创造人生的机会

哲人说,对于不利用机会的人,时机又有什么用呢?一个不受精的蛋,是要被时间的浪潮冲刷成废物的。1921年6月2日,电报诞生整整25周年。美国《纽约时报》对这一历史性的发明,发表了一篇简短的社论,其中传达的一个重要信息是:现在人们每年接受的信息量是25年前的50倍。     

错误也精彩——谈小学数学错题资源化

小学数学教学中,教师实施教学活动用到最多的教学资源往往是教材,教材虽然对教师教学活动有较大的作用,但仅仅依靠教材这一教学资源是不够的。在教师进行小学数学教学活动中,学生发生的错误也是一个很重要的教学资源,如果能够将其重视起来,利用好这一教学资源就能够让教师帮助学生及时发现自己的问题,通过及时的查漏补缺促进学生学习能力的进一步发展提升。     

"肉牛-蘑菇-炭"秸秆综合利用"生态单元"设计

为了提高秸秆的资源化利用率,遴选出养牛、种菇和制炭三个有关联的秸秆利用方式,构成循环产业链,根据产业链中消耗的秸秆原料数量确定秸秆供应的农户区面积,使秸秆的产生和资源化利用产销平衡,构成一个"生态单元"."生态单元"由生产中心和农户区两部分组成.生产中心收购农户区的秸秆作为原料,养殖肉牛、种植蘑菇和制炭.养牛、种菇和制炭三个产业环环相扣,并与农业生产形成良性生态链:制炭余热用于菇房加温,牛粪作为种菇培养料,尿液制沼气,沼渣、沼液与蘑菇下脚料还田.按照普通标准确定种菇规模,由种菇需要的牛粪量确定肉牛养殖数量,种菇和养牛剩下的秸秆用来制炭,制炭规模由农户区产生秸秆的数量决定.     

巧借文本资源化解课堂矛盾

那是一节语文公开课,授课教师抽签抽到全校最“差”的班级。听课者除了本校的一些教师外,还有县市的教育专家。主讲人上的是《故乡》一课,这位年轻老师正在想方设法调动学生的学习积极性。在分析“杨二嫂”这一人物形象时,该教师提出一个问题让学生思考:“‘圆规一面愤愤地转过身去’这句话中的‘圆规’是指谁?用‘圆规’来形容这个人你有什么感想?”话音刚落,一个留着长发的学生脱口而     

铁法矿区煤矸石的基本特征及其资源化利用

通过对辽宁铁法矿区煤矸石矿物成分和化学成分的分析，煤矸石部分利用实验的基础上，对煤矸石综合利用的方法进行了评价，并结合研究区煤矸石的基本特征，提出了今后煤矸石资源化利用的途径。     

Polychlorinated dibenzo-p-dioxins and dibenzofurans in flue gas emissions from municipal solid waste incinerators in China

Polychlorinated dibenzo-p-dioxins and furans （PCDD/Fs） emissions in flue gas from two types of municipal solid waste incinerators （MSWIs） most commonly used in China were investigated in this study. The selected incinerators include two grate-type MSWIs： MSWI-A （350 t/d） and MSWI-B 050 t/d）, and two fluidized bed MSWIs： MSWI-C （400 t/d） and MSWI-D （400 t/d）, which are all equipped with semi-dry lime scrubber and bag filter except MSWI-D equipped with cyclone and wet scrubber （WS） as air pollutant control device （APCD）. Results indicated that the emission concentration and the international toxic equivalents （I-TEQs） of the PCDD/Fs from the stacks were in the range of 1.210-10.273 ng/Nm^3 and 0.019-0.201 ng I-TEQ/Nm^3, respectively. They were greatly lower than the emission regulation standard of PCDD/Fs in China （1.0 ng I-TEQ/Nm^3）. However, only the PCDD/Fs emission level from MSWI-C was below 0.1 ng I-TEQ/Nm^3. Although the homologue profiles were distinct, the contributions of the 2,3,7,8-subsituted congeners to the total I-TEQ were similar among all the investigated MSWIs. Two major 2,3,7,8-substituted congeners, 2,3,4,7,8-PeCDF and 1,2,3,7,8-PeCDD, account for 47% and 9% （average values） of the total I-TEQ values, respectively. The correlation between PCDD/Fs levels and composition of flue gas was also discussed.     

Polychlorinated dibenzo-p-dioxins and dibenzofurans in flue gas emissions from municipal solid waste incinerators in China

Polychlorinated dibenzo-p-dioxins and furalls(PCDD/Fs)emissions in flue gas from two types of municipal solid waste incinerators(MSWIs)most commonly used in China were investigated in this study.The selected incinerators include two grate-type MSWIs:MSWl-A(350 t/d)and MSWI-B(150 t/d),and two fluidized bed MSWIs:MSWI-C(400 t/d) and MSWI-D (400 t/d),which are all equipped with semi-dry lime scrubber and bag filter except MSWI-D equipped with cyclone and wet scrubber(WS)as air pollutant conffol device(APCD).Results indicated that the emission concentration and the international toxic equivalents(I-TEQs)of the PCDD/Fs from the stacks were in the range of 1.210～10.273 ng/Nm3 and 0.019～0.201 ngI-TEQ/Nm3,respectively.They were greatly lower than the emission regulation standard of PCDD/FS in China(1.0 ng I-TEQ/Nm3).However,only the PCDD/Fs emission Ievel from MSWI-C Was below 0.1 ng I-TEQ/Nm3.Although the homologue profiles were distinct,the contributions of the 2,3,7,8-subsituted congenem to the total I-TEQ were similar among all the investigated MSWIs.Two major 2,3,7,8-substituted congeners,2,3,4,7,8-PeCDF and 1,2,3,7,8-PeCDD,account for 47% and 9%(average values)of the total I-TEQ values,respectively.The correlation between PCDD/Fs levels and composition of flue gas Was also discussed.     

中国畜禽粪便养分资源总量及替代化肥潜力

明确畜禽粪便资源数量及养分总量,计算其替代化肥潜力,对指导实现化肥零增长和减施增效具有重要意义.本文研究的畜禽种类包括牛、马、驴、骡、猪、羊、家禽和兔,利用排泄系数法估算了1980-2016年中国畜禽粪便的养分资源总量,并计算畜禽粪便替代化肥潜力.结果显示:①1980-2016年畜禽粪便和养分资源总量呈快速增长—稳定发...     

浅析人造板厂剩余物及废弃物资源化利用

根据人造板厂剩余及废弃资源利用情况,浅析人造板厂剩余物及废弃物资源化利用途径,旨在为今后人造板厂在资源综合化利用、降低资源消耗方面具有指导意义,以提高废物的资源化利用水平,从而达到提高企业经济和环境双重效益的目的。