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Assaying the allelopathic effects of Eucalyptus camaldulensis in a nursery bed incorporated with leaf litter

Journal of Forestry Research 2018年第3期29卷 592-598页

作者： romel ahmed Mohammad Shafioul Alam Farid Uddin ahmed M.K.Hossain Department of Forestry and Environmental Science Shahjalal University of Science and TechnologySylhet 3114Bangladesh Ministry of Public Administration TeknafCoxsbazarDhaka 4761Bangladesh Arannayk Foundation House 21 Western RoadDOHSBananiDhaka 1206Bangladesh Institute of Forestry and Environmental Science University of ChittagongChittagong 4331Bangladesh

Allelopathic effects of Eucalyptus camaldulensis Dehnh. were confirmed in Petri dish and pot experiments in our previous studies. However, the degree to which such effects under controlled experiments exist in more complex ecological settings remains to be tested. Thus, the present study was carried out by incorporating different proportions of ground litter of E. camaldulensis in soil. The growth of three agricultural crops: falen(Vigna unguiculata(L.) Walp.), chickpea(Cicer arietinum L.), and arhor(Cajanus cajan(L.) Millsp.), and two tree species, kala koroi(Albizia procera(Roxb.) Benth.) and ipil ipil(Leucaena leucocephala(Lam.) de Wit) were tested. There were inhibitory effects of leaf litter on germination, shoot and root growth, leaf number, and collar diameter as well as a reduction of nodulation by legume crops(25–80%reduction). The extent of the effects was dependent on the proportion of leaf litter, the species and the type of traits. In contrast to shoot growth, the effect on root growth was more severe. No effect on germination was found with the agriculture crops while the two tree species showed reduced germination. The effect was greater in the presence of higher proportions of leaf litter mixed in soil while in some cases lower proportions stimulated growth. Not all species were suppressed; A. procera, C. cajan, V. unguiculata showed compatible growth while C. arietinum and *** were found incompatible. This study provides evidence that E. camaldulensis has allelopathic potential under field conditions and a careful selection of associated crops in agroforestry systems is highly recommended.

关键词： Allelopathy Eucalyptus camaldulensis Inhibitory effects Germination Growth Nodulation

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Inhibitory effects of Albizia lebbeck leaf extracts on germination and growth behavior of some popular agricultural crops

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Journal of Forestry Research 2007年第2期18卷 128-132页

作者： Mohammad Belal Uddin romel ahmed Sharif ahmed Mukul Mohammed Kamal Hossain Department of Forestry School of Agriculture and Mineral Sciences Shahjalal University of Science and Technology Sylhet 3114 Bangladesh Institute of Forestry and Environmental Sciences Chittagong University Chittagong 4331 Bangladesh

An experiment was conducted to observe the inhibitory effects of the leaf extracts derived from Albizia lebbeck （L.） Benth. On germination and growth behavior of some popular agricultural crops （receptor） of Bangladesh. Experiments were set on sterilized petridishes with a photoperiod of 24 h at room temperature of 27-30℃. The effects of the different concentrations of aqueous extracts were compared to distil water （control.）. The aqueous extracts of leaf caused significant inhibitory effect on germination, root and shoot elongation and development of lateral roots of receptor plants. Bioassays indicated that the inhibitory effect was proportional to the concentrations of the extracts and higher concentration （50%-100%） had the stronger inhibitory effect whereas the lower concentration （10%-25%） showed stimulatory effect in some cases. The study also revealed that, inhibitory effect was much pronounced in root and lateral root development rather than germination and shoot growth.

关键词： Albizia lebbeck (L.) Benth. Allelopathic effect Leaf extracts Germination Growth behavior

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Allelopathic effects of Leucaena leucocephala leaf litter on some forest and agricultural crops grown in nursery

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Journal of Forestry Research 2008年第4期19卷 298-302页

作者： romel ahmed A.T.M.Rafiqul Hoque Mohammed Kamal Hossain Department of Forestry School of Agriculture and Mineral SciencesShahjalal University of Science and Technology Institute of Forestry and Environmental Sciences University of Chittagong Laboratory of Ecology and Systematics Biology DivisionFaculty of ScienceUniversity of the Ryukyus

An experiment was conducted to assess the effect of leaf litter of Leucaena leucocephala on two forest crops Sada koroi （Albizia procera）, Ipil ipil （L. leucocephala） and three agricultural crops Falen （Vigna unguiculata）, Chickpea （Citer arietinum） and Arhor （Cajanus cajan） in the nursery of the Institute of Forestry and Environmental Sciences, Chittagong University, Bangladesh, in a Randomized Block Design. Results suggested that leaf litters ofL. leucocephala induced inhibitory effects on germination and growth of bioassay. It was also found that the effect depended on concentration of extract and litterfall, type of receptor species. Higher concentration of the materials had the higher effect and vice versa. Growth response of receptor crops varied with the variation of leaf litter application. The study revealed that application of low-dose leaf litter specially litter of 10 g·m^-2 had stimulating effect on shoot growth of C. arietinum, Vunguiculata and A. procera. While in all other cases significant inhibitory effect was observed and it was significantly increased with the increase of leaf litter application. However, the trend of inhibition was uneven with treatments. Root growth was found to be more affected than shoot growth.

关键词： allelopathy agroforestry choice of species inhibitory effect leaf litters mixed cropping mixed plantation.

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Allelopathic effects of leaf litters of Eucalyptus camaldulensis on some forest and agricultural crops

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Journal of Forestry Research 2008年第1期19卷 19-24页

作者： romel ahmed A. T. M. Rafiqul Hoque Mohammed Kamal Hossain Department of Forestry School of Agriculture and Marine SciencesShahjalal University of Science and Technology Institute of Forestry and Environmental Sciences University of Chittagong

Allelopathic effects of different doses of Eucalyptus camaldulensis leaf litters were investigated through an experiment in the green house of Institute of Forestry and Environmental Sciences, Chittagong, Bangladesh. Three popular agricultural crops： Falen （Vigna unguiculata）, Chickpea （Cicer arietinum）, Arhor （Cajanus cajan） and two widely used plantation trees： Sada koroi （Albizia procera） and Ipil ipil （Leucaena leucocephala） were selected as bioassay species. Experiment was set on tray at room temperature 27℃. The effects of different doses of leaf litter extracts were compared to the control. Results suggest that leaf litters of E, camaldulesis induced inhibitory effects, It was also found that the effect depend on concentration of extract and litterfall, type of receiver species. Higher concentration of the materials had the higher effect and vice versa. Though all the bioassay species were suppressed some of them showed better performance. Vigna unguiculata, Cicer arietinum are recommended in agroforestry based on this present Experiment output. In mixed plantation, Leucaena leucochephala is a better choice while compared to Albizia procera.

关键词： agroforestry choice of species inhibitory effect leaf litters mixed cropping mixed plantation

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Allelopathic effects of Lantana camara on germination and growth behavior of some agricultural crops in Bangladesh

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Journal of Forestry Research 2007年第4期18卷 301-304页

作者： romel ahmed Mohammad Belal Uddin Mohammed AbuSayed Arfin Khan Sharif ahmed Mukul Mohammed Kamal Hossain Department of Forestry and Environmental Science School of Agriculture and MineralSciences Shahjalal University of Science and Technology (SUST) Sylhet 3114 Bangladesh Institute of Forestry and Environmental Sciences (IFES) Chittagong University Chittagong 4331 Bangladesh

An experiment was conducted to understand the growth inhibitory effects of aqueous extracts derived from Lantana camara L. （a globally recognized invasive alien weed） on six popular agricultural crops of Bangladesh. The test was conducted in sterilized petridishes with a photoperiod of 24 hours and an average temperature of 29℃. The effect of different concentrations ofL. camara leaf extracts were recorded and compared with control （i.e., distil water）. Result showed different concentrations of aqueous leaf extracts caused significant inhibitory effect on germination, root and shoot elongation and development of lateral roots of receptor crops. Bioassays also indicated that the inhibitory effect was proportional to the concentrations of the extracts and higher concentration had the stronger inhibitory effect whereas the lower concentration showed stimulatory effect in some cases. The inhibitory effect was much pronounced in root and lateral root development rather than shoot and germination.

关键词： Lantana camara L. Allelopathy Agricultural crops Germination and growth

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Bamboo based small-scale cottage industries in the rural areas of Chittagong region,Bangladesh

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世界竹藤通讯 2003年第2期1卷 6-11页

作者： Md.Danesh Miahl Mohammad Belal Uddin romel ahmed Institute of Forestry and Environmental Sciences Chittagong University(IFESCU)Chittagong 4331BangladeshInstitute of Forestry and Environmental SciencesChittagong University(IFESCU)Chittagong 4331BangladeshInstitute of Forestry and Environmental SciencesChittagong University(IFESCU)Chittagong 4331Bangladesh

对孟加拉吉大港地区家庭竹子手工业非农就业的潜力以及对其产生的社会经济效益进行了调查。本地区有40个竹企业,涉及到Hathazcori upazila的4个村庄。80％手工业者的年龄在30～50岁。他们的大多数是未受教育和土地贫瘠的家庭成员。50％... 详细信息

对孟加拉吉大港地区家庭竹子手工业非农就业的潜力以及对其产生的社会经济效益进行了调查。本地区有40个竹企业,涉及到Hathazcori upazila的4个村庄。80％手工业者的年龄在30～50岁。他们的大多数是未受教育和土地贫瘠的家庭成员。50％的企业是由夫妻或3～5个工人组成的。竹产品主要是满足当地市场的需求。产品是根据季节的变化而决定的。5个产品中,竹书架提供了企业月净收入的41％,平均月净利润约2373.48塔卡,这为促进乡村经济发展起到重要的作用。作者对竹产业发展的状况进行了验证,并提出了建议。

关键词：孟加拉吉大港地区家庭种植竹子手工业非农就业问题竹产品市场需求

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Nanosecond pulse and dual-wavelength Q-switched 1.5 μm fiber laser using MAX phase Cr2TiAlC2 saturable absorber

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Optoelectronics Letters 2025年第1期21卷 7-12页

作者： ahmed Shakir AL-HITI Hiba HASSAN Department of Electrical Engineering Faculty of Engineering University of Anbar Department of Laser and Optoelectronics Engineering University of Technology-Iraq

We demonstrated a new type of MAX phase material, chromium titanium aluminum carbide（Cr2TiAlC2） polymer film, to generate a passively Q-switched erbium-doped fiber laser（EDFL）. The film thickness was measured to be around 45 μm, which was fabricated using the embedding method with polyvinyl alcohol（PVA） polymer as hoster. The saturable absorber（SA） film demonstrates a dual-wavelength passively Q-switched EDFL which operates at 1 531 nm and 1 560.19 nm, respectively. The Q-switching pulse duration could be varied from 2.46 μs to 770 ns, while the repetition rate varied from 92.76 kHz to 106.6 kHz with an increasing input pumping range from 154 mW to 300 mW. The maximum output power and pulse energy of 15.05 mW and 141.18 nJ were obtained at the maximum input power of 300 mW, respectively.

关键词： Saturable absorbers

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Vascular endothelial growth factor:a double-edged sword in the development of white matter lesions

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Neural Regeneration Research 2025年第1期20卷 191-192页

作者： Narek Manukjan Daniel Fulton Zubair ahmed WMatthijs Blankesteijn Sébastien Foulquier Department of Pharmacology and Toxicology Maastricht UniversityMaastrichtThe Netherlands CARIM-School for Cardiovascular Diseases Maastricht UniversityMaastrichtThe Netherlands Neuroscience and Ophthalmology Institute of Inflammation and AgeingUniversity of BirminghamEdgbastonBirminghamUK Centre for Trauma Sciences Research University of BirminghamEdgbastonBirminghamUK MHeNs-School for Mental Health and Neuroscience Maastricht UniversityMaastrichtThe Netherlands Department of Neurology Maastricht University Medical CenterMaastrichtThe Netherlands

As the population ages,the burden of age-related diseases becomes ***,over 55 million people suffer from dementia worldwide,with Alzheimer’s disease being the most common ***,it is becoming clearer that underlying vascular pathology such as cerebral small vessel disease(cSVD)may be a more detrimental cause for dementia(Cuadrado-Godia et al.,2018).It is estimated that 10%-30%of the elderly population and 35%-90%of all dementia patients exhibit signs of *** term cSVD refers to pathology affecting the small vessels of the brain,which can lead to lacunar cerebral infarcts,enlarged perivascular spaces,and cortical hemorrhages(Cuadrado-Godia et al.,2018).CSVD is often associated with cognitive decline,gait problems,and dementia(Cuadrado-Godia et al.,2018).

关键词： pathology becoming white

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Classification of Cybersecurity Threats, Vulnerabilities and Countermeasures in Database Systems

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Computers, Materials & Continua 2024年第11期81卷 3189-3220页

作者： Mohammed Amin Almaiah Leen Mohammad Saqr Leen Ahmad Al-Rawwash Layan ahmed Altellawi romel Al-Ali Omar Almomani King Abdullah the II IT School University of JordanAmman11942Jordan The National Research Center for Giftedness and Creativity King Faisal UniversityAl-Ahsa31982Saudi Arabia Department of Networks and Cybersecurity Al-Ahliyya Amman UniversityAmman19328Jordan

Database systems have consistently been prime targets for cyber-attacks and threats due to the critical nature of the data they *** the increasing reliance on database management systems,this field continues to face numerous *** management systems serve as the foundation of any information system or *** cyber-attack can result in significant damage to the database system and loss of sensitive ***,cyber risk classifications and assessments play a crucial role in risk management and establish an essential framework for identifying and responding to cyber *** assessment aids in understanding the impact of cyber threats and developing appropriate security controls to mitigate *** primary objective of this study is to conduct a comprehensive analysis of cyber risks in database management systems,including classifying threats,vulnerabilities,impacts,and *** classification helps to identify suitable security controls to mitigate cyber risks for each type of ***,this research aims to explore technical countermeasures to protect database systems from cyber *** study employs the content analysis method to collect,analyze,and classify data in terms of types of threats,vulnerabilities,and *** results indicate that SQL injection attacks and Denial of Service(DoS)attacks were the most prevalent technical threats in database systems,each accounting for 9%of *** audit trails,intrusion attempts,and ransomware attacks were classified as the second level of technical threats in database systems,comprising 7%and 5%of incidents,***,the findings reveal that insider threats were the most common non-technical threats in database systems,accounting for 5%of ***,the results indicate that weak authentication,unpatched databases,weak audit trails,and multiple usage of an account were the most common technical vulner

关键词： Cyber threats database systems cyber risk assessment vulnerabilities countermeasures

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Dynamic Interaction Analysis of Coupled Axial-Torsional-Lateral Mechanical Vibrations in Rotary Drilling Systems

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Structural Durability & Health Monitoring 2025年第1期19卷 77-103页

作者： Sabrina Meddah Sid ahmed Tadjer Abdelhakim Idir Kong Fah Tee Mohamed Zinelabidine Doghmane Madjid Kidouche Applied Automation Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Department Mohamed Boudiaf University of M’silaM’sila28000Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building Materials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

Maintaining the integrity and longevity of structures is essential in many industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale systems in petroleum drilling,a strong emphasis on structural durability and monitoring is *** study focuses on the mechanical vibrations that occur in rotary drilling systems,which have a substantial impact on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which might lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm to the system’s components since they are difﬁcult to be detected and controlled in real *** study investigates the dynamic interactions of these vibrations,speciﬁcally in their high-frequency modes,usingﬁeld data obtained from measurement while ***ﬁndings have demonstrated the effect of strong coupling between the high-frequency modes of these vibrations on drilling sys-tem *** obtained results highlight the importance of considering the interconnected impacts of these vibrations when designing and implementing robust control ***,integrating these compo-nents can increase the durability of drill bits and drill strings,as well as improve the ability to monitor and detect ***,by exploiting theseﬁndings,the assessment of structural resilience in rotary drilling systems can be ***,the study demonstrates the capacity of structural health monitoring to improve the quality,dependability,and efﬁciency of rotary drilling systems in the petroleum industry.

关键词： Rotary drilling systems mechanical vibrations structural durability dynamic interaction analysis ﬁeld data analysis

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