检索结果-南通市图书馆

Ecological fitness of brown planthopper, Nilaparvata lugens (Stål), to rice nutrient management

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2017年第1期6卷 149-158页

作者： md.Mamunur Rashid Mahbuba Jahan Khandakar S.islam md.Abdul Latif Plant Physiology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh Department of Entomology Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Plant Pathology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh

Introduction:The brown planthopper(BPH),Nilaparvata lugens(Stål)(Hemiptera:Delphacidae),is a notorious insect pest of *** supplementation can alter plant biochemical compositions which may indirectly affect on ecological fitness parameters of its insect ***,few findings are available on nutrient-induced ecological fitness of BPH and relationship of BPH fitness parameters with its host rice plant biochemical ***:We studied the main and interaction effects of nitrogen(N),phosphorus(P),and potassium(K)inputs on BPH fitness,as measured by the following variables:nymph survival,nymphal duration,adult body weight,and its *** planthopper fitness parameters were regressed as function of rice plant(Oryza sativa)biochemical composition.A completely randomized design with four replications in a factorial scheme was used considering N,P,and K levels as ***:Nitrogen application to the host rice plants provided greater survival and enhanced body weight of *** nymphal duration was found to decrease with N subsidy that caused shorter generation time of *** compounds N and soluble protein(SP),total free sugar(TFS),and silicon(Si)content in rice plant tissue correlated strongly with all fitness traits of ***,SP,and TFS associated positively with BPH survival and body weight,while negatively with nymphal *** contrast,Si had negative correlation with BPH survival and body weight,but positive with nymphal *** supplementation to host plant contributed to increase BPH body *** of P with all parameters of BPH were weak except body weight which was highly significant and *** between N and P inputs demonstrated significant effect on BPH body *** of K had no significant effect on BPH survival and *** analysis did not detect significant relationship of BPH fitness parameters with plant tissue content of ***:The res

关键词： Nilaparvata lugens Nutrient management Survival Nymphal duration Body weight

A Model of Teaching and Learning Online in Asian Context

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

开放教育研究 2005年第6期11卷 63-67页

作者： md Kabirul islam Bangladesh Open University Bangladesh

Online teaching and learning practices in Asian universities are different from that in western universities. Western universities give emphasis on student-student interaction for learning. Online courses offered by most Asian universities are a kind of mixed mode that comprised simultaneous face-to-face tutorials and online interaction facility. In this situation most students use the online facility to collect resources and to contact their teachers. The quantity of student-student interaction was sporadic in many courses. So research is needed to improve the situation and create an environment for students where they can learn what peer group interaction is and practice it. This paper has presented a model of teaching and learning online for Asian universities. Possible barriers in teaching and learning situations in Asia and students' abilities have been considered to develop the model.

关键词：亚洲在线学习开放教育现代远程教育教学模式

Determining asphalt surface temperature using weather parameters

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2019年第6期6卷 577-588页

作者： Zafrul H.Khan md Rashadul islam Rafiqul A.Tarefder Department of Civil Engineering University of New MexicoAlbuquerqueNM 87131USA Civil Engineering Technology Colorado State University-PuebloPuebloCO 81001USA

Temperature affects the structural response of asphalt concrete(AC) pavement To evaluate the performance,it is important to accurately predict the pavement surface *** study develops three regression models to determine the surface temperature of an asphalt pavement using field measured data such as air temperature,wind speed,wind direction,relative humidity,and solar *** models namely,24-h model,day-time model and night-time model were developed based on one-year continuous *** weather data were measured from October 2012 to October 2013 at an instrumented pavement section on Interstate I-40 near Albuquerque,New *** developed regression models were validated using October 2014 to June 2015 weather data,which were not used in developing the regression *** temperatures predicted using the developed regression models were then compared to those predicted using the pavement mechanistic-empirical(ME) software’s default *** is observed that the regression models are better predictors of pavement surface temperatures than the ME default models.A parametric study was also performed in this study to identify the effects of weather parameters on the pavement surface temperature *** authors of this study expect that this study will be useful in pavement design especially in cold regions.

关键词： Asphalt pavement Air temperature Surface temperature Wind Relative humidity Solar radiation

Jet Screech Reduction with Perforated Flat Reflector

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2008年第3期17卷 224-227页

作者： md.Tawhidul islam Khan Kenbu Teramoto Shigeru Matsuo Toshiaki Setoguchi Department of Mechanical Engineering Saga University

In the present experimental study, investigations have been carded out to evaluate the performance of the new control technique of jet screech with different perforated flat reflectors. Mainly two types of porous flat reflectors had been used in the experiment. One reflector （reflector-V） designed for placing the reflector surface vertical to the jet axis, when, another type of reflector （reflector-H） designed for placing the reflecting surface horizontal to the jet axis. In both cases the reflectors had been placed at the nozzle （base tube with uniform cross-sectional area） exit. The diameter of the reflector-V was 15D when the diameter of the reflector-H was 10D. The porous area of the reflector-V was 6D and 4.5D for reflector-H where D indicated the diameter of the nozzle exit. The placement of the reflector at the exit of the nozzle reduces the sound pressure at the nozzle exit. Thus the muted sound can not excite the unstable disturbance at the nozzle exit and the loop of the feedback mechanism disappeared, finally, the generation of jet screech be cancelled. The suction space located at the back side of the porous surface of the reflector-V improves the efficiency of the screech control technique. However, in the case of reflector-H, the receptivity process of feedback loop had been controlled by reducing the disturbances at the effective shock fronts as well as at the nozzle exit. The performance of the proposed method was verified with a flat reflector concept and good performance in jet screech suppression has been confirmed in the case of porous reflector.

关键词： Supersonic jet noise screech tone feedback loop noise reduction porous reflector

Measurement of Supersonic Jet Noise with Optical Wave Microphone System

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2005年第4期14卷 352-356页

作者： Masataka KOSAKA Kunisato SETO md.Tawhidul islam KHAN Yoichi NAKAZONO Department of Mechanical Engineering SAGA University1 Honjo-machiSaga-shiSaga 840-8502Japan Department of Mechanical Systems Engineering School of EngineeringKyushu Tokai University9-1-1 TorokuKumamoto 862-8652Japan

An optical wave microphone system is a new technique of sound measurement. This technique has been developed as a new plasma diagnostic technique to measure electron density fluctuations in the nuclear fusion research. Because the sound wave is a pressure or a density fluctuation, it is possible for this technique to measure the sound wave, too. The acoustical characteristics of the optical wave microphone system were examined by using a speaker as a first step. Next, feasibility of this device to measure jet noise was examined. It was found that the optical wave microphone system could measure the jet noise as well as a sound from speaker. Hence the optical wave microphone system can be considered one of the devices equivalent to condenser microphone. Because of these reason, this device is very convenient to scan the acoustic filed through jet flow from the inside to the out side and more preferable for not disturbing the observation field.

关键词： supersonic jet laser sound measurement optical wave microphone system.

Whole Leea macrophylla ethanolic extract normalizes kidney deposits and recovers renal impairments in an ethylene glycol-induced urolithiasis model of rats

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2012年第7期5卷 533-538页

作者： Abu Nasim Nizami md Atiar Rahman Nazim Uddin Ahmed md Shahidul islam Department of Biochemistry and Molecular Biology University of ChittagongChittagong-4331Bangladesh Department of Biochemistry School of BiochemistryGenetics and MicrobiologyUniversity of KwaZulu-NatalDurban 4000South Africa Bangladesh Council of Scientific and Industrial Research(BCSIR) Chittagong-4220Bangladesh

Objective:To investigate the antilithiatic effect of the whole Leea macrophylla(L macrophylla) Roxb(Leeaeeae) ethanol extract in ediylene glycol-induced urolithiasis model of ***: Forty two seven weeks old male wistar albino rats were randomly divided into two major groups namely:preventive(n=18) and therapeutic(n=24).Preventive group was further subdivided into 3 groups of 6 rats namely:preventive control(PC),preventive lithiatic control(PLC) and preventive lithiatic ***(PLLM).Similarly,therapeutic group was also subdivided into 4 groups of 6 rats namely:therapeutic control(TC),therapeutic lithiatic control(TLC).therapeutic lithitatic L macrophylla(TLLM) and therapeutic lithiatic cystone(TLCYS).The lithiasis was induced by 0.75%(v/v) ethylene glycol in the drinking water of all groups except the PC and TC *** urinary ionic parameters such as calcium,inorganic phosphate,oxalate,magnesium & creatinine and renal morphology were altered by ediylene glycol,which were partially recovered by 14 d preventive and almost fully recovered by 28 d therapeutic intervention trials with L macrophylla extract(500 mg/kg BW daily).Results:Significant difference on recovery was observed between preventive and dierapeutic interventional ***-urolithiatic effect of cystone was significantly(P<0.001) higher than extracts.L macrophylla extract was found nontoxic in the acute toxicity ***:The results of this study demonstrated very promising antiurolithiatic effect of *** extract with preventive and therapeutic treatments in this experimental condition.

关键词： Urolithiasis Ethylene glycol Leea macrophylla Urinary parameter Rats

Review of coastal land transformation:Factors,impacts,adaptation strategies,and future scopes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geography and Sustainability 2024年第2期5卷 167-178页

作者： md.Abubakkor Siddik Abu Reza md.Towfiqul islam Dr.Wazed Research and Training Institute Begum Rokeya UniversityRangpur 5404Bangladesh Department of Emergency Management Patuakhali Science and Technology UniversityPatuakhali-8602Bangladesh Department of Disaster Management Begum Rokeya UniversityRangpur 5404Bangladesh Department of Development Studies Daffodil International UniversityDhaka 1216Bangladesh

Coastal land transformation has been identified as a topic of research in many countries around the *** studies have been conducted to determine the causes and impacts of land ***,much less is understood about coupling change detection,factors,impacts,and adaptation strategies for coastal land transformation at a global *** review aims to present a systematic review of global coastal land transformation and its leading research *** 1,741 documents of Scopus and Web of Science,60 studies have been selected using the PRISMA-2020 *** revealed that existing literature included four leading focus areas regarding coastal land transformation:change detection,driving factors,impacts,and adaptation *** focus areas were further analyzed,and it was found that more than 80%of studies used Landsat imagery to detect land *** growth and urbanization were among the major driving factors *** review further identified that about 37%of studies included impact *** studies identified impacts on ecosystems,land surface temperature,migration,water quality,and occupational effects as significant ***,only four studies included adaptation *** review explored the scope of comprehensive research in coastal land transformation,addressing change detection,factor and impact analysis,and mitigation-adaptation *** research also proposes a conceptual framework for comprehensive coastal land transformation *** framework can provide potential decision-making guidance for future studies in coastal land transformation.

关键词： Coastal land transformation Land use and land cover Landsat Population PRISMA

Machine Learning and Artificial Neural Network for Predicting Heart Failure Risk

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第1期44卷 757-775页

作者： Polin Rahman Ahmed rifat md.IftehadAmjad Chy Mohammad Monirujjaman Khan Mehedi Masud Sultan Aljahdali Department of Electrical and Computer Engineering North South UniversityBashundharaDhaka1229Bangladesh Department of Computer Science College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

Heart failure is now widely spread throughout the *** disease affects approximately 48%of the *** is too expensive and also difficult to cure the *** research paper represents machine learning models to predict heart *** fundamental concept is to compare the correctness of various Machine Learning(ML)algorithms and boost algorithms to improve models’accuracy for *** supervised algorithms like K-Nearest Neighbor(KNN),Support Vector Machine(SVM),Decision Trees(DT),Random Forest(RF),Logistic Regression(LR)are considered to achieve the best *** boosting algorithms like Extreme Gradient Boosting(XGBoost)and Cat-Boost are also used to improve the prediction using Artificial Neural Networks(ANN).This research also focuses on data visualization to identify patterns,trends,and outliers in a massive data *** and Scikit-learns are used for *** Flow and Keras,along with Python,are used for ANN model *** DT and RF algorithms achieved the highest accuracy of 95%among the ***,KNN obtained a second height accuracy of 93.33%.XGBoost had a gratified accuracy of 91.67%,SVM,CATBoost,and ANN had an accuracy of 90%,and LR had 88.33%accuracy.

关键词： Heart failure prediction data visualization machine learning k-nearest neighbors support vector machine decision tree random forest logistic regression xgboost and catboost artificial neural network

Growth performance of Avicennia officinalis L. and the effect of spacing on growth and yield of trees planted in the Western coastal belt of Bangladesh

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2014年第4期25卷 835-838页

作者： md. Abdul Quddus Miah Sk. Ahiul islam md. Ahsan Habib md. Golam Moula Plantation Trial Unit Division Bangladesh Forest Research Institute Rupatoli Barisal-8206 Bangladesh

A trial ofAvicennia officinalis L. with five different spacings was conducted in the newly accreted lands along the western coastline （Patuakhali district） of Bangladesh since 1993 to assess growth perform- ance and the effect of spacing on tree growth. Data on tree density, height, diameter, bole height, crown diameter were recorded and ana- lyzed when the stand was 19 years old. Mean height ranged from 12.89-13.52 m and diameter at breast height （dbh） from 26.57-32.16 cm in plots of different spacings. The mean annual height increment ranged from 0,67-0.71 m, mean annual diameter increment from 1.40-1.69 cm and wood volume from 6.02-10.04 ***＇*** in different treatments. Significantly greater diameter （32.16 cm） and wood volume （10.04 ***.a-1） were obtained with wider （2.13 m × 2.13 m） spacing than with closer spacings. But tree growth was unaffected by other spacings. Growth data were also recorded from other .4. officinalis plantations raised by Forest Department （FD） on different islands in Patuakhali and Bhola districts of Bangladesh. At these sites, mean annual height incre- ment ranged from 0.33-0.62 m, mean annual diameter increment from 0.72-1,37 cm and wood volume from 1.55-5.73 m3·ha-1·a·-1. The growth performance of A. offindicated that the newly aecreted lands along the western shoreline may be suitable for raising Avicennia planta- tions for the enrichment of coastal vegetation.

关键词： growth Avicennia officinalis plantation spacing coastal belt