BLUETOOTH APPLICATION FOR TEMPERATURE AND HUMIDITY CONTROL

The paper presents an application that involves the real-time acquisition of two quantities: humidity and temperature; displaying them on a high-resolution OLED screen; activation of a cooling fan when the set temperature value is exceeded; the possibility of setting the reference temperature value through the Android/iOS mobile application, which communicates with the installation via Bluetooth. To create the application, programming algorithms are used that read these quantities in real time using the DTH 11 sensor, an Arduino Uno development board equipped with the Atmega328 microcontroller, using digital and analog pins. Information is displayed on a high-resolution colour OLED screen attached to the Arduino board. From the created mobile Android application, the temperature value to be compared can be set and an LED for ON/OFF status can be ordered

ADVANCED AUTOMATIC SYSTEM FOR REMOTE CONTROL IN THE OIL AND GAS INDUSTRY

The purpose of this work is to design and implement a cascade control system of the level with the flow rate, with remote supervision, in an industrial type installation, located in the Laboratory of Measurement Techniques, Department of Automation, Computers & Electronics, within the Faculty of Mechanical and Electrical Engineering. The operating parameters of the installation are as follows: suction pressure: 0 – 2 bar; discharge pressure: 0 -10 bar; water flow: 0-30 m3/h; transported liquid: water. The automation system is structured on three hierarchical levels: level 1: the instrumentation mounted on the installation (transducers, signaling devices, etc.); level 2: includes the TGA System; level 3: constitutes the upper hierarchical level and includes the HMI (Human Machine Interface). The TGA system is a computerized system that ensures the monitoring, command and control functions of all the stand's component elements. It contains a programmable logic controller PLC 1214 – Siemens, which communicates via an Ethernet IP network with an operator interface and with the network of the Faculty of Mechanical and Electrical Engineering, which allows remote control of the installation. It also includes the protection system in case of failure, which involves stopping the rotating equipment, isolating the pipes by closing the control valve and alarming the operators. The HMI (Human Machine Interface) interface presents 3 options on the start page, from where the operator can select which application he wants to test: flow control loop application; level adjustment loop application; cascade adjustment loop application. The HMI equipment integrates SCADA functions, database update, evolution curves of analog quantities, sound and monitor alarm system, keyboard command, periodic records, event records, alarm records and technological schemes at the human-machine interface. The entire software is made in an open architecture, recommended by ISO norms. The PLC communicates in the network by adopting the protocol TCP/IP. An executable program used for the real-time application program was developed

SUN TRACKING PHOTOVOLTAIC SYSTEM

The purpose of this paper is the design and realization of a prototype system for tracking the position of the sun, with two axes of rotation. The operating principle of the device is based on changing the position of the photovoltaic modules in the direction of the sun's rays, which maximizes the production of electricity. Solar panels with automatic adjustment according to the position of the sun are an innovative solution for optimizing the use of the solar energy. The promotion and use of solar energy is essential in our efforts to protect the planet and ensure a sustainable future

SPIDER4LEGS MOBILE ROBOT DESIGN CONTROLLED BY THE ESP32 PLATFORM

The grazing robot is a dynamic system, consisting of a platform (the body of the robot) and a number of legs with structures similar to the kinematic chains of manipulator robots. Grazing robots can have a redundant number of legs, therefore they can ensure a static stability even if one or more legs are destroyed [10]. The objective of the work is to design a mobile robot controlled with the Arduino board controlled by an ESP 32 logic processor. The robot proposed in the paper is a spider-type robot with four legs, named SPIDER4LEGS. The components used to make the robot are the following: ESP32 development board, ESP ROOM-32, WiFi and Bluetooth BLE, Dual Core; PCA9685 module, I2C interface, 16 CH, servo motor; 12 Servo motors SG90 180 degrees. A possible field of application of these robots is the internal inspection of pipelines transporting petroleum products [7],[8],[9]

Technical efficiency of soil erosion control measures in Şomuzul mic catchment, Suceava Plateau

The purpose of this study is to establish the technical efficiency of soil erosion control measures in the catchment of Somuzul Mic. It is located in the southern part of the Suceava Plateau and occupies approximately 9,600 ha. Natural condition in relation with inappropriate farming techniques causes soil degradation by erosion. Surface erosion and gully erosion occurs on large surface of agricultural land, arable land and pastures representing the most affected land use categories. Somuzul Mic soil erosion control facility is located northeast of Falticeni town and occupies the entire surface of the Somuzul Mic catchment. It is bordered by the Somuzul Mare soil erosion control facility to the west, the Siret river to the east, the Lisaura-Liteni soil erosion control facility to the north and the Dolhasca soil erosion control facility to the south. It was put into operation in 1979 with a capacity of 9,430 ha soil erosion control measures, 28,35 km facilities for controlling gully erosion and 56,40 ha terracing, currently about half of the facilities requiring urgent rehabilitation measures

Technology and devices for liquid pressure pipeline interventions in livestock farms

This technology is used when performing interventions on pipelines through which fluid under pressure is conveyed, in order to extend new networks, or branches, repair damage to pipes, install heat measuring systems, meter water consumption for billing, without interruption of utilities to consumers connected upstream of the point of intervention. Implementing the new technology is based on two devices: tight drilling-cutting device for the pressure pipeline and clogging device of the pressure pipeline. Both devices are successively mounted on a base block, whose boss is welded on the top generator of the pressure pipes, at the point of intervention. Currently, interventions on liquid pressure pipes, regardless their purpose, involve closure of the tower at the nearest point where there are isolation gates, hard to handle or broken, sometimes located in inaccessible places. The technology of intervention presented may be applied on under pressure pipe networks being in static or dynamic operational mode for operational pressures of max. 6 bar and standard nominal diameters of 65, 80, 100, 125, 150 and 200 mm. After performing tests was chosen the obturator with constant thickness of the wall for its constructive simplicity in the conditions in which the operational requirements are fulfilled. The tests demonstrated that the obturator accomplishes its role of interrupting water flow through the pipe in dynamic operational mode at 6 bar, if the pressure from inside it has a value of 10 bar. Application of this new technology has a direct effect on quality of life, allowing elimination of interruptions in drinking water supply utilities, domestic hot water or heat

Factors Impacting SMES' Business Sustainability PostCOVID-19 in Bucharest, Romania, from the Perspective of Resilience

Organizations are undergoing continuous transformations, either due to technological innovation, sustainability practices, various crises (financial crisis, Covid-19), the war in Ukraine, accompanied by changes in regulations specific to each country or required by the pressures of climate change or globalization, so SMEs are constantly faced with problems of various kinds that require an up-to-date assessment of the business, especially when the threats are unpredictable. To stay in business, companies, and consequently their leaders, must adapt and survive with agility when faced with unforeseen or turbulent changes. The general objective is to identify the level of resilience reflected in the corporate sustainability of SMEs in Bucharest in order to strengthen organizational success factors. The study focuses on several resilience factors: leadership, organizational networks and change orientation and the extent to which they impact the business sustainability of SMEs in Bucharest, Romania, in the post COVID-19 period. The method of study is quantitative research in order to achieve the highest level of objectivity, using systematic measurements and statistical analysis. The investigation revealed that of the three structural components, change orientation has the greatest impact on corporate sustainability, followed by organizational networks and leadership. The added value of this study for academia is that the data was collected in Bucharest, Romania, with the aim of contributing to the long-term sustainability of organizations from a resilience perspective. The study is aimed at managers of Romanian SMEs to achieve the sustainability of their company

MEASUREMENT UNCERTAINTY IN LEGAL METROLOGY

In legal metrology, in addition to the elements of the measurement result, the measurement uncertainty is also required in order to establish the level of confidence or risk regarding compliance decisions. Because of this, the uncertainty assessment considers the indicated uncertainty of the utilized measuring device, as well as the uncertainty linked to calibration and any other uncertainties pertaining to how the measuring instrument is utilized in practice. The uncertainty of these readings must also be taken into account if further measures, such as pressure and temperature, are required. The basic concepts of measurement, legal metrology, measurement errors, measurement uncertainty, types of measurement uncertainties, the importance of the mixed models and two case studies in which we obtained different values for the uncertainty were examined in this article. Both of the two case studies that are discussed are the general uncertainty with a backup strategy and the uncertainty for partially transferred source flows. Here, the installation's operating modes, the formulae used to estimate uncertainty, and the procedure for doing so were all described

Clinical aspects, management and outcome of brain arteriovenous malformations: Results with microsurgery first policy

We performed a retrospective study, including patients operated for brain AVMs between 1999 and 2014, in the Clinic of Neurosurgery, Emergency Clinical Hospital Bagdasar-Arseni, Bucharest. 277 patients underwent surgery for brain AVMs. Mean age was 29.82 years. 195 patients (70.40%) presented with hemorrhage and 86 cases (31.05%) were admitted with seizures. We performed total resection of AVMs in 228 cases (82.31%) and subtotal resection in 49 cases (17.69%). Regarding patients with residual nidus, 16 of them underwent second surgery, 27 stereotactic radiosurgery Gamma Knife, 3 embolization and 3 refused further treatment. Modified Rankin Scale (mRS) improved following surgery (Z = -9.248, p = 0.000). Early complications (0-30 days) were encountered in 84 patients (30.32%). We found the following risk factors for postoperative complications occurrence: motor deficit (p = 0.006), co-morbidities (p = 0.023), higher mRS (p = 0.005), lower Karnofsky score (p = 0.003), lower GCS (p = 0.016), profound nidus (p = 0.001), eloquent aria (p = 0.000), large nidus (p = 0.000), multiple arterial territory (p = 0.000), deep feeding arteries (p = 0.000), higher number of feeding arteries (p = 0.000), deep venous drainage (p = 0.000), multiple draining veins (p = 0.000), higher Spetzler-Martin grade (p = 0.006), high flow (p = 0.000), vascular steel (p = 0.000), associated aneurysms (p = 0.010) and decompressive craniectomy (p = 0.019). Mortality was 6.1%. Microsurgery is the treatment of choice for brain AVMs. Surgical results are excellent, with low morbidity and mortality. Patients with poor surgical results belonged to the group admitted with severe altered general state, state of consciousness, massive hematomas and acute brainstem dysfunction. If part of the nidus cannot be safely surgical resected, stereotactic radiosurgery can provide definitive cure of the lesion.Key words: arteriovenous malformations, microsurgery, postoperative complications