Two-component zeolite-alumina system for toluene trapping with subsequent nonthermal plasma mineralization

Caihong Qin,Mengke Guo,Yang Zheng,Rui Yu,Jiayu Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-

Two-component zeolite-alumina packed dielectric barrier discharge plasma was developed to deeplymineralize toluene. Compared with packing ZSM-5 and g-Al2O3 separately in layers, uniform mixing ofZSM-5 and g-Al2O3 was more conducive to the mineralization of adsorbed toluene in nonthermal plasma. When the mixing ratio of ZSM-5 to g-Al2O3 was 1:2, the mineralization rate reached 80% afterdischarging for 120 min. Ag supported on the catalyst surface significantly improved the selectivity ofCO2. Increased relative humidity had little effect on the mineralization of adsorbed toluene, butsignificantly reduced the byproducts O3 and N2O. The adsorption and plasma mineralizationperformance of Ag/ZSM-5-g-Al2O3 duringfive cycles of toluene adsorption was stable with only thepeak concentration of CO showing a slight upward trend. GC–MS, TG, and XPS characterization of freshand used catalysts revealed deactivation of Ag/ZSM-5-g-Al2O3 in terms of CO oxidation due tointermediate organic residues and decreased amounts of Ag+ and lattice oxygen on the support ZSM-5instead of g-Al2O3.

Combined estrogen-progestin pill is a safe and effective option for endometrial hyperplasia without atypia: a three-year single center experience

Yang Wang,Victoria Nisenblat,Liyuan Tao,XinYu Zhang,Hongzhen Li,Caihong Ma 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.3

Objective: To evaluate the effectiveness of oral contraceptive pill (OCP) as therapy for endometrial hyperplasia (EH) without atypia in reproductive-aged women compared with oral progestin. Methods: A retrospective cohort study was carried out in our reproductive center. Consecutive patients diagnosed with infertility and non-atypical EH identified through electronic database who met inclusion criteria (n=309). Patients were assigned to two treatment groups: OCP (n=216) and oral progestin (n=93); clinical and reproductive outcomes were recorded. Results: Reversal of EH to normal endometrium, clinical pregnancy, live birth and miscarriage rate. Women in OCP group were younger, had higher prevalence of Polycystic Ovary Syndrome and other uterine pathology and longer duration of infertility than women in progestin group. Reversal of EH was observed in 93.52% women on OCP and in 86.02% women on progestin (p=0.032; adjusted odds ratio [aOR]= 2.35; 95% confidence interval [CI]=1.06-5.21) after the initial course of treatment for 2 to 6 months. Cyclic OCP (n=184) resulted in better response to treatment compared to continuous OCP (n=32) (95.11% vs. 84.38%; p=0.039; aOR =3.60; 95% CI =1.12-11.55). Clinical pregnancy rate in OCP group was marginally higher than progestin group (87/208, 41.83% vs. 27/90, 30.00%; p=0.054). Miscarriage (25.29% vs. 29.63%; p=0.654) and live birth rate (31.25% vs. 21.11%; p=0.074) were comparable between the groups. Conclusion: For the first time we demonstrate that OCP is an effective therapy for nonatypical EH and is associated with higher remission rate compared with oral progestin. Reproductive outcomes are reassuring and comparable between the two groups.

중국 내부 산업이전의 원인과 추세

김종락,양채홍 순천향대학교 사회과학연구소 2008 순천향 사회과학연구 Vol.14 No.1

Since China's revolution, China's economy has marked a substantial jumping, It has dramatically grown up 10% annually, but it also has shown a big gap between the riches and poors in the Eastern and the Central regions as well as between the urban and rural areas. Moreover, this gap has been getting bigger and bigger. To reduce the gap between the riches and the poors is one of the main issues that the government should challenge. The government of China has adjusted policies: "the West Development", "the Rise of the Central regions", to develop not only the Central regions but the Western. Especially current "Eleventh Five-Year Plan" attaches great importance to make great progress onto these regions. Because of many weaknesses having been imposed during the last decades: i.e., the rise of costs in the product factors in the Eastern regions, recent comparable developments in the Central and the Western regions, some enterprises of the Eastern regions are shifting toward the Central and the Western areas, The advantages of the geographic location, rich resources, cheap labour forces and lands, have attracted many investors. Beginning from the last year, Taiwanese and Japanese enterprises have already moved to the Central regions from the Eastern. At this point, Korean enterprises also should hurry up to seek a chance to have a momentum of getting the labor intensive industries in this Central regions. Under these circumstances, Korea enterprises which invested or will invest on China have to develop proper strategies to cope with these dramatical changes happening in China. We will analyse the investment environment of the Central regions, and find the solutions to guide for Korean enterprises to plan proper strategies 1978년 중국 개혁·개방 추진한 덩샤오핑(鄧小平)은 '선부론' 이라는 기본 전제와 국가통제위주의 정책으로 경제를 발전시켰다. 과거 30년 동안 연평균 10%정도의 놀라운 경제성장을 지속해왔지만 도시와 농촌, 동부와 중·서부지역, 자본가와 근로자 등의 빈부격차는 갈수록 확대되고 있다. 이러한 결과를 치유하기 위해 중국정부는 '선부론'을 폐기하고 '공부론'을 내세워 낙후된 중·서부지역의 발전을 이끌고자 한다. 그의 일환으로는 외국인투자유치정책의 변화이다. 2000년부터 시작된 중 ·서부지역에 대한 정부차원의 인센티브와 '서부대개발', '중부굴기'등 지역 균형발전정책이 시행됐다. 게다가 동부 연해지역의 인건비 상승, 저가가공제한, 세금혜택 축소, 환경규제강화 등 이유로 국내산업은 중·서부지역으로 이전하기 시작했다. 이러한 투자환경의 변화는 국내 외 투자자에 많은 과제를 주며 빠르게 진행하고 있다. 본 논문에서는 중국내부 산업이전의 원인과 추세를 분석하고, 한국투자자들에게 시사점을 제시하려고 한다.

Numerical investigation on the effect of baffles on liquid sloshing in 3D rectangular tanks based on nonlinear boundary element method

Guan, Yanmin,Yang, Caihong,Chen, Ping,Zhou, Li The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.-

The numerical simulation of liquid sloshing in the three-dimensional tanks under horizontal excitation and roll excitation was carried out, and the inhibition effect of different baffles on the sloshing phenomenon was investigated. The numerical calculations were carried out by the nonlinear Boundary Element Method (BEM) with Green's theorem based on the potential flow, which was conducted with the governing equation corresponding to the boundaries of each region. The validity of the method was verified by comparing with experimental values and published literatures. The horizontal baffle, the vertical baffle and the T-shaped baffle in the sloshing tanks were investigated respectively, and the baffles' position, dimension and the liquid depth were provided and discussed in detail. It is drawn that the baffle shape plays a non-negligible role in the tank sloshing. The vertical baffle is a more effective way to reduce the sloshing amplitude when the tank is under a horizontal harmonic excitation while the horizontal baffle is a more effective way when the tank is under a roll excitation. The amplitude of free surface elevation at right tank wall decreases with the increasing of the horizontal baffle length and the vertical baffle height. Although the T-shaped baffle has the best suppression effect on tank sloshing under horizontal excitation, it has limited suppression effect under roll excitation and will complicate the sloshing phenomenon when changing baffle height.

Numerical investigation on the effect of baffles on liquid sloshing in 3D rectangular tanks based on nonlinear boundary element method

Guan, Yanmin,Yang, Caihong,Chen, Ping,Zhou, Li The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1

The numerical simulation of liquid sloshing in the three-dimensional tanks under horizontal excitation and roll excitation was carried out, and the inhibition effect of different baffles on the sloshing phenomenon was investigated. The numerical calculations were carried out by the nonlinear Boundary Element Method (BEM) with Green's theorem based on the potential flow, which was conducted with the governing equation corresponding to the boundaries of each region. The validity of the method was verified by comparing with experimental values and published literatures. The horizontal baffle, the vertical baffle and the T-shaped baffle in the sloshing tanks were investigated respectively, and the baffles' position, dimension and the liquid depth were provided and discussed in detail. It is drawn that the baffle shape plays a non-negligible role in the tank sloshing. The vertical baffle is a more effective way to reduce the sloshing amplitude when the tank is under a horizontal harmonic excitation while the horizontal baffle is a more effective way when the tank is under a roll excitation. The amplitude of free surface elevation at right tank wall decreases with the increasing of the horizontal baffle length and the vertical baffle height. Although the T-shaped baffle has the best suppression effect on tank sloshing under horizontal excitation, it has limited suppression effect under roll excitation and will complicate the sloshing phenomenon when changing baffle height.

Seeing the World: Photoreaction and Photosensory Mechanisms of Cordyceps militaris

Wang Fen,Yang Tao,Dong Caihong 한국버섯학회 2017 버섯 Vol.21 No.2

Light is a necessary environmental factor for stroma formation and development of Cordyceps militaris, a well-known edible and medicinal fungus. In this study, photo morphogenesis and the blue-light receptor gene were studied using five representative strains of C. militaris. The results suggest that light was essential for colony pigmentation and could promote conidia production. Cmwc-1 gene inactivation results in thicker aerial hyphae, disordered fruit body development, a significant reduction in conidial formation, and carotenoid and cordycepin production. These characteristics were restored when the ΔCmwc-1 strains were hybridized with wild-type strains of the opposite mating type. A genomewide expression analysis revealed that there were 1042 light responsive genes in the wild-type strain and only 458 in the ΔCmwc-1 strain. Among five putative photoreceptors identified, Vivid, cryptochrome-1, and cyclobutane pyrimidine dimer photolyase are strongly induced by light in a Cmwc-1- dependent manner, while phytochrome and cryptochrome-2 were not induced. The transcription factors involved in the fungal light reaction were mainly of the Zn2Cys6 type. CmWC-1 regulates adenylosuccinate synthase, an important enzyme for adenosine de novo synthesis, which could explain the reduction in cordycepin production. Some G proteincoupled receptors that control fungal fruit body formation and the sexual cycle were regulated by CmWC-1, and the cAMP pathway involved in light signal transduction in N. crassa was not critical for the photoreaction in the fungus here. A transcriptional analysis indicated that steroid biosynthesis was more active in the ΔCmwc-1 strain, suggesting that CmWC-1 might switch the vegetative growth state to primordia differentiation by suppressing the expression of related genes.

Characterization and catalytic application of MnCl2 modified HZSM-5 zeolites in synthesis of aromatics from syngas via dimethyl ether

Qingde Zhang,Yisheng Tan,Caihong Yang,Hongjuan Xie 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3

The conversion of syngas to aromatics via dimethyl ether was investigated over MnCl2 modified HZSM-5zeolites. The results demonstrated that 2%MnCl2 modified HZSM-5 (SiO2/Al2O3 = 38) exhibited higher pxylene selectivity than other catalysts and further decreased 1,2,4,5-tetramethylbenzene selectivity. The CO conversion was obviously increased after 5%MnCl2 modification to HZSM-5. The catalysts were characterized by XRD, BET, XPS, FT-IR, NH3-TPD, SEM, element analysis and O2-TPO. The loading amount of MnCl2 affected the adsorption and reaction of DME molecules on zeolites. Appropriate amount of MnCl2 introduction could adjust the acidity and pore volume of HZSM-5 to increase p-xylene selectivity and CO conversion.

Variations of SSU rDNA Group I Introns in Different Isolates of Cordyceps militaris and the Loss of an Intron during Cross-Mating

Tiantian Lian,Tao Yang,Junde Sun,Suping Guo,Huaijun Yang,Caihong Dong 한국미생물학회 2014 The journal of microbiology Vol.52 No.8

Cordyceps militaris, the type species of genus Cordyceps, isone of the most popular mushrooms and a nutraceutical ineastern Asia. It is considered a model organism for thestudy of Cordyceps species because it can complete its lifecycle when cultured in vitro. In the present study, the occurrenceand sequence variation of SSU rDNA group I introns,Cmi.S943 and Cmi.S1199, among different isolatesof C. militaris were analyzed. Based on the secondary structurepredictions, the Cmi.S943 intron has been placed insubgroup IC1, and the Cmi.S1199 intron has been placedin subgroup IE. No significant similarity between Cmi.S943and Cmi.S1199 suggested different origins. Three genotypes,based on the frequency and distribution of introns, were describedto discriminate the 57 surveyed C. militaris strains. It was found that the genotype was related to the stromacharacteristics. The stromata of all of the genotype II strains,which possessed only Cmi.S943, could produce perithecium. In contrast, the stromata of all genotype III strains, whichhad both Cmi.S943 and Cmi.S1199, could not produce perithecium. Cmi.S1199 showed the lowest level of intra-specificvariation among the tested strains. Group I introns can belost during strain cross-mating. Therefore, we presumed thatduring cross-mating and recombination, intron loss could bedriven by positive Darwinian selection due to the energeticcost of transcribing long introns.

Correlation between Vitamin B12 and Mental Health in Children and Adolescents: A Systematic Review and Meta-analysis

Yongjun Tan,Li Zhou,Kaiqi Gu,Caihong Xie,Yuhan Wang,Lijun Cha,Youlin Wu,Jiani Wang,Xiaosong Song,Xia Chen,Hua Hu,Qin Yang 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.4

To conduct the association between vitamin B12 and mental health in children and adolescents. Five databases were searched for observational studies in any language reporting on mental health and vitamin B12 levels or intake in children and adolescents from inception to March 18, 2022. Two authors independently extracted data and assessed study quality. Qualitative and quantitative analysis of data were performed. The review was registered in the PROSPERO database (CRD42022345476). Fifty six studies containing 37,932 participants were identified in the review. Vitamin B12 levels were lower in participants with autism spectrum disorders (ASD) (standardized mean difference [SMD], −1.61; 95% confidence interval [95% CI], −2.44 to −0.79; p < 0.001), attention deficit hyperactivity disorders (SMD, −0.39; 95% CI, −0.78 to −0.00; p = 0.049) compared with control group. Vitamin B12 intake were lower in participants with ASDs (SMD, −0.86; 95% CI, −1.48 to −0.24; p = 0.006) compared with control group, but showed no difference between depression group (SMD, −0.06; 95% CI, −0.15 to 0.03; p = 0.17) and the control group. Higher vitamin B12 intake were associated with lower risk of depression (odds ratio [OR], 0.79; 95% CI, 0.63−0.98; p = 0.034) and behavioral problems (OR, 0.83; 95% CI, 0.69−0.99; p = 0.04). The vast majority of included studies supported potential positive influence of vitamin B12 on mental health, and vitamin B12 deficiency may be a reversible cause for some mental health disorders in children and adolescents.

Promotional effects of Sm2O3 on Mn-H4SiW12O40/SiO2 catalyst for dimethyl ether direct-oxidation to dimethoxymethane

Qingde Zhang,Yizhuo Han,Yisheng Tan,Guangbo Liu,Caihong Yang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

The promotional effects of Sm2O3 on Mn-H4SiW12O40/SiO2 for dimethyl ether (DME) direct-oxidation to dimethoxymethane (DMM) were investigated. The results showed that Sm2O3 introduction could significantly improve the activity of Mn-H4SiW12O40/SiO2 for DMM formation, and DMM selectivity was remarkably increased from 36.3% to 60.3% when the Sm2O3 content was 1%. The catalysts were characterized by ICP-AES, XRD, NH3-TPD, Pyridine-IR and XPS. The Sm2O3 introduction enhanced the number of Lewis acid sites and weak acid sites and also increased the amount of Mn4+ species of Mn-H4SiW12O40/SiO2, which is favorable for the formation of DMM.