熊秉明艺术探索的中西镜像及其边界超越

旅法艺术理论家、艺术家熊秉明经历了从中国到西方,再从西方返回中国的跨文化;从哲学到艺术,再从艺术延伸至其他学科的跨学科;还有博涉雕塑、书法、诗歌等多种艺术的跨门类,从而使东方与西方、传统与现代、艺术体验与理论思考熔铸一体。他的艺术探索体现出一种独特的思想个性——异学互鉴,也就是中西两种异质性学术文化之间发生相互借鉴从而产生新的艺术思想的情形,其中包含五个环节:异学互望、异学互激、异学互惠、异学更生、异学新境。此外,熊秉明的典型意义还在于,他是20世纪艺术界理论与实践兼备的通会人格化身,并致力于构建理论与实践之间互通反哺的双向路径。熊秉明跨文化的艺术经验与面向实践的理论构想对于当前中西文化交流与文化复兴具有宝贵的启示意义。

Role of inclination angle on columnar-to-equiaxed transition in the eutectic Al-5Mg-2Si alloy fabricated by laser powder bed fusion

In this study,the effect of inclination angles relative to the building direction in the additively manufactured eutectic Al-5Mg-2Si alloy was investigated through the laser powder bed fusion(LPBF).The microstructures and mechanical properties of the Al-5Mg-2Si alloy manufactured with different inclination angles(0°,30°,45°,60°and 90°)were reported and discussed.It is found that the“semicircular”melt pool(MP)in the load bearing face of 0°sample was eventually transformed into“stripe-like”MP in the 90°sample,accompanied by an increased fraction of melt pool boundaries(MPBs).Moreover,the microstructural analysis revealed that the columnar-to-equiaxed transition(CET)of theα-Al grains and eutectic Mg2Si was completed in the 90°sample,which were significantly refined with the average size of 10.6μm and 0.44μm,respectively.It is also found that the 90°sample exhibited good combination of strength and elongation(i.e.yield strength of 393 MPa,ultimate tensile strength of 483 MPa and elongation of 8.1%).The anisotropic mechanical properties were highly associated with the refined microstructures,thermal stress,and density of MPBs.Additionally,the CET driven by inclination angles was attributed to the variation of thermal conditions inside the local MPs.

Supported Ziegler-Natta catalysts from MgCl_(2)·nROH precursors and its catalytic behaviors for diene copolymerization

Heterogeneous TiCl4/MgCl_(2) type Ziegler-Natta(Z-N)catalysts with unique advantages like low cost,high activity,high stereoregularity and pretty particle morphology,contribute to more than 130 Mt polyolefin large-scale production.However,most researches related with heterogeneous Z-N catalysts focused onα-olefin polymerizations like ethylene,propylene,etc.

异学段同题异构,促计算思维进阶发展

作者围绕“算法”核心概念的建构,在小学、初中和高中三个阶段,通过基于问题解决的综合实践课,剖析了培养学生计算思维的不同层级,探究了计算思维的纵向发展路径。

Internet:被解放的新闻价值观

随着时代的变迁和网络新闻实践中认知的不断积淀 ,对现有的新闻价值观作理论修正的必要性日益明显。首先 ,作为传统新闻思想核心的、关于“客观性”的价值 ,在网络新闻环境下 ,正在向“客观———主观性”的综合型价值观方向发展。其次 ,传统的新闻价值系统中诸种较为公认的元素或指向 ,在泛传播的条件下 ,也都正由单调的偏倚而走向辩证的统合。具体来说 ,由于把关人的缺失、匿名性、受众的交互性、网络平权以及新闻信息本身的泛化等诸多传播特征的出现 ,使得那种在文本生产及新闻理念上强调一元化旨趣限定的价值观 ,在网络新闻环境下已经出现了富有自组织性的新发展 ,这包括 :有关“异常性”的价值观正在向“异常———寻常性”的价值观方向发展 ;有关“影响性”的价值观正在向“影响———交响性”的价值观方向发展 ;有关“及时性”的价值观正在向“及时———全时性”的价值观方向发展 ;有关“冲突性”的价值观正在向“冲突———冲击性”的价值观方向发展 ;有关“显要性”的价值观正在向“显要———需要性”的价值观方向发展 ;有关“人情味”的价值观正在向“人情———人群性”的价值观方向发展等。

宇宙论与古代学术

古代学术的主要派别儒、墨、道、法四家,都存在宇宙论的根源。从大的区分看,重德性、讲灵魂、尚礼仪的儒家是西方属天的学说,而重欲望、重生产、重法治的法家是东方属地的学说。因为东西方文明的相互影响,古代学说又呈现出复杂的样貌。从重欲望的派别衍生出强调求欲望之中的派别,如荀子,其既有儒家重德的特征,又有法家尚法的色彩;从重德性、尚礼仪之学则衍生出讲地仁、讲法仪的墨子。这两派总体上看当归入东方学术类型。从宇宙论的角度讲,道家老子学说是属天的学说,但作为东方学术类型,其所重视的是女性精神。因为是从绝地天通框架下发展而来,老子排斥地对人的支配性。

ISOFLAVONES FROM ASTRAGALUS MEMBRANACEUS

Two new isoflavones (8, 3'-dihydroxy-7,4'-dimethoxyisoflavone, odoratin-7-0-[3-D-glu-copyranoside) and four known isoflavones (formononetin, 7,3'-dihydroxy-8,4'-dimethoxyisoflavone, calycosin, calycosin-7-0-(3-D-glucopyranoside) were isolated from the roots of Astragalus mem-branaceus (Fisch.) Bunge. Their structures were established by spectral analysis.

“关学”：在研究中延续--《关学文库》的意义

关学可以从狭义和广义两个层面来理解,狭义的关学主要指张载及其弟子之学,广义的关学则从张载之后延续至元明清乃至近代。宽泛而言,具有地域性的学派,总是既涉及空间,又关乎时间。关学作为一种学派,不管作狭义的理解还是广义的理解,同样也具有空间性和时间性。

Quantum Chemistry and QSAR Studies of Optical Isomers of 3-Methylfentanyl and Ohmefentanyl

The analgesic activities of four 3-methylfentanyl and eight ohmefentanyl optical isomers are very different. In seeking for the reason why a small change in structure leads to such a great difference in activity, we carried out quantum chemistry and QSAR investigations on these compounds. It was found that the spatial relationship between 3-methyl group and the anilidophenyl was most important. Other factors such as the net atomic charge on carbonyl oxygen and the configuration of 1-(-hydroxy also influenced the activities. PLS method was used for the construction of QSAR model. Using only 3 latent variables the correlation and predictive ability were quite satisfactory.

Friction stir keyholeless spot welding of AZ31 Mg alloy-mild steel

Friction stir keyholeless spot welding（FSKSW） using a retractable pin for 1.0 mm thick galvanized mild steel and 3 mm thick AZ31 B magnesium alloy in a lap configuration was investigated.The process variables were optimized in terms of the joint strength.The effects of the stacking sequence on joint formation and the joining mechanism of FSKSW AZ31B-to-mild steel joints were also analyzed.It shows that the process window and joint strength are strongly influenced by the stacking sequence of the workpieces.While the process window is narrow and unstable for FSKSW of a magnesium-to-steel stack-up,a desirable process was established for the steel-to-magnesium stacking sequence,a desirable process and higher strength joint can be got when the steel-to-magnesium stacking sequence.XRD phase and EPMA analyses of the FSKSW joint showed that the intermetallic compounds are formed at the steel-to-magnesium interface,and the element diffusion between the mild steel and AZ31 B magnesium alloy revealed that the joining methods for FSKSW joints is the main mechanical joining along with certain metallurgical bonding.

Electron beam welding of 304 stainless steel to QCr0.8 copper alloy with copper filler wire

Electron beam welding （EBW） of 304 stainless steel to QCr0.8 copper alloy with copper filler wire was carried out. Orthogonal experiment was performed to investigate the effects of process parameters on the tensile strength of the joints, and the process parameters were optimized. The optimum process parameters are as follows：beam current of 30 mA, welding speed of 100 mm/min, wire feed rate of 1 m/min and beam offset of-0.3 mm. The microstructures of the optimum joint were studied. The results indicate that the weld is mainly composed of dendriticαphase with little globularεphase, and copper inhomogeneity only occurs at the top of the fusion zone. In addition, a melted region without mixing exists near the weld junction of copper side. This region with a coarser grain size is the weakest section of the joints. It is found that the microhardness of the weld decreases with the increase of the copper content in solid solution. The highest tensile strength of the joint is 276 MPa.

A Convenient Synthesis of Trans and Cis-3, 4′, 5-trihydroxystilbene

Aim To synthesize trans and cis-3, 4′, 5-trihydroxystilbene by a new convenient route. Methods The reaction of 3, 5-dimethoxybenzaldehyde （3） and 4-methoxy phenylacetonitrile （4） formed the stilbene skeleton. After hydrolyzation, decarboxylation, and demethylation, we obtained trans-3, 4′, 5-trihydroxystilbene （resveratrol）, which can be converted to its cis-isomer by photochemical isomerization. Results Starting from 3 and 4, trans and cis-3, 4′, 5-trihydroxystilbene were synthesized, respectively. Conclusion A facile method for the synthesis of trans and cis-hydroxystilbenes from readily available materials was established.

体外受精-胚胎移植后异位妊娠45例分析

目的:探讨体外受精-胚胎移植(IVF-ET)后异位妊娠(EP)的高危因素。方法:对接受体外受精(IVF)、单精子卵胞浆内注射(ICSI)、冻融胚胎移植(FET)助孕后发生异位妊娠病例的助孕指征、助孕方式、异位妊娠类型等进行回顾分析。结果:1771新鲜助孕周期(IVF-ET,ICSI),417个冷冻周期(FET),1025个周期临床妊娠,其中宫内妊娠980个周期,妊娠成功率46.8%,异位妊娠45个周期(宫内宫外同时妊娠3个周期),异位妊娠发生率为2.06%:其中输卵管因素实施IVF-ET后发生异位妊娠37个周期,占82.22%。年龄、移植胚胎个数与本次助孕后异位妊娠的发生无关(P>0.05)。结论:IVF输卵管因素是异位妊娠发生的高危因素,移植管距宫底位置、取卵数、移植前内膜厚度与EP的发生有关。

Separation Properties of a New Polysiloxane-Anchored β-Cyclodextrin Derivative as Gas Chromatography Stationary Phase

A new capillary gas chromatography stationary phase, monokis (2,6 di O benzyl 3 O propyl (3’)) hexakis(2,6 di O benzyl 3 O methyl) β CD bonded polysiloxane, was synthesized. It exhibited separation abilities to disubstituted benzene isomers and some chiral solutes. It was also found that the polarity of CD derivatives can be lowered both by chemically bonding it to polysiloxane and by diluting it in polysiloxane. The separation abilities of the polysiloxane anchored CDs (SP CD) are higher than that of the unbonded CDs (S CD) and the diluted S CD at lower column temperature. Hydrosilylation reaction is one of the best methods to lower the operating temperature of CDs.

Microstructure and mechanical properties of dissimilar pure copper/1350 aluminum alloy butt joints by friction stir welding

The dissimilar friction stir welding of pure copper/1350 aluminum alloy sheet with a thickness of 3 mm was investigated. Most of the rotating pin was inserted into the aluminum alloy side through a pin-off technique, and sound welds were obtained at a rotation speed of 1000 r/min and a welding speed of 80 mm/min. Complicated microstructure was formed in the nugget, in which vortex-like pattern and lamella structure could be found. No intermetallic compounds were found in the nugget. The hardness distribution indicates that the hardness at the copper side of the nugget is higher than that at the aluminum alloy side, and the hardness at the bottom of the nugget is generally higher than that in other regions. The ultimate tensile strength and elongation of the dissimilar welds are 152 MPa and 6.3%, respectively. The fracture surface observation shows that the dissimilar joints fail with a ductile-brittle mixed fracture mode durin~ tensile test.

异种血清对猪血管内皮细胞适应模型的影响

目的:观察胎牛血清对PAEC适应模型的影响。方法:以猪自体血清原代培养PAEC并传代,接种于96孔板后分别以5%正常人血清(NHS组)、胎牛血清(FCS组)和补体灭活的胎牛血清(FCS+C组)诱导6d,加入25%正常人血清,以MTT比色法检测细胞的存活率,并以免疫组化的方法观察各组HO-1的表达情况。结果:NHS组和FCS+C组细胞存活率均升高,同对照组相比差异显著,两组间亦有差异,HO-1表达均增加。FCS组与对照组无差异。结论:质量不佳的胎牛血清或补体灭活不充分的胎牛血清会干扰PAEC适应模型的诱导。

Temporal-Spatial Variances of Holocene Precipitation at the Marginal Area of the East Asian Monsoon Influences from Pollen Evidence

The woodland-steppe ecotone in the. southern Nei Mongol Plateau is located at the northern edge of the east Asian monsoon influences. A marked southeastern - northwestern (SE - NW) precipitation gradient exists in this region. Quantitative reconstruction of palaeo-precipitation of this region is helpful to reveal the development of monsoon climate and to predict die future desertification. Based on modern vegetation and surface pollen studies, a pollen-precipitation transfer function in the study region was established. Pollen data from three sediment sequences within the ecotone were used to reconstruct palaeo-precipitation during the Holocene. The processes of precipitation changes in the three sequences were quite different. There was a tendency of precipitation declined from the onset of the Holocene to 1 100 a BP in Haoluku. But, in Liuzhouwan and Xiaoniuchang, both located south of Haoluku, the annual precipitation reached highest values during 7 800 - 6 200 a BP and 7 200 - 5 000 a BP, respectively. The influences of southwestern (SW) monsoon and the variances of topographical conditions have possibly caused these temporal-spatial variances.

异位妊娠危险因素的临床分析及预防对策

目的探讨引起异位妊娠的危险因素及预防对策。方法将收治的异位妊娠孕妇110例作为观察组,随机选择同期正常妊娠者110例作为对照组。比较两组在妇科炎症、宫内节育器、文化程度、紧急避孕药物应用、婚姻状况等方面上的差异。结果异位妊娠的危险因素为:妇科炎症史、带宫内节育器、文化程度低、应用紧急避孕药物、未婚等。结论异位妊娠与多种因素有关,应积极治疗妇科炎症,掌握IUD置放的适应证及禁忌证,选择安全有效避孕措施,对文化程度较低的人群妇科病普查普治,未婚女性加强保护意识。

Effect of finish-rolling conditions on mechanical properties and texture characteristics of AM50 alloy sheet

The conventional hot rolling of AM50 alloy at different roll temperatures and speeds was performed to investigate the effects of finish-rolling conditions on the mechanical properties and texture of rolled sheet. The better combination between strength（ultimate tensile strength： 295 MPa; yield strength： 224 MPa） and ductility（22.9%） can be obtained for the AM50 sheet rolled at the roll temperature of 200 °C with the roll speed of 5 m/min. The yield stress depends strongly on roll temperature, while the texture intensity in rolled sheets is more sensitive to roll speed during hot rolling. Increasing rolling temperature or roll speed can improve the mechanical anisotropy of AM50 rolled sheets.