Experimental Investigation and Quantum Chemical Calculations of Some (Chlorophenyl Isoxazol-5-yl) Methanol Derivatives as Inhibitors for Corrosion of Mild Steel in 1 M HCl Solution

Moosa Es’haghi,Rogayeh Sadeghzadeh,Ladan Ejlali,Hadi Basharnavaz,Kambiz Seyyedi 한국부식방식학회 2019 Corrosion Science and Technology Vol.18 No.5

In this study, two novel Schiff base compounds including (3-(4-Chlorophenyl isoxazole-5-yl) methanol and(3-(2,4 dichlorophenol isoxazole-5-yl) methanol as corrosion inhibitors for mild steel in 1 M hydrochloricacid solution were investigated by potentiodynamic polarization, electrochemical impedance spectroscopy(EIS), and density functional theory (DFT) computations. The results showed that the corrosion inhibitionefficiency (IE) is remarkably enhanced with the growing concentration of the Schiff base inhibitors. Theresults from Tafel polarization and EIS methods showed that IE decreases with gradual increments of temperature. This process can be attributed to the displacement of the adsorption/desorption balance and hence to thediminution of the level of a surface coating. Also, the adsorption of two inhibitors over mild steel followedthe Langmuir adsorption isotherm. Too, the results of the scanning electron microscope (SEM) images showedthat the Schiff base inhibitors form an excellent protective film over mild steel and verified the resultsby electrochemical techniques. Additionally, the results from the experimental and those from DFT computationsare in excellent accordance.

Novel Zero-Voltage-Switching Bridgeless PFC Converter

Haghi, Rasool,Zolghadri, Mohammad Reza,Beiranvand, Reza The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.1

In this paper, a new zero-voltage-switching, high power-factor, bridgeless rectifier is introduced. In this topology, an auxiliary circuit provides soft switching for all of the power semiconductor devices. Thus the switching losses are reduced and the highest efficiency can be achieved. The proposed converter has been analyzed and a design procedure has been introduced. The control circuit for the converter has also been developed. Based on the given approach, a 250 W, 400 Vdc prototype converters has been designed at 100 kHz for universal input voltage (90-264 Vrms) applications. A maximum efficiency of 94.6% and a power factor correction over 0.99 has been achieved. The simulation and experimental results confirm the design procedure and highlight the advantages of the proposed topology.

14-bp Insertion/Deletion Polymorphism of the HLA-G gene in Breast Cancer among Women from North Western Iran

Haghi, Mehdi,Feizi, Mohammad Ali Hosseinpour,Sadeghizadeh, Majid,Lotfi, Abbas Sahebghadam Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.14

Background: The human leukocyte antigen-G (HLA-G) gene is highly expressed in cancer pathologies and is one strategy used by tumor cells to escape immune surveillance. A 14-bp insertion/deletion (InDel) polymorphism of the HLA-G gene has been suggested to be associated with HLA-G mRNA stability and the expression of HLA-G. The aim of present study was to assess any genetic association between this polymorphism and breast cancer among Iranian-Azeri women. Materials and Methods: In this study 227 women affected with breast cancer, in addition to 255 age-sex and ethnically matched healthy individuals as the control group, participated. Genotyping was performed using polymerase chain reaction and electrophoresis assays. The data were compiled according to the genotype and allele frequencies, compared using the Chi-square test. Statistical significance was set at P<0.05. Results: In this case-control study, no significant difference was found between the case and control groups at allelic and genotype levels, although there is a slightly higher allele frequency of HLA-G 14bp deletion in breast cancer affected group. However,when the stage I subgroup was compared with stage II plus stage III subgroup of affected breast cancer, a significant difference was seen with the 14 bp deletion allele frequency. The stage II-III subgroup patients had higher frequency of deletion allele (57.4% vs 45.8%) than stage I cases (${\chi}^2=4.16$, p-value=0.041). Conclusions: Our data support a possible action of HLA-G 14bp InDel polymorphism as a potential genetic risk factor for progression of breast cancer. This finding highlights the necessity of future studies of this gene to establish the exact role of HLA-G in progression steps of breast cancer.

SWOT Analysis for Iran’s National Innovation System based on Norwegian and Korean Experiences

Seyedreza Haghi 한국유통과학회 2013 The Journal of Industrial Distribution & Business( Vol.4 No.2

Purpose - The objectives of this study are to find the strengths, weaknesses, opportunities, and threats related to the national innovation system of Iran (using a SWOT analysis) and to extract some strategic recommendations to modify the innovation policies of Iran. Research design, data, and methodology - This study used a literature review and field study. In the first phase, the author studied library resources and articles, and browsed through Internet information about the subject. The second phase was a field research investigation through designed questionnaires and interviews with more than 100 policymakers, officials, executives, and others related to the national innovation system in 2011. Results - In this research study, strategic recommendations were extracted through a SWOT model for improvements to the innovation policies of Iran. Conclusions - The findings of this study show the role of strengths, weaknesses, opportunities, and threats in the national innovation system of Iran and suggest strategic recommendations for its modification.

Novel Zero-Voltage-Switching Bridgeless PFC Converter

Rasool Haghi,Mohammad Reza Zolghadri,Reza Beiranvand 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.1

In this paper, a new zero-voltage-switching, high power-factor, bridgeless rectifier is introduced. In this topology, an auxiliary circuit provides soft switching for all of the power semiconductor devices. Thus the switching losses are reduced and the highest efficiency can be achieved. The proposed converter has been analyzed and a design procedure has been introduced. The control circuit for the converter has also been developed. Based on the given approach, a 250 W, 400 Vdc prototype converters has been designed at 100 kHz for universal input voltage (90-264 Vrms) applications. A maximum efficiency of 94.6% and a power factor correction over 0.99 has been achieved. The simulation and experimental results confirm the design procedure and highlight the advantages of the proposed topology.

SWOT Analysis for National Innovation System of Iran based on Norwegian and Korean Experiences

Seyedreza Haghi 한국유통과학회 2013 KODISA ICBE (International Conference on Business Vol.2013 No.-

In this article, Norwegian, and Korean Innovation policies are reviewed. In Norway, six levels in the policy system organizational map of the NIS (National Innovation System) found. In South Korea, Strengths, Weaknesses, Opportunities and Threats analysis based on OECD studies have been listed. This article focuses on innovation policies in Iran. In this research study, on the results of a series of interviews with major stakeholders in Iran's innovation system, Strengths, Weaknesses, Opportunities and Threats analysis have been listed and then some of strategic recommendations have been extracted to modify the Innovation policies of Iran.

Wearable Devices in Medical Internet of Things: Scientific Research and Commercially Available Devices

Mostafa Haghi,Kerstin Thurow,Regina Stoll 대한의료정보학회 2017 Healthcare Informatics Research Vol.23 No.1

Objectives: Wearable devices are currently at the heart of just about every discussion related to the Internet of Things. The requirement for self-health monitoring and preventive medicine is increasing due to the projected dramatic increase in the number of elderly people until 2020. Developed technologies are truly able to reduce the overall costs for prevention and monitoring. This is possible by constantly monitoring health indicators in various areas, and in particular, wearable devices are considered to carry this task out. These wearable devices and mobile apps now have been integrated with telemedicine and telehealth efficiently, to structure the medical Internet of Things. This paper reviews wearable health care devices both in scientific papers and commercial efforts. Methods: MIoT is demonstrated through a defined architecture design, including hardware and software dealing with wearable devices, sensors, smart phones, medical application, and medical station analyzers for further diagnosis and data storage. Results: Wearables, with the help of improved technology have been developed greatly and are considered reliable tools for long-term health monitoring systems. These are applied in the observation of a large variety of health monitoring indicators in the environment, vital signs, and fitness. Conclusions: Wearable devices are now used for a wide range of healthcare observation. One of the most important elements essential in data collection is the sensor. During recent years with improvement in semiconductor technology, sensors have made investigation of a full range of parameters closer to realization.

The electroless plating of Cu-Ni-P alloy onto cotton fabrics

Akbar Khodaparast Haghi,Arezoo Afzali,Vahid Mottaghitalab,Mahmood Saberi Motlagh 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4

The objective of this study is to apply the electroless plating of Cu-Ni-P alloy on cotton fabrics to the preparation of conductive fabrics. The alloy composed of infinit small amount of nickel and phosphorus particle originated from sodium hypophosphite and nickel sulphate respectively as reducing agent and hypophosphite oxidation accelerator. Electroless plating of Cu-Ni-P alloy on cotton fabrics and effect of plating on the physical and mechanical properties of alloy coated fabrics as well as electromagnetic interference (EMI) shielding effectiveness were reported in detail. In this research highly washing and abrasion durable conductive fabrics obtained with supreme shielding effectiveness.

Distance transform algorithm for measuring nanofiber diameter

Akbar Khodaparast Haghi,Mohammad Ziabari,Vahid Mottaghitalab 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4

This paper describes a new distance transform method used for measuring fiber diameter in electrospun nanofiber webs. In this algorithm, the effect of intersection is eliminated, which brings more accuracy to the measurement. The method is tested by a series of simulated images with known characteristics as well as some real webs obtained from electrospinning of PVA. Our method is compared with the distance transform method. The results obtained by our method were significantly better than the distance transform, indicating that the new method could successfully be used to measure electrospun fiber diameter

Simulated image of electrospun nonwoven web of PVA and corresponding nanofiber diameter distribution

Akbar Khodaparast Haghi,Mohammad Ziabari,Vahid Mottaghitalab 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4

Fiber diameter is the most important characteristic in electrospun nonwoven webs. Understanding how it is influenced by the electrospinning parameters is essential to produce webs with desired characteristics. In this contribution, Direct Tracking method for measuring electrospun fiber diameter is described. To evaluate the accuracy of the technique, a simulation algorithm for generating webs with known characteristics was employed. To verify the applicability of the method on real samples, an electrospun polyvinyl alcohol (PVA) mat, as a representative of real webs, was used. Since the Direct Tracking method uses a binary image as its input, local thresholding was applied to segment the SEM micrograph of the electrospun web. The results indicate that the method could be used successfully for determining fiber diameter in electrospun nonwoven webs.