Capsule Endoscopy: Strategies and Pitfalls of Interpretation

Jang, Byung-Ik; Graham, David Y.; Lee, SiHyung; Kim, KyeongOk

doi:10.5772/21994

Cited by 4 publications

(9 citation statements)

References 96 publications

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“…Thanks to its unique property, lewis acidic B(C 6 F 5 ) 3 has been widely used as an activator in ethylene polymerization, [58][59][60][61][62][63][64][65] and thus also attractive in norbornene polymerizations. 51,68 Recently, neutral nickel catalysts based on β-ketiminato ligands were reported to be active for norbornene polymerization in the presence of B(C 6 F 5 ) 3 as a singular cocatalyst, however, the amount of B(C 6 F 5 ) 3 required was large. 67 Jang's group also investigated the effect of B(C 6 F 5 ) 3 on the norbornene polymerization, but the Ni(II) complexes combined with B(C 6 F 5 ) 3 alone did not result in any activity regardless of the structures of the complexes.…”

Section: Introductionmentioning

confidence: 99%

“…67 Jang's group also investigated the effect of B(C 6 F 5 ) 3 on the norbornene polymerization, but the Ni(II) complexes combined with B(C 6 F 5 ) 3 alone did not result in any activity regardless of the structures of the complexes. While SHOP type catalysts have been rigorously studied for ethylene oligomerization or polymerization as in situ catalysts, 51,[70][71] well-defined catalysts based on phosphino-phenolate ligands were rarely reported, [72][73][74][75] especially their activity towards norbornene and its derivatives. 4,69 As an ongoing research in our group, we are interested in the property of [P,O] chelate neutral nickel catalysts for the (co)polymerization of norbornene.…”

Section: Introductionmentioning

confidence: 99%

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Well-defined phosphino-phenolate neutral nickel(ii) catalysts for efficient (co)polymerization of norbornene and ethylene

Zhang

et al. 2015

Dalton Trans.

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Phosphino-phenolate neutral nickel catalysts 1-3/B(C6F5)3, without the help of any organoaluminum compound, were found to be efficient catalytic systems for norbornene polymerization and its copolymerization with norbornene derivatives. The amount of B(C6F5)3 required for achieving a high efficiency (3 equiv.) was markedly lower compared to previous reports, and high molecular weight polymers were obtained (>10(6) g mol(-1)). Efficient incorporation of polar monomers NBC, NBA, and NBM was also achieved in a controllable fashion, yielding high molecular weight copolymers. Catalysts 1-3 were highly active for ethylene polymerization as single component catalysts, with an activity of up to 10(7) g molNi(-1) h(-1), and catalyst 3 was more readily initiated at lower temperature. Catalysts 1-3 were also efficient in incorporating norbornene (up to 30%) into the polyethylene backbone. Bisligated phosphino-phenolate nickel complex 4 and salicylaldimine complex 5 were also studied for comparison, which further verified the unique performance of catalysts 1-3. Preliminary NMR analyses were conducted to explore the norbornene polymerization mechanism.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Well-defined phosphino-phenolate neutral nickel(ii) catalysts for efficient (co)polymerization of norbornene and ethylene

Zhang

et al. 2015

Dalton Trans.

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“…d 3 : During the stage of the auxiliary capacitor C 1 and C 2 is charged (or discharged) by primary side current, the secondary side of output voltage remains 4 : primary auxiliary capacitors are charging and discharging completely, the primary side into the freewheeling stage, the load current is supplied by the secondary side of the clamp capacitor C C . 4 3 0 …”

Section: Small Signal Model Of Phase-shift Full-bridge Zvzcs Conmentioning

confidence: 99%

“…The main waveforms for the circuit shown in Fig.3, the effective duty cycle equation is shown in (7): 4 are set up as the length of time t 1 , t 2 , t 3 , t 4 respectively. d 3 : During the stage of the auxiliary capacitor C 1 and C 2 is charged (or discharged) by primary side current, the secondary side of output voltage remains 4 : primary auxiliary capacitors are charging and discharging completely, the primary side into the freewheeling stage, the load current is supplied by the secondary side of the clamp capacitor C C .…”

Section: Small Signal Model Of Phase-shift Full-bridge Zvzcs Conmentioning

confidence: 99%

“…Therefore, the circuit structure was complicated and costly. In recent years, phase-shifted fullbridge ZVS converter was the most commonly circuit topology used in the second converter [4][5]. But it had several disadvantages, such as duty cycle loss and difficulty of achieving ZVS (Zero Voltage Switching) on the lagging leg during light load [6].…”

Section: Introductionmentioning

confidence: 99%

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Design and experimental verification of on-board charger for electric vehicle

Fang

Liu

et al. 2014

2014 International Power Electronics and Application Conference and Exposition

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In this paper, an on-board charger for electric vehicle, with two-stage power converter, is designed. Firstly, a single-phase Boost-APFC (Active Power Factor Correction) circuit controlled by a one-cycle controller is designed as the front state converter. Compared to the traditional APFC circuit, the One-cycle controller is constructed without considering the multiplier and AC line voltage sensing circuits, which is suitable for APFC system. Moreover, the one cycle controlled Boost-APFC converter has strong ability to reject the input voltage disturbance. After that, the second stage converter is an improved phase-shifted full-bridge ZVZCS (Zero Voltage Zero Current Switching) power converter, wherein the secondary side of the auxiliary circuit is consisted of two diodes and a clamp capacitor. The clamp capacitor is charged on transfer mode and discharged on free-wheeling mode. By achieving the ZCS on the lagging leg, the voltage stress on the secondary side of the rectifier bridge is reduced. Based on the effective duty cycle approach of small signal model on Buck converter, a new small signal model has been built, which provides a theoretical basis for closed-loop control circuit analysis and design. Finally, a 1Kw prototype, with 120V (AC) input and 200V output, is built. IR1153S and UCC3895 were used as the control chips, and the switching frequency is 22 kHz. Moreover, the prototype has been achieved a peak efficiency of 92% at a full load.

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Influence of Minimum Tension Steel Reinforcement on the Behavior of Singly Reinforced Concrete Beams in Flexure

Abdulsada

Khalel²,

Sarsam³

2020

ETJ

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The requirements of minimum flexural reinforcement in the last decades have been a reason for controversy. The structural behavior of beams in bending is the best way of investigating and evaluating the minimum reinforcement in flexure. For this purpose, twelve singly reinforced concrete beams with a rectangular cross-section of (125 mm) width by (250 mm) height and (1800 mm) length were cast and tested under two-point loads up to failure. These beams were divided into three groups with different compressive strengths (25, 50, and 80 MPa). Each group consists of four beams with different amounts of tension steel reinforcement approximately equal to (0% Asmin, 50% Asmin, 100% Asmin and 150% Asmin), two bar diameters (Ø6 mm and Ø8 mm) were used as the longitudinal tension reinforcement with different yield and ultimate strengths, the minimum amount of reinforcement required is calculated based on ACI 318M-2014 code. The results show that for the reinforced concrete beams, the flexural reinforcement in NSC beams increases the first cracking load and the increment increased with an increasing amount of reinforcement, while for HSC beams the increasing in first cracking load are very little when the quantity of reinforcement less than the minimum flexural reinforcement and increased with the increasing amount above the minimum flexural reinforcement. The equation of ACI 318M-14 code gives adequate minimum flexural reinforcement for NSC and overestimate value for HSC up to (83 MPa), A new formula is proposed for HSC rectangular beams up to (90 MPa) concrete compressive strength by reducing the equation of ACI 318M-14 code for minimum flexural reinforcement by a factor depending on concrete compressive strength.

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Capsule Endoscopy: Strategies and Pitfalls of Interpretation

Cited by 4 publications

References 96 publications

Well-defined phosphino-phenolate neutral nickel(ii) catalysts for efficient (co)polymerization of norbornene and ethylene

Well-defined phosphino-phenolate neutral nickel(ii) catalysts for efficient (co)polymerization of norbornene and ethylene

Design and experimental verification of on-board charger for electric vehicle

Influence of Minimum Tension Steel Reinforcement on the Behavior of Singly Reinforced Concrete Beams in Flexure

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