فصلنامه کهربا
سال دوازدهم شماره 41 (پاییز 1402)

The sound of the human fetal heart can be heard from the fourteenth week of pregnancy in thin women and in the twentieth week in all pregnant women. If this sound is not heard, the fetus may die; Therefore, in these cases, the doctor uses a Sony Kid device to check the health of the fetus. In this article, an attempt has been made to briefly examine the overall structure and proper functioning of this device and to show the benefits of this device in diagnosing the health and survival of the fetus.

A new photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR) phenomenon is proposed. In terms of chemical stability of the active plasmonic material gold (Au) and the sensor layer outside the fiber structure, it is used to simplify the sensor configuration. The proposed sensor can detect unknown analytes flowing on the metal surface or dripping on the outer surface of the metal layer. The proposed sensor consists of symmetrical circular air holes. Two small air holes are used in the second ring. which helps to generate the field and also helps to adjust the phase matching between the guided state of the nucleus and the surface plasmon teppolaritons (SPP). Surface plasmons are excited along the metal surface by the guided mode of the leakage-like Gaussian kernel. The guiding properties and the sensing performance are numerically investigated by the Finite Element Method (FEM). A perfectly matched circular layer is used to absorb the radiation towards the surface. The sensor offers a maximum sensitivity of 1000nm/RIU with a sensor resolution of less than 1×〖10〗 ^(-4) RIU.The proposed sensor design shows promising results that can be used in the detection of biological and biochemical analytes.

The purpose of this article is to identify and prioritize the factors affecting the effective implementation of the distribution network equipment construction plans of the Khuzestan Electricity Distribution Company. In the framework of examining the mentioned hypotheses, a conceptual model was developed and in this model, independent variables are managerial factors (including the components of leadership, planning, organization and control), motivational factors (including the components of appointments and job promotion, creativity and innovation, employee participation, Equal opportunity and training and promotion of employees (and support factors (including hardware and software factors) were divided and the effective implementation of distribution network equipment construction plans was also introduced as a dependent variable. In order to collect information for testing the mentioned model, a questionnaire was used that dealt with the statistics and testing of demographic information, the statistics and testing of the components of managerial factors, motivational factors and supporting factors. One of the other tools of data collection, with the help of which the researcher can get a deeper evaluation of the perceptions, attitudes, interests and subjects, was the interview, and for this purpose, from the results of the interview in reviewing and analyzing and completing the proposed model and analyzing the problems and some necessary suggestions was used.

In recent years, very appropriate measures have been taken to reduce losses and shutdowns in distribution networks. Substitution of self-supporting cables instead of bare copper wires in order to reduce losses and theft from networks, removing weak pressure networks or reducing their feeding radius, controlling and optimizing connections in networks and many other measures that have been taken have caused casualties in 1989. And 90, in total, the country's distribution networks decreased by about 7% and reached from about 23% at the end of 2008 to about 16% at the end of 2010[5], which is a very hopeful trend. Losses in Mashhad electricity distribution company at the end of 2010 was less than 12%, which is more than 4% better than the national average [5]. One of the factors that has been effective in this loss reduction is the optimization of connections in medium pressure networks, especially the use of bushings instead of locks and fasteners and the complete elimination of connections in these networks. This action, which started in Mashhad electricity about ten years ago, in addition to reducing losses, improves the stability of networks and reduces blackouts, especially blackouts that are caused by burning or opening the connection from the jumper, loosening of the lock and occurrence of arcing or The rupture of the conductor occurs at the connection point

To map the second layer of the network, we must use the vulnerability of internal routing protocols to know what systems are served inside a router, these vulnerabilities can be specified for the RIP protocol on port 520 and for OSPF on port 89 and only It is enough to create a program to interact with these protocols using its client, the details of which are available in the SCAPY library, as well as another protocol for mapping and sending datagrams outside the network, such as ICMP and ARP protocols, which are in the UDP segment. They are used. In the network, we use authentication services to discover hosts under the data link layer, and routing protocols for the network layer, and cryptographic protocols for host authentication for the transmission layer, all of which are included in the above. It can help us in identifying a host or system, and the most important issue is sending datagrams to the selected route and identifying many vulnerabilities that exist, it can help us in identifying the behavior of a system, because for each port, a script for There is bypassing the authentication process; In this article, we examine the set of techniques that lead to the identification of IPs that feed from a router, system or modem. This method can be used in a global network or a NAT.

In this article, a new method for obtaining the objective function of the economic distribution problem in a set of wind and thermal power plants is presented. With the increasing penetration of wind power plants in the power system, due to the unpredictable nature of the output power of these power plants, the issue of economic distribution has become more complicated. The problem of forecasting the amount of wind power generation causes additional costs to be considered when evaluating the economic distribution. In the method presented in this article, the storage cost and additional cost are defined in the objective function of the economic distribution problem of a set of wind and thermal power plants using the average wind energy density.