Teaching Theoretical Physics: the cases of Enrico Fermi and Ettore Majorana

We report on theoretical courses by Fermi and Majorana, giving evidence of the first appearance and further development of Quantum Mechanics teaching in Italy. On the basis of original documents, we make a comparison between Fermi's and Majorana's approaches. A detailed analysis is carried out of Fermi's course on Theoretical Physics attended by Majorana in 1927-28. Three (previously unknown) programs on advanced Physics courses submitted by Majorana to the University of Rome between 1933 and 1936 and the course he held in Naples in 1938 complete our analysis: Fermi's phenomenological approach resounded in Majorana, who however combined it with a deeper theoretical approach, closer to the modern way of presenting Quantum Mechanics.Comment: latex, 21 pages; a contribution in the centenary of the birth of Ettore Majoran

Occurrence of acute oesophageal necrosis (black oesophagus) in a single tertiary centre

Acute oesophageal necrosis (AON) is a rare condition characterised by the endoscopic finding of diffuse, circumferential, black mucosal pigmentation of the oesophagus, which typically stops at the gastro-oesophageal junction. This observational study aimed to assess the occurrence, clinical characteristics and outcomes of AON in a consecutive endoscopic cohort in a single tertiary university centre. A retrospective analysis of endoscopic data of upper gastrointestinal endoscopy (UGE) was carried out from 2008 to 2018. Out of 25,970 UGE, 16 patients (0.06%) had AON; 75.0% were men with a median age of 75 years. Almost all patients underwent diagnosis during emergency UGE performed for gastrointestinal bleeding, but one patient was diagnosed during elective UGE for persistent vomiting and diarrhoea. All patients reported one or more pre-existing comorbidities and concomitant acute events. Two patients had AON as the first presentation of Zollinger-Ellison syndrome (ZES). One patient developed an oesophageal stenosis, and another patient presented a relapse of AON. Mortality was 50%, but no patient died as a direct consequence of AON. AON is a rare cause of gastrointestinal bleeding diagnosed mainly during emergency UGE. Our study showed that ZES might manifest with this critical presentation, and endoscopists must be aware of this evidence

Occurrence of gastric cancer and carcinoids in atrophic gastritis during prospective long-term follow up

Objective. Atrophic gastritis (AG) is a risk condition for gastric cancer and type I gastric carcinoids. Recent studies assessing the overall risk of gastric cancer and carcinoids in AG at long-term follow up are lacking. This study aimed to investigate in a prospective cohort of AG patients the occurrence of gastric cancer and carcinoids at long-term follow up. Methods. A total of 200 AG patients from a prospective cohort (67% female, median age 55 years) with a follow up of 7.5 (range: 4-23.4) years were included. Inclusion criteria were presence of AG and at least one follow-up gastroscopy with biopsies at ≥4 years after AG diagnosis. Follow-up gastroscopies at 4-year intervals were performed. Results. Overall, 22 gastric neoplastic lesions were detected (crude incidence 11%). Gastric cancer was diagnosed in four patients at a median follow up of 7.2 years (crude incidence 2%). Eleven type I gastric carcinoids were detected at a median follow up of 5.1 years (crude incidence of 5.5%). In seven patients, six low-grade and one high-grade dysplasia were found. The annual incidence rate person-year were 0.25% (95% confidence interval [CI]: 0.067-0.63%), 0.43% (95% CI: 0.17-0.89%), and 0.68% (95% CI: 0.34-1.21%) for gastric cancer, dysplasia, and type I-gastric carcinoids, respectively. The incidence rates of gastric cancer and carcinoids were not different (p = 0.07). Conclusion. This study shows an annual incidence rate of 1.36% person-year for gastric neoplastic lesions in AG patients at long-term follow up. AG patients are similarly exposed to gastric cancer and type I gastric carcinoids

The Role of 3PL Internet Technology in Supporting Extended Enterprise Integration: an Exploratory Survey

Information and Communications Technology (ICT) is widely regarded as a key integration enabler in contemporary supply chain configurations. Additionally, as increasing numbers of manufacturers and retailers outsource significant parts of their supply chain functionality, the world has seen the vertical disintegration of supply chains. As a result of these and other developments, the extended enterprise (EE) business model has become more widely adopted in a range of sectors. In this environment, third party logistics (3PL) providers (the majority of which are small companies) may play a pivotal role in integrating physical and information flows in new business models through the use of ICT, namely through Internet websites. This paper presents the results of an exploratory, empirical investigation conducted on the website content of a sample of 153 small Italian logistics service companies. The results of the survey show managerial implications for small 3PL companies and indicates possible future research directions in this field. This is especially important considering the paucity of research in the field of small 3PLs and little empirical investigation into the use of websites by such firms

Preface

The purpose of this chapter is to identify the necessary components of intelligent Freight Transportation System (IFTS) and analyze the potential effects on transport operations performances in all the three pillars of sustainability, namely the economics, environmental and social impacts. In order to achievethis objective, a literature study was conducted, looking for relevant up-to-date literature within the fields of transportation, logistics, and information and communication technology (ICT) and environmental impacts of freight transportation. In addition, two separate rounds of empirical studies weremade. From literature, as well as from part of the empirical data collection, a requirement analysis was done to understand issues and problems in transport operations that can be addressed with more sophisticated information and communication systems. The second round of empirical data collection wasdone to identify potential solutions of the identified issues. Finally an analysis was made to understand the functionalities of possible IFTS solutions. Many effects were found that can contribute to increased performance of transport operations including automatic item identification, safety and security prevention, real-time navigation, traffic situation notification and carbon footprint registration

The Role of 3PLs Internet Technology in Supporting Extended Enterprise: an Exploratory Survey

It is well accepted that ICT and Internet technology have the potential to facilitate firms’ innovation processes as it offers new and more effective support to conduct business operations. This is particularly true in the context of Extended Enterprise (EE) concept where new technologies are critical in ensuring the effective integration of physical and information flows among participating companies (Dresner et al., 1999). The role of third party logistics providers (3PLs) in logistics outsourcing has evolved along the last few years (McKinnon, 1999). Such companies are transforming their business configuration from simple transport service providers to supply chain integrators. Internet technology (e.g. website) may play an important role in this process as it allows managing information exchange with customer and other supply chain partners more effectively (Evangelista, 2007). Despite this, there is research which indicates that logistics service companies have 2 Capitolo secondo not placed enough importance on the use of websites (Ellinger, et al., 2003; Lynagh, et al. 2001). This paper presents the result of an empirical investigation conducted on the website content of a sample of 153 small Italian logistics service companies. The main aim of the survey is to provide a fresh picture about company website. In particular, it is aimed at assessing the role of 3PLs website in supporting new firms organisational configurations (e.g. EE). The analysis is carried out using a 3PLs taxonomy that distinguishes companies on the basis of the breath of service provided combined with a well recognised model of Internet adoption in the logistics service sector (. The results of the survey allow managerial implications for small 3PLs companies to be drawn and future research directions in this field to be identified

Supply Chain Innovation for Competing in Highly Dynamic Markets: Challenges and Solutions: Preface

This book investigates the role of innovation in the management of supply chains of today, focusing on supply chain integration from both strategic and operational perspectives and the impact of information-related innovation in supply chain and logistics service industries

A novel broadband forcecardiography sensor for simultaneous monitoring of respiration, infrasonic cardiac vibrations and heart sounds

The precordial mechanical vibrations generated by cardiac contractions have a rich frequency spectrum. While the lowest frequencies can be palpated, the higher infrasonic frequencies are usually captured by the seismocardiogram (SCG) signal and the audible ones correspond to heart sounds. Forcecardiography (FCG) is a non-invasive technique that measures these vibrations via force sensing resistors (FSR). This study presents a new piezoelectric sensor able to record all heart vibrations simultaneously, as well as a respiration signal. The new sensor was compared to the FSR-based one to assess its suitability for FCG. An electrocardiogram (ECG) lead and a signal from an electro-resistive respiration band (ERB) were synchronously acquired as references on six healthy volunteers (4 males, 2 females) at rest. The raw signals from the piezoelectric and the FSR-based sensors turned out to be very similar. The raw signals were divided into four components: Forcerespirogram (FRG), Low-Frequency FCG (LF-FCG), High- Frequency FCG (HF-FCG) and heart sounds (HS-FCG). A beat-by-beat comparison of FCG and ECG signals was carried out by means of regression, correlation and Bland–Altman analyses, and similarly for respiration signals (FRG and ERB). The results showed that the infrasonic FCG components are strongly related to the cardiac cycle (R2 > 0.999, null bias and Limits of Agreement (LoA) of ± 4.9 ms for HF-FCG; R2 > 0.99, null bias and LoA of ± 26.9 ms for LF-FCG) and the FRG inter-breath intervals are consistent with ERB ones (R2 > 0.99, non-significant bias and LoA of ± 0.46 s). Furthermore, the piezoelectric sensor was tested against an accelerometer and an electronic stethoscope: synchronous acquisitions were performed to quantify the similarity between the signals. ECG-triggered ensemble averages (synchronized with R-peaks) of HF-FCG and SCG showed a correlation greater than 0.81, while those of HS-FCG and PCG scored a correlation greater than 0.85. The piezoelectric sensor demonstrated superior performances as compared to the FSR, providing more accurate, beat-by-beat measurements. This is the first time that a single piezoelectric sensor demonstrated the ability to simultaneously capture respiration, heart sounds, an SCG-like signal (i.e., HF-FCG) and the LF-FCG signal, which may provide information on ventricular emptying and filling events. According to these preliminary results the novel piezoelectric FCG sensor stands as a promising device for accurate, unobtrusive, long-term monitoring of cardiorespiratory functions and paves the way for a wide range of potential applications, both in the research and clinical fields. However, these results should be confirmed by further analyses on a larger cohort of subjects, possibly including also pathological patients

Analisi FEM di un piede piatto

La patologia del piattismo dell’arco plantare comporta una distribuzione non uniforme dei carichi, rispetto ad un piede sano, dando luogo a disallineamenti del bacino e ad atteggiamenti cifotici e/o scoliotici. Il presente lavoro riguarda l’analisi FEM di un piede affetto da tale patologia. Il modello numerico è stato realizzato da TAC, mediante tecniche di Reverse Engineering di segmentazione della densità, definendo geometricamente la struttura ossea e i tessuti morbidi. Successivamente è stata impiegata la modellazione CAD per la defi nizione geometrica delle cartilagini e per un affi namento del modello stesso

Digital Supply Chains: towards a Framework for Software Distribution

This paper assesses the effect of non-physicality of a digital product - software - on SCM practice. A number of in-depth, one-on-one interviews were held in 8 software companies that predominantly supply to enterprise customers on a global scale. The aim was to explore distribution challenges within software supply chains and how companies are addressing these challenges. The research has identified three different classes of software distribution models: One, which tends to rely on traditional physical infrastructures and paradigms, and two others that better exploit the properties of the digital products