葡萄酒泥农业应用效果研究

酿酒葡萄酒泥经发酵后制成有机或有机无机复混肥,以底肥或追肥方式施用于大田作物(鲜食玉米)及果树(桃、冬枣)上,结果显示:在等养分含量下,酒泥施用效果明显优于一般复合肥(对照),鲜食玉米单穗重平均增加35g,增重率24.3%,双穗率比对照高16个百分点,且穗长、穗粗等项指标均优于对照;冬枣单果平均增重4.32g,增重率为30.62%,可溶性糖增加2.96个百分点;桃可溶性糖提高1.53个百分点,Vc增加10.7%。酒泥中不含有任何对人类身体有毒有害物质,是很好的绿色有机肥源。     

郁金香促成栽培技术要点

郁金香(Tulipa gesneriema),百合科郁金香属,多年生球茎类草本花卉,是世界上有名的切花及花坛、花镜素材.花姿雅容典雅,芳香淳朴,深受人们的喜爱.     

节能日光温室草莓促成栽培技术

草莓为宿根性多年生常绿草本植物.适应性强,具有结果早、周期短、繁殖迅速、管理方便、见效快、成本低廉等优点,是一种投资小,收益高的经济作物.     

Spatial pattern formation in an insect host-parasitoid system

Spatial models in ecology predict that populations may form patchy distributions within continuous habitats, through strong predator-prey or host-parasitoid interactions combined with limited dispersal. Empirical support of these models is provided. Parasitoids emanating from a population outbreak of tussock moths (Orgyia vetusta) suppressed the growth of nearby experimental populations of the moth, while experimental populations farther away were able to grow. This result explains the observed localized nature of tussock moth outbreaks and illustrates how population distributions can be regulated by dynamic spatial processes.     

蚕沙叶绿素锌钠盐的制备工艺研究

以蚕沙叶绿素为原料，经皂化、酸化、锌代、成盐等反应制备叶绿素锌钠盐，通过响应面法考察氢氧化钠的浓度、皂化时间和锌代时间三个因素对叶绿素锌钠盐产率的影响。结果表明：氢氧化钠的浓度越大叶绿素锌钠盐的产率就越大，而最佳的皂化时间是40min，最佳的锌代时间是60min。     

温毒清浸膏醇沉前后对鸡新城疫抗体效价的影响

为了研究温毒清浸膏醇沉前后及其不同剂量对鸡新城疫抗体水平的影响,选择150只试验鸡并随机分成5组,设1个对照组,4个给药试验组,每组30只。给药试验组Ⅰ、Ⅱ、Ⅲ集中饮水给药温毒清浸膏,每只用量分别为0.5g、1.0g、1.5g,给药试验组Ⅳ集中饮水给药醇沉除杂后温毒清溶液1.0mL,3周后测定HI抗体效价,分别为7.2、8.4、8.5和7.2,各给药试验组与对照组相比差异显著(P<0.05),且试验组Ⅱ、Ⅲ与对照组相比差异极显著(P<0.01);试验组Ⅱ、Ⅲ与试验组Ⅰ、Ⅳ相比差异显著(P<0.05)。以上结果表明,醇沉前后,温毒清浸膏均能明显提高鸡新城疫抗体水平,但以不醇沉除杂的温毒清浸膏作用更强。     

浅析土壤耕作制度的形成与发展

形成耕作制度的历程 ,也是我国农业政策的发展过程 ,农业生产体制的变革给大农业的耕作制度和耕作学说带来很大的冲击 ,如何完善发展耕作学说和耕作制度是当前迫切需要解决的问题。     

Artificial cloud formation in the atmosphere

An artificial cloud in the cloudless atmosphere at a temperature below 0 degrees C was formed by introducing pellets of Dry Ice into air containing more water vapor than would be present at the saturation point with respect to ice. Such clouds could be utilized to establish radiative equilibrium between ground and air so as to inhibit the cooling of selective arctic surface regions under clear skies.     

Protostar formation in the early universe

The nature of the first generation of stars in the universe remains largely unknown. Observations imply the existence of massive primordial stars early in the history of the universe, and the standard theory for the growth of cosmic structure predicts that structures grow hierarchically through gravitational instability. We have developed an ab initio computer simulation of the formation of primordial stars that follows the relevant atomic and molecular processes in a primordial gas in an expanding universe. The results show that primeval density fluctuations left over from the Big Bang can drive the formation of a tiny protostar with a mass 1% that of the Sun. The protostar is a seed for the subsequent formation of a massive primordial star.     

Magnetic fields in the formation of sun-like stars

We report high-angular-resolution measurements of polarized dust emission toward the low-mass protostellar system NGC 1333 IRAS 4A. We show that in this system the observed magnetic field morphology is in agreement with the standard theoretical models of the formation of Sun-like stars in magnetized molecular clouds at scales of a few hundred astronomical units; gravity has overcome magnetic support, and the magnetic field traces a clear hourglass shape. The magnetic field is substantially more important than turbulence in the evolution of the system, and the initial misalignment of the magnetic and spin axes may have been important in the formation of the binary system.     

Bosonic stimulation in the formation of a bose-einstein condensate

The formation of a Bose-Einstein condensate of a dilute atomic gas has been studied in situ with a nondestructive, time-resolved imaging technique. Sodium atoms were evaporatively cooled close to the onset of Bose-Einstein condensation and then suddenly quenched to below the transition temperature. The subsequent equilibration and condensate formation showed a slow onset distinctly different from simple relaxation. This behavior provided evidence for the process of bosonic stimulation, or coherent matter-wave amplification, crucial to the concept of an atom laser.     

Crust formation and plate motion in the early archean

Mounting evidence for voluminous continental crust formation in the early Archean involving intracrustal melting and selective preservation of granitoid rocks suggests that initial crust formation crust formation and growth were predominantly by magmatic underplating in plumegenerated Iceland-type settings. Collision of these early islands to give rise to larger blocks is suggested by extensive horizontal shortening in both supracrustal and granitoid assemblages. Preservation of early Archean high-grade gneisses that were once at depths of 20 to 30 kilometers implies that these blocks developed thick, subcrustal roots despite high mantle heat flow. Rigid continental plates must have existed since at least 3.5 billion years ago, and greenstone belts (composed of mixed metavolcanic and metasedimentary sequences intruded by granitoid plutons) probably developed on or near these microcontinents. Paleomagnetic data with good age control from at least one ancient craton suggest that plate motion was at normal minimum average velocities of about 17 millimeters per year with respect to the poles during the period 3.5 billion to 2.4 billion years ago. If this is true on a global scale, Archean plate motion was not faster than in later geologic times.     

现代英语新词的构成方法

现代科技的飞速发展,国际、国内政治斗争的日益激烈,从其他语言中借词,用自身的语言材料构词,是现代英语新词不断产生的主要原因。其构成方法可谓多种多样。     

Olfactory learning-set formation in rats

Rats trained on 16 two-odor discrimination problems showed rapid acquisition of a learning set and one-trial learning by the end of the problem series. Learning to sample odor cues before responding and adoption of a "win-stay, lose-shift" strategy probably accounts for the virtually errorless learning. Learning-set performance of rats trained with odor stimulus comparable to that reported for primates trained on visual cues.     

Site-directed neovessel formation in vivo

Angiogenesis is an important component of organogenesis and wound repair and occurs during the pathology of oncogenesis, atherogenesis, and other disease processes. Thus, it is important to understand the physiological mechanisms that control neovascularization, especially with methods that permit the molecular dissection of the phenomenon in vivo. Heparin-binding growth factor-1 was shown to bind to collagen type I and type IV. When complexed with gelatin, heparin-binding growth factor-1 can induce neovascularization at polypeptide concentrations that are consistent with the biological activity of the mitogen in vitro. The adsorption strategy induces rapid blood vessel formation at and between organ- and tissue-specific sites and permits recovery of the site-specific implant for examination and manipulation by molecular methods.     

Fragmentation in massive star formation

Studies of evolved massive stars indicate that they form in a clustered mode. During the earliest evolutionary stages, these regions are embedded within their natal cores. Here we present high-spatial-resolution interferometric dust continuum observations disentangling the cluster-like structure of a young massive star-forming region. The derived protocluster mass distribution is consistent with the stellar initial mass function. Thus, fragmentation of the initial massive cores may determine the initial mass function and the masses of the final stars. This implies that stars of all masses can form via accretion processes, and coalescence of intermediate-mass protostars appears not to be necessary.