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Strong enhancement on dye photocatalytic degradation by ball-milled TiO2:A study of cationic and anionic dyes

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Journal of Materials Science & Technology 2017年第8期33卷 856-863页

作者： Z.Jia l.B.T.la W.C.Zhang S.X.liang B.Jiang S.K.Xie D.Habibi l.C.Zhang School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia Environmental Protection Administration of fi'an Cith Ji'an 343000China School of Mechanical and Chemical Engineering The University of Western AustraliaPerchWA 6009Australia School of Materials Science and Engineering University of Science and TechnologyBeijing 100083China School of Mechanical&Electrical Engineering finggangshan Universityfl'an 343000China

TiO2 particles with desirable properties were produced by undergoing specific durations of ball *** of the TiO2 particles before and after ball milling were investigated via X-ray diffraction（XRD）, Brunauer-Emmett-Teller（BET）, particle size analysis, zeta potential, and scanning electron microscope（SEM）. The equilibrium adsorption data were well fitted to langmuir, Freundlich, and Dubinin-Radushkevich（D-R） isotherms. Compared to the as-received TiO2（mean particle size d150= 0.78μm, specific surface area = 88.17 m^2g-1, pore volume = 0.41 cm^3g-1）, the 60 min ballmilled TiO2（d50= 0.55 μm, specific surface area = 99.48 m2g-1, pore volume = 0.48 cm3g-1） enhanced the adsorption quantity of congo red and methylene blue from 10.4 mg g-1to 13.6 mg g-1, and from17.0 mg g-1to 22.2 mg g-1, respectively; and also improved the kinetic rates from k = 0.1325 to 0.2193, and k = 0.0944 to 0.1553, respectively. Dye adsorption and degradation efficiency of congo red was enhanced in acidic p H range（2–5.14）, and methylene blue was enhanced in alkaline p H range（7.58–12）.

关键词： Ball-milled TiO2 Congo red Methylene blue Equilibrium adsorption Photocatalysis

Reaction behaviors of Pb and Zn sulfates during reduction roasting of Zn leaching residue and flotation of artificial sulfide minerals

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 358-366页

作者： Yong-xing Zheng Jilai Ning Wei liu Pan-jin Hu Jin-fang lü Jie Pang State Key laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Faculty of land Resource Engineering Kunming University of Science and TechnologyKunming 650093China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

To evaluate the feasibility of recovering Pb and Zn sulfides and Ag-containing minerals from Zn leaching residue by the process of reduction roasting followed by flotation,the reaction behaviors of Pb and Zn sulfates during this process were *** analysis showed that the transformation ratios of PbSO4 and ZnSO4 could reach 65.51%and 52.12%,respectively,after reduction roasting,and the introduction of a sulfidation agent could improve the transformation ratios of these *** electron microscopy-energy dispersive spectroscopy(SEM-EDS)revealed that temperature obviously affects the particle size,crystal growth,and morphology of the artificial Pb and Zn sulfide *** size analysis demonstrated that the particle size of the materials increases after *** tests revealed that a flotation concentrate composed of 12.01wt%Pb,27.78wt%Zn,and 6.975×10^(−2)wt%Ag with recoveries of 60.54%,29.24%,and 57.64%,respectively,could be obtained after roasting.

关键词： zinc leaching residue reduction roasting flotation Pb and Zn sulfates artificial sulfides

Accident of large-scale Wind Turbines Disconnecting from Power Grid and Its Protection

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电力系统自动化 2012年第8期36卷 105-109页

作者： Dong, X.Z. Shi, S.X. Wang, B. Bak, D.J. Cao, R.B. Ren, l. lan, l. He, S.E. State Key lab. of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China Wind Power Technology Center Gansu Electric Power Corporation Lanzhou 730050 China

There were many accidents of large-scale wind turbines disconnecting from power grid in *** singlephase-to-ground fault cannot be correctly detected,single-phase-to-ground fault evolved to phase-to-phase ***-to-phase fault was isolated slowly,thus leading to low *** wind turbines without enough low voltage ride-through capacity had to be disconnected from the *** some wind turbines being disconnected from the grid,overvoltage caused by reactive power surplus made more wind turbines disconnect from the *** on the accident analysis,this paper presents solutions to above problems,including travelling waves based single-phase-to-ground protection,adaptive low voltage protection,integrated protection and control,and high impedance fault *** solutions lay foundations in theory and technology to prevent large-scale wind turbines disconnecting from the operating power grid.

关键词：大型风力发电机组低电压保护电网事故断开单相接地故障风力涡轮机故障检测切断电源

MenB-4C疫苗诱导的IgG杀菌抗体可识别淋球菌脂寡糖聚糖表位

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微生物学免疫学进展 2024年第05期 25-25页

作者：吴瑞 TZENG Y l

B群脑膜炎球菌疫苗MenB-4C（Bexsero?）中的细菌外膜囊泡（OMVs）可预防淋球菌感染，但具体免疫保护机制目前还不清楚。脑膜炎球菌OMV疫苗能在人体中产生靶向脑膜炎球菌和淋球菌低脂寡糖（lOS/内毒素）的抗体，但这些lOS抗体的结构特异...

B群脑膜炎球菌疫苗MenB-4C（Bexsero?）中的细菌外膜囊泡（OMVs）可预防淋球菌感染，但具体免疫保护机制目前还不清楚。脑膜炎球菌OMV疫苗能在人体中产生靶向脑膜炎球菌和淋球菌低脂寡糖（lOS/内毒素）的抗体，但这些lOS抗体的结构特异性也还不明确。采用Western blot方法检测MenB-4C免疫前后的10份配对人血清，用于鉴定脑膜炎球菌和淋球菌中的lOS。

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Development of high-precision DC power supply prototype for HEPS-TF

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Radiation Detection Technology and Methods 2019年第2期3卷 1-7页

作者： X.l.Guo F.l.long B.Chen P.liu University of Chinese Academy of Sciences Beijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Neutron Science Center Dongguan 523803China

Purpose This power supply prototype is developed for the quadrupole magnets in the storage ring of *** project requires a high current stability of these power supplies,in order to master the key technology of this type of power supply in advance,a prototype is made in the project of HEPS test *** Modularization is used in the prototype’s topology and a combination of digital and analog control is adopted in the closed-loop *** control loops are used to improve the output current’s *** order to improve the current stability,the key devices in the circuit are under thermostatical *** The acceptance test results for the NDRC are given in details,which show that all the parameters are better than the design *** After a lot of experiments and tests,all the parameters of this prototype passed the acceptance *** the results,the stability of this prototype achieved 5.2 ppm,the repeatability is 3.2 ppm,and the low-frequency voltage ripples are lower than the requirements of *** success of this prototype means that the requirements of power supplies in physical design can be met.

关键词： Stability High-precision DC power supply Repeatability Voltage ripple

Community Participation in Forest Resource Management in Nepal

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Journal of Mountain Science 2005年第1期2卷 32-41页

作者： Keshav l.Maharjan Graduate School for International Development and Cooperation Hiroshima UniversityHigashi-Hiroshima Hiroshima739-8529Japan

livelihood of the people in Nepal hills depends much upon forest resources in addition to farming as forest plays a critical role in the well being of the farming households where access to alternative sources, such as energy for cooking, nutrition for animals, materials for fertilizer and constructing materials for shelter, are limited. Thus, the well being of the people in the hills is directly affected by the management of these forest resources. This issue was addressed in this paper by examining the forest resource management practices and its effect on well being of rural people in two different stages in a village lying in the steep hill of Mahabharat Range in the southern hills of Kathmandu valley, lalitpur District. The main ethnic/caste groups in the village are Brahmin/Chhetri (high Hindu caste), Magar/Tamang (Tibeto Burmans) and Kami (occupational caste: cobbler). Currently there are four community forest users groups, with mixed ethnic membership, organized to manage the forest resources. The endowments, weak institutional settings, before 1990 helped the Bhramins, Magars and Tamangs to get access into the private forest endowment, which made them easy to get access to the forest resources, mainly fuel wood, fodder and timber in 1990 and enhanced their well beings. But the socially backward Kami could not get benefit from the institutions that existed during that time and had less chance to enhance their well beings. After the set up of different endowments during late 1990s, i.e., hand over of forest management to usersgroupsin line with the concept of community forest, environment to use the forest resources became better for all the groups, along with the management of the forest. This enhanced the well beings of all the groups in the study village. However, the ability of Kami to use the forest resources to enhance their well beings was still lacking behind. The reason was partially due to the difference in endowments carried over from the endowment

关键词： Nepal hills forestresourcemanagement endowment community forest users group caste/ethnicity well being

冀东迁安地区BIF型铁矿地质特征及成因探讨

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地质与勘探 2024年第5期60卷 900-918页

作者：许曼吕水韦文国邢运涛刘海龙杨爱雪李彪安梦莹河北省地质矿产勘查开发局第五地质大队(河北省海洋地质环境调查中心) 河北唐山063000

冀东迁安地区是我国重要的BIF型铁矿集区之一。随着铁矿床开发利用程度的提高,浅部铁矿资源开发殆尽。近年来,多家地勘单位在迁安地区大中型铁矿床深部及外围进行找矿工作,在深部新发现了厚大矿体,取得了找矿突破。虽然勘查取得一定的成... 详细信息

冀东迁安地区是我国重要的BIF型铁矿集区之一。随着铁矿床开发利用程度的提高,浅部铁矿资源开发殆尽。近年来,多家地勘单位在迁安地区大中型铁矿床深部及外围进行找矿工作,在深部新发现了厚大矿体,取得了找矿突破。虽然勘查取得一定的成果,但相关的铁矿床分布规律及成矿模式未进行过系统的研究,对迁安地区成矿带缺少整体认识。本文系统分析了迁安地区沉积变质型铁矿的成矿地质条件,总结了赋矿地层特征。进行了迁安地区铁矿褶皱构造五级划分,确定三级倒转向斜构造为主要控矿构造。初步厘定了断裂构造为成矿期后的脆性断裂,多对矿体产生破坏和错断;明确了迁安地区铁矿分布在迁安隆起向南西突出的“C”字形边缘弧形褶皱带中,形态受倒转向斜控制。针对迁安部分矿区发现的第二层铁矿体,进行了深、浅部矿体地质特征对比分析,认为海底热液喷气活动具有周期性,原始沉积时形成了多层铁矿层,并经受成矿期后断裂构造改造,形成北高南低的阶梯状地堑赋矿模式。依据多年的勘探成果结合本次研究工作,建立了迁安地区成矿模式,为下一步找矿工作提供了理论支撑。

关键词： BIF铁矿矿床分布规律构造作用成矿模式迁安地区冀东

Robust color purity of reddish-orange emission from Sm^(3+)-activated la10W22O81 biocompatible microphosphors for solid state lighting and anticancer applications

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Journal of Rare Earths 2023年第12期41卷 1850-1859,I0001页

作者： K.Naveen Kumar l.Vijayalakshmi Gayeon lee Gumin Kang Jiseok lim Jungwook Choi School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeongbuk38541Republic of Korea Department of Automotive Engineering Yeungnam UniversityGyeongsanGyeongbuk38541Republic of Korea School of Mechanical Engineering Chung-Ang UniversitySeoul06974Republic of Korea Nanophotonics Research Center Korea Institute of Science and TechnologySeoul2792Republic of Kora

We synthesized reddish-orange luminescent la_(10)W_(22)O_(81)(lWO):Sm^(3+)microphosphors by hydrothermalassisted solid-state reaction.X-ray diffraction analysis reveals that all the studied phosphors crystallize in an orthorhombic structure in the Pbcn space group(60),Field emission scanning electron microscopy indicates that the lWO:1.5 mol% Sm^(3+)phosphor displays a smooth-surfaced hexagonal rod-like shape,with a closed shape at both ends,and high-resolution transmission electron microscopy demonstrates a robust crystalline *** chemical composition and valence states of the phosphor were investigated using X-ray photoelectron *** 403 nm excitation,lWO:1.5 mol% Sm3+exhibits maximum intensity with the strongest band at 596 nm(^(4)G_(5/2)→^(6)H_(7/2)) in the reddish-orange *** intensity of Sm^(3+) emission decreases beyond 1.5 mol% owing to concentration quenching regulated by dipole-quadrupole interaction between Sm^(3+)*** optimized microphosphor lWO:1.5 mol% Sm^(3+)exhibits color coordinates(0.5760,0.4207),which is close to that of the Amber lED-NSPAR 70 BS(0.570,0.420),displaying the highest color purity of 99.2% and correlated color temperature of 1694 *** addition,both breast cancer cells MCF-7 and normal lung fibroblasts WI-38 were tested for toxicity with the optimized *** is found that the lWO:1.5 Sm^(3+)microphosphor is extremely toxic to cancer cells,but not to normal *** on these results,lWO:Sm^(3+)microphosphor can serve as a biomedical candidate for the treatment of cancer,as well as a potential multicolor emitting material for w-lEDs.

关键词： Sm^(3+):la_(10)W_(22)O_(81) Reddish-orangeemission Color purity Photonic applications Anticancer Rareearths

High Strain-Rate and Shock Response of Carbon SupercompositeTM

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