46 research outputs found
COMPORTAREA SOIURILOR DE PRUN ÎN PERIOADA DE FRUCTIFICARE ÎN ZONA DE NORD A REPUBLICII MOLDOVA
No full textThis study evaluated the growth, development and productivity of plum trees in an intensive cropping system during the fructification period. The research was carried out in 2024 in the plantation of the enterprise SRL “Agrofields”, founded in the spring of 2018, with 6 plum varieties of the European assortment: Piteșteanca (control), Cacanska Najbolia, Empresso, Stanley, Blue Free and President, grafted on the Myrobalan seedling rootstock, tree spacing 5.0x3.0 m, with improved pyramid-shaped crown. During the research, trunk diameter and growth, trunk cross-sectional area, phenological phases, productivity of the plantation and fruit weight as well as yield per unit cross-sectional area were studied. Trunk diameter increment was largely influenced by plum production in the crown as well as by the biological characteristics of the variety. At the end of the growing season of 2024 the trunk diameter increment ranged from 8.3 mm (President) to 9.9 mm (Cacanska Najbolia). The onset of flowering took place over 6 days. The varieties Cacanska Najbolia and President were characterized by early flowering (05.04.2024). The varieties Piteștean and Stanley were characterized by later flowering (10.04.2024). The ripening phenophase started 103 days after flowering for the earliest variety Piteștean and 152 days after for President. The lowest mean fruit weight was recorded for Stanley (38.8 g), and the highest for President (54.7 g). It was established that the varieties under study allow to obtain yields from 11.7 to 25.4 t/ha of competitive quality, distributed over 45 harvesting days
Produsele educaţionale „DicEl” şi „RecitalMaster”: aspecte de elaborare şi implementare pentru studierea limbii române în şcoala naţională
No full textThis article describes the own concept's educational apps - "DicEl" and "RecitalMaster" - developed by the author for studying of Romanian language. There is a comparative analysis overview of current programs ("DicEl" and "RecitalMaster") with other projects, having the same destination here. Proposed educational software are applicable under a self-study of student-teacher contact, and fully or partially or remotely. The author estimates possibilities of given educational product submitting experimental results of its implementation in the Romanian language study in the national schools
Quantifying secondary particle dose contributions in proton therapy
No full textIn order to create radiotherapy treatment plans for cancer patients, dose calculations need to be done as quickly as possible to get accurate results. However, current dose calculation algorithms take too much time to be deployed effectively. The current in house algorithm of the Medical Physics and Technology Section at the TU Delft, attempts to solve this problem by utilising a deterministic algorithm that has a significant time advantage over Monte Carlo algorithms. However, this comes with the cost of inaccuracy, one of which is that it assumesall dose is deposited locally along the beam path. This is inaccurate as secondary particles created from non-elastic nuclear interactions can deposit their dose far from the beam path due to retaining significant kinetic energy. This thesis attempts to reduce this inaccuracy by mapping and quantifying the secondary particles to assess their contribution in non-local dose deposition. And analysing the relevant particle’s energy and angle distributions to gain insight into the development of the particle's characteristics with depth. Thereafter the relevantparticle’s are then utilised as a source to emulate their production in a primary proton beam at different depths to obtain the relevant 3D dose distributions. The analysis concluded that secondary protons are the most relevant secondary particle as they contribute to 88% of the secondary dose and have a significant range to deposit their dose non locally. By utilising the secondary protons as a source, it was found that the relative error between the integrated depth dose (IDD) of the scored protons and the IDD obtained directly from Monte Carlo simulations is equal to 5.1% in the z-direction and 3.4% in the x and y-direction. The absolute difference was found to be 1.54 × 10−5 Gy which is equal to 0.096% of the total dose and 2.75% of the dose contributed by all secondary particles. The results show that the methodology can produce accurate 3D dose matrices for secondary protons at different depths, which can then be used to improve the accuracy of the in house algorithm by adding the precalculated 3D dose matrices to the algorithmApplied Physic
The inclusion of secondary protons via convolutional methods
No full textDose calculations in proton therapy need to be computed as fast as possible for successful cancer treatment planning and execution. The dose calculation algorithms that provide enough accuracy for treatment planning, takes too much time to utilise; therefore there is a need for faster alternatives. One of the alternatives is using a deterministic semi-analytic numerical algorithm for EM interactions. This alternative in its current state is not accurate enough, and therefore it is sought to include the effects of secondary protons on the total dose distribution of the deterministic semi-analytic numerical algorithm, using convolutional methods. In this thesis an attempt is made to find a kernel that, when convoluted with a primary proton flux, produces the desired secondary proton dose. The parameters of two different types of kernels, the Gaussian kernel and Fractional Filter kernel, are optimised and their resulting shapes are presented. Furthermore, the secondary proton dose through the convolution of the primary proton flux and the different kernels are presented. The doses obtained from the optimal kernels are compared with the target dose on the shape and a measure of quality: the gamma index passing rate. Found was that the Fractional Filter kernel can produce both asymmetric doses and symmetric doses, while the Gaussian kernel can only produce symmetric doses. The passing rate was found to be 29.41% for the Fractional Filter kernel and 17.65% for the Gaussian kernel. Thus, the Fractional Filter is better for estimating secondary proton dose distribution through convolutional methods than using a Gaussian kernel. but insufficient due to the low passing rate. A suggestion for improvement is applying skew-Gaussians in the Fractional Filter kernel or by applying other asymmetric kernels.Applied Physic
Educational software: Linguistic Training method for foreign languages' speakers
No full textThis article describes the educational applications of own conception ("DicEl" and "RecitalMaster") developed by the author for studying the Romanian Language by language regions' people via of other close themed projects. Proposed educational software are applicable in the conditions of: self-study; student-teacher contact (full and-or partial, or at the distance). These elaborations are absolutely adaptable for studying other foreign languages
LUNG HERNIATION FOLLOWING BLUNT THORACIC TRAUMA: CASE REPORT
No full textIntroduction. Lung herniation following blunt force is a very rare occurrence of thoracic trauma with very few reported cases in medical literature. It can be defined as a protrusion of the pleural-covered parenchyma of the lung through an abnormal defect or chest wall weakness. It can also appear following thoracic surgery and can be classified based on location as parasternal, intercostal and supraclavicular.
Case Presentation. A 60-year-old male was admitted to our hospital by emergency services following blunt thoracic trauma to head, chest, abdomen and lower and upper extremities. Upon admission, chest Computed Tomography was performed that showed a small herniation of left lung through 4th intercostal space and close to left parasternal line. He underwent surgical intervention for closure of lung hernia by mini-access thoracoplasty. There were no signs of recurrence after one month and three months of follow-up.
Conclusions. Being a rare pathology, lung herniation is often overlooked in initial patient assessment, especially in a polytrauma patient where many clinical signs can often overlay one another. There is still no consensus regarding the surgical treatment of a pulmonary hernia. This can be done directly (primary) or delayed (secondary) and depends on the clinical condition of the patient
A Deterministic Adjoint-Based Semi-Analytical Algorithm for Fast Response Change Computations in Proton Therapy
No full textIn this paper we propose a solution to the need for a fast particle transport algorithm in Online Adaptive Proton Therapy capable of cheaply, but accurately computing the changes in patient dose metrics as a result of changes in the system parameters. We obtain the proton phase-space density through the product of the numerical solution to the one-dimensional Fokker-Planck equation and the analytical solution to the Fermi-Eyges equation. Moreover, a corresponding adjoint system was derived and solved for the adjoint flux. The proton phase-space density together with the adjoint flux and the metric (chosen as the energy deposited by the beam in a variable region of interest) allowed assessing the accuracy of our algorithm to different perturbation ranges in the system parameters and regions of interest. The algorithm achieved negligible errors ((Formula presented.)) for small Hounsfield unit (HU) perturbation ranges (–40 HU to 40 HU) and small to moderate errors (3% to 17%)–in line with the well-known limitation of adjoint approaches–for large perturbation ranges (–400 HU to 400 HU) in the case of most clinical interest where the region of interest surrounds the Bragg peak. Given these results coupled with the capability of further improving the timing performance it can be concluded that our algorithm presents a viable solution for the specific purpose of Online Adaptive Proton Therapy.RST/Medical Physics & TechnologyRST/Reactor Physics and Nuclear Material
Aspecte de evaluare a activității studenților la lecțiile de seminar: probleme și soluții
No full textGiven paper is presented as a theoretical-applied study that falls within the scientific dimensions of the theory and methodology of didactic evaluation. The author uses descriptive and analytical research methods; comes with the literature review relevant to the stated topic; describes a formative assessment tool based on applying criteria and descriptors that could be implemented in the educational activities specific to the seminar classes within the university study programs with specializations in the field of Computer Science and ICT, but not only. The research's aim is to provide the university teachers and, not only, some methodological guidelines that would support them in developing and implementing a personal, descriptive tool for measuring the activity of the learner in the stated didactical circumstances.Given paper is presented as a theoretical-applied study that falls within the scientific dimensions of the theory and methodology of didactic evaluation. The author uses descriptive and analytical research methods; comes with the literature review relevant to the stated topic; describes a formative assessment tool based on applying criteria and descriptors that could be implemented in the educational activities specific to the seminar classes within the university study programs with specializations in the field of Computer Science and ICT, but not only. The research's aim is to provide the university teachers and, not only, some methodological guidelines that would support them in developing and implementing a personal, descriptive tool for measuring the activity of the learner in the stated didactical circumstances
LUNG HERNIATION FOLLOWING BLUNT THORACIC TRAUMA: CASE REPORT
No full textIntroduction. Lung herniation following blunt force is a very rare occurrence of thoracic trauma with very few reported cases in medical literature. It can be defined as a protrusion of the pleural-covered parenchyma of the lung through an abnormal defect or chest wall weakness. It can also appear following thoracic surgery and can be classified based on location as parasternal, intercostal and supraclavicular.
Case Presentation. A 60-year-old male was admitted to our hospital by emergency services following blunt thoracic trauma to head, chest, abdomen and lower and upper extremities. Upon admission, chest Computed Tomography was performed that showed a small herniation of left lung through 4th intercostal space and close to left parasternal line. He underwent surgical intervention for closure of lung hernia by mini-access thoracoplasty. There were no signs of recurrence after one month and three months of follow-up.
Conclusions. Being a rare pathology, lung herniation is often overlooked in initial patient assessment, especially in a polytrauma patient where many clinical signs can often overlay one another. There is still no consensus regarding the surgical treatment of a pulmonary hernia. This can be done directly (primary) or delayed (secondary) and depends on the clinical condition of the patient
Pulmonary hydatid disease complicated with spine invasion: a case report
No full textScopul lucrării. Boala hidatică sau hidatidoza este cea mai răspândită zoonoză cauzată de Echinococcus granulosus. Ficatul și
plămânii sunt cele mai frecvente localizări. Afectarea osoasă este rară și este raportată în 0,5-4%, cu afectarea coloanei vertebrale
raportată în 50% din aceste cazuri.
Materiale și metode. Prezentăm un caz de hidatioză pulmonară cu afectare vertebrală la un bărbat de 38 de ani care prezenta
dispnee inferioară, fatigabilitate, pierdere în greutate, slăbiciune și amorțeală a extremităților și dureri de spate. Pacientul are un
istoric de 8 intervenții chirurgicale pentru boala hidatică pulmonară de la vârsta de 8 ani. Imagistica prin rezonanță magnetică (IRM) a
plămânilor și a coloanei vertebrale a arătat multiple leziuni chistice în fi ndrul pulmonar drept și la nivelul T5-T8, cu afectarea mușchilor
paraspinali. Leziunea a fost văzută epidurală cu compresie medulară.
Rezultate. Pacientul a fost supus exciziei chisturilor hidatice pulmonare, iar segmentul spinal a fost abordat de către chirurgii spinali,
iar chisturile excizate au prezentat trăsături caracteristice chistului hidatic (HC) la histopatologie.
Concluzii. Pacientul a fost inițiat pe tratament antihelmintic postoperator. Evoluția postoperatorie nu a fost remarcabilă. La un an de
la operație, pacientul a fost supus unui CT și unui RMN cu remisiune completă.Aim of study. Hydatid disease or hydatidosis is the most widespread zoonosis caused by Echinococcus granulosus. Liver and lungs
are the most common sites. Bone involvement is rare and reported in 0.5–4% with spinal involvement reported in 50% of these cases.
Materials and methods. We present a case of pulmonary hydatiosis with spinal involvement in a 38-year-old male presenting with
lower dyspnea, fatigability, weight loss, extremity weakness and numbness and back pain. The patient has a history of 8 surgical
interventions for pulmonary hydatid disease from 8 years of age. Magnetic resonance imaging (MRI) of the lungs and spine showed
multiple cystic lesions in the right lung field and at the T5–T8 level with involvement of the paraspinal muscles. The lesion was seen
epidural with medulla compression.
Results. The patient underwent excision of lung hydatid cysts and spinal segment was approached by spinal surgeons, and the
excised cysts showed characteristic features of hydatid cyst (HC) on histopathology.
Conclusions. The patient was started on antihelminthic therapy postoperatively. Postoperative evolution was unremarkable. One year
after surgery the patient underwent CT and MRI with complete remission
