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Wu Shih-Ching,Hsu Hsueh-Chuan,Liu Mei-Yi,Ho Wen-Fu 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.1
Hydroxyapatite (HA) has been vigorously studied for orthopedic and dental applications due to its excellent bioactivity, osteoconductivity, and osteoinductivity. This study aims to present a simple room-temperature aqueous precipitation method for obtaining carbonated HA nanoparticles of high purity from biowaste chicken eggshells. Biowaste chicken eggshells were used for preparing HA through aqueous precipitation method. Moreover, mulberry leaf extract was used as a template to regulate the morphology, size, and crystallinity of HA. All produced nanocrystalline HA powders exhibited rod-like particle agglomerates of a size below 100 nm. The HA particles synthesized with the mulberry leaf extract showed higher crystallinity and slightly decreased crystallite sizes compared to the samples prepared without adding the extract. Carbonate peaks observed for the specimens closely matched those of A- and B-type carbonates, which can contribute to the low crystallinity. Notably, the HA synthesized from the eggshell powders contains several important trace elements such as Mg and Sr, which are benefi cial to the overall biological performance as biomaterials. The morphology, size, structure, and composition of the obtained HA products are similar to those of natural bones, and consequently, the products show potential as a material for biomedical applications.
Hydroxyapatite prepared from eggshell and mulberry leaf extract by precipitation method
Wu, Shih-Ching,Hsu, Hsueh-Chuan,Hsu, Shih-Kuang,Liu, Mei-Yi,Ho, Wen-Fu Techno-Press 2019 Biomaterials and Biomechanics in Bioengineering Vol.4 No.1
Eggshell is a waste material after the usage of egg. In this work, biowaste chicken eggshells were used for preparing carbonated hydroxyapatite (HA) nanoparticles of high purity through aqueous precipitation method at room temperature. The eggshell-derived HA will be a cost-effective bioceramics for biomedical applications and an effective material-recycling technology. Additionally, mulberry leaf extract was used as a template to regulate the morphology, size and crystallinity of HA, and the effects of pH value were also examined. Characterization of the samples was performed by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Scanning electron microscopy (SEM) was used to determine the size, shape and morphology of HA. The results indicate that only one phase of HA were synthesized in the both absence and presence of mulberry leaf extract at pH of 7 and above, while DCPD or DCPA/DCPD phase was observed at pH 4 condition. The crystallite sizes of the HA samples obviously decreased when adding mulberry leaf extract as a template, while they decreased gradually as the solution pH levels increased. With increasing pH level from 7 to 14, the rod-like HA nanoparticles gradually changed to spherical shape at pH 14. Note that, the obtained product is Mg and Sr containing A- and B-type carbonate HA at alkaline pH and it can be a potential material for biomedical applications.
Human-Robot Interaction with Multi-Human Social Pattern Inference on a Multi-Modal Robot
Shih-Huan Tseng,Tung-Yen Wu,Ching-Ying Cheng,Li-Chen Fu 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
To enable service robots enter a multi-human office environment, it is important to find a group of human users’ social patterns and then to provide a proper service to them in time. Usually, human users’ social patterns are represented in terms of nonverbal social signals. In this paper, some nonverbal social signals are fast detected in social environments. Then, robot can find the spatial social patterns of human users. Those patterns are indicated to human-to-human, human-to-robot or multi-human-to-robot interaction. Experimental results shows that our robot successfully find the aforementioned users’ social patterns.
The effect of bending loads on the dynamic behaviors of a rolling guide
James Shih-Shyn Wu,Jyh-Cheng Chan,Gent-An Tsai,Ching-Yuan Lin,Feng-Ming Ou 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.3
Dynamic behaviors of ball-type contact surfaces under unbalanced bending loads are studied using point-to-point analysis, threedimensional finite element simulation based on the Hertz Contact Theory, and a modal test. Results derived from these models are very similar but the Finite Element Model provides the best results since it allows for more elements of study, such as the steel ball, carriage,rail etc. In the study, results also show that frequencies vary slightly, but there is an obvious change in shapes. Therefore, the contact stiffness in simulations must be properly selected with the conclusion that different external loadings may affect the dynamic characteristics of such structures significantly.
Liwei Wu,Jingyan Ban,Qian Jiang,Ting-Ting Li,Bing-Chiuan Shiu,Shih-Yu Huang,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
Polyethylene terephthalate (PET) nonwoven fabrics, carbon fabrics (CF), and flexible polyurethane (PU) foamsare made into novel sandwich composites using one-step molding. The flame retradance and mechanical properties of thesandwich composites are evaluated, examining the influences of the content of flame retardant agent (20, 30, 40, and 50 wt%)and areal density of PET panels (200, 300, and 400 g/m2). The test results show that the PET/CF/PU sandwich composites arerated flame retardant as V0 and do not generate melts. The failure mode of PET/CF/PU sandwich composites converts fromoverall fracture to layered fracture as a result of increasing the flame retardant agent. The tensile strength at break of PET/CF/PU sandwich composites with corresponding PET panels is 650 N for 200 g/m2, 928 N for 300 g/m2, and 1744 N for 400 g/m2,which are 42.63 %, 60.48 %, and 77.85 % greater than those of the PET/PU sandwich composites. Moreover, the burstingstrength of PET/CF/PU sandwich composites with corresponding PET panels is 3322 N for 200 g/m2, 3869 N for 300 g/m2,and 4978 N for 400 g/m2, which are 195 %, 180 %, and 143 % greater than those of the PET/PU sandwich composites.
Psoas Abscess Caused by Non-Typhoid Salmonella in a Patient with Severe Aplastic Anemia
Chin-Chi Kuo,Shih-Chi Ku,Jann-Tay Wang,Ching-Wei Tsai,Vin-Cent Wu,Wen-Chien Chou 연세대학교의과대학 2010 Yonsei medical journal Vol.51 No.3
The clinical spectrum of infections caused by non-typhoid Salmonella spp. includes gastroenteritis, enteric fever,bacteremia, and extraintestinal localized complications, especially in immunocompromised hosts. Here we report a patient with severe aplastic anemia developing left iliopsoas abscess caused by non-typhoid Salmonella (NTS),which was successfully treated by prolonged antibiotic treatment and repeated debridement. Our data indicate that aplastic anemia is a risk factor for infection caused by NTS.
Ka‑Kin Wong,Hsueh‑Chuan Hsu,Shih‑Ching Wu,Wen‑Fu Ho 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
In this study, novel nonequiatomic Ti-rich Ti-Zr-Nb-Mo medium-entropy alloys (Ti-MEAs) with a metastable body-centeredcubic structure were designed using Mo equivalent theory ([Mo]eq) for biomedical applications. The Ti65-Zr20-Nb14-Mo1(at%; Ti65-M1) and Ti65-Zr18-Nb16-Mo1 (at%; Ti65-M2) exhibited high yield strength of 1188 and 1118 MPa, respectively. Notably, the moduli of Ti65-M1 and Ti65-M2 were as low as 67.4 and 61 GPa, respectively, which were considerably lowerthan those of commercial biomedical alloys and several biomedical HEAs/MEAs. Transmission electron microscopy imagesindicated that Ti65-M2 reached a metastable state, resulting in a low elastic modulus. Furthermore, the yield-strength-to-elastic-modulus ratios (× 1000) of Ti65-M1 and Ti65-M2 were as high as 17.6 and 18.3, respectively, which were approximatelythree times greater than that of a commercial Ti-6Al-4V ELI implant. This study applied metastable theory for developingtwo metastable Ti-MEAs with low elastic moduli.
Ho, Wen-Fu,Tsou, Hsi-Kai,Wu, Shih-Ching,Hsu, Shih-Kuang,Chuang, Shao-Hsuan,Hsu, Hsueh-Chuan Techno-Press 2014 Biomaterials and biomedical engineering Vol.1 No.1
The purpose of this experiment was to evaluate the apatite-formation abilities of low-modulus Ti-7.5Mo substrates treated with NaOH aqueous solutions and subsequent ethyl alcohol aging before soaking them in simulated body fluid. Specimens of Ti-7.5Mo were initially treated with 5 M NaOH at $60^{\circ}C$ for 24 h, resulting in the formation of a porous network structure composed of sodium hydrogen titanate. Afterwards, the specimens were aged in ethyl alcohol at $60^{\circ}C$ for 5 or 10 min, and subsequently immersed in simulated body fluid at $37^{\circ}C$ for 3, 7 and 14 days. Ethyl alcohol aging significantly increased the apatite-forming abilities of Ti-7.5Mo. The amount of apatite deposited on the Ti-7.5Mo after NaOH treatment and subsequent ethyl alcohol aging was much greater, especially after the Ti-7.5Mo specimens were aged for 5 min. Due to its excellent combination of bioactivity, low elastic modulus and low processing costs, the Ti-7.5Mo treated with NaOH aqueous solutions and subsequently aged in ethyl alcohol has promising heavy load-bearing applications.
Ho, Wen-Fu,Tsou, Hsi-Kai,Wu, Shih-Ching,Hsu, Shih-Kuang,Chuang, Shao-Hsuan,Hsu, Hsueh-Chuan Techno-Press 2014 Biomaterials and Biomechanics in Bioengineering Vol.1 No.1
The purpose of this experiment was to evaluate the apatite-formation abilities of low-modulus Ti-7.5Mo substrates treated with NaOH aqueous solutions and subsequent ethyl alcohol aging before soaking them in simulated body fluid. Specimens of Ti-7.5Mo were initially treated with 5 M NaOH at $60^{\circ}C$ for 24 h, resulting in the formation of a porous network structure composed of sodium hydrogen titanate. Afterwards, the specimens were aged in ethyl alcohol at $60^{\circ}C$ for 5 or 10 min, and subsequently immersed in simulated body fluid at $37^{\circ}C$ for 3, 7 and 14 days. Ethyl alcohol aging significantly increased the apatite-forming abilities of Ti-7.5Mo. The amount of apatite deposited on the Ti-7.5Mo after NaOH treatment and subsequent ethyl alcohol aging was much greater, especially after the Ti-7.5Mo specimens were aged for 5 min. Due to its excellent combination of bioactivity, low elastic modulus and low processing costs, the Ti-7.5Mo treated with NaOH aqueous solutions and subsequently aged in ethyl alcohol has promising heavy load-bearing applications.