石榴干腐病生物生态学及发生流行规律和治理研究

云南蒙自石榴干腐病助故阮以菌丝体和分生抢子在僵果、干 腐果及其他感病部位越冬。翌年经风雨、昆虫和人为活动在果园广为传播。石榴 花、幼果、果实期均可感病发病, 等筒花丝最易感病。果实发病率达一, 重者达一。采取综合治理措施, 其中重要的是在首次连续降雨前利去干 花丝、套袋和树冠多次喷清水, 提前水解、淡化干花丝、伤口渗出液的微酸性度, 可 控制该病的发生危害, 危害率由原来的一现降为一。

沉淀剂YNB99—1在肝素钠精制中的应用

在pH 3．0时，去除85和95～105 USP u／mg粗品肝素钠的杂蛋白分别使用 0．05％和0．03％的YNB 99一l。120 USP u／mg以上的粗品在pH中性下直接使用0．05％ 的YNB 99—1即可。在氧化精制中，加入0．005％的YNB 99—1可使HzOz用量减少至 1．5％，氧化时间缩短至12 h。精品效价170 USP u／mg以上，产品收率90％以上。

武汉市饮用水中浮游藻类的调查

目的了解武汉市饮用水中浮游藻类的污染情况。方法分别于1999-2001年春、夏、秋、冬对武汉市不同水源供水区末梢水和同一地点水箱水进行4次采样,进行藻类形态学检测。结果生活饮用水中浮游藻类有蓝藻门(Cyanophyta)、隐藻门(Cryptohyta)、金藻门(Chrysophyta)、硅藻门(Bacillariophyta)、裸藻门(Euglenophyta)、绿藻门(Chlorophyta)等6个门,56个属、97个种藻类(其中67个鉴定到种,30个鉴定到属)。城市末梢水中浮游藻类检出为89%,饮水水

长吻和异育银鲫对玉米淀粉利用差异的比较研究

在同一实验条件下,通过8周生长实验比较研究了不同玉米淀粉含量的饲料对长吻和异育银鲫生长、饲料利用和鱼体组成的影响,以探讨肉食性和杂食性鱼类对玉米淀粉利用的差异。长吻的实验饲料是5种等氮等脂、玉米淀粉含量分别为0、5%、10%、15%和20%的半精制饲料。异育银鲫的实验饲料是5种等氮等脂、玉米淀粉含量分别为6%、12%、18%、24%和30%的半精制饲料。每天饱食投喂鱼两次。实验结果表明:对于长吻,玉米淀粉含量为5%和10%饲料组的特定生长率显著高于另外3组(Duncan s多重比较,P<0.05)。

Improving photosynthesis of microalgae by changing the ratio of light-harvesting pigments

Changing the ratio of light-harvesting pigments was regarded as an efficient way to improve the photosynthesis rate in microalgae, but the underlying mechanism is still unclear. In the present study, a mutant of Anabeana simensis (called SP) was selected from retrieved satellite cultures. Several parameters related with photosynthesis, such as the growth, photosynthesis rate, the content of photosynthetic pigment, low temperature fluorescence spectrum (77K) and electron transport rate, were compared with those of the wild type. It was found that the change in the ratio of light-harvesting pigments in the mutant led to more efficient light energy transfer and usage in mutant than in the wild type. This may be the reason why the mutant had higher photosynthesis and growth rates.

Study on optical properties of Er/Er+O doped GaN thin films

We extend the use of Raman spectroscopy to investigate the modes of Er-implanted and Er + O co-implanted GaN, and discuss the influence of O ions on Er3+ -related infrared photoluminescence (PL). It is found that Er3+ implantation introduces new Raman peaks in Raman spectra at frequencies 300 and 670 cm and one additional new peak at 360cm is introduced after Er + O implantation. It is proposed that the broad structure around 300 cm(-1) mode originates from disorder-activated scattering (DARS). The Raman peak at 670 cm is assigned to nitrogen vacancy related defects. The 360 cm peak is attributed to the O implantation induced defect complexes (vacancies, interstitial, or anti-sites in the host). The appearance of the 360 cm(-1) mode results in the decrease of the Er3+ -related infrared PL of GaN: Er + O.

一种面向异构实时集群系统的使用率反馈控制方法

软实时系统有着广泛的应用,如在线游戏、股票交易、传感器网络数据处理等.在这类应用中,通常有多个服务节点来响应外界大量的软实时请求.为了保证服务质量及防止系统超载,这些节点的CPU需要满足一定的使用率限制.为此,首先提出了异构集群系统中基于负载平衡的CPU使用率动态模型,其次在算法设计上将反馈控制理论引入其中并提出了针对异构实时集群系统的基于反馈的使用率控制算法.实验结果证明,该算法在引入负载平衡机制的异构实时集群系统中运行良好,系统节点间负载均衡并且各节点的CPU使用率能稳定地运行在限定状态.

掺Er/Er+O的GaN薄膜光学性质的研究

利用Raman散射谱研究了GaN注Er以及Er+O共注样品的振动模，并讨论了共注入O对Er离子发光的影响. 在Raman散射谱中，对于注Er的GaN样品出现了300 cm~(-1)和670 cm~(-1)两个新的Raman峰，而对于Er+O共注样品，除了上述两个峰外，在360 cm~(-1)处出现了另外一个新的峰，其中300 cm~(-1)峰可以用disorder-activated Raman scattering (DARS)来解释，670 cm~(-1)峰是由于与N空位相关的缺陷引起的，而360 cm~(-1)峰是由O注入引起的缺陷络合物产生的. 由于360 cm~(-1)模的缺陷出现，从而导致Er+O共注入GaN薄膜红外光致发光(PL)强度的下降

Preparation and characterization of erbium doped sol-gel silica glasses

Erbium-doped silica glasses were made by sol-gel process. Intensive photoluminescence (PL) spectra from the Er-doped silica glasses at room temperature were measured. A broadband peak at 1535 ma, corresponding to the I-4(13/2)-I-4(15/2) transition, its full width at half-maximum (FWHM) of 10 nm, and a shoulder at 1546 nm in the PL spectra were observed. At lower temperatures, main line of 1535 nm and another line of 1552 Mn instead of 1546 nm appear. So two types of luminescence centers must exist in the samples at different temperature. The intensity of main line does not decrease obviously with increasing temperature. By varying the Er ion concentration in the range of 0.2 wt% - 5wt%, the highest photoluminescence intensity was obtained at 0.2wt% erbium doped concentration. Luminescence intensity decreases with increasing erbium concentration. Cooperative upconversion was used to explain the concentration quenching of luminescence from silica glass with high erbium concentration. Extended X-ray absorption fine structure measurements were carried out. It was found that the majority of the erbium impurities in the glasses have a local structure of eight first neighbor oxygen atoms at a mean distance of 0.255 nm, which is consistent with the typical coordination structure of rare earth ion.