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A novel method for gamma spectrum analysis of low-level and intermediate-level radioactive waste

Nuclear Science and Techniques 2023年第6期34卷 199-213页

作者： Hui Yang Xin-Yu Zhang Wei-Guo Gu Bing Dong Xue-zhi jiang Wen-Tao Zhou De-Zhong Wang School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China

The uncertainty of nuclide libraries in the analysis of the gamma spectra of low-and intermediate-level radioactive waste(LILW)using existing methods produces unstable *** address this problem,a novel spectral analysis method is proposed in this *** this method,overlapping peaks are located using a continuous wavelet *** improved quadratic convolution method is proposed to calculate the widths of the peaks and establish a fourth-order filter model to estimate the Compton edge baseline with the overlapping *** with the adaptive sensitive nonlinear iterative peak,this method can effectively subtracts the ***,a function describing the peak shape as a filter is used to deconvolve the energy spectrum to achieve accurate qualitative and quantitative analyses of the nuclide without the aid of a nuclide *** spectrum acquisition experiments for standard point sources of Cs-137 and Eu-152,a segmented gamma scanning experiment for a 200 L standard drum,and a Monte Carlo simulation experiment for triple overlapping peaks using the closest energy of three typical LILW nuclides(Sb-125,Sb-124,and Cs-134)are *** results of the experiments indicate that(1)the novel method and gamma vision(GV)with an accurate nuclide library have the same spectral analysis capability,and the peak area calculation error is less than 4%;(2)compared with the GV,the analysis results of the novel method are more stable;(3)the novel method can be applied to the activity measurement of LILW,and the error of the activity reconstruction at the equivalent radius is 2.4%;and(4)The proposed novel method can quantitatively analyze all nuclides in LILW without a nuclide *** novel method can improve the accuracy and precision of LILW measurements,provide key technical support for the reasonable disposal of LILW,and ensure the safety of humans and the environment.

关键词： HPGe detector Low-level and intermediate-level radioactive waste Gamma spectrum analysis method Deconvolution method Continuous wavelet transform

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Efficient polymer-mediated delivery system for thiocyclam: Nanometerization remarkably improves the bioactivity toward green peach aphids

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Insect Science 2023年第1期30卷 2-14页

作者： Ye Wang Yong-Hui Xie Qin-Hong jiang Hong-Tao Chen Rui-Hao Ma zhi-jiang Wang Mei-ZhenYin Jie Shen Shuo Yan Department of Plant Biosecurity and MOA Key Lab of Pest Monitoring and Green Management College of Plant ProtectionChina Agricultural UniversityBejingChina Kunming Branch of Yunnan Provincial Tobacco Company KunmingChina State Key Lab of Chemical Resource Engineering Bejing Labof Biomedical MaterialsBejing Universityof Chemical TechnologyBejingChina

The unscientific application of synthetic pesticides has brought various negative effects on the environment,hindering the sustainable development of *** can be applied as carriers to improve pesticide delivery,showing great potential in the development of pesticide formulation in recent ***,a star polymer(SPc)was constructed as an efficient pesticide nanocarrier/adjuvant that could spontaneously assemble with thiocyclam or monosultap into a complex,through hydrophobic association and hydrogen bonding,respectively,with the pesticide-loading contents of 42.54%and 19.3%.This complexation reduced the particle sizes of thiocyclam from 543.54 to 52.74 nm for pure thiocyclam,and 3814.16 to 1185.89 nm for commercial preparation(cp)of ***,the introduction of SPc decreased the contact angles of both pure and cp thiocyclam on plant leaves,and increased the plant uptake of cp thiocyclam to 2.4–1.9 times of that without ***,the SPc could promote the bioactivity of pure/cp thiocyclam against green peach aphids through leaf dipping method and root *** leaf dipping method,the 50%lethal concentration decreased from 0.532 to 0.221 g/L after the complexation of pure thiocyclam with SPc,and that decreased from 0.390 to 0.251 g/L for cp *** seems a promising adjuvant for nanometerization of both pure and cp insecticides,which is beneficial for improving the delivery efficiency and utilization rate of pesticides.

关键词： adjuvant improved bioactivity pesticide nanocarrier pesticide nanometerization pesticide reduction

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Experimental investigation of an adjustable ejector for CO_2 heat pump water heaters

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第11期10卷 1678-1682页

作者： Guang-ming CHEN Li-xia LIANG Li-ming TANG Xiao-xiao XU zhi-jiang ZHU Qi CHEN State Key Laboratory of Clean Energy Utilization Institute of Refrigeration and Cryogenics Zhejiang University Hangzhou 310027 China

An adjustable ejector expansion device for a CO2 heat pump water heater (HPWP) is proposed to improve the system performance. It has been designed to investigate experimentally the effects of the motive nozzle throat area of the ejector, entrained flow pressure, back pressure and primary flow pressure on the entrainment ratio. Experiments based on different motive nozzle throat areas were conducted and the results of the prototype ejector using CO2 as working fluid are presented. The results show that an adjustable ejector can achieve high performance and work well in a wide range of working conditions.

关键词： Adjustable elector System nerformance CO2 heat oumo water heater (HPWH) Entrainment ratio

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Optimal design of dynamic and control performance for planar manipulator

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Journal of Central South University 2012年第1期19卷 108-116页

作者： YOU Wei KONG Min-xiu SUN Li-ning DU zhi-jiang State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

A design and optimization approach of dynamic and control performance for a two-DOF planar manipulator was *** the kinematic and dynamic analysis,several advantages of the mechanism were illustrated,which made it possible to obtain good dynamic and control performances just through mechanism *** on the idea of design for control(DFC),a novel kind of multi-objective optimization model was *** were three optimization objectives:the index of inertia,the index describing the dynamic coupling effects and the global condition *** indexes to characterize the designing requirements such as the velocity of end-effector,the workspace size,and the first mode natural frequency were regarded as the *** cross-section area and length of the linkages were chosen as the design ***-II algorithm was introduced to solve this complex multi-objective optimization *** criteria from engineering experience were incorporated into the selecting of final parameters among the obtained Pareto solution ***,experiments were performed to validate the linear dynamic structure and control performances of the optimized mechanisms.A new expression for measuring the dynamic coupling degree with clear physical meaning was *** results show that the optimized mechanism has an approximate decoupled dynamics structure,and each active joint can be regarded as a linear SISO *** control performances of the linear and nonlinear controllers were also *** can be concluded that the optimized mechanism can achieve good control performance only using a linear controller.

关键词： mechanism optimization dynamic optimization design for control multi-objective optimization

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First total synthesis of (±)-puyanin and (±)-4'-O-methylbonannione

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Chinese Chemical Letters 2010年第11期21卷 1267-1269页

作者： Jin Hui Yang Yu Heng Zhang Hong Jun Li Shi zhi jiang Yun Feng Li Key Laboratory of Energy Sources and Chemical Engineering of Ningxia Ningxia University Yinchuan 750021 China

A facile approach for the first total synthesis of two naturally occurring geranylated flavonoids,（±）-puyanin 1 and（±）-4＇-O- methylbonannione 2 has been obtained with total yield 27%and 21%,*** key steps were regioselective cyclization of geranylated trihydroxychalcone and regioselective geranylation of 2,4,6-trihydroxyacetophenone.

关键词： Puyanin 4'-O-Methylbonannione Flavanone Geranylated flavonoids Total synthesis

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First total synthesis of ocimarin

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Chinese Chemical Letters 2010年第10期21卷 1165-1166页

作者： Jin Hui Yang Yun Feng Li Cong Bin Ji Shi zhi jiang Wan Yi Liu Key Laboratory of Energy Sources & Engineering Ningxia University Yinchuan 750021 China School of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021 China

A facile approach for the first synthesis of ocimarin, naturally occurring coumarins, was developed by employing a cerium （III） chloride heptahydrate-catalyzed Pechmann condensation of phenols and β-keto esters in a solvent-free system as key step, by which ocimarin was achieved by three steps starting from acetylacetic ether and resorcinol with total yield 23.2%. All structures of new compounds were confirmed by IR, ^1H NMR and MS.

关键词： Coumarins Ocimarin CeCl3.7H2O Total synthesis

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Neuronal intranuclear inclusion disease mimicking acute cerebellitis:A case report

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World Journal of Clinical Cases 2020年第23期8卷 6122-6129页

作者： Jiao-Jiao Guo Zi-Yi Wang Meng Wang Zong-zhi jiang Xue-Fan Yu Department of Neurology and Neuroscience Center The First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina

BACKGROUND Neuronal intranuclear inclusion disease(NIID)is an unusual autosomal dominant,chronic progressive neurodegenerative *** clinical manifestations of NIID are complex and varied,complicating its clinical *** the best of our knowledge,this report is the first to document sporadic adult-onset NIID mimicking acute cerebellitis(AC)that was finally diagnosed by imaging studies,skin biopsy,and genetic *** SUMMARY A 63-year-old man presented with fever,gait unsteadiness,dysarthria,and an episode of *** serum levels of white blood cells and C-reactive protein were significantly elevated.T2-weighted brain magnetic resonance imaging and fluid attenuation inversion recovery sequences showed bilateral high-intensity signals in the medial part of the cerebellar hemisphere beside the *** we initially considered a diagnosis of AC,the patient’s symptoms improved significantly without special treatment,prompting our consideration of ***-weighted imaging showed hyperintensity in the corticomedullary *** biopsy revealed eosinophilic inclusions positive for anti-p62 in epithelial sweat-gland *** repeat expansions in the Notch 2 N-terminal like C gene confirmed the diagnosis of *** For patients with clinical manifestations mimicking AC,the possibility of underlying NIID should be considered along with prompt rigorous examinations.

关键词： Neuronal intranuclear inclusion disease Acute cerebellitis Skin biopsy Genetic testing Magnetic resonance imaging Case report

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Changes in intestinal microflora in rats with acute respiratory distress syndrome

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World Journal of Gastroenterology 2014年第19期20卷 5849-5858页

作者： Yan Li Xiang-Yong Liu Ming-Ming Ma zhi-jiang Qi Xiao-Qiang Zhang zhi Li Guo-Hong Cao Jun Li Wei-Wei Zhu Xiao-zhi Wang Department of Respiratory Medicine and Intensive Care Unit Affiliated Hospital of Binzhou Medical University Department of Intensive Care Unit Zhangqiu People’s Hospital Department of Cell Biology Binzhou Medical University Department of Intensive Care Unit Dezhou People’s Hospital

AIM: To implement high-throughput 16S rDNA sequencing to study microbial diversity in the fecal matter of rats with acute lung injury/acute respiratory distress syndrome (ALI/ARDS).

关键词： Lipopolysaccharide Acute lung injury Acute respiratory distress syndrome Intestinal microflora High-throughput sequencing

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Increased leptin by hypoxic-preconditioning promotes autophagy of mesenchymal stem cells and protects them from apoptosis

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Science China(Life Sciences) 2014年第2期57卷 171-180页

作者： WANG LiHan HU XinYang ZHU Wei jiang zhi ZHOU Yu CHEN PanPan WANG JianAn Cardiovascular Key Lab of Zhejiang Province the Second Affiliated Hospital School of Medicine Zhejiang University

Autophagy is the basic catabolic progress involved in cell degradation of unnecessary or dysfunctional cellular *** has been proven that autophagy could be utilized for cell survival under ***-preconditioning(HPC)could reduce apoptosis induced by ischemia and hypoxia/serum deprivation(H/SD)in bone marrow-derived mesenchymal stem cells(BMSCs).Previous studies have shown that both leptin signaling and autophagy activation were involved in the protection against apoptosis induced by various stress,including ***,it has never been fully understood how leptin was involved in the protective effects conferred by *** the present study,we demonstrated that HPC can induce autophagy in BMSCs by increased LC3-II/LC3-I ratio and autophagosome ***,similar effects were also observed when BMSCs were pretreated with *** beneficial effects offered by HPC were absent when BMSCs were incubated with autophagy inhibitor,3-methyladenine(3-MA).In addition,down-regulated leptin expression by leptin-shRNA also attenuated HPC-induced autophagy in BMSCs,which in turn was associated with increased apoptosis after exposed to sustained H/***,increased AMP-activated protein kinase phosphorylation and decreased mammalian target of rapamycin phosphorylation that were observed in HPC-treated BMSCs can also be attenuated by down-regulation of leptin *** data suggests that leptin has impact on HPC-induced autophagy in BMSCs which confers protection against apoptosis under H/SD,possibly through modulating both AMPK and mTOR pathway.

关键词： BMSCs autophagy hypoxic-preconditioning leptin apoptosis

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Transesterified Chinese Spicehush (Lindera communis) seed oil as a biodiesel fuel

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Forestry Studies in China 2007年第2期9卷 132-136页

作者： Wang Wei-gang Ma Lei jiang Jian-xin jiang Li Zhang zhi-xiang College of Materials Science and Technology Beijing Forestry University Beijing 100083 P. R. China

Studies were carried out on the transesterification of the Chinese Spicehush （Lindera communis） seed （LCS） oil with methanol for the production of biodiesel. The methyl esters of LCS oil were compared with soybean esters to determine biodiesel fuel performance and properties. The fatty acids content in the seed kernel oil （LKO） and coat oil （LCO） were quantified by gas chromatography and mass spectrometry method （C-C-MS）. LKO contains 95.1% saturated acids （capric, lauric, myristic and palmitic） and 2.3% unsaturated acids （oleic）. LCO contains 24.6% saturated acids （palmitic and stearic） and 73.6% unsaturated acids （oleic, linoleic and palmitoleic）. The kinematic viscosity, cold filter plugging point, cloud point, flash point and cetane index were determined. The methyl esters of LKO had a higher kinematic viscosity and a lower cold filter plugging point value, so it has better performance in cold weather. The biodiesel of LCS oil has fuel properties within the limits prescribed by American （ASTM D 6751-02） standards, except for a slightly lower flash point of LKO biodiesel than that prescribed by these standards （130℃）. Thus, LKO and LCO biodiesel have great potential to be used on a large scale as fuel for diesel engines.

关键词： biodiesel Lindera communis oil transesterification property

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