Modified Aperture Coupling Annular-Ring Antenna fed by Stripline

Various types of feed structures for microstrip antennas are compared. Broad bandwidth is obtained using aperture coupling with impedance matching. One of advantages in aperture coupling is polarization purity. A modified aperture coupling annular-ring antenna fed by microstrip is presented in this paper. This antenna structure can be considered as the combination of aperture feeding and proximity feeding an annular-ring antenna. It has both advantages in the polarization purity and in reduction of back radiation. From the structure based on the proximity feed annular-ring antenna, an aperture layer is inserted and modified as well as an aperture size to enhance bandwidth

Multi-band Internal Loop Antenna with Inserted Concentric Rings for Mobile Terminals

Loop Antenna with inserted concentric rings is proposed for mobile terminals. Inserting concentric ring(s) on the loop element improves the impedance bandwidth of the proposed antenna. Measurement results show that the bandwidth includes GSM, DCS, PCS, and UMTS bands

The Impact Of Job Demands And Resources On Job Crafting

Organizations are constantly under pressure for survival in the current highly volatile work environment. This change has been accelerated by trends such as smart work environments and artificial intelligence in the organizational context. Given such uncertainty deriving from a fast rate of change and high complexity, it is vital for organizations to fully utilize and support individuals to be fully engaged in their work, setting grounds for transformation and modification of general roles and specific tasks. Based on the job demands-resources model, our hypotheses are tested using empirical data extracted from 172 subjects currently working in organizations. By commissioning a questionnaire survey method and hierarchical regression analysis, the results offer partially strong support for our proposed research model. We attained moderate support for our hypotheses, in that an individuals’ perception of job resources and job demands in the work context induce job crafting (i.e., task, cognitive, and relational), which acts as a critical mechanism arousing individual work engagement and job stress. In general, job resources (i.e., job autonomy and performance feedback) predicted work engagement, while job demands (i.e., work overload, emotional demands, and technology demands) affected job stress. Also, job demands and job resources both influenced task job crafting, while emotional demands were related to cognitive and relational job crafting, implying different paths between demands and resources and various job crafting activities. In addition, three job crafting dimensions affected work engagement, while only relational job crafting positively affected job stress.

Endoscopic treatment for rectal neuroendocrine tumor: which method is better?

Recently, research on rectal neuroendocrine tumors (NETs) has increased during the last few decades. Rectal NETs measuring 10 mm, suctioning is not possible due to fibrosis in the lesion, or when the snaring for modified endoscopic mucosal resection does not work well

Interplay of charge density waves, disorder, and superconductivity in 2H-TaSe2 elucidated by NMR

Single crystals of pristine and 6% Pd-intercalated 2H‐TaSe2 have been studied by means of 77Se nuclear magnetic resonance. The temperature dependence of the 77Se spectrum, with an unexpected line narrowing upon Pd intercalation, unravels the presence of correlated local lattice distortions far above the transition temperature of the charge density wave (CDW) order, thereby supporting a strong-coupling CDW mechanism in 2H‐TaSe2. While, the Knight shift data suggest that the incommensurate CDW transition involves a partial Fermi surface gap opening. As for spin dynamics, the 77Se spin-lattice relaxation rate T1-1 as a function of temperature shows that a pseudogap behavior dominates the low-energy spin excitations even within the CDW phase, and gets stronger along with superconductivity in the Pd-6% sample. We discuss that CDW fluctuations may be responsible for the pseudogap as well as superconductivity, although the two phenomena are unlikely to be directly linked each other

Multiple extraintestinal manifestations in a patient with acute severe ulcerative colitis: a case report

Patients with inflammatory bowel disease (IBD) are at risk for extraintestinal manifestations (EIM) over the course of their disease. As EIMs can involve nearly every organ, and strongly influence the quality of life, early recognition and adequate treatment are necessary to prevent severe morbidity and mortality in affected patients. Pyoderma gangrenosum is a highly severe and debilitating skin condition that occurs in 1% to 10% of ulcerative colitis (UC) patients. Thromboembolic events are also serious EIMs and usually present as deep vein thromboses in the legs or as pulmonary embolisms. A 19-year-old woman presented with bloody diarrhea lasting for 3 months and deep ulceration on the right foot. She was diagnosed with UC. The patient's skin lesions did not improve with intravenous corticosteroids and oral mesalazine. After she was started on infliximab, we observed rapid resolution of the skin lesions. She continued to complain of mild dyspnea while in the hospital. Computed tomography performed using the thromboembolism protocol revealed pulmonary thromboembolism and deep venous thrombosis. The patient underwent anticoagulant therapy with low-molecular-weight heparin, and her dyspnea gradually improved. Anticoagulation was continued with warfarin. It is rare for IBD patients to have multiple EIMs; however, this case demonstrates that multiple EIMs are a possible presentation in UC and underscores the importance of a meticulous clinical examination and adequate evaluation in the management of IBD patients presenting with EIMs

MOMENT RESISTANCE PERFORMANCE OF LARCH LAMINATED TIMBER BEAM-COLUMN JOINTS REINFORCED WITH CFRP

This study evaluates the moment resisting capacity of the drift pin larch beam-column joint with slotted-in steel plates of larch laminated timber. It is reinforced with carbon fiber reinforced plastic (CFRP) to suppress the brittle fracture of the beam-column joint and improve the joint capacity using larch laminated timber, a wood material manufactured by multi-layering of timber as a structural member of heavy timber.The average maximum moment capacity of the control specimen was 16.9 kN·m and the average maximum moments of the Type-A (volume ratio of joint reinforced with CFRP: 3.6%) and Type-B (volume ratio of joint reinforced with CFRP: 5.4%) were increased by 46% and 62%, respectively, compared to that of the control specimen. The capacity of the joint, such as the average yield capacity, ultimate moment capacity, and ductility ratio, of the control, Type-A, and Type-B specimens increased as the reinforcement ratio of the CFRP increased. For the failure mode of the control specimen, splitting failure occurred in both the column and beam members in the end distance direction. However, the splitting failure did not occur in the beam member due to the improvement of the joint and ductility of the specimens reinforced with the CFRP. The Type-A specimen had improved joint capacity and ductility compared to the control specimen; however, brittle failure occurred owing to the external force exceeding the joint capacity. However, in some of the Type-B specimens, the splitting failure did not occur in the column and beam members due to the CFRP reinforcement. Particularly, the Type-B3 specimen exhibited ductility

Electrical Loop for 433.92MHz Reader Antenna of RFID Systems

A reader antenna for active RFID technology at 433.92MHz, used for cargo container security, is proposed. The proposed antenna consists of two layer radiating elements excited by a single probe simultaneously. An omnidirectional radiation pattern with φ-component of electric field is obtained by an electrical loop with uniform and in-phase current as the radiating source. Measured peak gain is 2.9dBi, and the average gain is 0.92dBi in x-y plane