LIVIVO - Search results -

Search results

Result 1 - 10 of total 40

Search options

Article ; Online: Analysis and multiple index evaluation of SPO distribution of bone traction needles for pelvic fracture reduction.

Yimin, Wei / Jingtao, Lei / Lei, Hu / Lihai, Zhang

2023 Volume 119, Page(s) 104031

Abstract: For robot-assisted pelvic fracture reduction, at least two bone needles need to be inserted into the ilium of the affected pelvis, and the robot clamping device is connected with the bone needles. The biomechanical properties of the pelvic ... ...

Abstract	For robot-assisted pelvic fracture reduction, at least two bone needles need to be inserted into the ilium of the affected pelvis, and the robot clamping device is connected with the bone needles. The biomechanical properties of the pelvic musculoskeletal tissues are different with the different Spatial Position and Orientation (SPO) of the bone needles. In order to determine the optimal SPO of bone needle pairs, the constraints between the bone needles and the pelvis are analyzed, and the SPO vectors of 150 groups bone needles are obtained by the KNN-hierarchical clustering method; a batch modeling method of bone needles with different SPO is proposed. 150 finite element models of damaged pelvic musculoskeletal tissue with different SPO of bone needles are established and simulated. The stress and strain distribution homogenization of musculoskeletal tissue with bone needles as evaluation index, the simulation results of 150 models are evaluated. Results show that, the anterior superior iliac spine and the anterior inferior iliac spine are suitable regions to place bone needles in the pelvis, and the optimal distribution of the needle combination is found in this region. The overall stress and strain distribution of the damaged pelvic musculoskeletal tissue under the large reduction force is the best.
MeSH term(s)	Humans ; Traction ; Needles ; Pelvis ; Fractures, Bone ; Fracture Fixation
Language	English
Publishing date	2023-07-23
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1181080-4
ISSN	1873-4030 ; 1350-4533
ISSN (online)	1873-4030
ISSN	1350-4533
DOI	10.1016/j.medengphy.2023.104031
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Cologne/Königswinter

Zs.B 2231: Show issues

Location:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
ab Jg. 2022: Lesesaal (EG)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Early Risk Warning of Highway Soft Rock Slope Group Using Fuzzy-Based Machine Learning

Cuiying Zhou / Jinwu Ouyang / Zhen Liu / Lihai Zhang

Sustainability, Vol 14, Iss 3367, p

2022 Volume 3367

Abstract: Maintaining the stability of highway soft rock slopes is of critical importance for ensuring the safety of road networks. Although much research has been carried out to assess the stability of individual soft rock slope, the goal of efficient and ... ...

Abstract	Maintaining the stability of highway soft rock slopes is of critical importance for ensuring the safety of road networks. Although much research has been carried out to assess the stability of individual soft rock slope, the goal of efficient and effective risk management focusing on multiple highway soft rock slopes has not been fully achieved due to the many complex factors involved and the interactions among these factors. In the present study, a machine learning algorithm based on a fuzzy neural network (FNN) and a comprehensive evaluation method based on the FNN is developed, in order to identify and issue early warnings regarding the risks induced by soft rock slopes along highways, in an efficient and effective way. Using a large amount of collected soft rock slope information as training and validation data, an FNN-based risk identification model is first developed to identify the risk level of individual soft rock slope based on the meteorological conditions, topographical and geomorphological factors, geotechnical properties, and the measured horizontal displacement. An FNN-based comprehensive evaluation method is then developed, in order to quantify the risk level of a soft rock slope group according to the slope, road and external factors. The results show that the risk level identification accuracy obtained based on validation of the FNN model was higher than 90%, and the model showed a good training effect. On this basis, we further made early warnings of the risks of soft rock slope groups. The proposed early-warning model can quickly and accurately evaluate the risk posed by multiple soft rock slopes to a highway, thereby ensuring the safety of the highway.
Keywords	highway soft rock slopes ; slope instability ; machine learning ; FNN ; risk identification ; early risk warning ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	670
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Percolation Threshold of Red-Bed Soft Rock during Damage and Destruction

Lei Yu / Haoqiang Lai / Cuiying Zhou / Zhen Liu / Lihai Zhang

Applied Sciences, Vol 12, Iss 15, p

2022 Volume 7615

Abstract: The critical damage point of the red-bed soft rock percolation phenomenon can be described as the percolation threshold. At present, there are insufficient theoretical and experimental studies on the percolation phenomenon and threshold of red-bed soft ... ...

Abstract	The critical damage point of the red-bed soft rock percolation phenomenon can be described as the percolation threshold. At present, there are insufficient theoretical and experimental studies on the percolation phenomenon and threshold of red-bed soft rock. In combination with theoretical analysis, compression experiment and numerical simulation, the percolation threshold and destruction of red-bed soft rock are studied in this paper. The theoretical percolation threshold of red-bed soft rock was obtained by constructing a renormalization group model of soft rock. Based on damage mechanics theory, rock damage characterization and strain equivalent hypothesis, a constitutive model of red-bed soft rock percolation damage was obtained. The percolation threshold of red-bed soft rock was determined by compression test and a damage constitutive model, which verified the rationality of the theoretical percolation threshold, and we numerically simulated the percolation of red-bed soft rock under triaxial compression. The results showed that the percolation threshold increases as the confining pressure rises, but decreases significantly with the action of water. In this study, the critical failure conditions and percolation characteristics of red-bed soft rock under different conditions were obtained. The relationship between percolation and soft rock failure was revealed, providing a new direction for studying the unstable failure of red-bed soft rock.
Keywords	red-bed soft rock ; percolation ; renormalization group ; constitutive model of damage ; threshold value ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	612
Language	English
Publishing date	2022-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.

Zhen Liu / Weihua Ming / Jieming Li / Cuiying Zhou / Lihai Zhang

PLoS ONE, Vol 16, Iss 6, p e

2021 Volume 0252733

Abstract: Shield tunneling in karst areas poses significant challenges, as vibration caused by the shield machine can disturb the stability of the karst caves, ultimately resulting in the collapse of a tunnel. In the present study, a numerical model involving an ... ...

Abstract	Shield tunneling in karst areas poses significant challenges, as vibration caused by the shield machine can disturb the stability of the karst caves, ultimately resulting in the collapse of a tunnel. In the present study, a numerical model involving an iteration process was developed based on the Mindlin solution scheme to identify the optimal shield tunneling speed for minimizing the disturbance to karst cave stability. The developed model was then implemented to investigate an underground tunnel constructed in a karst region with different shield tunneling strategies. By using the variation in the energy density of a karst cave as a performance index, the model predicts that when approaching the affected zone of a karst carve (e.g., approximately 5 m from the carve), the shield tunneling machine should be controlled within a certain speed (i.e., < 30 mm/min). Once the shield tunneling machine moves into the affected zone of the cave, the speed of the machine needs to be decelerated to 11 mm/min, and the speed of 30 mm/min can be restored when the shield machine moves out of the affected zone. This finding demonstrates that the developed model could potentially be used to identify the optimal shield tunneling speed to minimize the disturbance to karst cave stability and ensure the safety of tunnel construction in karst regions.
Keywords	Medicine ; R ; Science ; Q
Subject code	621
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Calculation model and bearing capacity optimization method for the soil settlement between piles in geosynthetic-reinforced pile-supported embankments based on the membrane effect.

Zhen Liu / Aobo Zhang / Jiangping Xu / Cuiying Zhou / Lihai Zhang

PLoS ONE, Vol 16, Iss 8, p e

2021 Volume 0256190

Abstract: The geosynthetic-reinforced pile-supported embankment (GRPSE) system has been widely used in road construction on soft soil. However, the application of the GRPSE system is often restricted by its high-cost. The reason is that they are designed for ... ...

Abstract	The geosynthetic-reinforced pile-supported embankment (GRPSE) system has been widely used in road construction on soft soil. However, the application of the GRPSE system is often restricted by its high-cost. The reason is that they are designed for bearing control as defined in the past. During the construction process, the pile spacing is reduced to meet the requirements for the embankment bearing capacity and settlement. These factors cause the membrane effect to not be exploited. As a result, the utilization efficiency of the bearing capacity of the soil between the piles is low and the project cost is high. Therefore, in order to solve the problem of insufficient bearing capacity of soil between piles, we established a settlement calculation model of soil between piles based on membrane effect. The model considers the relationship between the geosynthetic reinforcement (GR) and the pile spacing. Based on the obtained model, a method for optimizing the soil bearing capacity of GRPSEs is proposed. By controlling the settlement of soil between piles, the bearing capacity of soil between piles and the membrane effect of embankment can be fully utilized. Therefore, the project cost can be reduced. Finally, the method is applied to field tests for comparison. The results show that the method is reasonable and applicable. This method can effectively exploit the membrane effect and improve the utilization efficiency of the bearing capacity of the soil between piles. An economical and reasonable arrangement scheme for the piles and GR was obtained. This scheme can not only ensure the safety of the project, but also fully utilize the bearing capacity of the soil between the piles and provide a new method for engineering design.
Keywords	Medicine ; R ; Science ; Q
Subject code	690
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Robot-assisted Teleultrasound-guided Hemostasis and Hematoma Catheterization and Drainage for Osteoporosis Pelvic Fracture with Giant Hematoma and Active Bleeding

Keyan Li / MD / Ye Peng / Yingying Chen / Zhaoming Zhong / Yulong Ma / Tao Yao / Lihai Zhang / Faqin Lv

Advanced Ultrasound in Diagnosis and Therapy, Vol 7, Iss 4, Pp 416-

2023 Volume 419

Abstract: This paper reports a case of closed reduction internal fixation of pelvic fracture and minimally invasive hemostasis procedure and hematoma catheterization and drainage for the active pelvic bleeding site and giant hematoma, guided by a robot-assisted ... ...

Abstract	This paper reports a case of closed reduction internal fixation of pelvic fracture and minimally invasive hemostasis procedure and hematoma catheterization and drainage for the active pelvic bleeding site and giant hematoma, guided by a robot-assisted teleultrasound. In this case, the robot-assisted teleultrasound-guided minimally invasive interventional hemostasis and catheterization utilized a partial master-slave approach. It was preliminarily confirmed that robot-assisted teleultrasound-guided minimally invasive hemostasis and puncture catheterization for hematoma were accurate and effective. The robot-assisted teleultrasound overcomes the reliance on physician experience in ultrasound-guided interventional diagnostics and treatment, and promoting the use of minimally invasive "visualized" technology across any distance.
Keywords	\|robot-assisted\|teleultrasound\|5g\|interventional ultrasound ; Medical technology ; R855-855.5 ; Medicine ; R
Subject code	629
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	Editorial Office of Advanced Ultrasound in Diagnosis and Therapy
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Advanced surface engineering of titanium materials for biomedical applications

Pinliang Jiang / Yanmei Zhang / Ren Hu / Bin Shi / Lihai Zhang / Qiaoling Huang / Yun Yang / Peifu Tang / Changjian Lin

Bioactive Materials, Vol 27, Iss , Pp 15-

From static modification to dynamic responsive regulation

2023 Volume 57

Abstract: Titanium (Ti) and its alloys have been widely used as orthopedic implants, because of their favorable mechanical properties, corrosion resistance and biocompatibility. Despite their significant success in various clinical applications, the probability of ...

Abstract	Titanium (Ti) and its alloys have been widely used as orthopedic implants, because of their favorable mechanical properties, corrosion resistance and biocompatibility. Despite their significant success in various clinical applications, the probability of failure, degradation and revision is undesirably high, especially for the patients with low bone density, insufficient quantity of bone or osteoporosis, which renders the studies on surface modification of Ti still active to further improve clinical results. It is discerned that surface physicochemical properties directly influence and even control the dynamic interaction that subsequently determines the success or rejection of orthopedic implants. Therefore, it is crucial to endow bulk materials with specific surface properties of high bioactivity that can be performed by surface modification to realize the osseointegration. This article first reviews surface characteristics of Ti materials and various conventional surface modification techniques involving mechanical, physical and chemical treatments based on the formation mechanism of the modified coatings. Such conventional methods are able to improve bioactivity of Ti implants, but the surfaces with static state cannot respond to the dynamic biological cascades from the living cells and tissues. Hence, beyond traditional static design, dynamic responsive avenues are then emerging. The dynamic stimuli sources for surface functionalization can originate from environmental triggers or physiological triggers. In short, this review surveys recent developments in the surface engineering of Ti materials, with a specific emphasis on advances in static to dynamic functionality, which provides perspectives for improving bioactivity and biocompatibility of Ti implants.
Keywords	Titanium materials ; Orthopedic implants ; Bioactivity ; Static modification ; Dynamic responsive regulation ; Materials of engineering and construction. Mechanics of materials ; TA401-492 ; Biology (General) ; QH301-705.5
Subject code	670
Language	English
Publishing date	2023-09-01T00:00:00Z
Publisher	KeAi Communications Co., Ltd.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: External force estimation of fracture reduction robot based on force residual method

Jingtao Lei / Gongliang Zheng / Lei Hu / Lihai Zhang / Tianmiao Wang

International Journal of Advanced Robotic Systems, Vol

2020 Volume 17

Abstract: Robot-assisted fracture reduction surgery should be highly safe and accurate. It is necessary to accurately determine and control the reduction force of the reduction robot. In this article, a fracture reduction robot is designed with the configuration ... ...

Abstract	Robot-assisted fracture reduction surgery should be highly safe and accurate. It is necessary to accurately determine and control the reduction force of the reduction robot. In this article, a fracture reduction robot is designed with the configuration of the 6-universal-prismatic-universal (6-UPU). The vector method is used to analyze the kinematics of the reduction robot. The Jacobian matrix of the reduction robot and the second-order influence coefficient matrix of the acceleration are obtained. The Lagrangian method is adopted to analyze the dynamic of the reduction robot. The muscle contraction force of the femoral shaft fracture is analyzed based on the Hill model to determine the fracture reduction force. According to changing of the reduction force during the fracture reduction operation, a kind of external force estimation method based on force residual analysis is proposed. When there is no external force sensor at the end of the reduction robot, this method can be used to detect the reduction force in real time. According to the displacement, velocity, and output torque of each branch chain, the reduction force during the reduction operation of the reduction robot can be estimated. A simulation system is conducted and the simulation results show that the fracture reduction force can be estimated and accurately tracked in real time, which is of great significance for the safe operation of the fracture reduction robot.
Keywords	Electronics ; TK7800-8360 ; Electronic computers. Computer science ; QA75.5-76.95
Subject code	629
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	SAGE Publishing
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides

Cuiying Zhou / Guangjun Cui / Hao Yin / Lei Yu / Gankai Xu / Zhen Liu / Lihai Zhang

PLoS ONE, Vol 16, Iss 1, p e

Microscopic and macroscopic perspectives.

2021 Volume 0246214

Abstract: The main cause of rainfall-induced red-bed shallow landslides is the tendency of red-bed weathered soil to expand when it meets water. However, studies on the expansion mechanism of expansive soil have not considered the effects of hydration and particle ...

Abstract	The main cause of rainfall-induced red-bed shallow landslides is the tendency of red-bed weathered soil to expand when it meets water. However, studies on the expansion mechanism of expansive soil have not considered the effects of hydration and particle orientation. In this study, the hydration force of soil was determined according to the electric double-layer theory, the particle direction of soil was determined by analyzing images of soil obtained by scanning electron microscopy, and, finally, a microscopic model of the electrical double layer of red-bed weathered expansive soil was established in which the hydration force and soil-particle orientation were taken into account. The results showed that the expansion of red-bed weathered expansive soil is the result of hydration forces and repulsive forces in the electric double layer. The grain orientation of the soil strongly influenced the microscopic model. The unloading expansion rate of red-bed weathered expansive soil decreased with an increase in cation concentration and a decrease in pH value. It increased with an increase in the hydration cation radius. These experiments indicate the reliability of the microscopic model and provide a theoretical basis for the prevention and control of rainfall-induced red-bed shallow landslides.
Keywords	Medicine ; R ; Science ; Q
Subject code	630
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Reliability analysis of road networks in disaster waste management

Cheng, Cheng / Lihai Zhang / Russell George Thompson

Waste management. 2019 Feb. 01, v. 84

2019

Abstract: The condition of road networks which connect disaster affected areas and final disposal sites has a critical role in the management of disaster waste. In this paper, we present a two-stage framework to estimate the overall reliability and failure modes ... ...

Abstract	The condition of road networks which connect disaster affected areas and final disposal sites has a critical role in the management of disaster waste. In this paper, we present a two-stage framework to estimate the overall reliability and failure modes of a disaster waste management system considering the reliability of each route involved in the road network. In the first stage, first order reliability method and Ditlevsen bounds are applied to estimate system reliability. In the second stage, an event tree approach is implemented to analyse the failure modes of the system. The methodology is demonstrated with an artificial case study considering three different scales of disasters. The results obtained from the case study can provide information to decision makers regarding the priority of the routes in the system and the most likely failure mode.
Keywords	case studies ; decision making ; disasters ; roads ; waste management ; wastes
Language	English
Dates of publication	2019-0201
Size	p. 383-393.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2001471-5
ISSN	1879-2456 ; 0956-053X
ISSN (online)	1879-2456
ISSN	0956-053X
DOI	10.1016/j.wasman.2018.11.027
Database	NAL-Catalogue (AGRICOLA)

Order via subito

To top

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

Order via subito