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Search Results: 1 - 10 of 154804 matches for " Chih-Wei Wang "
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Study of Photocatalytic Degradation of Methyl Orange on Different Morphologies of ZnO Catalysts  [PDF]
Chih-Wei Tang
Modern Research in Catalysis (MRC) , 2013, DOI: 10.4236/mrc.2013.22003

In this study, several ZnO catalysts were prepared using different zinc sources as precursors. The different catalyst mor- phologies obtained were used to degrade photocatalytically a methyl orange (MO) dye solution, which was used to model wastewater pollution. The precursors, Zn(CH3COO)2, ZnCl2 and Zn(NO3)2, were individually added to a solution containing cetyltrimethylammonium bromide (CTAB) and sodium hydroxide (NaOH) for the hydrothermal synthesis of ZnO. After the hydrothermal reaction, the samples of ZnO were filtered, washed, dried at 110?C and calcined at 550?C, resulting in the formation of the rod-like (designated ZnO(I)), the rice-like (designated ZnO(II)) and the granular-like (designated ZnO(III)) catalysts. The catalysts were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM) and their UV-visible diffuse reflectance spectra (UV-Vis DRS). The results indicate that the photocatalytic degradation of the MO solution, after 60 min of UV irradiation, can reach percentages of 40%, 96% and 99% using the catalysts ZnO(I), ZnO(II) and ZnO(III), respectively. The morphology of the ZnO catalyst had an ap-

Steam Reforming of Ethanol over CoMg/SBA-15 Catalysts  [PDF]
Josh Y. Z. Chiou, Shih-Yi Yang, Chin-Liang Lai, Hsuan-Ying Kung, Chih-Wei Tang, Chen-Bin Wang
Modern Research in Catalysis (MRC) , 2013, DOI: 10.4236/mrc.2013.22A003

Hydrogen production through steam reforming of ethanol (SRE) over Mg modified Co-based catalysts supported on mesoporous SBA-15 was studied herein to evaluate the catalytic activity and the behavior of coke deposition. The CoyMgx/SBA-15 catalysts are obtained according to the steps of consecutive impregnation of Mg (x = 5 and 10 wt%) to be incorporated on SBA-15 and then follow the loading of Co (y = 10 and 20 wt%) using the incipient wetness impregnation method. The catalysts are characterized by using X-ray diffraction (XRD), temperature programmed reduction (TPR), transmission electron microscopy (TEM) and BET techniques. Also, the spent catalysts are further characterized by using XRD and TEM. The catalytic activity of the SRE is evaluated in a fixed-bed reactor under 22,000 h-1 GHSV and with an H2O/EtOH molar ratio of 13. All the CoyMgx/SBA-15 catalysts present a mesoporous structure, even after the SRE reaction. The optimum catalyst of Co20Mg5/SBA-15-H650 comes from the high loading of Co and high reduction temperature pretreatment, which show a high catalytic activity and stability at 550°C with a hydrogen yield (YH2) up to 5.78 and CO selectivity around 3.10%.

Erlotinib-associated Near-fatal Interstitial Pneumonitis in A Patient with Relapsed Lung Adenocarcinoma
Chun-Liang Chou,How-Wen Ko,Chih-Wei Wang,Chih-Teng Yu
Chang Gung Medical Journal , 2010,
Abstract: Erlotinib (Tarceva ) is a human epidermal growth factor receptor (EGFR) tyrosinekinase inhibitor used for treatment of locally advanced or metastatic non-small cell lung cancer(NSCLC) after failure of at least one prior chemotherapy regimen. Interstitial lung disease,associated with gefitinib (Iressa ) use, has been reported in approximately 1% ofpatients worldwide. However, the adverse pulmonary effects of erlotinib remain poorly documented.Reviewed English language publications in MEDLINE and PubMed suggest thatthis report is to be the first case report in English of a histologically-confirmed case of nearfatalinterstitial pneumonitis with acute lung injury, associated with erlotinib, in East Asianpatients. Physicians are hereby encouraged to promptly evaluate new or worsening pulmonarysymptoms so that they can detect early radiographic signs of pulmonary toxicity inpatients on erlotinib. If toxicity is confirmed, erlotinib should be discontinued and thepatient treated appropriately. The case presented suggests that the outcome of erlotinib-associatedpulmonary toxicity with acute respiratory failure may be favorable with adequateearly management.
Cost Feasibility of A Pre-checking Medical Tourism System for U.S. Patients Undertaking Joint Replacement Surgery in Taiwan
Ching-Ying Haung,Sheng-Pen Wang,Chih-Wei Chiang
Chang Gung Medical Journal , 2010,
Abstract: Background: Medical tourism is a relatively recent global economic and political phenomenonthat has assumed increasing importance for developing countries, particularlyin Asia. In fact, Taiwan possesses a niche for developing medicaltourism because many hospitals provide state-of-the-art medicine in all disciplinesand many doctors are trained in the United States (US). Among themost common medical procedures outsourced, joint replacements such astotal knee replacement (TKR) and total hip replacement (THR) are two surgeriesoffered to US patients at a lower cost and shorter waiting time than inthe US.Methods: This paper proposed a pre-checking medical tourism system (PCMTS) andevaluated the cost feasibility of recruiting American clients traveling toTaiwan for joint replacement surgery. Cost analysis was used to estimate theprime costs for each stage in the proposed PCMTS. Sensitivity analysis wasimplemented to examine how different pricings for medical checking and asurgical operation (MC&SO) and recovery, can influence the surplus perpatient considering the PCMTS. Finally, the break-even method was adoptedto test the tradeoff between the sunk costs of investment in the PCMTS andthe annual surplus for participating hospitals.Results: A novel business plan was built showing that pre-checking stations in medicaltourism can provide post-operative care and recovery follow-up.Adjustable pricing for hospital administrators engaged in the PCMTS consistedof two main costs: US$3,700 for MC&SO and US$120 for the hospitalstay. Guidelines for pricing were provided to maximize the annual surplusfrom this plan with different number of patients participating in PCMTS. Themaximal profit margin from each American patient undertaking joint surgeryis about US$24,315.Conclusions: Using cost analysis, this article might be the first to evaluate the feasibility ofPCMTS for joint replacement surgeries. The research framework in this articleis applicable when hospital administrators evaluate the feasibility of outsourcedmedical procedures other than TKR and THR.
Chiral structure of the solutions of the Ginsparg-Wilson relation
Ting-Wai Chiu,Chih-Wei Wang,Sergei V. Zenkin
Physics , 1998, DOI: 10.1016/S0370-2693(98)00982-4
Abstract: We analyse the structure of solutions of the Ginsparg-Wilson relation for lattice Dirac operator in topologically trivial gauge sector. We show that the properties of such solutions relating to the perturbative stability of the pole of the fermion propagator as well as to the structure of the Yukawa models based on these solutions are solely determined by the non-local chirally invariant part of these Dirac operators. Depending on the structure of this part, the pole in the fermion propagator may or may not be stable under radiative corrections. We illustrate this by explicit examples.
Leptospirosis in Taiwan - An Underestimated Infectious Disease
Chih-Wei Yang
Chang Gung Medical Journal , 2007,
Abstract: Leptospirosis is a re-emerging infectious disease affectingboth animals and humans worldwide. This infection is associatedwith occupational contact with animals, recreational exposureand contact with leptospires as a consequence of flooding.Multiple organ involvement may be encountered in acutesevere leptospirosis and early renal involvement is commonlycharacterized by tubulo-interstitial nephritis and tubular dysfunction.Leptospirosis has been increasingly recognized as animportant infectious disease in Taiwan since 1997 andLeptospira santarosai serovar Shermani is the main serovarencountered. The most common presentations are fever, jaundiceand acute renal failure. This triad presentation in patientswith acute multiple organ dysfunction should alert physiciansto the possibility of leptospirosis. Penicillin treatment is effectiveand may dramatically save patients from multiple organfailure provided it is given early. The rapid IgM assay may aid screening of Leptospirosis,thus allowing effective treatment to be initiated early. Leptospirosis appears to be underestimatedin Taiwan and affects at least 10% of patients with multiple organ dysfunction.Therefore, a high level of clinical suspicion may help in identifying underestimated leptospirosisin Taiwan.
On the injectivity radius and tangent cones at infinity of gradient Ricci solitons
Chih-Wei Chen
Mathematics , 2010,
Abstract: A lower-bound estimate of injectivity radius for complete Riemannian manifolds is discussed in a pure geometric viewpoint and is applied to study tangent cones at in?nity of certain gradient Ricci solitons. We also study the asymptotic volume ratio of gradient Ricci solitons.
Volume estimates and the asymptotic behavior of expanding gradient Ricci solitons
Chih-Wei Chen
Mathematics , 2011,
Abstract: We study the asymptotic volume ratio of non-steady gradient Ricci solitons. Moreover, a local estimate of the volume ratio is obtained for expanding solitons which satisfy $\lim_{dist(O,x)\rightarrow\infty} |Sect|\cdot dist(O,x)^2=0$. Therefore, for such a soliton, we can show that it must have $\mathbb{R}^n$ as one of its tangent cone at infinity. (Here we assume that the soliton is simply connected at infinity, has only one end and $n\geq 3$.)
Biomechanical comparison of unilateral and bilateral pedicle screws fixation for transforaminal lumbar interbody fusion after decompressive surgery -- a finite element analysis
Shih-Hao Chen, Shang-Chih Lin, Wen-Chi Tsai, Chih-Wei Wang, Shih-Heng Chao
BMC Musculoskeletal Disorders , 2012, DOI: 10.1186/1471-2474-13-72
Abstract: A validated finite-element (FE) model of L1-S1 was established to implant three types of cages (TLIF with a single moon-shaped cage in the anterior or middle portion of vertebral bodies, and TLIF with a left diagonally placed ogival-shaped cage) from the left L4-5 level after unilateral decompressive surgery. Further, the effects of unilateral versus bilateral pedicle screw fixation (UPSF vs. BPSF) in each TLIF cage model was compared to analyze parameters, including stresses and ROM on the neighboring annulus, cage-vertebral interface and pedicle screws.All the TLIF cages positioned with BPSF showed similar ROM (<5%) at surgical and adjacent levels, except TLIF with an anterior cage in flexion (61% lower) and TLIF with a left diagonal cage in left lateral bending (33% lower) at surgical level. On the other hand, the TLIF cage models with left UPSF showed varying changes of ROM and annulus stress in extension, right lateral bending and right axial rotation at surgical level. In particular, the TLIF model with a diagonal cage, UPSF, and contralateral facet screw fixation stabilize segmental motion of the surgical level mostly in extension and contralaterally axial rotation. Prominent stress shielded to the contralateral annulus, cage-vertebral interface, and pedicle screw at surgical level. A supplementary facet screw fixation shared stresses around the neighboring tissues and revealed similar ROM and stress patterns to those models with BPSF.TLIF surgery is not favored for asymmetrical positioning of a diagonal cage and UPSF used in contralateral axial rotation or lateral bending. Supplementation of a contralateral facet screw is recommended for the TLIF construct.
Web-based computer adaptive assessment of individual perceptions of job satisfaction for hospital workplace employees
Tsair-Wei Chien, Wen-Pin Lai, Chih-Wei Lu, Weng-Chung Wang, Shih-Chung Chen, Hsien-Yi Wang, Shih-Bin Su
BMC Medical Research Methodology , 2011, DOI: 10.1186/1471-2288-11-47
Abstract: The JCQ-37 makes data collection via CAT on the internet easy, viable and fast. A Rasch rating scale model was applied to analyze data from 300 randomly selected hospital employees who participated in job-satisfaction surveys in 2008 and 2009 via non-adaptive and computer-adaptive testing, respectively.Of the 37 items on the questionnaire, 24 items fit the model fairly well. Person-separation reliability for the 2008 surveys was 0.88. Measures from both years and item-8 job satisfaction for groups were successfully evaluated through item-by-item analyses by using t-test. Workers aged 26 - 35 felt that job satisfaction was significantly worse in 2009 than in 2008.A Web-CAT developed in the present paper was shown to be more efficient than traditional computer-based or pen-and-paper assessments at collecting data regarding workers' perceptions of job content.Many previous studies have reported on the relationships between job satisfaction, psychological distress, psychosocial processes and stress-related biological factors [1-5]. Amati et al. [1] reported that job satisfaction is related to psychological stress affecting cellular immune function and that changes in work satisfaction over time could affect the immunological-inflammatory status of workers. Optimizing the ways in which healthcare providers use institutional services to maximize the likelihood of positive health outcomes is thus urgent and essential [6,7].Within survey or research settings, there are two routinely used forms of standardized health status assessments [8].(1) A lengthy and structured interview conducted by experts to systematically investigate the presence and nature of each symptom of every disorder (this is often considered the ''gold standard'' in psychiatric diagnosis by researchers [9,10], but it requires significant amounts of time and training to administer).(2) A rapid assessment instrument that attempts to briefly screen for the most common symptoms of psychiatric disorders by usin
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