微带发夹型滤波器的设计

微带发夹型滤波器具有结构紧凑,尺寸小、重量轻和成本低等优点.根据微波电路设计的基本理论,利用微波电路ADS软件,设计了一个微带发夹型滤波器,其中心频率为2.3GHz时,通带带宽为200MHz,通带内插损小于1.7dB.仿真结果表明所设计的滤波器不仅尺寸小,而且性能优越,具有很高的实用价值.     

五部委联合下发通知要求加强土地出让收支管理

财政部、国土资源部、中国人民银行、监察部、审计署联合下发《关于进一步加强土地出让收支管理的通知》。要求不折不扣地将土地出让收支全额纳入地方基金预算管理．保障土地出让收入及时足额征收和缴入地方国库。《通知》要求,市县国土资源管理部门在国有土地出让合同、租赁合同、划拨决定书中,     

数字金融发展与海洋战略性新兴产业融资环境优化

海洋战略性新兴产业的发展需要充足的资金支持,优化融资环境是加快我国海洋战略性新兴产业发展的动力源泉。文章基于2011—2020年我国海洋战略性新兴产业上市公司的相关数据,探讨数字金融发展对相关企业融资环境的影响。研究结果表明：数字金融发展显著优化我国海洋战略性新兴产业的融资环境,其中数字化程度的优化作用最强,数字金融发展对北方地区融资环境的优化作用强于南方地区,数字金融发展通过提高市场化水平进而促进海洋战略性新兴产业融资环境的优化。研究结论可为我国数字金融发展和海洋战略性新兴产业技术创新等方面提供可靠证据和政策方向。     

Nitrogen and Phosphorus Budget of a Polyculture System of Sea Cucumber （Apostichopus japonicus）, Jellyfish （Rhopilema esculenta） and Shrimp （Fenneropenaeus chinensis）

The nitrogen(N) and phosphorus(P) budget and the ecological efficiency of a polyculture system of sea cucumber(Apostichopus japonicus), jellyfish(Rhopilema esculenta) and shrimp(Fenneropenaeus chinensis) were studied in a cofferdam, 120.2 ha in size. The nutrients were supplied by spring tide inflow. In total, 139600 kg N yr-1 and 9730 kg P yr-1 input to the system; while 118900 kg N yr-1 and 2840 kg P yr-1 outflowed from the system concurrently, thus the outflow was 85.7%(N) and 29.2%(P) of inflow. The production of N and P was 889.5 kg yr-1 and 49.28 kg yr-1(sea cucumber) and 204 kg yr-1 and 18.03 kg yr-1(jellyfish and shrimp), respectively. The utilization rate of N and P by polycultured animals was 7.8‰ and 6.9‰, respectively, 21.9% and 38% higher than that of monocultured sea cucumber. Our results indicated that the polyculture system was an efficient culture system of animals and a remediation system of coastal environment as well; it scavenged 14.3% and 70.8% of N and P, respectively. Such an ecological efficiency may be improved further by increasing either the stocking density or the size of sea cucumber or both.     

完成开发投资总额的百分之二十五如何界定?

正案例某企业以出让方式取得一宗国有土地使用权,该公司欲将其部分国有土地使用权转让,根据《中华人民共和国城市房地产管理法》第三十九条规定,以出让方式取得土地使用权的,转让房地产时,应当符合的条件之一是"按照出让合同约定进行投资开发,属于房屋建设工程的,完成开发投资总额的百分之二十五以上"。那么,国有土地使用权变更登记时,如何界定完成开发投资总额的百分之二十五?     

试谈如何丰富国家宏观经济核算指标

正GDP是国内生产总值的英文缩写,作为反映经济趋势最重要的指标,GDP核算为我国的经济发展做出了重要的贡献,但GDP本身也有缺陷,如侧重于对经济增量的反映,而不能反映经济质量的好坏等。当前,对于GDP及其衍生指标的增加常见诸笔端。经济持续增长并不一定意味着人民生活满意度的增加,中国许多经济学家感到虽然GDP指标为我国经济发展做出了重要而积极贡献,但是没有涵盖一些重要因素,不能全面地反映一个国家的经济活动,于是纷纷寻找一些新的宏观经济指标来作为     

土地储备资金管理问题及对策探析

一、土地储备资金管理上存在的主要问题 1．土地储备资金筹集存在的主要问题 一是土地储备资金筹资渠道较为单一。政府财政资金与储备机构自筹资金在整个资金来源结构中份额过小,资金负担过多地倾向于向金融机构的贷款,造成城市土地储备资金不能得到充分保障,不利于土地储备目标的最终实现。二是土地储备资金运行资金成本较大。贷款额度巨大导致融资利息总支出很高,增加财务成本;房地产贷款一般期限较短,而土地收购储备期较长,很容易造成储备机构整体资金周转困难和中断。三是土地储备资金运行中的财务利息风险、经营风险以及环境风险都较高,如一些政府官员的“寻租”行为、贪污腐败和地下灰色交易等导致的风险。     

Heat budget of the south-central equatorial Pacific in CMIP3 models

ABSTRACT Using data from 17 coupled models and nine sets of corresponding Atmospheric Model Intercomparison Project （AMIP） results, we investigated annual and seasonal variation biases in the upper 50 m of the south-central equatorial Pacific, with a focus on the double-ITCZ bias, and examined the causes for the amplitude biases by using heat budget analysis. The results showed that, in the research region, most of the models simulate SSTs that are higher than or similar to observed. The simulated seasonal phase is close to that observed, but the amplitudes of more than half of the model results are larger than or equal to observations. Heat budget analysis demonstrated that strong shortwave radiation in individual atmospheric models is the main factor that leads to high SST values and that weak southward cold advection is an important mechanism for maintaining a high SST. For seasonal circulation, large surface shortwave radiation amplitudes cause large SST amplitudes.     

Surface rainfall and cloud budgets associated with mei-yu torrential rainfall over eastern China during June 2011

Surface rainfall and cloud budgets associated with three heavy rainfall events that occurred over eastern China during the mei-yu season in June 2011 were analyzed using 2D cumulus ensemble model simulation data.Model domain mean rainfall showed three peaks in response to three prescribed ascending motion maxima,primarily through the mean moisture convergence during the torrential rainfall period.Prescribed ascending motion throughout the troposphere produced strong convective rainfall during the first （9 June） and third （17-18 June） rainfall events,whereas strong prescribed ascending motion in the mid and upper troposphere and weak subsidence near the surface generated equally important stratiform and convective rainfall during the second rainfall event （14 June）.The analysis of surface rainfall budgets reveals that convective rainfall was associated with atmospheric drying during the first event and moisture convergence during the third event.Both stratiform and convective rainfall responded primarily to moisture convergence during the second event.An analysis of grid data shows that the first and third mean rainfall maxima had smaller horizontal scales of the precipitation system than the second.     

黄坪上塘矿区水文地质条件及涌水量预测分析

结合贵州省黄坪县上塘矿区的水文地质条件特征,提出新的涌水量预算方法,预测得出：矿坑正常涌水量为2545m3／d,最大涌水量为99484m3／d,未来矿坑涌水量较大,对矿山开采有很大威胁。提出地表拦截和地下水抽排措施。