相转化法制备聚醚酰亚胺超滤膜

以不同相对分子质量的聚乙二醇（ＰＥＧ）作为添加剂，讨论了聚醚酰亚胺（ＰＥＩ）和ＰＥＧ混合的相行为，对于ωＰＥＩ＝０．２０的Ｎ，Ｎ－二甲基乙酰胺（ＤＭＡＣ）溶液，测定了多种非溶剂的相混合参数，其值的顺序为：乙醇〉甲醇〉乙二醇〉水。以及为凝固介质，制备了ＰＥＩ超滤膜，考察了水通量，牛血清蛋白ＢＳＡ的膜分离性能，此外，结合膜的电镜照片，探讨孙同相对分子质量ＰＥＧ对膜结构的影响。     

THE GENERAL CATEGORICAL CLASSES BP_N AND THEIR COMPLETENESS

ＴＨＥＧＥＮＥＲＡＬＣＡＴＥＧＯＲＩＣＡＬＣＬＡＳＳＥＳＢＰ_ＮＡＮＤＴＨＥＩＲ　ＣＯＭＰＬＥＴＥＮＥＳＳＴＨＥＧＥＮＥＲＡＬＣＡＴＥＧＯＲＩＣＡＬＣＬＡＳＳＥＳＢＰ＿ＮＡＮＤＴＨＥＩＲＣＯＭＰＬＥＴＥＮＥＳＳ￥ＳｕｎＨｕｉｃｈｅｎｇ；ＬｕＹｉｚｈｏ?..     

THE EFFECT OF ZnO ON BURNING OF PORTLAND CEMENT CLLNKER IN RAPID MEATING－UP BURNING

ＴＨＥＥＦＦＥＣＴＯＦＺｎＯＯＮＢＵＲＮＩＮＧＯＦＰＯＲＴＬＡＮＤＣＥＭＥＮＴＣＬＬＮＫＥＲＩＮＲＡＰＩＤＨＥＡＴＩＮＧ－ＵＰＢＵＲＮＩＮＧＸｕＧｕａｎｇｌｉａｎｇＳｏｕｔｈｗｅｓｔＩＮｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙＨｕａｎｇＷｅｎｘｉＣｈｅ...     

ACTIVECONTROLOFNOISETRANSMISSIONTHROUGHAPANELINTOACAVITYBYUSINGPANELACCELERATIONFEEDBACKCONTROLMETHO

ＡＣＴＩＶＥＣＯＮＴＲＯＬＯＦＮＯＩＳＥＴＲＡＮＳＭＩＳＳＩＯＮＴＨＲＯＵＧＨＡＰＡＮＥＬＩＮＴＯＡＣＡＶＩＴＹＢＹＵＳＩＮＧＰＡＮＥＬＡＣＣＥＬＥＲＡＴＩＯＮＦＥＥＤＢＡＣＫＣＯＮＴＲＯＬＭＥＴＨＯＤＱｉｕＸｉａｏｊｕｎＳｈａＪｉａｚｈｅｎｇＹａ...     

MONTE-CARLO CALCULATIONS OF NUCLEON EMISSION AND ENERGY DEPOSITION OF SPALLATION NEUTRON SOURCES INDUCED BY INTERMEDIATE ENERGY PROTONS

ＭＯＮＴＥ┐ＣＡＲＬＯＣＡＬＣＵＬＡＴＩＯＮＳＯＦＮＵＣＬＥＯＮＥＭＩＳＳＩＯＮＡＮＤＥＮＥＲＧＹＤＥＰＯＳＩＴＩＯＮＯＦＳＰＡＬＬＡＴＩＯＮＮＥＵＴＲＯＮＳＯＵＲＣＥＳＩＮＤＵＣＥＤＢＹＩＮＴＥＲＭＥＤＩＡＴＥＥＮＥＲＧＹＰＲＯＴＯＮＳＳｈｅｎＱｉ...     

ON THE WIND-POWERED NEBULA NGC 2359 AND THE WN STAR HD 56925

ＯＮＴＨＥＷＩＮＤ－ＰＯＷＥＲＥＤＮＥＢＵＬＡＮＧＣ２３５９ＡＮＤＴＨＥＷＮＳＴＡＲＨＤ５６９２５￥ＣｈｅｎＹａｎｇ；ＷａｎｇＺｈｅｎｒｕ；ＱｕＱｉｎｙｕｅ（ＤｅｐａｒｔｍｅｎｔｏｆＡｓｔｒｏｎｏｍｙ，ＮａｎｊｉｎｇＵｎｉｖｅｒｓｉｔｙ，２１００９３...     

MAGNETIC RELAXATION AT EARLY TIMES AND FLUX DIFFUSION BARRIER V（J，B，T） FOR Ti－1223 DOPED WITH Pb AND Ba BY COMPLEX AC SUSCEPTIBILITY MEASUREMENTS

ＭＡＧＮＥＴＩＣＲＥＬＡＸＡＴＩＯＮＡＴＥＡＲＬＹＴＩＭＥＳＡＮＤＦＬＵＸＤＩＦＦＵＳＩＯＮＢＡＲＲＩＥＲＶ（Ｊ，Ｂ，Ｔ）ＦＯＲＴｉ－１２２３ＤＯＰＥＤＷＩＴＨＰｂＡＮＤＢａＢＹＣＯＭＰＬＥＸＡＣＳＵＳＣＥＰＴＩＢＩＬＩＴＹＭＥＡＳＵＲＥＭＥＮＴＳＤ...     

THE CURRENT DENSITY DEPENDENCE OF ACTIVATION ENERGY IN HIGH－Tc SUPERCONDUCTOR HgBa_2Ca_2Cu_3O_（8＋x） IN LOW CURRENT DENSITY

ＴＨＥＣＵＲＲＥＮＴＤＥＮＳＩＴＹＤＥＰＥＮＤＥＮＣＥＯＦＡＣＴＩＶＡＴＩＯＮＥＮＥＲＧＹＩＮＨＩＧＨ－ＴｃＳＵＰＥＲＣＯＮＤＵＣＴＯＲＨｇＢａ_２Ｃａ_２Ｃｕ_３Ｏ_（８＋ｘ）ＩＮＬＯＷＣＵＲＲＥＮＴＤＥＮＳＩＴＹＴＨＥＣＵＲＲＥＮＴＤＥＮＳＩＴＹＤＥ...     

用生氧量确定英公水库最佳施肥浓度及比例的试验

用生氧量确定英公水库最佳施肥浓度及比例的试验＊ＡＮＥＸＰＥＲＩＭＥＮＴＯＦＴＨＥＢＥＳＴＣＯＮＣＥＮＴＲＡＴＩＯＮＡＮＤＲＡＴＩＯＯＦＡＰＰＬＶＩＮＧＦＥＲＴＩＬＩＺＥＲＩＮＴＨＥＹＩＮＧＧＯＮＧＲＥＳＥＲＶＯＩＲＤＥＴＥＭＩＮＥＤＢＹＯＸＹＧＯＮＥ...     

INSITUCOMBINEDTEMPERATUREPROGRAMMEDREDUCTION─MOSSBAUERSPECTROSCOPICTECHNIQUESTUDYOFTHEINTERMEDIATESF

ＩＮＳＩＴＵＣＯＭＢＩＮＥＤＴＥＭＰＥＲＡＴＵＲＥＰＲＯＧＲＡＭＭＥＤＲＥＤＵＣＴＩＯＮ┐ＭＯＳＳＢＡＵＥＲＳＰＥＣＴＲＯＳＣＯＰＩＣＴＥＣＨＮＩＱＵＥＳＴＵＤＹＯＦＴＨＥＩＮＴＥＲＭＥＤＩＡＴＥＳＦＯＲＭＥＤＤＵＲＩＮＧＴＨＥＲＥＤＵＣＴＩＯＮＯＦ...     

Influence of microstructure on the corrosion resistance of Fe–44Ni thin films

An Fe–44Ni nanocrystalline (NC) alloy thin film was prepared through electrodeposition. The relation between the microstructure and corrosion behavior of the NC film was investigated using electrochemical methods and chemical analysis approaches. The results show that the NC film is composed of a face-centered cubic phase (γ-(Fe,Ni)) and a body-centered cubic phase (α-(Fe,Ni)) when it is annealed at temperatures less than 400℃. The corrosion resistance increases with the increase in grain size, and the corresponding corrosion process is controlled by oxygen reduction. The NC films annealed at 500℃ and 600℃ do not exhibit the same pattern, although their grain sizes are considerably large. This result is attributed to the existence of an anodic phase, Fe_0.947Ni_0.054, in these films. Under this condition, the related corrosion process is synthetically controlled by anodic dissolution and depolarization.     

盐酸维拉佐酮片的制备及体外溶出度的一致性考察

以原研制剂为参考,采用直接压片法制备盐酸维拉佐酮片;运用高效液相色谱法,建立合适的体外溶出度测定方法,对两者的体外溶出行为进行一致性评价.通过单因素试验对辅料的用量进行筛选并确定最佳处方,制备出盐酸维拉佐酮片.然后,以原研药为参比制剂,考察自制品在醋酸溶液(pH=3.1)、水、磷酸盐缓冲液(pH=6.8)、盐酸溶液(pH=1.0)中的溶出情况,并计算相似因子(f₂),评价自制品与参比制剂溶出行为的相似性.结果表明:自制品与原研制剂在4种溶出介质中的溶出行为相似,f₂均大于50.所建立的溶出度曲线测定方法准确、可靠,可为盐酸维拉佐酮片仿制药的一致性评价提供参考.     

氧化铝在熔融冰晶石中的溶解

利用透明石英槽对氧化铝在熔融冰晶石的溶解行为进行了研究,并用摄相机观测、拍摄了整个溶解过程,分析与讨论了氧化铝溶解的影响因素·研究认为,氧化铝在熔融冰晶石中的溶解分两步,即氧化铝快速溶解和电解质表面形成结壳的氧化铝的脱落与溶解·氧化铝在熔融冰晶石中的溶解由快变慢是由于氧化铝的加入导致电解质温度降低,在电解质表面形成氧化铝/电解质结块,使氧化铝与冰晶石接触的表面积下降·氧化铝的溶解速度与搅拌速度、氧化铝的预热温度、体系的温度和氧化铝的种类有关·     

GAP改性单基球形药的热分解性能研究

采用热重-微热重(TG-DTG)和差示扫描量热(DSC)实验,研究了纯单基球(NC)、聚叠氮缩水甘油醚(GAP)以及GAP改性的单基球形药的热分解性能,探索了球药中主要组分NC和GAP之间的相互作用. 实验结果表明:GAP质量分数分别为20%和30%的改性单基球形药在发生热分解时,存在GAP的热分解过程,且其主链的热分解峰值温度较纯,GAP相应的峰值温度分别提前3.5℃和8.4℃. DSC测试显示,NC的热分解产物和热量使GAP质量分数为20%和30%的改性单基球中—N₃基团的放热峰分别降低8.18℃和7.70℃,即发现在GAP改性的单基球中,NC的存在对GAP的热分解具有一定的促进作用.      

Dissolution behavior and dissolution mechanism of palygorskite in HCl solution

The 1 mol/L, 3 mol/L and 5 mol/L HCl solutions were employed to leach two palygorskites with different trioctahedral contents in their crystal structure for different period of time. The results of the dissolution experiments show that the dissolution process could be divided into three steps, and that this dissolution behavior can be attributed to its higher Mg2+ content, and is restricted by the extraction behavior of Si4+. The preferential extraction for Mg2+ promotes the extraction behavior of Si4+ from Si-O framework. Because the Si4+ in the form of amorphous SiO2 is adsorbed onto the surface of palygorskite fibre, the reaction between palygorskite and acid is obstructed. With the elapsing of time, or the increasing of the acid concentration, the amorphous SiO2 flocculates, and then the channels of chemical reaction are reopened. The ratio value of Mg2+/(Fe3++Al3+) in leaching solution tends to a fixed value, showing that the acid attacks not only the surface but also the structural channels. There are no obvious three steps observed during the acid attack on the palygorskite with a lower trioctahedral content. The differential behavior for two palygorskites is discussed.     

Investigation on the dissolution of η phase in a cast Ni-based superalloy

The dissolution behavior of η phase has been investigated in a cast Ni-based superalloy. The results showed that the platelets and blocks of η phase were formed within the interdendritic regions of the microstructure. Applying standard solution annealing at 1150–1160℃ for a period of 4 h did not result in the complete dissolution of η phase. For the complete dissolution of η phase without residual incipient melting, a 2-step solution annealing has been recommended. After dissolution at high temperatures, the η phase transforms to two MC-type carbides: one is enriched in Ti, Nb, and Ta, and the other is of (Zr,Ti)C type.     

高温高浓度溴化锂溶液中磷脱氧铜耐蚀性研究

利用电化学测试技术和化学业浸泡法对磷脱氧铜在高温65%LiBr溶液中的耐蚀性进行了研究。结果表明,LiOH对腐蚀行为起双重作用,低浓度有利于形成Cu2O、CuO氧化膜,而高浓度则形成HCu2O2^-和CuO2^2-型化合物,促进氧化膜溶解;最佳LiOH浓度为0.10mol/L,65%LiBr 0.10mol/L LiOH溶液中添加200mg/L Na2MoO4时缓蚀效果较好,这是由于吸附在阳极表面的MoO4^2-参与电极反应过程,还原生成的MoO2掺杂在Cu2O和CuO氧化膜中阻碍侵蚀性Br^-吸附,有效地抑制铜的活性溶解。     

直线滚动导轨结合面参数对数控机床动态特性的影响

对某机床厂CKS6116卧式数控机床导轨结合面的静、动刚度与阻尼等参数特性进行了研究.首先利用静、动态特性实验得出机床的各项动态参数,然后用ANSYS有限元分析软件模拟和显示机床在考虑导轨结合面参数条件下的各阶模态下的振型和固有频率.最后对整个机床进行激振试验,验证了仿真参数的准确性.说明直线滚动导轨结合面的静、动刚度与阻尼对机床的动态特性具有很大的影响.     

齿条双齿轮伺服机构的设计

为了满足数控大型机床的设计需要,建立了齿条双齿轮伺服机构设计参数优化数学模型,并根据数学模型设计出计算方法和优化程序。运用传递矩阵结合信号流程图的方法,分析了齿条双齿轮机构的动态特性和薄弱环节。研究表明,在床身长 5m以上的数控大型机床上,采用齿条双齿轮机构会获得良好的动态特性;在齿条双齿轮机构中,末端轴的刚度和第一级齿轮惯量是其薄弱环节。在 C84100B 轧辊车床设计中,本文的研究得到了成功的应用。     

焙烧对伊利石在酸中溶解行为的影响

采用热分析(TG-DSC)、红外光谱(FTIp)和X线衍射(XRD)等手段,考察伊利石在焙烧过程中的晶体结构变化规律;通过焙烧后伊利石在硫酸溶液中的溶解实验,研究伊利石中Al,K和Si焙烧前后的溶出率变化。研究结果表明：焙烧促使伊利石晶体结构中四面体和八面体结构发生调整和变形,从而使八面体中Al元素赋存的化学环境发生变化,溶出活性显著增强,在H2SO4浓度为3 mol/L、温度为95℃、液固比为5/1 mL/g,转速为600 r/min条件下焙烧,Al在等体积的溶出液中,浓度由77.56 mmol/L提高到203.90 mmol/L。