油菜蜜源与养蜂生产

我国油菜栽培面积有6000余万亩,分布遍及全国各地,是种植面积最大的蜜源植物。近年来,由于解决了油菜高芥酸和硫代葡萄甙问题,油菜籽销量、栽培面积不断扩大,而且比较集中,有利于养蜂和实现养蜂机械化。四川年产蜜1000万kg左右,油菜花蜂蜜占70％;我国现有蜂600多万群,如将油菜花全部利用起来可养蜂1000多万群,加上其它蜜源,发展养蜂潜力还很大。     

氧化铁皮沟的电气照明

钢材在轧制过程中产生大量的氧化铁皮。落入铁皮沟内的小块氧化铁皮可被高压水冲走,但大块铁皮却须由人工排除。铁皮沟内照明不良是重大隐患,本文对照明装置使用寿命短和维护不良等问题的原因及其解决途径进行了探讨。     

耐火材料企业职业伤害危险因素的病例对照研究

职业伤害是劳动生产中的一个重要问题,据估计,全世界每天要发生1500多万起职业事故,可造成人体伤害,使人残废甚至死亡,同时造成很大的经济损失。职业伤害事故是由多种因素作用造成的,包括人为因素、环境因素、生产组织与管理等方面因素。另外,事故的发生除考虑环境因素外,还存在职员的个体因素,即存在体力、智力、生活习惯、心理特征等个体差异。因此,大约75％的事故发生于25％的人群中。     

创新安全管理 建立长效机制

创新是一个民族进步的灵魂,是一个国家兴旺发达的不竭动力,也是一个企业搞好安全工作的源泉今年是“十一·五”规划的头一年为了起好步,开好局,维护职工利益,促进企业稳定、健康发展,创新安全管理,建立安全长效机制,可取得明显效果,有几个较好管理方法可供参考,兹列于下:一、实行班组安全目标化管理选好班组长,筑牢企业安全生产第一道防线。在选班组长时,坚持思想素质好、业务技术好、品德好、民主作风好,择优选取。二、以保持共产党员先进性教育为契机,充分发挥“一个党支部一个战斗堡垒、一个党员领导干部一根标杆、一个党员一面旗帜”作…     

瘦西湖水质时空特征及综合控制对策措施研究

分析了瘦西湖水质时空特征和富营养成因,提出浅湖型湖泊富营养化治理需加强区域水系水质管理,提出"防、活、治、修"综合治理措施.     

海平面变化及其对海洋生态环境的影响

世界约有一半人口生活在距海岸线50公里以内的沿岸地区,人口密度平均较内陆高出10倍,因此海平面变化与人类生活和社会经济发展休戚相关.随着人类活动对海洋、大气系统影响的迅速扩大,全球气候异常、海平面变化已经成为全球性重大环境问题.     

生活垃圾焚烧炉污染物排放分析

简要介绍了生活垃圾焚烧妒的炉型、烟气净化技术的选择、飞灰固化的常用处置方式,通过分析不同生活垃圾焚烧炉的烟气监测数据,说明生活垃圾焚烧炉烟气排放能够达到GB 18485-2001<生活垃圾焚烧污染控制标准>相应标准限值,有些烟气污染物甚至能达到欧盟排放标准.     

皖南新元古代花岗闪长岩地球化学特征及构造环境

皖南新元古代花岗闪长岩沿祁门-歙县-三阳深断裂呈串珠状出露。本文在对其岩石学、地球化学细致分析的基础上,探讨了岩体的岩石成因和产出环境。皖南新元古代花岗闪长岩主要由石英、钾长石和斜长石组成,普遍含富铝矿物黑云母和堇青石,副矿物包括锆石、磷灰石、钛铁矿、独居石、磷钇矿、极少的磁铁矿等。地球化学分析数据显示,岩石总体具高硅、高钾、高铝和低钠、低镁、低钙的特征;岩石富碱(ALK=6.63%),高K2O/Na2O比值(1.33)。里特曼指数σ为0.8～2.91,碱度率AR为1.56～3.14,属高钾钙碱性系列。岩石铝饱和指数(A/CNK=1.31)大于1.1,具强过铝质S型花岗岩的特征。岩石稀土元素呈轻稀土富集、重稀土亏损的特征,ΣLREE/ΣHREE比值为5.36～8.36,具较强的负铕异常(δEu=0.39～0.7),配分模式为右倾"V"字形态;微量元素明显富集Rb、Th而亏损Ba、Nb、Ta、Sr等,为低Sr高Yb型花岗岩。地球化学特征显示其岩浆源于围岩-中元古代牛屋组浅变质千枚岩的部分熔融,反映陆-陆碰撞挤压造山环境,为晋宁运动晚期华夏板块向北俯冲与扬子板块碰撞造山的火山弧产物。     

Temporal and spatial evolution characteristics of sunshine duration over Qinghai-Tibet Plateau from 1961 to 2020北大核心CSCD

Based on observation data of daily sunshine duration from 1961 to 2020 at 175 meteorological observation stations over Qinghai-Tibet Plateau and its surrounding areas, spatial transformation analysis, climate trend analysis and M-K mutation test were used to analyze the temporal and spatial variation characteristics of the seasonal and annual sunshine duration in the region in the last 60 years. The results show that (1) annual average sunshine duration was 2 323 h, the maximum was 3 487 h in Gaer, Tibet, and the minimum was 771 h in Ya'an, Sichuan. The high-value areas were mostly located in western Tibet, northern Qinghai, western Gansu, and Xinjiang, and the low-value areas were mostly located in Nyingchi in Tibet, the mountainous area on the western edge of the Sichuan Basin, and northwestern Yunnan. The highest sunshine duration was recorded in winter (631 h), and the lowest was recorded in autumn (555 h) among the four seasons. (2) The average decrease in annual sunshine duration was 10.27 h/10 a. The largest rates of decrease were mainly in Gannan of Gansu and Ganzi of Sichuan, with the largest rate of decrease of 130 h/10 a. The areas with large rates of increase were mainly in Hotan area of Xinjiang, Liangshan of Sichuan and Lhasa of Tibet, with the largest increase of 61 h/10 a. Among the four seasons, spring exhibited an upward trend, and the remainder exhibited a downward trend. (3) Before 2017, the annual sunshine duration increased but declined after 2017. Spring sunshine duration had the largest number of mutation years, and the earliest mutation time was 1963. Winter had the fewest number of mutation years and the latest mutation time occurred in 2015. In summary, the annual and seasonal sunshine duration of Qinghai-Tibet Plateau vary greatly in space, but with the general characteristics of more sunshine in the northwest and less in the southeast, and sunshine hours were mainly decreasing, with 2017 as a mutation point of annual sunshine duration. Most areas of Qinghai-Tibet Plateau have great potential for photosynthetic production and are suitable for the development of light-loving plants and high-density planting. Shade-loving or shade-tolerant plants, including tea, are suitable for development in remote mountainous areas with low sunshine values in the western part of the basin, including Ya’an, Sichuan, and other areas, such as Medog, Tibet. © 2022 Science Press. All rights reserved.