NEW METHODOLOGY FOR THE ESTIMATION OF ENERGY CONSUMPTION IN A DOUBLE-TUBE-SOCKET (DTS (R)) PNEUMATIC CONVEYING

A new methodology based on the use of CFD is proposed to estimate the energy consumptions in a DTS (DOUBLE-TUBE-SOCKET) pneumatic conveying. A simple computational program based on this methodology is developed. It can directly give the lowest energy consumption and the compatible gas consumption by only input the distance of conveying and the conveying tonnage. This computational program has been validated through our experimental work.

R IBLL终端LA SCAR阵列探测器PM T高压控制系统的研制

介绍了R IBLL终端LA SCAR上PM T阵列电源高压控制系统。该系统以当今工程控制中常用的微型计算机作为核心器件,采用合适的外围电路达到了对PM T阵列稳定、可靠的控制,在现场测试中取得了良好的效果。

高离化态S~(q+)与H_2碰撞中H_2~(r+)的库仑爆炸及解离过程研究

采用位置灵敏探测器和散射离子 反冲离子飞行时间技术测量了 90 0keV的Sq + +H2 碰撞产生的H+ 碎片的能量分布 ,实验表明部分Hr+ 2 发生解离。基于蒙特卡罗方法 ,建立了程序模拟离子与分子碰撞中的反冲离子飞行时间谱。模拟结果与实验 (S2 + +H2 ,S2 + +He)测量到的TOF谱进行了分析比较 ,并进行了定性讨论。

Crossing the phantom divide in brane cosmology with curvature corrections and brane-bulk energy transfer

We consider the Randall-Sundrum brane-world model with bulk-brane energy transfer where the Einstein-Hilbert action is modified by curvature correction terms: a four-dimensional scalar curvature from induced gravity on the brane, and a five-dimensional Gauss-Bonnet curvature term. It is remarkable that these curvature terms will not change the dynamics of the brane universe at low energy. Parameterizing the energy transfer and taking the dark radiation term into account, we find that the phantom divide of the equation of state of effective dark energy could be crossed, without the need of any new dark energy components. Fitting the two most reliable and robust SNIa datasets, the 182 Gold dataset and the Supernova Legacy Survey (SNLS), our model indeed has a small tendency of phantom divide crossing for the Gold dataset, but not for the SNLS dataset. Furthermore, combining the recent detection of the SDSS baryon acoustic oscillations peak (BAO) with lower matter density parameter prior, we find that the SNLS dataset also mildly favors phantom divide crossing.

General SU(2)(L) x SU(2)(R) x U(1)(EM) sigma model with external sources, dynamical breaking and spontaneous vacuum symmetry breaking

We give a general SU(2)(L) x SU(2)(R) x U(1)(EM) sigma model with external sources, dynamical breaking and spontaneous vacuum symmetry breaking, and present the general formulation of the model. It is found that sigma and pi(0) without electric charges have electromagnetic interaction effects coming front the internal structures. A general Lorentz transformation relative to external sources J(gauge) - (J(A mu) J(A mu)(kappa)) derived, using the general Lorentz transformation and the four-dimensional current of nuclear matter of the ground si ate with J(gauge) = 0, we give the four-dimensional general relations between the different currents of nuclear matter systems with J(gauge) not equal 0 and those with J(gauge) = 0. The relation of the density's coupling with external magnetic field is derived, which conforms well to dense nuclear matter in a strong magnetic field. We show different condensed effects in strong interaction about fermions and antifermions, and give the concrete scalar and pseudoscalar condensed expressions of sigma(0) and pi(0) bosons. About different dynamical breaking and spontaneous vacuum symmetry breaking, the concrete expressions of different mass spectra are obtained in field theory. This paper acquires the running spontaneous vacuum breaking value sigma'(0), and obtains the spontaneous vacuum breaking in tenus of the running sigma'(0), which make nucleon, sigma, and pi particles gain effective masses. We achieve both the effect of external sources and nonvanishing value of the condensed scalar and pseudoscalar paticles. It is deduced that the masses of nucleons, sigma and pi generally depend on different external sources.

Fermionic zero modes in gauge and gravity backgrounds on T-2

Here we study fermionic zero modes in gauge and gravity backgrounds taking a two-dimensional compact manifold T-2 as extra dimensions. The result is that there exist massless Dirac fermions which have normalizable zero modes under quite general assumptions about these backgrounds on the bulk. Several special cases of gauge background on the torus are discussed and some simple fermionic zero modes axe obtained.

Ginsenoside R-e increases fertile and asthenozoospermic infertile human sperm motility by induction of nitric oxide synthase

We investigated the effects of Ginsenoside R-e on human sperm motility in fertile and asthenozoospermic infertile individuals in vitro and the mechanism by which the Ginsenosides play their roles. The semen samples were obtained from 10 fertile volunteers and 10 asthenozoospermic infertile patients. Spermatozoa were separated by Percoll and incubated with 0, 1, 10 or 100 mu M of Ginsenoside R-e. Total sperm motility and progressive motility were measured by computer-aided sperm analyzer (CASA). Nitric oxide synthase (NOS) activity was determined by the H-3-arginine to H-3-citrulline conversion assay, and the NOS protein was examined by the Western blot analysis. The production of sperm nitric oxide (NO) was detected using the Griess reaction. The results showed that Ginsenoside R-e significantly enhanced both fertile and infertile sperm motility, NOS activity and NO production in a concentration-dependent manner. Sodium nitroprusside (SNP, 100 nM), a NO donor, mimicked the effects of Ginsenoside R-e. And pretreatment with a NOS inhibitor N-omega-Nitro-L-arginine methyl ester (L-NAME, 100 mu M) or a NO scavenger N-Acetyl-L-cysteine (LNAC, 1 mM) completely blocked the effects of Ginsenoside R-e. Data suggested that Ginsenoside R-e is beneficial to sperm motility, and that induction of NOS to increase NO production may be involved in this benefit.

不同LET辐射对健康人血淋巴细胞和肿瘤细胞的损伤效应

目的: 探讨不同LET辐射对健康人外周血淋巴细胞的遗传损伤效应；了解重离子辐射诱导人血淋巴细胞染色体畸变的特点；研究用G2期染色体畸变预测肿瘤细胞辐射敏感性的可行性。材料与方法：采用兰州近代物理研究所重离子研究装置产生的12C离子和兰州大学第一附属医院放疗科提供的X射线照射健康人外周血，用常规染色体分析技术和姊妹染色体差别染色法研究不同LET辐射对健康人血淋巴细胞中期染色体的损伤效应、高LET辐射的剂量率效应、时程效应和染色体畸变的特点；用Calyculin A诱导间期染色体凝集技术研究12C 离子对淋巴细胞G2期染色体的损伤效应。用60Coγ射线照射人卵巢癌细胞和肝癌细胞，以细胞克隆存活率和G2期染色体畸变为生物学终点，探讨用G2期染色体畸变预测肿瘤细胞辐射敏感性的可行性。 结果与结论 1. 不同LET辐射诱导‘双+环’畸变与剂量之间存在良好的线性平方关系， 12C 离子诱导的畸变在细胞间的分布不符合泊松分布； 12C离子的相对生物学效应随着LET的增大而增大；12C离子诱导染色体畸变在1－5 Gy/min的范围内不存在剂量率效应；在0－4 Gy的剂量范围内不存在时程效应，说明培养48小时后中期‘双+环’畸变能很好的反应12C离子对淋巴细胞的损伤效应。本研究可以帮助人们了解重离子的相对生物学效应，为病人健康组织的保护以及放射医师的防护提供重要的理论数据。 2. LET为34.6 keV/μm的12C离子诱导淋巴细胞G2-期染色体数目畸变与剂量之间存在良好的线性关系(r=0.99)；最长G2-PCC与最短G2-PCC的长度之比与剂量之间存在良好的线性平方关系(r2=0.96)。表明有希望用G2-期染色体畸变评估重离子的相对生物学效应和估计重离子的辐射剂量，也为合理评估空间混合辐射场中重离子辐射所占比例提供了两个潜在的指标。 3. LET为34.6 keV/μm12C 离子诱导的畸变，除大部分染色体型畸变外，还出现少量的染色单体畸变，这一现象在理论上突破了传统的认识，对重离子辐射损伤机理的认识有重要意义。这可能是由于重离子特殊的离子径迹结构诱导染色单体畸变。重离子相对生物学效应是相对于常规射线而言的，而常规射线辐照G0期淋巴细胞只产生染色体型畸变，因此这一现象的存在对重离子相对生物学效应的确定提出了新的问题。 4. γ射线诱导肿瘤细胞G2期染色体初始断裂畸变和修复24小时后残余断裂畸变都与辐射剂量有良好的相关性；肿瘤细胞克隆存活率与G2染色单体初始断裂(r=0.96)和修复24小时后残余断裂(r=0.91)都有一定的相关性，比较而言，G2染色单体初始断裂畸变能更好的反映肿瘤细胞的辐射敏感性，预示G2染色单体初始断裂畸变有希望成为肿瘤细胞辐射敏感性的预测指标。 5. 2 Gyγ射线诱导的G2-染色单体断裂畸变，有近65% 的断裂在辐射后24小时内得以修复；对G2等点染色单体断裂畸变，在辐射后24小时内只有20%左右得以修复；两类畸变的修复主要发生在辐射后2小时内。 6. 在用G2-assay法测定染色体畸变的实验中，给予较高剂量时，很难获得足够的中期细胞以供观察。用G2-assay和G2-PCC技术获得的数据都与细胞克隆存活率有一定的相关性，比较而言，后者的相关性要好一些。表明G2-PCC技术可以作为细胞存活实验和用常规染色体畸变分析放射敏感性的替代方法

基于TM影像的表层土壤有机碳空间格局

土壤有机碳是土壤肥力的核心指标之一,理解其空间分布格局对促进精准农业的发展和科学施肥具有重要意义。本研究旨在检验TM影像结合地面采样数据分析黑龙江省黑土分布区表层土壤有机碳空间分布格局的可行性。结果表明:1)表层土壤有机碳浓度与TM5波段呈显著正相关(r=0.553,P<0.01),与TM4、TM5波段影像像素值之间满足二次多项式回归关系(R2=0.6791,P<0.05);2)回归模型对表层土壤有机碳空间分布格局具有较好的预测效果(R2=0.7097,P<0.05);3)海拔高于200m的地区表层土壤有机碳浓度显著高于海拔低于200m的地区(P<0.05)。

以转座子Tn5作弗氏中华根瘤菌的可识别生态学标记的研究──Tn5的水平转移及其对R．frediiTn5突变株运动的影响

将一株弗氏中华根瘤菌（Ｒ．ｆｒｅｄｉｉ）ＱＢ１１３０的Ｔｎ５插入突变株ＯＮ－２用于生态学研究，以评估Ｔｎ５在自然环境中的水平转移以及各种水势下Ｔｎ５对突变株ＯＮ－２在土壤中运动的影响．试验表明，在自然潮湿的土壤中，Ｔｎ５本身的水平转移频率很低，且与Ｔｎ５插入相关的突变株卡那霉素抗性表型标记在非选择性平板上连续传４０代后仍然稳定．突变株ＯＮ－２与相对应的野生型菌株ＱＢ１１３０在各种相同水势的土壤中的运动无明显差异（Ｐ＝０．０１），表明Ｔｎ５的插入不影响突变株的运动．因此，Ｔｎ５可作为研究Ｒ．ｆｒｅｄｉｉ基因工程菌大回应用的一个稳定有效的生态学标记．

Investigation of Chemical Bond Characteristics, Thermal Expansion Coefficients and Bulk Moduli of alpha-R2MoO6 and R2Mo2O7 (R = rare earths) by Using a Dielectric Chemical Bond Method

Theoretical researches are performed on the alpha-R2MoO6 (R = Y, Gd, Tb Dy, Ho, Er, Tm and Yb) and pyrochlore-type R2Mo2O7 (R = Y, Nd, Sm, Gd, Tb and Dy) rare earth molybdates by using chemical bond theory of dielectric description. The chemical bonding characteristics and their relationship with thermal expansion property and compressibility are explored. The calculated values of linear thermal expansion coefficient (LTEC) and bulk modulus agree well with the available experimental values. The calculations reveal that the LTECs and the bulk moduli do have linear relationship with the ionic radii of the lanthanides: the LTEC decreases from 6.80 to 6.62 10(-6)/K and the bulk modulus increases from 141 to 154 GPa when R goes in the order Gd, Tb Dy, Ho, Er, Tm, and Yb in the alpha-R2MoO6 series; while in the R2Mo2O7 series, the LTEC ranges from 6.80 to 6.61 10(-6)/K and the bulk modulus ranges from 147 to 163 GPa when R varies in the order Nd, Sm, Gd, Tb and Dy.

Bonding Characteristics, Thermal Expansibility, and Compressibility of RXO4 (R = Rare Earths, X = P, As) within Monazite and Zircon Structures

Systematically theoretical research was performed on the monazite- and zircon-structure RXO4 (R = Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; X = P, As) series by using the chemical bond theory of dielectric description. The chemical bond properties of R-O and X-O bonds were presented. In the zircon phase, the covalency fractions of X-O bonds increased in the order of V-O < As-O < P-O, which was in accordance with the ionic radii and electronegative trends, and the covalency fractions of R-O bonds varied slightly due to the lanthanide contraction. While in the monazite phase, both R-O and X-O bonds were divided into two groups by their covalency fractions.