In Milton＇s Paradise Lost, Satan is conspicuously depicted as the ＂mighty chief＂ （I 566） and ＂the dread commander＂ （I 589） of the rebel army. True to the Hebrew meaning of his name, Satan poses appropriately ...In Milton＇s Paradise Lost, Satan is conspicuously depicted as the ＂mighty chief＂ （I 566） and ＂the dread commander＂ （I 589） of the rebel army. True to the Hebrew meaning of his name, Satan poses appropriately as a grand ＂Adversary＂ （I 629; II 282） to ＂wage by force or guile eternal war＂ （I 121） against God. The poet has deliberately built up a parallel between Satan and Christ the Son, who is the commander-in-chief of the angelic army. With ＂Almighty arms / Gird on, and Sword upon [his] puissant Thigh＂ （VI 713-14）, the Son certainly makes an impressive figure of warrior-general. Satan＇s stance as the ＂idol of majesty divine＂ is really extraordinary. During the War in Heaven, he does show superhuman courage and strength; his ability to change his bodily form has no doubt increased his potential as a warrior. Furthermore, he commands a highly disciplined army, surpassing by far the best troops in human history. All this seems to indicate Satan as a great hero. Even before God proclaims the Son to be raised ＂by merit＂ to the position of＂second omnipotence＂ （III 309）, Milton has already made it clear to the reader that Satan, too, is ＂by merit rais＇d / To that bad eminence＂ （II 5-6）. This ambivalent merit of Satan has incurred heated controversy among the critics. The present paper will set out to analyze the encounter between Satan and the Son in Paradise Lost, in an effort to determine the true meaning of heroism.展开更多
Liners in wet ball mill for mineral processing industry must bear abrasive wear and corrosive wear, and consequently, the service life of the liner made from traditional materials, such as Hadfield steel and alloyed s...Liners in wet ball mill for mineral processing industry must bear abrasive wear and corrosive wear, and consequently, the service life of the liner made from traditional materials, such as Hadfield steel and alloyed steels, is typically less than ten months. Bimetal liner, made from high Cr white cast iron and carbon steel, has been successfully developed by using liquid-liquid composite lost foam casting process. The microstructure and interface of the composite were analyzed using optical microscope, SEM, EDX and XRD. Micrographs indicate that the boundary of bimetal combination regions is staggered like dogtooth, two liquid metals are not mixed, and the interface presents excellent metallurgical bonding state. After heat treatment, the composite liner specimens have shown excellent properties, including hardness 〉 61 HRC, fracture toughness ak 〉16.5 J.cm2 and bending strength 〉1,600 MPa. Wear comparison was made between the bimetal composite liner and alloyed steel liner in an industrial hematite ball mill of WISCO, and the results of eight-month test in wet grinding environment have proved that the service life of the bimetal composite liner is three times as long as that of the alloyed steel liner.展开更多
Lost circulations have presented great challenges to the petroleum industry, causing great expenditures of cash and time to fighting the problem. Probably the most problematic situations are the naturally fractured fo...Lost circulations have presented great challenges to the petroleum industry, causing great expenditures of cash and time to fighting the problem. Probably the most problematic situations are the naturally fractured formations where the operator may face total loss with no mud return in the annular. The voids or large fracture encountered in this case are often far too large to be plugged with conventional Lost Circulation Material. This paper will give a detailed introduction on a novel composite gel material usable to control severe losses and pressurization sealing. The plugging mechanics of this new composite gel material, which is different from conventional lost circulation materials, were elaborated as well. In addition, the properties of the new composite gel material such as thermostability, sealing strength and bearing resistance are characterized with specific experimental devices. The experimental results proved that the breakdown pressure of the new plugging reached more than 20MPa, and the maximum degraded temperature can be exceed 130℃. The field application at 4 wells in Puguang gas field, SINOPEC, demonstrated that the new composite gel material solved the serious loss in Ordovician carbonate fractured formation successfully and guaranteed the following completion cement operation smoothly. The composite gel sealing slurries, which was easily prepared on site, gives remarkable properties regarding pumping through drill pipes, adjustment of setting time and excellent sealing strength of the lost zone sealing, additionally, the whole pressurization sealing process was complicated within only ten hours. The on-site results show that the plugging ratio of the new composite gel was reached 100%, and the success rate of sealing operation kept above 80%.Thus the new LCM can guarantee safe drilling jobs and save operation cost more effectively.展开更多
文摘In Milton＇s Paradise Lost, Satan is conspicuously depicted as the ＂mighty chief＂ （I 566） and ＂the dread commander＂ （I 589） of the rebel army. True to the Hebrew meaning of his name, Satan poses appropriately as a grand ＂Adversary＂ （I 629; II 282） to ＂wage by force or guile eternal war＂ （I 121） against God. The poet has deliberately built up a parallel between Satan and Christ the Son, who is the commander-in-chief of the angelic army. With ＂Almighty arms / Gird on, and Sword upon [his] puissant Thigh＂ （VI 713-14）, the Son certainly makes an impressive figure of warrior-general. Satan＇s stance as the ＂idol of majesty divine＂ is really extraordinary. During the War in Heaven, he does show superhuman courage and strength; his ability to change his bodily form has no doubt increased his potential as a warrior. Furthermore, he commands a highly disciplined army, surpassing by far the best troops in human history. All this seems to indicate Satan as a great hero. Even before God proclaims the Son to be raised ＂by merit＂ to the position of＂second omnipotence＂ （III 309）, Milton has already made it clear to the reader that Satan, too, is ＂by merit rais＇d / To that bad eminence＂ （II 5-6）. This ambivalent merit of Satan has incurred heated controversy among the critics. The present paper will set out to analyze the encounter between Satan and the Son in Paradise Lost, in an effort to determine the true meaning of heroism.
基金supported by the National Natural Science Foundation of China under grant No.50805109the Fundamental Research Funds for the Central Universities under grant No.2011-1a-023
文摘Liners in wet ball mill for mineral processing industry must bear abrasive wear and corrosive wear, and consequently, the service life of the liner made from traditional materials, such as Hadfield steel and alloyed steels, is typically less than ten months. Bimetal liner, made from high Cr white cast iron and carbon steel, has been successfully developed by using liquid-liquid composite lost foam casting process. The microstructure and interface of the composite were analyzed using optical microscope, SEM, EDX and XRD. Micrographs indicate that the boundary of bimetal combination regions is staggered like dogtooth, two liquid metals are not mixed, and the interface presents excellent metallurgical bonding state. After heat treatment, the composite liner specimens have shown excellent properties, including hardness 〉 61 HRC, fracture toughness ak 〉16.5 J.cm2 and bending strength 〉1,600 MPa. Wear comparison was made between the bimetal composite liner and alloyed steel liner in an industrial hematite ball mill of WISCO, and the results of eight-month test in wet grinding environment have proved that the service life of the bimetal composite liner is three times as long as that of the alloyed steel liner.
文摘Lost circulations have presented great challenges to the petroleum industry, causing great expenditures of cash and time to fighting the problem. Probably the most problematic situations are the naturally fractured formations where the operator may face total loss with no mud return in the annular. The voids or large fracture encountered in this case are often far too large to be plugged with conventional Lost Circulation Material. This paper will give a detailed introduction on a novel composite gel material usable to control severe losses and pressurization sealing. The plugging mechanics of this new composite gel material, which is different from conventional lost circulation materials, were elaborated as well. In addition, the properties of the new composite gel material such as thermostability, sealing strength and bearing resistance are characterized with specific experimental devices. The experimental results proved that the breakdown pressure of the new plugging reached more than 20MPa, and the maximum degraded temperature can be exceed 130℃. The field application at 4 wells in Puguang gas field, SINOPEC, demonstrated that the new composite gel material solved the serious loss in Ordovician carbonate fractured formation successfully and guaranteed the following completion cement operation smoothly. The composite gel sealing slurries, which was easily prepared on site, gives remarkable properties regarding pumping through drill pipes, adjustment of setting time and excellent sealing strength of the lost zone sealing, additionally, the whole pressurization sealing process was complicated within only ten hours. The on-site results show that the plugging ratio of the new composite gel was reached 100%, and the success rate of sealing operation kept above 80%.Thus the new LCM can guarantee safe drilling jobs and save operation cost more effectively.
