Research on the Investment Mode and Path of China’s Construction Waste Resourceization Industry

At present,China’s construction waste accounts for about 40%of the total municipal solid waste,with a large stock,a large increment,and a low rate of resource utilization,which is still a big gap compared with developed countries.However,the market prospect of the construction waste industry is relatively broad,the reuse value of the construction waste is high,so these resources should be fully utilized.This paper presents an in-depth analysis of projects in the construction waste resourceization industry,examining the industrial chain,development history,current status,investment and financing modes,and case studies.It proposes targeted strategies for companies to focus on the upstream and downstream segments of the construction industry’s value chain and explores the implementation of investment opportunities in construction waste resourceization.

High sensitivity dual core photonic crystal fiber sensor for simultaneous detection of two samples

The optical control ability of photonic crystal fiber(PCF)is a distinctive property suitable for improving sensing and plasma performance.This article proposes a dual-core D-channel PCF sensor that can detect two samples simultaneously,which effectively solves the problems of coating difficulty and low wavelength sensitivity.The PCF has four layers of air holes,which dramatically reduces the optical fiber loss and is more conducive to the application of sensors in actual production.In addition,by introducing dual cores on the upper and lower sides of the central air hole,reducing the spacing between the core and the gold nanolayer,a stronger evanescent field can be generated in the cladding air hole.The optical fiber sensor can detect the refractive index of two samples simultaneously with a maximum sensitivity of 21300 nm/RIU.To the best of our knowledge,the sensitivity achieved in this work is the highest sensitivity with the dual sample synchronous detection sensors.The detection range of the refraction index is 1.35-1.41,and the resolution of the sensor is 4.695×10^(-6).Overall,the sensor will be suitable for medical detection,organic chemical sensing,analyte detection,and other fields.

Outcomes and risk factors for failure of trabeculectomy in glaucomatous patients in Southwest China:a 325 eyes analysis

AIM:To evaluate the outcomes and elucidate the failure factors for trabeculectomy with mitomycin C(MMC)in Southwest Chinese patients.METHODS:A retrospective correlational study was conducted on the glaucomatous patients who underwent initial trabeculectomy with MMC in Southwest Hospital and had been followed up for 1-3y.A complete success for surgery is defined as a postoperative intraocular pressure(IOP)>5 and≤21 mm Hg and 20%reduction of IOP compared to preoperative,without IOP-lowering medications.A qualified success for surgery is defined as the abovementioned postoperative IOP with or without IOP-lowering medications.The primary outcomes were IOP,the number of IOP-lowering medications,and cumulative success rate.The secondary outcomes included best corrected visual acuity(BCVA),mean deviation(MD)of visual field,major complications,and risk factors for surgical failure.RESULTS:A total of 325 eyes of 261 glaucomatous patients had been included in our study.Both the mean IOP and the number of IOP-lowering medications were significantly decreased from 32.9±12.0 to 16.4±5.7 mm Hg(P<0.0001)and 3.0±0.9 to 0.9±1.0(P<0.0001),respectively,at the last visit.The cumulative complete success rate and qualified success rate were 77.8%and 92.0%at 1-year follow-up,and 47.2%and 77.7%at 3-year follow up.There were no significant differences in surgical outcomes between primary angle-closure glaucoma(PACG)and primary open angle glaucoma(POAG).In PACG patients,the success rates of trabeculectomy were comparable with those of phacotrabeculectomy.Hypertension(HR=1.904,P=0.011),encapsulated bleb(HR=2.756,P<0.001),and more preoperative topical medications(HR=2.475,P=0.008)were risk factors for surgical failure.CONCLUSION:The qualified success rate of trabeculectomy with MMC in glaucomatous patients in the cohort is 92.0%at 1-year,and 77.7%at 3-year follow up.Hypertension,encapsulated bleb,and more preoperative topical medications are associated with surgical failure.

Fourier-domain optical coherence tomography-guided phototherapeutic keratectomy for the treatment of anterior corneal scarring

AIM:To evaluate the safety,visual and anatomic outcomes of fourier-domain optical coherence tomography(FD-OCT)-guided excimer laser phototherapeutic keratectomy(PTK)combined with photorefractive keratectomy(PRK)surgery in treating anterior corneal scarring.METHODS:Clinical data of 23 eyes of 21 patients with anterior corneal scarring underwent FD-OCT-guided PTK and PRK from Dec.2014 to Jul.2016 were reviewed.Patients were assessed for preoperative and postoperative uncorrected visual acuity(UCVA),best spectacle-corrected visual acuity(BSCVA),contrast sensitivity(CS),FD-OCT,corneal topography and colour figures of anterior segments.RESULTS:The preoperative corneal pathologic conditions included viral keratitis(7 patients,7 eyes),band keratopathy(2 patients,4 eyes),corneal dystrophy(4 patients,4 eyes),traumatic corneal disease(2 patients,2 eyes)and corneal chemical injury(6 patients,6 eyes).Mean follow-up time was 10.65(range,3-19)mo.UCVA(in IogMAR)improved from a mean of 0.79(95%Cl,0.28­1.29)preoperatively to a mean of 0.45(95%Cl,0.29-0.62)postoperatively(P=0.021).BSCVA(in IogMAR)improved from 0.57(95%Cl,0.27-0.88)preoperatively to a mean of 0.28(95%Cl,0.15-0.41)postoperatively(P=0.001).Corneal topographic indices postoperatively showed significant improvement in corneal cylinder(P=0.009),the surface regularity index(P=0.007)and surface asymmetry index(P=0.00).Postoperative spherical equivalent averaged-0.53 diopters(-1.49 to 0.42).No complications were associated with the treatment.CONCLUSION:FD-OCT-guided PTK combined with PRK is safe and effective for the treatment of anterior corneal scarring by eliminating or reducing corneal opacities.

Creation of multi-frequency terahertz waves by optimized cascaded difference frequency generation

A new scheme which generates multi-frequency terahertz(THz)waves from planar waveguide by the optimized cascaded difference frequency generation(OCDFG)is proposed.A THz wave with frequencyω_(T1)is generated by the OCDFG with two infrared pump waves,and simultaneously a series of cascaded optical waves with a frequency intervalω_(T1)is generated.The THz wave with a frequency of M-timesω_(T1)is generated by mixing the m-th-order and the(m+M)-th-order cascaded optical wave.The phase mismatch distributions of cascaded difference frequency generation(CDFG)are modulated by changing the thickness of planar waveguide step by step,thereby satisfying the phase-matching condition from first-order to high-order cascaded Stokes process step by step.As a result,the intensity of THz wave can be enhanced and modulated by controlling the cascading order of OCDFG.

Theoretical research on terahertz wave generation from planar waveguide by optimized cascaded difference frequency generation

A novel scheme for high-efficiency terahertz(THz)wave generation based on optimized cascaded difference frequency generation(OCDFG)with planar waveguide is presented.The phase mismatches of each-order cascaded difference frequency generation(CDFG)are modulated by changing the thickness of the waveguide,resulting in a decrement of phase mismatches in cascaded Stokes processes and an increment of phase mismatches in cascaded anti-Stokes processes simultaneously.The modulated phase mismatches enhance the cascaded Stokes processes and suppress the cascaded anti-Stokes processes simultaneously,yielding energy conversion efficiencies over 25%from optical wave to THz wave at 100 K.

丹青始终 浅谈圆明三园对江南园林的写仿工程

圆明园在营建过程中存在对江南园林景观进行写仿的现象,其中,绘画作品扮演着重要的角色。乾隆帝在御园中写仿江南园林时,会涉及和创作大量的绘画作品,而这些作品有着启发和引导仿建工程的功能及用途。可以说这些绘画与圆明园的写仿工程相始终……。