| 1 | Paleomagnetic results of Late Paleozoic rocks from northern Qiangtang Block in Qinghai-Tibet Plateau, China显示文摘Tectonic evolution of the Tethys and the boundary between the Gondwanaland and the Eurasia during the Carboniferous and Permian remain hotly debated. Qiangtang region in the Qinghai-Tibet Plateau may be a key place to study these problems. A paleomagnetic study was conducted on the Late Paleozoic rocks in the northern Qiangtang region (33.7°N, 86.7°W), Tibet. Two sites (21 samples) in the Upper Carboniferous, eleven sites (101 samples) in the Permian, and two sites (16 samples) in the Lower Triassic were investigated. The rock magnetic data revealed hematite and magnetite as the main magnetic carriers. In stepwise thermal demagnetization and/or combined alternating field (AC) demagnetization, two characteristic components in the majority of the samples were identified as (1) the Low-temperature Component (LTC), characterized by northerly decli- nation and moderate to steep inclination, corresponding to a pole position overlay with the present North Pole. A minority of the samples present single component, and their directions are the same as (2) the High-temperature Component (HTC) of double components. The combined single-component and HTC data of the Permian can pass the R-test at 95% level and the F-test at 99% level, as well as the BC-test. The pole position from the Late Carboniferous is at 31.8°S, 45.7°E with dp=2.1, dm=3.9, that from the Early and Middle (Late) Permian is at 31.7°S, 46.8°E with dp=9.2, dm=16.9 (34.4°N, 54.1°E with dp=6.9, dm=12.5) respectively, and that from the Early Triassic is at 16.9°S, 22.5°E with dp=4.9, dm=9.2. These pole positions are different from the other poles for the Qiangtang Block, which suggests the single-component and HTC directions are probably a primary magnetization and the northern Qiangtang Block was paleogeographically situated at low latitudes in the Northern Hemisphere in the Late Paleozoic. | CHENG Xin WU HanNing GUO Qiang HOU BaoNing XIA LingYan WANG HaiJun DIAO ZongBao HUO FeiFei JI WenHua LI RongShe CHEN ShouJian ZHAO ZhenMing LIU XiaoJi | 2012 | Science China Earth Sciences2012，55，1： | 9 |
| 2 | Calcined Mg-AI Layered Double Hydroxide as a Heterogeneous Catalyst for the Synthesis of Urea Derivatives from Amines and CO2显示文摘有 3:1 的 Mg/Al 臼齿的比率的锻烧的 Mg-Al 分层的双氢氧化物(LDH ) 被 X 光检查彻底地综合并且描绘衍射(XRD ) , CO2 的规划温度的解吸附作用(TPD ) ,和 thermogravimetric 分析(TGA ) 。因此,锻烧的 Mg-Al LDH 从胺和 CO2 为 disubstituted 脲的催化合成被用作催化剂。在活动的反应时间,反应温度,压力,溶剂和锻烧的温度的效果被调查了。当,结果显示脂肪族的胺, cyclohexylamine 和 benzylamine 能与 N-methyl-2-pyrrolidone (NMP ) 在锻烧的 Mg-Al LDH 催化剂上有选择地被变换成相应的脲没有使用任何使脱水的总督的溶剂。催化剂能与活动的仅仅细微的损失若干次被再循环。 | Ran Zhang Li Hua Li Guo Baoning Song Jizhong Chen Zhenshan Hou | 2013 | Chinese Journal of Chemistry2013，31，3： | 1 |
| 3 | Study on Separation of Water and Alumina Fine Particles by Cross-Flow Microfiltration显示文摘A cross-flow microfiltration process had been developed to separate alumina fine particles from the suspension using a stainless steel membrane tube with a pore size of 10 μm. The influence of cross-flow velocity and trans-membrane pressure on the permeate flux and the solid holdup in permeate had been investigated. It was found that both the permeate flux and the solid holdup in permeate decreased with time. Moreover, the permeate flux increased with an increasing transmembrane pressure but the influence of cross-flow velocity on the permeate flux was quite complex. Both the permeate flux and the solid holdup in permeate in long term filtration had been studied. The operation of cross-flow microfiltration could be carried out stably for 10 hours with the permeate flux values ranging from 520.5 to 936 L/(m^2·h) at rs=1%, while it could continue in 10 hours with the permeate flux values ranging from 226 to 432 L/(m^2·h) at rs=5%. The solid holdup in permeate had been less than 10 mg/L during the whole operating cycle. | Zheng Bo Tang Xiaojin Hou Shuandi Zong Baoning | 2017 | China Petroleum Processing & Petrochemical Technology2017，19，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员