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Effects of seed aerosols on the growth of secondary organic aerosols from the photooxidation of toluene

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Journal of Environmental Sciences 2007年第6期19卷 704-708页

作者： HAO li-qing WANG Zhen-ya HUANG ming-qiang FANG li ZHANG Wei-jun Laboratory of Environmental Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

Hydroxyl radical （.OH）-initiated photooxidation reaction of toluene was carried out in a self-made smog chamber. Four individual seed aerosols such as ammonium sulfate, ammonium nitrate, sodium silicate and calcium chloride, were introduced into the chamber to assess their influence on the growth of secondary organic aerosols （SOA）. It was found that the low concentration of seed aerosols might lead to high concentration of SOA particles. Seed aerosols would promote rates of SOA formation at the start of the reaction and inhibit its formation rate with prolonging the reaction time. In the case of ca. 9000 pt/cm^3 seed aerosol load, the addition of sodium silicate induced a same effect on the SOA formation as ammonium nitrate. The influence of the four individual seed aerosols on the generation of SOA decreased in the order of calcium chloride〉sodium silicate and ammonium nitrate〉ammonium sulfate.

关键词： toluene photooxidation secondary organic aerosol seed aerosol

Efficient Side-chain Modification of Dextran via Base-catalyzed Epoxide Ring-opening and Thiol-ene Click Chemistry in Aqueous Media

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Chinese Journal of Polymer Science 2014年第8期32卷 969-969,970-974页

作者： ming-qiang li Zhao-hui Tang Chao Wang Yu Zhang Hai-tao Cui 陈学思 Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences School of Science Changchun institute of technology

In this study, a novel approach by combining base-catalyzed epoxide ring-opening and thiol-ene click chemistry is presented for the side-chain modification of dextran. The vinyl-modified dextran is prepared by a basic epoxide ring opening reaction of allyl glycidyl ether in 0.1 mol/L NaOH, followed by thiol-addition click reaction of three model sulfhydryl compounds using water-soluble Irgacure 2959 as the photoinitiator, leading to side-chain functionalized dextran modified with carboxyl, bidentate dicarboxyl or amino groups. This is the first example of combining epoxide ring-opening and thiol- ene click chemistry for side-chain modification of dextran in aqueous media. Importantly, it may also be extended as a convenient and efficient method for the side-chain modification of other polysaccharides.

关键词： Functionalization Thiol-ene click chemistry Dextran Sulphur compounds Green chemistry.

Chronic hepatitis virus infection increases the risk of pancreatic cancer: a meta-analysis

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Hepatobiliary & Pancreatic Diseases International 2013年第6期12卷 575-583页

作者： Shuai Xing Zhi-Wei li Yuan-Feng Tian li-Min Zhang ming-qiang li Ping Zhou Institute of Organ Transplantation Tongji Hospital Tongji Medical CollegeHuazhong University of Science and Technology Key Laboratory of Organ Transplantation Ministry of Health and KeyLaboratory of Organ TransplantationMinistry of Education Department of Radiology Tongji Hospital Tongji Medical CollegeHuazhong University of Science and Technology Department of Urology Tongji Hospital Tongji Medical CollegeHuazhong University of Science and Technology

BACKGROUND:Several reports have inconsistently demonstrated that there is an association between hepatitis B virus(HBV)or hepatitis C virus(HCV)infections and pancreatic cancer(PC).The aim of the present meta-analysis is to assess this possible *** SOURCES:Studies were identified by searching available database from January 2000 to July *** associations between PC risk and hepatitis B surface antigen(HBsAg)and its antibody(HBsAb),hepatitis B e antigen(HBeAg)and its antibody(HBeAb),anti-HBcAg antibody(HBcAb),and HCV antibody(anti-HCV)were ***:Eight case-control and two cohort studies were included,and their quality scores were assessed by the modified Newcastle-Ottawa Quality Assessment Scale(NOS).We found that HBsAg and anti-HCV seropositivity significantly increased risk of PC(OR=1.28,95%CI:1.11-1.48 and OR=1.21,95%CI:1.02-1.44).The presence of HBsAb was associated with a statistically significant decrease in the risk of PC(OR=0.40,95%CI:0.20-0.79)and HBeAb(OR=0.62,95%CI:0.39-0.99).HBsAg–/HBcAb+/HBsAb–or HBsAg–/HBcAb+/HBsAb+profile was not related to PC risk(OR=1.57,95%CI:0.83-2.98 and OR=1.24,95%CI:0.72-2.14).CONCLUSIONS:HBV/HCV infection increases the risk of *** and HBeAb seropositivity may be the protective factors against *** is still uncertain whether serological pattern of past exposure to HBV with or without natural immunity is associated with an enhanced probability of this malignancy.

关键词： hepatitis B virus hepatitis C virus HBV status pancreatic cancer meta-analysis

Effect of Mg and Fe Doping on Optical Absorption of liNbO3 Crystal through First Principles Calculations

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Chinese Physics Letters 2014年第3期31卷 125-128页

作者： HUANG Duo-Hui YANG Jun-Sheng CAO Qi-Long WAN ming-Jie li qiang SUN liang WANd Fan- Hou Computational Physics Key Laboratory of Sichuan Province Yibin University Yibin 644007

Using first principles calculations, we investigate the structural, optical, and electronic properties of liNbO3 （LN） and M doped LN （M=Mg, Fe）. The density of states are calculated to analyze the effect of doping Mg and Fe ions on the absorption spectra and electronic properties of LN. The results show an ultraviolet shift in the optical absorption edge of Mg-doped LN compared with that of intrinsic LN. On the contrary, the absorption edge of Fe-doped LN crystal reveals a red shift. The optical absorption spectra show an improved optical response in the visible range for Mg-doped LN, which significantly differs from that obtained for Fe-doped LN. The electronic excitations from the valence band to the conduction band of LN leads to an improved optical absorption response in the visible region as observed experimentally. The obvious changes of the doped LN crystal are found in some cases, which provide a helpful guide for preparing doped LN crystal.

关键词： liTHIUM niobate -- Optical properties RESEARCH SEMICONDUCTOR doping liGHT absorption MAGNESIUM PHYSICS research

Deep learning compact binary codes for fingerprint indexing

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Frontiers of Information Technology & Electronic Engineering 2018年第9期19卷 1112-1123页

作者： Chao-chao BAI Wei-qiang WANG Tong ZHAO Ru-xin WANG ming-qiang li School of Computer and Control University of Chinese Academy of Science School of Mathematical Sciences University of Chinese Academy of Science Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of Science

With the rapid growth in fingerprint databases, it has become necessary to develop excellent fingerprint indexing to achieve efficiency and accuracy. Fingerprint indexing has been widely studied with real-valued features,but few studies focus on binary feature representation, which is more suitable to identify fingerprints efficiently in large-scale fingerprint databases. In this study, we propose a deep compact binary minutia cylinder code（DCBMCC）as an effective and discriminative feature representation for fingerprint indexing. Specifically, the minutia cylinder code（MCC）, as the state-of-the-art fingerprint representation, is analyzed and its shortcomings are ***, we propose a novel fingerprint indexing method based on deep neural networks to learn *** novel network restricts the penultimate layer to directly output binary codes. Moreover, we incorporate independence, balance, quantization-loss-minimum, and similarity-preservation properties in this learning ***, a multi-index hashing（MIH） based fingerprint indexing scheme further speeds up the exact search in the Hamming space by building multiple hash tables on binary code substrings. Furthermore, numerous experiments on public databases show that the proposed approach is an outstanding fingerprint indexing method since it has an extremely small error rate with a very low penetration rate.

关键词： Fingerprint indexing Minutia cylinder code Deep neural network Multi-index hashing

Delayed cerebral lipiodol embolism after transcatheter arterial chemoembolization of hepatocellular carcinoma

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Chinese Medical Journal 2009年第7期122卷 878-880页

作者： WU Jian-jun CHAO ming ZHANG Guang-qiang li Bin Department of Radiology the Second Hospital School ofMedicine Zhejiang University Hangzhou Zhejiang 310009China

Transcatheter arterial chemoembolization （TACE） has been an effective mean in treating hepatocellular carcinoma for nearly 30 years. The reported complications associated with TACE mainly include acute hepatic failure （accounting for 0.26%）, liver abscess （0.22%）, multiple intrahepatic aneurysms （0.17%）, hepatic artery occlusion （1.52%）, spontaneous rupture of tumor （0.15%）, gallbladder infarction （0.3%）, perforation of duodenum （0.05%）, acute renal failure （0.05%）,

关键词： carcinoma, hepatocellular intracranial embolism iodized oil chemoembolization, therapeutic

Growth activity of epidermal cells from different parts of human body

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Chinese Medical Journal 2007年第16期120卷 1444-1447页

作者： CHAI Jia-ke SHENG Zhi-yong MA Zhong-feng YANG Hong-ming liU qiang liang li-ming Burns Institute First Hospital Affiliated to General Hospital of PLA Beijing 100037 China

Background Most epidermal cells used in skin tissue engineering are obtained from the skins of fetuses or prepuces, which can not be widely used in culturing and transplanting autologous epidermis for patients with extensive burn wounds. To solve the problem, in this study, we cultured epidermal cells from different parts of human body in vitro, and detected their growth activity. Methods Normal epidermal cells obtained from the prepuce, scalp, and axilla of male patients, were cultured and passaged. Their growth characteristics including adherent rate and growth activity were compared. Data were analyzed by homogeneity test of variance. Results In primary culture, the growth of epidermal cells from the prepuce was significantly faster than that of the epidermal cells from the scalp and axilla. In the cells obtained from the prepuce, 80% confluence was achieved on day 12, while on day 16 and day 20 in the cells from the scalp and axilla, respectively. However, no significant difference was detected in their growth and proliferation in the second passage. Conclusions Although the growth of epidermal cells obtained from the scalp and axilla is slower than that from the prepuce in primary culture, stable cell line can be established and used in preparation of auto-epidermal grafts for patients with extensive bum wounds. Therefore, the scalp and axillary skin should be considered as important sources of epidermal cells other than the prepuce.

关键词： epidermis cell growth

Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 102-110页

作者： qiang liu Xiang li Shen Du ming Gao Yanbin Yin Jiongming Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

During the continuous casting process of high-Mn high-Al steels,various types of gases such as Ar need to escape through the top of the *** which,the behavior of bubbles traversing the liquid slag serves as a restrictive link,closely associated with viscosity and the thickness of liquid *** contrast to two-dimensional surface observation,three-dimensional(3D)analysis method can offer a more intuitive,accurate,and comprehensive ***,this study employs a 3D X-ray microscope(3D-XRM)to obtained spatial distribution and 3D morphological characteristics of residual bubbles in mold flux under different basicity of liquid slag,different temperatures,and different holding *** results indicate that as basicity of slag increases from 0.52 to 1.03,temperature increases from 1423 to 1573 K,the viscosity of slag decreases,the floating rate of bubbles *** addition,when holding time increases from 10 to 30 s,the bubbles floating distance increases,and the volume fraction and average equivalent sphere diameter of the bubbles solidified in the mold flux gradually *** one word,increasing the basicity,temperature,and holding time leading to an increase in the removal rate of bubbles especially for the *** findings of bubbles escape behavior provide valuable insights into optimizing low basicity mold flux for high-Mn high-Al steels.

关键词： mold flux low basicity bubbles three-dimensional X-ray microscope viscosity

Phase II metabolites of etofesalamide in filamentous fungi

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Acta Pharmacologica Sinica 2005年第7期26卷 893-896页

作者： Hai-hua HUANG Gui-lei MA Yu-ming SUN~2 qiang li~2 Da-fang ZHONG~(2,3) Department of Pharmaceutical Microbiology 2 Laboratory of Drug Metabolism and Pharmacokinetics,Shenyang Pharmaceutical University,Shenyang 110016,China Department of Pharmaceutical Microbiology Shenyang Pharmaceutical University Shenyang 110016 China

Aim:To study phase Ⅱ metabolites of etofesalamide in filamentous ***:Seven fungi were screened to transform *** metabolites ofetofesalamide were assayed using liquid chromatography coupled to *** major metabolite was subject to enzymatic hydrolysis to con-firm its ***:Etofesalamide was converted into two phase Ⅱmetabolites:glucoside and riboside *** conjugate was themajor product with a yield greater than 90%;no phase I metabolites were ***:Glucoside and riboside conjugations of etofesalamide in filamentousfungi differ from the phase Ⅱ metabolism of glucuronidation in mammals.

关键词： etofesalamide Cunninghamella metabolite transformation: mass spectrum analysis