西沙小岛变身生态驿站

三沙市委书记兼市长肖杰深有感触地说,南海有两百多个小岛,如果能多建成几个自然环境优美、人民安居乐业的生态驿站,那么"海上丝路"的"珍珠项链"该是多么璀璨。人们无法想象,三年前生活艰苦的西沙小岛,如今可以接待旅客留宿,房间里有空调、热水器,傍晚还能沿着环岛公路散步休闲、赏花看海……三沙市自2012年6月设市以来。

利用一个不等式巧解竞赛题

本文给出一个非常简单的不等式,并用于解证几道国内外数学竞赛题。由a2+b2≥2ab（a,b∈R）,即a2≥b（2a-b）可得推论若a,b∈R且b】0,则a2/b≥2a-b。当且仅当a b时取等号例1 已知x】0,（?）1,2…,n,求证: x1/x2+x2/x3+…+xn/x1≥x1+x2+…+xn。 （1984年全国高中数学联赛试题） 证明:由推论得 x1/x2≥2x1-x2,x2/x3≥2x2-x3,…,x（?）/x1≥2（?）-x1。将以上n个同向不等式两边相加。

纪念海南解放65周年主题文艺晚会日前举行 音乐舞蹈诗《征程》精彩绽放

4月29日和4月30日晚,为深切缅怀那些为解放和建设海南付出生命和青春热血的先辈和英雄,深情讴歌海南解放65年以来取得的巨大成就,展现琼岛儿女不断寻梦、追梦、圆梦、再追梦的壮丽征程,筹备已久的纪念海南解放65周年主题文艺晚会在海南省会海口市省歌舞剧院隆重登场。晚会以音乐舞蹈诗《征程》作为主体内容,为莅临观演的各位领导和海南省的各界贤达奉献了一出由诗歌诵、绚丽歌舞与大屏幕上的经典历史影像交相辉映的分外精彩的视听文艺大餐。

Diagnostic model construction and example analysis of habitat degradation in enclosed bay:Ⅲ. Sansha Bay habitat restoration strategy

Unbalanced inputs and outputs of material are the root cause of habitat degradation in Sansha Bay,Fujian Province,China. However,the cumulative pollution varies in different geographic locations and natural conditions in the enclosed bay. In this study,hydrodynamic conditions,sediment characteristics,and aquaculture methods were recognized as the underlying causes of spatial heterogeneity in the distribution of nitrogen and phosphorous pollutants,the two major controlling factors of habitat degradation in the bay area. In order to achieve the goal of balancing nutrient inputs and outputs in Sansha Bay,we developed a feasible and practical zone restoration strategy for reasonable adjustment and arrangement of aquaculture species and production scale in accordance with varying hydrodynamic conditions and sediment characteristics in six sub-bay areas(sub-systems). The proposed zone restoration strategy lays a solid foundation for habitat restoration and management in Sansha Bay.

Experimental Study on Optimal Layout of Grid Desilting Gallery

Based on the desilting research of one scheduling project in the southwest of China, the method of setting grid desilting gallery before the desilting tunnel is put forward to expand the scope of the scouring funnel before the dam and solve the problem of sediment deposition at the power station water intake. The experimental results show that, in the design of a grid desilting gallery, the width of the grid gallery should not be smaller than that of the desiring bottom intake, the size of the grid orifice should be in the range of 1.5 m--2.0 m along the flow direction, and the grid spacing should be 3--5 times the size of the grid orifice. The discharging ability of the desilting bottom intake will decrease after the grid desilting gallery is added. The average of the decrease rates is about 5%-10%. The scouring funnel draws in the longitudinal direction before the dam obviously after the construction of the grid desilting gallery.

Desertification and Blown Sand Disaster in China

Approximately 331 million ha, one-third of China＇s total land, is prone to desertification processes, leading to natural disasters and economic losses. In this study, the situation, tendency, their influences and their risk governance of desertification and blown sand disaster in China were examined using satellite images, field photographs, field data and a literature review. The desiccated areas in Lop Nor and the lower Heihe River fluvial plain covered about 50,000 km2 and 40,000 km2, respectively. In Ejina, about 100 species of vegetation became extinct. The rate of wind erosion in China was between 1,000 tons/km2/year and 2,000 tons/km2/year. There were 12 sand deserts and sandy lands, occupying a total of 710,000 km2. Salinized soils occurred across 99.1 million ha. The two main sand and dust storm-prone areas in China were the Tarim Basin and its surroundings, and the Alxa Plateau and its surroundings. From 1981 to 2007, the annual average frequency of sand and dust storms varied from 1 d to 37 d with a general increase from southeast to northwest. Since 1978, China has implemented a number of ecological construction projects that have reduced desertification from 1999 to 2004 and from 2005 to 2009, and the number of dust and sand storm days from 9.3 d between 1954 and 1959 to 4.4 d between 2000 and 2007. The results could improve understanding of desertification and blown sand disasters in China and provide valuable experiences for global desertification control.

Scorpion back inspiring sand-resistant surfaces

A new approach which adopted the idea of coupling bionics to improve erosion resistance was presented, by taking the desert scorpion as the research object. The anti-erosion characteristic rules and mechanism of desert scorpion＇s surface under the dynamics effect of gas/solid mixed media were researched, especially the comprehensive influence mechanism of surface morphology, microstructure, creature flexibility and many other factors was studied. Simulation by CFD software was applied to predict the relative erosion severity. Samples with the coupled bionic configurations and flexibility were produced. Experiment optimum design theory was employed to design experiment scheme. Silica sand of particle size of 105-830 ~tm was used as the erodent. The erosion tests were carried out to validate the simulation results obtained. It is shown that the predicted results are in agreement with those obtained from the experiment. And contrast tests were carried out at the best and worst test points of erosion resistance for four samples. Contrast tests show that the erosion resistance trend occurs in such order with the best erosion resistance as coupling sample, groove, smooth and flexibility, and smooth, and the increasing rate of erosion resistances in sequence of 12.08%, 8.87%, 6.03% in the best test point. But in the poorest point, the increasing rate of erosion resistance is in sequence of 15.64%, 9.53%, 6.59%. The morphologies of eroded surface were examined by the scanning electron microscope, and the possible wear mechanism was discussed.

A Screening Program for Overweight Status Among Schoolgirls in Saudi Arabia： A Proposed Co-design Project to Tackle the Problem

The paper realizes the importance of communicating with schools to conduct nutritional screening, assessment and intervention programs for obesity and related risk factors to tackle the problem at earlier stage. The screening program was conducted by dietetics＇ students ＂under supervision＂ as part of their practice and community services to apply some assessment method for mritional status. Two intermediate schools for girls in Jeddah city were involved in the screening stage, followed by a full nutritional assessment and implementation of a designed intervention program at one of the schools. At screening stage, interview questionnaires for diet histories and anthropometric measurements used to screen overweight status and related food patterns. National and international references data used for assessment and comparison. Following screening approach, a designed comprehensive nutritional assessment and intervention program was piloted at one of the screened schools for overweight status. For screening stage： the overall prevalence of overweight girls is 61% （n = 81 out of 133） of the population, 73% （n = 91） of girls were centrally obese. Almost 3/4 of all students reported no participations in any type of physical activities/exercises. Dietary behaviors included non-consumption of breakfast （83%） and low intake of fruit and vegetables （38%）. For intervention stage, the present report concentrates on data concerning post intervention changes in Body Mass Index （BMI） and Waist Circumference （WC）. By the 30 days of intervention there were significant changes in values for BMI according to Saudi growth chart （p value = 0.009） with no changes among the control group. No statistically significant difference in the mean WC of the group. Study＇s results suggest that approaching young girls through schools to screen, assess and intervene overweight status and risk factors is vital. Although the non-random selection of only two schools for screening the prevalence of overweight status among school girls prevent the geralizability of the study findings to wider population, previous studies used random selection of schools and large sample sizes showed a high prevalence of overweight status among Saudi students Therefore, designing and piloting of an intervention program for implementation at a national level is useful to tackle theproblem.

Numerical Analysis of Emergency River Restoration Scheme for Qingping Mega Debris Flow

The mega debris flow occurred on August 13 th 2010 in Qingping town,China(hereafter called '8.13' Debris Flow) have done great damage to the local habitants as well as to the re-construction projects in the quake-hit areas,and the channel-fill deposit problem caused by the debris flow was the most destructive.Moreover,it is of high possibility that an even severe deposit problem would reappear and result in worse consequences.In order to maximize risk reduction of this problem,relevant departments of the government established a series of emergency river restoration schemes,for which the numerical analysis is an important procedure to evaluate and determine the optimized one.This study presents a numerical analysis by applying a twodimensional debris flow model combined with a relevant water-sediment model to simulate the deposit during the progress of the debris flow,and to calculate and analyze the river flow field under both the present condition and different restoration conditions.The results show that the debris flow model,which takes the confluence of the Wenjia Gully to the main river into account,could simulate the deposit process quite well.In the reproduced debris flow from the simulation of the '8.13' Debris Flow,the original river flow path has switched to a relatively lower place just along the right bank with a high speed of near 7m.s-1 after being blocked by the deposit,which is highly hazardous.To prevent this hazard,a recommended scheme is derived through inter-comparison of different restoration conditions.It shows that the recommended scheme is able to reduce the water level and as well to regulate the flow path.Based on the given conditions of the mainstream and the tributary confluence for the simulated '8.13' Debris Flow,when encountering a debris flow with deposit volume less than 0.5 million m3,the river channel can endure a 20-year return flood;however,when the deposit volume increases to 2 million m3,the flood capacity of the river will be greatly impacted and the scheme becomes invalid.The recommended scheme supported by the present study has been applied to the emergency river restoration after this mega-debris flow.

Route evaluation indexes of Changsha-Jishou freeway for protecting cultural heritages and natural environment

The highway construction inevitably may cause certain influence to the cultural heritage and the natural environment along the route, particularly in design stage; if the route selection is unreasonable, it will certainly impact the natural resource seriously along the route. On the contrary, good design can reasonably develop, use, protect and promote the value of cultural heritage and natural environment. Changsha to Jishou （Chang-Ji） freeway is one section of Changsha to Chongqing freeway, which is one of the eight big west channels as planned in China; two cities of Changde and Huaihua and one autonomous region of Xianxi in western Hunan province, along which the cultural heritage and the natural resource are rich, and the natural landscape is exquisite. This paper investigates and analyzes the natural resources along the route of Chang-Ji freeway, puts forward some protection design evaluation indexes for mountain area freeway by the thought of context sensitive design. At last, the paper introduces the effect of applying the indexes to select route of Chang-Ji freeway.

Valorization of the Use of Calcareous Tuff and Dune Sand in Saharan Road Design

This research objective is to propose a co-valorization of powdered tuff, containing a slight amount of clay and dune sand, by mixing the two substances at different rates such as 0%, 5%, 15%, 25% and 35% of sand. The adapted criteria formulas are those recommended by the technical Saharan road. The results of the proposed study showed that ＂tuff-sand＂ mixtures are denser with a lower optimum water content modified proctor, the fine rate decreases together with the plasticity index, whereas the bearing index （CBR： California bearing ratio test） increases. The intrinsic characteristics, cohesion and sensitivity of mixtures with respect to compactness are almost identical to those oftuffwithout addition. The optimal adapted sand incorporation rate is estimated at 25% at 96% of compactness. Under these conditions, the amount of fines decreases from 40% to an acceptable level of 25% and the plasticity index from 16.2 to 12. The compaction water content decreases by 36% and the CBR （bearing index） increases by 30% and the compressive strength and sensitivity, according to compactness, of the elaborated material are almost identical to those oftuffwithout addition.

Design and implementation --the comprehension of the second stage landscape engineering of the NO.1 Xiangjiang in Changsha

Successful completion of the landscape design work, the implementation on-site is very important besides the prophase design. While in the process of project implementation, what plays an important role is the relationship between persons to persons and persons to things, but not just a simple drawing on the paper. This paper summarized some aspects of project implementation of the NOd Xiangjiang in Changsha, and hopes to achieve the designer＇ s desired results when the landscaping project is completed.

崇明“海上丝绸之路”文化起源之探索

崇明岛地处中国东海,长江入海口,三面环江,一面临海,是仅次于台湾岛、海南岛的中国第三大岛,是世界上最大的河口冲积岛,最大的沙岛。崇明岛成陆已有1300多年历史。公元705年(唐朝神龙元年),在西沙设镇,取名为崇明。"崇"为高,"明"为海阔天空,"崇明"意为高出水面而又平坦宽阔的明净平地。公元1277年(元朝至元十四年),崇明正式建州。现在的上海市崇明县辖崇明、长兴、横沙三岛,总面积1411平方公里,是有名的鱼米之乡。崇明在元代朱清、明代沈廷扬、

建设“海洋强国”需要南海战略

南海是中国海洋强国战略布局的关键海域,推进＂21世纪海上丝绸之路＂的必经路径。中国新一届政府采取了巡航执法、三沙设市、岛礁建设等一系列有力举措,向国际社会展示了维护南海领土主权和海洋权益的坚定意志。但与此同时,南海海域相关声索国围绕海洋资源争夺、岛礁主权、海域划界和通道安全的争端进一步加剧。

三沙市省五届人大代表赴西沙开展集中视察活动

本刊讯(通讯员吉涯)1月5日至7日,三沙市人大常委会组织三沙市省五届人大代表赴西沙开展集中视察活动。十二届全国人大代表、省五届人大代表肖杰,省五届人大代表陆志远、符戆、何少群、吴士存、吴清雄、蔡喜宏等参加了视察。此次集中视察活动的主题是参加三沙市大型交通补给船"三沙1号"轮首航活动、视察三沙基础设施建设情况。活动依序分三部分进行:一是参加"三沙1号"轮首航仪式,视察并了解轮船的建造情况;

海南:探索建立三沙市战略腹地

海南省省长蒋定之1月2 7日表示,三沙设市为海南带来开发开放重大机遇,海南将做好文昌清澜港三沙市后勤补给和交通专用码头、西沙群岛岛际交通码头和船只建造等项目前期准备工作,探索建立三沙市战略腹地,为开发建设提供依托。

三沙市人大常委会首次组织召开代表建议督办工作座谈会

本刊讯（通讯员李锋倪海英）7月3日上午,三沙市人大常委会首次组织召开代表建议督办工作座谈会。这是自三沙设市以来,市人大常委会首次对代表建议进行重点督办,会议由市人大常委会主任符戆主持。会议听取了永乐工委、市经济发展局、市综合执法局和海口事务管理局主要负责人就市一届人大四次会议期间,代表提出的“关于利用鸭公岛泻湖建设旅游景点的建议”等5件重点督办的代表建议办理情况的汇报。

建市两年 再访三沙

祖国南海三沙设市,至今两年了。2012年7月24日,三沙市人民政府正式挂牌。挂牌前,记者即赴永兴岛,采写了《跨海踏访三沙市》一文(刊于本刊2012年第9期)。两年过去了。记者日前再次来到三沙采访:与正式建市前相比,三沙发生了哪些变化?过去的海南渔民在成为三沙市民后,有哪些新的诉求和期待?在南海独特的地理条件和外部发展环境下,三沙又面对着怎样的挑战?

海南三沙市自今年8月1日起可制定地方性法规

海南省五届人大常委会第十六次会议近日审议并决定,三沙市人民代表大会及其常务委员会自2015年8月1日起,开始制定地方性法规。为实施《全国人民代表大会关于修改〈中华人民共和国立法法〉的决定》