唾液舔一舔伤口愈合快

人们发现,有些动物受伤后会舔自己的伤口。另外,拔牙后的创口一般都会比创伤等级相当的皮肤或骨头创伤更快地好转。荷兰研究人员发现,这是因为唾液中有一种蛋白能有效加速溃疡、外伤等伤口的愈合。     

散论个性化教育

人吸收信息的方式是多样的,获得知识的方式的差异决定了教学中存在差异教育和个性化教育。教师要善于用独到的见解、丰富多彩的“语言”,去激发、启迪不同个性不同素质层次的学生,让教育富涵个性,富涵人性,富涵灵性;要开发学生内在的学习潜能,激发其生命的创造冲动,张扬其独特的个性,唤醒其天性中最灵动、最美好的天资。     

研究视野

远程教育的多学科及跨学科研究,似乎引起了业内人士和研究者越来越多的兴趣。的确,作为新兴的教育学科,更由于研究和解决远程教育发展中那些实践和理论问题的需要,远程教育研究不仅要从教育学科中汲取丰富营养,而且相对于通常的教育研究,似乎更应强调要有多学科及跨学科的研究视野。本刊改刊伊始曾提出要逐步形成的特色,首先就是"开阔的视野"。在不久前     

一体式生物膜反应器生物强化反硝化研究

在反应器挂膜启动阶段和运行阶段投加好氧反硝化菌纯培养物,进行生物强化反硝化研究。结果表明,在反应器启动过程中投加好氧反硝化菌,可缩短系统的启动时间;在反应器运行过程中间歇投加好氧反硝化菌能提高系统对污染物的去除效果,同时可增强系统处理的稳定性。     

点击2008年高考化学社会热点题

一、关注奥运,提倡绿色化学例1(山东卷)北京奥运会祥云火炬燃料是丙烷(C3H8),亚特兰大奥运会火炬燃料是丙烯(C3H6)。     

2-（4-甲氧羰基苯基）-5-氨基-6-羟基苯并嚼唑的热分解机理及动力学

采用热重法（TG）测定了2-（4-甲氧羰基苯基）-5-氨基-6-羟基苯并嗯唑（MAB）的热分解过程,测定了MAB及其在热分解过程中不同阶段产物的红外光谱,运用量子化学GAMESS软件计算了MAB分子的键级,推断了MAB的热分解机理,结果表明MAB的热分解过程是一个五阶段过程,起始步骤是甲基酯的分解、根据不同升温速率下的热重曲线计算得到MAB第一阶段热分解反应的表观活化能Eα=157．1kJ·mol^-1和指前因子A=3．715×10^13。     

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.     

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.     

锅炉给水除氧技术的分析与比较

锅炉给水中的溶解氧会腐蚀热力系统的金属。腐蚀产物在锅炉热负荷较高处结成铜铁垢，使传热恶化，甚至造成爆管或在汽轮机高压缸中沉积，使汽轮机效率降低。因此，经过软化或除盐的补给水和凝结水，在进入锅炉之前一般都要进行除氧。只有这样才能确保锅炉的使用寿命，降低事故发生的危害。     

初中生物学六个版本教材中“呼吸作用”实验的比较与改进

1六个版本教材实验的设置呼吸作用的学习,可以帮助学生了解其与光合作用的区别和联系,知道绿色植物是维持生物圈中碳—氧平衡的途径,对提高学生的生命观念和社会责任等生物学学科核心素养具有重要的作用。因此,在人教版、苏教版、河北版、济南版、北师大版和浙教版中都设置了与“呼吸作用”有关的实验,让学生在实验中探究植物呼吸作用现象的同时,掌握呼吸作用的概念和实质,但设置的具体实验又有所差异。