with alarge time delay. The DOB is adopted to estimate the severedisturbances in the turbidity control, such as large changes inraw water quality and water flow rate. The estimated valuesare applied for feed-forward compensation to rejecdisturbances. Finally, the disturbance rejection performancesfor step disturbances and time-varying disturbances in thenominal case and model mismatch case are tested. Thesimulation results illustrate that, compared with the MPCmethod, the proposed method can significantly improve thedisturbance rejection performance in the turbidity control othe treated water, no matter if in the presence of externadisturbances or internal model mismatch disturbances.
