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Balancing method without trial weights for rotor systems based on similitude scale model

Ruiduo YE, Liping WANG, Xiaojie HOU, Zhong LUO, Qingkai HAN

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 4,   Pages 571-580 doi: 10.1007/s11465-018-0478-x

Abstract:

A balancing method without trial weights based on the dynamic similitude scale model was proposedrequired coefficients for the balancing problem of the prototype system through a similarity model test withoutThe balancing method without trial weights was proposed based on the similitude relationship of the influenceThe effect of the balancing method without trial weights was compared with that of the traditional influence

Keywords： rotor system     dynamic similitude     balancing     without trial weights     influence coefficient    

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Negative weights in network time model

Zoltán A. VATTAI, Levente MÁLYUSZ

Frontiers of Engineering Management 2022, Volume 9, Issue 2,   Pages 268-280 doi: 10.1007/s42524-020-0109-1

Abstract: Monsieur Roy and John Fondahl implicitly introduced negative weights into network techniques to representpaper aims to review the theoretical possibilities and technical interpretations (and use) of negative weightsWe focus on pure relative time models, without considering other restrictions (such as calendar data,

Keywords： graph technique     network technique     construction management     scheduling    

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Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

Frontiers in Energy 2012, Volume 6, Issue 1,   Pages 29-34 doi: 10.1007/s11708-012-0178-x

Abstract: microstructure with elongated grains in the hot-extrusion direction for the 18%Cr-ODS steels with and without

Keywords： oxide dispersion strengthened (ODS) steel     milling     extrusion     aluminum     yttria    

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Thermo-elastic extended meshfree method for fracture without crack tip enrichment

A. ASADPOUR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 441-447 doi: 10.1007/s11709-015-0319-5

Abstract: This is the first manuscript presenting an extended meshfree method for thermo- elastic fracture which does not exploit a crack tip enrichment. The crack is modeled by partition of unity enrichment of the displacement and temperature field. Only a step function is employed that facilitates the implementation. To ensure that crack tip is at the correct position, a Lagrange multiplier field ahead of the crack tip is introduced along a line. The Lagrange multiplier nodal parameters are discretised with the available meshfree functions. Two benchmark examples illustrate the efficiency of the method.

Keywords： meshfree method     thermo-elasticity    

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Trial design of arch bridge of composite box section with steel web-concrete flange

Jiangang WEI, Qingwei HUANG, Baochun CHEN,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 370-375 doi: 10.1007/s11709-010-0073-7

Abstract: Bridge (the longest concrete arch bridge in the world with a main span of 420 m) as a prototype, trialComparison of quantities and structural behaviors of the prototype concrete arch with the two trial designed

Keywords： steel webs     concrete     box arch     trial design     structural behaviors     finite element method    

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Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Luisa PANI, Flavio STOCHINO

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1196-1214 doi: 10.1007/s11709-020-0662-z

Abstract: In this study an experimental database of 113 RC slabs without shear reinforcement under punching loadsinternational standards, a new proposed model for punching shear strength and rotation of RC slabs without

Keywords： punching shear strength     reinforced concrete     slabs     reinforcement ratio    

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Performance of fixed beam without interacting bars

Aydin SHISHEGARAN, Behnam KARAMI, Timon RABCZUK, Arshia SHISHEGARAN, Mohammad Ali NAGHSH, Mohammreza MOHAMMAD KHANI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1180-1195 doi: 10.1007/s11709-020-0661-0

Abstract: Increasing the bending capacity of reinforced concrete (RC) elements is one of important topics in structure engineering. The goal of this study is to develop a transferred stress system (TSS) on longitudinal reinforcement bars for increasing the bending capacity of RC frames. The study is divided into two parts, i.e., experimental tests and nonlinear FE analysis. The experiments were carried out to determine the load-deflection curves and crack patterns of the ordinary and TSS fixed frame. The FE models were developed for simulating the fixed frames. The obtained load-deflection results and the observed cracks from the FE analysis and experimental tests are compared to evaluate the validation of the FE nonlinear models. Based on the validated FE models, the stress distribution on the ordinary and TSS bars were evaluated. We found the load carrying capacity and ductility of TSS fixed beam are 29.39% and 23.69% higher compared to those of the ordinary fixed beams. The crack expansion occurs on the ordinary fixed beam, although there are several crack openings at mid-span of the TSS fixed beam. The crack distribution was changed in the TSS fixed frame. The TSS fixed beam is proposed to employ in RC frame instead of ordinary RC beam for improving the performance of RC frame.

Keywords： transferred stress system     bending capacity     crack opening     crack propagation     FE nonlinear model     stress distribution    

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Development and clinical trial of a novel bioactive bone cement

LEONG John, LI Zhaoyang, LU William

Frontiers of Medicine 2008, Volume 2, Issue 2,   Pages 117-126 doi: 10.1007/s11684-008-0022-1

Abstract: Strontium (Sr) and related compounds have become more attractive in the prevention and treatment of osteoporosis. Previously, we developed a novel bioactive bone cement which is mainly composed of strontium-containing hydroxyapatite (Sr-HA) filler and bisphenol A diglycidylether dimethacrylate (Bis-GMA) resin. This bone cement is superior to conventional polymethylmethacrylate (PMMA) bone cement in bioactivity, biocompatibility, and osseointegration. It also has shown sufficient mechanical strength properties for its use in percutaneous vertebroplasty (PVP) and total hip replacement (THR). In this paper, we review the and clinical evidence for the effectiveness of this bioactive bone cement.

Keywords： bioactivity     effectiveness     strontium-containing hydroxyapatite     osseointegration     sufficient mechanical    

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Weights-Based Gravity Energy Storage Looks to Scale Up

Sean O´Neill

Engineering 2022, Volume 14, Issue 7,   Pages 3-6 doi: 10.1016/j.eng.2022.05.007

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Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 725-740 doi: 10.1007/s11709-018-0510-6

Abstract: On the basis of the test, the punching shear capacity formula of RAC slabs with and without steel fibres

Keywords： recycled aggregate concrete     steel fibres     slab     punching shear     recycled coarse aggregates replacement percentage    

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Expression and function of DMT1 without IRE in C6 cells mediated by recombinant adenovirus

Xixun DU*, Huamin XU*, Hong JIANG, Jun WANG, Lei WANG, Junxia XIE

Frontiers of Medicine 2009, Volume 3, Issue 1,   Pages 67-71 doi: 10.1007/s11684-009-0010-0

Abstract: In the present study, we constructed a recombinant adenovirus containing the gene of DMT1 without the

Keywords： divalent metal transporter 1     recombinant adenovirus     homologous recombination     iron    

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inhibitor is associated with the reduced risk of all-cause mortality in COVID-19 among patients with/without

Frontiers of Medicine 2022, Volume 16, Issue 1,   Pages 102-110 doi: 10.1007/s11684-021-0850-9

Abstract: Consecutively hospitalized patients with confirmed coronavirus disease 2019 (COVID-19) in Wuhan, China were retrospectively enrolled from January 2020 to March 2020 to investigate the association between the use of renin–angiotensin system inhibitor (RAS-I) and the outcome of this disease. Associations between the use of RAS-I (angiotensin-converting enzyme inhibitor (ACEI) or angiotensin receptor blocker (ARB)), ACEI, and ARB and in-hospital mortality were analyzed using multivariate Cox proportional hazards regression models in overall and subgroup of hypertension status. A total of 2771 patients with COVID-19 were included, with moderate and severe cases accounting for 45.0% and 36.5%, respectively. A total of 195 (7.0%) patients died. RAS-I (hazard ratio (HR)=0.499, 95% confidence interval (CI) 0.325–0.767) and ARB (HR=0.410, 95% CI 0.240–0.700) use was associated with a reduced risk of all-cause mortality among patients with COVID-19. For patients with hypertension, RAS-I and ARB applications were also associated with a reduced risk of mortality with HR of 0.352 (95% CI 0.162–0.764) and 0.279 (95% CI 0.115–0.677), respectively. RAS-I exhibited protective effects on the survival outcome of COVID-19. ARB use was associated with a reduced risk of all-cause mortality among patients with COVID-19.

Keywords： COVID-19     RAS inhibitor     hypertension     all-cause mortality    

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Small cell carcinoma of the urinary bladder without gross hematuria: a case report

Wanqiu Huang,Yang Luan,Lu Jin,Tao Wang,Ruibao Chen,Zheng Liu,Zhiqiang Chen,Ruzhu Lan

Frontiers of Medicine 2015, Volume 9, Issue 3,   Pages 384-387 doi: 10.1007/s11684-015-0405-z

Abstract:

Small cell carcinoma of the urinary bladder (SCCB) is a rare and aggressive form of bladder cancer with poor prognosis. Hematuria is the main symptom of this malignancy, and most patients have a history of smoking. The disease incidence of malignant bladder tumors in China is approximately 0.74%. Early and accurate diagnosis of SCCB can ensure timely and appropriate treatment of this malignant disease. Oncologic surgery is the standard treatment; however, it may not be a curative approach. Chemotherapy and/or radiotherapy should be performed following surgical removal. This case report describes a patient with a single neoplasm diagnosed as SCCB that arose because of recurrence of bladder cancer after bladder tumor resection. In contrast to previously reported cases, this patient had no gross hematuria and no history of smoking.

Keywords： carcinoma     small cell     urinary bladder neoplasms     diagnosis    

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Cobalt nitride enabled benzimidazoles production from furyl/aryl bio-alcohols and -nitroanilines without

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 68-81 doi: 10.1007/s11705-022-2174-y

Abstract: recyclable nitrogen-doped carbon catalysts (Co/CNx-T, T denotes the pyrolysis temperature) without

Keywords： biomass conversion     furanic compounds     benzimidazoles     hydrogen transfer     bifunctional catalysis    

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Influencing mechanism of high solid concentration on anaerobic mono-digestion of sewage sludge without

Yuyao ZHANG,Huan LI,Can LIU,Yingchao CHENG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 6,   Pages 1108-1116 doi: 10.1007/s11783-015-0806-x

Abstract: High-solids anaerobic digestion of sewage sludge was a promising process, but high solid concentration negatively influenced methane production. The influencing mechanism was systematically analyzed in this study through a series of static anaerobic digestion experiments at total solids (TS) contents of 3%–15%. The results showed that TS 6% was the boundary between low-solids and high-solids anaerobic digestion, and the accumulative methane yield decreased exponentially when TS increased from 6% to 15%. The performance of anaerobic digestion was directly determined by the efficiency of mass transfer, and the relation between methane yield and sludge diffusive coefficients was well described by a power function. Thus, the increasing TS resulted in an exponential increase in sludge viscosity but an exponential decrease in diffusive coefficient. The blocked mass transfer led to the accumulation of volatile fatty acids (VFAs) and free ammonia. Acetic metabolism was the main process, whereas butyric and propionic metabolisms occurred at the initial stage of high-solids anaerobic digestion. The concentration of VFAs reached the maximum at the initial stage, which were still lower than the threshold influencing methanogens. The concentration of free ammonia increased gradually, and the methanogenesis was inhibited when free ammonia nitrogen exceeded 50 mg·L . Consequently, the deterioration of high-solids anaerobic digestion was related to the blocked mass transfer and the resulting ammonia accumulation.

Keywords： anaerobic digestion     methane     sewage sludge     volatile fatty acids     free ammonia    

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Title Author Date Type Operation

Balancing method without trial weights for rotor systems based on similitude scale model

Ruiduo YE, Liping WANG, Xiaojie HOU, Zhong LUO, Qingkai HAN

Journal Article

Negative weights in network time model

Zoltán A. VATTAI, Levente MÁLYUSZ

Journal Article

Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

Journal Article

Thermo-elastic extended meshfree method for fracture without crack tip enrichment

A. ASADPOUR

Journal Article

Trial design of arch bridge of composite box section with steel web-concrete flange

Jiangang WEI, Qingwei HUANG, Baochun CHEN,

Journal Article

Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Luisa PANI, Flavio STOCHINO

Journal Article

Performance of fixed beam without interacting bars

Aydin SHISHEGARAN, Behnam KARAMI, Timon RABCZUK, Arshia SHISHEGARAN, Mohammad Ali NAGHSH, Mohammreza MOHAMMAD KHANI

Journal Article

Development and clinical trial of a novel bioactive bone cement

LEONG John, LI Zhaoyang, LU William

Journal Article

Weights-Based Gravity Energy Storage Looks to Scale Up

Sean O´Neill

Journal Article

Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Journal Article

Expression and function of DMT1 without IRE in C6 cells mediated by recombinant adenovirus

Xixun DU*, Huamin XU*, Hong JIANG, Jun WANG, Lei WANG, Junxia XIE

Journal Article

inhibitor is associated with the reduced risk of all-cause mortality in COVID-19 among patients with/without

Journal Article

Small cell carcinoma of the urinary bladder without gross hematuria: a case report

Wanqiu Huang,Yang Luan,Lu Jin,Tao Wang,Ruibao Chen,Zheng Liu,Zhiqiang Chen,Ruzhu Lan

Journal Article

Cobalt nitride enabled benzimidazoles production from furyl/aryl bio-alcohols and -nitroanilines without

Journal Article

Influencing mechanism of high solid concentration on anaerobic mono-digestion of sewage sludge without

Yuyao ZHANG,Huan LI,Can LIU,Yingchao CHENG

Journal Article