|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 基于自钻式旁压仪的残积土原位力学特性试验研究显示文摘残积土属区域性特殊土,准确获得其力学性质指标是各类工程场地地基处治及承载力评价的必要条件。针对典型花岗岩残积土层,在20 m深度范围内开展自钻式旁压试验,获得表征土体原始水平应力、强度与刚度的相关指标,类比分析深度与水平方向土体力学性质的差异性,并论证了土体刚度在不同应变水平下的衰减规律。结果表明,该场地浅层土体刚强度指标差异性较大,存在明显的风化壳,导致剪切模量及变形参数沿深度呈先减小后增大的趋势;土体割线剪切模量Gs,切线剪切模量Gt随剪应变变化关系具有明显的非线性特性,在小应变范围(γc≤0.3%)内Gs,Gt快速衰减,在γc=2.0%~3.0%时,趋于平稳,采用非线性分析方法得到的模量值较为合理,认为在该类场地工程设计中,剪切模量的选取宜基于自钻式旁压试验结果,根据不同应变水平确定,采用线性割线法得到的剪切模量Gur偏于冒险。同时发现,小应变时剪切模量值相对于土体差异较为敏感,为准确获得土性参数,可适当增加浅层土体测试数量。 | 尹松 孔令伟 张先伟 Hossain Md Sayem 樊友杰 | 2016 | 岩土工程学报2016，38，4： | 22 |
| 2 | Biochar and its importance on nutrient dynamics in soil and plant显示文摘Biochar,an environmentally friendly soil conditioner,is produced using several thermochemical processes.It has unique characteristics like high surface area,porosity,and surface charges.This paper reviews the fertilizer value of biochar,and its effects on soil properties,and nutrient use efficiency of crops.Biochar serves as an important source of plant nutrients,especially nitrogen in biochar produced from manures and wastes at low temperature(≤400℃).The phosphorus,potassium,and other nutrient contents are higher in manure/waste biochars than those in crop residues and woody biochars.The nutrient contents and pH of biochar are positively correlated with pyrolysis temperature,except for nitrogen content.Biochar improves the nutrient retention capacity of soil,which depends on porosity and surface charge of biochar.Biochar increases nitrogen retention in soil by reducing leaching and gaseous loss,and also increases phosphorus availability by decreasing the leaching process in soil.However,for potassium and other nutrients,biochar shows inconsistent(positive and negative)impacts on soil.After addition of biochar,porosity,aggregate stability,and amount of water held in soil increase and bulk density decreases.Mostly,biochar increases soil pH and,thus,influences nutrient availability for plants.Biochar also alters soil biological properties by increasing microbial populations,enzyme activity,soil respiration,and microbial biomass.Finally,nutrient use efficiency and nutrient uptake improve with the application of biochar to soil.Thus,biochar can be a potential nutrient reservoir for plants and a good amendment to improve soil properties. | Md Zahangir Hossain Md Mezbaul Bahar Binoy Sarkar Scott Wilfred Donne Young Sik Ok Kumuduni Niroshika Palansooriya Mary Beth Kirkham Saikat Chowdhury Nanthi Bolan | 2020 | Biochar2020，2，4： | 15 |
| 3 | Biochar:An Emerging Panacea for Remediation of Soil Contaminants from Mining,Industry and Sewage Wastes显示文摘Mine tailings, waste rock piles, acid mine drainage, industrial wastewater, and sewage sludge have contaminated a vast area of cultivable and fallow lands, with a consequence of deterioration of soil and water quality and watercourses due to the erosion of contaminated soils for absence of vegetative cover. High concentrations of toxic elements, organic contaminants, acidic soils, and harsh climatic conditions have made it difficult to re-establish vegetation and produce crops there. Recently, a significant body of work has focussed on the suitability and potentiality of biochar as a soil remediation tool that increases seed emergence, soil and crop productivity, above ground biomass, and vegetation cover on mine tailings, waste rock piles, and industrial and sewage wastecontaminated soils by increasing soil nutrients and water-holding capacity, amelioration of soil acidity, and stimulation of microbial diversity and functions. This review addresses: i) the functional properties of biochar, and microbial cycling of nutrients in soil; ii)bioremediation, especially phytoremediation of mine tailings, industrial waste, sewage sludge, and contaminated soil using biochar; iii)impact of biochar on reduction of acid production, acid mine drainage treatment, and geochemical dynamics in mine tailings; and iv)treatment of metal and organic contaminants in soils using biochar, and restoration of degraded land. | Hossain M.ANAWAR Farjana AKTER Zakaria M.SOLAIMAN Vladimir STREZOV | 2015 | Pedosphere2015，25，5： | 13 |
| 4 | 不同水肥条件对温室黄瓜生长及产量品质的影响显示文摘为寻找利于黄瓜高产优质的合理灌水施肥组合,在水肥一体化条件下探究不同灌水下限、施氮量、施钾量对黄瓜生长、产量和品质的影响,对于灌溉下限分别设置高水(W3:85%田持)、中水(W2:75%田持)、低水(W1:65%田持)三个水平;对于施肥量分别设置高氮(N3:468kg·hm-2)、中氮(N2:360kg·hm-2)、低氮(N1:252kg·hm-2)和高钾(K3:702kg·hm-2)、中钾(K2:540kg·hm-2)、低钾(K1:378kg·hm-2)各三个水平,为缩小试验规模,采用正交试验方法对三因素进行组合试验。试验结果表明:提高灌水下限,可以增加植株鲜重,W3灌溉水平下单株鲜重平均达到561.3g;大量施入氮肥虽不利于茎的生长但对于叶片生长有促进作用,N3处理叶片鲜重最大(225.6g);钾肥施入量对生长发育无显著影响。综合比较W3N2K2水肥组合最有利于植株生长。灌水下限、施氮量和施钾量均对黄瓜产量具有显著影响,随着灌水下限的提高黄瓜增产明显,W3处理产量平均达到131.6t·hm-2;随着氮肥钾肥施入量的增加黄瓜产量呈现先增加后减少的趋势;黄瓜全生育期耗水量与灌溉量呈正比关系,不同灌溉处理灌水量与耗水量关系曲线K值分别为1.53,1.04,0.79,随着灌溉量的增加耗水量逐渐趋于平稳;鲜果品质随着灌水下限的提高而降低但与钾肥施用量呈正相关关系,经评分法分析,W1N2K3水肥组合可以得到最优品质。通过模型精确预测,得出在灌水下限为田持的85%,施氮量381.3kg·hm-2,施钾量600.7kg·hm-2时可以得到最高产量,同时品质较为优质,预测产量为136.14t·hm-2,为最佳灌水下限与肥料施用量。 | 王丽学 李振华 姜熙 孟维忠 陈伟 SHAIKH Abdullah AI Mamun Hossain | 2019 | 沈阳农业大学学报2019，50，1： | 13 |
| 5 | Vegetative propagation of Litsea monopetala, a wild tropical medicinal plant: Effects of indole-3-butyric acid (IBA) on stem cuttings显示文摘In this study we investigated the rooting ability and the growth performance of juvenile single-node leafy stem cuttings of Litsea monopetala (Roxb) Pers. collected from two mature mother trees preserved in the hill forest of Chittagong district, Bangladesh. The rooting ability of cuttings was studied under 0%, 0.1%, 0.2% and 0.4% indole-3-butyric acid (IBA) treatments. Significantly better rooting response (p ≤ 0.05) was observed with 0.1% IBA compared to control (0% IBA). The mean number of roots and the length of the longest root of cuttings in different treatments showed no significant difference (p≤0.05). After transfer into polythene bags from non-mist propagator, rooted cuttings treated with 0%, 0.1% and 0.2% IBA demonstrated the highest (100 ± 0.00%) survival capacity. The mean number of shoots developed in cuttings in the polythene bags in first three weeks varied significantly (p≤0.05) among the treatments. Effects of three fertilizer treatments, viz. T0 (no fertilizer), T1 (10g Urea, 20g TSP, 10g MOP dissolved in 1 L water) and T2 (10g Urea, 20g TSP, 10g MOP dissolved in 2 L water) on initial growth ofstecklings were also measured over a 90-days period. The increment of leaf area of stecklings was significantly higher (p≤0.05) under T0 compared with that under T1 and T2 while the increment of stem length, collar diameter and root biomass varied insignificantly among different fertilizer treatments. The results suggest that rooting juvenile single-node leafy stem cuttings could be an effective mean of regenerating L. monopetala. The application of 0.1% IBA concentration is recommended for rooting of juvenile leafy stem cuttings and application of fertilizer appeared unnecessary for the subsequent growth of stecklings in polythene bags. | Tarit Kumar Baul Mohammad Mosharraf Hossain Mohammad Mezbahuddin Mohammed Mohiuddin | 2011 | Journal of Forestry Research2011，22，3： | 12 |
| 6 | 桉树叶凋落物对树林和农作物的他感作用(英文)显示文摘调查了土壤中配以不同量的桉树叶凋落物对温室条件生长的常见作物和树木的他感作用。用于生物鉴定物种包括三种常见农作物(Falen(Vigna unguiculata),Chickpea(Cicer arietinum),Arhor(Cajanus cajan))和两种广泛栽植树种(Sadakoroi(Albizia procera)and Ipil ipil(Leucaena leucocephala))。实验材料在室温(27°C)条件下用托盘培养,混以不同剂量的凋落物的土壤培养材料的各项指标与对照比较。结果表明,桉树凋落叶诱导抑制作用,且该作用依赖于萃取物和凋落物浓度,受作用物种类型。实验用材料的剂量越高,抑制作用则越高,反之,亦然。尽管生物鉴定种均受到抑制,其中仍有表现较好的种。基于本实验结果,推荐Vigna unguiculata,Cicer arietinum种于复合农林系统中。在混交林中,Leucaena leucochephala和Albizia procera比较,优先选择Leucaena leucochephala。图4表7参39。 | Romel Ahmed A. T. M. Rafiqul Hoque Mohammed Kamal Hossain | 2008 | Journal of Forestry Research2008，19，1： | 11 |
| 7 | 海洋沉积土动剪切模量与阻尼比的试验研究显示文摘动剪切模量和阻尼比是工程场地地震安全性评价及地基动力反应分析的重要动力学参数。为评价某海域海洋土的动力学特性,对10.3~84.2 m深度范围内的海底淤泥质粉质黏土、粉砂及细砂开展共振柱试验。利用双对数模型建立了最大动剪切模量随上覆压力的递增关系。研究发现,现有规范的剪切模量比与阻尼比的推荐取值并不适用于海洋沉积土,即使考虑借鉴以往研究成果也必须将其限制在一定的应变范围,并应考虑土体的天然应力状态取值。利用马丁-达维登科夫(Martin-Davidenkov)模型及阻尼比与剪应变的经验关系建立了剪切模量比和阻尼比随剪应变的变化规律,并由此提出了适用于海洋沉积土的5×10-6~10-3应变范围内剪切模量比及阻尼比的推荐值。研究成果可为海洋工程场地的设计、施工及抗震分析提供技术参考依据。 | 尹松 张先伟 孔令伟 Hossain Md Sayem | 2015 | 岩土力学2015，36，S1： | 11 |
| 8 | Antioxidant Defense Mechanisms of Salinity Tolerance in Rice Genotypes显示文摘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. | Mohammad Golam KIBRIA Mahmud HOSSAIN Yoshiyuki MURATA Md.Anamul HOQUE | 2017 | Rice science2017，24，3： | 10 |
| 9 | Application of Biochars for Soil Constraints:Challenges and Solutions显示文摘Biochar addition to soil is currently being considered as a means to sequester carbon while simultaneously improving soil health,soil fertility and agronomic benefits. The focus of this special issue is on current research on the effects of biochar application to soil for overcoming diverse soil constraints and recommending further research relating to biochar application to soil. The biochar research has progressed considerably with important key findings on agronomic benefits, carbon sequestration, greenhouse gas emissions, soil acidity, soil fertility, soil health, soil salinity, etc., but more research is required before definitive recommendations can be made to end-users regarding the effects of biochar application across a range of soils, climates and land management practices. | Zakaria M.SOLAIMAN Hossain M.ANAWAR | 2015 | Pedosphere2015，25，5： | 10 |
| 10 | In vitro total phenolics,flavonoids contents and antioxidant activity of essential oil,various organic extracts from the leaves of tropical medicinal plant Tetrastigma from Sabah显示文摘Objective:To detect the in vitro total phenolics,flavonoids contents and antioxidant activity of essential oil,various organic extracts from the leaves of tropical medicinal plant Tetrastigma from Sabah.Methods:The dry powder leaves of Tetrastigma were extracted with different organic solvent such as hexane.ethyl acetate,chloroform,butanol and aqueous methanol.The total phenolic and total flavonoids contents of the essential oil and various organic extracts such as hexane,ethyl acetate,chloroform,butanol and aqueous ethanol were determined by Folin-Ciocalteu method and the assayed antioxidant activity was determined in vitro models such as antioxidant capacity by radical scavenging activity usingα,α-diphenyl-β-picrylhydrazyl (DPPH) method.Results:The total phenolic contents of the essential oil and different extracts as gallic acid equivalents were found to be highest in methanol extract(386.22 mg/g) followed by ethyl acetate(190.89 mg/g).chloroform(175.89 mg/g).hexane(173.44 mg/g).and Imtanol extract (131.72 mg/g) and the phenolic contents not detected in essential oil.The antioxidant capacity of the essential oil and different extracts as ascorbic acid standard was in the order of methanol extract>ethyl acetate extract>chloroform>butanol>hexane extract also the antioxidant activity was not detected in essential oil.Conclusions:The findings show that the extent of antioxidant activity of the essential oil and all extracts are in accordance with the amount of phenolics present in that extract.Leaves of Tetrastigma being rich in phenolics may provide a good source of antioxidant. | M Amzad Hossain Muhammad Dawood Shah Charles Gnanaraj Muhammad Iqbal | 2011 | Asian Pacific Journal of Tropical Medicine2011，4，9： | 9 |
| 11 | Effects of rainfall patterns on runoff and rainfall-induced erosion显示文摘Rainfall-induced erosion involves the detachment of soil particles by raindrop impact and their transport by the combined action of the shallow surface runoff and raindrop impact.Although temporal variation in rainfall intensity(pattern)during natural rainstorms is a common phenomenon,the available information is inadequate to understand its effects on runoff and rainfall-induced erosion processes.To address this issue,four simulated rainfall patterns(constant,increasing,decreasing,and increasing-decreasing)with the same total kinetic energy were designed.Two soil types(sandy and sandy loam)were subjected to simulated rainfall using 15 cm×30 cm long detachment trays under infiltration conditions.For each simulation,runoff and sediment concentration were sampled at regular intervals.No obvious difference was observed in runoff across the two soil types,but there were significant differences in soil losses among the different rainfall patterns and stages.For varying-intensity rainfall patterns,the dominant sediment transport mechanism was not only influenced by raindrop detachment but also was affected by raindrop-induced shallow flow transport.Moreover,the efficiency of equations that predict the interrill erosion rate increased when the integrated raindrop impact and surface runoff rate were applied.Although the processes of interrill erosion are complex,the findings in this study may provide useful insight for developing models that predict the effects of rainfall pattern on runoff and erosion. | Morteza Alavinia Farzin Nasiri Saleh Hossain Asadi | 2019 | International Journal of Sediment Research2019，34，3： | 9 |
| 12 | 典型绿色建筑评价体系室内环境指标对比分析显示文摘对典型绿色建筑评价体系的室内环境评价指标进行对比分析,包括对LEED、BREEAM和中国绿色建筑评价体系中室内环境部分的指标内容、权重体系、达标要求的对比。通过对比分析发现,室内空气品质、光环境、热湿环境、声环境是室内环境质量的主要组成部分,其中,室内空气品质在LEED体系的室内环境部分占大部分内容和分值比重,而在中国绿建体系和BREEAM体系中,四类组成部分的指标数量和分值的分布则相对均匀。虽然中国绿建体系不具有LEED的分值体系和BREEAM的一级权重体系,但其相对众多的控制项以及对应不同绿建等级的室内环境达标项数要求却独具特色。此外,通过对比分析出了三类指标体系所共同关注的室内环境评价的重要内容。 | 杨心诚 刘猛 Uzzal Hossain | 2013 | 土木建筑与环境工程2013，35，S1： | 9 |
| 13 | Rice Aroma: A Natural Gift Comes with Price and the Way Forward显示文摘Aromatic rice belongs to a small but important sub-group of rice,which is highly regarded for its excellent aroma and superior grain quality.Aromatic rice,especially Basmati-and Jasmine-type rice,is being traded at a high price in the local and global markets.Genetically,rice aroma is a phenotypical expression of spontaneous recessive mutations of the OsBadh2 gene(also known as fgr/badh2/osbadh2/os2AP gene).These mutations inhibit the flow ofγ-aminobutyraldehyde(GAB-ald)toγ-aminobutyric acid(GABA),and consequently,the accumulated GAB-ald is diverted to a potent flavour component 2-acetyl-1-pyrroline(2AP)by a non-enzymatic reaction with methylglyoxal.The natural incidence of non-functional osbadh2 mutation along with selection and nursing by the farmer from the ancient time makes rice aroma as a prominent natural gift.As GABA and methylglyoxal play significant roles in stress tolerance,and their biosynthesis is strictly regulated in rice plants,the accumulation of 2AP in aromatic rice depends on the interaction of various genetic and environmental factors,and its production may come at some costs of sacrificing tolerance.This review focused on some potential underlying genes in the 2AP and GABA biosynthesis pathways,and analyzed most aspects of aroma formation in rice,and summarized the molecular mechanism of aroma production together with its genetic and non-genetic influencing factors.The present review also stated approaches to produce high-quality aromatic rice via developing novel cultivars and with good agronomic knowledge-based practice. | Zakaria Hossain PRODHAN SHU Qingyao | 2020 | Rice science2020，27，2： | 8 |
| 14 | The use of grass as an environmentally friendly additive in water-based drilling fluids显示文摘Excellent drilling fluid techniques are one of the significant guaranteed measures to insure safety,quality,efficiency,and speediness of drilling operations.Drilling Quids are generally discarded after the completion of drilling operations and become waste,which can have a large negative impact on the environment.Drilling materials and additives together with drill cuttings,oil.and water constitute waste drilling fluids,which ultimately are dumped onto soil,surface water,groundwater,and air.Environmental pollution is found to be a serious threat while drilling complex wells or high-temperature deep wells as these types of wells involve the use of oil-based drilling fluid systems and high-performance water-based drilling(luid systems.The preservation of the environment on a global level is now important as various organizations have set up initiatives to drive the usage of toxic chemicals as drilling fluid additives.This paper presents an approach where grass is introduced as a sustainable drilling fluid additive with no environmental problems.Simple waterbased drilling fluids were formulated using bentonite,powdered grass,and water to analyze the rheological and filtration characteristics of the new drilling fluid.A particle size distribution test was conducted to determine the particle size of the grass sample by the sieve analysis method.Experiments were conducted on grass samples of 300.90.and 35 μm to study the characteristics and behavior of the newly developed drilling fluid at room temperature.The results show that grass samples with varying particle sizes and concentrations may improve the viscosity,gel strength,and tiltration of the bentonite drilling fluid.These observations recommend the use of grass as a theological modifier,filtration control agent,and pH control agent to substitute toxic materials from drilling fluids. | M.Enamul Hossain Mohammed Wajheeuddin | 2016 | Petroleum Science2016，13，2： | 8 |
| 15 | Effects of Enriched Biochars Containing Magnetic Iron Nanoparticles on Mycorrhizal Colonisation,Plant Growth,Nutrient Uptake and Soil Quality Improvement显示文摘At present, there is little commercial sale of biochar, since farmers find they can not gain a return on their investment in this amendment in the first few years after its application, because of the high cost associated with large application rates. To overcome this constraint, development of artificially aged enriched biochar-mineral complexes(BMCs), having a higher mineral content, surface functionality, exchangeable cations, high concentration of magnetic iron(Fe) nanoparticles, and higher water-extractable organic compounds has been undertaken by a combined team of researchers and a commercial company. Two biochars produced under different pyrolysis conditions were activated with a phosphoric acid treatment. A mixture of clay, chicken litter, and minerals were added to the biochar, and then this composite was torrefied at either 180 or 220?C. In this study a pot experiment was carried out in glasshouse conditions to determine the effects of four different BMCs, with different formulations applied at rates of 100 and 200 kg ha-1, on the mycorrhizal colonisation, wheat growth and nutrient uptake, and soil quality improvement. It was found that the phosphorus(P) and nitrogen uptake in wheat shoots were significantly greater for a low application rate of BMCs(100 kg ha-1). The present formulation of BMC was effective in enhancing growth of wheat at low application rate(100 kg ha-1). The increase in growth appeared due to an increase in P uptake in the plants that could be partly attributed to an increase in mycorrhizal colonisation and partly due to the properties of the BMC. | Stephen JOSEPH Hossain M.ANAWAR Paul STORER Paul BLACKWELL Chee CHIA Yun LIN Paul MUNROE Scott DONNE Josip HORVAT Jianli WANG Zakaria M.SOLAIMAN | 2015 | Pedosphere2015，25，5： | 7 |
| 16 | Curcumin reverses T cell-mediated adaptive immune dysfunctions in tumor-bearing hosts显示文摘Immune dysfunction is well documented during tumor progression and likely contributes to tumor immune evasion.CD81 cytotoxic T lymphocytes(CTLs)are involved in antigen-specific tumor destruction and CD41 T cells are essential for helping this CD81 T cell-dependent tumor eradication.Tumors often target and inhibit T-cell function to escape from immune surveillance.This dysfunction includes loss of effector and memory T cells,bias towards type 2 cytokines and expansion of T regulatory(Treg)cells.Curcumin has previously been shown to have antitumor activity and some research has addressed the immunoprotective potential of this plant-derived polyphenol in tumor-bearing hosts.Here we examined the role of curcumin in the prevention of tumor-induced dysfunction of T cell-based immune responses.We observed severe loss of both effector and memory T-cell populations,downregulation of type 1 and upregulation of type 2 immune responses and decreased proliferation of effector T cells in the presence of tumors.Curcumin,in turn,prevented this loss of T cells,expanded central memory T cell(TCM)/effector memory T cell(TEM)populations,reversed the type 2 immune bias and attenuated the tumor-induced inhibition of T-cell proliferation in tumor-bearing hosts.Further investigation revealed that tumor burden upregulated Treg cell populations and stimulated the production of the immunosuppressive cytokines transforming growth factor(TGF)-b and IL-10 in these cells.Curcumin,however,inhibited the suppressive activity of Treg cells by downregulating the production of TGF-b and IL-10 in these cells.More importantly,curcumin treatment enhanced the ability of effector T cells to kill cancer cells.Overall,our observations suggest that the unique properties of curcumin may be exploited for successful attenuation of tumor-induced suppression of cell-mediated immune responses. | Sankar Bhattacharyya Dewan Md Sakib Hossain Suchismita Mohanty Gouri Sankar Sen Sreya Chattopadhyay Shuvomoy Banerjee Juni Chakraborty Kaushik Das Diptendra Sarkar Tanya Das Gaurisankar Sa | 2010 | Cellular & Molecular Immunology2010，7，4： | 7 |
| 17 | Fabrication of Bi_2O_3/TiO_2nanocomposites and their applications to the degradation of pollutants in air and water under visible-light显示文摘A nanoheterojunction composite photocatalyst Bi2O3/TiO2working under visible-light(λ 420 nm) was prepared by combining two semiconductors Bi2O3 and TiO2 varying the Bi2O3/TiO2molar ratio. Maleic acid was employed as an organic binder to unite Bi2O3 and TiO2 nanoparticles. The SEM, TEM, XRD and diffuse reflectance spectra were utilized to characterize the prepared Bi2O3/TiO2nanoheterojunction. The nanocomposite exhibited unusual high photocatalytic activity in decomposing 2-propanol in gas phase and phenol in aqueous phase and, evolution of CO2 under visible light irradiation while the end members exhibited low photocatalytic activity. The composite was optimized to 5 mol% Bi2O3/TiO2. The remarkable high photocatalytic efficiency originates from the unique relative energy band position of Bi2O3 and TiO2 as well as the absorption of visible light by Bi2O3. | Ashok Kumar Chakraborty Md Emran Hossain Md Masudur Rhaman K M A Sobahan | 2014 | Journal of Environmental Sciences2014，26，2： | 7 |
| 18 | Synergistic Effects of Biochar and NPK Fertilizer on Soybean Yield in an Alkaline Soil显示文摘Biochar effects on legume growth and biological nitrogen fixation have been studied extensively, mostly in acidic soils with laboratory produced biochar. In the present study, a pot experiment in a full factorial experimental design was performed to examine soybean yield and nodulation of three genotypes grown with or without biochar and NPK fertilizers in an alkaline soil. We observed synergistic effects of biochar and NPK fertilizer applications on biomass and seed yields for all three soybean genotypes. Total biomass production and seed yield increased on average by 67% and 54%, respectively, with biochar and by 201% and 182% with NPK fertilizer application compared to the control. When applications of biochar and NPK fertilizer were combined, the increases were 391% and367%, respectively. However, the biomass production in the control was very low(692 kg ha-1) due to a high soil p H(8.80). The nodulation increased with biochar and NPK fertilizer applications, and was largest with the combined application. A correlation was found between leaf chlorophyll content(single photon avalanche diode value) and nodule number. We suggested that the synergistic increase in yield was due to a decrease in soil p H caused by biochar and NPK fertilizer applications thereby increasing P availability in this alkaline soil. | Fatima Z.METE Shamim MIA Feike A.DIJKSTRA Md.ABUYUSUF A.S.M.Iqbal HOSSAIN | 2015 | Pedosphere2015，25，5： | 7 |
| 19 | 预紧力对轴承接触状态及电主轴回转性能的影响显示文摘高速电主轴角接触球轴承的性能由转速、支承刚度、旋转精度和摩擦生热等因素决定,这些因素都直接关系到轴承在轴向预紧力作用下的接触特性。研究了轴承滚动体与滚道在轴向预紧力变化下的接触特性。提出了一种利用开尔文四线法测定轴承不同轴向预紧力下接触电阻的新方法。结果表明,随着轴承轴向预紧力的增大,接触电阻呈非线性减小。对于角接触球轴承,当轴向预紧力大于一定值时,接触电阻趋向平稳,形成'L'型曲线。进一步研究了轴向预紧力对背靠背角接触球轴承对作为大型电主轴一端支撑的旋转精度的影响。研究表明,轴承外圈径向跳动随着轴向预紧载荷的增大呈现'降-升-降'的波动趋势,反映了径向游隙变化以及背对背轴承对隔离挡圈平行度误差对轴承外圈姿态变化的综合影响。本研究为角接触球轴承作为小型电主轴和大型电主轴的支撑进行轴向预紧时预紧载荷的优化提供了技术支撑。 | Md Junayed Hossain 孙翔雨 姚振强 | 2020 | 机械设计与研究2020，36，3： | 7 |
| 20 | Design and analysis of high birefringence and nonlinearity with small confinement loss photonic crystal fiber显示文摘High birefringence with low confinement loss photonic crystal fiber (PCF) has significant advantages in the field of sensing, dispersion compensation devices, nonlinear applications, and polarization filter. In this report, two different models of PCFs are presented and compared. Both the models contain five air holes rings with combination of circular and elliptical air holes arrangement. Moreover, the elliptical shaped air holes polarization and the third ring air holes rotational angle are varied. To examine different guiding characteristics, finite element method (FEM) with perfectly matched layer (PML) absorbing boundary condition is applied from 1.2 to 1.8 |im wavelength range. High birefringence, low confinement loss, high nonlinearity, and moderate disper-sion values are successfully achieved in both the PCFs models. Numeric analysis shows that model-1 gives higher birefringence (2.75 ×10^-2) and negative dispersion (-540.67 ps/(nm ·km)) at 1.55 |im wavelength. However, model-2 gives more small confinement loss than model-1 at the same wavelength. In addition, the proposed design demonstrates the variation of rotation angle has great impact to enhance guiding properties especially the birefringence. | Rekha SAHA Md.Mahbub HOSSAIN Md. Ekhlasur RAHAMAN Himadri Shekhar MONDAL | 2019 | Frontiers of Optoelectronics2019，12，2： | 6 |
您所在的机构暂未开通此部分的功能，请联系管理员