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Thermodynamic Investigation of Methanol and Dimethyl Ether Synthesis from CO2 Hydrogenation
Shen, Wen Jie,Jun, Ki Won,Choi, Ho Suk,Lee, Kyu Wan 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.2
The thermodynamics involved in the catalytic hydrogenation of CO₂ have been examined extensively. By assuming that methanol and dimethyl ether (DME) are the main products, two reaction systems each consisting of two pararell reactions were analyzed and compared in terms of the equilibrium yield and selectivity of the useful products, methanol and DME. The calculation results demonstrated that the production of DME allows much higher oxygenate yield and selectivity than that of methanol.
Applying Boolean logic algorithm for photomask pattern design
Wen-Hsing Kao,Bo-Shen Liou,Wen-Hsiang Shen,Yung-Lung Tsou 한국정보기술융합학회 2013 JoC Vol.4 No.2
The reason for the trend in high-level large-area photomasks is that mask size is becoming larger and the line size and gap design is becoming thinner. In addition, the uniformity requirements for producing photomasks are becoming stricter. Consequently, the difficulties faced in manufacturing photomasks have substantially increased and a particular graphic process is required to assist with improving the yield of photomask production. During the etching process of mask production, a non-uniform etching rate produces an inferior uniformity of the critical dimensions. The reasons for the inferior etching rate results include the uniformity of the photomask pattern, the spin speed of the etching machine, and the nozzle of the etching arms. This research focuses on the photomask pattern line-width compensation for improving uniformity and precision. The research combines logical operations to select the patterns that are necessary for special compensation, adding the appropriate compensation value to the pattern and combining it with the original pattern to generate a complete photomask pattern to compensate for the inferior etching rate that produces inferior line-width uniformity.
Cloning and sequence analysis of Wild Argali short palate, lung and nasal epithelium clone 1 cDNA
Wen Shen,Kaili Chen,Yanming Sun,Haiying Guo,Dongmei Chen,Yang Cao 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.5
Objective: Experiments were conducted to clone the sequence of Wild Argali short palate, lung and nasal epithelium clone 1 (SPLUNC1) cDNA, and to lay the foundation for further study the biological function of Wild Argali SPLUNC1. Methods: The complete sequence of Wild Argali SPLUNC1 cDNA was generated by rapid amplification of cDNA ends. The entire coding sequence was inserted into the pPIC9K vector and expressed in Pichia pastoris (P. pastoris) GS115. The recombinant SPLUNC1 protein was detected by Western blot and purified by Ni2+ chelate affinity chromatography. The test of effect of the protein on Mycoplasma ovipneumoniae (MO) was performed with real-time polymerase chain reaction. Results: The Wild Argali SPLUNC1 cDNA was 1,076 bp with an open reading frame of 768 bp, which encoded a 26.49 kDa protein composed of 255 amino acids. Its amino acid sequence shared 98.4%, 96.9%, 94.5%, 90.2%, 80.8%, 78.4%, 78.3%, 72.5%, 72.3%, 68.8% identity with those of SPLUNC1 cDNA from Ovis aries (accession no. NP_001288334.1), Capra hircus (accession no. XP_005688516.1), Pantholops hodgsonii (accession no. XP_005979709.1), Bos taurus (accession no. NP_776851.1), Felis catus (accession no. XP_006929910.1), Homo sapiens (accession no. NP_001230122.1), Sus scrofa (accession no. NP_001005727.1), Chinchilla lanigera (accession no. NP_001269294.1), Mus musculus (accession no. NP_035256.2), and Rattus norvegicus (accession no. NP_742028.1), respectively. The recombinant protein corresponded to the expected molecular mass of 25.47 kDa as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and it was detected in the supernatant of P. pastoris, and it could be purified. The results from the test of inhibition effect of argali recombinant SPLUNC1 protein on MO showed that the product could inhibit MO very well (p<0.01). Conclusion: The amino acid sequence of Wild Argali SPLUNC1 was different from other organisms. The recombinant SPLUNC1 protein has good biological activity.
Wen, Chun-Jie,Wu, Lan-Xiang,Fu, Li-Juan,Shen, Dong-Ya,Zhang, Xue,Zhang, Yi-Wen,Yu, Jing,Zhou, Hong-Hao Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.1
Estrogens are considered the major breast cancer risk factor, and the carcinogenic potential of estrogens might be attributed to DNA modification caused by derivatives formed during metabolism. $17{\beta}$-estradiol ($E_2$), the main steroidal estrogen present in women, is metabolized via two major pathways: formation of 2-hydroxyestradiol (2-OH $E_2$) and 4-hydroxyestradiol ($4-OH\;E_2$) through the action of cytochrome P450 (CYP) 1A1 and 1B1, respectively. Previous reports suggested that $2-OH\;E_2$ has putative protective effects, while $4-OH\;E_2$ is genotoxic and has potent carcinogenic activity. Thus, the ratio of $2-OH\;E_2/4-OH\;E_2$ is a critical determinant of the toxicity of $E_2$ in mammary cells. In the present study, we investigated the effects of berberine on the expression profile of the estrogen metabolizing enzymes CYP1A1 and CYP1B1 in breast cancer MCF-7 cells. Berberine treatment produced significant induction of both forms at the level of mRNA expression, but with increased doses produced 16~ to 52~fold greater induction of CYP1A1 mRNA over CYP1B1 mRNA. Furthermore, berberine dramatically increased CYP1A1 protein levels but did not influence CYP1B1 protein levels in MCF-7 cells. In conclusion, we present the first report to show that berberine may provide protection against breast cancer by altering the ratio of CYP1A1/CYP1B1, could redirect $E_2$ metabolism in a more protective pathway in breast cancer MCF-7 cells.
Wen-Zhe Shen,Yi Ma,Yaochun Yao,Feng Liang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8
Ni-rich Li(Ni0.8Co0.1Mn0.1)O2 cathode material is widely recognized as one of the most cathode materials for lithium-ion batteries due to its high specific capacity, high energy density and low cost. In this paper, the NCM cathode material precursor Ni0.8Co0.1Mn0.1(OH)2 was prepared by coprecipitation method and the optimum experimental conditions were investigated. The effects of water bath temperature on the electrochemical performances of the prepared materials were investigated by controlling the morphology. The results showed that 60 ℃ was the best bath temperature for the precursor which has a regular spheroidal morphology and uniform particles with the diameter of 10 μm. After coprecipitation, the samples calcined under oxygen atmosphere displayed good electrochemical properties. The discharge specific capacity is up to 194 mA · h · g -1 and 134 mA · h · g -1 at 0.2 ℃ and 5 ℃, respectively. The initial coulombic efficiency is 87.57% at 0.2 ℃.
( Jiao Wen Shen ),임윤희 ( Yun Hui Lim ),조영민 ( Young Min Jo ) 한국공업화학회 2011 공업화학 Vol.22 No.2
본 연구에서는 화학적 공침법을 적용하여 가스상 이산화탄소 분해를 위한 나노크기의 M-페라이트(M=Co, Ni, Cu, Zn)를 제조하였다. 열중량 분석 결과, 시험제조한 모든 시료의 최고 무게 감소율은 350 ℃ 미만에서 발생하였다. 소성온도가 증가할수록 결정형은 우수하여 표면촉매활성화를 기대할 수 있지만, 입자결정의 크기가 크고, 비표면적이 낮은 페라이트가 합성됨을 알 수 있었다. FT-IR 분석으로부터 375~406 cm-1의 범위에서 octahedral site에 착화물이 존재함을 확인 할 수 있었으며, 이는 페라이트 내 스피넬 구조가 형성되어 있음을 보여주는 것이라고 믿는다. 본 연구로부터 얻은 이산화탄소 분해반응을 위한 금속페라이트의 최적 열처리 온도는 500 ℃인 것으로 나타났다. In this work, nano-sized M-ferrites (M=Co, Ni, Cu, Zn) for the decomposition of carbon dioxide were synthesized by the chemical co-precipitation. From the thermogravimetric analysis, it was clear that the maximum weight loss of each sample took place below 350 ℃. High temperature calcination resulted in more systematic crystallines, smaller specific surface area and larger particle size. An analysis by FTIR in the range of 375~406 cm-1 revealed the presence of chelates at the octahedral site, which implies the formation of spinel structure in the ferrites. The current work showed that a 500 ℃ is the optimum heat treatment temperature of metal ferrites for CO2 decomposition reaction.
沈文凡(Shen Wen fan),??(Nie Yao) 동아인문학회 2010 동아인문학 Vol.18 No.-
Our ancient Poetry Talks were about the discussion of poem, poet, the orgin of the poem, the comment of the poem and so on, which gradually become more and more important in the study of ancient poems. Poetry Talks in Korea collect a large number of our ancient poems which are better literature value and historical status and the worthy of our attention is its unique comments. This thesis selects the “SHI JIA DIAN DENG LU TAO” which was wrriten by Li Gui-jing as study object and takes nature as the central idea which revolves the clue of real, aesthetic and perfect as investigation and argumnetation. Tao Yuan-ming is an natural poet and philosopher and his poems are full of emotion and logic. Many writers inherits Tao Yuan-ming’s poems and thinking. This thesis focuses the natural life consciousness and cultural contents of the poems of Tao Yuan-ming for the purpose of addition on the study of the poems’ of Tao Yuan-ming.