LIVIVO - Suchergebnisse -

Suchergebnis

Treffer 1 - 10 von insgesamt 23

Suchoptionen

Artikel ; Online: Potential approaches for intervening aging

Shen Jianghua / Liu Guang-Hui / Song Moshi

National Science Open, Vol

2022 Band 1

Schlagwörter	Science ; Q ; Engineering (General). Civil engineering (General) ; TA1-2040
Sprache	Englisch
Erscheinungsdatum	2022-08-01T00:00:00Z
Verlag	Science Press
Dokumenttyp	Artikel ; Online
Datenquelle	BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

Volltext online

Volltext online

Zusatzmaterialien

Fernleihe an ZB MED

Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

Artikel ; Online: Risk factors for acute kidney injury after major abdominal surgery in the elderly aged 75 years and above.

Shen, Jianghua / Chu, Yanqi / Wang, Chaodong / Yan, Suying

BMC nephrology

2022 Band 23, Heft 1, Seite(n) 224

Abstract: Objectives: The study aimed to investigate the incidence and risk factors of acute kidney injury (AKI) in elderly patients (aged ≥ 75 years) undergoing major nonvascular abdominal surgery.: Methods: The study was a retrospective study that evaluated ... ...

Abstract	Objectives: The study aimed to investigate the incidence and risk factors of acute kidney injury (AKI) in elderly patients (aged ≥ 75 years) undergoing major nonvascular abdominal surgery. Methods: The study was a retrospective study that evaluated the incidence of AKI in patients within 48 h after major abdominal surgeries. Patients' preoperative characteristics and intraoperative management, including the use of nephrotoxic medications, were evaluated for associations with AKI using a logistic regression model. Results: A total of 573 patients were included in our analysis. A total of 33 patients (5.76%) developed AKI, and 30 (90.91%), 2 (6.06%) and 1 (3.03%) reached the AKI stages 1, 2 and 3, respectively. Older age (adjusted OR, aOR 1.112, 95% confidence interval, CI 1.020-1.212), serum albumin (aOR 0.900, 95% CI 0.829-0.977), baseline eGFR (aOR 3.401, 95% CI 1.479-7.820), the intraoperative occurrence of hypotension (aOR 3.509, 95% CI 1.553-7.929), and the use of hydroxyethyl starch in combination with nonsteroidal anti-inflammatory drugs (aOR 3.596, 95% CI 1.559-8.292) or furosemide (aOR 5.724, 95% CI 1.476-22.199) were independent risk factors for postoperative AKI. Conclusions: Several risk factors, including intraoperative combined administration of HES and furosemide, are independent factors for AKI during abdominal surgeries. Anesthesiologists and surgeons should take precautions in treating at-risk patients.
Mesh-Begriff(e)	Acute Kidney Injury/epidemiology ; Acute Kidney Injury/etiology ; Aged ; Furosemide ; Humans ; Hydroxyethyl Starch Derivatives/adverse effects ; Postoperative Complications/chemically induced ; Postoperative Complications/epidemiology ; Retrospective Studies ; Risk Factors
Chemische Substanzen	Hydroxyethyl Starch Derivatives ; Furosemide (7LXU5N7ZO5)
Sprache	Englisch
Erscheinungsdatum	2022-06-23
Erscheinungsland	England
Dokumenttyp	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2041348-8
ISSN	1471-2369 ; 1471-2369
ISSN (online)	1471-2369
ISSN	1471-2369
DOI	10.1186/s12882-022-02822-7
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

Zusatzmaterialien

Über subito bestellen

Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

Details ▾
- Kostenpflichtig bestellen

Artikel ; Online: Unraveling the dispersion mechanism of carbon nanotubes in aluminum powder particles during high energy ball milling by FIB-TEM study

Cao, Lin / Zhen, Biao / Wan, Jie / Shen, Jianghua / Li, Shufeng / Liu, Shuiqing / Li, Jinshan

Powder Technology. 2023, p.118339-

2023 , Seite(n) 118339–

Abstract: For the development of high-performance aluminum (Al) matrix composites reinforced with carbon nanotubes (CNTs), high energy ball milling (HEBM) is the most prevalent method to disperse CNTs in Al powder. However, the dispersion mechanism of CNTs in Al ... ...

Abstract	For the development of high-performance aluminum (Al) matrix composites reinforced with carbon nanotubes (CNTs), high energy ball milling (HEBM) is the most prevalent method to disperse CNTs in Al powder. However, the dispersion mechanism of CNTs in Al powder is still unclear, mainly because it is difficult to characterize CNTs when they are buried inside Al powder particles. Herein, focused-ion-beam-assisted transmission electron microscopy observation of CNTs in Al powder via HEBM with various milling times was conducted. Results showed that with increasing HEBM time, CNTs clusters were firstly broken up to be dispersed shorter-lengthed CNTs on the surface of Al flakes with gradually reduced thickness. Afterward, cold-welding of Al flakes was the predominant phenomenon, which resulted in re-spheroidization of Al powders and homogeneously dispersed CNTs. This study may provide guidance for controlling and optimizing the HEBM process to disperse CNTs in Al matrix towards the development of high-performance CNTs/Al composites.
Schlagwörter	aluminum ; carbon nanotubes ; energy ; transmission electron microscopy ; Aluminum matrix composites (AMCs) ; Carbon nanotubes (CNTs) ; High energy ball milling (HEBM) ; Cold welding process ; Dispersion mechanism
Sprache	Englisch
Erscheinungsort	Elsevier B.V.
Dokumenttyp	Artikel ; Online
Anmerkung	Pre-press version
ISSN	0032-5910
DOI	10.1016/j.powtec.2023.118339
Datenquelle	NAL Katalog (AGRICOLA)

Volltext online

Zugriff für angemeldete ZB MED Nutzerinnen und Nutzer

Zusatzmaterialien

Über subito bestellen

Fernleihe an ZB MED

Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

Details ▾
- Volltext online
- Kostenpflichtig bestellen

Dissertation / Habilitation ; Online: Mechanical behavior and deformation mechanism in light metals at different strain rates

Shen, Jianghua

2015

Abstract: Developing light metals that have desirable mechanical properties is always the object of the endeavor of materials scientists. Magnesium (Mg), one of the lightest metals, had been used widely in military and other applications. Yet, its relatively poor ... ...

Abstract	Developing light metals that have desirable mechanical properties is always the object of the endeavor of materials scientists. Magnesium (Mg), one of the lightest metals, had been used widely in military and other applications. Yet, its relatively poor formability, as well as its relatively low absolute strength, in comparison with other metals such as aluminum and steels, caused the use of Mg to be discontinued after World War II. Owing to the subsequent energy crisis of the seventies, recently, interest in Mg development has been rekindled in the materials community. The main focus of research has been quite straight-forward: increasing the strength and formability such that Mg and its alloys may replace aluminum alloys and steels to become yet another choice for structural materials. This dissertation work is mainly focused on fundamental issues related to Mg and its alloys. More specifically, it investigates the mechanical behavior of different Mg-based materials and the corresponding underlying deformation mechanisms. In this context, we examine the factors that affect the microstructure and mechanical properties of pure Mg, binary Mg-alloy (with addition of yttrium), more complex Mg-based alloys with and without the addition of lanthanum, and finally Mg-based metal matrix composites (MMCs) reinforced with ex-situ ceramic particles. More specifically, the effects of the following factors on the mechanical properties of Mg-based materials will be investigated: addition of rare earths (yttrium and lanthanum), in-situ/ex-situ formed particles, particle size or volume fraction and materials processing, effect of thermal-mechanical treatment (severe plastic deformation and warm extrusion), and so on and so forth. A few interesting results have been found from this dissertation work: (i) although rare earths may improve the room temperature ductility of well-annealed Mg, the addition of yttrium results in ultrafine and un-recrystallized grains in the Mg-Y alloy subjected to equal channel angular pressing (ECAP); (ii) the reverse volume fraction effect arises as the volume fraction of nano-sized ex-situ formed reinforcements is beyond 10%; (iii) nano-particles are more effective in strengthening Mg than micro-particles when the volume fraction is below 10%; (iv) complete dynamic recovery and/or recrystallization is required to accomplish the moderate ductility in Mg, together with a strong matrix-particle bonding if it is a Mg-based composite; and (v) localized shear failure is observed in all Mg samples, recrystallized completely, which is attributed to the reduced strain hardening rate as a result of the exhaustion of twinning and/or dislocation multiplication.
Schlagwörter	Mechanics\|Mechanical engineering\|Materials science
Thema/Rubrik (Code)	669
Sprache	ENG
Erscheinungsdatum	2015-01-01 00:00:01.0
Verlag	The University of North Carolina at Charlotte
Erscheinungsland	us
Dokumenttyp	Dissertation / Habilitation ; Online
Datenquelle	BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

Volltext online

Volltext online

Zusatzmaterialien

Fernleihe an ZB MED

Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

Artikel ; Online: Enhanced adiabatic shear band susceptibility in Ti composites reinforced with quasi-continuous network of graphene nanosheets

Shi, Wendi / Yan, Qi / Shen, Jianghua / Zhen, Biao / Li, Yulong

Composites Part A. 2022 Sept., v. 160 p.107055-

2022

Abstract: Graphene nanosheets (GNSs) can remarkably advance the mechanical properties of titanium metal matrix composites (TiMCs) by forming a quasi-continuous network architecture. However, the failure mechanism of the network architecture, especially under ... ...

Abstract	Graphene nanosheets (GNSs) can remarkably advance the mechanical properties of titanium metal matrix composites (TiMCs) by forming a quasi-continuous network architecture. However, the failure mechanism of the network architecture, especially under impact loading, has never been truly understood. In this work, a Ti–6Al–4V based composite reinforced with GNSs was adopted to study the failure behavior of the quasi-continuous network architecture of GNSs under impact loading, as well as its influence on macroscopic behavior of TiMCs. Experimental results revealed that, the quasi-continuous networked TiMCs exhibited a propensity of failure by adiabatic shearing, where the shear band seemed to propagate (and probably also initiate) along the network architecture. Microstructural observation suggested that, instead of grain size or texture, the enhanced ASB susceptibility of the composite is attributed to the high defect density induced by networked reinforcement. Then, a comprehensive discussion relates the enhanced ASB susceptibility quantitatively with adiabatic shear dissipation energy.
Schlagwörter	energy ; graphene ; nanosheets ; texture ; titanium ; Graphite ; Mechanical properties ; Microstructural analysis ; Impact behavior ; Shear bands
Sprache	Englisch
Erscheinungsverlauf	2022-09
Erscheinungsort	Elsevier Ltd
Dokumenttyp	Artikel ; Online
ZDB-ID	2012223-8
ISSN	1359-835X
ISSN	1359-835X
DOI	10.1016/j.compositesa.2022.107055
Datenquelle	NAL Katalog (AGRICOLA)

Volltext online

Zugriff für angemeldete ZB MED Nutzerinnen und Nutzer

Zusatzmaterialien

Über subito bestellen

Details ▾
- Volltext online
- Kostenpflichtig bestellen

Artikel ; Online: Hyperbranched polymer functionalized flexible perovskite solar cells with mechanical robustness and reduced lead leakage.

Li, Zhihao / Jia, Chunmei / Wan, Zhi / Xue, Jiayi / Cao, Junchao / Zhang, Meng / Li, Can / Shen, Jianghua / Zhang, Chao / Li, Zhen

Nature communications

2023 Band 14, Heft 1, Seite(n) 6451

Abstract: Perovskite solar cells (PSCs) are multilayer structures. The interface between electron transport layer and perovskite is the mechanical weakest point in flexible PSCs due to its low fracture energy. Herein, we develop a highly adhesive polyamide-amine- ... ...

Abstract	Perovskite solar cells (PSCs) are multilayer structures. The interface between electron transport layer and perovskite is the mechanical weakest point in flexible PSCs due to its low fracture energy. Herein, we develop a highly adhesive polyamide-amine-based hyperbranched polymers to reinforce the interface. The interface fracture energy is improved from 1.08 to 2.13 J·m
Sprache	Englisch
Erscheinungsdatum	2023-10-13
Erscheinungsland	England
Dokumenttyp	Journal Article
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-023-41931-1
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

Zusatzmaterialien

Über subito bestellen

Details ▾
- Kostenpflichtig bestellen

Artikel ; Online: Fabrication of a micro/nanocomposite structure on the surface of high oxygen concentration titanium to promote bone formation.

Luo, Huiwen / Diao, Xiaoou / Qian, Fei / Shi, Wendi / Li, Kai / Liu, Huan / Wu, Yulu / Shen, Jianghua / Xin, Haitao

Biomaterials advances

2023 Band 154, Seite(n) 213631

Abstract: This study investigated the properties of the micro/nano composite structure on the surface of high oxygen concentration titanium (HOC-Ti) after anodic oxidation modification (HOC-NT) and evaluated its biocompatibility as a dental implant material in ... ...

Abstract	This study investigated the properties of the micro/nano composite structure on the surface of high oxygen concentration titanium (HOC-Ti) after anodic oxidation modification (HOC-NT) and evaluated its biocompatibility as a dental implant material in vitro and in vivo. HOC-Ti was produced by titanium powders and rutile powders using the powder metallurgy method. Its surface was modified by anodic oxidation. After detecting the electrochemical characteristics, the surface properties of HOC-NT were investigated. MC3T3 and MLO-Y4 cells were employed to evaluate the biocompatibility of HOC-NT and cocultured to study the effects of the changes in osteocytes induced by HOC-NT on osteoblasts. While, its possible mechanism was investigated. In addition, osseointegration around the HOC-NT implant was investigated through in vivo experiments. The results showed that a unique micronano composite structure on the HOC-Ti surface with excellent hydrophilicity and suitable surface roughness was created after anodic oxidation promoted by its electrochemical characteristics. The YAP protein may play an important role in regulating bone remodeling by β-catenin and Rankl/OPG Signaling Pathways. An in vivo study also revealed an accelerated formation rate of new bone and more stable osseointegration around the HOC-NT implant. In view of all experimental results, it could be concluded that the unique morphology of HOC-NT has enhanced physicochemical and biological properties. The promotion of bone formation around implants indicated the feasibility of HOC-NT for applications in oral implants.
Mesh-Begriff(e)	Osteogenesis ; Titanium/pharmacology ; Osseointegration/physiology ; Nanocomposites ; Oxygen/pharmacology
Chemische Substanzen	Titanium (D1JT611TNE) ; Oxygen (S88TT14065)
Sprache	Englisch
Erscheinungsdatum	2023-09-21
Erscheinungsland	Netherlands
Dokumenttyp	Journal Article
ISSN	2772-9508
ISSN (online)	2772-9508
DOI	10.1016/j.bioadv.2023.213631
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

Volltext online

Zugriff für angemeldete ZB MED Nutzerinnen und Nutzer

Zusatzmaterialien

Über subito bestellen

Fernleihe an ZB MED

Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

Details ▾
- Volltext online
- Kostenpflichtig bestellen

Artikel ; Online: Simultaneously improving mechanical, thermal, and anti-wear properties of Ti alloys using 3D-networked graphene as reinforcement

Yan, Qi / Zhen, Biao / Ye, Wenting / Zhang, Tao / Wan, Jie / Zhou, Qing / Shen, Jianghua / Li, Jinshan / Huang Lü, Wenfeng / Wang, Hao

Carbon. 2023 Sept., v. 213 p.118152-

2023

Abstract: The simultaneous improvement of mechanical and functional properties of Ti alloys is of considerable significance for their diverse applications and service life. Incorporating graphene with Ti is hoping to realize that, however, it is challenging to ... ...

Abstract	The simultaneous improvement of mechanical and functional properties of Ti alloys is of considerable significance for their diverse applications and service life. Incorporating graphene with Ti is hoping to realize that, however, it is challenging to achieve the improvement because of the poor chemical stability of carbon/Ti systems. This challenge becomes particularly significant when using high carbon-content reinforcements, as the reinforcement agglomeration is considered to adversely affect composite performances. In this work, an efficient powder metallurgy method was developed to fabricate titanium matrix composites reinforced by a high content of graphene nanosheets (GNSs). Quasi-continuous GNSs were arranged in a 3D network and were surrounded by in-situ TiC. The results revealed that the load-transfer and solid-solution strengthening factors contributed to the high mechanical strength of the composites. Moreover, the GNS networks conduced to the improvement of thermal conduction, reduced the total weight, and enhanced the anti-wear performance of the composites via self-lubrication. Furthermore, the proposed approach can be applied to other carbon/metal composites for achieving significant improvements in their performance.
Schlagwörter	durability ; graphene ; heat transfer ; metallurgy ; nanosheets ; strength (mechanics) ; titanium ; Titanium matrix composites ; Strength ; Thermal conductivity ; Anti-wear
Sprache	Englisch
Erscheinungsverlauf	2023-09
Umfang	p. 118152
Erscheinungsort	Elsevier Ltd
Dokumenttyp	Artikel ; Online
Anmerkung	Pre-press version
ISSN	0008-6223
DOI	10.1016/j.carbon.2023.118152
Datenquelle	NAL Katalog (AGRICOLA)

Volltext online

Zugriff für angemeldete ZB MED Nutzerinnen und Nutzer

Zusatzmaterialien

Über subito bestellen

Fernleihe an ZB MED

Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

Details ▾
- Volltext online
- Kostenpflichtig bestellen

Artikel ; Online: Dynamic self-strengthening of a bio-nanostructured armor - conch shell.

Li, Haoze / Shen, Jianghua / Wei, Qiuming / Li, Xiaodong

Materials science & engineering. C, Materials for biological applications

2019 Band 103, Seite(n) 109820

Abstract: Bio-nanowire structured armors - conch shells, which are often collected as art pieces, possess a special function - an unusual resilience against high speed predatory attacks. Under high-strain-rate compression (strain rate ~ ... ...

Abstract	Bio-nanowire structured armors - conch shells, which are often collected as art pieces, possess a special function - an unusual resilience against high speed predatory attacks. Under high-strain-rate compression (strain rate ~10
Mesh-Begriff(e)	Animal Shells/chemistry ; Animal Shells/ultrastructure ; Animals ; Biomechanical Phenomena ; Microscopy, Electron, Scanning ; Microscopy, Electron, Transmission ; Nanostructures/ultrastructure ; Snails/anatomy & histology
Sprache	Englisch
Erscheinungsdatum	2019-06-01
Erscheinungsland	Netherlands
Dokumenttyp	Journal Article
ZDB-ID	2012160-X
ISSN	1873-0191 ; 0928-4931
ISSN (online)	1873-0191
ISSN	0928-4931
DOI	10.1016/j.msec.2019.109820
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

Volltext online

Zugriff für angemeldete ZB MED Nutzerinnen und Nutzer

Zusatzmaterialien

Über subito bestellen

Details ▾
- Volltext online
- Kostenpflichtig bestellen

Artikel ; Online: Association of preoperative medication with postoperative length of stay in elderly patients undergoing hip fracture surgery.

Shen, Jianghua / Yu, Yahui / Wang, Chaodong / Chu, Yanqi / Yan, Suying

Aging clinical and experimental research

2020 Band 33, Heft 3, Seite(n) 641–649

Abstract: Background: For elderly patients who are about to undergo surgery, research on the effects of preoperative medication on postoperative outcomes is rare, especially preoperative discontinuation-requiring medication (PDRM) which needed to be discontinued ... ...

Abstract	Background: For elderly patients who are about to undergo surgery, research on the effects of preoperative medication on postoperative outcomes is rare, especially preoperative discontinuation-requiring medication (PDRM) which needed to be discontinued because of its increased risk of postoperative complications. Aim: To investigate whether preoperative medication (PDRM and polypharmacy) is associated with postoperative length of hospital stay (LOS) in elderly patients undergoing hip fracture surgery. Methods: Patients aged ≥ 65 who were scheduled for hip (limited to femoral tuberosity) fracture surgery were included. Baseline characteristics, preoperative medication and postoperative LOS were collected from the electronic medical record. The primary outcome was postoperative LOS. Results: A total of 369 hip fracture patients were included. There were 188 and 122 patients exposed to PDRM and polypharmacy, respectively. Multivariate analysis models were constructed using significant factors for prolonged postoperative hospital stay from univariate analysis: Model I (body mass index (BMI), Charlson comorbidity index (CCI) ≥ 7, creatinine clearance rate (Ccr) < 60 and PDRM) and Model II (BMI, Ccr ≥ 7, Ccr < 60 and polypharmacy). CCI was the most significant factor. Its adjusted odds ratio was as large as 2.7 and attributable risk was 63%. In preoperative medication use, both polypharmacy and PDRM showed significant association with postoperative LOS. Conclusion: The present study supported the impact of PDRM on postoperative LOS in geriatric hip fracture patients. The results added a further aspect to preoperative medication optimization in elderly patients undergoing hip fracture surgery.
Mesh-Begriff(e)	Aged ; Hip Fractures/surgery ; Humans ; Length of Stay ; Odds Ratio ; Postoperative Complications/epidemiology ; Retrospective Studies ; Risk Factors
Sprache	Englisch
Erscheinungsdatum	2020-05-21
Erscheinungsland	Germany
Dokumenttyp	Journal Article
ZDB-ID	2104785-6
ISSN	1720-8319 ; 1594-0667
ISSN (online)	1720-8319
ISSN	1594-0667
DOI	10.1007/s40520-020-01567-3
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

Volltext online

Zugriff für angemeldete ZB MED Nutzerinnen und Nutzer

Zusatzmaterialien

Verfügbar in ZB MED Köln/Königswinter

Zs.A 3343: Hefte anzeigen

Standort:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (2.OG)
ab Jg. 2022: Lesesaal (EG)

Über subito bestellen

Details ▾

Zum Seitenanfang

Ihre letzten Suchen

Volltext online

Zusatzmaterialien

Kategorien

Fernleihe an ZB MED

Zusatzmaterialien

Kategorien

Über subito bestellen

Volltext online

Zusatzmaterialien

Kategorien

Über subito bestellen

Fernleihe an ZB MED

Volltext online

Zusatzmaterialien

Kategorien

Fernleihe an ZB MED

Volltext online

Zusatzmaterialien

Kategorien

Über subito bestellen

Zusatzmaterialien

Kategorien

Über subito bestellen

Volltext online

Zusatzmaterialien

Kategorien

Über subito bestellen

Fernleihe an ZB MED

Volltext online

Zusatzmaterialien

Kategorien

Über subito bestellen

Fernleihe an ZB MED

Volltext online

Zusatzmaterialien

Kategorien

Über subito bestellen

Volltext online

Zusatzmaterialien

Kategorien

Verfügbar in ZB MED Köln/Königswinter

Über subito bestellen