Recent Articles

Nanometer zero-valent iron (nZVI) technology is one of the hotspot in environmental science, according to its huge surface area and high reactivity for the heavy metals, halogenated organic matter. However, as a result of a single nZVI problems easy to reunite and oxidized effect of nZVI reactivity, reduction of pollutant removal effect, the modification of nanometer zero-valent iron is a hotspot of nZVI technology this paper mainly discusses the conventional physical and chemical preparation methods of nanometer zero-valent iron and modified nano zero-valent iron technology are summarized, the future research emphases of nZVI technology are prospected.

There had been an increasing security and safety concerns at international terminals since the September 11 incident in the US. In this regards, most related studies seems to be biased towards the developed economics preparedness to enhance and avert possible disaster encountered at the US. However, with the increasing threat being posed on a daily basis on African international terminal especially the Nigerian airport with the rise of Boko Haram and other emerging insurgents threats. This study seeks to examine the perception of international passenger on the safety and security of the Nigerian airport terminal. The methodology involves both the qualitative and the quantitative methods. The data is analysed with descriptive and inferential statistical analytical techniques. The study reveals there is a significant relationship between airport passenger perception of safety and enhanced security level at the airport. Also the passenger nationality status also influences the level of security procedures at the Murtala Mohammed International airport.

Protein-protein interactions (PPIs) and protein complexes formed by interactions are the main accomplishers of various functions of cells. As an important component of biological networks, protein interaction plays an important role in determining life processes such as signal transduction in cells. Although the experimental methods for studying protein interactions are endless, there are still many shortcomings and gaps in the research on the interaction of precisely regulated protein molecules. LOV (Light Oxygen Voltage) is a light-sensitive protein domain originally discovered in the photo of plants for receiving blue light stimulation, transmitting signals, and causing a series of reactions in plants. The LOV domain belongs to a member of the PAS (Per-Arnt-Sim) superfamily and contains two subunits, LOV1 and LOV2. LOV2 is thought to cause a conformational change after receiving light stimulation, primarily responsible for activating the kinase domain. It plays an important role in intracellular signal transduction. In view of the light control and sensitivity of LOV2, which can be used as a research tool in protein interaction processes, the mechanism of action and structural advantages of signal transduction in LOV2 domain in protein interactions are reviewed.

This paper selects the operation data of commercial car insurance of 25 companies in 2012-2016, and calculates the efficiency of commercial car insurance by using SBM-DEA model, also analyzes the main factors affecting the efficiency of commercial car insurance operation by using the Tobit panel data estimation model. The main conclusions are as follows: 1. The overall efficiency value of the commercial insurance company is low, and only 2 of the 25 property insurance companies tested reached the effective frontier, there is still a large space for improvement, the redundancy of low efficiency companies is more serious; In the past three years, the technical efficiency value has remained stable and the upward trend is not obvious. 2. Commercial car insurance premium income share, market share, cost rate, company asset size, all have different degrees of impact on the efficiency value of commercial car insurance.

European diplomacy was in a dominant position after the loss of Soviet influence in the eastern European countries. The Yugoslav crisis was the first challenge for the European Community that could not stop the conflict in the areas of the former Yugoslavia. It did not appear determined in the initial positions of the Yugoslav crisis by attempting to maintain the Yugoslav federation, at a time when it was impossible for the coming of leaders seeking independence from the such federation. The efforts of European diplomats at the London Conference, The Hague, and then onwards to that of Geneva failed to stop the expansion of the conflict towards Kosovo. Where peace was established only when at the same time diplomacy was combined with NATO air force.

In this paper, a DFT- based OFDMA with phase modulation (DFT-OFDMA-PM) system is proposed. The proposed system exploits the advantages of PM, the constant envelope (CE) signal, and the ability to improve the diversity of multipath channels. The performance of the proposed system in terms of bit error rate (BER) is studied and investigated using simulation. An investigation of the proposed system, the DFT-OFDMA-PM, results is carried and compared to the recently proposed DCT-OFDMA-PM system and the conventional systems without PM. Moreover, the key parameter, the modulation index, which affects the performance of the PM systems, is also studied and the optimum value is chosen via simulation. The simulation results for the proposed system show the effectiveness of the proposed system for broadband communications.

The evolution of marketplaces started from the traditional marketplace, the internet marketplace, the web service marketplace, the grid marketplace, before moving to cloud e-marketplace. The need to have rapid access to various service by different customers brought about cloud e-marketplaces. The goal of the cloud e-marketplace is to attract the biggest possible number of buyers while ensuring a reduced waiting time for customers and maximized profit for cloud service providers. Challenges like security, performance and fault tolerance are of great concern in the cloud market. While discussion on the issue of security and performance are ongoing, that of fault tolerance is yet to be fully addressed. Although some researchers have proposed the use of multiple servers in achieving the main idea of the cloud e-marketplace, different kinds of faults still affects the performance of cloud e-market. Balancing of providers’ cost and customers’ waiting time is still a major concern. Various techniques have been proposed in solving these problems. However, these techniques only work in a static environment where these servers can be faulty which may lead to long waiting time. We propose the use of Raft consensus protocol as our fault tolerant approach. We use the dynamic environment as against the already static approached already discussed in the literature. In the dynamic environment, two fault tolerant centers that are capable of surviving failure caused by server overload or congestion are used. These are primary and the reservoir centers. The Raft Consensus Protocol is used in both centers to coordinate the servers and make sure that each of the servers exist either as the leader, a candidate, or a as a follower. A waiting time counter algorithm is developed that directs customers request to the primary center when waiting time t

Objectives: To specify the diagnostic difficulties and the criteria allowing a conservative load taking. Observation: We report a case of abdominal pregnancy with live fetus diagnosed ultrasonically at 23WA in a context of abdominal urgency on the background of secondary amenorrhea with prospective follow-up and birth at 36WA. Ultrasound is essential to diagnosis. The treatment is always surgical and the difficulty is dominated by the removal of the placenta. The fetal prognosis is reserved and the maternal mortality is not negligible. Conclusion: Abdominal pregnancy is a rare event. Her diagnosis is difficult and a conservative attitude of pregnancy is possible.

This study examined the predictive power of Perceived Self-Efficacy and Perceived Social Support on Coping with HIV/AIDS’ Stigma. The study seeks to ascertain whether perceived self-efficacy and perceived social support would predict coping with HIV/AIDS’ stigma among patients. Using a sample of 152, with a total number of males 49 with percentage of 32% and females 103 with a percentage of 68%. Their ages ranged from 18-70 and a mean age of 53 years. This was a survey research and the design adopted was correlational design based on the design a multiple regression analysis was adopted as an appropriate statistical tool for analysis. The multiple regression analysis of the first hypothesis which stated that self-efficacy will significantly predict coping among HIV/AIDS’ patients was confirmed at β= .55; t= 2.47, P

Summary : The objective of this study is to contribute to the knowledge of the immunological and clinical aspects of the male infertility at the University Health Center of Brazzaville. Patients and methods : it was a descriptive, transversal and analytical study over a period ranging from the 1st november 2015 to the 31st october 2016. All patients with infertlity were concerned among them we distinguished between those having agglutinates of sperm in the semen on the one hand (G1) from those who did not have any (G2). So we looked for the presence of the antisperm antibodies in the two groups. Results : During the period of study, 1889 spermograms had been realised, and 67 among them were pathological approximately 3,5 % and among them there were 18% with the ASA. The patients were on average 37,4 +/- 5,8 years old, extreme (27-56 years old). They consulted after a delay of 5,3 +/3,7 years on average, extremes (1-16 years). The infertlity was primary in 50,7% and secondary in 49,3%. As far as the scrotum is concerned, the varicocele was more found in 34,3%. In the spermogram, 18 % had agglutinates of sperm against 82 %. The. oligoasthenozoospermias represented 41,8% followed by azoospermia, 20 %. The stigmata of infection have been noticed, they are alkaline PH (9,9%),many leukocytes (10%) and hyperspermia (0,9%). For the 9 patients who had sperm with antispermatozoïd antibodies, 1 patient had IgA, 2 patients had IgG and 6 patients had both IgA and IgG. The age of those having agglutinates ranged between 50 and 56 years (58,%) versus 30 and 39 years at 60 % (p˂0,05). The story of uro genital infecion was more present. The ASA were more identified in those having agglutinates in 58,33% of cases (p=0,0001). The average of the percentages of the…