检索结果-南通市图书馆

Journal of Central South University 2012年第5期19卷 1346-1352页

作者： A.Paykani R.Khoshbakhti Saray M.T.Shervani-Tabar a.mohammadi-kousha Department of Automotive Engineering Iran University of Science and TechnologyNarmakTehran ***Iran Department of Mechanical Engineering Sahand University of TechnologySahand New CityTabrizIran Department of Mechanical Engineering University of TabrizTabrizIran

Achieving simultaneous reduction of NOx,CO and unburned hydrocarbon(UHC) emissions without compromising engine performance at part loads is the current focus of dual fuel engine *** present work focuses on an experimental investigation conducted on a dual fuel(diesel-natural gas) engine to examine the simultaneous effect of inlet air pre-heating and exhaust gas recirculation(EGR) ratio on performance and emission characteristics at part *** use of EGR at high levels seems to be unable to improve the engine performance at part ***,it is shown that EGR combined with pre-heating of inlet air can slightly increase thermal efficiency,resulting in reduced levels of both unburned hydrocarbon and NOx *** and UHC emissions are reduced by 24% and 31%,respectively,The NOx emissions decrease by 21% because of the lower combustion temperature due to the much inert gas brought by EGR and decreased oxygen concentration in the cylinder.

关键词： dual fuel engine exhaust gas recirculation (EGR) emission performance venturi EGR system

Improving the Surface Roughness of Dental Implant Fixture by Considering the Size,Angle and Spraying Pressure of Sandblast Particles

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第1期21卷 303-324页

作者： Ehsan Anbarzadeh Bijan mohammadi School of Mechanical Engineering Iran University of Science and TechnologyTehranIran

In this study,different conditions of sandblasting on dental implant fixtures were investigated to achieve the best sandblasting conditions.18 different sandblasting conditions(Using 152 implant fixture samples)were examined,including parameters such as particle size,particle blasting pressure,and particle blasting *** surface treatment of the samples was performed using the SLA+Anodizing *** testing was performed for each of the 18 different states,and the average surface roughness of each of these was compared with each ***,a bone layer was placed on the sample with the closest average surface roughness to the standard and the least amount of aluminum oxide on its surface among the 18 different states,to confirm the accuracy and quality of the desired surface roughness by examining the bone formation process and *** results showed that state No.4(sandblast particle size:75µm,spraying pressure of sandblast particles:4 bar,sandblast particle spraying angle:30 degrees),which was prepared using the SLA+Anodizing method and had a surface roughness of 1.989µm(The percentage of Al_(2)O_(3)on the surface=6%),had the best sandblasting conditions and showed 95%cell viability and accelerated the treatment and bone formation process for about a *** simulation results,using Abaqus software,indicated that the stress distribution on the surface of the implant fixture in contact with the bone surface has increased by approximately 4.3%for state *** will help prevent loosening of the dental implant fixture over time.

关键词： Dental implants Surface treatment Sandblast Surface roughness Osseointegration

Approximate solution of Volterra-Fredholm integral equations using generalized barycentric rational interpolant

维普期刊数据库评论

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(A Journal of Chinese Universities) 2024年第2期39卷 220-238页

作者： Hadis Azin Fakhrodin mohammadi Department of Mathematics University of HormozganBandar AbbasP.O.Box 3995Iran

It is well-known that interpolation by rational functions results in a more accurate approximation than the polynomials ***,classical rational interpolation has some deficiencies such as uncontrollable poles and low convergence *** contrast with the classical rational interpolants,the generalized barycentric rational interpolants which depend linearly on the interpolated values,yield infinite smooth approximation with no poles in real *** this paper,a numerical collocation approach,based on the generalized barycentric rational interpolation and Gaussian quadrature formula,was introduced to approximate the solution of Volterra-Fredholm integral *** types of points in the solution domain are used as interpolation *** obtained numerical results confirm that the barycentric rational interpolants are efficient tools for solving Volterra-Fredholm integral ***,integral equations with Runge’s function as an exact solution,no oscillation occurrs in the obtained approximate solutions so that the Runge’s phenomenon is avoided.

关键词： Barycentric rational interpolation Volterra-Fredholm integral equations Gaussian quadrature Runge's phenomenon

Annual growth of Fagus orientalis is limited by spring drought conditions in Iran’s Golestan Province

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第1期35卷 128-142页

作者： Khalil Ghorbani Jahangir mohammadi Laleh Rezaei Ghaleh Department of Water Engineering Faculty of Water and Soil EngineeringGorgan University of Agricultural Sciences and Natural ResourcesGorganIran Department of Forestry Gorgan University of Agricultural Sciences and Natural ResourcesGorganIran Department of Water Engineering Faculty of AgricultureUrmia UniversityUrmiaIran

Due to the lack of a uniform and accurate defi-nition of‘drought’,several indicators have been introduced based on different variables and methods,and the efficiency of each of these is determined according to their relationship with *** relationship between two drought indices,SPI(standardized precipitation index)and SPEI(standard-ized precipitation-evapotranspiration index)in different sea-sons was investigated using annual rings of 15 tree samples to determine the effect of drought on the growth of oriental beech(Fagus orientalis Lipsky)in the Hyrcanian forests of northern *** different evapotranspiration calcula-tion methods were evaluated on SPEI efficiency based on Hargreaves-Samani,Thornthwaite,and Penman-Monteith methods using the step-by-step M5 decision tree regression *** results show that SPEI based on the Penman-Monteith in a three-month time scale(spring)had similar temporal changes and a better relationship with annual tree rings(R^(2)=0.81)at a 0.05 significant *** change and a decreasing trend in the time series of annual tree rings are similar to the variation in the SPEI based on the Penman-Monteith *** affecting evapotranspiration,temperature,wind speed,and sunshine hours(used in the Penman-Monteith method),increased but precipitation *** non-linear modeling methods,SPEI based on Penman-Monteith best illustrated climate changes affecting tree growth.

关键词： Climate change Drought index Hyrcanian forests SPEI'Annual growth rings Fagus orientalis

Macrophage modulation with dipeptidyl peptidase-4 inhibitors:A new frontier for treating diabetic cardiomyopathy?

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第9期15卷 1847-1852页

作者： Saeed mohammadi Ahmed Al-Harrasi Natural and Medical Sciences Research Center University of NizwaNizwa 616Oman Department of Biological Sciences and Chemistry University of NizwaNizwa 616Oman

This editorial introduces the potential of targeting macrophage function for diabetic cardiomyopathy(DCM)treatment by dipeptidyl peptidase-4(DPP-4)*** et al studied teneligliptin,a DPP-4 inhibitor used for diabetes management,and its potential cardioprotective effects in a diabetic mouse *** suggested teneligliptin administration may reverse established markers of DCM,including cardiac hypertrophy and compromised *** also inhibited the NLRP3 inflammasome and reduced inflammatory cytokine production in diabetic *** play crucial roles in DCM *** hyperglycemia disturbs the balance between pro-inflammatory(M1)and antiinflammatory(M2)macrophages,favoring a pro-inflammatory state contributing to heart ***,we highlight the potential of DPP-4 inhibitors to modulate macrophage function and promote an anti-inflammatory *** compounds may achieve this by elevating glucagon-like peptide-1 levels and potentially inhibiting the NLRP3 *** studies on teneligliptin in combination with other therapies targeting different aspects of DCM could be suggested for developing more effective treatment strategies to improve cardiovascular health in diabetic patients.

关键词： Diabetic cardiomyopathy Macrophage Dipeptidyl peptidase-4 inhibitor Teneligliptin NLRP3 inflammasome Glucagon-like peptide-1

A typology of clustered housing for older adults towards opportunities for social interaction:A case study of Dutch social housing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2024年第3期13卷 561-574页

作者： Kim Hamers Nienke Moor Masi mohammadi Research Group Architecture in Health HAN University of Applied SciencesArnhemthe Netherlands Chair Smart Architectural Technologies Eindhoven University of TechnologyEindhoventhe Netherlands

Dutch housing associations are dealing with a growing number of tenants who are ageing in ***,there is a lack of suitable housing that meets the(social)needs of this target *** housing,which offers a socio-spatial context that facilitates encounters between residents,is considered a promising housing concept to(partly)fill this ***,clustered housing is a broad concept consisting of a variety of housing types that differ from each other in the extent to which people“live together”.Still little is known about which types of clustered housing can be distinguished in relation to the potential for social ***,in this article we distinguish between types of clustered housing based on social,organizational,and spatial building *** have mapped these characteristics by combining real estate data of housing association Woonzorg Nederland with survey data collected among their building *** on this dataset,an explorative cluster analysis was performed,resulting in four types of clustered ***,further exploration of the data shows that,from the perspective of building managers,residents of certain types of clustered housing interact more often and feel more connected with each other than residents of non-clustered housing types.

关键词： Clustered housing Typology Seniors Social housing

Design of a Novel Electrochemical Aptasensor Based on Molybdenum Disulfide Nanosheets for Lysozyme Detection

在线全文

学校读者我要写书评

暂无评论

Journal of Analysis and Testing 2024年第1期8卷 16-27页

作者： Tavoos Beiki Ghasem Najafpour-Darzi Maedeh mohammadi Mohsen Shakeri Biotechnology Research Laboratory Department of Chemical EngineeringBabol Noshirvani University of TechnologyBabol 47148-71167Iran Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabol 47148-71167Iran

The precise detection of lysozyme plays a crucial role in early diagnosis of kidney failure in leukemia ***,we designed an electrochemical aptasensor to detect lysozyme using a glassy carbon electrode(GCE)modified with molybdenum disulfide(MoS_(2))nanosheets decorated with chitosan(Ch)and gold nanoparticles(Au).In the next steps of aptasensor preparation,aptamer(Apt)strands were immobilized on MoS_(2)-Au-Ch/GCE surface via electrostatic interactions,and bovine serum albumin(BSA)solution was applied to cover unbonded areas on Apt/MoS_(2)-Au-Ch/*** MoS_(2)-Au-Ch nanocomposite can warrant enhanced immobilization of aptamers and strong signals because of wrinkle-like structure and base planes in MoS nanosheets,presence of abundant amino and carboxyl functional groups in chitosan and Au *** pulse voltammetry(DPV)was used to evaluate the electrochemical behavior of the aptasensor at each preparation step and its detection *** developed electrochemical aptasensor based on MoS nanosheets showed remarkable performance for lysozyme detection in the range from 1 pmol/L to 10 nmol/L with a limit of detection of 2.2 fmol/*** proposed aptasensor provided excellent selectivity against BSA,uric acid,cytochrome C,lysozyme and their *** addition,it displayed great stability of about 99.58%of the initial signal upon 21-day *** on human serum and urine samples yielded promising recoveries ranging from 98 to 105%.Hence,MoS_(2)-Au-Ch nanocomposite-based aptasensor could be an outstanding candidate for medical device applications and protein quantification.

关键词： Electrochemical aptasensor Lysozyme MoS_(2)nanosheets Apt/MoS_(2)-Au-Ch/GCE

A Review of Image Steganography Based on Multiple Hashing Algorithm

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第8期80卷 2463-2494页

作者： Abdullah Alenizi Mohammad Sajid mohammadi Ahmad A.Al-Hajji Arshiya Sajid Ansari Department of Information Technology College of Computer and Information SciencesMajmaah UniversityAl-Majmaah11952Saudi Arabia Department of Computer Science College of Engineering and Information TechnologyOnaizah CollegesQassim56312Saudi Arabia

Steganography is a technique for hiding secret messages while sending and receiving communications through a cover *** ancient times to the present,the security of secret or vital information has always been a significant *** development of secure communication methods that keep recipient-only data transmissions secret has always been an area of ***,several approaches,including steganography,have been developed by researchers over time to enable safe data *** this review,we have discussed image steganography based on Discrete Cosine Transform(DCT)algorithm,*** have also discussed image steganography based on multiple hashing algorithms like the Rivest–Shamir–Adleman(RSA)method,the Blowfish technique,and the hash-least significant bit(LSB)*** this review,a novel method of hiding information in images has been developed with minimal variance in image bits,making our method secure and effective.A cryptography mechanism was also used in this *** encoding the data and embedding it into a carry image,this review verifies that it has been ***,embedded text in photos conveys crucial signals about the *** review employs hash table encryption on the message before hiding it within the picture to provide a more secure method of data *** the message is ever intercepted by a third party,there are several ways to stop this operation.A second level of security process implementation involves encrypting and decrypting steganography images using different hashing algorithms.

关键词： Image steganography multiple hashing algorithms Hash-LSB approach RSA algorithm discrete cosine transform(DCT)algorithm blowfish algorithm

Exploring the meaning of care among lived experiences of patients with blindness:an interpretive phenomenological study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Nursing 2024年第3期11卷 319-326页

作者： Mohammad Ali mohammadi Mehdi Heidarzadeh Saeed Mehri Mahmood Shamshiri Department of Medical-Surgical Nursing School of Nursing and MidwiferyArdabil University of Medical SciencesArdabil ***Iran Department of Emergency Nursing School of Nursing and MidwiferyArdabil University of Medical SciencesArdabil ***Iran Department of Critical Care Nursing School of Nursing and MidwiferyArdabil University of Medical SciencesArdabil ***Iran

Objective:To explore the meaning of care experienced by people with blindness in ***:Interpretive phenomenology along with the 6-step method of van Manen was used to conduct the *** purposeful sampling,15 people with legal blindness were *** analysis was used to isolate the meaning of ***:Five themes emerged:(a)nurses in the eyes of patients with blindness;(b)negligence in the caring moments;(c)being cared for in ambiguity;(d)Uncoordinated care;and(e)Psychological discomfor *** sub-themes were condensed into an overarching theme titled as“marginalized patients inside the stereotypical healthcare system.”Conclusions:Lived experiences of patients with blindness revealed that hospitals provide stereotypic or inappropriate care for this minority group in *** professionals par ticularly nurses should be skilled to provide person-centered and coordinated care for patients with blindness.

关键词： hospitalization lived experience meaning of care people with blindness phenomenology

原油沥青质含量对纳米颗粒-十二烷基硫酸钠发泡二氧化碳泡沫稳定性的影响

在线全文

学校读者我要写书评

暂无评论

石油勘探与开发 2024年第1期51卷 212-222页

作者： SADEGHI Hossein KHAZ'ALI Ali Reza.mohammadi Mohsen 伊斯法罕理工大学化学工程系伊朗伊斯法罕84156-83111 丹麦技术大学丹麦海洋工程技术中心丹麦灵比2800

采用十二烷基硫酸钠(SDS)表面活性剂和SiO_(2)纳米颗粒作为发泡体系,在不同原油沥青质含量下进行泡沫稳定性实验,测量CO_(2)泡沫半衰期;采用扫描电子显微图像、紫外分光光度法测试和Zeta电位测量,分析沥青质降低CO_(2)泡沫稳定性的机理... 详细信息

采用十二烷基硫酸钠(SDS)表面活性剂和SiO_(2)纳米颗粒作为发泡体系,在不同原油沥青质含量下进行泡沫稳定性实验,测量CO_(2)泡沫半衰期;采用扫描电子显微图像、紫外分光光度法测试和Zeta电位测量,分析沥青质降低CO_(2)泡沫稳定性的机理。研究表明:当合成油与发泡体系质量比为1∶9时,合成油沥青质质量分数从0增至15%,SDS稳定泡沫半衰期从751 s减少至239 s,SDS-SiO_(2)稳定泡沫半衰期从912 s缩短至298 s;当合成油与发泡体系质量比为2∶8时,随着沥青质质量分数增大,SDS稳定泡沫半衰期从526 s缩短至171 s,SDS-SiO_(2)稳定泡沫半衰期从660 s缩短至205 s。由于沥青质与SDS和SiO_(2)纳米颗粒在水相中的相互作用,Zeta电位绝对值减小,颗粒表面电荷降低,导致薄液膜两侧界面之间的排斥力减小,从而破坏泡沫稳定性。

关键词： CO_(2)泡沫泡沫稳定性沥青质二氧化硅纳米颗粒十二烷基硫酸钠(SDS) 排斥力表面电荷 Zeta电位