检索结果-南通市图书馆

Journal of Forestry Research 2011年第4期22卷 577-582页

作者： Mahmood hossain Mohammad Raqibul Hasan Siddique md. Saidur Rahman md. Zaber hossain md. Mahedi Hasan Forestry and Wood Technology Discipline Khulna University Khulna - 9208 Bangladesh Soil Science Discipline Khulna University Khulna-9208 Forestry and Wood Technology Discipline Khulna University Khulna- 9208

Azadirachta indica A. Juss, Dalbergia, sissoo Roxb., and Melia azedarach L. are little studied species in nutrient return capabilities from leaf litter decomposition to maintenance of the soil fertility despite their importance in agroforestry practices of Bangladesh. A leaf litter decomposition experiment was conducted using a litterbag teeh7 nique to assess the nutrient reaun efficiency of these species. The de- composition rate of leaf litter was highest for M. azedarach and lowest for D. sissoo. Rainfall and temperature of study sites showed a significant （p〈0.05） positive relationship with the rate of leaf litter decomposition. The highest decay constant was observed for M. azedarach （6.67）. Nitrogen and Phosphorus concentration in leaf litter showed a decreased trend sharply at the end of the first month, whereas rapid decrease of Potassium concentration was reported within 10 days. Conversely, higher concentration of nutrient was observed at the later stages of decomposition. All three species showed a similar pattern of nutrient release （K 〉 N 〉 P） during the decomposition process of leaf litter. Among the studied species, D. sissoo was best in terms of N and P return and A. indica was best in terms of K return.

关键词： agroforestry decay constant decomposition leaf litter andnutrient dynamics

Assessment of Physico-Chemical and Microbial Quality of Sugarcane Juice Sold by Street Vendors in Three Regions of Bangladesh

在线全文

学校读者我要写书评

暂无评论

Antioxidant Defense Mechanisms of Salinity Tolerance in Rice Genotypes

Food and Nutrition Sciences（食品与营养科学） 2024年第4期 263页

作者： Nargis Akter Khan md. Murtaja Reza Linkon Munni Akter md. Alamgir hossain md. Mahbubur Rahman Tayeba Khan md. Abdul Alim md. Esrafil

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Rice science 2017年第3期24卷 155-162页

作者： Mohammad Golam KIBRIA Mahmud hossain Yoshiyuki MURATA md.Anamul HOQUE Department of Soil Science Bangladesh Agricultural University Graduate School of Natural Science and Technology Okayama University

In order to elucidate the role of antioxidant responses in salinity tolerance in rice genotypes under salt stress, experiments were conducted using four rice varieties, including salt-sensitive BRRI dhan 28 and three salt-tolerant varieties BRRI dhan 47, BINA dhan 8 and BINA dhan 10. Thirty-day-old rice seedlings were transplanted into pots. At the active tillering stage(35 d after transplanting), plants were exposed to different salinity levels(0, 20, 40 and 60 mmol/L NaCl). Salt stress caused a significant reduction in growth for all the rice genotypes. Growth reduction was higher in the salt-sensitive genotype than in the salt-tolerant ones, and BINA dhan 10 showed higher salt tolerance in all measured physiological parameters. The reduction in shoot and root biomass was found to be minimal in BINA dhan 10. Chlorophyll content significantly decreased under salt stress except for BINA dhan 10. Proline content significantly increased in salt-tolerant rice genotypes with increased salt concentration, and the highest proline content was obtained from BINA dhan 10 under salt stress. Catalase and ascorbate peroxidase activities significantly decreased in salt-sensitive genotype whereas significantly increased in salt-tolerant ones with increasing salt concentration. However, salt stress significantly decreased guaiacol peroxidase activity in all the rice genotypes irrespective of salt tolerance. K^+/Na^+ ratio also significantly decreased in shoots and roots of all the rice genotypes. The salt-tolerant genotype BINA dhan 10 maintained higher levels of chlorophyll and proline contents as well as catalase and ascorbate peroxidase activities under salt stress, thus, this might be the underlying mechanism for salt tolerance.

关键词： antioxidant enzyme salinity chlorophyll content proline content K+/Na+ ratio rice

The effects of teak monoculture on forest soils: a case study in Bangladesh

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2018年第4期29卷 1100-1109页

作者： md.Abdullah Al Mahmud Mohammad Mahfuzur Rahman Mohammed Kamal hossain Institute of Forestry and Environmental Sciences University of Chittagong

Teak plantations date back to 1871 in Bangladesh. This study was designed to assess how teak monoculture has impacted the soil properties in Bangladesh. Multiple linear regression and correlation matrices were estimated to evaluate these impacts. The means of soil physicochemical properties were compared across various attributes of the plantations. Older plantations accumulated more organic carbon in the soils than the younger plantations. Excessive removal of litter from the forest floor resulted in reduced levels of N, P, K, and other nutrients in the soils. Since bulk density was continuously decreasing deeper into the soil, the penetration of mineral nutrients into the soil was low. Furthermore, moisture content in the topsoil was significantly lower than that in the bottom layers due to the exposed and dry condition of the forest floor under teak plantations. For improving depleted teak plantation soils, teak could be planted with other tree species rather than just in monocultures. In addition, the forest floor could be enriched with leguminous herbs and shrubs to improve soil health in these plantations.

关键词： CHTs Monoculture. Organic carbon Soilnutrients Teak plantation

Energy Fluctuation of Ideal Fermi Gas Trapped under Generic Power Law Potential U=Σ_(i=1)~d c_i|x_i/a_i|^(n_i) in d Dimensions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2016年第4期65卷 465-468页

作者： Mir Mehedi Faruk md.Muktadir Rahman Dwaipayan Debnath md.Sakhawat hossain Himel Theoretical Physics Blackett LaboratoryImperial College Department of Theoretical Physics University of Dhaka Department of Biomedical Physics and Technology University of Dhaka

Energy fluctuation of ideal Fermi gas trapped under generic power law potential U=Σ_(i=1)~d c_i|x_i/a_i|^(n_i) has been calculated in arbitrary *** fluctuation is scrutinized further in the degenerate limit μ>>K_B T with the help of Sommerfeld *** dependence of energy fluctuation on dimensionality and power law potential is studied in *** importantly our general result can not only exactly reproduce the recently published result regarding free and harmonically trapped ideal Fermi gas in d =3 but also can describe the outcome for any power law potential in arbitrary dimension.

关键词： Fermi gas power law potential energy fluctuation

A hybrid deep neural network based prediction of 300 MW coalfired boiler combustion operation condition

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2021年第10期64卷 2300-2311页

作者： HAN ZheZhe HUANG YiZhi LI Jian ZHANG Biao hossain md.Moinul XU ChuanLong Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Engineering and Digital Arts University of KentCanterburyKent CT27NTUK Lomon Billions Group Co. Ltd.Jiaozuo 454191China

In power generation industries,boilers are required to be operated under a range of different conditions to accommodate demands for fuel randomness and energy *** prediction of the combustion operation condition is crucial for an in-depth understanding of boiler performance and maintaining high combustion ***,it is difficult to establish an accurate prediction model based on traditional data-driven methods,which requires prior expert knowledge and a large number of labeled *** overcome these limitations,a novel prediction method for the combustion operation condition based on flame imaging and a hybrid deep neural network is *** proposed hybrid model is a combination of convolutional sparse autoencoder(CSAE)and least support vector machine(LSSVM),i.e.,CSAE-LSSVM,where the convolutional sparse autoencoder with deep architectures is utilized to extract the essential features of flame image,and then essential features are input into the least support vector machine for operation condition prediction.A comprehensive investigation of optimal hyper-parameter and dropout technique is carried out to improve the performance of the *** effectiveness of the proposed model is evaluated by 300 MW tangential coal-fired boiler flame *** prediction accuracy of the proposed hybrid model reaches 98.06%,and its prediction time is 3.06 ms/*** is observed that the proposed model could present a superior performance in comparison to other existing neural network models.

关键词： coal-fired power plant combustion operation condition prediction flame image convolutional sparse autoencoder least support vector machine

Phonon transmission of vacancy disordered armchair silicene nanoribbon

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2021年第8期17卷 454-458页

作者： Ashraful hossain Howlader md.Sherajul Islam Naim Ferdous School of Physics The University of SydneyNew South Wales 2006Australia Department of Electrical and Electronic Engineering Khulna University of Engineering and TechnologyKhulna 9203Bangladesh Department of Electrical and Electronic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj 8100Bangladesh

This work demonstrates the atomic vacancy effects on the phonon properties of armchair silicene nanoribbon in a step by step process for the first *** phonon localization effect figures out the fact that vacancies cause to high-energy phonons become localized,whereas low-energy phonons can easily *** vacancy reduces high-energy phonon transmission severely compared to low-energy *** is also found from phonon density of states that high-frequency phonons soften towards the low-frequency *** simulated phonon bandstructure verifies that most of the phonon branches transform to a nondegenerate state from a degenerate state and shifted toward a lower frequency regime due to the presence of *** overall consequences of atomic vacancies on the phonon thermal conductance disclose the reality that only a few atomic vacancies result in a vital reduction of phonon thermal *** addition,the entropy of the disordered system is investigated.

关键词： phonon vacancy disordered

Impact of International Collaboration (Openness) on Bangladesh Textile Production Capacity,with the Moderating Role of Financial and Government Support

在线全文

学校读者我要写书评

暂无评论

Impact of International Collaboration (Openness) on Banglade...

作者： md Motaher hossain 中原工学院

学位级别：硕士

基于资源基础观和国际组织关系理论,本研究旨在探讨开放对孟加拉国纺织生产能力的影响。本研究的次要目的是分析政府支持和财政支持对开放度与产能关系的调节作用。使用来自153家孟加拉国公司的调查数据和一位关键信息提供者,我们发现... 详细信息

基于资源基础观和国际组织关系理论,本研究旨在探讨开放对孟加拉国纺织生产能力的影响。本研究的次要目的是分析政府支持和财政支持对开放度与产能关系的调节作用。使用来自153家孟加拉国公司的调查数据和一位关键信息提供者,我们发现开放性是提高纺织生产能力的关键驱动力。政府和金融支持在塑造纺织产能方面发挥着调节作用。为了分析这些影响,作者采用了SPSS软件,并采用了回归分析技术。结果表明,纺织部门要提高产能,需要国际合作,回归分析还表明,政府支持和财政支持加强了开放对产能的影响。这项研究具有理论意义,因为它提供了来自欠发达国家孟加拉国的实证证据,进一步将影响从业者更加关注国际合作,提高从业者的生产能力将专注于与国际品牌建立战略联盟。这项研究也将为未来的研究提供基础,更侧重于提取能够提高纺织部门生产能力的因素。

关键词：开放国际合作政府支持、资金支持纺织生产能力

On the QoS for ATM Networks Using a New Buffer Utilization Technique

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 705-706页

作者： md. Julius hossain md. Nurul Huda Department of Computer Science University of Dhaka Dhaka BangladeshDepartment of Computer Science University of Dhaka Dhaka Bangladesh

A buffer sharing scheme need to meet many competing objectives like robustness to changes in traffic conditions, fairness, efficiency, implementation simplicity, etc. Of the existing techniques, Push Out (PO) is optimum in terms of overall cell loss performance, but its delay performance is worse than that of all other methods for the multiple space priority. Another scheme named Dynamic Threshold (DT) is robust and adaptive which has good delay performance. A hybrid technique named Dynamic Threshold wi...

关键词： ATM in on for On the QoS for ATM Networks Using a New Buffer Utilization Technique

The Effect of O2 Plasma Treatment on Digital Printing Properties of PET Packaging Fabric

在线全文

学校读者我要写书评

暂无评论

The Effect of O2 Plasma Treatment on Digital Printing Proper...

作者： md Ali hossain 浙江理工大学

学位级别：硕士

传统织布和无纺布上的奢华图案宠物包装材料正以装饰和保护的目的出现。数码喷墨印花是在织物上制作图案的一种有效方法。但是,在数码喷墨印花中,存在着成色率差、附着性差、分辨率差等问题。这都是因为聚酯纤维具有疏水性和表面光滑性... 详细信息

传统织布和无纺布上的奢华图案宠物包装材料正以装饰和保护的目的出现。数码喷墨印花是在织物上制作图案的一种有效方法。但是,在数码喷墨印花中,存在着成色率差、附着性差、分辨率差等问题。这都是因为聚酯纤维具有疏水性和表面光滑性。因此,有必要在涤纶织物印花前进行一些预处理研究。在纺织品数码喷墨印花中,等离子体作为干法预处理是一种环保处理方法,使涤纶纤维具有亲水性和表面粗糙性。本研究采用两种聚酯织物改善数码喷墨打印性能。一种是100%聚酯平纹织物,另一种是PET无纺布。采用等离子体技术对涤纶平纹织物进行数字转印。针对无纺布的结构特点,采用等离子体对无纺布表面的PA涂层进行预处理,并对数字颜料印花和紫外诱导数字颜料印花进行了改进。以两种方法为目的,研究开发了两种涤纶织物和高档装饰包装材料的良好喷墨打印性能。对平纹织物进行不同时间的氧等离子体处理,找出最佳值,可获得良好的印花性能。测试了印花织物的成色率和染色牢度,考察了等离子体对印花性能的影响。用扫描电镜、X射线能谱、接触角和热重分析等方法对等离子体改性后织物的形貌、表面化学、润湿行为、热变化进行了表征。扫描电镜照片显示表面粗糙度明显增加。XPS显示化学含氧极性基团增加。水接触角测量表明,涤纶织物表面的润湿性增强。这些变化是由等离子体高能粒子引起的,表面粗糙度的增加可能是增强粗糙表面上转移分散染料的主要原因,也可能改变光学反射,从而提高涤纶织物数字转移印花的成色率。热重分析表明,等离子体对涤纶织物的损伤很小,甚至比转移印花的热损伤小。等离子体预处理对转移印花涤纶织物的损伤较小,但等离子体处理对热转移印花织物的损伤程度有所提高。对涤纶无纺布,采用甲醇、无水氯化钙和废旧PA 6长丝为主要原料制备涂层液。利用等离子体使织物具有亲水性,从而提高了尼龙6涂层溶液的吸收,从而在涤纶无纺布上形成了尼龙6涂层。然后在织物上进行数字印花,比较未处理、不同浓度涂层、不同浓度等离子预处理和不同PA 6浓度涂层的K/S值。结果表明,等离子体处理可以使涤纶无纺布由强疏水性改为强亲水性,使其在较低浓度下更容易吸收含有溶解废丝的涂料溶液。PA 6涂层在涤纶无纺布表面也具有亲水性,有利于颜料数码喷墨印花的油墨吸收,使印花的涤纶无纺布具有较高的显色率和清晰的分辨率。因此,等离子处理首先加上PA涂层可以通过喷墨打印来帮助制备高档图案的PET无纺布包装材料,尽管等离子处理和涂层对白度和手感有一定的负面影响。

关键词：氧气等离子体表面改性数码印刷 PA6涂层包装 PET织物 PET无纺布