旱农区主要农作物土壤水分变化初探——以内蒙古武川旱农试验区为例

对内蒙古武川旱农试验区栗钙土耕作带土层水分动态进行研究．旱农区土壤水分在一年内经过春季干旱失墒期、夏季干旱失墒期、秋季蓄水保墒期、冬季缓慢失墒期等４个时期．在０～２００ｃｍ土壤剖面内按其供水性能可分为：０～２０ｃｍ为水分骤变层,２０～５０ｃｍ为浅蓄水层,５０～２００ｃｍ为深蓄水层     

矩阵方程A^m=J的某些解

如果一个（０．ｌ）ｇ－循环矩阵的阶为ｃｋｍ，行和为ｃｋ且其 Ｈａｌｌ多项式被Ｔｃ（ｘ）Ｔｃ（ｘｃｎ）……Ｔｃ（ｘｃ（ｋ－１）ｍ）整除，其中ｍ，ｋ为正整数．ｃ为大于１的整数，Ｔｃ（ｘ）＝１＝ｘ＝……ｘ（ｃ－２），则它满足方程Ａｍ＝Ｊ，称之为这个方程的（ｃ，ｋ）－型解。本文用归纳法给出了某些（ｃ，ｘ）一型解的构造，并通过计算（ｃ，ｋ）－型解的秩．证明了方程Ａｍ＝Ｊ的不同型的解是不同构。最后，证明了方程Ａｍ＝Ｊ的所有（ｃ，１）－型解部是同构的．     

胎儿颈部淋巴管瘤1例

孕妇于某，怀孕３１周，胎动消失２天来院。Ｂ超诊断：胎头下方，颈部可见１０．６×１０ｃｍ无回声光团，内可见线性强回声，胎心消失，胎头光环完整，颅腔构造正常，双顶径７．７ｃｍ，脊柱完整，羊水暗区１０．０ｃｍ。４月１８日行雷夫奴尔液中止妊娠４月１９日２０：４５分娩一男性死婴，体重１７００ｇ身长４０ｃｍ，双顶颈７．７ｃｍ，头围２９ｃｍ，鼻、眼、耳外观正常，胸、腹部皮肤充血，外生殖器略有水肿和充血样变化。病理报告：淋巴管瘤。讨论淋巴管瘤在小儿也很多见，但是浅表性淋巴管瘤是罕见的，它可发生于人体任何部位。最…     

GaAs／AlGaAs多量子阱结构材料的光致发光特性

采用ＭＯＣＶＤ技术制备了ＧａＡｓ／ＡｌＧａＡｓ多量子阱结构材料，对其进行了光致发光特性的测量，结果观察到５个发光峰，其波数分别为ｕ＝９６００ｃｍ＾－１，１２０２０ｃｍ＾－１，１２２４０ｃｍ＾－１１２５５０ｃｍ＾－１和１３０７０ｃｍ＾－１，并对发光峰的位置进行了理论的说明。     

乳腺叶状囊肉瘤一例报告

１病例患者，女，５９岁。因反复出现左乳腺肿块１９年，于１９９４年１月１１日入院。１９７５年患者发现左乳腺内上方有一３ｃｍ×３ｃｍ之肿块，活动，无痛，与月经无关。在当地医院行局部肿物切除术。术后病理诊断为：纤维瘤。１９７８年患者再次在同一部位发现３ｃｍ...     

巨尾桉株行配置造林试验研究

巨尾桉是最速生高产的桉树，在相同的条件下造林，单位面积株数相等（１６６５株／ｈｍ２），采取四种株行配置造林方式，生长差异非常明显，株行距１ｍ×６ｍ的，定植后３年５个月，平均树高１３．７２ｍ，平均胸径１０．１４ｃｍ，蓄积量６８．７６ｍ３／ｈｍ２，长势名列前茅。     

冬季水果黄瓜日光温室高产栽培技术

水果黄瓜是近几年深受市场欢迎的蔬菜新品种。北方地区冬季气温低，农民采用传统日光温室生产有一定闲难，往往因为地温低、病害发生严重而造成减产甚至绝产、绝收。北京市密云县种植业服务中心连续两年在日光温室试验水果黄瓜高产高效生产技术，取得较好成效，值得北方寒冷地区借鉴。试验结果表明，冬季日光温室采用内外结合式秸秆生物反应堆技术。     

芦笋秋季育苗技术初探

为了探索芦笋育苗和高产技术，于１９９９年９月中旬在柳州市太阳村镇上等村进行芦笋育苗试验，品种为美国芦笋ＵＣ１５７和ＵＣ７２，试验面积为０．６６７ｈｍ＾２。种子播种前经过晒种、漂洗、消毒、浸种催芽处理。播种行距１３ｃｍ～１５ｃｍ，株距７ｃｍ～８ｃｍ，种子播后覆细土１ｃｍ～２ｃｍ。结果是ＵＣ１５７品种平均出苗率８２．３％，平均成苗率６４．８６％，每颗种苗长出地上茎平均有３．３条，最多６条，幼苗平均高１     

鳄蜥皮肤光镜与扫描电镜观察

光镜观察，鳄蜥皮肤由深层到表面，依次是生发层、中间层、α角质层、β角质层和角皮层。扫描电镜３５００倍观察，皮肤鳞片角皮层具有小刺和小窝的细微结构，小刺长８２．４μｍ，基部直径为９．１２μｍ；２０００倍观察另一小刺长１４．６μｍ，基部直径为２．７μｍ，小窝直径为１６μｍ，小刺和窝在角皮层上是零星分布。     

刘公岛水域内叶绿素—a含量和初级生产力

据１９９０年１１月至１９９１年８月间调查资料，提出刘公岛水域内叶绿素－ａ含量的时空分布和初级生产力的分布与变化。指出此分布与该水域温度和营养盐含量密切相关。叶绿素－ａ含量以春季最高，冬季次之，秋季稍低，夏季最低。年变幅为０．２１￣２．４５ｍｇ／ｍ＾３，年平均值为１．０２ｍｇ／ｍ＾３。初级生产力以夏季最高，春季次之，秋季略低，冬季最低，年变幅为３３．４０￣５１２．７２ｍｇ·ｃ／ｍ＾２·ｄ，年平均值为     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that