检索结果-南通市图书馆

Observed Trends in Extreme Temperature over the Klang Valley, Malaysia

Advances in Atmospheric Sciences 2019年第12期36卷 1355-1370页

作者： Ahmad Norazhar mohd YATIM mohd talib latif Fatimah AHAMAD Md Firoz KHAN mohd Shahrul mohd NADZIR Liew JUNENG Space Science Centre Institute of Climate ChangeUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Faculty of Science and Natural Resources Universiti Malaysia Sabah88400 Kota KinabaluSabahMalaysia School of Environmental and Natural Resource Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Centre for Tropical Climate Change System Institute of Climate ChangeUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Department of Chemistry Faculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia

This study investigates the recent extreme temperature trends across 19 stations in the Klang Valley, Malaysia, over the period 2006^-16. Fourteen extreme index trends were analyzed using the Mann-Kendall non-parametric test, with Sen’s slope as a magnitude estimator. Generally, the annual daily mean temperature, daily mean maximum temperature, and daily mean minimum temperature in the Klang Valley increased significantly, by 0.07°C yr^-1, 0.07°C yr^-1 and 0.08°C yr^-1, respectively. For the warm temperature indices, the results indicated a significant upward trend for the annual maximum of maximum temperature, by 0.09°C yr^-1, and the annual maximum of minimum temperature, by 0.11°C yr^-1. The results for the total number of warm days and warm nights showed significant increasing trends of 5.02 d yr^-1 and 6.92 d yr^-1, respectively. For the cold temperature indices, there were upward trends for the annual minimum of maximum temperature, by 0.09°C yr^-1, and the annual minimum of minimum temperature, by 0.03°C yr^-1, concurrent with the decreases in the total number cold days (TX10P), with -3.80 d yr^-1, and cold nights (TN10P), with -4.33 d yr^-1. The 34°C and 37°C summer days results showed significant upward trends of 4.10 d yr^-1 and 0.25 d yr^-1, respectively. Overall, these findings showed upward warming trends in the Klang Valley, with the minimum temperature rate increasing more than that of the maximum temperature, especially in urban areas.

关键词： climate change extreme temperature trend urban environment tropical area

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lichens reveal the quality of indoor air in Selangor, Malaysia

引用

Ecological Processes 2021年第1期10卷 69-76页

作者： Azlan Abas Sytty Mazian Mazlan mohd talib latif Kadaruddin Aiyub Norhayati Muhammad mohd Shahrul mohd Nadzir Centre for Research in Development Social and Environment(SEEDS)Faculty of Social Sciences and HumanitiesUniversiti Kebangsaan MalaysiaBangiMalaysia. Research Centre for Sustainability Science and Governance Institute of Environment and Development(LESTARI)Universiti Kebangsaan MalaysiaBangiMalaysia. Department of Environmental Science and Natural Resources Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaBangiMalaysia. Panel on Food Technology Faculty of Applied Science and TechnologyUniversiti Tun Hussein Onn MalaysiaBatu PahatMalaysia.

Background:Indoor air quality(IAQ)is a concern in kindergartens as children spend much of their time ***,there is a shortage of biological indicators needed for assessing ***,this study evaluated IAQ using transplanted lichen Usnea misaminensis as a biological ***:Lichen samples,collected from Bukit Larut,Perak,Malaysia,were exposed to indoor and outdoor environments in an urban area(Ummi Aiman Kindergarten)and a rural area(Ummi Qaseh Pelangi Kindergarten)for 2 months during August 15 to October 14,*** concentrations of 12 selected elements and the vitality of the lichens were then ***:Increased concentrations of eleven of the twelve elements deposited in the lichen samples in both urban and rural areas were *** both areas,the element concentrations in the samples from the indoor environment was lower than those from the outdoor environment,and those in the rural area were lower than those from in the urban area,suggesting the impacts of traffic *** vitality of the lichens showed no significant change in indoor environment,compared to that in outdoor environment,indicating that even exposed to indoor environment,the lichens remained effective biological indicators as same as they were in the outdoor ***:Lichens are effective biological indicators for both outdoor and indoor ***,outdoor emissions could influence IAQ,which could be problematic in densely populated areas such as *** measures should be taken.

关键词： Biological indicator Transplanting technique Indoor environment Trace element Usnea misaminensis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Composition and source apportionment of dust fall around a natural lake

引用

Journal of Environmental Sciences 2015年第7期27卷 143-155页

作者： mohd talib latif Sofia Aida Ngah Doreena Dominick Intan Suraya Razak Xinxin Guo Thunwadee Srithawirat Idris Mushrifah School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia Institute for Environment and Development (LESTARI) Universiti Kebangsaan Malaysia Centre for Atmospheric Chemistry University of Wollongong Department of Environmental Engineering Faculty of Engineering and Green Technology Universiti Tunku Abdul Rahman Department of Environmental Science Faculty of Science and Technology Pibulsongkram Rajabhat University Pusat Penyelidikan Tasik Chini (PPTC) Faculty of Science and Technology Universiti Kebangsaan Malaysia

The aim of this study was to determine the source apportionment of dust fall around Lake Chini, Malaysia. Samples were collected monthly between December 2012 and March2013 at seven sampling stations located around Lake Chini. The samples were filtered to separate the dissolved and undissolved solids. The ionic compositions（NO-3, SO2-4, Cl-and NH＋4） were determined using ion chromatography（IC） while major elements（K, Na, Ca and Mg） and trace metals（Zn, Fe, Al, Ni, Mn, Cr, Pb and Cd） were determined using inductively coupled plasma mass spectrometry（ICP-MS）. The results showed that the average concentration of total solids around Lake Chini was 93.49 ± 16.16 mg/（m2·day）. SO2-4, Na and Zn dominated the dissolved portion of the dust fall. The enrichment factors（EF） revealed that the source of the trace metals and major elements in the rain water was anthropogenic, except for Fe. Hierarchical agglomerative cluster analysis（HACA） classified the seven monitoring stations and 16 variables into five groups and three groups respectively. A coupled receptor model, principal component analysis multiple linear regression（PCA-MLR）, revealed that the sources of dust fall in Lake Chini were dominated by agricultural and biomass burning（42%）,followed by the earth＇s crust（28%）, sea spray（16%） and a mixture of soil dust and vehicle emissions（14%）.

关键词： Trace metal Major element Anion Source apportionment Lake Ghini Malaysia

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Composition of carbohydrates, surfactants, major elements and anions in PM2.5 during the 2013 Southeast Asia high pollution episode in Malaysia

引用

Particuology 2018年第2期16卷 119-126页

作者： Shoffian Amin Jaafar mohd talib latif Intan Suraya Razak Nurul Bahiyah Abd Wahid Md Firoz Khan Thunwadee Srithawirat School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Institute for Environment and Development (Lestari) Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Department of Biology Faculty of Science and Mathematics Universiti Pendidikan Sultan ldris 35900 Tanjung Malim Perak Malaysia Centre for Tropical Climate Change System (IKLIM) Institute of Climate Change Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Department of Environmental Science Faculty of Science and Technology Pibulsongkram Rajabhat University Phitsanulok Thailand

Haze episodes have become a major concern in Malaysia over the past few decades and have an increasingly important impact on the country each and every year. During haze episodes from biomass burning in Southeast Asia, particularly from Sumatra, Indonesia, particulate matter PM2.5 is found to be one of the dangerous sources of airborne pollution and is known to seriously affect human health. This study determines the composition of carbohydrates （as levoglucosan）, surfactants, major elements, and anions in PM2.5 during a 2013 haze episode. PM2.5 samples were collected from Universiti Kebangsaan Malaysia, Bangi, using a high volume sampler during a seven-day monitoring campaign during the peak of that year＇s haze episode. PM2.5 concentrations ranged between 14.52 and 160.93 μg/m3, exceeding the 2005 WHO air quality guidelines for PM2.5 （25 μg/m3 for 24-h mean）. The patterns for levoglucosan, surfactants, major elements, and anionic compositions were proportional to the PM2.5 concentrations. Changes in PM2.5 observed on days 3 and 4 were influenced by a combination of meteorological factors, which substantiate the theory that such factors play a pivotal role in haze episodes.

关键词： Aerosol Biomass burning Levoglucosan Surfactant Haze Inorganic composition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Feed-Forward Artificial Neural Network Model for Air Pollutant Index Prediction in the Southern Region of Peninsular Malaysia

引用

Journal of Environmental Protection 2013年第12期4卷 1-10页

作者： Azman Azid Hafizan Juahir mohd talib latif Sharifuddin mohd Zain Mohamad Romizan Osman Department of Chemistry Faculty of Science Universiti Malaya Kuala Lumpur Malaysia East Coast Environmental Research Institute (ESERI) Universiti Sultan Zainal Abidin Gong Badak Campus Kuala Terengganu Malaysia Kulliyyah of Science International Islamic University Malaysia Kuantan Malaysia School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Malaysia

This paper describes the application of principal component analysis (PCA) and artificial neural network (ANN) to predict the air pollutant index (API) within the seven selected Malaysian air monitoring stations in the southern region of Peninsular Malaysia based on seven years database (2005-2011). Feed-forward ANN was used as a prediction method. The feed-forward ANN analysis demonstrated that the rotated principal component scores (RPCs) were the best input parameters to predict API. From the 4 RPCs, only 10 (CO, O3, PM10, NO2, CH4, NmHC, THC, wind direction, humidity and ambient temp) out of 12 prediction variables were the most significant parameters to predict API. The results proved that the ANN method can be applied successfully as tools for decision making and problem solving for better atmospheric management.

关键词： Air Pollutant Index (API) Principal Component Analysis (PCA) Artificial Neural Network (ANN) Rotated Principal Component Scores (RPCs) Feed-Forward ANN

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：