从生产经营设备看地质单位经济发展潜力——以浙江煤炭地质局勘探一队为例

浙江煤炭地质局勘探一队主要从事地质勘查及延伸业、机械制造业二大产业,按目前设备分类方法,二大产业占有设备净值分别为40%和60%,但二者创造的经营收入及利润却相差悬殊,设利比（设备余值与利润比值）高达190倍,可见地质勘查及延伸业仍是浙江煤炭地质局勘探一队目前的主要经营方向,而未取得理想效果的机械制造业仍有巨大的潜力。通过对生产设备的综合分析,提出了根据设备构成、设备新度系数、设备完好率等诸多因素分析其对地勘单位发展潜力影响的新方法。     

A numerical study of the effect of hurricane wind asymmetry on storm surge and inundation

The influence of the asymmetric structure of hurricane wind field on storm surge is studied with five types of numerical experiments using a three-dimensional storm surge model. The results from the case of Hurricane Floyd (1999) show that Floyd-induced peak surge would have been much higher had the region of maximum wind rotated 30–90° counterclockwise. The idealized cases (the hypothetical hurricanes) with a wind speed asymmetry of 20 m s^?1 show that the peak (negative) surge varied from 4.7 to 6.0 m (?5 to ?5.7 m) or equivalent to ?8.8% and 16.3% (2.8% and ?10.4%) differences as compared to the control experiment. The area of flooding varied from 3552 to 3660 km². The results from two other idealized cases of varying degree of wind speed asymmetry further show that with decreasing (increasing) asymmetry of wind fields, the variations of peak surge and peak negative surge caused by the rotation of wind fields decrease (increase) accordingly. The results suggest that in storm surge simulations forced by winds derived from balanced models, considerable uncertainty in storm surge and inundation can result from wind asymmetries. This is true even if all other storm parameters, including maximum wind speed, the radius of maximum winds (storm size), minimum central pressure, storm translation speed, drag coefficient, and model settings (domain size and resolution) are identical. Thus, when constructing ensemble and probabilistic storm surge forecasts, uncertainty in wind asymmetry should be considered in conjunction with variations in storm track, storm intensity and size.     

半滑舌鳎（Cynoglossus semilaevis）促性腺激素受体在雄性生殖周期中的表达

采用RT-PCR方法,研究了促性腺激素受体（FSHR和LHR）基因在雄性半滑舌鳎繁殖周期中的季节表达规律。结果表明,FSHR mRNA在雄鱼精巢、脑和脾中及LHR mRNA在雄鱼的精巢和脾中均呈季节规律性变化。3月份样品中,FSHR mRNA在精巢表达量最低,12月份,表达量最高;FSHR mRNA在脑中表达模式与精巢...     

树木径向生长机制监测和模拟研究进展

 传统的树轮气候学重建研究是基于现代仪器观测资料和树轮序列的统计相关实现的,缺乏机制方面的研究。可靠地重建历史时期的气候变化,需要理解树木径向生长的气候响应机理。目前,国际上的树木径向生长机制研究主要有两种途径,监测与模拟,其中监测研究包括应用树木径向生长测量仪(Dendrometer),微树芯法(Micro-coring)和针刺创伤法(Pinning)3种。从两类大的研究途径出发,综述了国内外的研究进展情况,并对未来发展趋势提出展望。     

Water-saving potential in aeolian sand soil under straight tube and surface drip irrigation in Taklimakan Desert in Northwest China

Evaporation loss from the saturated soil beneath drip irrigation emitters highly influences the irrigation efficiency of drip irrigation (DI). Subsurface drip irrigation (SDI) is one good approach to curb this inefficiency, but in a new irrigation method, straight tube irrigation (STI), the irrigation tubes do not need to be buried and thus STI is recommended to increase the irrigation efficiency under normal surface-applied DI. STI consists of only connectors and water-transference tubes that can directly transfer irrigation water from the lateral emitters in the drip line to the root zone of plants. Five-month field experiments were carried out in Aeolian sand soil in the forest-belts of the Taklimakan Desert, which have poor water storage capacity, to compare the potential water saving between STI and DI. The preliminary results showed that, compared with DI, STI (1) improved the soil water content in soil depths from 40 to 100 cm under the soil surface; (2) achieved the same irrigation effects in relatively shorter irrigation durations; (3) had very little water loss due to deep seepage; and (4) formed a layer of dry sand about 10 to 30 cm thick immediately below the soil surface, which lessened evaporation loss of soil water beneath the emitters on the soil surface. This demonstrates that STI can maximize the water-saving potential of DI through the reduction of wetted soil perimeters on the soil surface. This is valuable information for water-saving engineering applications and projects with STI in arid and semiarid regions.     

FINANCING MODE FOR SUSTAINABLE FARMLAND CONSOLIDATION

Sustainable farmland consolidation covers ecology, economy and society, which means, its only goal is to protect eco-environment, in accordance with public benefits and economic laws. China is still a developing country, facing capital-lacking, an important but difficult problem, while sustainable farmland consolidation will need more money than common farmland consolidation. To solve the problem, this paper put forward and designed a new financing mode for farmland consolidation: BOT(Build-Operate-Transfer), which can effectively solve the financing problem and investment reclamation by the way of concession, and make sustainable farmland consolidation be realized in China.     

浙江省岩石地层清理成果简介

本文介绍浙江省岩石地层单位清理成果。按照岩石地层单位划分出原则，对浙江省境域内出露的元古界—第四系进行全面清理：划分出岩石地层单位109个，其中群级11个、组级94个；在清理中新建3个组，启用6个群19个组，引用外省12个组，未采用2个群27个组。并明确各岩石地层单位的含义及时代。     

浙江省萧山—富阳前震旦纪双重基底及构造演化

萧山—富阳一带的前震旦系，分别由中元古代陆缘岛弧型双溪坞群火山岩、新元古代青白口纪河上镇群弧后盆地沉积和双峰式陆相火山岩组成。中元古代末的神功运动表现强烈，青白口纪末的晋宁运动叠加褶皱明显。剖面连续完整，地质现象丰富．是华南重要的层型剖面。     

The Hβ Chromospheric Magnetic Field in a Quiescent Filament

We observed the line-of-sight magnetic field in the chromosphereand photosphere of a large quiescent filament on the solar disk on September 6, 2001 using the Solar Magnetic Field Telescope in Huairou Solar Observing Station. The chromospheric and photospheric magnetograms together with Hβ filtergrams of the filament were examined. The filament was located on the neutral line of the large scale longitudinal magnetic field in the photosphere and the chromosphere. The lateral feet of the filament were found to be related to magnetic structures with opposite polarities. Two small lateral feet are linked to weak parasitic polarity. There is a negative magnetic structure in the photosphere under a break of the filament. At the location corresponding to the filament in the chromospheric magnetograms, the magnetic strength is found to be about 40-70 Gauss (measuring error about 39 Gauss). The magnetic signal indicates the amplitude and orientation of the internal magnetic field in the filament. We discuss several possible causes which may produce such a measured signal. A twisted magnetic configuration inside the filament is suggested .     

Monitoring periodically national land use changes and analyzing their spatiotemporal patterns in China during 2015–2020

Journal of Geographical Sciences - High-resolution mapping and monitoring of national land use/cover changes contribute significantly to the knowledge of the interaction between human activities...