http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Xiaohang Liu,Weijun Peng,Liangping Zhou,He Wang 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.2
Objective: To investigate the biexponential apparent diffusion parameters of diverse prostate tissues and compare them with monoexponential apparent diffusion coefficient (ADC) value in the efficacy to discriminate prostate cancer from benign lesions. Materials and Methods: Eleven healthy volunteers and 61 patients underwent a conventional (b-factors 0, 1000 s/mm2) and a 10 b-factor (0 to 3000 s/mm2) diffusion-weighted imaging (DWI). The monoexponential ADC value and biexponential parameters of fast ADC (ADCf), fraction of ADCf (f), slow ADC (ADCs) value for 29 prostate cancer, 28 benign prostatic hyperplasia (BPH), 24 prostatitis lesions and normal tissue were calculated and compared. Receiver operating characteristic analysis was performed to determine the sensitivity, specificity and optimal cut-off points. Results: Prostate cancer had lower ADC, ADCf, f, and ADCs than all other tissues (p < 0.01). Prostatitis exhibited a lower ADC, ADCf, ADCs and f than the peripheral zone tissue (p < 0.01), and BPH showed a lower ADC and ADCf than the central gland tissue (p < 0.01). The ADCf demonstrated a comparable accuracy with ADC in differentiating cancer from BPH [area under the curve (AUC) 0.93 vs. 0.92] and prostatitis AUC 0.98 vs. 0.99) (both p > 0.05), but the AUC of f and ADCs in differentiating cancer from BPH (0.73 and 0.81) and prostatitis (0.88 and 0.91) were significantly lower than ADC (all p < 0.05). Conclusion: The biexponential DWI appears to provide additional parameters for tissue characterization in prostate, and ADCf helps to yield comparable accuracy with ADC in differentiating cancer from benign lesions.
Xiaohang Yu,Xiangzhao Mao,Shuai He,Pei Liu,Yanchao Wang,Changhu Xue 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.5
Biochemical characteristics of fast fermentedfish sauce made by adding anchovy juice during the processof low salt, solid state fermentation were investigated using3 different techniques (A: adding anchovy juice in theprocess of making koji, B: adding anchovy juice in theprocess of fermentation, and C: not adding anchovy juice). After fermentation under optimized conditions, the aminonitrogen contents of sauces A and B were 7.50 and 7.73mg/mL after two weeks, respectively. Chemical analysissuggested that the amounts of amino nitrogen and reducingsugar, degree of hydrolysis (DH), DPPH radical-scavengingactivity, total acidity, and total amino acid in sauce B werehigher than those in sauce A. Volatile odorant analysis andsensory evaluation showed that sauce B was superior tosauce A. Adding anchovy juice during the process offermentation is a good way to produce a fish sauce with agood flavor and nutrition value.
Influence of flow-induced oscillating disturbance on the surface heat transfer of impingement flow
Xiaohang Qu,Xiaoni Qi,Qianjian Guo,Yongqi Liu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
Flow-induced oscillation is an effective way to enhance heat transfer, which requires no extra energy consumption and can prevent fouling and soot formation. To test the flow-induced oscillation effect on the heat transfer of impingement flow, an 18 mm wide and 30 m thick membrane tape was mounted at the exit of the ejection pipe. As the ejection Reynolds number increased from 5280 to 9827, the oscillating frequency also increased. In addition, three different oscillating regimes were observed, these being quasi-still, 2D-oscillating and 3D-oscillating, with the transition Re depending on the tape length. The heating plate was 3D-printed and electrical heating wires were embedded within it so as to predetermine the local heat flux by numerical analysis, and be able to calculate the heat transfer coefficient (HTC). The results demonstrate that heat transfer enhancement is more prominent in the vertical direction to the tape than in the parallel direction. Moreover, the distinctive heat transfer enhancement effect near the plate center becomes weaker as it goes toward the outside of the plate, and even turns negative with an increasing r/D. Using a longer piece of tape or having smaller intervals between the tape tip and plate was also shown to improve the heat transfer effect. The spontaneous oscillating disturbance method shows great promise for heat transfer regulation in impingement flow.
Kai Liu,Xiaohang Zhang,Hao Wang,Xuwen He,Zhonghua Shangguan,Yali Shi,Shipeng Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
Composite carbon-based nano-zero-valent iron materials not only have excellent characteristics of nano materials, but also solve the difficulty of recycling nano materials after use, and overcome the shortcomings of the nano materials. The introduction of copper increases the redox reaction activity of the micro-electrolytic material and expands the applicable pH range of the reaction environment. In the range of pH = 3–9, the removal efficiency of dichloromethanesulfonic acid (Cl2-MSA) was maintained at 95.5–99.7% after 30 min. Continuous dynamic simulation experiments verified that the composite carbon-based nano zero-valent iron material has a stable removal effect on the target pollutants.
Yanzeng Dong,Xiaohang Yu,Zhiheng Wang,Xin Liu,Yanyan Liu,Ruiyao Gao,Songdong Yao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
Effects of HY addition on NiMoS active phase of NiMo(NH3) impregnated NiMo/Al2O3-HY and its role in4,6-dimethyl-dibenzothiophene hydrodesulfurization was investigated. The results show that HY canpromote HDS reaction by changing the morphology of NiMoS nanoclusters even when isomerization of4,6-DMDBT is not involved. In the absence of strong acid sites, TOF of NiMo/Al2O3 catalyst was stillimproved by 90%. XRD, H2-TPR, Raman, TEM, and XPS characterization show that proper metal supportinteraction caused by HY addition is beneficial to the formation of large-scale multilayer NiNoS clusters,the enrichment of Ni in NiMoS clusters and the increase of NiMoS active sites, thereby leading HDS catalystexhibiting highest intrinsic activity (TOF). However, too strong or too weak metal support interactionwill reduce intrinsic activity for HDS catalysts. When pH value of impregnation solution is 10, thestrong metal support interaction reduces layer numbers of NiMoS clusters. When pH value of impregnationsolution is 11, negative charge hinders the formation of NiMoS clusters. This not only leads to a furtherdecrease HYD pathway selectivity, but also significantly reduces the initial reaction rate of HDScatalyst.