548 research outputs found
Desain Sistem Pengendali Posisi Sumbu Azimuth Pada Turret Gun Dengan PI Controller Metode Root-Locus
No full textTurret Gun merupakan salah satu sistem senjata proyektil yang telah digunakan pada beberapa perangkat dan kendaraan tempur seperti tank dengan menggerakkan arah senapan dari tank sesuai target atau gangguan yang telah ditentukan. Turret Gun mempunyai 2 sistem sumbu gerak yaitu, elevasi dan azimut. Salah satu aspek yang dikembangan dari penelitian ini adalah ketepatan dan kecepatan untuk mencapai posisi target dari arah senapan tank, karena apabila semakin besar ukuran dari turret gun maka akan semakin sulit untuk dikendalikan. Tujuan dari penelitian ini adalah untuk merancang sistem kendali PI (Propotional Integral) dengan metode Root-Locus untuk mengatur posisisi sumbu azimuth dari turret gun. Dengan implementasi nilai Kp = 10,695 dan Ki = 38,739 pada setpoint 60? data dari hasil penelitian diperoleh nilai rise time (Tr) sebesar 0,0317 detik, nilai settling time (Ts) sebesar 0,3308 detik, nilai maximum overshoot (MO) sebesar 4,51 %, dan nilai error steady state (Ess) sebesar 0%.
Kata Kunci: Azimuth, Integral, Proposional, Root Locus, Turret Gun
Ore geology, fluid inclusions and four-stage hydrothermal mineralization of the Shangfanggou giant Mo-Fe deposit in Eastern Qinling, central China
No full textThe Eastern Qinling, Central China, containing more than 20 Mesozoic porphyry +/- skarn systems, is the most important Mo province in the world. The Shangfanggou giant Mo deposit, Luanchuan County, Henan Province, is a porphyry-skam system hosted in a lithologic association comprising carbonaceous sandstone, shale, carbonate and chert within the Neoproterozoic Luanchuan Group. Mo ores are mainly altered porphyry, skam and hornfels, with minor altered gabbro. The mineralization process includes four stages, potassic alteration of the porphyry and skamization of dolomite marble in stage 1, stockworlcs of quartz + molybdenite +/- sulfide (stage 2), pyrite + quartz +/- sulfides (stage 3), and carbonate +/- quartz +/- fluorite (stage 4), respectively. Mo mineralization was generally associated with strong silicification and/or phyllic alteration. The fluid inclusions in minerals include three compositional types, i.e., CO2-bearing (C-type), aqueous (W-type) and daughter mineral-bearing (S-type). Minerals formed in stages I to 3 contain all the three types of Fls, but the stage 4 minerals only contain the W-type Fls. Oxides and Cu-phosphate are recognized as daughter minerals in S-type inclusions in minerals of stage 1, whereas the daughter sulfide and reducing gases such as CO, CH4, H2S and C2H6 can be observed in quartz of stages 2 and 3, suggesting that the ore-forming fluids were initially oxidizing and then evolved to reducing. Boiling fluid inclusion assemblages can be observed in minerals formed in stage 2 or earlier, but not in stage 3 or later. Fluid boiling caused CO2 escape, oxygen fugacity decrease and rapid precipitation of ore minerals, and was a key factor causing Mo-mineralization at Shangfanggou. Data and interpretations presented in this contribution show that the fluids forming the Shangfanggou Mo deposit evolved from CO2-rich, high-salinity hypothermal, to CO2-poor, low-salinity epithermal (low-T). The Mo mineralization at the Shangfanggou deposit mainly occurred at depth of 6.6-7.0 km, deeper than the majority of porphyry systems in volcanic arcs, which resulted from a CO2-rich magma-fluid system originating from partial melting of thickened lower crust The Shangfanggou mineral system developed during 158-134 Ma when the Yangtze-North China continental collision began to evolve from compression to extension. Magmatic hydrothermal deposits developed in a continental collision regime are generally formed by CO2-rich, high-salinity fluids. (C) 2013 Elsevier B.V. All rights reserved.GeologyMineralogyMining & Mineral ProcessingSCI(E)EI11REVIEWC146-1615
Phase Transformation of Mo and W over Co OR Its Alloy in Contact with Si
No full textABSTRACTW or Mo directly deposited on Si cold substrate by electron-beam gun at a base pressure of 10-6 torr is not able to form silicide even annealed at 900 °C in either N2 or H2 ambient. We present an easy way that Mo and W silicides can be formed on the same depositing and annealing conditions with the help of an intervened layer of cobalt or its alloy. Investigation was made on various metallizations of Mo (or W)/Co/Si, W/Co-Mo/Si, and Co/Mo/Si in normal flowingnitrogen or in H2 ambient at various temperatures. In the systems of Mo (or W)/Co/Si and W/Co-Mo/Si, the overlying Mo (or W) can be transformed into silicide at 900 °C, while in the Co/Mo/Si system, where stable Co-Mo compounds are formed in advance, no silicide can be formed. Why silicide is formed in preference to metal oxide in N2 environment at higher temperature is based on Ellingham diagram.</jats:p
Evolution of ore fluids in the Donggou giant porphyry Mo system, East Qinling, China, a new type of porphyry Mo deposit: Evidence from fluid inclusion and H-O isotope systematics
No full textThe Donggou Mo deposit in the eastern Qinling area, China, is a giant porphyry system discovered based on a targeting concept by using the tectonic model for collisional orogeny, metallogeny and fluid flow (CMF model). Mo mineralization is associated with the Donggou aluminous A-type granite porphyry and was formed during the Early Cretaceous in a tectonic regime of continental extension. The orebodies mainly occur as numerous veinlets in the host-rocks. Hydrothermal ore-forming processes include at least three stages, characterized by veinlets of (1) quartz + K-feldspar + minor molybdenite, (2) quartz + molybdenite +/- beryl and (3) quartz + carbonate + fluorite. Three types of fluid inclusions (FIs) are distinguished in quartz and beryl in stages 1 and 2, i.e., aqueous (W-type), carbonic-aqueous (C-type) and solid-bearing (S-type), with only aqueous FIs observed in stage 3 minerals. S-type FIs contain variable daughter minerals including halite, chalcopyrite, calcite and an unidentified transparent crystal, but only halite can dissolve during heating. Halite-bearing S-type FIs are mainly homogenized by halite dissolution at 182-416 degrees C, corresponding to salinities of 30.9-49.2 wt.% NaCl equiv.; minor halite-bearing S-type FIs are homogenized to liquid at 190-360 degrees C via vapor disappearance, with salinities of 29.1-36.2 wt.% NaCl equiv. Other FIs in minerals of stages 1, 2 and 3 are homogenized at temperatures of 341-550 degrees C, 220-440 degrees C and 125-225 degrees C, with salinities of 8.0-18.3, 5.3-16.8 and 0.5-7.3 wt.% NaCl equiv., respectively. The estimated minimum trapping pressures are up to 141 MPa in stage 1 and up to 81 MPa in stage 2, respectively, corresponding to an initial mineralization depth of no less than 5 km. The quartz in veinlets yields delta O-18 values of 85-10.0%0, corresponding to delta(OH2O)-O-18 values of -2.9 to 5.9%., while the delta D-H2O values of fluid inclusions range from -59 to -82%.. These data suggest that the ore fluids forming the Donggou deposit changed from high-temperature, high-salinity, CO2-rich magmatic to low-temperature, low-salinity and CO2-poor meteoritic fluids via boiling and mixing, resembling those of other magmatic-hydrothermal systems in Qinling Orogen and Dabie Shan. This supports the notion that the porphyry systems generated in a post-collisional tectonic setting were initially CO2-rich, as indicated by abundant C-type and CO2-bearing S-type fluid inclusions. (C) 2014 Elsevier B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000348084400009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701GeologyMineralogyMining & Mineral ProcessingSCI(E)EI24ARTICLEP1148-1646
MAGNETIC-PROPERTIES OF ANISOTROPIC ND(FE,MO)12NX POWDERS
No full textAnisotropic magnets based on Nd(Fe,Mo)12Nx nitrides were prepared by a milling process. Particle size dependence of the coercivity has been investigated. The optimizing size which accompanies the highest coercive force was examined by transmission electron microscopy. A coercive force (i)H(c) of up to 6.2 kOe, and a maximum energy product (BH)max of up to 12.0 MG Oe were obtained. The mechanism of the coercivities is discussed with a comparison of the powders prepared by mechanical alloying. The variation of coercive force as a function of temperature is reported.Physics, AppliedSCI(E)7ARTICLE31745-17487
Mo-modified MnOx for the efficient oxidation of high-concentration glucose to formic acid in water
No full textSevere Mo-modified MnOx binary oxide catalysts were synthesized and served as highly active catalysts for the
oxidation of glucose to formic acid in water. A maximum formic acid yield of 79% was achieved from glucose
(10 g/L) over Mo(1)-MnOx at 160 ◦C after 90 min of reaction time. Even when the initial glucose concentration
was 110 g/L, 54% of formic acid yield could be obtained with Mo(1)-MnOx, which was almost twice the yield
obtained with pristine MnOx as the catalyst. Characterization results showed that the low valence Mn (Mn2+ and
Mn3+) ions were the active sites and played key roles in the oxidation of glucose to formic acid. The introduction
of Mo could increase the content of low valence Mn (Mn2+ and Mn3+) ions and the adsorbed oxygen (Oads) ratio.
A mechanism study indicated that arabinose and glyoxylic acid were the dominant intermediates. Various carbohydrates (xylose, fructose, maltose, sucrose, cellobiose) with high initial concentration afforded formic acid
yields >45% demonstrating the potential of Mo(1)-MnOx for transforming lignocellulosic biomass to formic acid
Preparation of anisotropic Nd(Fe,Mo)(12)N-x magnetic materials by the strip-casting technique
No full textStrip-casting technique is used to prepare anisotropic Nd(Fe,Mo)(12)N-x compounds. It is found that, by this technique, the single-phase Nd(Fe,Mo)(12) compounds can be directly obtained without postannealing at a rolling velocity of 3 m/s and with an Fe-to-Mo ratio of 7. Under the same nitrogenation conditions, it is easier to introduce the nitrogen atoms into the strip-cast Nd(Fe,Mo)(12) powders than into the conventionally cast powders. The microstructure studies of the ingots show that not only the size of strip cast Nd(Fe,Mo)(12) grains is small, but also the size distribution of the grains is narrow as compared with those of conventionally cast ingots. Thus, the strip-casting technique is used to synthesize the anisotropic powders of Nd(Fe,Mo)(12)N-x with a B-r of 1.10 T, an H-i(c) of 448 kA/m, and a (BH)(max) of 160 kJ/m(3). (C) 2006 American Institute of Physics.Physics, AppliedSCI(E)EI2ARTICLE8null9
Studying the Voice of Mo Yan and Howard Goldblatt: Zhang Kou in the Garlic Ballads
No full textIn 2012, a Chinese, Mo Yan 莫言, became the laureate of the Nobel Prize in Literature. It was the first time in China’s history; this is not because Mo Yan is better than other Chinese writers, or that he follows some Western writers like Gabriel García Márquez, but because he works with better translators, who make his stories captivating for Western readers, than whom his precursors work with. Even though Mo Yan sticks closely to dialect and culture in rural areas in northern China, his translators adjust his writings to an accessible form in another language. In order to understand why these translations make Mo Yan’s works popular in the Western world, this thesis focuses onMo Yan’s English translator, Howard Goldblatt, and studies his translation techniques. This thesis aims at a minor character, Zhang Kou 张扣, in one of Mo Yan’s understudied novels, The Garlic Ballads Tiantang suantai zhi ge 天堂蒜薹之歌. The novel received not as much scholarly attention as his Red Sorghum Clan Hong gaoliang jiazu 红高粱家 族, so scholarship of Zhang Kou is limited. By analogizing the Chinese and English version of the standby of the garlic riot Zhang Kou, both the writing style of Mo Yan and the translating features of Goldblatt are part of this discussion. With the analyses of Zhang Kou’s representation of the voice of both the author and the translator, Mo Yan’s original depictions of Zhang Kou contrast with Goldblatt’s rewriting of the counterparts; it reveals how the two voices, though articulated by the same character, are different. In this thesis, the introduction to Goldblatt’s translating techniques focuses on how he overcomes the barriers between the two languages and unites his own voice with that of Mo Yan. By concentrating on the transformation of Zhang Kou’s voice, this thesis argues that Goldblatt adapts Mo Yan’s voice to the English-speaking world rhetorically, culturally and ideologically, and that this is the reason why he makes Mo Yan’s writing popular in the West
Financial Security of Elders in China
No full textChina is one of the largest countries in the world in terms of both geography and population size, with lower economic levels compared to the developed countries, and great regional differences. This paper introduces the rapid demographic changes of the Chinese population and the current financial security of elders in China. The World Bank’s multi-pillar model is used to explain the financial security of elders in China, which includes the current pension and health care systems in urban and rural areas in China respectively. The important issues of financial security of elders which the Chinese government should address in the near future are also discussed. The paper concludes with a consideration of the results of social welfare system reforms by the Chinese government and future research interests from a geographer’s perspective.Financial security, elders, social welfare system, China
Mo Yan in Context : Nobel Laureate and Global Storyteller
No full textIn 2012 the Swedish Academy announced that Mo Yan had received the Nobel Prize in Literature for his work that “with hallucinatory realism merges folk tales, history, and the contemporary.” The announcement marked the first time a resident of mainland China had ever received the award. This is the first English-language study of the Chinese writer’s work and influence, featuring essays from scholars in a range of disciplines, from both China and the United States. Its introduction, twelve articles, and epilogue aim to deepen and widen critical discussions of both a specific literary author and the globalization of Chinese literature more generally.
The book takes the “root-seeking” movement with which Mo Yan’s works are associated as a metaphor for its organizational structure. The four articles of “Part I: Leaves” focus on Mo Yan’s works as world literature, exploring the long shadow his works have cast globally. Howard Goldblatt, Mo Yan’s English translator, explores the difficulties and rewards of interpreting his work, while subsequent articles cover issues such as censorship and the “performativity” associated with being a global author. “Part II: Trunk” explores the nativist core of Mo Yan’s works. Through careful comparative treatment of related historical events, the five articles in this section show how specific literary works intermingle with China’s national and international politics, its mid-twentieth-century visual culture, and its rich religious and literary conventions, including humor. The three articles in “Part III: Roots” delve into the theoretical and practical extensions of Mo Yan’s works, uncovering the vibrant critical and cultural systems that ground Eastern and Western literatures and cultures. Mo Yan in Context concludes with an epilogue by sociologist Fenggang Yang, offering a personal and globally aware reflection on the recognition Mo Yan’s works have received at this historical juncture.https://docs.lib.purdue.edu/purduepress_ebooks/1039/thumbnail.jp
- …
