Adsorption removal of pefloxacin from water by halloysite nanotubes

Cong-Liang Zhang,Shu-Jie Cui,Yan Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-

Batch adsorption experiments were carried out for the removal of pefloxacin from water using halloysite nanotubes as adsorbent. The effects of various parameters such as contact time, initial solution concentration and temperature on the adsorption system were investigated. The optimum contact time was found to be 100 min. The isotherm adsorption data fit well with Freundlich model, and the kinetic data fit well with the pseudo-second order and the intra-particle diffusion model. Intra-particle diffusion analysis demonstrates that pefloxacin diffuses quickly among the particles at the beginning of the adsorption process, and then the diffusion slows down and stabilizes. Thermodynamic parameters such as DG, DH and DS were also calculated. The negative Gibbs free energy change and the positive enthalpy change indicated the spontaneous and endothermic nature of the adsorption, and the positive entropy change indicated that the adsorption process was aided by increased randomness

Risk factors for and delayed recognition of genitourinary fistula following radical hysterectomy for cervical cancer: a population-based analysis

Cong Liang,Ping Liu,Shan Kang,Weili Li,BiLiang Chen,Mei Ji,Chunlin Chen 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.2

Objective: This study aimed to identify the risk factors for genitourinary fistulas and delayed fistula recognition after radical hysterectomy for cervical cancer. Methods: This study was a retrospective analysis of data collected in the Major Surgical complications of Cervical Cancer in China (MSCCCC) database from 2004–2016. Data on sociodemographic characteristics, clinical characteristics, and hospital characteristics were extracted. Differences in the odds of genitourinary fistula development were investigated with multivariate logistic regression analyses, and differences in the time to recognition of genitourinary fistula were assessed by Kruskal–Wallis test. Results: In this study, 23,404 patients met the inclusion criteria. Surgery in a cancer center, a women’s and children’s hospital, a facility in a first-tier city, or southwest region, stage IIA, type C1 hysterectomy, laparoscopic surgery and ureteral injury were associated with a higher risk of ureterovaginal fistula (UVF) (p<0.050). Surgery in southwest region, bladder injury and laparoscopic surgery were associated with greater odds of vesicovaginal fistula (VVF) (p<0.050). Surgery at cancer centers and high-volume hospitals was associated with an increase in the median time to UVF recognition (p=0.016; p=0.005). International Federation of Gynecology and Obstetrics (FIGO) stage IIA1-IIB was associated with delayed recognition of VVF (p=0.040). Conclusion: Intraoperative urinary tract injury and surgical approach were associated with differences in the development of UVFs and VVFs. Patients who underwent surgery in cancer centers and high-volume hospitals were more likely to experience delayed recognition of UVF. Patients with FIGO stage IIA1-IIB disease were more likely to experience delayed recognition of VVF.

퇴계의 “체용유이(體用有二)” 설에 대한 소견

량총어 ( Liang Cong-e ) 연민학회 2019 연민학지 Vol.31 No.-

In the context of discussing Zhu Xi's and Shao Yong's theory of Ti and Yong, Yi Hwang put forward the viewpoint of dual Ti-Yong theory, which holds that there are transcendental Ti-Yong theory and phenomenal Ti-Yong theory. This expression contains the third meaning of the relationship between Ti and Yong: noumenon and phenomenon, which also have the relationship between Ti and Yong. By examining the original meaning of Zhu Xi's and Shao Yong's Ti-Yong theory, we can conclude that dual Ti-Yong theory is Yi Hwang's creative interpretation, because Zhu Xi's Ti-Yong theory refers to body and function, which is close to Yi Hwang's so-called phenomenal theory of Ti-Yong; Shao Yong's Ti-Yong theory refers to the role of the human mind, which is fundamentally different from Yi Hwang's Ti-Yong theory.

Characterization of proteinase A excretion from Saccharomyces cerevisiae in high sugar stress conditions

Liang Dong,Feng Li,Yongzhe Piao,Dong Sun,Rui Zhao,Cheng Li,Lina Cong,Changxin Zhao 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.2

High sugar concentration culturing was commonly used in modern fermentation industry. However, it leads to the reduction of the foam stability in beer brewing due to the excess secretion of proteinase A. To better understand the characterization of proteinase A excretion from Saccharomyces cerevisiae in high sugar stress conditions, the cultures were grown by using YNB medium with a high concentration of glucose. Pro-PrA isolated from the medium was purified by gel exclusion chromatography, and the PrA activity was detected using fluorescent substrate analysis. The relative molecular weight of the purified PrA and pro-PrA was estimated at 42 and 54 kDa, respectively, by SDS-PAGE. It indicated that the metabolic behavior of PrA in the high glucose culturing was quite different from the normal conditions, and glucose concentration may have a big influence on its secreted process. Further study showed that PrA was released at the logarithmic growth phase of the culturing, and the amount of PrA was 11 times higher compared with the normal culturing. PrA was considered to be activated by itself under acidic conditions. And it was also confirmed in this work that the step-wise pathway for the autoactivation known as a pseudo-PrA has a major contribution to the autoactivation process of PrA zymogen outside the cell.

The Stent-Assisted Coil-Jailing Technique Facilitates Efficient Embolization of Tiny Cerebral Aneurysms

Cong-Hui Li,Xian-Hui Su,Bo Zhang,Yong-Feng Han,Er-Wei Zhang,Lei Yang,Dong-Liang Zhang,Song-Tao Yang,Zhen-Quan Yan,Bu-Lang Gao 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.6

Objective: Tiny cerebral aneurysms are difficult to embolize because the aneurysm’s sac is too small for a single small coil, and coils within the aneurysm may escape from the confinement of a stent. This study was performed to introduce the stent-assisted coil-jailing technique and to investigate its effect on the coil embolization of tiny intracranial aneurysms. Materials and Methods: Sixteen patients with tiny intracranial aneurysms treated with the stent-assisted coil-jailing technique between January 2011 and December 2013 were retrospectively reviewed and followed-up. Results: All aneurysms were successfully treated with the coil-jailing technique, and at the end of embolization, complete occlusion of the aneurysm was achieved in 9 cases (56.3%), incomplete occlusion in 6 (37.5%), and partial occlusion in 1 (6.3%). Intraprocedural complications included acute thrombosis in one case (6.3%) and re-rupture in another (6.3%). Both complications were managed appropriately with no sequela. Follow-up was performed in all patients for 3–24 months (mean, 7.7 months) after embolization. Complete occlusion was sustained in the 9 aneurysms with initial complete occlusion, progressive thrombosis to complete occlusion occurred in the 6 aneurysms with initial near-complete occlusion, and one aneurysm resulted in progressive thrombosis to complete occlusion after initial partial occlusion. No migration of stents or coils occurred at follow-up as compared with their positions immediately after embolization. At follow-up, all patients had recovered with no sequela. Conclusion: The stent-assisted coil-jailing technique can be an efficient approach for tiny intracranial aneurysms, even though no definite conclusion regarding its safety can be drawn from the current data.

Integrated passive device fabricated and chip-on-board packaged filter employing mixed electric-magnetic coupling scheme

Liang, Jun-Ge,Wang, Cong,Kim, Nam-Young Institution of Electrical Engineers 2018 IET microwaves, antennas & propagation Vol.12 No.14

Thermo-hydraulic performance of nanofluids in a bionic fractal microchannel heat sink with traveling-wave fins

Cong Qi,Liang Sun,Yuxing Wang,Chengchao Wang,Genglin Chen 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8

Aiming at high working power and heat dissipation of electronic components, this study developed a novel bionic fractal microchannel heat sink with traveling-wave fins based on fractal theory and disk-like tree-like structure. -Al2O3-water nanofluid was chosen as the working fluid instead of water in the microchannel heat sink. Thermohydraulic performance of nanofluids in the bionic fractal microchannel heat sink with traveling-wave fins was simulated numerically, and its comprehensive performance was studied. The main control parameters of this study include the depths of the traveling wave structure (h=0.00005 m, 0.00010m, 0.00015 m, 0.00020 m, 0.00025 m), the eccentricity ratios of the traveling wave structure (e=0, 0.1, 0.2, 0.3, 0.4) and Reynolds numbers (Re=200-1,000). Results indicate that the surface temperature of the microchannel heat sink decreases with Reynolds number and depth of traveling wave structure. The use of traveling ribs at fractal corners can convert the inhomogeneous flow caused by the fractal effect into a stable horizontal channel flow more efficiently, while the temperature uniformity increases with depth and eccentricity ratio. Results also show that the traveling wave structure has the best overall performance when the eccentricity ratio of the traveling wave structure is 0.1 or 0.2, and the depth is 0.00020 m or 0.00025 m.

Thickness effects of aerosol deposited hygroscopic films on ultra-sensitive humidity sensors

Liang, Jun-Ge,Kim, Eun-Seong,Wang, Cong,Cho, Myung-Yeon,Oh, Jong-Min,Kim, Nam-Young Elsevier 2018 Sensors and actuators. B Chemical Vol.265 No.-

<P><B>Abstract</B></P> <P>Hygroscopic film that has a super mesoporous structure exhibits high sensitivity and fast response/recovery in humidity sensing applications. Aerosol deposition (AD) via a shock-loading-solidification preparation mechanism, which is an unexplored potential hygroscopic film preparation technique, can produce a porous microstructure, and the AD hammering effect creates various interior and surface microstructures in different-thickness films. The objective of our study was to verify the feasibility of using AD as a humidity-sensing film preparation technique, and to investigate the thickness effects of the film on its microstructure and hygroscopic properties. Hygroscopic films with thicknesses ranging from 0.1–10.0 μm were aerosol deposited with BaTiO<SUB>3</SUB> powders before undergoing a 400 °C thermal treatment. The resulting surface morphology exhibited roughness increases for thicknesses from 0.1–6.0 μm, and a decrease at 10.0 μm. The cross-sectional structure was characterized by a transitional-density grain distribution in which higher density small-sized grains could be seen in the bottom layer. Films with thicknesses of 1.5 μm and 3.0 μm achieved excellent sensitivities of 178.6 ± 7.3 pF/%RH and 299.9 ± 5.4 pF/%RH, respectively. Further, the response and recovery time for the 1.5 μm film were both less than 5 s. The current study determined the feasibility of AD-based humidity-sensing film preparation and provided a reference for optimal thickness control. The surface hydrophilicity, pore volume, and open-pore ratio were analyzed as critical factors of the thickness related humidity sensing effects, and physical modeling indicated that AD-prepared films exhibited an expanded humidity detection range, enhanced water vapor adsorption and desorption, and improved sensitivity to humidity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aerosol deposition can be used to prepare ultra-sensitive ceramic humidity sensors. </LI> <LI> Film-based sensors were prepared using a shock-loading solidification mechanism of aerosol deposition. </LI> <LI> Their sensitivity depends on the hydrophilicity, pore volume, and open-pore ratio. </LI> <LI> The thickness of the film regularly affects the humidity-sensing properties. </LI> </UL> </P>

Preparation of Ultrasensitive Humidity-Sensing Films by Aerosol Deposition

Liang, Jun-Ge,Wang, Cong,Yao, Zhao,Liu, Ming-Qing,Kim, Hong-Ki,Oh, Jong-Min,Kim, Nam-Young American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.1

<P>Aerosol deposition (AD) is a novel ceramic film preparation technique exhibiting the advantages of room-temperature operation and highly efficient film growth. Despite these advantages, AD has not been used for preparing humidity-sensing films. Herein, room-temperature AD was utilized to deposit BaTiO<SUB>3</SUB> films on a glass substrate with a Pt interdigital capacitor, and their humidity-sensing performances were evaluated in detail, with further optimization performed by postannealing at temperatures of 100, 200, ..., 600 °C. Sensor responses (i.e., capacitance variations) were measured in a humidity chamber for relative humidities (RHs) of 20-90%, with the best sensitivity (461.02) and a balanced performance at both low and high RHs observed for the chip annealed at 500 °C. In addition, its response and recovery were extremely fast, respectively, at 3 and 6 s and it kept a stable recording with the maximum error rate of 0.1% over a 120 h aging test. Compared with other BaTiO<SUB>3</SUB>-based humidity sensors, the above chip required less thermal energy for its preparation but featured a more than 2-fold higher sensitivity and a superior detection balance at RHs of 20-90%. Cross-sectional transmission electron microscopy imaging revealed that the prepared film featured a transitional variable-density structure, with moisture absorption and desorption being promoted by a specific capillary structure. Finally, a bilayer physical model was developed to explain the mechanism of enhanced humidity sensitivity by the prepared BaTiO<SUB>3</SUB> film.</P> [FIG OMISSION]</BR>

The Effect of Light-Beam Wobble on the Noise Characteristics for an Optical Disk

Cong-Hui Xu,Yu-Xiang Zheng,Liang-Yao Chen,Rong-Jun Zhang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I

The laser beam is usually perpendicular to the optical disk during operation; however, for various reasons, the laser beam may diverge from the normal state with respect to the optical disk, which will cause an unsteadiness in the reflection of the light, and may lead to system noise. In this paper, we simulate the process of such an influence by adding a random variable to the incidence angle of the laser beam by combining an optical-matrix method with the Monte Carlo method. After careful analysis, we put forward some new structures to obtain a high signal-to-noise ratio (SNR) for a certain wavelength of the laser.