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Formaldehyde degradation by UV/TiO_2/O_3 process using continuous flow mode

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Journal of Environmental Sciences 2007年第9期19卷 1136-1140页

作者： QI Hong SUN De-zhi chi Guo-qing School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China.

The degradation of formaldehyde gas was studied using UV/TiO2/O3 process under the condition of continuous flow mode. The effects of humidity, initial formaldehyde concentration, residence time and ozone adding amount on degradation of formaldehyde gas were investigated. The experimental results indicated that the combination of ozonation with photocatalytic oxidation on the degradation of formaldehyde showed a synergetic action, e.g,, it could considerably increase decomposing of formaldehyde. The degradation efficiency of formaldehyde was between 73.6% and 79.4% while the initial concentration in the range of 1.84--24 mg/m^3 by O3/TiO2flJV process. The optimal humidity was about 50% in UV/TiO2/O3 processs and degradation of formaldehyde increases from 39.0% to 94.1% when the ozone content increased from 0 to 141 mg/m^3. Furthermore, the kinetics of formaldehyde degradation reaction could be described by Langmuir-Hinshelwood model. The rate constant k of 46.72 mg/（m^***） and Langmuir adsorption coefficient K of 0.0268 m^3/mg were obtained.

关键词： UV/TiO2/O3 process formaldehyde continuous flow mode

Dependence of switching process on the perpendicular magnetic anisotropy constant in P-MTJ

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chinese Physics B 2018年第9期27卷 635-638页

作者： Mao-Sen Yang Liang Fang Ya-qing chi State Key Laboratory of High-Performance Computing College of ComputerNational University of Defense TechnologyChangsha 410073China institute of Microelectronics College of ComputerNational University of Defense TechnologyChangsha 410073China

We investigate the dependence of the switching process on the perpendicular magnetic anisotropy （PMA） constant in perpendicular spin transfer torque magnetic tunnel junctions （P-MTJs） using micromagnetic simulations. It is found that the final stable states of the magnetization distribution of the free layer after switching can be divided into three different states based on different PMA constants： vortex, uniform, and steady. Different magnetic states can be attributed to a trade-off among demagnetization, exchange, and PMA energies. The generation of the vortex state is also related to the non-uniform stray field from the polarizer, and the final stable magnetization is sensitive to the PMA constant. The vortex and uniform states have different switching processes, and the switching time of the vortex state is longer than that of the uniform state due to hindrance by the vortex.

关键词： magnetic tunnel junction perpendicular magnetic anisotropy vortex state micromagnetic simula-tion

Studies on the Reaction Mechanism of Br_2+I_2=2IBr

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chinese Journal of Structural Chemistry 2006年第10期25卷 1280-1286页

作者： ZHAO Hui-Ming YUAN Li-Xia YANG Guo-Ying SUN De-Sheng WANG Zun-Yao chi qing-qing School of Biological and Chemical Engineering Jiaxing University Jiaxing Zhejiang 314001 China School of Science Nanjing University of Technology Jiangsu 210009 China

The reaction mechanism of Br2 ＋ I2 = 2IBr was investigated at the （U）MP2/3-21G^＊ level, and one four-centred transition state as well as two three-atom molecules （IBr2,I2Br） were thus obtained. The same result was achieved by comparing the activation energy of three reaction paths, i.e., the minimum activation energy of the bimolecular elementary reaction Br2 ＋ I2 = 2IBr is less than the dissociation energy of Br2 or I2. It is thus theoretically proved that the title reaction occurs more easily in the bimolecular form without light initiation. However, once the reaction system was initiated by light through the reaction path of Br atom reacting with I2 or I atom reacting with Br2, the title reaction was completed quickly, which was verified with absorbance measurement at 516 nm in the present study.

关键词： bromine iodine iodine bromide transition state reaction mechanism spectrophotometry

N,N-二乙基对苯二胺分光光度法检测生活饮用水中硫化物的注意事项探析

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实验室检测

实验室检测 2024年第6期2卷 153-156页

作者：刘驰青马加翠耿发梅昆明市五华区疾病预防控制中心

目的通过实验分析并总结影响使用N,N-二乙基对苯二胺分光光度法进行水中硫化物测定的因素和注意事项。方法采用N,N-二乙基对苯二胺分光光度法检测水中硫化物，用已知硫化物含量的标准样品验证方法准确性和精密度，对实验过程中的各个... 详细信息

目的通过实验分析并总结影响使用N,N-二乙基对苯二胺分光光度法进行水中硫化物测定的因素和注意事项。方法采用N,N-二乙基对苯二胺分光光度法检测水中硫化物，用已知硫化物含量的标准样品验证方法准确性和精密度，对实验过程中的各个环节进行分析。结果 N,N-二乙基对苯二胺分光光度法测定水中硫化物，其方法线性、精密度、准确性均满足分析要求，适合应用于清洁水中硫化物的检测。结论实验过程中需注意采样、标准溶液的配制和吸取、显色液的配制等环节，才能有满意的结果。

关键词：饮用水硫化物分光光度法检测注意事项

Clinical value of CT three-dimensional imaging in diagnosing gastrointestinal tract diseases

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World Journal of Gastroenterology 2006年第18期12卷 2945-2948页

作者： Shao-Yin Duan Dan-Tong Zhang qing-chi Lin Yan-Huan Wu Medical Imaging Department Zhongshan Hospital Xiamen University Xiamen 361004 Fujian Province China Gastroenterology and Endocrinology Department Zhongshan Hospital Xiamen University Xiamen 361004 Fujian Province China

AIM： To discuss the clinical value of CT three-dimensional （3-D） imaging in diagnosing gastrointestinal tract diseases.METHODS： Three-D imaging findings of 52 patients were retrospectively analyzed. Three-D imaging methods included shaded surface display （SSD）, volume rendering （VR）, virtual endoscopy （VE） and multiplanar reformatting （MPR）. The diagnosis results of CT 3-D were evaluated by comparison with those of endoscopy and/or surgical finding.RESULTS： Fifty-two patients with gastrointestinal tract diseases were diagnosed by CT 3-D imaging, of whom 50 cases were correctly diagnosed and 2 were misdiagnosed. There were 33 cases of gastric diseases （27 with carcinoma, 5 with peptic ulcer and 1 with leiomyoma） and 19 large intestinal diseases （10 with colon carcinoma, 2 with carcinoma of the rectum, 5 with colon polypus and 2 with tuberculosis of the ileocecal junction）. Twenty-two cases with prominent lesions （9 with subsequent hollow lesions）, 20 with stenosis of cavity （8 with concomitant prominent lesions） and 10 with hollow lesions （5 with concomitant prominent lesions） were shown in 3-D images. The minimal lesion shown was 1.0 cm × 0.8 cm × 0.5 cm.CONCLUSION： CT 3-D imaging, a non-invasive examination without pain, can display clearly and directly the lesions of gastrointestinal tract with accurate location and high diagnosis accuracy. It is an important complementary technique to endoscopy.

关键词： Gastrointestinal tract, disease X-ray computed, Tomograph Image processing Computerassisted

聚羧酸和三萜皂苷对混凝土性能的影响试验研究

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Dynamic Mechanical Behavior and Hypervelocity Impact Performance of an Al-Based Nanocrystalline Alloy

建筑与装饰 2024年第7期 149-151页

作者：凌瑜奇王一薇焦迟晴江苏大学京江学院江苏镇江 212000

随着建筑行业的不断发展,对于混凝土性能有了更高的需求,高性能混凝土能够适应各种需求,在实际施工应用中显现出更优良的性能.高性能外加剂的出现则是为了适应高性能混凝土的发展,比如可以使混凝土产生高减水率、高适应性、高耐久性及... 详细信息

随着建筑行业的不断发展,对于混凝土性能有了更高的需求,高性能混凝土能够适应各种需求,在实际施工应用中显现出更优良的性能.高性能外加剂的出现则是为了适应高性能混凝土的发展,比如可以使混凝土产生高减水率、高适应性、高耐久性及优良施工性的混凝土外加剂.考虑外加剂的掺配方法和掺量影响,本研究是通过引入不同掺量的聚羧酸和三萜皂苷并进行大量实验,进一步探究两者复合产生的影响,得出最优外加剂及最佳掺量.

关键词：聚羧酸三萜皂苷坍落度抗压强度层次分析法控制变量法

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Acta Metallurgica Sinica(English Letters) 2017年第12期30卷 1169-1176页

作者： Shan-Shan Deng Gang Wang Run-qing chi Bao-Jun Pang Dong-Jun Wang Jun Shen School of Materials Science and Engineering Harbin Institute of Technology Harbin China Laboratory for Microstructures Institute of MaterialsShanghai University Shanghai China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin China Key Laboratory of Micro-Systems and Microstructures Manufacturing Ministry of Education Harbin China School of Materials Science and Engineering Tongji University Shanghai China

In a wide strain rate range from 10^-5 to 10^3s^-1, the deformation behavior of an Al-based nanocrystalline alloy was investigated. After fracture, the debris collected was used for statistical analysis, which is expected to reflect the profile of the fracture behavior of the alloy. The energy absorption of alloy at different strain rates was elucidated on account of mass distribution of debris. Based on the parameters obtained by the compression experiment at different strain rates, the numerical simulation experiment was carried out to evaluate the performance of Al-based nanocrystalline alloy as spacecraft shielding. The results suggest that Al-based nanocrystalline alloys have better shield performance than alu- minum alloy under the identical areal density at velocity of 1-7 km/s. The better shield performance is attributed to high fracture strength, high hardness and low toughness of Al-based nanocrystalline alloy as compared with those of aluminum alloy.

关键词： Nanostructure material Sintering Mechanical properties Computer simulation Spacecraft shielding

Mechanism of Excited State Double Proton Transfer in 2-Amino-3-Methoxypyridine and Acetic Acid Complex

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chinese Physics Letters 2018年第9期35卷 87-89页

作者： qing-chi Meng Guang-Hua Ren, Song-Qiu Yang Tian-Shu Chu State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023 Institute for Computational Sciences and Engineering Laboratory of New Fiber Material and Modern the Growing Base for State Key LaboratoryQingdao UniversityQingdao 266071 University of the chinese Academy of Sciences Beijing 100049 Textile

The excited-state double-proton transfer （ESDPT） mechanism of 2-amino-3-methoxypyridine and acetic acid com- plex is studied by the density functional theory （DFT） and time-dependent DFT with CAM-B3LYP functional. The complex is connected through two different types of inter-molecular hydrogen bonds. After photo-excitation, both hydrogen bonds get strengthened, which can facilitate the ESDPT reaction. The scanned potential energy curve along the proton transfer coordinate indicates that the ESDPT reaction proceeds in a stepwise pattern.

关键词： LYP CAM PT MOP Mechanism of Excited State Double Proton Transfer in 2-Amino-3-Methoxypyridine and Acetic Acid Complex

A Phase Ⅱ Study of Fotemustine Plus Dacarbazine with Dendritic Cell Vaccines as First-Line Therapy for chinese Patients with Advanced Acral Lentiginous Melanoma

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chinese Journal of Cancer Research 2009年第1期21卷 13-19页

作者： Lu Si Zhi-hong chi Xiang-qing Yuan Chuan-liang Cui Xi-nan Sheng Jun Guo Key Laboratory of Carcinogenesis and Translational Research （Ministry of Education） Renal Cancer and Melanoma Center Peking University School of Oncology Beijing Cancer Hospital ＆ Institute Beijing 100142 China

Objective： To investigate fotemustine plus dacarbazine （DTIC） with dendritic cell （DC） vaccines on patients with advanced acral lentiginous melanoma （ALM）. Fotemustine is a cytotoxic alkylating agent with a remarkable antitumor activity as single agent but also in association with （DTIC）. DC is the strongest antigen presenting cell which could induce durable clinical responses. Methods： This was a single-center study. Between July 2003 and June 2006, twenty-eight chemotherapy-naive patients of advanced ALM received fotemustine 100 mg/m^2, dr, 12, DTIC 400 mg/d d2-6, DC vaccines subcutaneously dT, 9, 13 repeated every 28 days. Ten HLA-A02＋24＋ patients received vaccines pulsed with melanoma antigen derived peptides, melanoma antigen recognized by T-cells 1 （Mart-i） and S-100. Eighteen patients received DC loaded with allogeneic melanoma lysate. The primary end-point was progression free survival （PFS）. Secondary end-points were overall survival （OS）, overall response rate （ORR） and toxicity. Tumor assessment was performed every 8 weeks and evaluated according to response evaluation criteria in solid tumors （RECIST）. Results： The 15 men and 13 women had a median age of 51 years. 16 patients had stage Mlc disease and 11/16 had liver metastasis. Patients received an average of 3.82±1.25 cycles. Follow-up for the 18 surviving patients ranged from 7-41 months with a median of 12 months. Median PFS was 8.5 months （95% CI： 7.86-15.21） with 12 patients remaining progression free. Only 10 patients died. Median OS was 12 months （95% CI： 10.33-18.24）. ORR （CR＋PR） was 35.7% including 3 complete response （CR） and 7 partial response （PR）. Six patients had disease stable. A total of 19 Grade Ⅲ/Ⅳ toxicities were observed including thrombocytopenia （n=8）, neutropenia （n=5）, fatigue （n=6） and hypersensitivity reaction （n=1）. One patient died of Grade IV thrombocytopenia. Conclusion： Fotemustine and dacarbazine plus DC vaccines are safe and tolerable to chinese ALM patients. The regi

关键词： Fotemustine Dacarbazine Dendritic cell Melanoma