Results 11 to 20 of about 1,114 (152)

Field boundary features can stabilise bee populations and the pollination of mass‐flowering crops in rotational systems

open access: yesJournal of Applied Ecology, Volume 58, Issue 10, Page 2287-2304, October 2021., 2021
Field boundary features have an important role in stabilising pollinator populations and pollination service in rotational systems, although maintenance of larger semi‐natural habitat patches may be more effective for stabilising less mobile solitary bee populations.
Emma Gardner   +16 more
wiley   +1 more source

Universal cervical‐length screening to prevent preterm birth in twin pregnancy: cost‐utility analysis

open access: yesUltrasound in Obstetrics &Gynecology, Volume 66, Issue 3, Page 290-297, September 2025.
ABSTRACT Objective The purpose of this cost‐utility analysis was to model the clinical and economic impact of three cervical‐length screening strategies among low‐risk twin pregnancies: two‐step universal screening (at 18–20 and 20–22 weeks), one‐step universal screening (at 18–20 weeks) and no screening.
Y. Khaikin   +4 more
wiley   +1 more source

Seed–Habitat Thermal Interactions Contribute to the Mosaic Distribution Patterns of Invasive Chromolaena odorata and Ageratina adenophora in South Yunnan, China 种子与生境之间的热相互作用促成飞机草和紫茎泽兰在中国云南南部的镶嵌式分布

open access: yesIntegrative Conservation, Volume 4, Issue 1, Page 85-94, March 2025.
Chromolaena odorata and Ageratina adenophora are invasive species in Southern Yunnan, China; they have very differing, yet overlapping, climate niches. Both invaders produce a large number of small pappus‐bearing achenes every year. They grow in, and their seeds are dispersed to, both suitable and marginal habitats.
Bin Wen   +5 more
wiley   +1 more source

Design and Implementation of Assets Management Information System for a Container Wharf [PDF]

open access: yes, 2015
资产管理信息系统主要围绕设备资产、物资管理的核心内容构建,需要管理的设备主要包括港口机械、船舶、电气设备、场内机动车、车辆、车间设备等,需要管理的物资主要包括:机电配件、轮胎、钢材、润滑油、钢丝绳、工索具、水泥、输送带、油料、劳保用品、五金等;相关单位包括若干装卸生产公司及相关辅助生产单位,以及负责十多种大宗物资集中采购的物资管理部门。 采用集中式应用模式,实现对港口相关设备运行、使用、维修保养、状态变更等全寿命周期的全过程管理,实现对港口的设备资产、物资的集中统一管理,实现设备及配件信息的全公司共享 ...
黄桂彬
core  

The enigmatic life history of the bamboo explained as a strategy to arrest succession

open access: yesEcological Monographs, Volume 94, Issue 4, November 2024.
Abstract Bamboos are perennial woody grasses that display an enigmatic mix of traits. Bamboo is highly shade intolerant like early‐successional trees. Without secondary xylem, bamboos cannot continue to grow once they reach a maximum height or replace xylem damaged by hydraulic stress and must instead replace each stem after a few years using ...
Aiyu Zheng, Stephen W. Pacala
wiley   +1 more source

Design and Implementation of Equipments Maintenance System for a Public Security Office [PDF]

open access: yes, 2015
随着我国社会经济的迅猛发展,无论是企业还是国家机关的日常设备总量都在不断增加,日常设备的管理工作面临着更新的要求与挑战。现今的日常办公设备管理应该走出传统的管理模式,向现代的网络模式转变。 本系统采用.NET开发平台和MVC技术框架,系统的前台使用ASP.NET、HTML和JavaScript技术;系统的后台使用C#、ADO.NET和SQLServer2005数据库。系统主要实现设备信息管理、设备监控管理、设备维护管理、供应商管理、设备统计分析和系统信息管理六项功能。 本文根据软件工程的标准流程 ...
冯绍华
core  

Thinking on the whole life cycle management of power grid enterprises [PDF]

open access: yes, 2016
资产管理体系是用来对一家公司的资产、资产集以及资产管理能力进行体系化管控的一系列要素的集合,它的目的是为了保证资产管理目标的达成以及公司战略的实施。随着学界与业界对资产全寿命周期管理这一资产管理体系的研究不断充实与深化,现代企业已经将其视为一种常用的资产管理方式。而电网企业的传统资产管理方法已经不能适应电网企业资产管理的特点,从形式和质量上都面临着许多问题。 在资产管理领域,资产全寿命周期管理是一种有特殊意义的管理理念,安全、效能和周期成本三者的关系通过资产全寿命周期管理的统筹协调,以确保电网安全为前提,
阙玉兰
core  

基于盲数的电力开关设备全寿命周期成本估算

open access: yesGaoya dianqi, 2013
全寿命周期成本(life cycle cost,LCC)理论已应用于许多领域,并且取得良好的社会经济效益。电力开关设备全寿命周期成本分析常采用净现值法,但其中设备的运行维护以及故障成本通常在总成本中占相当大的比重,由于此部分费用是未来发生的费用而且设备实际运行情况是不确定的,采用盲数理论可以处理电力开关设备数据的不确定性,能够克服传统方法过于绝对化的问题。针对GIS和AIS两种开关设备备选方案进行了基于盲数理论的全寿命周期成本分析 ...
张慧娟, 赵庆生, 王英, 李凤霞
doaj  

Study on Green Sustainable Technology of Buildings in south Fujian [PDF]

open access: yes, 2016
闽南地区有石厝、土楼、大木架瓦房、竹楼、风雨桥等诸多历史悠久的地方建筑,旅游发达,宜于居住。但在大多数地区,村镇民居一直尚不被关注,有的已破败不堪。新建的村镇建筑大部分模仿现代城市建筑,采用钢筋混凝土,摈弃了当地千百年来形成的因地制宜的传统建筑形式,继而带来范围更大的资源浪费、生态破坏,得不偿失。 本文主要围绕闽南村镇建筑的绿色可持续发展问题进行探讨,进行了以下工作: 1)对闽南地区几个典型自然村进行实地调研。分别就建筑的结构抗震性能,墙、窗、屋面等围护结构,及能源使用情况进行调查 ...
苏钊艺
core  

Catastrophic mechanism and its prevention and control of seepage deformation and failure of mining rock mass Ⅲ: a review of water retention bulkhead [PDF]

open access: yes, 2023
The types of seepage instability of water retention bulkhead are divided according to the analysis of typical cases of leakage instability of water retention bulkhead in mines in China.
Wanghua SUI
core   +1 more source

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