AN EVALUATION Research Articles

Study of the Ångström turbidity over Romanian Black Sea coast

The atmospheric turbidity has an important role in the climate changes studies and solar radiation modelling. A three years AERONET data set (2010–2012) was used to study the variation of the aerosol optical properties and Ångström turbidity at Eforie Nord (Romania), on the Black Sea coast. The study emphasizes a similar seasonal variation for aerosol optical depth (AOD) and turbidity (β), consisting of maximum averaged value in spring and summer and minimum averaged value in winter. The Ångström exponent (AE) reached the maximum average in summer and the minimum in autumn. The results indicate the main contribution of the fine particles to the local load of atmosphere and low turbidity. The dependence of turbidity on the Ångström exponent highlights that turbidity can be computed based on a constant value of AE = 1.3, even in the climatological conditions of the Black Sea coast. Statistical analysis shows a moderate correlation between daily values of turbidity and precipitable water (r = 0.51). The days with the highest turbidity values from the perspective of meteorological parameters and air mass trajectories were analyzed. This study shows that a significant transport of aerosol from the western and southwestern part of Europe influenced the air turbidity.

Effects of Nitrogen Levels on Growth, Yield And Nitrogen use Efficiency Of Some Newly Released Egyptian Rice Genotypes

Abstract Application of appropriate level of nitrogen fertilization is a major objective to increase nitrogen use efficiency by rice varieties. Field experiments were conducted during 2016 and 2017 growing seasons to evaluate the efficiency of varying nitrogen fertilizer rates on growth and yield parameters, along with nitrogen use efficiency of some newly released rice varieties (Sakha 108) and some promising lines GZ9399-4-1-1-3-2-2, GZ10101- 5-1-1-1 and GZ10154-3-1-1-1. Five nitrogen levels (i.e. 0, 55, 110, 165 and 220 kg N ha-1) were used. The results from both growing seasons indicated that, Sakha 108 recorded the highest grain yield while GZ10154 and GZ10101 recorded the lowest grain yields. A linear increase in grain yield was observed with continuous rate increase of nitrogen from 0 to 220 kg ha-1, while 220 kg N ha-1 treatment showed maximum grain yield followed by 165 kg N ha-1, with control as minimum. Agronomic nitrogen use efficiency (AE) for studied rice genotypes varied significantly, and ranged from 3.63 to 32.9 and from 2.72 to 34.12 kg grain yield produced per kg of nitrogen applied in 2016 and 2017 respectively. Across N levels, GZ9399 recorded the highest values of AE for the nitrogen fertilizer rate of 165 kg N ha-1 in both seasons.

Identification and evaluation of alveograph dough parameters of some bread wheat (Triticum aestivum L.) genotypes

Alveograph analysis has long been one of the important methods in determination of bread making quality of wheat genotypes. Sixty-four bread wheat genotypes were analyzed for five alveograph parameters including alveograph energy (W, 10-4 joule) (AE), dough strength (P, mm), elasticity (L, mm) index of swelling (G, cm3), alveograph configuration ratio (P/L), protein content (PC) and hardness (HRD). Genotype means of AE ranged from 155.4 x10-4 J to 444.7 x10-4 J. Ocoroni86/Pewit3 reached the highest AE value with 444.7 x10-4 J. Pamukova-97 was in the same statistical group with 426.5 x10-4 J AE value. Genotype means of P ranged from 50.0 mm to 162.9 mm. Aköz/Galil had the highest P value with162.9 mm. Genotype means of L ranged from 40.6 mm to 180.8 mm. Sunco/Pastor had the highest L value with 180.8 mm. Genotype means of G ranged from 14.35 cm3 to 29.98 cm3. Sunco/Pastor had the highest G value with 29.98 cm3. Genotype means of P/L ranged from 0.29 to 3.77. Aköz/Galil had the highest P/L rate with 3.77. The genotype means of protein content (PC) ranged from 10.6% to 14.2%. Genotypes with 13% or more PC in this study were Pamukova-97/Arostor, Pewit-3, Aldane and Ocoroni-86/Pewit-3. The mean HRD values of the genotypes ranged from 46.5% to 68.0. The sisters of Adana-99/Sultan-95 (Genotypes 16 and 17) and Pamukova-97/Sönmez were the hardest grained genotypes in the study. The produced information will be useful for bread wheat breeding programs attempting to improve high quality bread wheat cultivars.

AN EVALUATION OF THE INFLUENCE OF HEAT TREATMENT ON THE PRESERVATIVE RETENTION IN ASH WOOD (FRAXINUS EXCELSIOR L.)

AN EVALUATION OF THE INFLUENCE OF HEAT TREATMENT ON THE PRESERVATIVE RETENTION IN ASH WOOD (FRAXINUS EXCELSIOR L.)

Evaluating the influences of the cutting parameters on the surface roughness and form errors in 4-axis milling of thin-walled free-form parts of AISI H13 steel

The machining of complex surfaces such as those present in rotors, impeller blades, thin-walled parts among other engineering components has been commonly carried out in multi-axis CNC machines programmed by CAD/CAM software. Even with a significant aid of the CAD/CAM systems, the users are responsible for defining an optimal set of cutting parameters, relying on their practical knowledge. This task gets harder when thin-walled parts have to be milled, because besides the problems caused by the limit of rigidity of the cutting tool, there is also the limit of rigidity of the thin-walled parts. Few works can be found on current literature concerning this issue. Then, the current work aims to analyse the influences of the cutting parameters: feed per tooth (fz); radial depth of cut (ae); and cutting direction (up and down milling), on the form errors and surface roughness of thin-walled parts manufactured by 4-axis milling using AISI H13 steel. The results show that the cutting direction (up/down milling) was the major variable to affect the form errors. Down milling left more than 0.2 mm of material on the machined part. On the opposite, up milling removes up to 0.2 mm more material than it should be. ANOVA shows that the influence of the fz on the form error is slightly higher than ae influence. In extreme cases, it can be about 1.5 times more influent than ae. Down milling and the highest values of ae and fz tested proved to be a good set of cutting conditions for milling free-form thin-walled parts, because with these conditions a good surface roughness, a positive form error and higher productivity were obtained.

FOREST ACCOUNTING AT FAIR VALUE: AN EVALUATION OF STRENGTHS AND POSSIBILITIES TO MINIMISE SHORTCOMINGS

The accounting standards provide options for different accounting methods to be deployed in accounting of certain assets. However, in other cases, only one of the specified methods should be applied. The forest (stands), the main resource of forestry enterprises, is also attributed to this category of assets, which, according to the standard IAS 41 Agriculture, should be accounted for only at fair value. The aim of the paper is to identify the strengths and shortcomings of applying the concept of fair value to forest financial accounting and to evaluate the possibilities to minimise the disadvantages. The study examines the scholarly literature and deploys the theoretical methods of comparative analysis, critical evaluation, systematisation, generalisation. The empirical research involves the document content analysis, expert assessment methods.The paper examines the issues of applying the fair value concept to forestry accounting: forest valuation at fair value in financial statements reflects the forest biological transformation and the impact of market price changes on the value of the forest. However, the main disadvantage of this method is the fact that the forest often does not have an active market with quoted prices. Thus, its fair value is determined using different valuation methods, often based on subjective assumptions resulting in financial information which can be unreliable and difficult to verify. Furthermore, the profit and loss accounts including the recognition of the change in the fair value of the forest to be sold in the forthcoming decades are not only doubtful, but may also lead to false interpretations of the financial indicators and contradict to the prudence principle. Based on the conclusions of expert evaluation of certain aspects of forest accounting at fair value, the research study offers a modified method of forest accounting at fair value which facilitates minimisation of the shortcomings.

Evaluation of the Microhaplotypes panel for DNA mixture analyses

The identification of a suspect in a DNA mixture typed with the standard short tandem repeat polymorphism (STR) kits has faced challenges. Several improved methods or technologies have been introduced to address this issue. However, some complex situations in the process remain elusive. In the present study, we presented a panel of 26 tiny microhaplotypes, each generating a relatively high (>3.0) effective number of alleles (Ae) and possessing low (<50 bp) sequence lengths. The average Ae and heterozygosity values among the 9 populations of 26 microhaps were in ranges from 2.60 to 4.54 and 0.59 to 0.96, respectively. Power of discrimination and power of exclusion values were ranged from 0.49 to 0.87 and 0.29 to 0.94, respectively. Significant positive correlations have been found between Ae values and heterozygosity (r = 0.43, p = 0.02) or power of discrimination values (r = 0.55, p = 0.003), respectively. The cumulative probability of detecting a mixture of two unrelated individuals could reach 0.9999998 when using a panel of 26 microhaps with Ae = 3. We further tested the panel by using massively parallel sequencing, and 14 out of 26 microhaps were successfully genotyped in a single multiplex system. 60 unrelated Chinese Han individuals and 2 artificially prepared samples mixed by two unrelated contributors (in duplicate, ie. 4 mixtures) were sequenced. Approximately 32.14% of the 14 loci presented three or four alleles in the two mixtures. The likelihood ratio values to cognizance the mixtures’ contributor were in a range from 1.95 × 106 to 1.10 × 107. The results demonstrated that the present panel could offer a valuable complementary tool in forensic applications.

Impact of intraoperative mechanical ventilation on left ventricular lead function in cardiac resynchronization therapy.

Intraoperative controlled mechanical ventilation (CMV) changes the intrathoracic geometry and may impact postoperative left ventricular (LV) lead function after CRT implantation. This multicenter study investigates the effect of intraoperative ventilation setting (spontaneous breathing[SB] vs CMV) on postoperative LV lead function taking into account patients' body mass index (BMI). CRT implantation was performed at two centers during SB in 92 and during CMV in 73 patients. Follow-up was carried out after 3 ± 5 and 36 ± 53 days. Functional lead parameters (FLP; pacing threshold and impedance), postoperative adverse events (A; phrenic nerve stimulation [PNS] and lead malfunction), and patients' BMI were assessed. Delta values of FLP between baseline and follow-up visits were analyzed applying an analysis of covariance model to detect subclinical alterations in LV lead function. AE occurred in a total of 36 (21%) patients. PNS was observed in 26 (15%) patients and LV lead repositioning due to malfunction was necessary in 10 (6%) patients. Both AE and FLP delta values between baseline and follow-up were not associated with intraoperative ventilation settings nor the patients' BMI. This study demonstrates that there is no impact of the intraoperative ventilation setting (SB vs CMV) on postoperative FLP or the occurrence of AE. This is also the case taking into account the BMI. With respect to these findings both approaches-sedation only or general anaesthesia including CMV-can be safely implemented during CRT implantation.

AN EVALUATION OF CAUSE-RELATED MARKETING AND A SCALE DEVELOPMENT APPLICATION

This study was conducted to develop a consumer driven scale for factors which have an effect on the tendency to participate in cause-related marketing campaigns. After detailed analysis, a scale was developed with 10 dimensions. Scale assessment was done based on a sample (n= 451) which was retained by convenience sampling methodology. The analysis process is as follows: Data analysis and normal distribution analysis for sample, explanatory factor analysis, reliability and validity analysis for explanatory factor analysis, confirmatory factor analysis, validity and reliability analysis for confirmatory factor analysis, and structural equation modeling. According to the research, scale which was developed contains factors as follows: brand cause fit, masculinity / femininity, uncertainty avoidance, willingness to help others, individualism, cause familiarity, brand image, brand familiarity, and willingness to participate in campaigns. This study aims to be a base for future research related to the factors which were developed.

Ground-Based Remote Sensing of Aerosol Properties over a Coastal Megacity of Pakistan

Atmospheric aerosols are considered to be an important constituent of Earth’s atmosphere because of their climatic, environmental, and health effects. Therefore, while studying the global climate change, investigation of aerosol concentrations and properties is essential both at local and regional levels. In this paper, we have used relatively long-term Aerosol Robotic Network (AERONET) data during September 2006–August 2014 to analyze aerosol properties such as aerosol optical depth at 500 nm (AOD), Ångström exponent (440–870 nm) (AE), refractive index (RI), and asymmetry parameter over Karachi, a coastal megacity of Pakistan. The average annual values of AOD and AE were found to be 0.48 ± 0.20 and 0.59 ± 0.29, respectively. The peak (0.88 ± 0.31) AOD was recorded in July with corresponding AE of 0.30 ± 0.22 representing reasonably higher concentration of coarse size particles over Karachi. The cluster analysis using the scatter plot between absorption AE and extinction AE revealed that desert dust prevailed in the atmosphere of Karachi in spring and summer, while biomass burning aerosols dominate in autumn and winter. The peak values of volume concentrations of coarse and fine-mode particulate matter were found in summer and autumn, respectively. Also, we found significant growing trend in single-scattering albedo with wavelength, indicating the domination of dust particles during summer and spring. The peak value of the real part of the RI was observed in spring (1.53) and modest in winter (1.50). On the contrary, the peak value of the imaginary part of the RI was observed to be constantly elevated in winter and lesser in spring.

Contrasting aerosol optical and radiative properties between dust and urban haze episodes in megacities of Pakistan

Satellite and ground based remote sensors provide vital information about aerosol optical and radiative properties. Analysis of aerosol optical and radiative properties during heavy aerosol loading events in Pakistan are limited and, therefore, require in-depth examination. This work examines aerosol properties and radiative forcing during Dust Episodes (DE) and Haze Episodes (HE) between 2010 and 2014 over mega cities of Pakistan (Karachi and Lahore). Episodes having the daily averaged values of Aerosol Optical Depth (AOD) exceeding 1 were selected. DE were associated with high AOD and low Ångström Exponent (AE) over Karachi and Lahore while high AOD and high AE values were associated with HE over Lahore. Aerosol volume size distributions (AVSD) exhibited a bimodal lognormal distribution with a noticeable coarse mode peak at a radius of 2.24 μm during DE, whereas a fine mode peak was prominent at a radius 0.25 μm during HE. The results reveal distinct differences between HE and DE for spectral profiles of several parameters including Single Scattering Albedo (SSA), ASYmmetry parameter (ASY), and the real and imaginary components of refractive index (RRI and IRI). The AOD-AE correlation revealed that dust was the dominant aerosol type during DE and that biomass burning and urban/industrial aerosol types were pronounced during HE. Aerosol radiative forcing (ARF) was estimated using the Santa Barbra DISORT Atmospheric Radiative Transfer (SBDART) model. Calculations revealed a negative ARF at the Top Of the Atmosphere (ARFTOA) and at the Bottom Of the Atmosphere (ARFBOA), with positive ARF within the Atmosphere (ARFATM) during both DE and HE over Karachi and Lahore. Furthermore, estimations of ARFATM by SBDART were shown to be in good agreement with values derived from AERONET data for DE and HE over Karachi and Lahore.

Ultraviolet and near-infrared luminescence of LaBO3:Ce3+,Yb3+

Ce3+ or Yb3+ singly doped LaBO3 and Ce3+-Yb3+ co-doped LaBO3 were prepared by conventional solid state reactions at 1100 °C and their photoluminescence (PL) properties were investigated. The emission spectrum of LaBO3:Ce3+,Yb3+ contains both the Ce3+ ultraviolet (UV) emissions (355 nm and 380 nm) and the Yb3+ near infrared (NIR) emission (975 nm) when excited by the UV light at 270 nm. By using the data of the Ce3+ decay curves and the PL intensities of both Ce3+ and Yb3+, the energy transfer efficiency (η) from Ce3+ to Yb3+, the actual energy transfer efficiency (AE) and the quantum efficiency (Q) of the Yb3+ emission were calculated. In the Ce3+-Yb3+ co-doped LaBO3, Ce3+ can transfer its absorbed energy to Yb3+ efficiently (η can be over 60%), and Yb3+ shows the Q value over 50% when it accepts the energy from Ce3+, which results in the low AE value ∼30%. The energy transfer process from Ce3+ to Yb3+ may be understood by the charge transfer mechanism: Ce3+ + Yb3+ ↔ Ce4+ + Yb2+. Particularly the Ce3+-Yb3+ co-doped LaBO3 phosphor gives the emissions mainly in the UV range and the NIR range with a portion of visible emissions in eye-insensitive range. This unique property may be suitable for applications in anti-counterfeiting techniques and public security affairs.

Substorm activity during the main phase of magnetic storms induced by the CIR and ICME events

In this work, the relation of high-latitude indices of geomagnetic activity (AE, Kp) with the rate of storm development and a solar wind electric field during the main phase of magnetic storm induced by the CIR and ICME events is investigated. 72 magnetic storms induced by CIR and ICME events have been selected. It is shown that for the CIR and ICME events the increase of average value of the Kp index (Kpaver) is observed with the growth of rate of storm development. The value of Kpaver index correlates with the magnitude of minimum value of Dst index (|Dstmin|) only for the ICME events. The analysis of average values of AE and Kp indices during the main phase of magnetic storm depending on the SW electric field has shown that for the CIR events, unlike the ICME events, the value of AEaver increases with the growth of average value of the electric field (Eswaver). The value of Kpaver correlates with the Eswaver only for the ICME events. The relation between geomagnetic indices and the maximum value of SW electric field (Eswmax) is weak. However, for the ICME events Kpaver correlates with Eswmax.

Adulticidal, larvicidal, pupicidal and oviposition deterrent activities of essential oil from Zanthoxylum limonella Alston (Rutaceae) against Aedes aegypti (L.) and Culex quinquefasciatus (Say)

ObjectiveTo evaluate adulticidal, larvicidal and oviposition deterrent response of the essential oil from dried Zanthoxylum limonella (Z. limonella) fruit against Aedes aegypti (Ae. aegypti) and Culex quinquefasciatus (Cx. quinquefasciatus). MethodsZ. limonella oil was tested by biological assays at 1%, 5% and 10% concentrations in ethanol. Adulticidal efficacy was tested against the 2–3 day old adult females. Larvicidal activity was tested against immature stage of mosquitoes. Oviposition deterrence of the oil was evaluated on gravid females. ResultsThe adult mortality was observed after 24 h with the LC50 of 6.0% for Ae. aegypti, and 5.7% for Cx. quinquefasciatus. Larvicidal bioassay was carried out with the 10% Z. limonella oil against immature stages of Ae. aegypti and Cx. quinquefasciatus, which caused 100% mortality after 12 h and 24 h. In the larvicidal experiment, Z. limonella showed effective result at 1%, 5% and 10% concentrations with the values of LT50 Ae. aegypti = 9.78, 5.61, 0.24 h for larvae and LT50 = 64.08, 21.23 h for pupae; Cx. quinquefasciatus had LT50 = 28.46, 20.25, 1.01 h for larvae and LT50 = 67.52, 27.96, 4.11 h for pupae, respectively. Oviposition deterrence of the oil was evaluated on gravid females. In the study, 10% Z. limonella showed 100% repellency for Ae. aegypti and 99.53% for Cx. quinquefasciatus. Likewise, oviposition activity indexes of these oil concentrations were all negative values ranging from–0.89 to −1.00 for Ae. aegypti and–0.64 to–0.99 for Cx. quinquefasciatus. The oviposition activity indexes values revealed that Z. limonella oil has deterrent effect, and it caused a remarkable negative response resulting in very few eggs. ConclusionsThis result indicates that Z. limonella oil can be used as an effective adulticide, larvicide and oviposition deterrent against Ae. aegypti and Cx. quinquefasciatus.

Dissociative Photoionization of 1,4-Dioxane with Tunable VUV Synchrotron Radiation

The photoionization and photodissociation of 1,4-dioxane have been investigated with a reflectron time-of-flight photoionization mass spectrometry and a tunable vacuum ultraviolet synchrotron radiation in the energy region of 8.0–15.5 eV. Parent ion and fragment ions at m/z 88, 87, 58, 57, 45, 44, 43, 41, 31, 30, 29, 28 and 15 are detected under supersonic conditions. The ionization energy of DX as well as the appearance energies of its fragment ions C4H7O2+, C3H6O+, C3H5O+, C2H5O+, C2H4O+, C2H3O+, C3H5+, CH3O+, C2H6+, C2H5+/CHO+, C2H4+ and CH3+ was determined from their photoionization efficiency curves. The optimized structures for the neutrals, cations, transition states and intermediates related to photodissociation of DX are characterized at the B3LYP/6-31+G(d,p) level and their energies are obtained by G3B3 method. Possible dissociative channels of the DX are proposed based on comparison of experimental AE values and theoretical predicted ones. Intramolecular hydrogen migrations are found to be the dominant processes in most of the fragmentation pathways of 1,4-dioxane.

AN EVALUATION OF NEW BAMBOO FURNITURE : Through Examining the Relationship between Design and Value

AN EVALUATION OF NEW BAMBOO FURNITURE : Through Examining the Relationship between Design and Value

Statistical analysis of solar wind parameters and geomagnetic indices during HILDCAA/HILDCAA∗ occurrences between 1998 and 2007

In this paper, we investigated the interplanetary conditions during 124 less strict high-intensity, long-duration, continuous AE activity (HILDCAA∗) events between the years of 1998 and 2007. The HILDCAA∗ events were chosen by following three “traditional” criteria of high-intensity, long-duration, continuous AE activity (HILDCAA) events which are characterized with peak of AE intensities equal or greater than 1000nT; and a minimum of 2days length where AE values occur outside the main phase of geomagnetic storms. However, we include a small modification in the following criterion: “the AE values should not drop below 200nT for more than 2h at a time”. This criterion is modified by changing “2” to “4h at a time” in which the AE values should not drop below 200nT. Our results shows that the temporal distribution of HILDCAA∗ events during the solar cycle presents a pattern of double peak, where the first peak is seen around the rising phase and the maximum of the sunspot cycle 23, with the second peak in its descending phase. This kind of temporal behavior is also observed in HILDCAAs in earlier studies. After the definition of HILDCAA∗ events, a comparison of solar wind parameters and geomagnetic indices among HILDCAAs, HILDCAAs∗, and the background condition is performed using a statistical approach. It is shown that interplanetary causes of HILDCAAs and HILDCAA∗s are the same. The advantage of the usage of HILDCAA∗s is that the number of events available for study will be ∼3 times higher.

AN EVALUATION OF RELATIVE PARALLELISM OF OCCLUSAL PLANE TO ALA TRAGAL LINE IN YOUNGER AGE INDIVIDUALS.

25Apr 2017 AN EVALUATION OF RELATIVE PARALLELISM OF OCCLUSAL PLANE TO ALA TRAGAL LINE IN YOUNGER AGE INDIVIDUALS. Prashaanthi N BDS , Dhanraj. MMDS and Ashish R. Jain MDS MD ACU. VARMA Second Year, Department of Prosthodontics, Saveetha Dental College and Hospital, Chennai, India. Professor And HOD, Department of Prosthodontics, Saveetha Dental College and Hospitals, Saveetha University, Chennai, India. Reasearch Scholar, Reader, Department of Prosthodontics, Saveetha Dental College and Hospitals, Saveetha University, Chennai, India.

Differences between measured and reported volatile organic compound emissions from oil sands facilities in Alberta, Canada

Large-scale oil production from oil sands deposits in Alberta, Canada has raised concerns about environmental impacts, such as the magnitude of air pollution emissions. This paper reports compound emission rates (E) for 69-89 nonbiogenic volatile organic compounds (VOCs) for each of four surface mining facilities, determined with a top-down approach using aircraft measurements in the summer of 2013. The aggregate emission rate (aE) of the nonbiogenic VOCs ranged from 50 ± 14 to 70 ± 22 t/d depending on the facility. In comparison, equivalent VOC emission rates reported to the Canadian National Pollutant Release Inventory (NPRI) using accepted estimation methods were lower than the aE values by factors of 2.0 ± 0.6, 3.1 ± 1.1, 4.5 ± 1.5, and 4.1 ± 1.6 for the four facilities, indicating underestimation in the reported VOC emissions. For 11 of the combined 93 VOC species reported by all four facilities, the reported emission rate and E were similar; but for the other 82 species, the reported emission rate was lower than E The median ratio of E to that reported for all species by a facility ranged from 4.5 to 375 depending on the facility. Moreover, between 9 and 53 VOCs, for which there are existing reporting requirements to the NPRI, were not included in the facility emission reports. The comparisons between the emission reports and measurement-based emission rates indicate that improvements to VOC emission estimation methods would enhance the accuracy and completeness of emission estimates and their applicability to environmental impact assessments of oil sands developments.

Effect of Spindle Parameters of Woodworking Band Saw on the AE Value of Crack Band Saw Blade in Compound Material Processing (1)

Taking the MJ3210A motion band saw as the research object, the AE value of the band saw blade vibration was obtained by analyzing the VIBSYS vibration signal acquisition and analysis software system in Beijing, and the change of the AE value of the band saw and the crack was found out. The experimental results show that in the MJ3210A sports car sawing machine, the band saw blade with width of 130 mm is used, and the AE value of the cracked band saw blade is well in the high band saw blade AE value. Under the best working condition of the band saw, the band saw blade AE If the value exceeds 104.7 dB (A) above, it means that the band saw blade has at least one crack length greater than 1.38 mm for the crack defect and the need to replace the band saw blade in time. Different species with saw blade of the AE value is different, white pine wood minimum, the largest oak wood; according to a variety of wood processing AE instrument value to determine the band saw blade crack to the situation; so as to fully rational use of band saw blade, The failure and the degree of development to find a new method.