The Research on the Status of Small-and-Medium-Sized Enterprises of County in the Dominant Industry of Shaanxi County Economy

The thesis analyzes the role of small-and-medium-sized enterprises of county in promoting county economy:the small-and-medium-sized enterprises of county become the material basis of developing production and boosting county economy;the small-and-medium-sized enterprises of county become the main channel of increasing farmers' job opportunities and realizing affluent life;the development of the small-and-medium-sized enterprises of county become the propeller of development of urbanization and county economy;the development of the small-and-medium-sized enterprises of county creates excellent conditions for the construction of modern agriculture.The thesis indicates that the low level of county industrialization is the principal factor impeding the county economy of Shaanxi Province and it also analyzes the opportunities and challenges when quickening the development of county industry.The countermeasures of developing small-and-medium-sized enterprises are put forward as follows:raise the awareness and determine the concept of using industry to make county powerful;build scientific planning and outline of county enterprise development to propel the innovation of developing and operating system of county enterprise;create beneficial conditions and reinforce the degree of county enterprise support entrepreneurship;take the park construction as vehicle and reinforce the degree of attracting investments from overseas;take the autonomous innovation as the impetus and develop the recycling economy;improve and optimize the service environment so as to create an excellent investment environment for enterprise.

Current situation and human health risk assessment of fluoride enrichment in groundwater in the Loess Plateau:A case study of Dali County,Shaanxi Province,China

This study aims to investigate the mechanisms and health risks of fluoride enrichment in groundwater in the Loess Plateau,China.By taking Dali County,Shaanxi Province,China as an example,this study obtains the following results through field investigation and the analyses of water,soil,and crop samples.(1)The groundwater can be divided into two major types,namely the Quaternary pore-fissure water and Karst water.The Karst area and sandy area have high-quality groundwater and serve as the target areas for optional water supply.The groundwater in the study area is slightly alkaline and highly saline.Meanwhile,high-fluoride groundwater is mainly distributed in the loess and river alluvial plains in the depression area of the Guanzhong Basin and the discharge areas of the groundwater,with the highest fluoride concentration exceeding seven times the national standard.(2)Fluoride in groundwater mainly originates from a natural source and human activities.The natural source refers to the fluoride-bearing minerals in rocks and soil,and the fluoride from this source is mainly controlled by natural factors such as climate,geologic setting,pH,specific hydrochemical environment,ion exchange,and mineral saturation.Human activities in modern life can be further divided into industrial and agricultural sources primarily.(3)The health risks of fluoride contamination are very high in the Loess Plateau,especially for children compared to adults.Meanwhile,the risks of fluoride exposure through food intake are higher than those through drinking water intake.The authors suggest selecting target areas to improve water supply and ensure the safety of drinking water in the study area.Besides,it is necessary to plant crops with low fluoride content or cash crops and to conduct groundwater treatment to reduce the fluoride concentration in drinking water.These results will provide a theoretical basis for safe water supply in the faulted basin areas in the Loess Plateau.

The Taxonomic Status of Spermophilus in the Plague Area of Dingbian County,Shaanxi Province,China

This study was conducted to define the taxonomic status of Spermophilus in the plague area of Dingbian County in Shaanxi Province,China,through the two-factor variance analysis of morphological characteristics,DNA barcoding,and chromosome karyotype analysis.

空间效率视角下县域城乡空间建构方法研究——以陕西潼关县为例

在全面推进城乡一体化建设的宏观背景下,中国城乡的空间结构正在发着根本性变化,尤其是县域范围内城乡空间结构变化更为突出;同时关注城乡空间发展的演变进程,研究其内在作用机制和发展趋势正成为研究的热点。在当前新型工业化与新型城镇化协同推进城乡空间发展趋势下,城市空间与乡村空间的最佳效率匹配,是解决城乡空间发展失衡的新视角。因此文章从空间效率视角审视县域城乡空间,通过梳理城乡空间效率体系,重构"人居空间—产业空间—生态空间—城乡空间",探讨在县域范围内产业—人居—生态空间的最优匹配模式,实现"生活—生产—生态"的发展模式,最终建构从"企业联动—产业循环—产业空间—人居空间—城乡空间"的城乡空间体系,实现合理的产业格局、空间发展模式,促进县域城乡空间一体化的发展。

陕西渭北苹果病虫害综合治理政策和研究的建议(英文)

通过对陕西省渭北苹果生产现状的调查和了解 ,作者提出了几项建议和意见 :(1)鲜果出口需要一套复杂的病虫害管理体系 ,包括植物检疫、有害生物综合治理体系及苹果生产过程中的透明度等 ;(2 )要鼓励和支持进行当地研究 ;(3)培训果农 ,加强技术推广 ,改善果园管理 ,鼓励国家和地区资助项目间充分合作 ;(4 )单一的销售体系是很值得考虑的 ,也就是说 ,所有的果品都由一个机构经销出售 ,这个组织是唯一由法律允许进行苹果、梨出口经营的公司 ,果农推举代表民主经营 ,经费来源于果农自己 ;(5 )尽快调查不合法、未注册的农药销售及生产情况 ,并对这种行为进行严厉惩罚 ;(6 )苹果黑星病或许将会成为该地区的一个严重问题 ,需要优先考虑 ;(7)几种病虫害的发生问题越来越严重 。

陕南寒武系底部磷酸盐化保存的寒武松藻属化石新知

本文描述了产于我国陕西西乡寒武系底部磷矿层中的藻类化石,在标本中发现多种藻枝保存类型和可能的"固着器"等特征;由于藻体微小、藻管中空等特征而将其归入蓝菌类寒武松藻属;可为早寒武世早期的藻类繁盛提供了新的小生境和新的食物来源、加速了后生动物的进化。

陕西南部寒武系底部棘盔状化石再研究

对我国陕南下寒武统底部宽川铺段含磷岩系中棘盔状化石的具刺变态骨Amoebinella echinata的属征进行了补充修改,并对其分类位置和亲缘关系做了探讨。标本分为主支和数个分支,并具棘刺、纵纹及可能的口部等特征,其中部分棘盔类标本可能代表"固着幼虫期"或"螅状幼体期"的独立生物个体而不是动物的外部硬体。

陕南早寒武世早期水螅营养体及管状疑难化石

陕南宁强宽川铺生物群发现具触手的水螅营养体化石,同层位同时发现大量磷质管状疑难化石,其管体上可分辨出可能的出芽特征,推测该类具出芽特征管体可能和现代群体生活的薮枝螅(Obelia)有关。

陕南寒武纪西乡生物群中Anabarites对称性演化研究

阿纳巴管(Anabarites)是寒武纪早期一类形态独特的管栖生物,其横切面的轮廓多样,但所有形态都是"3"的倍数。陕南梅树村期西乡生物群产出大量磷质Anabarites,根据管体上纵槽出现的数目和级别,确认Anabarites可分辨出三种对称类型:A型为仅具有三条一级纵槽的三辐射对称类型、B型具有三条一级纵槽和一条二级纵槽类型、C型具有三条一级纵槽和两条二级纵槽。其中B型、C型是从三辐射到六辐射对称之间的过渡类型,为新发现的对称形式。本文以上述三种类型Anabarites为研究材料,对Anabarites对称性演化途径进行了探索性研究,对寒武纪大爆发之初动物的对称性起源演化研究提供了重要证据。

蒲城县伏头地区矿物药自然铜与蛇含石的矿物学特征对比研究

目的对陕西省蒲城县伏头地区矿物药自然铜与蛇含石进行矿物学鉴定及成分对比。方法先用肉眼及反光镜鉴定,再利用微量元素光谱半定量、红外光谱、X射线衍射等方法进行矿物学及成分测试分析。结果矿物药自然铜、蛇含石均为矿物黄铁矿,但自然铜为立方体黄铁矿单晶体,蛇含石为结核状黄铁矿集合体;反光镜测试自然铜与蛇含石的反射率分别为53%、50%,均为均质体、无内反射;光谱半定量分析显示:自然铜的主要微量元素Cu<5 ppm、Mo 15 ppm、Co 10 ppm、Yb 15 ppm、Mn<200 ppm、K>10 ppm,蛇含石的主要微量元素Cu<5 ppm、Mo 5 ppm、Co 30 ppm、Pb 50 ppm、Sn 50 ppm、Ni 200 ppm、Yb 1 ppm、Mn<200 ppm,K>10 ppm。X射线衍射显示:自然铜中黄铁矿的含量为100%,特征峰2.702(10)、1.630(9)、2.417(7),蛇含石中黄铁矿的含量97%、绿泥石3%,特征峰2.706(10)、1.630(10)、2.419(8)。红外光谱曲线显示:自然铜中黄铁矿的含量>95%,特征谱线417、343 cm-1,蛇含石中黄铁矿的含量为97%,特征谱线413、345 cm-1。结论陕西省蒲城县伏头地区矿物药自然铜与蛇含石中的矿物成分均为黄铁矿,形态特征分别为单晶体立方体晶形、结核状集合体,推测可能是结构差异导致了药理学差异。