Weighted projective lines as fine moduli spaces of quiver representations

We describe weighted projective lines in the sense of Geigle and Lenzing by a moduli problem on the canonical algebra of Ringel. We then go on to study generators of the derived categories of coherent sheaves on the total spaces of their canonical bundles, and show that they are rarely tilting. We also give a moduli construction for these total spaces for weighted projective lines with three orbifold points.Comment: 14 pages. To appear in Communications in Algebr

Adoption Of Green Supply Chain Initiatives By Iso 14001 Certified Manufacturing Firms In Malaysia: Key Drivers, Outcomes, And Moderating Effect Of Relationship Orientation

Isu-isu berkaitan alam sekitar sentiasa dititikberatkan oleh kerajaan, masyarakat dan organisasi perniagaan. Environmental issues constitute continuous concern for governments, societies, and business organizations

Induced Resistance Using Nonpathogenic Fusarium Oxysporum for Biological Control of Banana Fusarium Wilt

Banana (Musa spp. Linn.) is the second most important fruit crops in Malaysia. It is easily attacked by the fungus Fusarium oxysporum Schlect. fsp. cubense (E.F.Smith) Snyder and Hansen (FOC), causing terminal wilt in the field. Chemical and cultural methods were not effective in controlling the disease. Therefore, alternative control measures have to be developed. In recent years, nonpathogenic Fusaria was being considered for plant disease control and could be the most promising approach for biological control of Fusarium wilt in banana through induced systemic resistance. Isolates of nonpathogenic F oxysporum (FO: F01, F02, F03, F04, F05 and F06) were isolated from healthy roots and rhizospheres of bananas vars. Berangan and Rastali, and were identified to the species level based on cultural and morphological characteristics. Random amplified polymorphic (RAPD-PCR) analysis was able to establish variability within F. oxy.\porom isolates and between saprophytic and pathogenic fonns (FOe race 1 and race 4), using ope 11 and ope 14 primers. All 6 isolates of FO were antagonistic to both pathogenic race 1 and race 4 of FOe with values of the % of inhibition of radial growth (PIRG) exceeding 50% in a series of dual culture test. F04 was found to be the most antagonistic against FOC' race 4 with PIRGof65%. Infectivity studies on six-weeks-old tissue cultured banana seedlings var. Berangan cv. intan, con finned that FO1, F02, F03, F04, F05 or F06 were not pathogenic to banana seedlings. No visible foliar or internal symptoms were observed both on inoculated and control seedlings. Seedlings inoculated with FOC' race 4 produced foliar symptoms as yellowing of the older leaves followed by necrosis and wilting. F04 conferred some degree of resistance to the host when challenged with FOe race I suggesting the possible role of induced resistance against Fusarium wilt

On existence and uniqueness of generalized solutions for a mixed-type differential equation.

In this paper, we study a boundary value problem for a mixed–type differential equation. The existence and uniqueness of generalized solution is proved. The proof is based on an energy inequality and the density of the range of the operator generated by this problem

Performance Evaluation Of Qos In Wimax Network

OPNET Modeler is used to simulate the architecture and to calculate the performance criteria (i.e. throughput, delay and data dropped) that slightly concerned in network estimation. It is concluded that our models shorten the time quite a bit for obtaining the performance measures of an end-to-end delay as well as throughput can be used as an effective tool for this purpose

The effects of heat input and mechanical constraints on the MAG and laser weldability of 316L stainless steel

Stainless steel is the dominant material in many industries such as petrochemicals, paper and pulp, cutlery and food processing units, in addition to offshore and corrosive environment applications. While welding represents the essential joining method for metals under demanding conditions, weldability of austenitic stainless steel must be guaranteed. High coefficient of thermal expansion remains a welding challenge for austenitic stainless steel. Whereas, it promotes the occurrence of the distortion in the welded structures. In this study, angular and longitudinal distortion on thin plates of austenitic stainless steel have been investigated. Ten samples of 316L stainless steel with 3 mm thickness were welded in butt-square joints using MAG and fiber laser welding processes. Therefore, angular and longitudinal distortions were measured by laser- 2D highly sensitive device, and then optical micrograph used to reveal the microstructure and carbides precipitation. Fibre laser welding has produced smaller fusion zone and smaller heat affected zone (HAZ) compared to MAG welding. Therefore, relatively smaller distortion has been generated for the laser-welded samples. Laser welding speed of 2.2 m/min, the power of 2.5KW, and the focal position of 3mm represent the optimum parameters to prevent distortion in the 3mm plate of 316L stainless steel. In MAG welding, test results revealed a proportional relation between welding heat input (KJ/mm) and angular distortion. Raising the heat input from 0.3 to 0.472 KJ/mm increases the angle of distortion four times and increases the bending on the welded plate three times from 1.2 mm to 3.6mm. Constraints, which applied in form of a mechanical clamp does not prevent the occurrence of distortion. 316L showed Ferrite-Austenite solidification mode and an insignificant tendency to hot cracking due to moderate content of ferrite structure estimated as 10% of the total structure. SEM micrography beside the EDS test revealed a proportionality between heat input and carbides formations on the grain boundaries of HAZ, which indicates that degree of sensitization (DOS) to intergranular corrosion is higher when heat input increases and welding speed decreases. FE model has built with ANSYS to simulate the experiment and verify the model based on experimental results, the simulation model showed a significant deviation in the distortion results. Disability of the FE software to introduce the completely welding parameters justifies the variation between numerical and experimental results

IoT-HASS: A Framework For Protecting Smart Home Environment

While many solutions have been proposed for smart home security, the problem that no single solution fully protects the smart home environment still exists. In this research we propose a security framework to protect the smart home environment. The proposed framework includes three engines that complement each other to protect the smart home IoT devices. The first engine is an IDS/IPS module that monitors all traffic in the home network and then detects, alerts users, and/or blocks packets using anomaly-based detection. The second engine works as a device management module that scans and verifies IoT devices in the home network, allowing the user to flag any suspect device. The third engine works as a privacy monitoring module that monitors and detects information transmitted in plaintext and alerts the user if such information is detected. We call the proposed system IoT-Home Advanced Security System or IoT-HASS for short. IoT-HASS was developed using Python 3 and can be implemented in two modes of operation. The in-line mode allows the IoT-HASS to be installed in-line with the traffic inside a Raspberry Pi or a Router. In the in-line mode IoT-HASS acts as an IPS that can detect and block threats as well as alert the user. The second mode is the passive mode where IoT-HASS in not installed in-line with the traffic and can act as an IDS that passively monitors the traffic, detecting threats and alerting the user, but not blocking the attack. IoT-HASS was evaluated via four testing scenarios. It demonstrated superior performance in all testing scenarios in detecting attacks such as DDoS attacks, Brute Force Attacks, and Cross Site Scripting (XSS) Attacks. In each of the four test scenarios, we also tested the device management functionality, which we found to successfully scan and display IoT devices for the homeowner. The extensive evaluating and testing of IoT-HASS showed that IoT-HASS can successfully run in a small device such as a Raspberry Pi, and thus, it will most likely run in an embedded device as an IoT device. Our future research will concentrate on strengthening the current features of IoT-HASS to include additional functionalities