Quantum critical phenomena in the XY spin chain with the Dzyaloshinski-Moriya interaction (Retracted article. See vol 80, artn 019903, 2009)

We study the effects of the Dzyaloshinski-Moriya (DM) anisotropic interaction on the ground-state properties of the Heisenberg XY spin chain by means of the fidelity susceptibility, order parameter, and entanglement entropy. Our results show that the DM interaction could influence the distribution of the regions of quantum phase transitions and cause different critical regions in the XY spin model. Meanwhile, the DM interaction has effective influence on the degree of entanglement of the system and could be used to increase the entanglement of the spin system.

Disentangling geomagnetic and precipitation signals in an 80-Kyr Chinese loess record of Be-10

IEECAS SKLLQG

利用深部非弹反应对Z≈56,N≈80区核激发态的探索性研究

通过 4 1 0MeV82 Se轰击天然Ba靶引起的深部非弹反应布居产生了类弹和类靶余核的激发态 ,利用在束γ谱学方法测量了它们的退激γ .通过γ -γ符合测量估计了类弹、类靶余核激发态的产生截面 ,在多个类靶余核中观测到了新γ跃迁 ,并建立了136 Ba的新能级纲图 ,说明利用深部非弹反应研究Z≈ 56,N≈ 80区高自旋态是有效、可行的

Effect of 80.55 MeV/u(12)C(6+) ions on radiosensitivity and cell cycle of human hepatoma cell lines

In this paper, the relationship between radiosensitivity, cell cycle alteration and the change of apoptosis in different human hepatoma cell lines irradiated by heavy ions were studied with the aim of building up the base data for clinical therapy. Exponentially growing hepatoma cell lines were irradiated by 80.55 MeV/u(12)C(6+) ions at a dose of 0 Gy, 0.5 Gy, 1 Gy, 2 Gy, 4 Gy and 8 Gy. The radiosensitivity was assessed by means of the colony-forming assay. The DNA content, the percentage of each cell-cycle phase and the apoptosis rate were obtained with flow cytometry methods. After the irradiation, the SF2 (survival fraction at 2 gray) of SMMC-7721 cells were evidently lower than that of HepG2 cells. The S phase arrest, G2/M phase arrest delay and the apoptosis in the two hepatoma cell lines varied with the increase of the dose and repair time. The heavy ions could obviously kill the human hepatoma cell lines. Compared to HepG2 cells, SMMC-7721 cells were more radiosensitive to C-12(6+) ions.

80 MeV/u C-12离子诱变选育PHB高产菌株；A strain of high PHB output by mutagenesis of 80 MeV/u C-12 ions

用80MeV/u12C6+离子对一株积累聚β-羟基丁酸酯(PHB)的芽孢杆菌(BacillusP-9)进行诱变选育,最终获得PHB高产株菌G15,其PHB产量达2.93g/L,与出发菌株相比较,PHB积累量提高了1.5倍。研究结果表明,本试验辐照最佳剂量为15Gy。重离子辐照诱变育种效果显著,具有广阔的发展应用前景。

80keV N离子注入对ZnO薄膜结构的影响；Effects of 80 keV N-ion Implantation on Structures of ZnO Films

室温下用80keVN离子注入ZnO薄膜样品,注量分别为5.01014,5.01015和5.01016ions/cm2,然后用X射线衍射和透射电镜技术对样品的结构特性进行了表征。实验结果表明,由高度(002)择优取向的致密柱状晶构成的薄膜中,注入5.0×1015ions/cm2时,观测到缺陷生成和局域无序化现象,但薄膜总体结构仍保持柱状晶和(002)择优取向;随着注量的增大,晶格常数c和压应力呈增大趋势。对注入N离子对ZnO薄膜结构特性的影响机理进行了简单的讨论。

TW-80对污染土壤中菲和芘的生物降解影响

以 Ｔ Ｗ８０ 为供试物，进行了表面活性剂对污染土壤中菲和芘生物降解影响研究． 实验周期１５０ ｄ ．并分别在３０ ｄ 、６０ ｄ 和１５０ ｄ 间隔采样监测菲、芘降解率．结果表明，３０ ｄ 后，加入 Ｔ Ｗ８０ 的不同处理土壤中，菲的降解率分别达８１ ％ ～９８ ．９ ％ ，比 Ｃ Ｋ 高２２ ．０２ ％ 以上、芘的降解率分别达７１ ．９０ ％ ～８０ ．６６ ％ ，比 Ｃ Ｋ 高９ ．４６ ％ 以上．６０ ｄ 后，加入 Ｔ Ｗ８０ 的处理中，菲的降解率达８８ ．９４ ％ ～９６ ．５１ ％ 、比 Ｃ Ｋ 高１１ ．１４ ％ 以上； 芘降解率达９２ ．３９ ％～９４ ．０２ ％ ，比 Ｃ Ｋ 高２ ．２７ ％ 以上．１５０ ｄ 后，所有处理中，菲和芘的降解率均分别达到９８ ％ 和９６ ％ 以上， 与 Ｃ Ｋ 无明显差别．研究还发现， Ｔ Ｗ８０ 土壤中含有优势真菌常见青霉、蠕形青霉、淡紫青霉和顶孢头孢霉．它们可能是促进土壤中菲、芘降解的原因

表面活性剂TW-80对土壤中多环芳烃生物降解的影响

以表面活性剂ＴＷ８０为供试物，进行了为期１５０ｄ的实验研究，并分别在３０、６０和１５０ｄ间隔采样监测ＰＡＨｓ降解率．结果表明，３０ｄ后，土壤中ＰＡＨｓ的降解率达９０％，比对照提高约３０％．６０ｄ后，浓度为１００００ｍｇ·ｋｇ－１表面活性剂的土壤和对照中，ＰＡＨｓ降解率从６５．１％和６０％迅速提高到９３．８％和７９．２％．其它处理中，ＰＡＨｓ的平均降解率仅比３０ｄ的结果提高４％．１５０ｄ后，所有处理中ＰＡＨｓ的降解率均达到９０％以上．可以认为，表面活性剂能提高ＰＡＨｓ的生物可利用性，加快ＰＡＨｓ的降解速率，从而减少污染暴露时间．但表面活性剂浓度过高可抑制微生物活性．研究还发现，ＴＷ８０土壤中含有优势真菌．经鉴定为常见青霉、蠕形青霉、淡紫青霉和顶孢头孢霉．它们是土壤ＰＡＨｓ迅速降解的动因

表面活性剂吐温-80对菲和芘生物降解的影响

表面活性剂吐温－８０对菲和芘生物降解的影响宋玉芳赵燕杨桂芬（中国科学院沈阳应用生态研究所，沈阳１１００１５）我们通过室内模拟实验方法选择了表面活性剂吐温－８０，研究其生物毒性及对菲，芘微生物活性和微生物降解的影响，土壤呼吸强度实验结果表明，当吐温－８...

Gas phase derivatization of endohedral metallofullerenes R@C-82 and R-2@C-80 (R = Nd, Ce)

Endohedral metallofullerenes Ce@C-82, Ce-2@C-80, Nd@C-82 and Nd-2@C-80 undergo gas phase ion/molecule reactions with the ion system from self-chemical ionization of vinyl acetate, and exohedral derivatives are thus generated, A new heterocycle is formed from metallofullerenes and a C2H3O+ cation, Endohedral metallofullerenes show much higher reactivities than empty fullerenes during the association and the charge and proton transfer processes, The strong electron-donating character of endohedral metallofullerenes is due to their unique super-atom-like electronic structures. (C) 1997 by John Wiley & Sons, Ltd.