11 results on '"Xiu D"'
Search Results
2. Modeling uncertainty in flow-structure interactions
- Author
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Xiu, D., primary, Lucor, D., additional, and Karniadakis, G.E., additional
- Published
- 2001
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Catalog
3. Experimental study on the effects of pressure loss on uniformity, application rate and velocity on different working conditions using the dynamic fluidic sprinkler
- Author
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Xingye Zhu, Alexander Fordjour, Frank Agyen Dwomoh, Joseph Kwame Lewballah, Samuel Anim Ofosu, Junping Liu, Xiu Dai, and James Oteng
- Subjects
Space ,Pressure ,Nozzle ,Uniformity ,Droplet ,Velocity ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
An experiment was conducted to determine the effects of pressure loss, combined spacing, and.coefficients of uniformity on the dynamic fluidic sprinkler. Spline interpolation was used to convert the radial water volume into grid-type data and various pressure conditions were used to simulate the three-dimensional water distribution under square and triangular combinations of sprinklers. For each of the combinations of the sprinklers, experiments were performed at operating pressures of 0.15, 0.2, 0.25, and 0.3 MPa, respectively. To find the optimum spatial distribution of sprinklers, three different sprinkler intervals, 1R, 1.2R, and 1.4R, were performed for the square and triangular combinations. The droplet size distributions were also measured along a radial transect from the sprinkler for each operational pressure using the Thies Clima Laser Precipitation Monitor. The results demonstrated that the average values of the inclination angles of the water droplet trajectory curves were 60.78° and 68.85° as the pressure rose from 0.15 MPa to 0.3 MPa. When the pressure exceeds 0.2 MPa, the square combination's distribution uniformity coefficients of 25% low and high values were higher than those of the triangle combination. Triangular combination coefficients of uniformity (CU) values initially decreased and then increased as sprinkler spacing increased, with the CU value under 1.4R spacing reaching 73.85%. At a 1.2R interval, the CU value of a triangular combination was 8.49% lower than that of a square combination, which is a significant difference. Peak irrigation values for the square combination, when the pressure was changed from 0.1 to 0.3 MPa, were 29.97, 22.9, 19.8, 19.91, and 19.21 mm h−1, respectively. The CU values at 0.2, 0.25, and 0.3 MPa decreased at rates of 0.07%, 1.36%, and 0.8%, respectively, when the pressure was reduced by 10%. more...
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- 2024
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4. Conversion to open surgery in obese patients undergoing minimally invasive distal pancreatectomy: results from a multicenter analysis.
- Author
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Ausania F, Gonzalez-Abós C, Landi F, Martinie JB, Vrochides D, Walsh M, Hossain SM, White S, Prabakaran V, Melstrom LG, Fong Y, Butturini G, Bignotto L, Valle V, Bing Y, Xiu D, Di Franco G, Sanchez-Bueno F, de'Angelis N, Laurent A, Giuliani G, Pernazza G, Esposito A, Salvia R, Bazzocchi F, Esposito L, Pietrabissa A, Pugliese L, Memeo R, Uyama I, Uchida Y, Ríos J, Coratti A, Morelli L, and Giulianotti PC more...
- Subjects
- Humans, Female, Male, Middle Aged, Aged, Treatment Outcome, Risk Factors, Multivariate Analysis, Time Factors, Retrospective Studies, Postoperative Complications etiology, Odds Ratio, Logistic Models, Chi-Square Distribution, Adult, Laparoscopy adverse effects, Blood Loss, Surgical, Operative Time, Europe, Pancreatectomy methods, Pancreatectomy adverse effects, Obesity complications, Obesity surgery, Robotic Surgical Procedures adverse effects, Conversion to Open Surgery
- Abstract
Background: Although minimally invasive distal pancreatectomy (MIDP) is considered a standard approach it still presents a non-negligible rate of conversion to open that is mainly related to some difficulty factors, as obesity. The aim of this study is to analyze the preoperative factors associated with conversion in obese patients with MIDP., Methods: In this multicenter study, all obese patients who underwent MIDP at 18 international expert centers were included. The preoperative factors associated with conversion to open surgery were analyzed., Results: Out of 436 patients, 91 (20.9%) underwent conversion to open, presenting higher blood loss, longer operative time and similar rate of major complications. Twenty (22%) patients received emergent conversion. At univariate analysis, the type of approach, radiological invasion of adjacent organs, preoperative enlarged lymphnodes and ASA ≥ III were significantly associated with conversion to open. At multivariate analysis, robotic approach showed a significantly lower conversion rate (14.6 % vs 27.3%, OR = 2.380, p = 0.001). ASA ≥ III (OR = 2.391, p = 0.002) and preoperative enlarged lymphnodes (OR = 3.836, p = 0.003) were also independently associated with conversion., Conclusion: Conversion rate is significantly lower in patients undergoing robotic approach. Radiological enlarged lymphnodes and ASA ≥ III are also associated with conversion to open. Conversion is associated with poorer perioperative outcomes, especially in case of intraoperative hemorrhage., (Copyright © 2024. Published by Elsevier Ltd.) more...
- Published
- 2024
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5. Effects of natural sound exposure on health recovery: A systematic review and meta-analysis.
- Author
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Zhu R, Yuan L, Pan Y, Wang Y, Xiu D, and Liu W
- Subjects
- Humans, Public Health, Anxiety, Emotions, Sound
- Abstract
Listening to natural sounds, both live and recorded, in either a natural or built environment is considered natural sound exposure (NSE). Sound is closely related to daily life, and research on the restorative effects of natural sounds is expanding. However, there is a lack of quantitative and comprehensive analysis on the impact of NSE on health recovery. This study systematically reviewed and conducted a meta-analysis on the impact of NSE on health recovery. Fifteen studies (1285 participants) were selected for the meta-analysis out of the 1157 literatures about the recovery of the NSE, searched from the Web of Science and Science Direct. The results indicate that NSE has certain positive effects: (a) In terms of emotional changes, NSE significantly reduces anxiety as measured by both the Visual Analog Scale (VAS) -2.31 (95 % CI -2.83, -1.79) and the State Anxiety Inventory (SAI) -12.22 (95 % CI -22.46, -1.98). (b) In terms of physiological reaction, NSE resulted in reduced heart rate (HR) -5.46 (95 % CI -9.62, -1.31), systolic blood pressure (SBP) -11.74 (95 % CI -15.51, -7.97), diastolic blood pressure (DBP) -13.98 (95 % CI -24.96, -2.99) and respiratory rate (RR) -1.58 (95 % CI -3.06, -0.10). (c) While the potential for restoration of cognitive performance by NSE was found, no consistent conclusions have been reached yet. However, there was significant heterogeneity between studies, primarily attributed to variations in study populations and methodologies. Because of the limited literature, we did not conduct subgroup analysis and meta-regression analysis. It is recommended that future studies address this heterogeneity by including more and higher-quality literature and employing rigorous methodologies to establish a robust foundation for evidence-based medicine. This will be of great significance for the application natural sounds in landscape planning and medical rehabilitation environments, and has the potential to promote improvements in public health., Competing Interests: Declaration of competing interest The authors declare no conflict of interest., (Copyright © 2024 Elsevier B.V. All rights reserved.) more...
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- 2024
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6. Incidence trend of splenic non-hematological malignancy: A population study based on the SEER database.
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Ge J, Xu Z, Xiu D, and Li D
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- Databases, Factual, Humans, Incidence, Spleen, Neoplasms
- Published
- 2022
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7. Chinese expert recommendations on management of hepatocellular carcinoma during COVID-19 pandemic: a nationwide multicenter survey.
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Zhao H, Zhou A, Zhou J, Bi X, Yan S, Jin J, Wei W, Li M, Gong C, Chen Q, Luo Z, Li N, Mao R, Chen X, Chen B, Zheng R, Zhao J, Han Y, Li Z, Che X, Tang Y, Sun Y, Huang Z, Zhang Y, Wang X, Zhang Y, Lu Z, Dang X, Song T, Liu C, Yue P, Yan D, Yue A, Zhang R, Luo S, Tan J, Zhang X, Bai X, Zhang X, He M, Xie Y, Wang W, Yang P, Yang Y, Zhang Y, Li Q, Peng T, Wang Z, Chen Y, Shang C, Liang Y, Zhang B, Zhang F, Wang L, Li D, Liu B, Zhu X, Hu Q, Chen M, Xiu D, Xia F, Zhang Y, Zeng Y, Mao Y, Li X, Ba Y, Liang T, Shen F, Liu L, Cai X, Zhou J, and Cai J more...
- Subjects
- Humans, Pandemics, SARS-CoV-2, Surveys and Questionnaires, COVID-19, Carcinoma, Hepatocellular diagnosis, Carcinoma, Hepatocellular epidemiology, Carcinoma, Hepatocellular therapy, Chemoembolization, Therapeutic, Liver Neoplasms diagnosis, Liver Neoplasms epidemiology, Liver Neoplasms therapy
- Abstract
Background: This study aimed to investigate the work status of clinicians in China and their management strategy alteration for patients with hepatocellular carcinoma (HCC) during the COVID-19 pandemic., Methods: A nationwide online questionnaire survey was conducted in 42 class-A tertiary hospitals across China. Experienced clinicians of HCC-related specialties responded with their work status and management suggestions for HCC patients during the pandemic., Results: 716 doctors responded effectively with a response rate of 60.1%, and 664 were included in the final analysis. Overall, 51.4% (341/664) of clinicians reported more than a 60% reduction of the regular workload and surgeons declared the highest proportion of workload reduction. 92.5% (614/664) of the respondents have been using online medical consultation to substitute for the "face-to-face" visits. Adaptive adjustment for the treatment strategy for HCC was made, including the recommendations of noninvasive and minimally invasive treatments such as transcatheter arterial chemoembolization for early and intermediate stage. Targeted therapy has been the mainstay for advanced stage and also as a bridge therapy for resectable HCC., Discussion: During the COVID-19 pandemic, online medical consultation is recommended to avoid social contact. Targeted therapy as a bridge therapy is recommended for resectable HCC considering the possibility of delayed surgery., (Copyright © 2021. Published by Elsevier Ltd.) more...
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- 2022
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8. Visual Hg(II) sensing in aqueous solution via a new 2,5-Bis(4-pyridyl)thiazolo[5,4-d]thiazole-based fluorescence coordination polymer.
- Author
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Li X, Xiu D, Shi J, Miao J, Yu Y, Song H, Lin J, Feng Q, and Yu H
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- Spectrometry, Fluorescence, Thiazoles, Water, Mercury, Polymers
- Abstract
A new fluorescence coordination polymer [Zn(Py
2 TTz)(5-OH-IPA)]n (1) (Py2 TTz = 2,5-bis(4-pyridyl)thiazolo[5,4-d]thiazole, 5-OH-IPA = 5-hydroxyisophthalic acid dianion) was synthesized, which exhibited the characteristics of fluorescence quenching and bathochromic shift toward Hg(II) in aqueous solution at pH 7.00. Mechanism study showed that the interactions between Hg(II) ions and Py2 TTz ligands in 1 were responsible for the fluorescence emission change. Thanks to the specific interactions between 1 and Hg(II), excellent selectivity was achieved both in aqueous solution and in solid test paper. The detection limit of 1 for Hg(II) sensing was 125.76 nmol L-1 and a linear rang was 1.00-10.00 μmol L-1 . More importantly, satisfactory recovery and accuracy of 1 for Hg(II) sensing were also obtained in buffer-free real water samples., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.) more...- Published
- 2022
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9. Tumour radiological appearance evaluated by enhanced CT correlates with tumour progression and survival in curable gallbladder cancer.
- Author
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Zhang L, Hou C, Chen M, Guo L, Xu Z, Wang L, Ling X, Wang G, Cui L, and Xiu D
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- Adult, Aged, Aged, 80 and over, Bile Ducts, Extrahepatic surgery, Disease Progression, Female, Gallbladder Neoplasms pathology, Gallbladder Neoplasms surgery, Hepatectomy, Humans, Kaplan-Meier Estimate, Lymph Node Excision, Lymph Nodes pathology, Male, Margins of Excision, Middle Aged, Neoplasm Staging, Survival Rate, Tomography, X-Ray Computed, Young Adult, Cholecystectomy, Gallbladder Neoplasms diagnostic imaging
- Abstract
Background: Surgical resection has been proposed for curable gallbladder cancer (GBCA); however, optimal preoperative evaluation and resection planning methods remain unestablished. The aim of this study was to establish the types of CT tumour radiological appearances in GBCA with a focus on its association with clinicopathologic features and its prognostic impact in curable GBCA., Methods: In all, 118 patients surgically treated for GBCA were identified and CT tumour radiological appearances were reviewed. Models were established and internally validated. Clinicopathologic variables and prognostic impact were analysed for correlation with tumour radiological appearance., Results: The classification and distribution of tumour radiological appearance in these patients was Type 1 (n = 14), Type 2 (n = 60), Type 3 (n = 21), Type 4 (n = 18), and undetermined (n = 5). Among the 113 patients, a higher tendency of T stage and incidence of lymph node metastasis was observed from Type 1 to Type 4. Most Type 1 patients were T1 stage, they have no lymph node involvement or recurrence. With a median follow-up of 25 months (range, 1-135 months), a clear prognostic difference was observed among the 4 types after surgical treatment (p < 0.001). Type 1 patients showed 100% 5-year survival rate. Among the 66 T2 tumours, both tumour location and tumour radiological appearance effectively stratified patient prognosis (p < 0.001, p = 0.007). Introducing tumour radiological appearance into tumour location enabled further prognostic stratification of the 35 T2h tumours (p < 0.001)., Conclusions: Type of CT tumour radiological appearance is a predictor of tumour biology. It may improve preoperative evaluation and resection planning., Competing Interests: Declaration of competing interest The authors have no conflicts of interest to disclose., (Copyright © 2020. Published by Elsevier Ltd.) more...
- Published
- 2020
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10. Stochastic Markovian modeling of electrophysiology of ion channels: reconstruction of standard deviations in macroscopic currents.
- Author
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Geneser SE, Kirby RM, Xiu D, and Sachse FB
- Subjects
- Electric Conductivity, Heart physiology, Humans, Ion Channel Gating physiology, Mathematics, Models, Biological, Patch-Clamp Techniques, Potassium Channels physiology, Electrophysiology, Ion Channels physiology, Markov Chains
- Abstract
Markovian models of ion channels have proven useful in the reconstruction of experimental data and prediction of cellular electrophysiology. We present the stochastic Galerkin method as an alternative to Monte Carlo and other stochastic methods for assessing the impact of uncertain rate coefficients on the predictions of Markovian ion channel models. We extend and study two different ion channel models: a simple model with only a single open and a closed state and a detailed model of the cardiac rapidly activating delayed rectifier potassium current. We demonstrate the efficacy of stochastic Galerkin methods for computing solutions to systems with random model parameters. Our studies illustrate the characteristic changes in distributions of state transitions and electrical currents through ion channels due to random rate coefficients. Furthermore, the studies indicate the applicability of the stochastic Galerkin technique for uncertainty and sensitivity analysis of bio-mathematical models. more...
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- 2007
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11. Short-course methotrexate and long-term acceptance of fully allogeneic rat cardiac grafts: a possible mechanism of tolerance.
- Author
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Sakuma Y, Xiu D, Uchida H, Hakamata Y, Takahashi M, Murakami T, Nagai H, and Kobayashi E
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- Animals, Antibodies, Anti-Idiotypic blood, Graft Survival, Rats, Rats, Inbred Strains, Skin Transplantation immunology, Transplantation, Homologous, Heart Transplantation immunology, Immune Tolerance immunology, Methotrexate therapeutic use
- Abstract
Although a short course of methotrexate (MTX) has a potential immunoregulatory effect on clinical allograft rejection, little data are available about the drug, and the mechanism of hyporeactivity after withdrawal is still unknown. In previous studies, we achieved permanent graft acceptance through administration of a short course of high-dose MTX during heterotopic ratheart transplantation (HHT) in a combination of DA (MHC haplotype; RT1(a)) to PVG/c (RT1(c)) rats. A 3-week course of MTX (0.25 mg/kg/day) was administered intraperitoneally to the PVG/c recipients of a DA heart graft, and 11 of 16 rats survived longer than 300 days after HHT. The splenic lymphocytes obtained from one recipient showed high reactivity against donor type splenic lymphocytes, but others did not. All serum samples from recipients showed immunosuppressive activity. The serum had anti-donor antibodies. These results showed that tolerance induced by short-course MTX was maintained by a serologic factor believed to be anti-idiotypic antibodies. more...
- Published
- 2002
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