南海海绵Dysidea fragilis中两个倍半萜内酯的NMR研究

用一维¹H、¹³C NMR谱、DEPT ¹³C NMR谱、选择性远程DEPT ¹³C NMR、¹H-¹H COSY和¹³C-¹H COSY二维核磁共振技术研究了南海海绵Dysidea fragilis中的两个倍半萜herbadysidolide(1)和furodysinin lactone(2),确认了化学结构,并对其¹³C NMR和¹H NMR谱进行了归属.药理活性试验表明:1和2具有一定的心血管活性.     

罗汉果甙V的核磁共振谱研究

用一维¹H、¹³CNNMR,二维¹H-¹H COSY、¹³C-¹H COSY和NOE差谱技术研究了从鲜罗汉果中分离出一种含5个葡萄糖的三萜甙、罗汉果甙V,确定了其甙元与糖基、糖基与糖基之间的连接方式,并首次对其¹H和¹³C NMR谱中的全部信号进行了归属。     

二维核磁共振鉴定吕宋果内酯的结构

本文利用J-分解、¹H-¹H COSY、¹³C-¹H COSY等二维核磁共振技术对吕宋果内酯的¹H和¹³C谱线进行了归属,并进而确定了它的立体结构。     

天然结晶辣椒碱的NMR谱研究

用一维¹H NMR谱、¹H-¹H COSY谱和一维¹³C NMR谱、DEPT谱研究辣椒碱分子和二氢辣椒碱分子及其混合物,得到¹H和¹³C的化学位移,采用¹H NMR谱测定天然辣椒碱中辣椒碱和二氢辣椒碱的相对含量.     

南蛇藤中倍半萜生物碱的二维NMR研究

用DEPT和二维NMR技术包括:¹H-¹H COSY,¹H-¹³C COSY,NOESY,特别是¹H-¹³C COLOC对两个多酯基取代的倍半萜生物碱的化学及立体结构进行了研究,并对其¹H和¹³C NMR谱峰进行了归属。     

群柱内酯萜二维核磁共振谱的研究

本文研究了群柱内酯萜(Ⅰ)的二维¹H同核COSY、C-H COSY、远距C-H COSY谱,根据这些信息和经验规律归属了(Ⅰ)的¹H及¹³C谱峰,二维远距C-H COSY提供了相隔两、三个键的C-H偶合信息,因此,在很多方面可以代替灵敏度很低的INADEQUATE技术,得到C-C联结的信息。     

关附庚素的选择性远程DEPT、一维COSY和一维接力COSY谱的研究

由于谱峰拥挤和重迭、关附庚素的一部分¹H和¹³C谱峰用一般核磁共振方法难于确定归属。本工作采用选择性远程DEPT、一维COSY和-维接力COSY等新技术作了研究,其¹H和¹³C谱峰归属全部得到确定。结果有助于此类化合物的化学结构测定。     

聚芴衍生物中间体的合成与NMR分析

通过Suzuki偶联聚合反应得到D-A-D型聚芴衍生物的关键中间体2,7-二（4,4,5,5-四甲基-1,3,2-二氧杂硼烷-2-基）-9,9-二辛基芴. 应用一维和二维核磁共振技术（¹H NMR,¹³C NMR,DEPT,¹H-¹H COSY,HMQC,HMBC）对该化合物进行了结构表征,准确归属了它们的¹H,¹³C信号,为其结构鉴定提供了重要依据.     

盐酸马尼地平的核磁共振数据解析

盐酸马尼地平是第三代合成降压新药．本文利用一维、二维核磁共振（NMR）技术,包括¹H NMR、¹³C NMR DEPT-135、¹H-¹H NOESY、¹H-¹H COSY、¹H-¹³C HSQC和¹H-¹³C HMBC,对其¹H和¹³C NMR信号进行了全归属,进一步确证了其分子结构．同时,对其¹H NMR和¹³C NMR谱中一些异常信号进行了讨论．     

3'(,3")-(二)甲酰基(二)苯并冠醚的2D NMR研究

测定了3'(,3")-(二)甲酰基(二)苯并冠醚(1~7)的¹H、¹³C谱,首次结合¹H-¹H COSY、¹³C-¹H COSY、COLOC二维谱对这些化合物的¹H、¹³C化学位移进行了归属。用NOESY谱确定了合成产物冠4、冠5的结构,并对溶液中的构象异构体及其溶剂影响进行了初探。作者以冠1~8的¹H、¹³C谱的归属为参照,提出了正确归属冠醚醚环上次甲基¹H、¹³C化学位移的一般规则。     

High frequency acceleration system of the DC-280 cyclotron

The radio-frequency (RF) accelerating system designed at the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research (FLNR JINR), for the DC-280 cyclotron is described. The cyclotron is intended to increase the capabilities and efficiency of experiments on the synthesis of superheavy elements and investigate their nuclear-physical and chemical properties. The DC-280 isochronous heavyion cyclotron will produce an accelerated beam of ions in the range from neon to uranium. The results of the preliminary and 3D numerical calculations of the main cavity of this system are reported. The preliminary calculations by the Coaxresonator software have allowed the geometry of the main cavity to be chosen. 3D numerical simulation has completely confirmed the correctness of the preliminary calculations. For example, the difference in frequency between the preliminary and 3D numerical calculations is no larger than 1%. The electric-field component maps obtained from the simulations are used to calculate the beam dynamics in the cyclotron.     

Flat-top system of the DC-280 cyclotron

The flat-top cavity of the radio-frequency accelerating system designed at the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, for the DC-280 cyclotron is described. The cyclotron is intended for increasing the capabilities and efficiency of experiments on the synthesis of super-heavy elements and an investigation of their nuclear physical and chemical properties. The DC-280 isochronous heavy-ion cyclotron will produce accelerated beam of ions in the range from neon to uranium. The parameters, design, and results of the experimental and 3D computer modeling of the flat-top cavity of the RF accelerating system of the DC-280 cyclotron are reported.     

一种环烯醚萜甙（8—O—acetyl—shanzhiside methylester）的2D NMR

利用二维核磁共振技术对从独一味植物中分离的的环烯醚萜甙化合物进行了＾１Ｈ和＾１３Ｃ ＮＭＲ的归属，并确定其糖与甙的接点。     

Magnet design and beam dynamics in computed fields for the DC-350 cyclotron

The DC-350 is an isochronous cyclotron designed in the Flerov Laboratory of Nuclear Reaction (FLNR). It is intended for accelerating ions with a mass-to-charge ratio A/Z within an interval of 5–10 and with an energy of 3–12 MeV/u at the extraction radius. These ion beams will be used in nuclear and applied physics experiments. The paper describes the results of a 3D magnet simulation. The cyclotron magnet and IM90 analiziting-bend magnet of the axial injection channel are studied here. The influence of correction coils on the cyclotron magnet is calculated. All magnet fields were calculated by MERMAID 3D code [1]. The text was submitted by the authors in English.     

20(R)和20(S)-人参皂甙Rg_2碳氢NMR信号全指定

20 (R)和 2 0 (S) 人参皂甙 Rg2 属于达玛烷型四环三萜类化合物 .应用 2DNMR技术 :1 H 1 HCOSY、HMQC和HMBC全归属 2 0 (R)和 2 0 (S) 人参皂甙 Rg2 碳和氢质子信号 ,为该类型化合物的结构鉴定提供波谱学依据 .     

DC-60 heavy ion cyclotron complex: The first beams and project parameters

The construction of the DC-60 Heavy Ion Cyclotron for the Interdisciplinary Scientific Research Complex (ISRC) in Astana started in early 2004. The cyclotron was manufactured and tested at the Flerov Laboratory of Nuclear Reactions (FLNR) in Dubna. The main units were delivered to Astana and assembled in the ISRC building in the summer of 2006. The cyclotron was turned on in September, 2006. The first heavy ion beams in the whole A/Z and energy ranges were accelerated and extracted in December, 2006. The complex, based on the DC-60 cyclotron, is intended for applied and fundamental research using accelerated heavy ion beams ranging from Carbon to Xenon with energies in the range of 0.34–1.77 MeV/nucleon, as well as for experiments on the channel of low energy ion beams, where the ion extraction voltage supplied by the ECR source reaches 25 kV. The energy variation of the accelerated ions is accomplished by changing the ion charge. The possibility of smoothly tuning the ion energy by ±30% of its nominal value can be seen by changing the cyclotron magnetic field. Within the framework of commissioning the DC-60 cyclotron, a number of experiments were carried out with accelerating charged particle beams in the main points of the working diagram

20(R)和20(S)-人参皂甙Rg2碳氢NMR信号全指定

20(R)和20(S)人参皂甙Rg₂属于达玛烷型四环三萜类化合物.应用2DNMR技术:¹H-¹H COSY、HMQC和HMBC全归属20(R)和20(S)人参皂甙Rg₂碳和氢质子信号,为该类型化合物的结构鉴定提供波谱学依据.     

Development,creation, and startup of the DC-110 heavy ion cyclotron complex for industrial production of track membranes

The DC-110 heavy ion cyclotron for industrial production of track membranes has been developed and created at the Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research. The cyclotron is equipped with an electron cyclotron resonance ion source operating at a frequency of 18 GHz. The accelerator complex was put into operation in 2012 and ⁴⁰Ar⁶⁺, ⁸⁶Kr¹³⁺, and ¹³²Xe²⁰⁺ ion beams with a energy of 2.5 MeV/nucleon and intensity of 13, 14.5, and 10.5 μA, respectively, were produced. Irradiation of a polymer film was carried out on a specialized channel and track membranes with a high uniformity of pores were obtained. The DC-110 accelerator complex can produce up to 2 million square meters of track membranes per year.     

Cl+HN3产生NCl(a1Δ)和NCl(b1∑)的实验研究

 对利用微波放电直接解离Cl₂生成Cl, Cl与HN₃反应生成NCl(a^1Δ )和NCl(b^1∑)的过程进行了实验研究。得到了较强的NCl(a^1Δ 和NCl(b^1∑)自发辐射光谱,考察了Cl₂流量和He/Cl₂配比对NCl(a^1Δ 和NCl(b^1∑)生成的影响。发现对于一定的He流量,Cl₂流量对NCl(a^1Δ 和NCl(b^1∑)生成的影响存在一最佳范围,而最佳He/Cl₂配比不是一定值,而是随He流量升高而变大,在实验所考察的He流量范围（5~40 L/min）内,最佳He/Cl ₂配比在30∶1~100∶1之间。