北镇生态市建设的优势与制约因素分析

北镇生态市建设具有基础条件好、生态环境良好和旅游资源丰富等优势;同时也存在一些制约因素,如经济发展水平较低,城市基础设施不完善,农村面源污染较重,以及资金短缺等。通过分析北镇生态市建设的优势和制约因素,以期为其生态市创建工作提供参考。     

室内甲醛污染影响因素的多元回归分析

本文在室内甲醛质量守恒定律基本公式合理推导的基础上,对影响甲醛浓度的主要因素做了正交实验。对实验数据进行多元回归分析,建立室内甲醛浓度预测模型。对模型做检验,检验结果表明,本文的预测模型能较好地预测室内空气中的甲醛浓度。     

固定化藻类去除氮、磷的研究进展

综述了近20年来固定化藻类去除氮、磷的主要研究,归纳分析了相关的研究数据和结果,分别从固定化技术、藻类的生理特征、去除机理、影响因素、生物反应器等方面做了具体介绍.     

非点源污染模型中土壤侵蚀因子研究进展

非点源污染模型是进行非点源污染模拟研究的重要手段，而土壤侵蚀模型是非点源污染模型的基础，土壤侵蚀因子的研究是土壤侵蚀模型的重要基础。本文对国内外主要土壤侵蚀因子研究的成果进行了概述，并指出在今后相当一段时期内，土壤侵蚀因子的研究仍是土壤侵蚀模型研究的重要工作。     

湖北省棉花生产变化影响因子研究

利用灰色关联分析方法,探讨了湖北省近50多年来棉花生产的总体变化趋势及影响湖北省棉花总产量的各项因子。结果表明,棉花单产是影响湖北省棉花总产量的首要因子,播种面积对棉花总产的影响仅次于单产,其制约作用呈上升趋势;自然因素对棉花总产量的影响不断下降;有效灌溉面积对湖北省棉花总产量有逐步增强的制约趋势;农业机械总动力、农业用电量以及化肥施用量对湖北省棉花总产也有着重要的影响。     

机载设备电压尖峰试验测试标准分析

RTCA/DO-160F、GJB151A/152A-97和GJB181-86都涉及了电压尖峰（或电源线尖峰信号传导敏感度）试验项目。在对设备电源部分性能的考核中,电压尖峰（或电源线尖峰信号传导敏感度）试验是重点验证项目。比较分析这三个标准对该项目在测试条件、测试对象和测试方法上的差异,对于机载设备的电压尖峰（或电源线尖峰信号传导敏感度）试验,由于这三个标准的使用范围和适用对象不同,其要求也不尽相同。RTCA/DO-160F根据设备使用场合的保护等级不同而将设备进行分类,要求较为灵活;GJB151A/152A-97则主要是针对机载设备的使用平台提出要求,是军用机载设备基础性的要求;而GJB181-86则主要适用于飞机供电系统与用电设备之间的协调,针对性强,要求较高。     

乡村振兴与乡村旅游协调发展时空演变及驱动因子——以四川省为例

运用熵权法、耦合协调模型和地理探测器分析了2008—2019年四川省乡村振兴与乡村旅游发展水平与耦合协调度的演变特征及驱动因子,总结了各市(州)的发展类型,并提出差异化发展策略。结果表明:①四川省乡村振兴与乡村旅游发展水平呈上升趋势,攀枝花乡村振兴发展缓慢,成都、阿坝州、宜宾是乡村旅游发展的重心。②乡村振兴与乡村旅游呈耦合协调发展趋势,具有显著的空间异质性,以濒临失调和勉强协调为主,呈东南低、北部高的空间格局。③星级农家乐和乡村酒店数量、全社会固定资产投资、国家级非物质文化遗产数、旅游总收入占GDP比重等是影响乡村振兴与乡村旅游协调发展的主要因子。     

Assessing Landowner Activities Related to Birds Across Rural-to-Urban Landscapes

Fluctuations of bird abundances in the Midwest region of the United States have been attributed to such factors as landscape change, habitat fragmentation, depredation, and supplemental feeding. However, no attempt has been made to estimate the collective role of landowner activities that may influence birds across a landscape. To investigate how landowners might influence birds when the majority (> 90%) of land is privately owned, we surveyed all 1694 private domestic landowners living on three breeding bird survey routes (120 km) that represent a continuum of rural-to-urban landscapes in Southeastern Michigan from October through December 2000. Our survey was designed to investigate (1) the proportion of landowners involved in bird feeding, providing bird houses, planting or maintaining vegetation for birds, gardening, landscaping, applying fertilizer, and applying pesticides or herbicides; (2) whether differences existed between urban, suburban, and rural landowner activities; and (3) whether landowners that carried out a given activity were sociodemographically different from those who did not. Of the 968 respondents (58.5% response rate), 912 (94%) carried out at least one of the activities on their land and the average landowner carried out 3.7 activities. A total of 65.6% fed birds, 45.7% provided bird houses, 54.6% planted or maintained vegetation for birds, 72.7% gardened, 72.3% landscaped, 49.3% applied fertilizer, and 25.2% applied pesticides or herbicides. Significant differences existed between the landscapes, with rural landowners having more bird houses and applying pesticides or herbicides in greater frequency. Similarly, urban landowners had a greater density of bird feeders and houses, but planted or maintained vegetation in the lowest frequency. Participation in activities varied by demographic factors, such as age, gender, and occupation. Scaling each activity to all landowners, including nonrespondents, across all landscapes indicates that between 14% and 82% of landowners may be engaged in a particular activity, with application of pesticides or herbicides having the least potential involvement (13.9%–55.4%) and gardening having the greatest potential involvement (40.1%–81.6%). Taken collectively, our results indicate that landowners are both intentionally and unintentionally engaged in a wide range of activities that are likely to influence bird populations.     

挥发性油藏回注气井控因素分析及措施

文章明确了挥发性油藏天然气回注井控的安全环保关键因素;量化了低渗挥发性油藏天然气回注注入能力,确定注入端各节点安全生产压力分布,攻关相关配套工艺设备,实现安全有效注入;开展室内实验和PVT相态拟合,分析注天然气后天然气和原油性质变化规律,创新非混相驱组分数值模拟参数优化方法,开展带人工压裂裂缝的组分数值模拟,精准确定压力场分布,降低计量及监测不准带来的安全隐患;明确注气井气窜影响因素,优化注采参数,抑制油井气窜,降低生产风险,实现井控安全情况下的天然气驱环保高效开发。     

二氧化碳捕集利用与封存项目纳入碳市场的现状、挑战与对策

二氧化碳捕集、利用与封存（CCUS）被认为是燃煤和燃气电厂以及钢铁、水泥和石化等行业实现碳中和的重要技术选项,而碳市场则是重要的市场化减排机制,提高两者的衔接水平,对于我国“双碳”目标的实现具有重要意义。通过总结国际上CCUS项目与碳市场衔接的成功经验,可以为我国CCUS项目与碳市场衔接提供相关借鉴。本文系统梳理了国内外CCUS项目纳入碳市场的立法、激励政策、CCUS减排核算方法学研究情况,识别出我国在CCUS项目与碳市场衔接方面尚存在法律支撑不足、缺乏激励政策以及CCUS项目碳减排核算方法不准确等一系列问题,最后提出多项建议以推动我国CCUS项目与碳市场的衔接：①完善碳市场监管和法律体系,促进CCUS与碳市场衔接;②研判CCUS优先领域,分阶段促进不同行业CCUS项目纳入碳交易市场;③强化政策激励,打通CCUS与碳市场衔接的投融资与成本疏导路径;④分阶段完善碳交易市场建设,充分发挥碳市场金融属性促进CCUS与碳交易市场衔接;⑤建立完善的监测、报告和核查（MRV）标准体系和证书制度,保证CCUS项目减排量核证的准确性和规范性。