饲料氟含量测定中的数据处理及注意事项

论述了饲料氟含量测定中用标准回归方程法代替格氏图解连续标准加入法的数据处理问题 ,总结并提出了测定过程中的注意事项     

Deconfined quantum critical points

The theory of second-order phase transitions is one of the foundations of modern statistical mechanics and condensed-matter theory. A central concept is the observable order parameter, whose nonzero average value characterizes one or more phases. At large distances and long times, fluctuations of the order parameter(s) are described by a continuum field theory, and these dominate the physics near such phase transitions. We show that near second-order quantum phase transitions, subtle quantum interference effects can invalidate this paradigm, and we present a theory of quantum critical points in a variety of experimentally relevant two-dimensional antiferromagnets. The critical points separate phases characterized by conventional "confining" order parameters. Nevertheless, the critical theory contains an emergent gauge field and "deconfined" degrees of freedom associated with fractionalization of the order parameters. We propose that this paradigm for quantum criticality may be the key to resolving a number of experimental puzzles in correlated electron systems and offer a new perspective on the properties of complex materials.     

Focal points in mass spectrometry

Mass spectrometry has advanced with the renaissance of time-of-flight mass analysis, the use of ion traps as analyzers and reactors, the application of tandem mass spectrometers to problems in ionic reaction mechanisms and chemical analysis, and the development of new desorption ionization techniques. These developments have allowed determination of the molecular weight distributions for polymers through the 10,000-dalton range, as well as the molecular weight and partial sequence of biopolymers of similar size. Surfaces can be characterized by use of the mass, energy, and angle distributions of particles ejected by sputtering or by laser-induced desorption. Mass spectrometry has yielded new information on the kinetics of catalytic surface reactions and on the reactivity of metal clusters.     

计算机数据属性及SQL数据的查询

计算机科学中计算机数据是计算机科学应用的关键。计算机数据的属性因计算机软件开发的要求的不同而异。文章就计算机数据的属性论述了一些有关数据属性的分类,数据属性的标准,以及独立开发计算机数据属性的可能带来的正反两方面的影响。并对一些国际通用的计算机数据的属性,例如,计算机汉字的编码GB码,图像文件的编码以及图像文件的各类编码。数据库SQL数据的编码,以度对SQL数据结构化查询语言的数据进行了论述。     

Universal signatures of fractionalized quantum critical points

Ground states of certain materials can support exotic excitations with a charge equal to a fraction of the fundamental electron charge. The condensation of these fractionalized particles has been predicted to drive unusual quantum phase transitions. Through numerical and theoretical analysis of a physical model of interacting lattice bosons, we establish the existence of such an exotic critical point, called XY*. We measure a highly nonclassical critical exponent η = 1.493 and construct a universal scaling function of winding number distributions that directly demonstrates the distinct topological sectors of an emergent Z(2) gauge field. The universal quantities used to establish this exotic transition can be used to detect other fractionalized quantum critical points in future model and material systems.     

鲜食春大豆播种保苗五要点

鲜食春大豆播种期时间跨度长，天气变化快，播种条件不同，为了提高大豆出苗率在播种时要注意以下5个方面：     

籼稻杂交育种的亮点

通过回顾杂交籼稻育种过程,对2000年以来审定通过的一批优质不育系进行比较,分析新育成杂交稻组合的特点,指出杂交籼稻优质组合育种生产的方向。     

无公害大蒜高产栽培技术要点

梅江区城北地处梅州城区，是梅州城区蔬菜生产的主要基地，大蒜是我区栽培的主要蔬菜之一，城北镇远离工矿区，周边无“三废”排放企业。农田大气环境良好，灌溉水质、土壤环境质量符合无公害蔬菜生产条件，土壤耕层深厚、土质肥沃，有机质含量在1．0％以上，适宜大蒜生长。     

蔬菜高效栽培技术要点

总结了蔬菜高效栽培的技术要点,高度重视蔬菜栽培的各个环节即品种、壮苗、栽培管理和贮藏加工。     

樱桃大树移植技术要点

樱桃在春天观光、采摘已成为“都市农业”和“城郊经济”的一个亮点，发展速度很快，经济效益较高。但是，由于樱桃树栽植到丰产需要5-6年时间．难以满足当前市场发展的需要。2004—2005年我们从山西省和山东省调入5年生樱桃大树1200余棵。经在北京海淀区、门头沟区、怀柔县和平谷县进行了2年栽培试验．平均成活率88．2％。当年挂果率达67．5％，第二年结果率94．6％．亩产樱桃480-560kg。其主要移植管理技术要点如下：     

Hypertension. Mutation points to salt recycling pathway

A team of researchers at Yale Medical School has uncovered a gene mutation that leads to early-onset hypertension that may point the way to causes for more common forms of high blood pressure. On page 119, the Yale group reports finding a new mutation in the so-called mineralocorticoid receptor, a protein in kidney cells that is involved in the body's handling of salt. This is the first work to demonstrate how alterations in the receptor could give rise to hypertension; in particular, the findings may explain why some women experience a sharp rise in blood pressure during pregnancy.     

露地夏萝卜栽培技术

1选用适宜良种 夏萝卜栽培应选择耐热性好、抗逆性强的早熟品种,如红丸二十日小萝卜、扬花萝卜等.     

大荚荷兰豆春季栽培技术要点

大荚荷兰豆是以采收嫩荚为商品的豌豆品种,荷兰豆可用来炒食、拌菜、做汤等,质地清脆、口味美好,内含蛋白质、胡萝卜素、核酸等营养元素,是国际市场上畅销的高档水果型蔬菜。1播前准备1.1土壤选择选用土层深厚肥沃、土质疏松、通气良好、排水便利的地块,并要求前茬未种过豆科作     

水文信息共享空间数据仓库模型研究

为解决水文信息共享问题,本文从分析水文数据本身固有的特性出发,建立了基于空间数据仓库的具有多层维度和度量属性的水文信息共享数据模型,结合面向对象的思想,提出水文信息单元,并探讨了以之建立水文信息数据仓库的方案。