检索结果-南通市图书馆

Insect Science 2005年第5期12卷 375-379页

作者： OMkAR AHMAD pervez SATYENDRA k. SINGH Ladybird Research Laboratory Department of Zoology University of Lucknow Lucknow India

The developmental parameters, namely developmental periods, larval survival, adult emergence, growth index, developmental rate and sex ratio in terms of female proportion in a population of two aphidophagous ladybirds, namely, Coelophora biplagiata （Swartz） and Micraspis discolor （Fabricius） were investigated, using three aphid species as prey. The immature stages of C. biplagiata were significantly affected by prey quality and developed fastest when fed on Aphis craccivora followed by Aphis gossypii and Rhopalosiphum maidis. The order of prey suitability in terms of developmental rate of immature stages of M. discolor was just reversed. The adult females were heavier than males, while pre-pupae were heavier than pupae in both ladybirds. The sex ratio of adult emergence, though female-biased in both ladybird species, was not significantly affected by prey quality.

关键词： aphids Coccinellidae Coelophora biplagiata development immature survival Micraspis discolor

A Brief Study on the Ignition of the Non-Thermal Atmospheric Pressure Plasma Jet from a Double Dielectric Barrier Configured Plasma Pencil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第7期15卷 627-634页

作者： Asma BEGUM Mounir LAROUSSI M. R. pervez School of Engineering and Computer Science Independent UniversityDhaka Bangladesh Department of Electrical and Computer Engineering Old Dominion UniversityUSA Department of Physics Master Mind CollegeDhaka Bangladesh

To understand the self sustained propagation of the plasma jet/bullet in air under atmospheric pressure, the ignition of the plasma jet/bullet, the plasma jet/bullet ignition point in the plasma pencil, the formation time and the formation criteria from a dielectric barrier configured plasma pencil were investigated in this study. The results were confirmed by comparing these results with the plasma jet ignition process in the plasma pencil without a dielectric barrier. Electrical, optical, and imaging techniques were used to study the formation of the plasma jet from the ignition of discharge in a double dielectric barrier configured plasma pencil. The investigation results show that the plasma jet forms at the outlet of the plasma pencil as a donut shaped discharge front because of the electric field line along the outlet＇s surface. It is shown that the required time for the formation of the plasma jet changes with the input voltage of the discharge. The input power calculation for the gap discharge and for the whole system shows that 56% of the average input power is used by the first gap discharge. The estimated electron density inside the gap discharge is in the order of 1011 cm^-3. If helium is used as a feeding gas, a minimum 1.48× 10^-8 C charge is required per pulse in the gap discharge to generate a plasma jet.

关键词： plasma jet/bullet bullet formation dielectric barrier discharge non-thermalatmospheric pressure plasma

A Complete Foliation of Schwarzschild Spacetime by Free Falling Hypersurfaces

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第12期23卷 3161-3164页

作者： M. Ayub Faridi Amjad pervez Haris Rashid Fazal-e-Aleem Centre for High Energy Physics (CHEP) University of the Punjab Lahore 54590 Pakistan Institute of Chemical Engineering and Technology University of the Punjab Lahore 54590 Pakistan

Free falling hypersurfaces in the Schwarzschild geometry have been studied to provide a complete foliation of spacetime. The hypersurfaces do not cross into the maximally extended spacetime and are well behaved everyw... 详细信息

关键词： CONSTANT-MEAN-CURVATURE RELATIVITY SURFACES TIME

SOME COMMENTS ON THE ORIGINAL kALUZA-kLEIN THEORY

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 1987年第9期8卷 825-827页

作者： Amjad pervez Asghar Qadir Department of Mathematics Quaid-I-Azam University Pakistan

In this note the basis of the kaluza-klein theory is examined critically and it is pointedout that the five-dimensional version can’t work in the way that was originally *** why the problem was not noted originally i... 详细信息

关键词： SOME COMMENTS ON THE ORIGINAL kALUZA-kLEIN THEORY

An Autonomous Wall-Climbing Robot for Inspection of Reinforced Concrete Structures: SIRCAUR

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Artificial Intelligence and Technology 2021年第3期1卷 188-196页

作者： Gabriela Gallegos Garrido Tariq pervez Sattar London South Bank University London South Bank Innovation CentreGranta ParkGreat AbingtonCambridge CB216ALUK

A wall-climbing inspection robot has been designed to climb on safety-critical concrete structures by adhering to reinforcement steel bars(rebars)using permanent magnets to generate the adhesion *** and experimental validation have been performed to determine the optimum flux focusing magnet configurations with the robot operating on 30–35 mm of concrete cover over rebars arranged in different *** goal of adhesion force optimization is to be able to carry a ground-penetrating radar(GPR)sensor which detects rebar corrosion,concrete delamination,and concrete cover *** autonomous robot uses an ultra-wide band localization system and GPR data to control its motion trajectories to avoid regions where there is an insufficient density of *** testing(NDT)inspection data acquired by GPR are transmitted wirelessly to a ground station for processing and monitoring by NDT technicians.

关键词： climbing robot GPR NDT FEA magnetic adhesion reinforced concrete UWB

Staged endovascular reconstruction of complex traumatic intracranial carotid artery dissection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2020年第3期5卷 308-310页

作者： karan k Topiwala Mohammed Hussain Janhavi Modak Inam kureshi Amre Nouh Mubashir pervez Brendan killory Daniel Lee Neurology University of Connecticut School of MedicineFarmingtonConnecticutUSA Interventional Neuroradiology Hartford HospitalHartfordConnecticutUSA Neurosurgery Hartford HospitalHartfordConnecticutUSA Neurology Hartford HospitalHartfordConnecticutUSA

Case presenTaTion A 32-year old woman presented with traumatic facial injuries from a horseback riding *** was found to have a Glasgow Coma Score of 3T,left eyelid ptosis with a fixed-dilated pupil and a flaccid right upper *** angiogram of the head showed complex craniofacial injuries,including a transverse fracture transecting the clivus and the left petrous temporal bone,with SAH in the suprasellar *** was a bilateral engorgement of the superior ophthalmic veins,suggestive of bilateral CCF *** subtraction angiography(DSA)showed a left petrocavernous internal carotid artery dissection(ICAD).MRI of the brain demonstrated multiple embolic infarcts in the left middle cerebral artery(MCA)territory,despite therapeutic anticoagulation with heparin.

关键词： injuries dissection traumatic

Bio-Inspired Modelling of Disease Through Delayed Strategies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第12期73卷 5717-5734页

作者： Arooj Nasir Dumitru Baleanu Ali Raza pervez Anwar Nauman Ahmed Muhammad Rafiq Tahir Nawaz Cheema Baqai Medical University Karachi75340Pakistan Shalamar Medical and Dental College Lahore54000Pakistan Department of Mathematics Cankaya UniversityBalgatAnkara06530Turkey Department of Medical Research China Medical UniversityTaichung40402Taiwan Institute of Space Sciences Magurele-Bucharest077125Romania Department of Mathematics Govt.Maulana Zafar Ali Khan Graduate College WazirabadPunjab Higher Education Department(PHED)Lahore54000Pakistan Department of Biochemistry University of SialkotSialkot51310Pakistan Department of Mathematics and Statistics The University of LahoreLahore54590Pakistan Department of Mathematics Faculty of SciencesUniversity of Central PunjabLahore54000Pakistan Department of Mathematics University of GujratGujrat52000Pakistan

In 2020,the reported cases were 0.12 million in the six regions to the official report of the World Health Organization(WHO).For most children infected with leprosy,0.008629 million cases were detected under *** total infected ratio of the children population is approximately 4.4 *** to theCOVID-19 pandemic,the awareness programs implementation has been *** disease still has a threat and puts people in *** delayed modeling is critical in various allied sciences,including computational biology,computational chemistry,computational physics,and computational economics,to name a *** time delay effect in treating leprosy delayed epidemic model is *** whole population is divided into four groups:those who are susceptible,those who have been exposed,those who have been infected,and those who have been *** local and global stability of well-known conclusions like the Routh Hurwitz criterion and the Lyapunov function has been *** parameters’sensitivity is also *** analytical analysis is supported by computer results that are presented in a variety of *** proposed approach in this paper preserves equilibrium points and their stabilities,the existence and uniqueness of solutions,and the computational ease of implementation.

关键词： Leprosy disease delayed model stability analysis computer results

Stochastic Analysis for the Dynamics of a Poliovirus Epidemic Model

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 Modeling in Engineering & Sciences 2023年第7期136卷 257-275页

作者： Ali Raza Dumitru Baleanu Zafar Ullah khan Muhammad Mohsin Nauman Ahmed Muhammad Rafiq pervez Anwar Department of Mathematics Government Maulana Zafar Ali Khan Graduate College WazirabadPunjab Higher Education Department(PHED)Lahore54000Pakistan Department of Mathematics Cankaya UniversityBalgatAnkara06530Turkey Department of Medical Research China Medical UniversityTaichung40402Taiwan Institute of Space Sciences Magurele-Bucharest077125Romania Department of Dermatology Rashid Latif Medical College LahoreLahore54000Pakistan Department of Mathematics Technische Universitat ChemnitzChemnitz6209111Germany Department of Mathematics and Statistics The University of LahoreLahore54590Pakistan Department of Mathematics Faculty of Science and TechnologyUniversity of Central PunjabLahore54000Pakistan Department of Biochemistry University of SialkotSialkot51311Pakistan

Most developing countries such as Afghanistan,Pakistan,India,Bangladesh,and many more are still fighting against *** to the World Health Organization,approximately eighteen million people have been infected with poliovirus in the last two *** Asia,still,some countries are suffering from the *** stochastic behavior of the poliovirus through the transition probabilities and non-parametric perturbation with fundamental properties are *** basic properties of the deterministic model are studied,equilibria,local stability around the stead states,and reproduction *** Maruyama,stochastic Euler,and stochastic Runge-kutta study the behavior of complex stochastic differential *** main target of this study is to develop a nonstandard computational method that restores dynamical features like positivity,boundedness,and dynamical ***,the existing methods failed to fix the actual behavior of the *** comparison of the proposed approach with existing methods is investigated.

关键词： Poliovirus model differential equations methods analysis

Spectrophotometric Determination of kelthane in Environmental Samples

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2011年第6期2卷 726-730页

作者： Etesh k. Janghel Y. pervez 不详

Sensitive spectrophotometric method for determination of kelthane in sub parts per million level is described, which is based on Fujiwara reaction. kelthane on alkaline hydrolysis gives chloroform, which can be reacted with pyridine to produce red colour. The colour is discharged by addition of glacial acetic acid. Then Benzidine (4,4’-Bianiline) reagent is added due to which a yellowish-red colour is formed which has an absorption maximum at 490nm. Beer’s law is obeyed in the range of 3.3 - 26.0 μg (0.13 - 1.04 ppm) of kelthane per 25ml of final solution. The molar absorptivity and Sandell’s sensitivity were found to be 4.32 × 105 L?mol–1?cm–1 and 0.022 μg?cm–2 respectively. The method is found to be free from interferences of other organochlorine pesticides and various co-pollutants and can be successfully applied for the determination of kelthane in environmental samples.

关键词： Spectrophotometry kelthane Acaricide Benzidine Environmental Samples