Efficient utilization of ecological and cultural-tourism resources:Taking Guangzhou Cultural Park as an example

Land space is precious resource and carrier of various economic activities.Ecosystem Product Value Realization and Cultural Tourism is new economic growth point for green and low-carbon development.It is necessary to study how to intensively and efficiently utilize ecological and cultural-tourism resources under"Three zones three lines for land use"(3Z3L),which is basic land space planning policy.However,there are few research and cases due to difficulties of interdisciplinary research.This article adopts the methods of policies research,graphic analysis,and visiting,to study efficient utilization of ecological and cultural-tourism resources.This study found that the development of land spaces of ecology,agriculture,and urban areas is 3D trend,multi-purpose resource utilization can be achieved by improving the utilization efficiency of 3D space and differentiating spatial utilization in different periods.Taking Guangzhou Cultural Park as an example,the research object has improved the efficiency of ecological and cultural-tourism resource utilization by its managements and technology,such as“house under the tree,tree inside the house”.However,there are shortcomings just as planning and protection policies with it.We proposed to optimize the spatial planning and regulations,and improve the protection of overlapping areas of 3Z3L by planning and regulations,improve the utilization efficiency of ecological and cultural-tourism space,meet the urban young people's multiple needs such as culture and ecology in 3D space,use new technologies to improve ecological services quality such as biological methods,strengthen the coordination of multiple management departments with the concept of nature based solutions,develop the“Reversed Transmission Effect”,keep the boundary of urban development strictly.

Factors influencing seed reserve utilization during seedling establishment in maize inbred lines

Strong seedlings are essential for high yield.To explore the foundation of strong seedlings,we investigated various factors influencing the conversion and distribution of seed storage reserves during seedling establishment in maize inbred lines.Three maize inbred lines were used to explore the effects of seed size,seed vigor,illumination duration,temperature,water content,and salt concentration of the seedling medium on the utilization of seed storage reserves during seedling establishment.The results showed that the conversion rate of small seeds was 3.69 to 17.71%higher than that of large seeds.Moreover,prolonged illumination time was conducive to the formation of strong seedlings.However,low temperature,drought stress and salt stress reduced the conversion rate of seed storage reserves and increased the root/shoot ratio.These results could be used to guide field management during seedling emergence and develop improved germplasm with a high conversion rate of seed storage reserves.

Invention and Utilization of Glutinous Sorghum Male Sterile Line 45A with High Starch and High Combining Ability

45A is a glutinous sorghum male sterile line with high starch and high combining ability bred by Rice and Sorghum Institute of Sichuan Academy of Agricultural Sciences in 1998, it is a coeno-species taking non-glutinous maintainer line TL169-239B which bred by Tieling Institute of Agricultural Sciences in 1991 as the female parent and glutinous maintainer line72B bred by the authors＇ institute as the male parent, then, based on the backcross breeding between glutinous single plant chosen from F2 segregation population and Tx623A. There are ten hybrid sorghum varieties which already have been examined and approved by national and above provincial（municipal） level units; the patent of this breeding method has been authorized （the patent number： ZL 2012 1 0129155.6）; 45A is protected by the Right of New Varieties of Plants, MOA, P.R. China （the variety right number： CNA20090576.1）. In this paper, the breeding process of 45A and the characteristics of 45A sterile line and its hybrid sorghum were summed up, what＇s more, the technical key points of high-yielding breed of 45A and the production of hybrid sorghum seeds were introduced, to provide data for further popularizing the sterile line.

Utilizing Dominant Early Maturity Genes of Sterile Line UP-3s in Hybrid Rice Breeding to Avoid High Temperature Season

A new sterile line UP-3s, which carries the Dominant Early Maturity Gene (DEMG), was bred on the farm of University of Arkansas at Pine Bluff (UAPB). UP-3s and two check sterile lines, Jin23-A and Xie-A which do not carry the Dominant Early Maturity Gene, were crossed with a group of different maturity restorer lines, PB-1R, PB-5R,PB11, PB-13R, PB-20, PB-21, PB-22R, and PB-23R. Eighteen new hybrid rice combinations of these crosses were then tested at UAPB in 2012 and 2013. The results showed that panicle differentiation (PD) of hybrids from female parent UP-3s (DEMG) crossed with the 8 male parents, were earlier than the hybrids from female parent Jin23-A or Xie-A crossed with the 8 male parents. The PD of these earlier hybrids was before Jun 25 and heading was before July 20. Early PD and heading avoided the high temperature (over 34&degC) period which usually occurs after July 20 in Arkansas. The yields of these earlier maturity hybrids with female parent UP-3s were higher than those of the late maturity hybrids thatwereF1 progeny of sterile lines Jin23-A or Xie-A (these two female parent checks with non-DEMG). These results showed that the DEMG sterile line UP-3s can be adopted in making crosses with later maturity restorer lines to obtain earlier maturity hybrids to avoid the high temperature period in Arkansas.

A major quantitative trait locus controlling phosphorus utilization efficiency under different phytate-P conditions at vegetative stage in barley

Organic phosphorus（P） is an important component of the soil P pool, and it has been proven to be a potential source of P for plants. The phosphorus utilization efficiency（PUE） and PUE related traits（tiller number（TN）, shoot dry weight（DW）, and root dry weight） under different phytate-P conditions（low phytate-P, 0.05 mmol L^-1 and normal phytate-P, 0.5 mmol L^-1） were investigated using a population consisting of 128 recombinant inbred lines（RILs） at the vegetative stage in barley. The population was derived from a cross between a P-inefficient genotype（Baudin） and a P-efficient genotype（CN4027, a Hordeum spontaneum accession）. A major locus（designated Qpue.sau-3 H） conferring PUE was detected in shoots and roots from the RIL population. The quantitative trait locus（QTL） was mapped on chromosome 3 H and the allele from CN4027 confers high PUE. This locus explained up to 30.3 and 28.4% of the phenotypic variance in shoots under low and normal phytate-P conditions, respectively. It also explains 28.3 and 30.7% of the phenotypic variation in root under the low and normal phytate-P conditions, respectively. Results from this study also showed that TN was not correlated with PUE, and a QTL controlling TN was detected on chromosome 5 H. However, dry weight（DW） was significantly and positively correlated with PUE, and a QTL controlling DW was detected near the Qpue.sau-3 H locus. Based on a covariance analysis, existing data indicated that, although DW may affect PUE, different genes at this locus are likely involved in controlling these two traits.

考虑柔性负荷整形的含源配电线路升级与开关配置综合优化

针对高比例分布式光伏接入造成配电线路重过载的问题,提出一种基于时序互补线路互联和柔性负荷整形的配电线路升级与开关配置综合优化方法。考虑柔性负荷功率调节意愿、线路负载率与功率反送约束,提出柔性负荷整形潜力和线路分段整形需求计算方法。以此为基础,建立了考虑柔性负荷整形的含源配电线路升级与开关配置综合优化双层模型。其中,上层模型以配电线路年规划成本最低、线路段净负荷功率和柔性资源均衡为目标进行线路选型和开关配置,下层模型以线路年运行成本最低为目标进行网络重构和负荷曲线整形,通过上、下层模型交互迭代获得互联线路改造优化方案。上、下层模型分别采用非支配排序遗传算法、二阶锥与大M法进行求解。算例仿真结果表明,所提方法可以提高互联线路资产利用率、规划方案的经济性和可靠性,对互联线路进行柔性负荷整形有利于突破线路负载率50%的限制。

三线建设工业遗产活化利用探究——以泸州茜草坝为例

三线建设时期,泸州茜草坝在全国支援下崛起了关系紧密的长江起重机、长江挖掘机和长江液压件三座大中型工程机械厂,快速形成了泸州的现代化“机械王国”。自1965年以来,三厂历经迁建、合并、分厂、改制。迁厂后,现仅留下长江起重机厂旧址作为城市文化活动区域。就茜草坝三线工业遗址的保护与利用而言,可通过对茜草坝新型工业博物馆建设、“互联网+”远程云教育等方式的综合运用,打造以茜草坝三线工业遗址为中心,泸州市各区县红色、自然景观等为主节点,构建集三线文化、红色文化与自然景观于一体的辐射式跨市域文旅圈,从而促进茜草坝三线工业遗产活化,并以此推动以三线工业遗产为主题的区域旅游事业发展。

城市闲置铁路线活化利用的关键问题和设计策略--基于景观都市主义视角

伴随城市与地铁建设发展,闲置铁路线成为城市高质量建设重要的存量空间资源。文章基于景观都市主义视角,通过对比国内外经典案例,从宏观、中观、微观三个层面对城市闲置铁路线活化利用的三个关键问题进行分析,提出闲置铁路线与城市空间网络共融、边界互通、空间互联的设计策略,并以武汉市武昌生态文化长廊武九铁路段更新利用案例为样本进行实证研究,为闲置铁路线活化利用与城市更新建设提供参考。

5460个三系杂交稻品种的不育系细胞质来源分析

[目的]三系杂交稻育种的50年,也是三系不育系不断创新的50年。厘清三系杂交稻不育系的胞质类型及其主要衍化途径,对于快速确立恢保关系,准确溯源水稻不育系系谱,促进水稻杂种优势的有效利用具有重要作用。[方法]数据来自1974-2023年通过国家和省级审定的三系杂交水稻及其系谱资料。对50年来通过国家或省级审定的三系杂交稻不育胞质进行了系谱梳理,并对主要不育细胞质类型在杂交稻育种中的利用进行了分析。[结果]过去50年来,各级审定的三系杂交稻品种中,不育系胞质信息比较清楚的不育系有966个。根据各自的不育细胞质类型划分成16个类型,分别是野败型、印水型、包台型、D型、K型、冈型、矮败型、红莲型、爪哇稻型、万恢型、东乡野生稻型、广州野生稻型、高州野生稻型、漳浦野生稻型、马协型和Y型。分析结果显示野败型、印水型和包台型不育系数量分列前三位(累计不育系个数占比78.38%,累计选育三系杂交稻品种数占比77.77%),马协型、东乡野生稻型、Y型和高州野生稻型不育系数量分列最后四位(累计不育系个数占比1.55%,累计选育三系杂交稻品种数占比1.15%)。[结论]随着三系杂交稻育种的发展,不育系胞质源的种类和育种利用程度均得到了显著提升,不仅解决了单一不育胞质可能造成的潜在风险,而且丰富了我国三系杂交稻育种中不育细胞质来源的多样性。

历史地段认定标准与保护利用研究——以四川省三线建设文化遗产为例

历史地段是城乡历史文化保护传承体系的新类型。基于四川省历史地段专题研究试点对历史地段的定义与认识,面对四川省数量众多、亟需保护的三线建设历史文化遗产,对四川省三线建设历史文化遗产保护情况进行分析,发现虽然保护工作不断完善,但仍有大量三线建设文化遗产未得到有效保护。15处三线建设历史地段研究样本中纳入工业遗产、爱国主义教育基地的比例不高,面对当前的新形势,提出了具体的保护利用方法:顺应城市发展,确定保护目标;明确保护重点,加强特色营造;编制规划指南,促进活化利用;更新公共空间,提升环境品质;加强保护宣传,彰显文化内涵,以期为历史地段和三线建设文化遗产这一特殊工业遗产的保护与利用提供参考借鉴。

Real-time estimation of the structural utilization level of segmental tunnel lining

Over the last decades,an expansion of the underground network has been taking place to cope with the increasing amount of moving people and freight.As a consequence,it is of vital importance to guarantee the full functionality of the tunnel network by means of preventive maintenance and the monitoring of the tunnel lining state over time.A new method has been developed for the real-time prediction of the utilization level in tunnel segmental linings based on input monitoring data.The new concept is founded on a framework,which encompasses an offline and an online stage.In the former,the generation of feedforward neural networks is accomplished by employing synthetically produced data.Finite element simulations of the lining structure are conducted to analyze the structural response under multiple loading conditions.The scenarios are generated by assuming ranges of variation of the model input parameters to account for the uncertainty due to the not fully determined in situ conditions.Input and target quantities are identified to better assess the structural utilization of the lining.The latter phase consists in the application of the methodological framework on input monitored data,which allows for a real-time prediction of the physical quantities deployed for the estimation of the lining utilization.The approach is validated on a full-scale test of segmental lining,where the predicted quantities are compared with the actual measurements.Finally,it is investigated the influence of artificial noise added to the training data on the overall prediction performances and the benefits along with the limits of the concept are set out.

基于里斯特操作线的新钢2500 m^(3)高炉燃料比的降低

为实现新钢10号高炉的节能降耗,采用绘制Rist操作线的方式,通过实际操作线与理想操作线的对比,计算出煤气利用率和热风温度对焦比的影响,从而指导生产。根据高炉冶炼强度与燃料比的对应关系,确定出最适冶炼强度,并通过逐步扩大风口面积,适当增加风量以达到燃料消耗的最低点;与此同时,逐步增加外围和中间区域的矿石环数,整体扩大焦炭角度,缩小矿石布料平台,并根据煤气分布情况适当扩大矿石批重,发展边缘和中心两股气流。通过优化送风制度和装料制度,高炉煤气利用率提高了1.55%。此外,更换了热风炉预热器以及使用热风炉无扰换炉技术,进一步提高并稳定了风温,热风温度由1184℃上升至1204℃,最终高炉燃料比降至502 kg/t,在同行业处于领先水平。

广西水资源利用上线分析

根据水资源禀赋、经济社会发展合理需要等因素,充分衔接既有水资源管理制度、规划和成果,分析广西水资源利用上线,确定地区用水总量、用水效率、地下水开发利用保护等控制目标,客观评价利用现状,并分区分级划定水资源开发利用管控区,提出相应的管控要求。

电力输配电线路中节能降耗技术运用研究

节能降耗技术主要是通过节约资源和降低能源消耗来达到降低成本的目的。所以,需要明确这一技术的要点,分析其在电力输配电线路中的应用和实施方法,并从电力输配电线路存在的问题出发,探讨节能降耗技术的具体应用,目的在于分析其在电力输配电线路中的应用,以提高能源利用效率、减少能源消耗、推动电力行业的可持续发展。

预制综合管廊U盾架管机施工技术研究与应用

为探索预制综合管廊盾架一体化施工关键技术,提升预制综合管廊机械化施工水平及效率,以雄安新区某综合管廊项目为依托,对U盾架管机开挖、推进、调向等关键技术进行研究。通过构建U盾架管机推进受力模型,探索掌子面预留核心土对推进阻力的影响,得出不同断面管节所需的管节密封压紧力对应的核心土欠挖量,验证U盾架管机采用主顶油缸压紧管节密封的可行性;采用插刀、推板超欠挖进行辅助纠偏,联合主顶油缸、铰接油缸分组协同控制,将掘进姿态控制在±20 mm以内;针对U盾架管机平、纵断面折线转弯工况,采用可调节环宽的楔形过渡桥施工技术,实现最大7.7°水平折线转弯、70‰纵坡折线转弯;同时,对U盾部分与架管机部分在掘进、调向、管节安装过程中的协同施工技术进行研究。现场应用试验表明:U盾架管机施工可以满足预制综合管廊沟槽开挖、设备推进、掘进调向、管节安装等工序的一体化施工需求。

基于现状船闸利用方案的风光枢纽改扩建双线船闸总平面布置

在已有一线船闸枢纽上改扩建双线船闸工程,存在受已有建构筑物限制多、难以有效利用一线船闸结构方案的问题。结合东江航道风光枢纽双线船闸工程,提出2种现状船闸利用思路和相应的平面布置方案:利用老船闸结构为新船闸引航道的方案1和利用老船闸作为施工期围堰的方案2,比选了2种方案在现状结构利用、施工难度、征地面积等方面的优缺点。针对方案2征地面积大的问题,提出大闸曲进直出布置于江侧、小闸直进曲出布置于岸侧的优化措施,充分利用现状船闸的水域和陆域空间,有效减小了征地面积。

青岛市土地利用现状及优化策略分析

近年来,青岛市经济快速发展,城市化脚步愈发紧凑,土地资源面临前所未有的压力。青岛市土地资源利用效率偏低,耕地保护压力较大,生态环境安全受到威胁。城市扩张和工业化需求使得如何实现土地资源的集约化利用成为研究的重中之重。有必要分析青岛市土地利用现状,然后提出土地利用优化策略。总体来说,要推进土地集约化利用,加强耕地保护与修复,划定生态红线,完善政策法规。科学规划、现代技术和法律保障可以提高土地利用效率,促进经济效益、社会效益和生态效益的协调发展,为青岛市未来的可持续发展提供重要支撑。

拖拉机传动箱桁架自动线柔性化改造研究与应用

主要介绍了传动箱桁架自动线共线生产加工多种零件的新工艺,通过对80系列传动箱桁架自动线的电气系统、控制程序及上下料滚道等装置进行技术改造,并增加100系列传动箱加工所需的夹具、刀具等工装,满足100系列后箱加工要求,提高自动线设备利用率,补充100系列后箱产能,形成80和100系列后箱壳体同时共线生产。

输配电及用电工程线路安全运行的问题及其技术探讨

输配电及用电工程线路的安全运行一直是电力行业的关注焦点。线路安全问题涉及电气设备的设计、施工、运行等多个环节,存在着诸多技术挑战。本文旨在探讨线路安全运行中可能出现的问题,并提供相关技术解决方案。通过深入研究电力行业的发展和实践经验,可以为电力系统的线路安全做出贡献,保障供电可靠性,确保人们生产和生活的正常运行。

某双舱管廊总体布局与节点设计优化

以某双舱管廊为例,分析了防火、通风、供配电、排水、逃生、吊装等区间的功能需求,认为应以生产运营需求为导向优化管廊总体布局;在管线入廊、日常巡检、应急逃生等方面,结合流线完整性,对逃生、吊装等节点和区间设计进行了分析,并提出了设计注意事项;针对地下综合管廊口部设计过程中可能出现的水淹、坠落、撤离障碍等安全隐患进行了梳理,简述了细部构造做法的改进思路。该成果可为同类工程改善管廊运营服务质量提供设计参考和借鉴。