合阳县推出护路林新招

林木的栽后管理是造林绿化工作中的一个最关键的环节。为了搞好道路两旁的林木管护,彻底扭转“年年植树年年光,年年植树老地方”的不良现象,陕西合阳县实施了“购买路权、租赁路段、承包路段”3种管护形式,并在马家庄、王村、路井等乡镇取得了较好的效果。他们的主要做法是: 1.转换观念。县委深入各乡镇、村、组进行调查研究,先后召开多次干部。

辛勤耕耘播撒绿荫——记全国绿化先进个人吾甫尔

如今,在农七师一三○团90.42万亩的土地上,奇迹般地出现了一片成荫绿树,只见道路林纵横交错,条田林整齐划一,庄园林枝繁叶茂。然而谁会想到,在这翻天覆地的变化中凝聚了该团副团长吾甫尔的多少心血与汗水,在他主管林业工作的几年里。

挥汗石岗墩 再造金张掖

4月11至12日,张掖消防支队及张掖、临泽消防中队40余名官兵,在张掖市东南郊参加再造金张掖义务劳动。 这次活动是为了贯彻落实张掖市“再造一个山川秀美的金张掖”,把12万亩的石岗墩滩建成渠路林田相配套的高新技术示范区。

Influence of roads on small rodents population in fragmented forest areas, South Korea

The road effect on small rodent population is investigated at 8 fragmented forest areas in the Baekdudaegan mountain range, South Korea in September 2001. We especially focused on the distribution and body condition of small rodents near the roads. Korean field mouse (Apodemus peninsulae) seems to be more sensitive to the existence of a road than striped field mouse (Apodemus agrarius). Korean field mouse prefers interior forest area to around road. Striped field mouse is a habitat generalist and has wide distributional range around road, but Korean field mouse is forest-inhabiting species and their distribution is limited in forest area. These results suggest the effect of road is different on each small rodent species and their habitat preferences.

Anthropogenic Impacts on the Sediment Flux in the Dry-hot Valleys of Southwest China—an Example of the Longchuan River

The sediment flux data, measured from a dry-hot valley of the Longchuan River, a tributary of the lower Jinsha River, were analyzed with Mann-Kendall test, Seasonal Mann-Kendall test and Sen’s test. In both the upper reaches (Xiaohekou) and the lower reaches (Xiaohuangguayuan), the sediment fluxes showed a significant increase from 1970 to 2001, despite the fact that the water discharge did not change significantly during the period and numerous reservoir constructions which contribute to the trap of sediment. This can be attributed to the intensification of human activities, especially the activities related to land surface disturbances such as deforestation and afforestation, expansion of agriculture land, and road constructions. This increase is more significant in the lower reaches of the river observed at the place of Xiaohuangguayuan due to the dry-hot climate. The profound increase in sediment flux has significant implications for effective management of the sedimentation problems of the on-going Three Gorges Reservoir.

Serpentine Design on Forest Roads by the Internal Circular Curve Method： A Case Study in Serbia

The paper provides an overview of geometric solutions of marking all types of serpentine by the method of internal circular curve in designing forest roads directly in the field. The main objective of presenting this original method for marking all serpentine types in one place is to show similarities and differences in marking different types of serpentine, and identify opportunities for further research of this type. The method is based on the establishment of the minimum number of elements necessary to mark the serpentine on the forest roads and other budget elements and their design in the field. By using this method, construction errors or the number of attempts of serpentine marking are reduced, which increases the effects of design compared to the ones reached by the previous method of marking the serpentine on forest roads.

Solution of pavement temperature field in“Environment-Surface”system through Green's function

In order to simplify the boundary conditions of pavement temperature field,the "Environment-Surface" system which considered the natural environment and pavement surface was established.Based on this system,the partial differential equations of the one-dimensional heat conduction in the pavement were established on the basis of the heat transfer theory.Furthermore,the function forms of the initial and boundary conditions of the equations were created through the field experiments.The general solution of the pavement one-dimensional heat conduction partial differential equations was acquired by using Green's function,and the explicit expression of pavement temperature field under specific constraint conditions was derived.For the purpose of analysis,the pavement temperatures in different seasons were calculated using the explicit expression of pavement temperature field,and the calculation accuracy was analyzed through the comparison between measured and calculated values.Then,the relationship between fitting accuracy and calculation accuracy of pavement temperatures was analyzed.The analysis results show that: the usage of "Environment-Surface" system simplifies the calculation of pavement temperature field; the relative error between calculated and measured values is generally less than 7% and is seldom influenced by seasons; there is a positive correlation between the calculation accuracy and the fitting accuracy of pavement surface temperature; high fitting accuracy would result in less error of pavement temperature prediction.

AKT1 and AKT2 Promote Malignant Transformation in Human Brain Glioma LN229 Cells

OBJECTIVE To confirm the role played by AKT1 and AKT2 in the β- catenin/Tcf-4 signaling pathway in promoting malignant transfor- mation of glioma cells. METHODS LN229 cells were divided into five groups： a control group, acetone （ACE）group, acetylsalicylic acid （ASA; aspirin） group, ASA＋AKT1 plasmid group and ASA＋AKT2 plasmid group. Western blot and PCR were used to detect the expression of AKT1 and AKT2 after dealing with ASA and transferring AKTI/2 genes into LN229 cells. Cell proliferation was determined by flow cytometry, cell invasion was evaluated by transwell assay and cell apoptosis was detected with annexin V staining. The molecules regulating proliferation and invasion were examined by western blot analysis. RESULTS Aspirin down-regulates AKT1 and AKT2 expression by modulating β-cateninfrcf-4 activity. AKT1 and AKT2 can enhance cell proliferation and invasion by up-regulating the expression of cyclin-D and matrix metalloprotein-9 （MMP-9） in LN229 glioma cells. CONCLUSION AKT1 and AKT2 play an important role in the β- catenin/Tcf-4 signaling pathway promoting malignant transformation; AKT1 is more effective than AKT2. AKT1 and AKT2 may be potential targets for brain glioma therapy and an effective way to prevent metastasis of gliomas.

One-Step Generation of Multiqubit Greenberger-Horne-Zeilinger States in a Driven Circuit QED System

We propose an efficient scheme to generate multiqubit Greenberger-ttorne--Zeilinger （GHZ） states by one- step quantum operation in a driven circuit quantum electrodyna.mics （QED） system. Our proposal is based on a unitary evolution exp[-iλSx^2], with Sx being the collective spin operator in x direction and A a controllable parameter, induced by driving the resonator. The quantum operation avoids resonator-field decay and may achieve the GHZ states with ideal success probability. The feasibility with the experimentally-demonstrated circuit QED system is also discussed.

Structural-acoustic coupling characteristics of honeycomb sandwich plate based on parameter sensitivity analysis

The structural-acoustic coupling model for isotropic thin elastic plate was extended to honeycomb sandwich plate(HSP) by applying Green function method.Then an equivalent circuit model of the weakly-strongly coupled system was proposed.Based on that,the estimation formulae of the coupled eigenfrequency were derived.The accuracy of the theoretical predictions was checked against experimental data,with good agreement achieved.Finally,the effects of HSP design parameters on the system coupling degree,the acoustic cavity eigenfrequency,and sound pressure response were analyzed.The results show that mechanical and acoustical characteristics of HSP can be improved by increasing the thickness of face sheet and reducing the mass density of material.

陈仓古道考

作为一个地理实体,陈仓古道实指汉中关中间秦岭山区的一条谷道。据说这条谷道曾是秦汉之际刘邦北定三秦、韩信"明修栈道、暗度陈仓"之路。但此说源于宋代平话、元代杂剧,于史无徵,并非事实。而陈仓古道之名却由元代而历明清,流传至今。考校这条谷道被开辟利用的时间,则既非早在秦汉,亦非晚至宋元。当在唐宋褒斜道(亦即元明清连云栈道)出现之后。唐末五代的"桑林路"可能就是它的前身。

企业家为何状告公安局

家族企业再演悲剧。执法者怎样对待家庭成员之间的侵财问题是一个非常值得关注的现象。

Strategic Ideas of Greenway Construction in Ecological Zhejiang Province

This article grasps the implication of ecology based on thetheory ofgreenway. With the purposeofmaking Zhejiang Provincebecomeanecological province,itpointsoutthattheproblems exist in the greenway construction and makes it clear that the greenway construction is very important. Furthermore, in combination with the linear green open spaces, such as greening passages, touristareas, and administration facilitiesin Zhejiang Province, this article putsforward the strategic ideas of the greenways construction and the strategies, measures to apply the greenways construction.

Negative Differential Resistance in Atomic Carbon Chain-Graphene Junctions

We investigate the electronic transport properties of atomic carbon chain-graphene junctions by using the density-functionla theory combining with the non-equilibrium Green＇s functions. The results show that the transport properties are sensitively dependent on the contact geometry of carbon chain. From the calculated I-V curve we find negative differential resistance （NDR） in the two types of junctions. The NDR can be considered as a result of molecular orbitals moving related to the bias window.