Synthesis,microstructure, and magnetic properties of monosized Mn x Zn y Fe3 ? x ? y O4 ferrite nanocrystals

We report the synthesis and characterization of ferrite nanocrystals which exhibit high crystallinity and narrow size distributions. The three types of samples including Zn ferrite, Mn ferrite, and Mn-Zn ferrite were prepared via a non-aqueous nanoemulsion method. The structural, chemical, and magnetic properties of the nanocrystals are analyzed by transmission electron microscopy, X-ray diffraction, X-ray fluorescence, and physical property measurement system. The characterization indicates that the three types of ferrite nanocrystals were successfully produced, which show well-behaved magnetic properties, ferrimagnetism at 5 K and superparamagnetism at 300 K, respectively. In addition, the magnetization value of the ferrites increases with the increasing concentration of Mn.     

7β,10β-二甲氧基-10-DABⅢ的合成路线综述

卡巴他赛由FDA审核批准上市,临床上用于治疗激素难治性转移性前列腺癌。从结构上看,卡巴他赛是多西他赛7、10-OH甲醚化的衍生物,所以对7、10-OH进行选择性的甲醚化是卡巴他赛合成的关键技术点。7β,10β-二甲氧基-10-DABⅢ是卡巴他赛合成的关键中间体,本文对此中间体的合成路线进行综述,以期清晰地展示其合成研究现状,为卡巴他赛的合成研究及工业生产提供参考和借鉴。     

中国大陆生物质燃烧排放的TSP,PM10,PM2.5清单

根据2000年各省市生物质的消耗资料,结合查阅的排放因子,计算了中国大陆生物质燃烧所排放的TSP,PM10,PM2.5的总量及各省市的排放清单,并进一步细化到县、区级行政区.研究表明,生物质燃烧排放的颗粒物在地区间的分布极不均衡,排放量较大的包括华东、中南地区的各省市;各种生物质燃烧对颗粒物的排放量的贡献差异很大,其中秸秆和薪材是最主要来源;单位面积生物质燃烧排放颗粒物较高的地区由东北至中南围绕中国的主要农业产地呈带状分布.     

40年,10个《腐植酸》杂志特别期刊

正2019年,是《腐植酸》杂志创刊40周年,截止目前,《腐植酸》杂志总期数已有191期(不包括2期增刊),每一期都是《腐植酸》编辑部的"孩子",每一期都特别珍贵。她作为行业会刊,记载了腐植酸行业发展的路程、记录了《腐植酸》杂志发展的历程,同时结合特殊事件编发特别期刊,以展现特定绿色风貌。现就40年中编发的10个特别期刊,按倒计时顺序分享给大家。1. 2019年第5期(总第190期):设有"献给共和国70周年特辑"专题的特别期刊。201     

X-ray absorption spectroscopy of Ti-containing molecular sieves ETS-10, aluminum-free Ti-β, and TS-1

We report here the first structural characterization by Ti K-edge EXAFS and XANES of ETS-10 and aluminum-free Ti- molecular sieves. A TS-1 sample was also studied for comparison. The near-edge spectrum of TS-1 revealed an intense pre-edge feature characteristic of Ti atoms in tetrahedral coordination. However, the pre-edge peak for ETS-10 was quite small and shifted in energy, which is consistent with the known octahedral structure surrounding Ti atoms in the material. Analysis of the EXAFS for ETS-10 revealed an average Ti-O interatomic distance of 2.00 +- 0.01 Å which is longer than the Ti-O distance (1.95Å) in anatase TiO₂. For Ti-, an intense pre-edge peak is present in the near-edge spectrum and the intensity, energy and width of this peak are the same as for TS-1. In addition, the average Ti-O interatomic distance in Ti- and TS-1 was 1.80 +- 0.01 Å, which is significantly shorter than the distance measured in ETS-10. The EXAFS and XANES results indicate that the Ti sites in aluminum-free Ti- are structurally identical to the tetrahedral sites in TS-1. This conclusion is supported by the similarity of the UV absorption thresholds for the two samples. X-ray absorption spectra were also recorded with methanol or 2-propanol adsorbed on the Ti- and TS-1 molecular sieves. Alcohol adsorption decreased the intensity and broadened the Ti pre-edge peak for both samples, demonstrating a local chemical interaction with the Ti sites. Methanol adsorption lengthened the average Ti-O bond to 1.83 ± 0.01 Å. The similarity of the X-ray absorption spectra for aluminum-free Ti- and TS-1 in the presence of alcohols suggests that the Ti sites in the two frameworks are chemically indistinguishable for vapor-phase adsorption of alcohols at low concentrations.     

10%恶唑禾草灵防除麦田麦娘,野燕麦效果

试验表明亩用１０％恶唑禾草灵３０－４０毫升，分别于小麦分蘖期，小麦返青期施药对看麦娘株防铲９３．１－９６．１％，鲜重防效９０．１－９６．５％；对野燕麦株防效９１．３－９６．７％，除草效果优于甲磺隆，燕麦枯，是防除野燕麦、看麦娘的特效除草剂，并且从小麦分蘖期到返青期均可使用，对小麦安全。     

完善注采井网,提高河10断块开发水平

河10断块为一常温常压、中孔、高渗透、稀油构造-岩性油气藏。该区块1988年投入开发,经历20多年的滚动开发,目前井网存在注采不完善、注采对应率低、水驱控制程度低等问题,针对这些问题,我们通过深化单元目标化管理;分区域、分砂体注采完善,提高注采对应率及水井分注率;根据注水见效情况及时注采调配等有效治理手段使得断块注水效果得到明显改善,产量递减趋势明显得到缓解。与治理前对比,区块日油水平提高11t/d,动液面上升了160.3米,自然递减下降了7.04%。     

Sintering behavior and mechanical properties of WC–10Co,WC–10Ni and WC–10Fe hard materials produced by high-frequency induction heated sintering

The comparison of sintering behavior and mechanical properties of WC–10 wt.%Co, WC–10 wt.%Ni and WC–10 wt.%Fe hard materials produced by high-frequency induction heated sintering (HFIHS) method was accomplished using ultra-fine powder of WC and binders (Co, Ni, Fe). The advantage of this process allows very quick densification to near theoretical density and prohibition of grain growth in nano-structured materials. Highly dense WC–10Co, WC–10Ni and WC–10Fe with a relative density of up to 99% could be obtained with simultaneous application of 60 MPa pressure and induced current within 1 min without significant change in grain size. The hardness and fracture toughness of the dense WC–10Co, WC–10Ni and WC–10Fe composites produced by HFIHS were investigated.     

阿克苏诺贝尔能源利用转型升级,碳排放每年减少10万吨

<正>荷兰经济事务部部长汉克·坎普(Henk Kamp)、能源公司Eneco、港务机构Groningen Seaports近日共同见证了一座新型能源设施的启动,该设施将生物材料转化的蒸汽能源提供给位于荷兰北部Delfzijl港的化工区。阿克苏诺贝尔功能性化学品生产基地便设在此处。目前,生物材料的能源转化率得到明显提高,而阿克苏诺贝尔在当地的能源消耗有10%来源于这种再生性能源,由此每年可减少CO2排放10万吨。经济部长汉克·坎普表示,"荷兰北部地区在再生性能源开发利用方面比较突出,并首先计划实行荷兰能源协议,而位于     

千锤百炼,传奇诞生 思锐N1204＋K10X云台

在众多的三脚架品牌中,挑选产品时,你最注重的是什么？稳定性？性价比高？承重能力强？还是其他的方面呢？思锐N1204三脚架集这些优点于一身,拥有卓越的表现。     

墨西哥塑料业未受到应用重视,增幅仍达10%

墨西哥城(2012年1月31日)消息,墨西哥塑料业在2011年实现10%的行业增长,行业销售额超200亿美元,这一数字包括加工产品、树脂和生产设备。据墨西哥塑料工业协会(Anipac)     

剑指“西北轮胎王”,橡胶企业提出10年规划

正2020年7月初,陕西延长石油西北橡胶有限责任公司,发布未来发展规划。发展战略目标未来10年,收入达到60亿元规模,产品达到国内一流,企业管理科学先进,职工生活富裕,实现生产智能化、经营国际化、发展创新化、资产证券化,建成务实创新高效令人尊敬的具有较强国际竞争力的橡胶产业企业。