盐碱胁迫下紫花苜蓿的生理学及解剖学特征比较

以紫花苜蓿“中苜一号”为材料,分别比较了盐碱不同胁迫下紫花苜蓿光合参数、叶绿素和MDA的质量分数以及表皮解剖学特征。结果发现盐碱胁迫下,光合参数、叶绿素的质量分数、气孔开度都下降,而且碱胁迫下的下降程度高于盐胁迫,说明碱胁迫对紫花苜蓿的伤害强于盐胁迫。     

蒙古国焦煤优化配用技术研究

对蒙古国焦煤进行煤质检验及配用试验,分析了焦炭的显微结构,结果表明,蒙古国焦煤变质程度偏低(介于1/3焦煤和焦煤之间),G值、Y值和膨胀度较高,塑性温度区间窄,成焦显微结构特征类似于1/3焦煤。用蒙古国焦煤完全替代优质焦煤,焦炭质量有所下降;而采用蒙古国焦煤部分替代焦煤和1/3焦煤可以稳定焦炭质量。     

黏结指数G值表征炼焦煤结焦性的局限性研究

对7组相同变质程度和黏结指数G值炼焦煤煤岩显微组分、高温塑性和成焦光学组织结构进行研究。结果表明,相同变质程度和G值的炼焦煤高温塑性差异明显,软化温度相差3~29℃,固-软温度区间相差8~42℃,最大基氏流动度比值为1.3~1266;其炼焦煤焦炭光学组织结构差异亦明显,粗粒镶嵌结构占比相差9%~43%,同性结构占比相差2%~16%,纤维结构占比相差15%~36%。因此,G值对煤料受热所产生胶质体的数量能较好地表征,但对其结焦性的判断存在缺陷。     

炼钢-连铸过程生产计划与调度问题综合优化研究

生产计划与调度是炼钢厂生产管理与控制的重要环节。对特殊钢厂炼钢-连铸过程的生产计划与调度问题进行述评,对国内外其研究现状进行分析,并指出了其生产计划与调度结构的发展趋势。结果表明,合理的生产计划与调度方案,是特殊钢厂实现高品质、高效生产的重要途径,亦可对其全过程进行高效协调与管理,从而降低能耗和冶炼成本。     

Assembly of isoquinolines via CuI-catalyzed coupling of beta-keto esters and 2-halobenzylamines

CuI-catalyzed coupling of 2-halobenzylamines with beta-keto esters or 1,3-diketones in i-PrOH under the action of K(2)CO(3) produced 1,2-dihydroisoquinolines as the coupling/condensative cyclization products, which underwent smooth dehydrogenation under air atmosphere to afford substituted isoquinolines.     

Hypothesis of active components in volatile oil from a Chinese herb formulation, 'Shao-Fu-Zhu-Yu decoction', using GC-MS and chemometrics

Traditional Chinese medicine (TCM) with few or no side effects has increasingly attracted attention all over the world. However, the bioactive components and the therapeutic mechanisms are usually not understood because of the complex chemical compositions of these medicines. In this paper, GC-MS coupled with a chemometric method was developed for analysis of active components in volatile oil from a Chinese herb formulation, "Shao-Fu-Zhu-Yu Decoction". The volatile oils, obtained by hydrodistillation from "Shao-Fu-Zhu-Yu Decoction" (SFZYD) and its constituent herbs with abundant volatile oil (Angelica sinensis, Ligusticum chuanxiong, Cinnamomum cassia, Foeniculum vulgare, Zingiber officinale), were chemically analyzed using GC-MS and bioassayed using oxytocin-induced uterine contraction assay in vitro. Then, a mathematic model relating the chemical compositions and their activities in inhibiting mice uterine contraction was established for hypothesis of the bioactive compounds based on chemometrics. As a result, nine compounds which might contribute to the inhibition of oxytocin-induced uterine contraction were selected, and the activities of some of them were further confirmed by our experiments and/or the literature. The data suggest that the developed method is helpful for screening bioactive components from complex mixtures, such as the extracts of TCM.     

Synthesis and fungicidal activity of novel 3,5-diarylpyrazole derivatives

(E)-3-(2-chlorophenyl)-1-(2,4-dichlorophenyl) prop-2-en-1-one was prepared from 2-chlorobenzaldehyde followed by cyclization with hydrazine monohydrate. Eight new 3-(2,4-Di-chlorophenyl)-5-(2-chlorophenyl)-4,5-dihydro-N-acylpyrazole derivatives were synthesized and characterized by elemental analysis, IR and ¹H NMR spectroscopy. The experimental results show that the inhibition ratio of compounds 3f towards H. Oryzae and P. oryzae at 50 mg·L⁻¹ is 55.2% and 57.1%, respectively. The inhibition ratio of compounds 3g towards H. Oryzae, P. oryza, S. Sclerotiorum at 50 mg·L⁻¹ is 53.3%, 60.0%, 50.4% respectively. __________ Translated from Chinese Journal of Applied Chemistry, 2007, 27(7): 835–837     

On meromorphic solutions of f 3 + g 3 = 1

We show that meromorphic solutions f, g of f ³ + g ³ = 1 in must be constant, if and have the same zeros (counting multiplicities). Received: 12 March 2007     

An organic p-type dopant with high thermal stability for an organic semiconductor

To overcome the thermal instability of a p-doped organic hole transporting layer using the state-of-the-art p-type dopant, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, a potent electron accepter, 3,6-difluoro-2,5,7,7,8,8-hexacyanoquinodimethane, has been found to possess superior thermal stability and proved to be an excellent p-type dopant.     

Effect of swift heavy ions in Ni-Al nanocrystalline films studied by X-ray absorption spectroscopy

X-ray absorption spectroscopic measurements have been used to compare the electronic structures of swift heavy ions (100 MeV Si ions) irradiated and pristine Ni-Al nanocrystalline films. Results from X-ray diffraction (XRD), X-ray absorption near-edge structure (XANES) spectra at Al K-, and Ni L(2,3)-edges and extended X-ray absorption fine structure (EXAFS) at Ni K-edges are discussed. The observed XRD peaks indicate the improvement of crystalline nature and Al(111) clustering after the swift heavy ion interactions. While the XANES spectra at Ni L(2,3)-edges show decrease in the intensity of white line strength, the Al K-edge shows increase in intensity after irradiation. Above results imply that swift heavy ions induce low Z (i.e., Al) ion mass transport, changes in Al sp-Ni-d hybridization, and charge transfer. EXAFS results show that crystalline nature is improved after swift heavy irradiation which is consistent with XRD results.