La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica最新文献

{"title":"A year of online classes amid COVID-19 pandemic at a Bangladeshi university: Economics students’ experience and suggestions for improvements","authors":"M. Shuchi, S. Tabassum, Mmk Toufique","doi":"10.37074/jalt.2021.4.2.3","DOIUrl":"https://doi.org/10.37074/jalt.2021.4.2.3","url":null,"abstract":"Current works perusing online learning amid the COVID-19 pandemic have several drawbacks, i.e., non-representative sample, closed-ended questions, and ignoring students’ opinions about improvement. Also, most studies were carried out in the first weeks of online classes, and no study focused on university-level economics students. This paper uses a convenience sampling technique and open-ended questions and collects data from 154 university-level economics students who have participated in online learning for a year. According to the findings, advantages of online classes include that students can do classes from home avoiding health risks, easy accessibility, flexibility, cost-saving, reducing the likelihood of semester loss, and learning new technologies. Major disadvantages are network problems, difficulties in understanding the topic, unsuitability for mathematical courses, concentration problems, non-interactive classes, financial constraints, adverse health impacts, device and internet problems. Disadvantages outnumbered advantages. Students made several suggestions: using state-of-the-art digital tools, recording and uploading lectures, resolving internet and network issues, holding classes that comply with a fixed schedule, greater efforts to make the topics easier, reducing class duration, institutional support, and introducing an online assessment system. The study makes several policy suggestions and reveals that 70% of problems can be resolved by the Department, the University, and the University Grants Commission.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83320821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Modeling and Analysis of HTM-Free Heterojunction Solar Cell Using SCAPS-1D","authors":"D. Eli, A. Shuaibu, M.S. Ahmad, Jamila Tasiu","doi":"10.26565/2312-4334-2021-2-11","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-11","url":null,"abstract":"In this research paper, a HTM-free perovskite solar cell (PSC) structure with Titanium (TiO2), methyl ammonium lead triiodide (CH3NH3PbI3) and platinum (pt) as electron transport material (ETM), photon harvester and metal back contact is proposed. Solar Cell Capacitance Simulator (SCAPS-1D) program was used to implement the model and simulation. Effect of parameters such as thickness of ETM, thickness of absorber, doping concentration of ETM & absorber and electron affinity (EA) of ETM were investigated systematically. From the obtained results, it was found that the parameters affect the performance of the solar cell. When the thickness of ETM was varied from 0.02 to 0.10 μm. The results show that photovoltaic parameters decrease with the thickness increase. When the thickness of the absorber was varied from 0.1 to 1.0 μm, the optimized value was found at thickness of 0.4 . When the doping concentration of absorber and EMT were varied from 1010–1017 cm-3 and from 1015–1020 cm-3, the highest values of PCEs were obtained at 1016 cm-3 and 1020 cm-3 for Absorber and ETM. Also when the EA was varied in the range of 3.7 eV to 4.5 eV, the optimized value was at 3.7 eV. Upon optimization of the above mentioned parameters, power conversion efficiency (PCE) was found to be 25.75 %, short circuit current density (Jsc) 23.25 mAcm-2, open circuit voltage (Voc) 1.24 V and fill factor (FF) 89.50 %. The optimized result shows an improvement of ~1.95 times in PCE, ~1.06 times in Jsc, ~1.44 times in Voc and ~1.28 times in FF as compared to the initial device with the following parameters, PCE=13.22 %, Jsc=21.96 mAcm−2, Voc=0.86 V and FF=69.94 %.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78713279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Variational Technique for Thermodynamics of Liquid K(1-x)Rbx Alloys","authors":"R. C. Malan, A. Vora","doi":"10.26565/2312-4334-2021-2-09","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-09","url":null,"abstract":"Liquid K_(1-x) Rb_x binary alloys with various thermodynamical proportions of participating elements are investigated. The properties of thermodynamic interest are included in the study. The internal energy (Fint), Helmholtz free enrgy (FH) and the entropy (S) have been calculated in a concentration range from X=0.0 to X=1.0 increasing in a step of 0.1 in the present work. Apart from the internal energy (Fint), various contributions to this energy are also calculated and separately depicted in the present article. A variational approach has been adopted for the present calculation. A single potential with a set of two parameters is used for the calculation of all properties of the alloys. Static Hartree local field function (H) is used to consider screening effect. Various local field correction functions are used to take into account the exchange and correlation effect. Comparison with experimental data at some concentration shows the good agreement with the presently obtained data. With the help of current results, the applied model potential found very suitable with individual parameters for thermodynamical study. As the present results provide the data even where minimum availability of the experimental findings, it can serve as a data base for the future calculation which deals with thermodynamics of the liquid alloys. Present results allow one to get proportion based tuned properties of the K_(1-x) Rb_x for different requirements.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82294893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mode-Converting Corrugations for Cavities of Second-Harmonic Gyrotrons with Improved Performance","authors":"T. Tkachova, V. Shcherbinin, V. Tkachenko","doi":"10.26565/2312-4334-2021-2-05","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-05","url":null,"abstract":"Mode-converting longitudinal corrugations are used as a means of improving the selectivity properties of cavities for second-harmonic gyrotrons. As an example, 100-kW 0.3-THz second-harmonic gyrotron is considered. For the operating second-harmonic mode and most dangerous first-harmonic competing modes, the eigenvalues, ohmic losses and beam-wave coupling coefficients are investigated with respect to dimensions of a corrugated cavity. The most optimal parameters are found for a gyrotron cavity with mode-converting corrugations, which ensure the widest range of a single mode operation for the 0.3-THz second-harmonic gyrotron. It is shown that, in this range, the gyrotron output power can be increased up to 180 kW. It is found that output mode purity of the 0.3-THz second-harmonic gyrotron falls off due to mode-converting corrugations, which induce undesirable coupling of the operating mode with neighboring Bloch harmonics in the output section of the gyrotron cavity.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90547368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Electron Injection on the Characteristics of a Hollow Cathode Glow Discharge","authors":"","doi":"10.26565/2312-4334-2021-2-13","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-13","url":null,"abstract":"The article presents the results of experimental studies of a glow discharge with a hollow cathode in helium and argon gases using an auxiliary discharge as an electron emitter. The authors proposed to make the electrode common for both discharges in the form of a cylindrical metal mesh. The advantage of this design is explained as follows. The connection between the discharges is carried out through holes in the grid with a geometric transparency of 0.2, which makes it possible not only to smoothly control the glow discharge current, but also to enhance the discharge current. Plasma is known to be one of the most efficient electron emitters; however, its use as a cathode in devices with a glow discharge at low gas pressures is complicated by the fact that a grid with small holes is required to separate the electron flow from the plasma, and it is impractical to use such a system in view of low mechanical strength of the grid Since the hollow cathode works effectively at low gas pressures, the release of an electron flux from the plasma of some auxiliary discharge is possible with much larger holes in the grid separating the plasma and the hollow cathode cavity. In this case, the grid can be made such that it can withstand sufficiently high thermal loads and can operate in typical discharge modes with a hollow cathode. The injection of electrons into the cathode cavity of the glow discharge changes the radial distribution of the glow intensity, the width of the cathode dark space, and other parameters of the plasma in the cathode cavity. The influence of electrons penetrating from the auxiliary discharge into the cathode cavity of the main discharge becomes significant when the current of these electrons is comparable to or exceeds the current of electrons leaving the grid cathode surface as a result of γ-processes. In parallel with the measurement of the optical and electrical characteristics of the hollow cathode glow discharge plasma, measurements of the electron concentration were carried out by the microwave sounding method. The entire current of the auxiliary discharge penetrates into the cavity of the main discharge; however, after acceleration in the cathode dark space, the electrons penetrating from the auxiliary discharge ionize gas atoms and noticeably increase the current of the main discharge. Additional ions formed due to the ionization of the gas by the injected electrons knock out new electrons from the cathode surface, which makes it possible to increase the discharge current.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83352826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"الحماية الجنائية للأمن المجتمعي في التشريع العراقي","authors":"كمال عراك","doi":"10.37940/jrls.2021.2.2.7","DOIUrl":"https://doi.org/10.37940/jrls.2021.2.2.7","url":null,"abstract":"ان تشريع القوانين لا يتم الا لمواجهة خطر يهدد أمن وسلامة المجتمع سواء كان الخطر موجه ضد الانسان نفسه أم الى حقوقه المالية أم الى أي شيءٍ آخر يعد من المقومات الاساسية لديمومة حياة الانسان واستمرارها، كما أن الشعوب لا تتقدم سياسياً واقتصاديًا وثقافيًا ما لم تشاع في مجتمعاتها اجواء السلام والوئام والانسجام، ونبذ الخلافات والنزاعات والصراعات الداخلية التي تهدد السلم والامن المجتمعي والتي تؤدي الى عدم استقرار الدولة، لذلك فقد اتجهت التشريعات الجنائية الى تجريم كل ما يمس سلامة الامن الاجتماعي عن طريق النصوص القانونية التي تعاقب على الافعال والسلوكيات التي من شأنها زعزعة امن المجتمع واستقراره ومنها قانون العقوبات العراقي، الذي نص على عدة جرائم تستهدف السلم والامن الاجتماعي، ونذكر منها جريمتين فقد نص على تجريم كلَّ ما يثير شعور الكراهية والبغضاء بين فئات المجتمع المتعدد دينيا او عرقيًا او مذهبيًا او قوميًا، وكذلك معاقبة كلًّ من يقوم بإثارة الحرب الأهلية والاقتتال الطائفي، وقررت عقوبات شديدة لمرتكبي هذه الجرائم، ولا يشترط تحقق النتيجة الجرمية لقيام الجريمة، إذ إن الجريمة تتحقق بمجرد اقتراف الفاعل نشاطًا اجراميًا يستهدف إثارة شعور الكراهية أو إثارة الحرب الاهلية والاقتتال، حتى إن لم تتحقق النتيجة، كونها من الجرائم الشكلية او جرائم الخطر والتي لا يتصور الشروع فيها فهي اما أن تقع تامة او لا تقع . وعليه فقد حرص قانون العقوبات العراقي النافذ على توفير الحماية اللازمة للمجتمع وتنظيم العلاقات بين أفراده أو طوائفه أو مكوناته المتعددة لا سيما أن المجتمع العراقي متعدد الأطياف، فشدد العقاب على كلَّ اعتداء يستهدف اي فئة او طائفه بسبب انتمائها الديني أو العرقي أو القومي أو المذهبي الكلمات المفتاحية: جرائم الامن المجتمعي، جرائم أمن الدولة الداخلي، جرائم السلم الاهلي، جرائم النسيج الاجتماعي، جرائم تقويض للسلم المجتمعي","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84850789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling and Simulation of Lead-Free Perovskite Solar Cell Using SCAPS-1D","authors":"","doi":"10.26565/2312-4334-2021-2-12","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-12","url":null,"abstract":"In this work, the effect of some parameters on tin-based perovskite (CH3NH3SnI3) solar cell were studied through device simulation with respect to adjusting the doping concentration of the perovskite absorption layer, its thickness and the electron affinities of the electron transport medium and hole transport medium, as well as the defect density of the perovskite absorption layer and hole mobility of hole transport material (HTM). A device simulator; the one-dimensional Solar Cells Capacitance Simulator (SCAPS‑1D) program was used for simulating the tin-based perovskite solar cells. The current-voltage (J-V) characteristic curve obtained by simulating the device without optimization shows output cell parameters which include; open circuit voltage (Voc) = 0.64V, short circuit current density (Isc) = 28.50mA/, fill factor (FF) = 61.10%, and power conversion efficiency (PCE) = 11.30% under AM1.5 simulated sunlight of 100mW/cm2 at 300K. After optimization, values of the doping concentration, defect density, electron affinity of electron transport material and hole transport material were determined to be: 1.0x1016cm-3, 1.0x1015cm-3, 3.7 eV and 2.3 eV respectively. Appreciable values of solar cell parameters were obtained with Jsc of 31.38 mA/cm2, Voc of 0.84 V, FF of 76.94% and PCE of 20.35%. when compared with the initial device without optimization, it shows improvement of ~1.10 times in Jsc, ~1.80 times in PCE, ~1.31 times in Voc and ~1.26 time in FF. The results show that the lead-free CH3NH3SnI3 perovskite solar cell which is environmentally friendly is a potential solar cell with high theoretical efficiency of 20.35%.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83074974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"النظام القانوني لمجلس الخدمة العامة الأتحادي","authors":"ضياء عماد عبد علي","doi":"10.37940/jrls.2021.2.2.5","DOIUrl":"https://doi.org/10.37940/jrls.2021.2.2.5","url":null,"abstract":"مجلس الخدمة العامة الاتحادي في العراق يعد أحد أهم الأجهزة المستقلة في العراق تم النص عليه في المادة (107) من الدستور العراقي لعام 2005م ليتولى تنظيم شؤون الوظيفة العامة الاتحادية، وقد ترك النص الدستوري تنظيم تكوين المجلس واختصاصاته إلى قانون يسن من قبل السلطة التشريعية لهذا الغرض، وبالفعل صدر قانون مجلس الخدمة العامة الاتحادي رقم (4) لسنة 2009م المعدل ليضع التفصيلات لهذا المجلس الحيوي والمهم. فقد أعيد العمل بمجلس الخدمة العامة للضرورة الملحة في ظل غياب المعايير اللازمة في مجال الوظيفة العامة وما يرتبط بها والغبن الذي لحق بشرائح مختلفة من أفراد المجتمع، ولحاجة مؤسسات الدولة إلى وجود جهة تنظم شؤون الوظيفة العامة وتضع القواعد الأساسية لتلك المؤسسات على أساس الكفاءة والمهنية لتحقيق المصلحة العامة، فوجود جهة مستقلة تضمن تحقيق العدالة الاجتماعية والشفافية بات أمرًا ضروريًا، وعليه يعقد الأمل على مجلس الخدمة العامة الاتحادي لتحقيق ذلك. الكلمات المفتاحية: النظام، مجلس الخدمة العامة الاتحادي، الاستقلال، الدستور، القانون، الوظيفة العامة","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74602400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on Electrical Properties of Solid Polymer Sheets (HDPE AND LDPE) at Audio Frequency Range","authors":"","doi":"10.26565/2312-4334-2021-2-10","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-10","url":null,"abstract":"Two different groups of solid polymer sheets: low density polyethylene (LDPE) sample of thickness 0.006 cm and 0.007 cm along with high density polyethylene (HDPE) sample of the thickness of 0.009 cm, 0.010 cm were taken in this work. The measurement of electrical properties such as dielectric constant, ε' and dielectric loss, ε'' for LDPE and HDPE polymer sheets have been measured using a dielectric cell. The dielectric cell has been fabricated which consists of two circular parallel plates of pure stainless steel each of 5 cm diameter and 2 mm thickness. An impedance bridge (GRA 650A) was used for measurement of capacitance, C, and dissipation factor, D in the audio frequency (AF) range, 100 Hz to 10 kHz. Different samples were loaded in between the two plates of the cell and the capacitance as well as the dissipation factor were estimated from the dial readings of the bridge. Effect of frequency variation on ε', ε'', relaxation time, τ , dissipation factor, tanδ and ac conductivity, σ were also discussed at audio frequency range. The complex permittivity, ε*, related to free dipole oscillating in an alternating field and loss tangent, tanδ were calculated. The frequency-dependent conductivity, dielectric behavior, and electrical modulus, both real (M') and imaginary (M\") parts of LDPE and HDPE have been studied in this work. The values of the real part of the electrical modulus (M') did not equal to zero at low frequencies and it is expected that the electrode polarization may develop in both sheets. These findings reveal an increased coupling among the local dipolar motions in a short-range order localized motion. The analysis of real (ε') and imaginary (ε'') parts of dielectric permittivity and that electrical modulus real (M') and imaginary (M\") parts signify poly dispersive nature of relaxation time as observed in Cole-Cole plots.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78159005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of Molecular Mechanisms of Radiation Adaptive Response Formation","authors":"","doi":"10.26565/2312-4334-2021-2-16","DOIUrl":"https://doi.org/10.26565/2312-4334-2021-2-16","url":null,"abstract":"The phenomenon of adaptive response is expressed in the increase of resistance of a biological object to high doses of mutagens under the conditions of previous exposure to these (or other) mutagens in low doses. Low doses of mutagen activate a number of protective mechanisms in a living object, which are called hormetic. Thus, the adaptive response and hormesis are links in the same chain. Radiation hormesis refers to the generally positive effect of low doses of low LET radiation on biological objects. The phenomenology of radiation-induced adaptive response and radiation hormesis for biological objects of different levels of organization is considered; the review of existing theories describing the dose-effect relationship has been reviewed. The hypothesis proposing one of the mechanisms of formation of radiation adaptive response of cells taking into account the conformational structure of chromatin has been submitted. The analysis of modern concepts of the phenomenon of hormesis on the basis of modeling of molecular mechanisms of formation of hormetic reactions to low-dose low LET radiation has been carried out. The parameters that can be used for quantitative and graphical evaluation of the phenomenon of hormesis was considered, and a formula for calculating the coefficient of radiation-induced adaptive response has been proposed. A review of mathematical models describing the radiation relative risk of gene mutations and neoplastic transformations at low-dose irradiation of cohorts has been performed. The following conclusions have been made: radiation hormesis and adaptive response are generally recognized as real and reproducible biological phenomena, which should be considered as very important phenomena of evolutionarily formed biological protection of living organisms from ionizing radiation. The hormesis model of dose-response relationship makes much more accurate predictions of a living object's response to radiation (or other stressors) in the low-dose range than the linear threshold (LNT) model does. The LNT model can adequately describe reactions only in the region of high doses of radiation, and, therefore, extrapolation modeling of biological object’s reactions from the zone of high doses to low doses is not correct.","PeriodicalId":78400,"journal":{"name":"La Ricerca scientifica. 2. ser., pt. 2: Rendiconti. Sezione B: Biologica","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89883093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}