Experimenting biochemical oxygen demand decay rates of Malaysian river water in a laboratory flume

Nuruzzaman,Abdullah Al-Mamun,Noor Bin Salleh 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.1

Lack of information on the Biochemical Oxygen Demand (BOD) decay rates of river water under the tropical environment has triggered this study with an aim to fill the gap. Raw sewage, treated sewage, river water and tap water were mixed in different proportions to represent river water receiving varying amounts and types of wastewater and fed in a laboratory flume in batch mode. Water samples were recirculated in the flume for 30 h and BOD and Carbonaceous BOD (CBOD) concentrations were measured at least six times. Decay rates were obtained by fitting the measured data in the first order kinetic equation. After conducting 12 experiments, the range of BOD and CBOD decay rates were found to be 0.191 to 0.92 per day and 0.107 to 0.875 per day, respectively. Median decay rates were 0.344 and 0.258 per day for BOD and CBOD, respectively, which are slightly higher than the reported values in literatures. A relationship between CBOD decay rate and BOD decay rate is proposed as kCBOD = 0.8642kBOD - 0.0349 where, kCBOD is CBOD decay rate and kBOD is BOD decay rate. The equation can be useful to extrapolate either of the decay rates when any of the rates is unknown.

Harnessing the Genetic Landscape of Starch Branching Enzyme 1: Genetic Variations and Haplotypes of the SBE1 Gene in Korean rice collection

Nuruzzaman MD,Bhagwat Nawade,Sang-Ho Chu,Yong-Jin Park 한국육종학회 2024 한국육종학회 학술발표회지 Vol.2024 No.6

Effect of Biofertilizers on Vegetative Growth of Okra

M. Nuruzzaman,M. Ashrafuzzaman,M. Zahurul Islam,M. Rafiqul Islam 韓國作物學會 2003 Korean journal of crop science Vol.48 No.2

An experiment was carried out at the Field Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh from March to July, 2001 to investigate the effect of biofertilizers on morpho-physiological characters of okra. The experiment was laid out in a randomized complete block design with four replications. There were nine treatments such as ~textrmT0 (control), ~textrmT1 (Azotobacter biofertilizer), ~textrmT2 (Azospirillum biofertilizer), ~textrmT3 (Azotobacter+Azospirillum biofertilizers), ~textrmT4 (Azotobacter+Cowdung 5 ton ~textrmha-1 ), ~textrmT5 (Azospirillum+Cowdung 5 ton ~textrmha-1 ), ~textrmT6 (Azotobacter+Azospirillum+Cowdung 5 ton ~textrmha-1 ), ~textrmT7 (Cowdung 5 ton ~textrmha-1 ) and ~textrmT8 (60% Nitrogen). The experimental results revealed that significant variations exist among the treatments regarding morphological characters e.g. plant height, number of leaves/plant, stem base diameter, tap root length, and physiological characters like, root dry weight, leaf area index and crop growth rate. Number of leaves/plant, stem base diameter, root length, root dry weight, leaf area index and crop growth rate were found higher in ~textrmT4 , ~textrmT5 , ~textrmT6 and ~textrmT8 than the others. In all the parameters, ~textrmT8 gave the similar result with biofertilizers in combination with cowdung treatments and ~textrmT7 showed identical with ~textrmT0 (control). Biofertilizer treatments had insignificant effect on 1000-seed weight(g). Experimental results mentioned above revealed that morpho-physioligical characters of okra could be modified by the application of biofertilizer+cowdung. However, biofertilizers+Cowdung treatments were comparable to ~textrmT8 (60% Nitrogen) in this study. This suggests that ~textrmT4 or ~textrmT6 or ~textrmT5 were more benificial in environmentally friendly okra cultivation and may be used as an alternative of inorganic nitrogen by saving cost of production and sustaining productivity.

China’s rise, the USA and global order: Contested perspectives and an alternative approach

Mohammed Nuruzzaman 한국외국어대학교 국제지역연구센터 2016 International Area Studies Review Vol.19 No.2

China’s recent economic ascendance and its probable impact on the post-war global order have divided China watchers or sinologists into two broad opposing camps – the school of alarmists and the school of deniers. While the alarmist school exaggerates China’s rise as the beginning of a new Sino-centric world order, the denial school rejects the potential of a rising China to challenge and replace the post-war global order shaped and led by the USA. This review essay maps out the major arguments of both camps, critiques their conceptual and methodological shortcomings, highlights the missing points in the debates on China’s projected economic preeminence and emphasizes an alternative approach to account for the rise of Chinese power. It argues that the differing scholarly views on the impacts of China’s economic rise leave us nowhere close to having definitive ideas about China’s actual power status and impacts. Furthermore, the debates are marked by a general lack of comparative analyses on the global socio-economic and political conditions of China’s rise in the modern context and that of imperial Britain in the 18th and 19th centuries, Germany in the late 19th century and the USA in the late 19th and early 20th centuries. This is where more research is required to clearly understand the rise of China in the contemporary world.

Simple SMS spam filtering on independent mobile phone : Simple SMS spam filtering on independent mobile phone

Taufiq Nuruzzaman, M.,Lee, Changmoo,Abdullah, Mohd. Fikri Azli bin,Choi, Deokjai Wiley (John WileySons) 2012 Security and communication networks Vol.5 No.10

Growth, Protein and Pigment Content of Rice Seedlings under Phosphorus Deprivation Condition

M.Nuruzzaman,M.Ashrafuzzaman,M.ZahurulIslam,M.RafiqulIslam 한국작물학회 2003 Korean journal of crop science Vol.48 No.2

Phosphorus (P) is a macronutrient playing important roles in many plant processes. Significant interest has been devoted to search and utilize genotypic variations in P use efficiency in rice but with little effort to understand its physiological and biochemical bases. In this study, we examined responses to P deprivation of some primary and secondary traits in 3-week-old seedlings of the three genotypes, Sobi-byeo (japonica), Dasan-byeo (japonica x indica) and Palawan (indica). In general, percent weight due to root was increased up to 26%, but amounts of root protein and proteins secreted from roots were decreased by 11 to 19% and 31 to 51 %, respectively, by 3 to 21 days of P deprivation in the three genotypes. Interestingly, however, responses of Palawan to short-term P deprivation were contrasting to those of Dasan-byeo and Sobi-byeo in seedling weight and contents of shoot protein, chlorophyll and anthocyanin. Seedling weight was not decreased, but shoot protein content was decreased in P-deprived seedlings of Palawan. Contents of chlorophyll in leaves and anthocynin in roots were increased in Dasan-byeo and Sobi-byeo, but decreased in Palawan. The results suggest that responses of protein and pigment synthesis to P deficiency are different in modem and traditional varieties and the difference may at least in part be due to the selection for high yield under highly fertilized conditions.

Effect of Biofertilizers on Vegetative Growth of Okra

Ashrafuzzaman, M.,Nuruzzaman, M.,Islam, M.Zahurul,Islam, M.Rafiqul The Korean Society of Crop Science 2003 Korean journal of crop science Vol.48 No.2

An experiment was carried out at the Field Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh from March to July, 2001 to investigate the effect of biofertilizers on morpho-physiological characters of okra. The experiment was laid out in a randomized complete block design with four replications. There were nine treatments such as $\textrm{T}_0$ (control), $\textrm{T}_1$ (Azotobacter biofertilizer), $\textrm{T}_2$ (Azospirillum biofertilizer), $\textrm{T}_3$ (Azotobacter+Azospirillum biofertilizers), $\textrm{T}_4$ (Azotobacter+Cowdung 5 ton $\textrm{ha}^{-1}$), $\textrm{T}_5$ (Azospirillum+Cowdung 5 ton $\textrm{ha}^{-1}$), $\textrm{T}_6$(Azotobacter+Azospirillum+Cowdung 5 ton $\textrm{ha}^{-1}$), $\textrm{T}_7$ (Cowdung 5 ton $\textrm{ha}^{-1}$) and $\textrm{T}_8$ (60% Nitrogen). The experimental results revealed that significant variations exist among the treatments regarding morphological characters e.g. plant height, number of leaves/plant, stem base diameter, tap root length, and physiological characters like, root dry weight, leaf area index and crop growth rate. Number of leaves/plant, stem base diameter, root length, root dry weight, leaf area index and crop growth rate were found higher in $\textrm{T}_4$, $\textrm{T}_5$, $\textrm{T}_6$ and $\textrm{T}_8$ than the others. In all the parameters, $\textrm{T}_8$ gave the similar result with biofertilizers in combination with cowdung treatments and $\textrm{T}_7$ showed identical with $\textrm{T}_0$ (control). Biofertilizer treatments had insignificant effect on 1000-seed weight(g). Experimental results mentioned above revealed that morpho-physioligical characters of okra could be modified by the application of biofertilizer+cowdung. However, biofertilizers+Cowdung treatments were comparable to $\textrm{T}_8$(60% Nitrogen) in this study. This suggests that $\textrm{T}_4$ or $\textrm{T}_6$ or $\textrm{T}_5$ were more benificial in environmentally friendly okra cultivation and may be used as an alternative of inorganic nitrogen by saving cost of production and sustaining productivity.

Low frequency stability study of a three-phase induction motor

M. Bashir Uddin,Md. Nuruzzaman Pramanik,Sheikh Abu Reza 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

A suitable volt/㎐ control strategy is proposed for stability improvement in low frequency operation of induction motors fed from variable voltage and variable frequency supply. The analysis is based on small scale perturbation method applied to the linearized model of state-space equations. Stability analyses are carried out through evaluation of eigen values of the linear model characteristic equation. Stability investigation shows that the simultaneous adjustment of stator voltage and frequency provides a convenient means for maintaining stability of induction motor. The results are verified by standard transient analysis method and demonstrate a very close agreement.

Determination of mortar strength using stone dust as a partially replaced material for cement and sand

Muhit, Imrose B.,Raihan, Muhammad T.,Nuruzzaman, Md. Techno-Press 2014 Advances in concrete construction Vol.2 No.4

Mortar is a masonry product which is matrix of concrete. It consists of binder and fine aggregate and moreover, it is an essential associate in any reinforced structural construction. The strength of mortar is a special concern to the engineer because mortar is responsible to give protection in the outer part of the structure as well as at a brick joint in masonry wall system. The purpose of this research is to investigate the compressive strength and tensile strength of mortar, which are important mechanical properties, by replacing the cement and sand by stone dust. Moreover, to minimize the increasing demand of cement and sand, checking of appropriateness of stone dust as a construction material is necessary to ensure both solid waste minimization and recovery by exchanging stone dust with cement and sand. Stone dust passing by No. 200 sieve, is used as cement replacing material and retained by No. 100 sieve is used for sand replacement. Sand was replaced by stone dust of 15%, 20%, 25%, 30%, 35%, 40%, 45% and 50% by weight of sand while cement was replaced by stone dust of 3%, 5%, and 7% by weight of cement. Test result indicates that, compressive strength of specimen mix with 35% of sand replacing stone dust and 3% of cement replacing stone dust increases 21.33% and 22.76% respectively than the normal mortar specimen at 7 and 28 days while for tensile it increases up to 13.47%. At the end, optimum dose was selected and crack analysis as well as discussion also included.