干旱区哈密瓜生长和产量与气候要素的关系

农业是气候变化最敏感的领域之一,气候变化将对农作物产量产生巨大影响.探讨气候变化对干旱区哈密瓜(Cucumis melo L.)生长和产量的影响,明确关键影响气象因子,可为合理有效利用气候资源和防灾减灾提供科学依据.选取1981—2019年哈密瓜生长年气候因子、生长季内气象要素和1999—2019年发育期及产量资料,分...     

Degradation of ofloxacin using peroxymonosulfate activated by nitrogen-rich graphitized carbon microspheres: Structure and performance controllable study

Nitrogen-rich graphitized carbon microspheres (NGCs) with hierarchically porous were constructed by self-assembly. Under different heat treatment conditions, the structure, morphology and properties of NGCs were studied by using multiple characterization techniques. The results showed that the chemical microenvironments (e.g. surface chemistry, degree of graphitization and defective, etc.) and microstructures properties (e.g. morphology, specific surface area, particle size, etc.) could be delicately controlled via thermal carbonization processes. The degradation of ofloxacin (OFLX) by NGCs activated peroxymonosulfate (PMS) was studied systematically. It was found that the synergistic coupling effect between optimum N or O bonding species configuration ratio (graphitic N and C=O) and special microstructure was the main reason for the enhanced catalytic activity of NGC-800 (calcination temperature at 800°C). Electron paramagnetic resonance (EPR) experiments and radical quenching experiments indicated that the hydroxyl (^?OH), sulfate (SO₄^??) and singlet oxygen (¹O₂) were contributors in the NGC-800/PMS systems. Further investigation of the durability of chemical structures and surface active sites revealed that undergo N bonding species configuration reconstruction and cannibalistic oxidation during PMS activation reaction. The used NGC-800 physicochemical properties could be recovered by heat treatment to achieve the ideal catalytic performance. The findings proposed a valuable insight for catalytic performance and controllable design of construction.     

工业管道首次定期检验弯头壁厚减薄分析及检验对策

弯头壁厚减薄在工业管道首次定期检验过程中经常遇到,然而对其进行安全状况等级评定时经常评为4级,与实际不符.本文通过两个检验案例分析产生这种现象的原因,认为弯头的减薄并不都是由使用过程中造成的,而是弯头制造时产生的减薄,这种现象对工业管道的安全状况等级评定产生干扰,最后依据相关规范给检验人员提供解决措施,并有针对性的提出...     

Fe2+和Fe3+在4-氯酚光化学反应中性质的相似性

研究在光照条件下,２０ｍｇ／ｌ４－氯酚＋１ｍｇ／ＬＦｅ＾２＋（体系Ａ）和２０ｇ／Ｌ４－氯酚＋１ｍｇＦｅ＾３＋（体系Ｂ）中Ｆｅ＾２＋和Ｆｅ＾３＋的浓度变化,通过离子色谱手段,在体系Ａ中能够同时检测出Ｆｅ＾２＋,在体系Ｂ中亦能够同时检测到Ｆｅ＾２＋,故Ｆｅ＾２＋和Ｆｅ＾２＋在４－氯酚光化学反应中的性质,表现出相似性。     

空气中异氰酸甲酯的气相色谱测定

用无水乙醇作吸收液,使异氰酸甲酯转化为取代氨基甲酸酯,用氮磷检测器（ＮＰＤ）检测,可消除其他组分的干扰,方法的检测限可达μｇ／Ｌ水平。该方法比目前使用的分光光度法快速、简便、准确。     

实施可持续发展战略,强化对乡镇企业的环境管理

通过对昌吉州乡镇企业环境污染特点的分析,从可持续发展战略的角度提出具有新疆地域特征的乡镇企业环境管理措施。     

Efficient photoreduction of carbon dioxide into carbon-based fuels: a review

Environmental Chemistry Letters - The photocatalytic transformation of carbon dioxide into fuels is viewed as a promising solution to lessen global warming and to enter a circular economy, yet this...     

地震灾区分级和灾害程度排序方法研究——以汶川8.0级地震为例

根据汶川8.0级地震震害评估工作的具体实践,探讨了地震灾区分级和灾害程度排序的方法。通过房屋震害系数、强震加速度观测记录、发震构造、地震地质灾害和场地条件、人口分布及伤亡情况等影响因素来确定受灾程度,以烈度区、统计学方法、速报灾情等来确定灾区分级。     

2008年中国大陆地震灾害损失述评

在列出2008年中国5级以上地震目录的基础上,结合有关省(自治区、直辖市)地震局的地震灾害评估资料,总结出2008年中国大陆地震灾害的主要数据和特性。最后对1990-2008年中国大陆地震灾害的相应数据进行了简要的比较分析。     

溴代甲烷在253.7nm条件下的光氧化机理及其对臭氧光解损耗影响的动力学

本文研究了在２５３．７ｎｍ的紫外光照条件下,ＣＨ３Ｂｒ,ＣＨ２Ｂｒ２以及ＣＨ３Ｂｒ＋Ｏ２／Ｏ３物ＣＨ２Ｂｒ３＋Ｏ２／Ｏ３等体系的光化学反应过程,通过ＦＴＩＲ以及ＵＶ－Ｖｉｓ对产物进行了分析。并提出反应机理予以解释。