Search

Three experiments based on the nuclear reactions 14N + 110Pd, 10B + 114Cd and 11B + 114Cd were performed. Coincidences between γ-rays emitted from these reactions were measured with the same detection array which consisted of 14 HPGe detectors. A new band structure was identified using an offline analysis of coincidence data. Because of the isomeric nature of the bandhead, the new band cannot be connected to any known state in any residual nuclei of the used reactions. To assign it to a specific nucleus, we evaluated the experimental population intensities of various known bands in known residual nuclei and investigated the entrance channel effects in the three different experiments. The population intensity patterns of the known bands were observed to exhibit regular systematics. Based on such experimental systematics, we suggest that the most reasonable nuclide assignment for the new band is the 120I nucleus.

Large areas of $$^{3}$$ He neutron detector array and corresponding readout electronics are used in the MPI built at China Spallation Neutron Source (CSNS) to measure the position and flight time of scattered neutrons, and MPI has a high requirement for the position resolution of $$^{3}$$ He neutron detector. A $$^{3}$$ He neutron detector readout electronics prototype composed of two front-end boards and one digital readout board is designed to meet the above requirements. Testing the whole readout electronics system before its mass production to ensure it can run correctly and fulfill the functional and performance requirements. The test of the readout electronics prototype is implemented in the laboratory, and a signal generator is used to generate electronic signals instead of actual neutron signals. The position resolution test of the readout electronics prototype with $$^{3}$$ He tubes is carried out in the No. 20 beamline measurement room of CSNS. The functional and performance tests in the laboratory state that the readout electronics prototype can fulfill the readout requirements. The typical value of charge resolution is 0.85 fC; the integral nonlinearity of charge is 0.094 $$\%$$ in the input charge range from 100 to 800 fC. The position resolution test result of the prototype with $$^{3}$$ He tubes is better than the design requirement of 10 mm and also quite good compared with that of some other commercial products. These tests provide a reliable basis for the mass production of the readout electronics prototype.

Aim: It has been reported that glial cells are involved in Alzheimer’s disease (AD). According to our previous research, Scutellaria barbata flavonoids (SBFs) can protect the neuronal disorder and memory impairment for AD-like rats, while the effect of SBFs on the glial cells disorder in AD-like rats has been less well studied. The effects of SBFs on astrocytes(ASs), microglial cells (MGs) and oligodendrocytes (Ols), as well as heat shock proteins 70 (Hsp70) and apolipoprotein E (ApoE) were investigated in the present study. Methods: The successful model rats, screened by Morris water maze, were daily orally administrated with 35, 70 and 140 mg/kg SBFs for 36 d. The numbers of brain’s astrocytes (ASs), microglial cells (MGs) and oligodendrocytes (Ols) were examined by immunohistochemistry. The cortical glial fibrillary acidic protein (GFAP), leukocyte common antigen (LCA) (CD45), Claudin 11 and heat shock proteins 70 (Hsp70) protein expression were assayed by Western blotting, and apolipoprotein E (ApoE) mRNA expression was analyzed by real-time quantitative polymerase chain reaction (qPCR). Results: Compared with the sham-operated group, the number of ASs and MGs in the brain was significantly increased in the model group (P Conclusions: SBFs can dramatically improve the abnormal changes in glial cells of the brains of rats, induced by composited Aβ, which may be utilized as a helpful treatment for neurodegenerative diseases.

Excited states of 113In have been populated through the heavy-ion fusion evaporation reaction 110Pd(7Li, 4n)113In. A new band with the configuration of a proton d5/2 orbital is identified. Two ΔI = 2 intruder bands, built on the πh11/2 and the πg7/2 orbitals, have been extended to spins (63/2−ħ and (55/2+)ħ, respectively. The negative-parity πh11/2 intruder band shows a smooth increase in aligned spin, which is attributed to a strong proton-neutron interaction. The properties of the positive-parity πg7/2 band are discussed based on tilted axis cranking model calculations, and the features of the antimagnetic rotation for this band are shown after backbend. Furthermore, the contributions of the two-shears-like mechanism, the neutron (gd)ν shell and the core rotation are investigated for the positive-parity πg7/2 band.

BACKGROUND Increased homocysteine levels are associated with the risk of cardiovascular disease (CVD) and death. However, their prevention has not been effective in decreasing CVD risk. This study investigated the individual and combined associations of hyperhomocysteinemia and hypertension with incident CVD events and all-cause death in the Chinese elderly population without a history of CVD. METHODS This prospective study was conducted among 1,257 elderly participants (mean age: 69 years). A questionnaire survey, physical examinations, and laboratory tests were conducted to collect baseline data. Hyperhomocysteinemia was defined as homocysteine level ≥ 15 µmol/L. H-type hypertension was defined as concomitant hypertension and hyperhomocysteinemia. Multivariate Cox regression analysis was used to evaluate individual and combined associations of hyperhomocysteinemia and hypertension with the risks of incident CVD events and all-cause death. RESULTS Over a median of 4.84-year follow-up, hyperhomocysteinemia was independently associated with incident CVD events and all-cause death. The hazard ratios (HRs) were 1.45 (95% CI: 1.01−2.08) for incident CVD events and 1.55 (95% CI: 1.04−2.30) for all-cause death. After adjustment for confounding factors, H-type hypertension had the highest HRs for incident CVD events and all-cause death. The fully adjusted HRs were 2.44 for incident CVD events (95% CI: 1.28−4.65), 2.07 for stroke events (95% CI: 1.01−4.29), 8.33 for coronary events (95% CI: 1.10−63.11), and 2.31 for all-cause death (95% CI: 1.15−4.62). CONCLUSIONS Hyperhomocysteinemia was an independent risk factor, and when accompanied by hypertension, it contributed to incident CVD events and all-cause death in the Chinese elderly population without a history of CVD.

Lifetimes of the 2 $$_1^{+}$$ , 4 $$_1^{+}$$ , 7 $$_2^{-}$$ , 10 $$_2^{+}$$ , 12 $$_2^{+}$$ , and 14 $$_1^{+}$$ states in $$^{138}$$ Nd populated via the $$^{123}$$ Sb( $$^{19}$$ F, 4n) $$^{138}$$ Nd fusion–evaporation reaction were measured with the recoil distance Doppler shift technique in combination with the differential decay curve method. The $$B(E2; 2_{1}^{+} \rightarrow 0_{1}^{+})$$ value fit well with the systematic trend in the Nd isotope chain and Grodzins rule, which proved that $$^{138}$$ Nd is a transitional nucleus.

The LaBr3(Ce) detector has attracted much attention in recent years because of its superior characteristics compared with other scintillating materials in terms of resolution and efficiency. However, it has a relatively high intrinsic background radiation because of the naturally occurring radioisotopes in lanthanum, actinium, and their daughter nuclei. This limits its applications in low-counting rate experiments. In this study, we identified the radioactive isotopes in the $$\phi 3''\times 3''$$ Saint-Gobain B380 detector by a coincidence measurement using a Clover detector in a low-background shielding system. Moreover, we carried out a Geant4 simulation of the experimental spectra to evaluate the activities of the main internal radiation components. The total activity of the background radiation of B380 is determined to be 1.523 (34) Bq/cm3. The main sources include 138La at 1.428 (34) Bq/cm3, 207Tl at 0.0135 (13) Bq/cm3, 211Bi at 0.0136 (15) Bq/cm3, 215Po at 0.0135 (3) Bq/cm3, 219Rn at 0.0125 (12) Bq/cm3, 223Fr at 0.0019 (11) Bq/cm3, 223Ra at 0.0127 (10) Bq/cm3, 227Th at 0.0158 (22) Bq/cm3, and 227Ac at 0.0135 (13) Bq/cm3. Of these, the activities of 207Tl, 211Po, 215Po, 223Fr, and 227Ac are deduced for the first time from the secular equilibrium established in the decay chain of 227Ac.

The GEM-based neutron detector has flourished in the past decade. However, most of the GEM-based neutron detectors operate in the flow-gas mode, and the long-term performances of the detectors may be unstable due to the dynamic changes of atmospheric pressure and ambient temperature. In this work, a sealed ceramic GEM-based neutron detector with 100 mm × 100 mm sensitive area was developed at China Spallation Neutron Source (CSNS). Various characteristics of the detector were determined. These included the plateau curve, neutron beam profile, neutron wavelength spectrum, spatial resolution (FWHM: 2.77 ± 0.01(stat) mm), two-dimensional (2D) imaging ability, neutron detection efficiency and long-term counting rate instability (Relative Standard Deviation (RSD): 0.80%). The results revealed the good performance of the detector in sealed mode. Furthermore, the detector can be used for measurements of the direct neutron beam at CSNS.

Excited states in the odd-A nucleus 71Ga have been studied via the 70Zn(7Li, )71Ga fusion-evaporation reaction with incident beam energies of 30 and 35 MeV. The level scheme is established up to spin = (29/2+) and an excitation energy 6.6 MeV. A previously known sequence built on the 9/2+ state is extended as a novel rotational band originating from the alignment. Furthermore, a negative-parity sequence is also reported. The observed energy levels of 71Ga have been interpreted in the framework of the nuclear shell model (SM).

The heavy ion fusion–evaporation reaction study for the high-spin spectroscopy of 75As has been performed via the reaction channel 70Zn(9Be, 1p3n)75As at a beam energy of 42 MeV. The collective structure especially a dipole band in 75As is established for the first time. The properties of this dipole band are investigated in terms of the self-consistent tilted axis cranking covariant density functional theory. Based on the theoretical description and the examination of the angular momentum components, this dipole band can be interpreted as a novel stapler band, where the valence neutrons in ( 1 g 9 / 2 ) orbital rather than the collective core are responsible for the closing of the stapler of angular momentum.

The lifetime of the state in Cd populated via the Zr ( O, 4n) Cd reaction has been measured with the Recoil Distance Doppler Shift technique in combination with the Differential Decay Curve Method. By subtracting the contamination in the data, the mean lifetime of the =2 633 keV state was determined as 9.9 (12) ps. The value calculated in this study is in good agreement with the experimental systematics and was compared to the shell model calculations.

High-spin states of 109Ag have been studied using the 7Li + 110Pd reaction at a beam energy of 46 MeV. A new negative-parity band decaying to the ground-state band by several new linking transitions is established. Meanwhile, seven new E2 crossover transitions of this band are observed, thereby confirming the spin-parity assignment and ordering of the dipole transitions above the Iπ = 19/2- level. A low energy γ-ray transition of 88 keV is found and placed at the bottom of the negative-parity band, and thus the Iπ = 17/2- level is tentatively assigned as the lowest observed state of this band. Experimental excitation energies and total angular momenta of the negative-parity band are compared with the predictions of self-consistent titled axis cranking relativistic mean-field theory with a three-quasiparticle configuration of πg9/2 -1 νh11/2(g7/2/d5/2)-1. Based on the theoretical description and the analyses of the angular momentum coupling, this negative-parity dipole band is suggested as a ``stapler'' band. By investigating the angular momentum components, it is found that the valence nucleons in the low-j orbitals play an active role in the ``stapler'' mechanism.

A new development of indirect gating case in the differential decay curve method used for lifetime measurement has been introduced. The gate region was extended from partial shifted peak to both shifted and unshifted components. The statistics of flight and stop peaks in gating spectra was improved obviously. The reliability of this change has been tested by reanalysing the lifetime of $$2^{+}$$ state in $$^{134} \hbox {Ce}$$ . The result of 32.2(33) ps was fit well with the previous published values within the experimental uncertainty. The developed method was also used to analyse the lifetime of $$2_1^{+}$$ state in $$^{138} \hbox {Nd}$$ .

Objective To retrospectively analyze the data of 72 patients with tuberculous meningitis (TBM) combined with cranial nerve palsy, to explore the incidence, clinical features, CSF assay changes and outcome in patients with TBM. Patients and methods A total of 72 patients were diagnosed as TBM with cranial nerve palsy. The gender, age, clinical manifestations, CSF examinations, cerebral magnetic resonance imaging (MRI) enhancement scan were collected. All these patients had completed at least 2 months of follow up after anti-tuberculous treatment. Results This study retrospectively evaluated 486 patients; include 254 (52.3%) men and 232 (47.7%) women. The mean age was 35.2 ± 17.0 years. 72 patients (14.8%) were diagnosed as TBM with cranial nerve palsy. Among them, 38 cases (52.8%) had optic nerve palsy (the 2nd nerve), 41 cases (56.9%) had oculomotor nerve palsy (the 3rd nerve), 3 cases (4.2%) had abducens nerve palsy (the 6th nerve), and 10 cases (13.9%) had auditory nerve palsy (the 8th nerve). 16 patients (22.2%) had two groups of cranial nerve involvement (oculomotor nerve and optic nerve in 10 cases, optic nerve and auditory nerve in 5 cases, and optic nerve and abducens nerve in 1 case). Two patients (2.8%) had three groups of cranial nerve involvement (oculomotor nerve, optic nerve and abducens nerve). CSF MTB was detected by acid fast bacilli (no patient was positive), MTB DNA detection by multiplex polymerase chain reaction (PCR) (3 patients were positive) and MTB cultures (2 patients were positive). There was no significant difference of CSF cells and biochemistry investigations between the patients with or without cranial nerve palsy. Magnetic resonance imaging (MRI) enhancement scan were done in 66 (91.7%) patients after admission. It was abnormal in 57 (86.3%) patients. 15 cases (26.3%) had meningeral enhancement, 25 cases (43.9%) had tuberculoma, 11 cases (19.3%) had hydrocephalus and 6 cases (10.5%) with infarct. All patients were followed up after 2 months of anti-tuberculous treatment. 70 patients (97.2%, 70/72) with the cranial nerve palsy were fully recovered without obvious sequel. Conclusion The complications of cranial nerve palsy in TBM patients are not uncommon, and the rate of misdiagnosis is high, which makes them vulnerable to emergencies such as disturbance of consciousness. Effective anti-tuberculous treatment can restore most cranial nerve palsy.

Based on the principle of magnetic suspension driven knitting needles, a magnetic suspension driven knitting model is established. This model is compared with the traditional knitting machine, the motion control scheme of the magnetic suspension driven knitting needle is established, the axial motion of the knitting needles in the knitting needle weaving is analyzed, the movement trajectory of the knitting needle in a single period is obtained, and a control system is designed to realize the trajectory of the knitting needle. The results show that the control system can realize the trajectory of knitting needle well.

According to the principle of magnetic needle driven, through analysis and experimental research on early discovery theory of induction magnetic field distribution, magnetic density is directly related to the size of the driving coil profile and magnetic size with coil profile changes. According to the properties of magnetic drive principle and magnetic source, the intrinsic link between the certification of electromagnetic coil and permanent magnet needle contour change force theoretically, provide reliable theoretical basis for magnetic source driver for driving magnetic needle mechanism. By establishing the theoretical model of magnetic force and combining Monte Carlo method, genetic algorithm is used to optimize the shape of driving coil, and the feasibility of the optimized structure is verified by Maxwell simulation. The results show that a smooth F-z curve can be constructed by changing the contour shape of the driving coil, and the optimized driving structure is obtained, which provides a theoretical basis for the verification of the later experimental system.

A miniature winding machine was designed and made for winding special-shaped coil used for driving knitting needle used in the test prototype of electromagnetic levitation circular knitting machine. The machine adopts USB1020-Altai independent four axis motion control card and 42 stepper motor as its hardware drive system, and at the same time, through the Qt Creator interface program based on Windows platform as its control system. The using shows that the winding machine has the advantages of accurate wiring, high winding quality and wide application range. The main technical indexes, structure, working principle and control system of winding machine are introduced.

Due to the complexity of cataclastic rock structure, joint development, cataclastic rock bolting is a difficult problem to solve. According to roadway engineering properties and deformation characteristics of liu qiao one ore two level six mining area-380 transport cross section, choose one supporting form, adopt the method of numerical simulation to analysis its supporting effect, to ensure the stability of surrounding rock and the safe running of the roadway.

The aim of this study was to evaluate the diagnostic value of the cerebrospinal fluid (CSF) T-SPOT.TB test for the diagnosis of TB meningitis (TBM). A retrospective analysis of 96 patients with manifested meningitis was conducted; T-SPOT.TB test was performed for diagnosing TBM to determine the diagnostic sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). A receiver operating characteristic (ROC) curve was also drawn to assess the diagnostic accuracy. The sensitivity, specificity, PPV, and NPV of CSF T-SPOT.TB test were 97.8%, 78.0%, 80.3%, and 97.5%, respectively, for 52 patients (54.2%) of the 96 enrolled patients. The area under the curve (AUC) was 0.910, and the sensitivities of CSF T-SPOT.TB for patients with stages I, II, and III of TBM were 96.7%, 97.2%, and 98.9%, respectively. CSF T-SPOT.TB test is a rapid and accurate diagnostic method with higher sensitivity and specificity for diagnosing TBM.

In order to improve the quality of Perccottus gleniis myofibril protein gel, the index of hardness and springiness, the single factor experiment and response surface methodology were used to optimize the conditions of heating temperature, PH value and heating time in the process. Results showed that the optimal conditions for strengthening gelation properties of P. glenii myofibril were 84℃, pH6.5, 49 min, at the same time, the hardness and springiness values were 0.856 and 76.825, in this condition Proven test to obtain hardness and elasticity were 76.798 and 0.857, which were close to the predicted value. Results showed that the model could can be uesd in the well on process optimization.

In order to improve the quality of traditional cooked meat products, the raw meat materials were processed through the low temperature curing methods. The sensory score was taken as a criteria, combining single factor and orthogonal test, the added amount of salt, sugar, monosodium glutamate (MSG), soy sauce, and cooking wine were optimized. The results showed that the optimal formula was salt 1.5%, sugar 3%, monosodium glutamate 0.5%, soy sauce 1.5% and cooking wine 2.5%. The sample had the highest score according to these conditions.

Based on the needle selection principle and requirements for hybrid magnetic type of driving knitting needles, this paper puts forward the mechanical model for the knitting needles of magnetic suspension drive mode. This paper analyzes the force model of the knitting needle by establishing the relationship between the magnetic force and the air gap. It also researches stress and strain for the knitting needle by using the finite element method. All these results will provide guidance for the optimal design of the knitting needle and parameters design of the key components like the needle cylinder and so on, at the same time these results will also provide a theoretical basis for the study of coupling mechanism for the knitting needle.

This paper takes the No. 1 ore body of Jinchuan 3rd mining area as an example, obtains the corresponding relation of surrounding rock quality evaluation index and spatial location.Through RMR rock classification method , using Rockware modeling system and limited geological informations, the statistical analysis of RMR and RQD showed that the rock of No. 1 ore body belongs to III~V type. Its rock mass is between normal to unstable. Through Rockware modeling system, we established the 3D rock properties model of UCS, RQD and RMR, and found that in the 5 to 6 rows of east hanging wall exists rock not conducive to the block caving method which belongs to the type of V. Finally, Statistical analysis was made based on the numerical model of strata. We find that , basically ,the rock block has good cavability because it belongs to the IV type of rock masses. However when design blocks and manage drawing, we must pay particular attention to the III type of rock, which is of moderate stability, and the V type of rock, which is less stable. All of these make a useful exploration for the research of key technology in the field of the interior of the earth.

Excited states of the odd–odd nucleus 74 As have been investigated via heavy ion fusion evaporation reaction Zn 70 ( Li 7 , 3 n ) As 74 at beam energy of 30 MeV. The properties of the positive- and the negative- parity bands can be interpreted in terms of the Cranked Nilsson–Strutinsky (CNS) model calculations which show that the observed bands are built on the triaxial deformed shape. The inversion of the favored and unfavored signature branches observed in the positive-parity bands presents at high spins rather than normal signature inversion occurs at low spins. This phenomenon may be explained as the origin of unpaired band crossing in a highly rotating triaxial nucleus.

Using the fuzzy evaluation theory,through the establishment of the safety of large cross construction of fuzzy evaluation model, using AHP to evaluate the safety of large cross construction, the comprehensive safety evaluation,and points out its advantages and disadvantages. The fuzzy control is conducive to the management level of large-scale cross constructionsafety improve, to the great guidance for other types ofcity rail traffic.

During the construction of concrete structure, laying controlled permeability formwork within the traditional formwork can effectively improve the durability of concrete for marine structures and prolong the working life of concrete structures. This paper discusses the working mechanism of controlled permeability formwork, introduces its development history and research status, summarizes the construction process and matters needing attention of controlled permeability formwork, and puts forward the problems remaining to be solved at present.

Monitoring and controlling of vertical construction for main arch ribs is most important for concrete-filled steel tube (CFST) arch bridges due to high risk. Controlling the difference of elevation between the two main arch ribs has direct influence on the mechanical behavior of lateral brace, towers and temporary hinges at arch abutments of main piers. Therefore, transverse synchronization control is the main priority in vertical rotating construction phase. Taking a half-through CFST arch bridge in Shijiazhuang City as an example, this paper make a study of transverse synchronization control of the two main arch ribs during vertical rotation. The finite element method (FEM) software-Midas is employed to simulate the main arch ribs in rotation construction phase, and maximum value of the difference of elevation between the two main arch ribs is obtained to offer reference and basis of vertical rotation construction of this bridge.

To discuss the relationship between tongue manifestation and the degree of neurological impairment in the patients with acute cerebral infarction.Two hundred patients with first unilateral cerebral infarction were recruited. The relationship between different tongue manifestation and National Institute of Health Stroke Scale (NIHSS) were analyzed.NIHSS scores in the patients from different tongue color groups were analyzed and further analysis demonstrated that the NIHSS score was higher in the patients with red or bluish-purple tongue than that of those with the pink (P0.01). On tongue fur, the NIHSS score in the patients with thick fur was higher than that of those with the thin (P=0.003). NIHSS score in patients with slippery, moist or dry fur was significant different (P=0.003), Further analysis demonstrated that the NIHSS score was higher in the patients with dry fur than that of those with moist fur, and had statistical significance (P=0.01). The NIHSS score was higher in patients from greasy fur group than that of the non-greasy (P=0.002). There was significant difference of NHISS score in the patients with different fur color (P=0.000), and further analysis demonstrated that the NHISS score in white-yellow, yellow fur group were higher than that of the white (P=0.06 or 0.000).The changes of tongue manifestation might be associated with the degree of neurological impairment in the patients with acute cerebral infarction.

In order to realize remote measure, remote communication and remote control function in wind-solar hybrid street light operation management system, a kind of management system based on ZigBee technology is introduced by this paper. This design is used JN513x series ZigBee wireless communication micro controller to build hardware platform, and is used Modbus protocol to manage all light controllers. The data exchange between each wireless module and the gathering terminal is completed by ZigBee wireless network. The data exchange between each gathering terminal and monitoring center is completed by GPRS/CDMA network. This design has applied to Hunan new energy road lighting project with stability and excellent performance.