基于推力-引力因素的旅游动机定量评价研究——以黄山为例兼论与韩国国家公园的比较

旅游推力—引力因素是研究旅游行为潜在动机的有效方法。本项研究在大量实地调查的基础上，应用因子分析法（Factor Analysis），以山岳型旅游地黄山为案例区，从推力因素和引力因素两个领域定量分析黄山旅游者旅游动机的潜在特征，确立5个推力公因子和4个引力公因子，同时运用对比分析法。分析了中国黄山与韩国国家公园推力-引力因素的共性和个性。     

Possibilities and options for the Clean Development Mechanism and the Green Investment Scheme in Central and Eastern Europe: Macedonian and Romanian perspectives

Central and Eastern Europe (CEE) is a rapidly changing and developing region which is making the transition to a market based economy. Along with economic reforms, the countries of the region are engaged in substantial environmental reforms, including climate change mitigation activities. Mitigation of, and adaptation to, the consequences of climate change are costly processes. It is therefore of great importance that the national and international mechanisms addressing these problems use methods both environmentally sound and economically efficient. Through two case studies that address the Clean Development Mechanism (CDM) in the Former Yugoslav Republic of Macedonia, and the Green Investment Scheme (GIS) in Romania, this paper explores challenges, related tasks and main problems in the establishment of mechanisms of the Kyoto Protocol in Central and Eastern Europe.     

电感性本质安全电路L/R的选择原则

基于电感性本质安全电路放电电流线性衰减模型,引入最小建弧电压的概念,得到了放电时间不含未知参数的表达式,利用电感电路的本质安全性能判别式,确定了电感电阻比L/R的选取原则.     

中央企业应率先提高安全技术创新能力

中央企业是公有制经济的命脉 ,是国民经济发展的基础。中央企业的安全状况 ,代表了国家形象 ,代表了我国现阶段安全生产所能够达到的最好水平。中央企业具有资金雄厚、设备先进的优势 ,并拥有强大的技术力量和高素质的人才 ,在人、财、物、技术及管理等各方面具有极为有利的优越条件 ,最具安全技术创新的基础和实力。中央企业率先提高安全技术创新能力在推动安全生产科技进步、提高企业本质安全水平方面 ,具有重要的示范作用 ,对于我国的安全生产工作具有举足轻重的影响。笔者首先分析了中央企业安全生产工作现状 ,指出目前中央企业安全技术创新存在的主要问题 ;并列举中石油、中石化、杜邦等世界 5 0 0强企业安全技术创新的成功经验 ;在此基础上 ,进一步提出了中央企业提高安全技术创新能力的 4点建议     

Effects of Metal Mining and Milling on Boundary Waters of Yellowstone National Park, USA

/ Aquatic resources in Soda Butte Creek within Yellowstone National Park, USA, continue to be threatened by heavy metals from historical mining and milling activities that occurred upstream of the park's boundary. This includes the residue of gold, silver, and copper ore mining and processing in the early 1900s near Cooke City, Montana, just downstream of the creek's headwaters. Toxicity tests, using surrogate test species, and analyses of metals in water, sediments, and macroinvertebrate tissue were conducted from 1993 to 1995. Chronic toxicity to test species was greater in the spring than the fall and metal concentrations were elevated in the spring with copper exceeding water quality criteria in 1995. Tests with amphipods using pore water and whole sediment from the creek and copper concentrations in the tissue of macroinvertebrates and fish also suggest that copper is the metal of concern in the watershed. In order to understand current conditions in Soda Butte Creek, heavy metals, especially copper, must be considered important factors in the aquatic and riparian ecosystems within and along the creek extending into Yellowstone National Park.KEY WORDS: Mining; Metals; Toxicity; Biomonitoring; Copper; Yellowstone National Park     

射线探伤质量评定中圆形缺陷的讨论

通过对现行射线标准中圆形缺陷定义的讨论,找出圆形缺陷定义的不足,并分析其产生的原因从而提出修正的意见。     

重庆的国家重点保护植物研究

基于《中国植物红皮书》第一、二册名录，重庆有国家重点保护植物７７种，隶属于４７科，７１属。根据第一批公布的国家重点保护植物，重庆有５２种４９属３２科；其中一级５种，二级２４种，三级２３种，濒危６种，稀有２１种，渐危２５种。水平分布有三个中心，即大巴山南缘地区、武陵山区、大娄山北缘地区。论文最后提出了珍稀濒危植物的保护措施。     

施工现场固体废弃物产生量估算

以新建建筑产生的固体废弃物为研究对象，将改进的材料跟踪法、基于R语言的算法和数据挖掘技术相结合，合理规避了传统方法中数据提取粗糙与数据获取主观性强的问题.同时，通过现场调研获取全国不同区域新建居住建筑的基础数据，进行实证分析.结果表明，施工现场废弃混凝土、废弃钢筋、废弃砌块产生率的典型值分别为3.28%，2.88%，3.33%，代表区间分别为（0.6144%，5.9456%），（0.622%，5.138%），（0.6103%，6.02%）.与已有数据对比发现，我国新建建筑中固体废弃物产生率高于定额损耗率，固废管理水平存在区域性差异，呈"沿海高、内地低"的态势，且整体减量化水平亟待提高.     

A novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) for advanced nitrogen removal from domestic sewage

To achieve advanced nitrogen removal from actual municipal sewage, a novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) was developed. The reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone (R zone) was investigated during the long-term operation. The best performance was obtained at the R zone's Oxidation-Reduction Potential (ORP) of -50±30 mV and hydraulic residence times (HRT) of 1.2 hr. The average effluent COD, TN, NH₄⁺-N and NO₃⁻-N of the R-MAO process were 18.0±2.3, 7.5±0.6, 1.0±0.5 and 4.6±0.4 mg/L, respectively, with the corresponding removal efficiency of COD, TN and NH₄⁺-N were 92.9%±1.0%, 84.1%±1.5% and 97.5%±1.1%. Compared to the sole MAO system, the TN removal efficiency of the R-MAO increased by 10.1%. Besides, under the optimal conditions, the contribution of the R zone in the R-MAO that removal COD, TN, NH₄⁺-N and NO₃⁻-N were 0.36, 0.15, 0.032 and 0.82 g/day. High-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae (5.20%), OLB8 (1.04%) and Ottowia (1.03%) played an important role in denitrification in the R zone. This study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment.     

医院污水处理中ClO_2检测方法的改进研究

本研究用R5法制取ClO2 对医院污水进行消毒处理 ,针对碘量法测定剩余ClO2 时的不足 ,通过控制溶液pH值、加入稳定剂、活化剂和掩蔽剂的方法对其进行改进 ,实现了将溶液中ClO2 、Cl2 、ClO- 2 、ClO- 3区分测定的目的。实验表明 ,改进后的检测方法能够真实准确地反映溶液中剩余的ClO2 。